From 14262001badfb856c5ff56faf4f2727de3b43c84 Mon Sep 17 00:00:00 2001
From: Ivan Magda <imagda15@gmail.com>
Date: Tue, 24 Jul 2018 13:21:55 +0300
Subject: [PATCH 01/14] Update launch screen

Add Stepik logo.
---
 .../logo.imageset/Contents.json               |  21 +++++++++
 .../Assets.xcassets/logo.imageset/logo.png    | Bin 0 -> 19351 bytes
 .../Base.lproj/LaunchScreen.storyboard        |  29 ------------
 .../PresentationLayer/LaunchScreen.storyboard |  43 ++++++++++++++++++
 Stepic.xcodeproj/project.pbxproj              |  20 ++++----
 5 files changed, 72 insertions(+), 41 deletions(-)
 create mode 100644 ExamEGERussian/Resources/Assets/Assets.xcassets/logo.imageset/Contents.json
 create mode 100644 ExamEGERussian/Resources/Assets/Assets.xcassets/logo.imageset/logo.png
 delete mode 100644 ExamEGERussian/Sources/PresentationLayer/Base.lproj/LaunchScreen.storyboard
 create mode 100644 ExamEGERussian/Sources/PresentationLayer/LaunchScreen.storyboard

diff --git a/ExamEGERussian/Resources/Assets/Assets.xcassets/logo.imageset/Contents.json b/ExamEGERussian/Resources/Assets/Assets.xcassets/logo.imageset/Contents.json
new file mode 100644
index 0000000000..8463acafa9
--- /dev/null
+++ b/ExamEGERussian/Resources/Assets/Assets.xcassets/logo.imageset/Contents.json
@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "logo.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
\ No newline at end of file
diff --git a/ExamEGERussian/Resources/Assets/Assets.xcassets/logo.imageset/logo.png b/ExamEGERussian/Resources/Assets/Assets.xcassets/logo.imageset/logo.png
new file mode 100644
index 0000000000000000000000000000000000000000..fe9ef3cebc6f355616141ffe20855b38be32bcc4
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HcmV?d00001

diff --git a/ExamEGERussian/Sources/PresentationLayer/Base.lproj/LaunchScreen.storyboard b/ExamEGERussian/Sources/PresentationLayer/Base.lproj/LaunchScreen.storyboard
deleted file mode 100644
index d26d12be61..0000000000
--- a/ExamEGERussian/Sources/PresentationLayer/Base.lproj/LaunchScreen.storyboard
+++ /dev/null
@@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14113" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
-    <device id="retina4_0" orientation="portrait">
-        <adaptation id="fullscreen"/>
-    </device>
-    <dependencies>
-        <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14088"/>
-        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
-        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
-    </dependencies>
-    <scenes>
-        <!--View Controller-->
-        <scene sceneID="EHf-IW-A2E">
-            <objects>
-                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
-                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
-                        <rect key="frame" x="0.0" y="0.0" width="320" height="568"/>
-                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
-                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
-                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
-                    </view>
-                </viewController>
-                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
-            </objects>
-            <point key="canvasLocation" x="53" y="375"/>
-        </scene>
-    </scenes>
-</document>
diff --git a/ExamEGERussian/Sources/PresentationLayer/LaunchScreen.storyboard b/ExamEGERussian/Sources/PresentationLayer/LaunchScreen.storyboard
new file mode 100644
index 0000000000..d10f9d2e88
--- /dev/null
+++ b/ExamEGERussian/Sources/PresentationLayer/LaunchScreen.storyboard
@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14113" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <device id="retina4_7" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14088"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="logo" translatesAutoresizingMaskIntoConstraints="NO" id="Mhc-tf-zdl">
+                                <rect key="frame" x="0.0" y="20" width="375" height="647"/>
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+                        <constraints>
+                            <constraint firstItem="Mhc-tf-zdl" firstAttribute="leading" secondItem="Bcu-3y-fUS" secondAttribute="leading" id="FS6-du-twL"/>
+                            <constraint firstItem="Mhc-tf-zdl" firstAttribute="bottom" secondItem="Bcu-3y-fUS" secondAttribute="bottom" id="Mej-zU-LQT"/>
+                            <constraint firstItem="Bcu-3y-fUS" firstAttribute="trailing" secondItem="Mhc-tf-zdl" secondAttribute="trailing" id="eV2-5Y-Emf"/>
+                            <constraint firstItem="Mhc-tf-zdl" firstAttribute="top" secondItem="Bcu-3y-fUS" secondAttribute="top" id="jy0-xS-aFU"/>
+                        </constraints>
+                        <viewLayoutGuide key="safeArea" id="Bcu-3y-fUS"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="logo" width="1000" height="1000"/>
+    </resources>
+</document>
diff --git a/Stepic.xcodeproj/project.pbxproj b/Stepic.xcodeproj/project.pbxproj
index 82d5fd94f4..8b9692cda6 100644
--- a/Stepic.xcodeproj/project.pbxproj
+++ b/Stepic.xcodeproj/project.pbxproj
@@ -1881,6 +1881,7 @@
 		2C1B64E01F4C596500236804 /* Config.plist in Resources */ = {isa = PBXBuildFile; fileRef = 2C1B64CE1F4C595F00236804 /* Config.plist */; };
 		2C1B64E31F4C597F00236804 /* icon.png in Resources */ = {isa = PBXBuildFile; fileRef = 2C1B64D31F4C595F00236804 /* icon.png */; };
 		2C1B64E81F4C5A9E00236804 /* Icons.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 2C1B64E61F4C5A6D00236804 /* Icons.xcassets */; };
+		2C1BF0B02107328900EA83CA /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 2C1BF0AF2107328900EA83CA /* LaunchScreen.storyboard */; };
 		2C22042520E277B40060117A /* Skeletonable.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C22042420E277B40060117A /* Skeletonable.swift */; };
 		2C22042720E277E50060117A /* SkeletonView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C22042620E277E50060117A /* SkeletonView.swift */; };
 		2C22042B20E277F70060117A /* SkeletonViewAnimation.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C22042820E277F60060117A /* SkeletonViewAnimation.swift */; };
@@ -2018,7 +2019,6 @@
 		2C4BBF26203DC670000A4250 /* plyr.js in Resources */ = {isa = PBXBuildFile; fileRef = 2C4BBF10203DC668000A4250 /* plyr.js */; };
 		2C4DA9E91F38729500E392FA /* LocalNotificationsHelper.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C4DA9E81F38729500E392FA /* LocalNotificationsHelper.swift */; };
 		2C59F03120EB8AC900666EE0 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 2C59F03020EB8AC900666EE0 /* Assets.xcassets */; };
-		2C59F03420EB8AC900666EE0 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 2C59F03220EB8AC900666EE0 /* LaunchScreen.storyboard */; };
 		2C59F03F20EB8ACA00666EE0 /* TopicsTableViewControllerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C59F03E20EB8ACA00666EE0 /* TopicsTableViewControllerTests.swift */; };
 		2C59F04A20EB8ACA00666EE0 /* ExamEGERussianUITests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C59F04920EB8ACA00666EE0 /* ExamEGERussianUITests.swift */; };
 		2C5D51592024653B00B9D932 /* BaseCardsStepsViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C5D51582024653B00B9D932 /* BaseCardsStepsViewController.swift */; };
@@ -5564,6 +5564,7 @@
 		2C1B64D11F4C595F00236804 /* AdaptiveInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AdaptiveInfo.plist; path = Content/3124/AdaptiveInfo.plist; sourceTree = "<group>"; };
 		2C1B64D31F4C595F00236804 /* icon.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; name = icon.png; path = Content/3124/icon.png; sourceTree = "<group>"; };
 		2C1B64E61F4C5A6D00236804 /* Icons.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; name = Icons.xcassets; path = Content/3124/Icons.xcassets; sourceTree = "<group>"; };
+		2C1BF0AF2107328900EA83CA /* LaunchScreen.storyboard */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; path = LaunchScreen.storyboard; sourceTree = "<group>"; };
 		2C22042420E277B40060117A /* Skeletonable.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Skeletonable.swift; sourceTree = "<group>"; };
 		2C22042620E277E50060117A /* SkeletonView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SkeletonView.swift; sourceTree = "<group>"; };
 		2C22042820E277F60060117A /* SkeletonViewAnimation.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SkeletonViewAnimation.swift; sourceTree = "<group>"; };
@@ -5610,7 +5611,6 @@
 		2C59F02720EB8AC800666EE0 /* ExamEGERussian.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = ExamEGERussian.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		2C59F02920EB8AC800666EE0 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		2C59F03020EB8AC900666EE0 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
-		2C59F03320EB8AC900666EE0 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		2C59F03520EB8AC900666EE0 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		2C59F03A20EB8ACA00666EE0 /* ExamEGERussianTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = ExamEGERussianTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		2C59F03E20EB8ACA00666EE0 /* TopicsTableViewControllerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TopicsTableViewControllerTests.swift; sourceTree = "<group>"; };
@@ -8497,7 +8497,7 @@
 			isa = PBXGroup;
 			children = (
 				2C59F05820EB8E3700666EE0 /* UserStories */,
-				2C59F03220EB8AC900666EE0 /* LaunchScreen.storyboard */,
+				2C1BF0AF2107328900EA83CA /* LaunchScreen.storyboard */,
 			);
 			path = PresentationLayer;
 			sourceTree = "<group>";
@@ -10854,9 +10854,9 @@
 				2CFE248120ED112100AF1E3D /* Auth.plist in Resources */,
 				2CFE247C20ECF7F700AF1E3D /* Config.plist in Resources */,
 				2CE3C2BA21007D3D003AB54A /* TopicsTableViewController.xib in Resources */,
-				2C59F03420EB8AC900666EE0 /* LaunchScreen.storyboard in Resources */,
 				2C59F03120EB8AC900666EE0 /* Assets.xcassets in Resources */,
 				2CCB5A3E2100824F0091A605 /* TopicTableViewCell.xib in Resources */,
+				2C1BF0B02107328900EA83CA /* LaunchScreen.storyboard in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -12850,8 +12850,10 @@
 				"${BUILT_PRODUCTS_DIR}/lottie-ios/Lottie.framework",
 				"${BUILT_PRODUCTS_DIR}/nanopb/nanopb.framework",
 				"${BUILT_PRODUCTS_DIR}/pop/pop.framework",
+				"${BUILT_PRODUCTS_DIR}/Mockingjay/Mockingjay.framework",
 				"${BUILT_PRODUCTS_DIR}/Nimble-iOS/Nimble.framework",
 				"${BUILT_PRODUCTS_DIR}/Quick-iOS/Quick.framework",
+				"${BUILT_PRODUCTS_DIR}/URITemplate/URITemplate.framework",
 			);
 			name = "[CP] Embed Pods Frameworks";
 			outputPaths = (
@@ -12895,8 +12897,10 @@
 				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Lottie.framework",
 				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/nanopb.framework",
 				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/pop.framework",
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Mockingjay.framework",
 				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Nimble.framework",
 				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/Quick.framework",
+				"${TARGET_BUILD_DIR}/${FRAMEWORKS_FOLDER_PATH}/URITemplate.framework",
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
@@ -17296,14 +17300,6 @@
 			name = step0.html;
 			sourceTree = "<group>";
 		};
-		2C59F03220EB8AC900666EE0 /* LaunchScreen.storyboard */ = {
-			isa = PBXVariantGroup;
-			children = (
-				2C59F03320EB8AC900666EE0 /* Base */,
-			);
-			name = LaunchScreen.storyboard;
-			sourceTree = "<group>";
-		};
 		2C6640E41F30BCE60033A274 /* AchievementTableViewCell.xib */ = {
 			isa = PBXVariantGroup;
 			children = (

From e09c6f043e82e8b93a78e6f6471a1aaff29f5d07 Mon Sep 17 00:00:00 2001
From: Ivan Magda <imagda15@gmail.com>
Date: Tue, 24 Jul 2018 14:21:36 +0300
Subject: [PATCH 02/14] Initial commit for lessons scene

---
 .../RootNavigationManager.swift               | 17 +++-
 .../LessonTableViewCell.swift                 | 13 +++
 .../LessonTableViewCell.xib                   | 40 ++++++++
 .../LessonsTableViewController.swift          | 95 +++++++++++++++++++
 .../LessonsTableViewController.xib            | 26 +++++
 .../Topics/Presenter/TopicsPresenter.swift    |  0
 .../Presenter/TopicsPresenterImpl.swift       | 14 +--
 .../TopicTableViewCell.swift                  |  0
 .../TopicTableViewCell/TopicTableViewCell.xib |  0
 .../TopicsTableViewController.swift           |  0
 .../TopicsTableViewController.xib             |  0
 .../Topics/View/TopicsView.swift              |  0
 Stepic.xcodeproj/project.pbxproj              | 58 +++++++++--
 13 files changed, 244 insertions(+), 19 deletions(-)
 create mode 100644 ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonTableViewCell/LessonTableViewCell.swift
 create mode 100644 ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonTableViewCell/LessonTableViewCell.xib
 create mode 100644 ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift
 create mode 100644 ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.xib
 rename ExamEGERussian/Sources/PresentationLayer/{UserStories => }/Topics/Presenter/TopicsPresenter.swift (100%)
 rename ExamEGERussian/Sources/PresentationLayer/{UserStories => }/Topics/Presenter/TopicsPresenterImpl.swift (89%)
 rename ExamEGERussian/Sources/PresentationLayer/{UserStories => }/Topics/View/TopicTableViewCell/TopicTableViewCell.swift (100%)
 rename ExamEGERussian/Sources/PresentationLayer/{UserStories => }/Topics/View/TopicTableViewCell/TopicTableViewCell.xib (100%)
 rename ExamEGERussian/Sources/PresentationLayer/{UserStories => }/Topics/View/TopicsTableViewController/TopicsTableViewController.swift (100%)
 rename ExamEGERussian/Sources/PresentationLayer/{UserStories => }/Topics/View/TopicsTableViewController/TopicsTableViewController.xib (100%)
 rename ExamEGERussian/Sources/PresentationLayer/{UserStories => }/Topics/View/TopicsView.swift (100%)

diff --git a/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift b/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
index 7b4c4097c3..80c6453617 100644
--- a/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
+++ b/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
@@ -8,13 +8,12 @@
 
 import UIKit
 
-// MARK: RootNavigationManager
-
 final class RootNavigationManager {
 
-    // MARK: - Instance Variables
+    // MARK: - Instance Properties
 
     private unowned let serviceComponents: ServiceComponents
+    private weak var navigationController: UINavigationController?
 
     // MARK: Init
 
@@ -29,13 +28,23 @@ final class RootNavigationManager {
         controller.presenter = TopicsPresenterImpl(
             view: controller,
             model: KnowledgeGraph(),
+            router: self,
             userRegistrationService: serviceComponents.userRegistrationService,
             graphService: serviceComponents.graphService
         )
-        let navigationController = UINavigationController(rootViewController: controller)
+        navigationController = UINavigationController(rootViewController: controller)
 
         window.rootViewController = navigationController
         window.makeKeyAndVisible()
     }
 
 }
+
+// MARK: - RootNavigationManager: TopicsRouter -
+
+extension RootNavigationManager: TopicsRouter {
+    func showLessonsForTopicWithId(_ id: String) {
+        let controller = LessonsTableViewController()
+        navigationController?.pushViewController(controller, animated: true)
+    }
+}
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonTableViewCell/LessonTableViewCell.swift b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonTableViewCell/LessonTableViewCell.swift
new file mode 100644
index 0000000000..829d32dcaa
--- /dev/null
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonTableViewCell/LessonTableViewCell.swift
@@ -0,0 +1,13 @@
+//
+//  LessonTableViewCell.swift
+//  ExamEGERussian
+//
+//  Created by Ivan Magda on 24/07/2018.
+//  Copyright © 2018 Alex Karpov. All rights reserved.
+//
+
+import UIKit
+
+final class LessonTableViewCell: UITableViewCell {
+    @IBOutlet var descriptionTitleLabel: UILabel!
+}
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonTableViewCell/LessonTableViewCell.xib b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonTableViewCell/LessonTableViewCell.xib
new file mode 100644
index 0000000000..a8aec1d898
--- /dev/null
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonTableViewCell/LessonTableViewCell.xib
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="14113" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+    <device id="retina4_7" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14088"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <tableViewCell contentMode="scaleToFill" selectionStyle="default" indentationWidth="10" id="KGk-i7-Jjw" customClass="LessonTableViewCell" customModule="ExamEGERussian" customModuleProvider="target">
+            <rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
+            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+            <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="KGk-i7-Jjw" id="H2p-sc-9uM">
+                <rect key="frame" x="0.0" y="0.0" width="320" height="43.5"/>
+                <autoresizingMask key="autoresizingMask"/>
+                <subviews>
+                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Title" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="JXd-Fv-7te">
+                        <rect key="frame" x="20" y="12" width="33.5" height="21"/>
+                        <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                        <nil key="textColor"/>
+                        <nil key="highlightedColor"/>
+                    </label>
+                </subviews>
+                <constraints>
+                    <constraint firstItem="JXd-Fv-7te" firstAttribute="centerY" secondItem="H2p-sc-9uM" secondAttribute="centerY" id="Ows-r2-NpN"/>
+                    <constraint firstItem="JXd-Fv-7te" firstAttribute="leading" secondItem="H2p-sc-9uM" secondAttribute="leading" constant="20" symbolic="YES" id="yD4-mM-C7T"/>
+                </constraints>
+            </tableViewCellContentView>
+            <viewLayoutGuide key="safeArea" id="njF-e1-oar"/>
+            <connections>
+                <outlet property="descriptionTitleLabel" destination="JXd-Fv-7te" id="4LX-Qh-x68"/>
+            </connections>
+        </tableViewCell>
+    </objects>
+</document>
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift
new file mode 100644
index 0000000000..65efc41768
--- /dev/null
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift
@@ -0,0 +1,95 @@
+//
+//  LessonsTableViewController.swift
+//  ExamEGERussian
+//
+//  Created by Ivan Magda on 24/07/2018.
+//  Copyright © 2018 Alex Karpov. All rights reserved.
+//
+
+import UIKit
+
+class LessonsTableViewController: UITableViewController {
+        
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        // Uncomment the following line to preserve selection between presentations
+        // self.clearsSelectionOnViewWillAppear = false
+
+        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
+        // self.navigationItem.rightBarButtonItem = self.editButtonItem
+    }
+
+    override func didReceiveMemoryWarning() {
+        super.didReceiveMemoryWarning()
+        // Dispose of any resources that can be recreated.
+    }
+
+    // MARK: - Table view data source
+
+    override func numberOfSections(in tableView: UITableView) -> Int {
+        // #warning Incomplete implementation, return the number of sections
+        return 0
+    }
+
+    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        // #warning Incomplete implementation, return the number of rows
+        return 0
+    }
+
+    /*
+    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        let cell = tableView.dequeueReusableCell(withIdentifier: "reuseIdentifier", for: indexPath)
+
+        // Configure the cell...
+
+        return cell
+    }
+    */
+
+    /*
+    // Override to support conditional editing of the table view.
+    override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
+        // Return false if you do not want the specified item to be editable.
+        return true
+    }
+    */
+
+    /*
+    // Override to support editing the table view.
+    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
+        if editingStyle == .delete {
+            // Delete the row from the data source
+            tableView.deleteRows(at: [indexPath], with: .fade)
+        } else if editingStyle == .insert {
+            // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
+        }    
+    }
+    */
+
+    /*
+    // Override to support rearranging the table view.
+    override func tableView(_ tableView: UITableView, moveRowAt fromIndexPath: IndexPath, to: IndexPath) {
+
+    }
+    */
+
+    /*
+    // Override to support conditional rearranging of the table view.
+    override func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
+        // Return false if you do not want the item to be re-orderable.
+        return true
+    }
+    */
+
+    /*
+    // MARK: - Navigation
+
+    // In a storyboard-based application, you will often want to do a little preparation before navigation
+    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
+        // Get the new view controller using segue.destinationViewController.
+        // Pass the selected object to the new view controller.
+    }
+    */
+    
+}
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.xib b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.xib
new file mode 100644
index 0000000000..de53f77ed1
--- /dev/null
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.xib
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="13142" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12042"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="LessonsTableViewController" customModuleProvider="target">
+            <connections>
+                <outlet property="view" destination="i5M-Pr-FkT" id="sfx-zR-JGt"/>
+            </connections>
+        </placeholder>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <tableView opaque="NO" clipsSubviews="YES" clearsContextBeforeDrawing="NO" contentMode="scaleToFill" bouncesZoom="NO" style="plain" separatorStyle="default" rowHeight="44" sectionHeaderHeight="22" sectionFooterHeight="22" id="i5M-Pr-FkT">
+            <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+            <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+            <viewLayoutGuide key="safeArea" id="vLr-E1-eTs"/>
+            <connections>
+                <outlet property="dataSource" destination="-1" id="Tng-2m-Rnh"/>
+                <outlet property="delegate" destination="-1" id="9aC-8N-iBw"/>
+            </connections>
+        </tableView>
+    </objects>
+</document>
diff --git a/ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/Presenter/TopicsPresenter.swift b/ExamEGERussian/Sources/PresentationLayer/Topics/Presenter/TopicsPresenter.swift
similarity index 100%
rename from ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/Presenter/TopicsPresenter.swift
rename to ExamEGERussian/Sources/PresentationLayer/Topics/Presenter/TopicsPresenter.swift
diff --git a/ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/Presenter/TopicsPresenterImpl.swift b/ExamEGERussian/Sources/PresentationLayer/Topics/Presenter/TopicsPresenterImpl.swift
similarity index 89%
rename from ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/Presenter/TopicsPresenterImpl.swift
rename to ExamEGERussian/Sources/PresentationLayer/Topics/Presenter/TopicsPresenterImpl.swift
index 047d86fb4d..fcd939932b 100644
--- a/ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/Presenter/TopicsPresenterImpl.swift
+++ b/ExamEGERussian/Sources/PresentationLayer/Topics/Presenter/TopicsPresenterImpl.swift
@@ -8,17 +8,23 @@
 
 import Foundation
 
+protocol TopicsRouter: class {
+    func showLessonsForTopicWithId(_ id: String)
+}
+
 final class TopicsPresenterImpl: TopicsPresenter {
 
     private weak var view: TopicsView?
+    private weak var router: TopicsRouter?
     private var graph: KnowledgeGraph
     private let userRegistrationService: UserRegistrationService
     private let graphService: GraphService
 
-    init(view: TopicsView, model: KnowledgeGraph,
+    init(view: TopicsView, model: KnowledgeGraph, router: TopicsRouter,
          userRegistrationService: UserRegistrationService, graphService: GraphService) {
         self.view = view
         self.graph = model
+        self.router = router
         self.userRegistrationService = userRegistrationService
         self.graphService = graphService
     }
@@ -30,7 +36,7 @@ final class TopicsPresenterImpl: TopicsPresenter {
 
     func selectTopic(with viewData: TopicsViewData) {
         guard let topic = graph[viewData.id]?.key else { return }
-        showLessons(for: topic)
+        router?.showLessonsForTopicWithId(topic.id)
     }
 
     // MARK: - Private API
@@ -63,10 +69,6 @@ final class TopicsPresenterImpl: TopicsPresenter {
         view?.displayError(title: NSLocalizedString("Error", comment: ""), message: error.localizedDescription)
     }
 
-    private func showLessons<T>(for vertex: KnowledgeGraphVertex<T>) {
-        print("\(#function) \(vertex.title)")
-    }
-
     private func viewTopicsFrom(_ vertices: [KnowledgeGraphVertex<String>]) -> [TopicsViewData] {
         return vertices.map { viewTopicFromVertex($0) }
     }
diff --git a/ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/View/TopicTableViewCell/TopicTableViewCell.swift b/ExamEGERussian/Sources/PresentationLayer/Topics/View/TopicTableViewCell/TopicTableViewCell.swift
similarity index 100%
rename from ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/View/TopicTableViewCell/TopicTableViewCell.swift
rename to ExamEGERussian/Sources/PresentationLayer/Topics/View/TopicTableViewCell/TopicTableViewCell.swift
diff --git a/ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/View/TopicTableViewCell/TopicTableViewCell.xib b/ExamEGERussian/Sources/PresentationLayer/Topics/View/TopicTableViewCell/TopicTableViewCell.xib
similarity index 100%
rename from ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/View/TopicTableViewCell/TopicTableViewCell.xib
rename to ExamEGERussian/Sources/PresentationLayer/Topics/View/TopicTableViewCell/TopicTableViewCell.xib
diff --git a/ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/View/TopicsTableViewController/TopicsTableViewController.swift b/ExamEGERussian/Sources/PresentationLayer/Topics/View/TopicsTableViewController/TopicsTableViewController.swift
similarity index 100%
rename from ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/View/TopicsTableViewController/TopicsTableViewController.swift
rename to ExamEGERussian/Sources/PresentationLayer/Topics/View/TopicsTableViewController/TopicsTableViewController.swift
diff --git a/ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/View/TopicsTableViewController/TopicsTableViewController.xib b/ExamEGERussian/Sources/PresentationLayer/Topics/View/TopicsTableViewController/TopicsTableViewController.xib
similarity index 100%
rename from ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/View/TopicsTableViewController/TopicsTableViewController.xib
rename to ExamEGERussian/Sources/PresentationLayer/Topics/View/TopicsTableViewController/TopicsTableViewController.xib
diff --git a/ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/View/TopicsView.swift b/ExamEGERussian/Sources/PresentationLayer/Topics/View/TopicsView.swift
similarity index 100%
rename from ExamEGERussian/Sources/PresentationLayer/UserStories/Topics/View/TopicsView.swift
rename to ExamEGERussian/Sources/PresentationLayer/Topics/View/TopicsView.swift
diff --git a/Stepic.xcodeproj/project.pbxproj b/Stepic.xcodeproj/project.pbxproj
index 8b9692cda6..ce1852908b 100644
--- a/Stepic.xcodeproj/project.pbxproj
+++ b/Stepic.xcodeproj/project.pbxproj
@@ -1898,6 +1898,10 @@
 		2C23C5E61F6BFA8800FC2B7C /* RegistrationPresenter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C23C5E51F6BFA8800FC2B7C /* RegistrationPresenter.swift */; };
 		2C2485472101D91F006F8858 /* RestorableBackgroundDownloaderProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2485462101D91F006F8858 /* RestorableBackgroundDownloaderProtocol.swift */; };
 		2C2485492101EE3E006F8858 /* DownloaderTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2485482101EE3E006F8858 /* DownloaderTests.swift */; };
+		2C2FD77A2107359E00609621 /* LessonsTableViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2FD7782107359E00609621 /* LessonsTableViewController.swift */; };
+		2C2FD77B2107359E00609621 /* LessonsTableViewController.xib in Resources */ = {isa = PBXBuildFile; fileRef = 2C2FD7792107359E00609621 /* LessonsTableViewController.xib */; };
+		2C2FD77F210735E000609621 /* LessonTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2FD77D210735E000609621 /* LessonTableViewCell.swift */; };
+		2C2FD780210735E000609621 /* LessonTableViewCell.xib in Resources */ = {isa = PBXBuildFile; fileRef = 2C2FD77E210735E000609621 /* LessonTableViewCell.xib */; };
 		2C315E6D1F0A947D0039E4F0 /* CodeLanguagePickerViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 081BF3461EFEF630002F84AA /* CodeLanguagePickerViewController.swift */; };
 		2C315E6E1F0A947D0039E4F0 /* LessonViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 089984281ECDE188005C0B27 /* LessonViewController.swift */; };
 		2C315E6F1F0A947D0039E4F0 /* LessonPresenter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0899842B1ECDE194005C0B27 /* LessonPresenter.swift */; };
@@ -5582,6 +5586,10 @@
 		2C2485462101D91F006F8858 /* RestorableBackgroundDownloaderProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RestorableBackgroundDownloaderProtocol.swift; sourceTree = "<group>"; };
 		2C2485482101EE3E006F8858 /* DownloaderTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DownloaderTests.swift; sourceTree = "<group>"; };
 		2C2544081F3480BE004DB3D9 /* AchievementNotificationView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AchievementNotificationView.swift; sourceTree = "<group>"; };
+		2C2FD7782107359E00609621 /* LessonsTableViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LessonsTableViewController.swift; sourceTree = "<group>"; };
+		2C2FD7792107359E00609621 /* LessonsTableViewController.xib */ = {isa = PBXFileReference; lastKnownFileType = file.xib; path = LessonsTableViewController.xib; sourceTree = "<group>"; };
+		2C2FD77D210735E000609621 /* LessonTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LessonTableViewCell.swift; sourceTree = "<group>"; };
+		2C2FD77E210735E000609621 /* LessonTableViewCell.xib */ = {isa = PBXFileReference; lastKnownFileType = file.xib; path = LessonTableViewCell.xib; sourceTree = "<group>"; };
 		2C33CBDA20EC2C2E009956B0 /* UserRegistrationServiceImplementation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UserRegistrationServiceImplementation.swift; sourceTree = "<group>"; };
 		2C35C4981F4DA3B6002F3BF4 /* AdaptiveAchievementsPresenter.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AdaptiveAchievementsPresenter.swift; sourceTree = "<group>"; };
 		2C35C4C61F4DA462002F3BF4 /* ru */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; name = ru; path = LeaderboardNames/ru.lproj/adjectives_f.plist; sourceTree = "<group>"; };
@@ -8388,6 +8396,41 @@
 			name = AchievementNotificationView;
 			sourceTree = "<group>";
 		};
+		2C2FD7762107355D00609621 /* Lessons */ = {
+			isa = PBXGroup;
+			children = (
+				2C2FD7772107357800609621 /* View */,
+			);
+			path = Lessons;
+			sourceTree = "<group>";
+		};
+		2C2FD7772107357800609621 /* View */ = {
+			isa = PBXGroup;
+			children = (
+				2C2FD77C210735AE00609621 /* LessonsTableViewController */,
+				2C2FD781210735EB00609621 /* LessonTableViewCell */,
+			);
+			path = View;
+			sourceTree = "<group>";
+		};
+		2C2FD77C210735AE00609621 /* LessonsTableViewController */ = {
+			isa = PBXGroup;
+			children = (
+				2C2FD7782107359E00609621 /* LessonsTableViewController.swift */,
+				2C2FD7792107359E00609621 /* LessonsTableViewController.xib */,
+			);
+			path = LessonsTableViewController;
+			sourceTree = "<group>";
+		};
+		2C2FD781210735EB00609621 /* LessonTableViewCell */ = {
+			isa = PBXGroup;
+			children = (
+				2C2FD77D210735E000609621 /* LessonTableViewCell.swift */,
+				2C2FD77E210735E000609621 /* LessonTableViewCell.xib */,
+			);
+			path = LessonTableViewCell;
+			sourceTree = "<group>";
+		};
 		2C32BAEC1F9636520003DD91 /* Utils */ = {
 			isa = PBXGroup;
 			children = (
@@ -8475,14 +8518,6 @@
 			path = AppDelegate;
 			sourceTree = "<group>";
 		};
-		2C59F05820EB8E3700666EE0 /* UserStories */ = {
-			isa = PBXGroup;
-			children = (
-				2C59F06420EBA1EB00666EE0 /* Topics */,
-			);
-			path = UserStories;
-			sourceTree = "<group>";
-		};
 		2C59F05A20EB8E5C00666EE0 /* SupportingFiles */ = {
 			isa = PBXGroup;
 			children = (
@@ -8496,7 +8531,8 @@
 		2C59F05C20EB8F0D00666EE0 /* PresentationLayer */ = {
 			isa = PBXGroup;
 			children = (
-				2C59F05820EB8E3700666EE0 /* UserStories */,
+				2C59F06420EBA1EB00666EE0 /* Topics */,
+				2C2FD7762107355D00609621 /* Lessons */,
 				2C1BF0AF2107328900EA83CA /* LaunchScreen.storyboard */,
 			);
 			path = PresentationLayer;
@@ -10854,9 +10890,11 @@
 				2CFE248120ED112100AF1E3D /* Auth.plist in Resources */,
 				2CFE247C20ECF7F700AF1E3D /* Config.plist in Resources */,
 				2CE3C2BA21007D3D003AB54A /* TopicsTableViewController.xib in Resources */,
+				2C2FD77B2107359E00609621 /* LessonsTableViewController.xib in Resources */,
 				2C59F03120EB8AC900666EE0 /* Assets.xcassets in Resources */,
 				2CCB5A3E2100824F0091A605 /* TopicTableViewCell.xib in Resources */,
 				2C1BF0B02107328900EA83CA /* LaunchScreen.storyboard in Resources */,
+				2C2FD780210735E000609621 /* LessonTableViewCell.xib in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -14814,6 +14852,7 @@
 				2CCB5A452100849A0091A605 /* UIViewController+Alert.swift in Sources */,
 				2C9499F220ECC0BA0049E9A8 /* DeleteDeviceExecutableTask.swift in Sources */,
 				2C33CC0D20EC33FF009956B0 /* CreateRequestMaker.swift in Sources */,
+				2C2FD77A2107359E00609621 /* LessonsTableViewController.swift in Sources */,
 				2C9499C820ECBC6D0049E9A8 /* StepikModelView.swift in Sources */,
 				2C9499E220ECBE650049E9A8 /* NSDateExtensions.swift in Sources */,
 				2C9499FA20ECC1690049E9A8 /* PersistentTaskRecoveryManager.swift in Sources */,
@@ -14881,6 +14920,7 @@
 				2C9499D320ECBCE10049E9A8 /* MatchingReply.swift in Sources */,
 				2C9499AE20ECBA670049E9A8 /* LastStep.swift in Sources */,
 				2C94999D20ECB9080049E9A8 /* CoursePlainEntity.swift in Sources */,
+				2C2FD77F210735E000609621 /* LessonTableViewCell.swift in Sources */,
 				2C33CBD920EC2BBD009956B0 /* UserRegistrationService.swift in Sources */,
 				2C949A3320ECC70D0049E9A8 /* AchievementProgressesAPI.swift in Sources */,
 				2C9499C520ECBC0F0049E9A8 /* PathManager.swift in Sources */,

From 8e483bb41e7ec4188bbce8c4f7ba94c3a9f87a12 Mon Sep 17 00:00:00 2001
From: Ivan Magda <imagda15@gmail.com>
Date: Tue, 24 Jul 2018 17:19:07 +0300
Subject: [PATCH 03/14] Create lessons service

---
 .../LessonsService/LessonsService.swift       | 14 ++++
 .../LessonsService/LessonsServiceImpl.swift   | 31 ++++++++
 ...ft => KnowledgeGraphGoalPlainObject.swift} |  2 +-
 ... => KnowledgeGraphLessonPlainObject.swift} |  2 +-
 .../KnowledgeGraphPlainObject.swift           | 14 ++--
 ...t => KnowledgeGraphTopicPlainObject.swift} |  2 +-
 ... KnowledgeGraphTopicsMapPlainObject.swift} |  6 +-
 .../PlainObjects/LessonPlainObject.swift      | 15 ++++
 .../LessonsTableViewController.swift          | 77 +++----------------
 .../KnowledgeGraphPlainObject+Create.swift    | 18 ++---
 .../Helpers/Mocks/TopicsRouterMock.swift      | 15 ++++
 .../TopicsPresenterTests.swift                |  1 +
 .../TopicsTableViewControllerTests.swift      |  1 +
 Stepic.xcodeproj/project.pbxproj              | 58 ++++++++++----
 14 files changed, 150 insertions(+), 106 deletions(-)
 create mode 100644 ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsService.swift
 create mode 100644 ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsServiceImpl.swift
 rename ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/{GoalPlainObject.swift => KnowledgeGraphGoalPlainObject.swift} (94%)
 rename ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/{LessonPlainObject.swift => KnowledgeGraphLessonPlainObject.swift} (87%)
 rename ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/{TopicPlainObject.swift => KnowledgeGraphTopicPlainObject.swift} (94%)
 rename ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/{TopicsMapPlainObject.swift => KnowledgeGraphTopicsMapPlainObject.swift} (59%)
 create mode 100644 ExamEGERussian/Sources/Model/PlainObjects/LessonPlainObject.swift
 create mode 100644 ExamEGERussianTests/Helpers/Mocks/TopicsRouterMock.swift

diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsService.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsService.swift
new file mode 100644
index 0000000000..4b1ea21a1a
--- /dev/null
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsService.swift
@@ -0,0 +1,14 @@
+//
+//  LessonsService.swift
+//  ExamEGERussian
+//
+//  Created by Ivan Magda on 24/07/2018.
+//  Copyright © 2018 Alex Karpov. All rights reserved.
+//
+
+import Foundation
+import PromiseKit
+
+protocol LessonsService: class {
+    func obtainLessons(with ids: [Int]) -> Promise<[LessonPlainObject]>
+}
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsServiceImpl.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsServiceImpl.swift
new file mode 100644
index 0000000000..8980cbd4e6
--- /dev/null
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsServiceImpl.swift
@@ -0,0 +1,31 @@
+//
+//  LessonsServiceImpl.swift
+//  ExamEGERussian
+//
+//  Created by Ivan Magda on 24/07/2018.
+//  Copyright © 2018 Alex Karpov. All rights reserved.
+//
+
+import Foundation
+import PromiseKit
+import Alamofire
+
+final class LessonsServiceImpl: LessonsService {
+    private struct Response: Codable {
+        let lessons: [LessonPlainObject]
+    }
+
+    func obtainLessons(with ids: [Int]) -> Promise<[LessonPlainObject]> {
+        let url = "\(StepicApplicationsInfo.apiURL)/lessons"
+        let parameters = ["ids": ids]
+        let headers = AuthInfo.shared.initialHTTPHeaders
+
+        return firstly {
+            Alamofire
+                .request(url, parameters: parameters, headers: headers)
+                .responseDecodable(Response.self)
+        }.then { response in
+            Promise.value(response.lessons)
+        }
+    }
+}
diff --git a/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/GoalPlainObject.swift b/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphGoalPlainObject.swift
similarity index 94%
rename from ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/GoalPlainObject.swift
rename to ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphGoalPlainObject.swift
index cad1f66b0f..09805f8575 100755
--- a/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/GoalPlainObject.swift
+++ b/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphGoalPlainObject.swift
@@ -8,7 +8,7 @@
 
 import Foundation
 
-struct GoalPlainObject: Codable {
+struct KnowledgeGraphGoalPlainObject: Codable {
     let title: String
     let id: String
     let requiredTopics: [String]
diff --git a/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/LessonPlainObject.swift b/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphLessonPlainObject.swift
similarity index 87%
rename from ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/LessonPlainObject.swift
rename to ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphLessonPlainObject.swift
index d63df8e183..4c59e0cb8e 100755
--- a/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/LessonPlainObject.swift
+++ b/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphLessonPlainObject.swift
@@ -8,7 +8,7 @@
 
 import Foundation
 
-struct LessonPlainObject: Codable {
+struct KnowledgeGraphLessonPlainObject: Codable {
     let id: Int
     let type: String
     let course: String
diff --git a/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphPlainObject.swift b/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphPlainObject.swift
index 351a49f0ed..fae3996edb 100755
--- a/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphPlainObject.swift
+++ b/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphPlainObject.swift
@@ -9,9 +9,9 @@
 import Foundation
 
 struct KnowledgeGraphPlainObject: Codable {
-    let goals: [GoalPlainObject]
-    let topics: [TopicPlainObject]
-    let topicsMap: [TopicsMapPlainObject]
+    let goals: [KnowledgeGraphGoalPlainObject]
+    let topics: [KnowledgeGraphTopicPlainObject]
+    let topicsMap: [KnowledgeGraphTopicsMapPlainObject]
 
     enum CodingKeys: String, CodingKey {
         case goals
@@ -19,7 +19,7 @@ struct KnowledgeGraphPlainObject: Codable {
         case topicsMap = "topics-map"
     }
 
-    init(goals: [GoalPlainObject], topics: [TopicPlainObject], topicsMap: [TopicsMapPlainObject]) {
+    init(goals: [KnowledgeGraphGoalPlainObject], topics: [KnowledgeGraphTopicPlainObject], topicsMap: [KnowledgeGraphTopicsMapPlainObject]) {
         self.goals = goals
         self.topics = topics
         self.topicsMap = topicsMap
@@ -27,8 +27,8 @@ struct KnowledgeGraphPlainObject: Codable {
 
     init(from decoder: Decoder) throws {
         let container = try decoder.container(keyedBy: CodingKeys.self)
-        goals = try container.decode([GoalPlainObject].self, forKey: .goals)
-        topics = try container.decode([TopicPlainObject].self, forKey: .topics)
-        topicsMap = try container.decode([TopicsMapPlainObject].self, forKey: .topicsMap)
+        goals = try container.decode([KnowledgeGraphGoalPlainObject].self, forKey: .goals)
+        topics = try container.decode([KnowledgeGraphTopicPlainObject].self, forKey: .topics)
+        topicsMap = try container.decode([KnowledgeGraphTopicsMapPlainObject].self, forKey: .topicsMap)
     }
 }
diff --git a/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/TopicPlainObject.swift b/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphTopicPlainObject.swift
similarity index 94%
rename from ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/TopicPlainObject.swift
rename to ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphTopicPlainObject.swift
index f74bd6cb23..131514dd50 100755
--- a/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/TopicPlainObject.swift
+++ b/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphTopicPlainObject.swift
@@ -8,7 +8,7 @@
 
 import Foundation
 
-struct TopicPlainObject: Codable {
+struct KnowledgeGraphTopicPlainObject: Codable {
     let id: String
     let title: String
     let requiredFor: String?
diff --git a/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/TopicsMapPlainObject.swift b/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphTopicsMapPlainObject.swift
similarity index 59%
rename from ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/TopicsMapPlainObject.swift
rename to ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphTopicsMapPlainObject.swift
index 3fef1898fe..097d100c1e 100755
--- a/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/TopicsMapPlainObject.swift
+++ b/ExamEGERussian/Sources/Model/PlainObjects/KnowledgeGraph/KnowledgeGraphTopicsMapPlainObject.swift
@@ -8,11 +8,11 @@
 
 import Foundation
 
-struct TopicsMapPlainObject: Codable {
+struct KnowledgeGraphTopicsMapPlainObject: Codable {
     let id: String
-    let lessons: [LessonPlainObject]
+    let lessons: [KnowledgeGraphLessonPlainObject]
 
-    init(id: String, lessons: [LessonPlainObject]) {
+    init(id: String, lessons: [KnowledgeGraphLessonPlainObject]) {
         self.id = id
         self.lessons = lessons
     }
diff --git a/ExamEGERussian/Sources/Model/PlainObjects/LessonPlainObject.swift b/ExamEGERussian/Sources/Model/PlainObjects/LessonPlainObject.swift
new file mode 100644
index 0000000000..c1fc7233b0
--- /dev/null
+++ b/ExamEGERussian/Sources/Model/PlainObjects/LessonPlainObject.swift
@@ -0,0 +1,15 @@
+//
+//  LessonPlainObject.swift
+//  ExamEGERussian
+//
+//  Created by Ivan Magda on 24/07/2018.
+//  Copyright © 2018 Alex Karpov. All rights reserved.
+//
+
+import Foundation
+
+struct LessonPlainObject: Codable {
+    let id: Int
+    let steps: [Int]
+    let title: String
+}
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift
index 65efc41768..a39a4ecfc6 100644
--- a/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift
@@ -8,88 +8,31 @@
 
 import UIKit
 
-class LessonsTableViewController: UITableViewController {
-        
+final class LessonsTableViewController: UITableViewController {
+
     override func viewDidLoad() {
         super.viewDidLoad()
 
-        // Uncomment the following line to preserve selection between presentations
-        // self.clearsSelectionOnViewWillAppear = false
-
-        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
-        // self.navigationItem.rightBarButtonItem = self.editButtonItem
-    }
-
-    override func didReceiveMemoryWarning() {
-        super.didReceiveMemoryWarning()
-        // Dispose of any resources that can be recreated.
+        tableView.registerNib(for: LessonTableViewCell.self)
     }
 
-    // MARK: - Table view data source
-
-    override func numberOfSections(in tableView: UITableView) -> Int {
-        // #warning Incomplete implementation, return the number of sections
-        return 0
-    }
+    // MARK: - UITableViewDataSource
 
     override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        // #warning Incomplete implementation, return the number of rows
-        return 0
+        return 10
     }
 
-    /*
     override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
-        let cell = tableView.dequeueReusableCell(withIdentifier: "reuseIdentifier", for: indexPath)
-
-        // Configure the cell...
+        let cell: LessonTableViewCell = tableView.dequeueReusableCell(for: indexPath)
+        cell.descriptionTitleLabel.text = "Title for row: \(indexPath.row)"
 
         return cell
     }
-    */
 
-    /*
-    // Override to support conditional editing of the table view.
-    override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
-        // Return false if you do not want the specified item to be editable.
-        return true
-    }
-    */
+    // MARK: - UITableViewDelegate
 
-    /*
-    // Override to support editing the table view.
-    override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
-        if editingStyle == .delete {
-            // Delete the row from the data source
-            tableView.deleteRows(at: [indexPath], with: .fade)
-        } else if editingStyle == .insert {
-            // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
-        }    
+    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        tableView.deselectRow(at: indexPath, animated: true)
     }
-    */
 
-    /*
-    // Override to support rearranging the table view.
-    override func tableView(_ tableView: UITableView, moveRowAt fromIndexPath: IndexPath, to: IndexPath) {
-
-    }
-    */
-
-    /*
-    // Override to support conditional rearranging of the table view.
-    override func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
-        // Return false if you do not want the item to be re-orderable.
-        return true
-    }
-    */
-
-    /*
-    // MARK: - Navigation
-
-    // In a storyboard-based application, you will often want to do a little preparation before navigation
-    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
-        // Get the new view controller using segue.destinationViewController.
-        // Pass the selected object to the new view controller.
-    }
-    */
-    
 }
diff --git a/ExamEGERussianTests/Helpers/Creators/KnowledgeGraphPlainObject+Create.swift b/ExamEGERussianTests/Helpers/Creators/KnowledgeGraphPlainObject+Create.swift
index c79c923163..839b2f40fc 100644
--- a/ExamEGERussianTests/Helpers/Creators/KnowledgeGraphPlainObject+Create.swift
+++ b/ExamEGERussianTests/Helpers/Creators/KnowledgeGraphPlainObject+Create.swift
@@ -12,21 +12,21 @@ import Foundation
 extension KnowledgeGraphPlainObject {
     static func createGraph() -> KnowledgeGraphPlainObject {
         let goals = [
-            GoalPlainObject(title: "Морфология", id: "morph", requiredTopics: ["slitno-razdelno"])
+            KnowledgeGraphGoalPlainObject(title: "Морфология", id: "morph", requiredTopics: ["slitno-razdelno"])
         ]
         let topics = [
-            TopicPlainObject(id: "slitno-razdelno", title: "B13 Слитное раздельное написание", requiredFor: nil),
-            TopicPlainObject(id: "pristavki", title: "B9 Приставки", requiredFor: "slitno-razdelno")
+            KnowledgeGraphTopicPlainObject(id: "slitno-razdelno", title: "B13 Слитное раздельное написание", requiredFor: nil),
+            KnowledgeGraphTopicPlainObject(id: "pristavki", title: "B9 Приставки", requiredFor: "slitno-razdelno")
         ]
         let lessons = [
-            LessonPlainObject(id: 82810, type: "theory", course: "7798"),
-            LessonPlainObject(id: 82809, type: "theory", course: "7798"),
-            LessonPlainObject(id: 86295, type: "theory", course: "7798"),
-            LessonPlainObject(id: 86297, type: "theory", course: "7798"),
-            LessonPlainObject(id: 6000, type: "practice", course: "7798")
+            KnowledgeGraphLessonPlainObject(id: 82810, type: "theory", course: "7798"),
+            KnowledgeGraphLessonPlainObject(id: 82809, type: "theory", course: "7798"),
+            KnowledgeGraphLessonPlainObject(id: 86295, type: "theory", course: "7798"),
+            KnowledgeGraphLessonPlainObject(id: 86297, type: "theory", course: "7798"),
+            KnowledgeGraphLessonPlainObject(id: 6000, type: "practice", course: "7798")
         ]
         let topicsMap = [
-            TopicsMapPlainObject(id: "slitno-razdelno", lessons: lessons)
+            KnowledgeGraphTopicsMapPlainObject(id: "slitno-razdelno", lessons: lessons)
         ]
 
         return KnowledgeGraphPlainObject(goals: goals, topics: topics, topicsMap: topicsMap)
diff --git a/ExamEGERussianTests/Helpers/Mocks/TopicsRouterMock.swift b/ExamEGERussianTests/Helpers/Mocks/TopicsRouterMock.swift
new file mode 100644
index 0000000000..0e0083bb56
--- /dev/null
+++ b/ExamEGERussianTests/Helpers/Mocks/TopicsRouterMock.swift
@@ -0,0 +1,15 @@
+//
+//  TopicsRouterMock.swift
+//  ExamEGERussianTests
+//
+//  Created by Ivan Magda on 24/07/2018.
+//  Copyright © 2018 Alex Karpov. All rights reserved.
+//
+
+import Foundation
+@testable import ExamEGERussian
+
+final class TopicsRouterMock: TopicsRouter {
+    func showLessonsForTopicWithId(_ id: String) {
+    }
+}
diff --git a/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsPresenterTests.swift b/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsPresenterTests.swift
index 748fdde36f..fc1087576a 100644
--- a/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsPresenterTests.swift
+++ b/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsPresenterTests.swift
@@ -23,6 +23,7 @@ class TopicsPresenterTests: XCTestCase {
         topicsPresenter = TopicsPresenterImpl(
             view: topicsViewSpy,
             model: KnowledgeGraph(),
+            router: TopicsRouterMock(),
             userRegistrationService: userRegistrationService,
             graphService: graphService
         )
diff --git a/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsTableViewControllerTests.swift b/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsTableViewControllerTests.swift
index d942be48f7..e92053f14e 100644
--- a/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsTableViewControllerTests.swift
+++ b/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsTableViewControllerTests.swift
@@ -16,6 +16,7 @@ class TopicsTableViewControllerTests: XCTestCase {
         let presenter = TopicsPresenterImpl(
             view: vc,
             model: KnowledgeGraph(),
+            router: TopicsRouterMock(),
             userRegistrationService: UserRegistrationServiceMock(),
             graphService: GraphServiceMock()
         )
diff --git a/Stepic.xcodeproj/project.pbxproj b/Stepic.xcodeproj/project.pbxproj
index ce1852908b..7dae9edeb5 100644
--- a/Stepic.xcodeproj/project.pbxproj
+++ b/Stepic.xcodeproj/project.pbxproj
@@ -1902,6 +1902,10 @@
 		2C2FD77B2107359E00609621 /* LessonsTableViewController.xib in Resources */ = {isa = PBXBuildFile; fileRef = 2C2FD7792107359E00609621 /* LessonsTableViewController.xib */; };
 		2C2FD77F210735E000609621 /* LessonTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2FD77D210735E000609621 /* LessonTableViewCell.swift */; };
 		2C2FD780210735E000609621 /* LessonTableViewCell.xib in Resources */ = {isa = PBXBuildFile; fileRef = 2C2FD77E210735E000609621 /* LessonTableViewCell.xib */; };
+		2C2FD7842107448F00609621 /* LessonsService.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2FD7832107448F00609621 /* LessonsService.swift */; };
+		2C2FD7862107453800609621 /* LessonsServiceImpl.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2FD7852107453800609621 /* LessonsServiceImpl.swift */; };
+		2C2FD78821074FFD00609621 /* TopicsRouterMock.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2FD78721074FFD00609621 /* TopicsRouterMock.swift */; };
+		2C2FD78A2107507200609621 /* LessonPlainObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2FD7892107507200609621 /* LessonPlainObject.swift */; };
 		2C315E6D1F0A947D0039E4F0 /* CodeLanguagePickerViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 081BF3461EFEF630002F84AA /* CodeLanguagePickerViewController.swift */; };
 		2C315E6E1F0A947D0039E4F0 /* LessonViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 089984281ECDE188005C0B27 /* LessonViewController.swift */; };
 		2C315E6F1F0A947D0039E4F0 /* LessonPresenter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0899842B1ECDE194005C0B27 /* LessonPresenter.swift */; };
@@ -3369,11 +3373,11 @@
 		2CA3F55D20FF79860041E893 /* GraphService.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CA3F55C20FF79860041E893 /* GraphService.swift */; };
 		2CA3F55F20FF7A150041E893 /* StepikResult.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CA3F55E20FF7A150041E893 /* StepikResult.swift */; };
 		2CA3F56120FF7C030041E893 /* GraphServiceImpl.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CA3F56020FF7C030041E893 /* GraphServiceImpl.swift */; };
-		2CA3F56720FF82970041E893 /* GoalPlainObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CA3F56220FF82960041E893 /* GoalPlainObject.swift */; };
+		2CA3F56720FF82970041E893 /* KnowledgeGraphGoalPlainObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CA3F56220FF82960041E893 /* KnowledgeGraphGoalPlainObject.swift */; };
 		2CA3F56820FF82970041E893 /* KnowledgeGraphPlainObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CA3F56320FF82960041E893 /* KnowledgeGraphPlainObject.swift */; };
-		2CA3F56920FF82970041E893 /* LessonPlainObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CA3F56420FF82970041E893 /* LessonPlainObject.swift */; };
-		2CA3F56A20FF82970041E893 /* TopicsMapPlainObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CA3F56520FF82970041E893 /* TopicsMapPlainObject.swift */; };
-		2CA3F56B20FF82970041E893 /* TopicPlainObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CA3F56620FF82970041E893 /* TopicPlainObject.swift */; };
+		2CA3F56920FF82970041E893 /* KnowledgeGraphLessonPlainObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CA3F56420FF82970041E893 /* KnowledgeGraphLessonPlainObject.swift */; };
+		2CA3F56A20FF82970041E893 /* KnowledgeGraphTopicsMapPlainObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CA3F56520FF82970041E893 /* KnowledgeGraphTopicsMapPlainObject.swift */; };
+		2CA3F56B20FF82970041E893 /* KnowledgeGraphTopicPlainObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CA3F56620FF82970041E893 /* KnowledgeGraphTopicPlainObject.swift */; };
 		2CA5E5A5200E1FC500CE77B0 /* AdaptiveStatsManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C733C391F29E090000E7FAF /* AdaptiveStatsManager.swift */; };
 		2CA5E5A6200E1FC700CE77B0 /* AdaptiveRatingHelper.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CEDA35F1F336FEC005F4A5D /* AdaptiveRatingHelper.swift */; };
 		2CA5E5A7200E1FCA00CE77B0 /* AdaptiveRatingManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C76ACCC1F16496C0077D9D7 /* AdaptiveRatingManager.swift */; };
@@ -5590,6 +5594,10 @@
 		2C2FD7792107359E00609621 /* LessonsTableViewController.xib */ = {isa = PBXFileReference; lastKnownFileType = file.xib; path = LessonsTableViewController.xib; sourceTree = "<group>"; };
 		2C2FD77D210735E000609621 /* LessonTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LessonTableViewCell.swift; sourceTree = "<group>"; };
 		2C2FD77E210735E000609621 /* LessonTableViewCell.xib */ = {isa = PBXFileReference; lastKnownFileType = file.xib; path = LessonTableViewCell.xib; sourceTree = "<group>"; };
+		2C2FD7832107448F00609621 /* LessonsService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LessonsService.swift; sourceTree = "<group>"; };
+		2C2FD7852107453800609621 /* LessonsServiceImpl.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LessonsServiceImpl.swift; sourceTree = "<group>"; };
+		2C2FD78721074FFD00609621 /* TopicsRouterMock.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TopicsRouterMock.swift; sourceTree = "<group>"; };
+		2C2FD7892107507200609621 /* LessonPlainObject.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LessonPlainObject.swift; sourceTree = "<group>"; };
 		2C33CBDA20EC2C2E009956B0 /* UserRegistrationServiceImplementation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UserRegistrationServiceImplementation.swift; sourceTree = "<group>"; };
 		2C35C4981F4DA3B6002F3BF4 /* AdaptiveAchievementsPresenter.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AdaptiveAchievementsPresenter.swift; sourceTree = "<group>"; };
 		2C35C4C61F4DA462002F3BF4 /* ru */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; name = ru; path = LeaderboardNames/ru.lproj/adjectives_f.plist; sourceTree = "<group>"; };
@@ -5717,11 +5725,11 @@
 		2CA3F55C20FF79860041E893 /* GraphService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GraphService.swift; sourceTree = "<group>"; };
 		2CA3F55E20FF7A150041E893 /* StepikResult.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StepikResult.swift; sourceTree = "<group>"; };
 		2CA3F56020FF7C030041E893 /* GraphServiceImpl.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GraphServiceImpl.swift; sourceTree = "<group>"; };
-		2CA3F56220FF82960041E893 /* GoalPlainObject.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = GoalPlainObject.swift; sourceTree = "<group>"; };
+		2CA3F56220FF82960041E893 /* KnowledgeGraphGoalPlainObject.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = KnowledgeGraphGoalPlainObject.swift; sourceTree = "<group>"; };
 		2CA3F56320FF82960041E893 /* KnowledgeGraphPlainObject.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = KnowledgeGraphPlainObject.swift; sourceTree = "<group>"; };
-		2CA3F56420FF82970041E893 /* LessonPlainObject.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = LessonPlainObject.swift; sourceTree = "<group>"; };
-		2CA3F56520FF82970041E893 /* TopicsMapPlainObject.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TopicsMapPlainObject.swift; sourceTree = "<group>"; };
-		2CA3F56620FF82970041E893 /* TopicPlainObject.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TopicPlainObject.swift; sourceTree = "<group>"; };
+		2CA3F56420FF82970041E893 /* KnowledgeGraphLessonPlainObject.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = KnowledgeGraphLessonPlainObject.swift; sourceTree = "<group>"; };
+		2CA3F56520FF82970041E893 /* KnowledgeGraphTopicsMapPlainObject.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = KnowledgeGraphTopicsMapPlainObject.swift; sourceTree = "<group>"; };
+		2CA3F56620FF82970041E893 /* KnowledgeGraphTopicPlainObject.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = KnowledgeGraphTopicPlainObject.swift; sourceTree = "<group>"; };
 		2CA8D3872088D9C000E105E9 /* Adaptive 8290.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = "Adaptive 8290.app"; sourceTree = BUILT_PRODUCTS_DIR; };
 		2CA9D97620109718007AA743 /* AdaptiveStatsPagerViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AdaptiveStatsPagerViewController.swift; sourceTree = "<group>"; };
 		2CA9D97820109727007AA743 /* AdaptiveStatsPresenter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AdaptiveStatsPresenter.swift; sourceTree = "<group>"; };
@@ -8290,6 +8298,7 @@
 			isa = PBXGroup;
 			children = (
 				2C16542720FF8A7000E91F80 /* KnowledgeGraph */,
+				2C2FD7892107507200609621 /* LessonPlainObject.swift */,
 			);
 			path = PlainObjects;
 			sourceTree = "<group>";
@@ -8298,10 +8307,10 @@
 			isa = PBXGroup;
 			children = (
 				2CA3F56320FF82960041E893 /* KnowledgeGraphPlainObject.swift */,
-				2CA3F56220FF82960041E893 /* GoalPlainObject.swift */,
-				2CA3F56620FF82970041E893 /* TopicPlainObject.swift */,
-				2CA3F56520FF82970041E893 /* TopicsMapPlainObject.swift */,
-				2CA3F56420FF82970041E893 /* LessonPlainObject.swift */,
+				2CA3F56220FF82960041E893 /* KnowledgeGraphGoalPlainObject.swift */,
+				2CA3F56620FF82970041E893 /* KnowledgeGraphTopicPlainObject.swift */,
+				2CA3F56520FF82970041E893 /* KnowledgeGraphTopicsMapPlainObject.swift */,
+				2CA3F56420FF82970041E893 /* KnowledgeGraphLessonPlainObject.swift */,
 			);
 			path = KnowledgeGraph;
 			sourceTree = "<group>";
@@ -8431,6 +8440,15 @@
 			path = LessonTableViewCell;
 			sourceTree = "<group>";
 		};
+		2C2FD7822107447300609621 /* LessonsService */ = {
+			isa = PBXGroup;
+			children = (
+				2C2FD7832107448F00609621 /* LessonsService.swift */,
+				2C2FD7852107453800609621 /* LessonsServiceImpl.swift */,
+			);
+			path = LessonsService;
+			sourceTree = "<group>";
+		};
 		2C32BAEC1F9636520003DD91 /* Utils */ = {
 			isa = PBXGroup;
 			children = (
@@ -8595,8 +8613,9 @@
 		2C59F06320EB9FFA00666EE0 /* Services */ = {
 			isa = PBXGroup;
 			children = (
-				2C59F06520EBA26C00666EE0 /* UserRegistrationService */,
 				62E9862365BD47119FA0E1D9 /* GraphService */,
+				2C2FD7822107447300609621 /* LessonsService */,
+				2C59F06520EBA26C00666EE0 /* UserRegistrationService */,
 			);
 			path = Services;
 			sourceTree = "<group>";
@@ -9185,6 +9204,7 @@
 			isa = PBXGroup;
 			children = (
 				2CCB5A632100A5D60091A605 /* GraphServiceMock.swift */,
+				2C2FD78721074FFD00609621 /* TopicsRouterMock.swift */,
 				2CF2246620EF6D900093D844 /* UserRegistrationServiceMock.swift */,
 			);
 			path = Mocks;
@@ -14769,6 +14789,7 @@
 				2C9499DC20ECBD9D0049E9A8 /* Comment.swift in Sources */,
 				2C9499E420ECBE8C0049E9A8 /* CodeLimit.swift in Sources */,
 				2C9499EF20ECC0580049E9A8 /* Notification+FetchMethods.swift in Sources */,
+				2C2FD7842107448F00609621 /* LessonsService.swift in Sources */,
 				2C949A0C20ECC3FC0049E9A8 /* StreaksStepikAlertManager.swift in Sources */,
 				2C94999220ECB7E30049E9A8 /* Unit.swift in Sources */,
 				2C9499FF20ECC26F0049E9A8 /* StepOptions+CoreDataProperties.swift in Sources */,
@@ -14811,7 +14832,7 @@
 				2C33CC0F20EC340D009956B0 /* Assignment.swift in Sources */,
 				2C949A4420ECCA000049E9A8 /* TooltipDefaultsManager.swift in Sources */,
 				2C949A2E20ECC6C40049E9A8 /* PlaceholderTableViewCell.swift in Sources */,
-				2CA3F56920FF82970041E893 /* LessonPlainObject.swift in Sources */,
+				2CA3F56920FF82970041E893 /* KnowledgeGraphLessonPlainObject.swift in Sources */,
 				2C949A6E20ECD0D10049E9A8 /* AchievementsListTableViewCell.swift in Sources */,
 				2C9499B220ECBAC00049E9A8 /* ChoiceDataset.swift in Sources */,
 				2C33CBFA20EC32B0009956B0 /* AssignmentsAPI.swift in Sources */,
@@ -14958,11 +14979,11 @@
 				2C9499C720ECBC3C0049E9A8 /* DiscussionProxy.swift in Sources */,
 				2C33CBDC20EC2DB4009956B0 /* ApiRequest.swift in Sources */,
 				2C9499DF20ECBDEC0049E9A8 /* StepikURLSessionConfiguration.swift in Sources */,
-				2CA3F56A20FF82970041E893 /* TopicsMapPlainObject.swift in Sources */,
+				2CA3F56A20FF82970041E893 /* KnowledgeGraphTopicsMapPlainObject.swift in Sources */,
 				2C33CC0C20EC33F7009956B0 /* DeleteRequestMaker.swift in Sources */,
 				2C949A0D20ECC4070049E9A8 /* StreaksAlertPresentationManager.swift in Sources */,
 				2C9499DE20ECBDE50049E9A8 /* AlamofireDefaultSessionManager.swift in Sources */,
-				2CA3F56720FF82970041E893 /* GoalPlainObject.swift in Sources */,
+				2CA3F56720FF82970041E893 /* KnowledgeGraphGoalPlainObject.swift in Sources */,
 				2C9499C120ECBB950049E9A8 /* StorageData.swift in Sources */,
 				2CE84BE120F4FD030069B869 /* GraphPathFinder.swift in Sources */,
 				2C9499C620ECBC250049E9A8 /* VideoDownloadDelegate.swift in Sources */,
@@ -15028,10 +15049,11 @@
 				2C949A1920ECC54F0049E9A8 /* StepikTableView.swift in Sources */,
 				2C949A6A20ECD0400049E9A8 /* AchievementDescription.swift in Sources */,
 				2C949A7220ECD1820049E9A8 /* Skeletonable+UIView.swift in Sources */,
-				2CA3F56B20FF82970041E893 /* TopicPlainObject.swift in Sources */,
+				2CA3F56B20FF82970041E893 /* KnowledgeGraphTopicPlainObject.swift in Sources */,
 				2C949A0F20ECC4360049E9A8 /* StepikLabel.swift in Sources */,
 				2C9499EB20ECBFE90049E9A8 /* NotificationRegistrator.swift in Sources */,
 				2C33CBFF20EC3336009956B0 /* AttemptsAPI.swift in Sources */,
+				2C2FD7862107453800609621 /* LessonsServiceImpl.swift in Sources */,
 				2C94999F20ECB9220049E9A8 /* Step+CoreDataProperties.swift in Sources */,
 				2C33CC0220EC334C009956B0 /* NotificationsAPI.swift in Sources */,
 				2CA3F56120FF7C030041E893 /* GraphServiceImpl.swift in Sources */,
@@ -15055,6 +15077,7 @@
 				2CCB5A682100B8E50091A605 /* KnowledgeGraphVertex.swift in Sources */,
 				2C9499E320ECBE860049E9A8 /* StepOptions.swift in Sources */,
 				2C33CBE820EC3160009956B0 /* AnalyticsEvents.swift in Sources */,
+				2C2FD78A2107507200609621 /* LessonPlainObject.swift in Sources */,
 				2C949A5120ECCDD10049E9A8 /* EmailAuthViewController.swift in Sources */,
 				2C94998B20ECB7080049E9A8 /* UIColorExtensions.swift in Sources */,
 				2C9499FE20ECC2530049E9A8 /* PlaybackCommandEntity.swift in Sources */,
@@ -15107,6 +15130,7 @@
 				2CC9955E2105C0AD0023EC0C /* TopicsPresenterTests.swift in Sources */,
 				2CE84BE420F505980069B869 /* GraphPathFinderTests.swift in Sources */,
 				2C6841C420EE14E00050155F /* UserRegistrationServiceTests.swift in Sources */,
+				2C2FD78821074FFD00609621 /* TopicsRouterMock.swift in Sources */,
 				2C8305F720F390F8003D7F9B /* GraphTests.swift in Sources */,
 				2CCB5A642100A5D60091A605 /* GraphServiceMock.swift in Sources */,
 				2C6841CA20EE1F7D0050155F /* ServiceComponentsAssemblyTestsHelper.swift in Sources */,

From 9c35d6dc134e72685f0564766bb36c8c8bcd643b Mon Sep 17 00:00:00 2001
From: Ivan Magda <imagda15@gmail.com>
Date: Tue, 24 Jul 2018 17:19:55 +0300
Subject: [PATCH 04/14] Display lessons

---
 .../RootNavigationManager.swift               | 12 +++-
 .../ServiceComponents.swift                   |  1 +
 .../ServiceComponentsAssembly.swift           |  4 ++
 .../Lessons/Presenter/LessonsPresenter.swift  | 13 +++++
 .../Presenter/LessonsPresenterImpl.swift      | 58 +++++++++++++++++++
 .../LessonTableViewCell.xib                   |  3 +-
 .../LessonsTableViewController.swift          | 28 ++++++++-
 .../Lessons/View/LessonsView.swift            | 19 ++++++
 .../Presenter/TopicsPresenterImpl.swift       | 12 ++--
 Stepic.xcodeproj/project.pbxproj              | 20 +++++++
 10 files changed, 160 insertions(+), 10 deletions(-)
 create mode 100644 ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenter.swift
 create mode 100644 ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
 create mode 100644 ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsView.swift

diff --git a/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift b/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
index 80c6453617..d58e410d7f 100644
--- a/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
+++ b/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
@@ -14,6 +14,7 @@ final class RootNavigationManager {
 
     private unowned let serviceComponents: ServiceComponents
     private weak var navigationController: UINavigationController?
+    private let knowledgeGraph = KnowledgeGraph()
 
     // MARK: Init
 
@@ -27,7 +28,7 @@ final class RootNavigationManager {
         let controller = TopicsTableViewController()
         controller.presenter = TopicsPresenterImpl(
             view: controller,
-            model: KnowledgeGraph(),
+            knowledgeGraph: knowledgeGraph,
             router: self,
             userRegistrationService: serviceComponents.userRegistrationService,
             graphService: serviceComponents.graphService
@@ -45,6 +46,15 @@ final class RootNavigationManager {
 extension RootNavigationManager: TopicsRouter {
     func showLessonsForTopicWithId(_ id: String) {
         let controller = LessonsTableViewController()
+        let presenter = LessonsPresenterImpl(
+            view: controller,
+            topicId: id,
+            knowledgeGraph: knowledgeGraph,
+            lessonsService: serviceComponents.lessonsService
+        )
+        controller.presenter = presenter
+        controller.title = knowledgeGraph[id]?.key.title
+
         navigationController?.pushViewController(controller, animated: true)
     }
 }
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponents.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponents.swift
index 4333e766b4..bbfa769249 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponents.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponents.swift
@@ -11,4 +11,5 @@ import Foundation
 protocol ServiceComponents: class {
     var userRegistrationService: UserRegistrationService { get }
     var graphService: GraphService { get }
+    var lessonsService: LessonsService { get }
 }
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift
index 3623773160..431de41a38 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift
@@ -41,4 +41,8 @@ final class ServiceComponentsAssembly: ServiceComponents {
     var graphService: GraphService {
         return GraphServiceImpl()
     }
+
+    var lessonsService: LessonsService {
+        return LessonsServiceImpl()
+    }
 }
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenter.swift b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenter.swift
new file mode 100644
index 0000000000..6adae8c928
--- /dev/null
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenter.swift
@@ -0,0 +1,13 @@
+//
+//  LessonsPresenter.swift
+//  ExamEGERussian
+//
+//  Created by Ivan Magda on 24/07/2018.
+//  Copyright © 2018 Alex Karpov. All rights reserved.
+//
+
+import Foundation
+
+protocol LessonsPresenter: class {
+    func refresh()
+}
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
new file mode 100644
index 0000000000..c3b9a82710
--- /dev/null
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
@@ -0,0 +1,58 @@
+//
+//  LessonsPresenterImpl.swift
+//  ExamEGERussian
+//
+//  Created by Ivan Magda on 24/07/2018.
+//  Copyright © 2018 Alex Karpov. All rights reserved.
+//
+
+import Foundation
+import PromiseKit
+
+final class LessonsPresenterImpl: LessonsPresenter {
+
+    private weak var view: LessonsView?
+    private let topicId: String
+    private let knowledgeGraph: KnowledgeGraph
+    private var lessons = [LessonPlainObject]()
+    private let lessonsService: LessonsService
+
+    private var lessonsIds: [Int] {
+        guard let topic = knowledgeGraph[topicId]?.key else { return [] }
+        return topic.lessons.filter { $0.type == .theory }.map { $0.id }
+    }
+
+    init(view: LessonsView, topicId: String, knowledgeGraph: KnowledgeGraph,
+         lessonsService: LessonsService) {
+        self.view = view
+        self.topicId = topicId
+        self.knowledgeGraph = knowledgeGraph
+        self.lessonsService = lessonsService
+    }
+
+    func refresh() {
+        fetchLessons()
+    }
+
+    // MARK: - Private API
+
+    private func fetchLessons() {
+        guard lessonsIds.count > 0 else { return }
+        lessonsService.obtainLessons(with: lessonsIds).done { [weak self] responseModel in
+            guard let `self` = self else { return }
+            self.lessons = responseModel
+            let viewData = self.viewLessons(from: self.lessons)
+            self.view?.setLessons(viewData)
+        }.catch { [weak self] error in
+            self?.displayError(error)
+        }
+    }
+
+    private func viewLessons(from lessons: [LessonPlainObject]) -> [LessonsViewData] {
+        return lessons.map { LessonsViewData(id: $0.id, title: $0.title) }
+    }
+
+    private func displayError(_ error: Swift.Error) {
+        view?.displayError(title: NSLocalizedString("Error", comment: ""), message: error.localizedDescription)
+    }
+}
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonTableViewCell/LessonTableViewCell.xib b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonTableViewCell/LessonTableViewCell.xib
index a8aec1d898..0736771c72 100644
--- a/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonTableViewCell/LessonTableViewCell.xib
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonTableViewCell/LessonTableViewCell.xib
@@ -20,13 +20,14 @@
                 <autoresizingMask key="autoresizingMask"/>
                 <subviews>
                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Title" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="JXd-Fv-7te">
-                        <rect key="frame" x="20" y="12" width="33.5" height="21"/>
+                        <rect key="frame" x="20" y="12" width="280" height="21"/>
                         <fontDescription key="fontDescription" type="system" pointSize="17"/>
                         <nil key="textColor"/>
                         <nil key="highlightedColor"/>
                     </label>
                 </subviews>
                 <constraints>
+                    <constraint firstAttribute="trailing" secondItem="JXd-Fv-7te" secondAttribute="trailing" constant="20" symbolic="YES" id="O39-g0-mHv"/>
                     <constraint firstItem="JXd-Fv-7te" firstAttribute="centerY" secondItem="H2p-sc-9uM" secondAttribute="centerY" id="Ows-r2-NpN"/>
                     <constraint firstItem="JXd-Fv-7te" firstAttribute="leading" secondItem="H2p-sc-9uM" secondAttribute="leading" constant="20" symbolic="YES" id="yD4-mM-C7T"/>
                 </constraints>
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift
index a39a4ecfc6..aaf294ed8e 100644
--- a/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift
@@ -10,21 +10,34 @@ import UIKit
 
 final class LessonsTableViewController: UITableViewController {
 
+    // MARK: Instance Properties
+
+    var presenter: LessonsPresenter!
+
+    private var lessons = [LessonsViewData]() {
+        didSet {
+            tableView.reloadData()
+        }
+    }
+
+    // MARK: - UIViewController Lifecycle
+
     override func viewDidLoad() {
         super.viewDidLoad()
 
         tableView.registerNib(for: LessonTableViewCell.self)
+        presenter.refresh()
     }
 
     // MARK: - UITableViewDataSource
 
     override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        return 10
+        return lessons.count
     }
 
     override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
         let cell: LessonTableViewCell = tableView.dequeueReusableCell(for: indexPath)
-        cell.descriptionTitleLabel.text = "Title for row: \(indexPath.row)"
+        cell.descriptionTitleLabel.text = lessons[indexPath.row].title
 
         return cell
     }
@@ -34,5 +47,16 @@ final class LessonsTableViewController: UITableViewController {
     override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
         tableView.deselectRow(at: indexPath, animated: true)
     }
+}
+
+// MARK: - LessonsTableViewController: LessonsView -
 
+extension LessonsTableViewController: LessonsView {
+    func setLessons(_ lessons: [LessonsViewData]) {
+        self.lessons = lessons
+    }
+
+    func displayError(title: String, message: String) {
+        presentAlert(withTitle: title, message: message)
+    }
 }
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsView.swift b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsView.swift
new file mode 100644
index 0000000000..44a51e76f2
--- /dev/null
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsView.swift
@@ -0,0 +1,19 @@
+//
+//  LessonsView.swift
+//  ExamEGERussian
+//
+//  Created by Ivan Magda on 24/07/2018.
+//  Copyright © 2018 Alex Karpov. All rights reserved.
+//
+
+import Foundation
+
+struct LessonsViewData {
+    let id: Int
+    let title: String
+}
+
+protocol LessonsView: class {
+    func setLessons(_ lessons: [LessonsViewData])
+    func displayError(title: String, message: String)
+}
diff --git a/ExamEGERussian/Sources/PresentationLayer/Topics/Presenter/TopicsPresenterImpl.swift b/ExamEGERussian/Sources/PresentationLayer/Topics/Presenter/TopicsPresenterImpl.swift
index fcd939932b..8d7f0bfb8d 100644
--- a/ExamEGERussian/Sources/PresentationLayer/Topics/Presenter/TopicsPresenterImpl.swift
+++ b/ExamEGERussian/Sources/PresentationLayer/Topics/Presenter/TopicsPresenterImpl.swift
@@ -16,14 +16,14 @@ final class TopicsPresenterImpl: TopicsPresenter {
 
     private weak var view: TopicsView?
     private weak var router: TopicsRouter?
-    private var graph: KnowledgeGraph
+    private let knowledgeGraph: KnowledgeGraph
     private let userRegistrationService: UserRegistrationService
     private let graphService: GraphService
 
-    init(view: TopicsView, model: KnowledgeGraph, router: TopicsRouter,
+    init(view: TopicsView, knowledgeGraph: KnowledgeGraph, router: TopicsRouter,
          userRegistrationService: UserRegistrationService, graphService: GraphService) {
         self.view = view
-        self.graph = model
+        self.knowledgeGraph = knowledgeGraph
         self.router = router
         self.userRegistrationService = userRegistrationService
         self.graphService = graphService
@@ -35,7 +35,7 @@ final class TopicsPresenterImpl: TopicsPresenter {
     }
 
     func selectTopic(with viewData: TopicsViewData) {
-        guard let topic = graph[viewData.id]?.key else { return }
+        guard let topic = knowledgeGraph[viewData.id]?.key else { return }
         router?.showLessonsForTopicWithId(topic.id)
     }
 
@@ -56,9 +56,9 @@ final class TopicsPresenterImpl: TopicsPresenter {
             guard let `self` = self else { return }
             let builder = KnowledgeGraphBuilder(graphPlainObject: responseModel)
             guard let graph = builder.build() as? KnowledgeGraph else { return }
-            self.graph = graph
+            self.knowledgeGraph.adjacencies = graph.adjacencies
 
-            let vertices = graph.vertices as! [KnowledgeGraphVertex<String>]
+            let vertices = self.knowledgeGraph.vertices as! [KnowledgeGraphVertex<String>]
             self.view?.setTopics(self.viewTopicsFrom(vertices))
         }.catch { [weak self] error in
             self?.displayError(error)
diff --git a/Stepic.xcodeproj/project.pbxproj b/Stepic.xcodeproj/project.pbxproj
index 7dae9edeb5..8b353306b4 100644
--- a/Stepic.xcodeproj/project.pbxproj
+++ b/Stepic.xcodeproj/project.pbxproj
@@ -1906,6 +1906,9 @@
 		2C2FD7862107453800609621 /* LessonsServiceImpl.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2FD7852107453800609621 /* LessonsServiceImpl.swift */; };
 		2C2FD78821074FFD00609621 /* TopicsRouterMock.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2FD78721074FFD00609621 /* TopicsRouterMock.swift */; };
 		2C2FD78A2107507200609621 /* LessonPlainObject.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2FD7892107507200609621 /* LessonPlainObject.swift */; };
+		2C2FD78D210753AD00609621 /* LessonsPresenter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2FD78C210753AD00609621 /* LessonsPresenter.swift */; };
+		2C2FD78F210753CD00609621 /* LessonsPresenterImpl.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2FD78E210753CD00609621 /* LessonsPresenterImpl.swift */; };
+		2C2FD7912107540500609621 /* LessonsView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C2FD7902107540500609621 /* LessonsView.swift */; };
 		2C315E6D1F0A947D0039E4F0 /* CodeLanguagePickerViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 081BF3461EFEF630002F84AA /* CodeLanguagePickerViewController.swift */; };
 		2C315E6E1F0A947D0039E4F0 /* LessonViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 089984281ECDE188005C0B27 /* LessonViewController.swift */; };
 		2C315E6F1F0A947D0039E4F0 /* LessonPresenter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0899842B1ECDE194005C0B27 /* LessonPresenter.swift */; };
@@ -5598,6 +5601,9 @@
 		2C2FD7852107453800609621 /* LessonsServiceImpl.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LessonsServiceImpl.swift; sourceTree = "<group>"; };
 		2C2FD78721074FFD00609621 /* TopicsRouterMock.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TopicsRouterMock.swift; sourceTree = "<group>"; };
 		2C2FD7892107507200609621 /* LessonPlainObject.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LessonPlainObject.swift; sourceTree = "<group>"; };
+		2C2FD78C210753AD00609621 /* LessonsPresenter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LessonsPresenter.swift; sourceTree = "<group>"; };
+		2C2FD78E210753CD00609621 /* LessonsPresenterImpl.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LessonsPresenterImpl.swift; sourceTree = "<group>"; };
+		2C2FD7902107540500609621 /* LessonsView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LessonsView.swift; sourceTree = "<group>"; };
 		2C33CBDA20EC2C2E009956B0 /* UserRegistrationServiceImplementation.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UserRegistrationServiceImplementation.swift; sourceTree = "<group>"; };
 		2C35C4981F4DA3B6002F3BF4 /* AdaptiveAchievementsPresenter.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AdaptiveAchievementsPresenter.swift; sourceTree = "<group>"; };
 		2C35C4C61F4DA462002F3BF4 /* ru */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; name = ru; path = LeaderboardNames/ru.lproj/adjectives_f.plist; sourceTree = "<group>"; };
@@ -8408,6 +8414,7 @@
 		2C2FD7762107355D00609621 /* Lessons */ = {
 			isa = PBXGroup;
 			children = (
+				2C2FD78B2107539700609621 /* Presenter */,
 				2C2FD7772107357800609621 /* View */,
 			);
 			path = Lessons;
@@ -8418,6 +8425,7 @@
 			children = (
 				2C2FD77C210735AE00609621 /* LessonsTableViewController */,
 				2C2FD781210735EB00609621 /* LessonTableViewCell */,
+				2C2FD7902107540500609621 /* LessonsView.swift */,
 			);
 			path = View;
 			sourceTree = "<group>";
@@ -8449,6 +8457,15 @@
 			path = LessonsService;
 			sourceTree = "<group>";
 		};
+		2C2FD78B2107539700609621 /* Presenter */ = {
+			isa = PBXGroup;
+			children = (
+				2C2FD78C210753AD00609621 /* LessonsPresenter.swift */,
+				2C2FD78E210753CD00609621 /* LessonsPresenterImpl.swift */,
+			);
+			path = Presenter;
+			sourceTree = "<group>";
+		};
 		2C32BAEC1F9636520003DD91 /* Utils */ = {
 			isa = PBXGroup;
 			children = (
@@ -14815,6 +14832,7 @@
 				2C949A5520ECCE270049E9A8 /* UITableView+TableHeaderLayout.swift in Sources */,
 				2C9499D220ECBCDB0049E9A8 /* SortingReply.swift in Sources */,
 				2C9499F020ECC0720049E9A8 /* CodeTemplate+CoreDataProperties.swift in Sources */,
+				2C2FD78D210753AD00609621 /* LessonsPresenter.swift in Sources */,
 				2C94999620ECB86B0049E9A8 /* Assignment+CoreDataProperties.swift in Sources */,
 				2C949A2620ECC60F0049E9A8 /* ProfileHeaderInfoView.swift in Sources */,
 				2CCB5A6021009DB70091A605 /* AbstractGraphBuilder.swift in Sources */,
@@ -14856,6 +14874,7 @@
 				2C9499E720ECBF880049E9A8 /* CodeTemplate.swift in Sources */,
 				2C949A3C20ECC87A0049E9A8 /* Reachability.m in Sources */,
 				2C33CBF020EC325A009956B0 /* RecommendationsAPI.swift in Sources */,
+				2C2FD7912107540500609621 /* LessonsView.swift in Sources */,
 				2C9499CB20ECBCA90049E9A8 /* Submission.swift in Sources */,
 				2C949A3120ECC6FE0049E9A8 /* AchievementsRetriever.swift in Sources */,
 				2C33CC1120EC3420009956B0 /* ContentLanguage.swift in Sources */,
@@ -14883,6 +14902,7 @@
 				2C949A0420ECC3000049E9A8 /* NotificationsMarkAsReadButton.swift in Sources */,
 				2C949A6120ECCF1A0049E9A8 /* ContentLanguagePreferenceTableViewCell.swift in Sources */,
 				2CCB5A55210089180091A605 /* UITableView+Registration.swift in Sources */,
+				2C2FD78F210753CD00609621 /* LessonsPresenterImpl.swift in Sources */,
 				2C33CBFD20EC331E009956B0 /* NotificationStatusesAPI.swift in Sources */,
 				2C949A4A20ECCCAC0049E9A8 /* AuthRoutingManager.swift in Sources */,
 				2C33CBEE20EC3249009956B0 /* UnitsAPI.swift in Sources */,

From 287bd012c761a474df44eecf7149550903a19f4f Mon Sep 17 00:00:00 2001
From: Ivan Magda <imagda15@gmail.com>
Date: Tue, 24 Jul 2018 17:31:38 +0300
Subject: [PATCH 05/14] Handle lesson selection

---
 .../RootNavigationManager.swift               |  9 ++++++++
 .../Lessons/Presenter/LessonsPresenter.swift  |  1 +
 .../Presenter/LessonsPresenterImpl.swift      | 12 +++++++++-
 .../LessonsTableViewController.swift          | 22 +++++++++++++++++++
 4 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift b/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
index d58e410d7f..36a38f643d 100644
--- a/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
+++ b/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
@@ -48,6 +48,7 @@ extension RootNavigationManager: TopicsRouter {
         let controller = LessonsTableViewController()
         let presenter = LessonsPresenterImpl(
             view: controller,
+            router: self,
             topicId: id,
             knowledgeGraph: knowledgeGraph,
             lessonsService: serviceComponents.lessonsService
@@ -58,3 +59,11 @@ extension RootNavigationManager: TopicsRouter {
         navigationController?.pushViewController(controller, animated: true)
     }
 }
+
+// MARK: - RootNavigationManager: LessonsRouter -
+
+extension RootNavigationManager: LessonsRouter {
+    func showStepsForLessonWith(_ id: Int) {
+        print("\(#function) \(id)")
+    }
+}
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenter.swift b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenter.swift
index 6adae8c928..c04c4cf787 100644
--- a/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenter.swift
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenter.swift
@@ -10,4 +10,5 @@ import Foundation
 
 protocol LessonsPresenter: class {
     func refresh()
+    func selectLesson(with viewData: LessonsViewData)
 }
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
index c3b9a82710..294edffaba 100644
--- a/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
@@ -9,9 +9,14 @@
 import Foundation
 import PromiseKit
 
+protocol LessonsRouter: class {
+    func showStepsForLessonWith(_ id: Int)
+}
+
 final class LessonsPresenterImpl: LessonsPresenter {
 
     private weak var view: LessonsView?
+    private weak var router: LessonsRouter?
     private let topicId: String
     private let knowledgeGraph: KnowledgeGraph
     private var lessons = [LessonPlainObject]()
@@ -22,9 +27,10 @@ final class LessonsPresenterImpl: LessonsPresenter {
         return topic.lessons.filter { $0.type == .theory }.map { $0.id }
     }
 
-    init(view: LessonsView, topicId: String, knowledgeGraph: KnowledgeGraph,
+    init(view: LessonsView, router: LessonsRouter, topicId: String, knowledgeGraph: KnowledgeGraph,
          lessonsService: LessonsService) {
         self.view = view
+        self.router = router
         self.topicId = topicId
         self.knowledgeGraph = knowledgeGraph
         self.lessonsService = lessonsService
@@ -34,6 +40,10 @@ final class LessonsPresenterImpl: LessonsPresenter {
         fetchLessons()
     }
 
+    func selectLesson(with viewData: LessonsViewData) {
+        router?.showStepsForLessonWith(viewData.id)
+    }
+
     // MARK: - Private API
 
     private func fetchLessons() {
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift
index aaf294ed8e..09b96738f4 100644
--- a/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/View/LessonsTableViewController/LessonsTableViewController.swift
@@ -17,15 +17,30 @@ final class LessonsTableViewController: UITableViewController {
     private var lessons = [LessonsViewData]() {
         didSet {
             tableView.reloadData()
+            topicsRefreshControl.endRefreshing()
         }
     }
 
+    private lazy var topicsRefreshControl: UIRefreshControl = {
+        let refreshControl = UIRefreshControl()
+        refreshControl.addTarget(self, action: #selector(refreshData(_:)), for: .valueChanged)
+
+        return refreshControl
+    }()
+
     // MARK: - UIViewController Lifecycle
 
     override func viewDidLoad() {
         super.viewDidLoad()
 
         tableView.registerNib(for: LessonTableViewCell.self)
+
+        if #available(iOS 10.0, *) {
+            tableView.refreshControl = topicsRefreshControl
+        } else {
+            tableView.addSubview(topicsRefreshControl)
+        }
+
         presenter.refresh()
     }
 
@@ -46,6 +61,13 @@ final class LessonsTableViewController: UITableViewController {
 
     override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
         tableView.deselectRow(at: indexPath, animated: true)
+        presenter.selectLesson(with: lessons[indexPath.row])
+    }
+
+    // MARK: - Private API
+
+    @objc private func refreshData(_ sender: Any) {
+        presenter.refresh()
     }
 }
 

From 9168ced406bc7628fc209e51f6febc6a7d855f11 Mon Sep 17 00:00:00 2001
From: Ivan Magda <imagda15@gmail.com>
Date: Thu, 26 Jul 2018 13:00:52 +0300
Subject: [PATCH 06/14] Create CourseService

---
 .../AppDelegate/AppDelegate.swift             |  1 +
 .../RootNavigationManager.swift               |  3 +-
 .../ServiceComponents.swift                   |  1 +
 .../ServiceComponentsAssembly.swift           |  7 +++++
 .../CourseService/CourseService.swift         | 25 +++++++++++++++++
 .../CourseService/CourseServiceImpl.swift     | 28 +++++++++++++++++++
 Stepic.xcodeproj/project.pbxproj              | 16 +++++++++++
 7 files changed, 80 insertions(+), 1 deletion(-)
 create mode 100644 ExamEGERussian/Sources/BusinessLogicLayer/Services/CourseService/CourseService.swift
 create mode 100644 ExamEGERussian/Sources/BusinessLogicLayer/Services/CourseService/CourseServiceImpl.swift

diff --git a/ExamEGERussian/Sources/ApplicationLayer/AppDelegate/AppDelegate.swift b/ExamEGERussian/Sources/ApplicationLayer/AppDelegate/AppDelegate.swift
index aafff31620..ef819624a9 100644
--- a/ExamEGERussian/Sources/ApplicationLayer/AppDelegate/AppDelegate.swift
+++ b/ExamEGERussian/Sources/ApplicationLayer/AppDelegate/AppDelegate.swift
@@ -27,6 +27,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
             authAPI: AuthAPI(),
             stepicsAPI: StepicsAPI(),
             profilesAPI: ProfilesAPI(),
+            coursesAPI: CoursesAPI(),
             defaultsStorageManager: DefaultsStorageManager(),
             randomCredentialsGenerator: RandomCredentialsGeneratorImplementation()
         )
diff --git a/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift b/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
index 36a38f643d..56bd6c28b0 100644
--- a/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
+++ b/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
@@ -51,7 +51,8 @@ extension RootNavigationManager: TopicsRouter {
             router: self,
             topicId: id,
             knowledgeGraph: knowledgeGraph,
-            lessonsService: serviceComponents.lessonsService
+            lessonsService: serviceComponents.lessonsService,
+            courseService: serviceComponents.courseService,
         )
         controller.presenter = presenter
         controller.title = knowledgeGraph[id]?.key.title
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponents.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponents.swift
index bbfa769249..af38c53216 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponents.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponents.swift
@@ -12,4 +12,5 @@ protocol ServiceComponents: class {
     var userRegistrationService: UserRegistrationService { get }
     var graphService: GraphService { get }
     var lessonsService: LessonsService { get }
+    var courseService: CourseService { get }
 }
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift
index 431de41a38..c58a830198 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift
@@ -12,18 +12,21 @@ final class ServiceComponentsAssembly: ServiceComponents {
     private let authAPI: AuthAPI
     private let stepicsAPI: StepicsAPI
     private let profilesAPI: ProfilesAPI
+    private let coursesAPI: CoursesAPI
     private let defaultsStorageManager: DefaultsStorageManager
     private let randomCredentialsGenerator: RandomCredentialsGenerator
 
     init(authAPI: AuthAPI,
          stepicsAPI: StepicsAPI,
          profilesAPI: ProfilesAPI,
+         coursesAPI: CoursesAPI,
          defaultsStorageManager: DefaultsStorageManager,
          randomCredentialsGenerator: RandomCredentialsGenerator
         ) {
         self.authAPI = authAPI
         self.stepicsAPI = stepicsAPI
         self.profilesAPI = profilesAPI
+        self.coursesAPI = coursesAPI
         self.defaultsStorageManager = defaultsStorageManager
         self.randomCredentialsGenerator = randomCredentialsGenerator
     }
@@ -45,4 +48,8 @@ final class ServiceComponentsAssembly: ServiceComponents {
     var lessonsService: LessonsService {
         return LessonsServiceImpl()
     }
+
+    var courseService: CourseService {
+        return CourseServiceImpl(coursesAPI: coursesAPI)
+    }
 }
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Services/CourseService/CourseService.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Services/CourseService/CourseService.swift
new file mode 100644
index 0000000000..70d475ddda
--- /dev/null
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Services/CourseService/CourseService.swift
@@ -0,0 +1,25 @@
+//
+//  CourseService.swift
+//  ExamEGERussian
+//
+//  Created by Ivan Magda on 26/07/2018.
+//  Copyright © 2018 Alex Karpov. All rights reserved.
+//
+
+import Foundation
+import PromiseKit
+
+protocol CourseService: class {
+
+    /// Method is used to fetch Course objects from Stepik API
+    ///
+    /// - Parameter ids: Ids Course objects
+    /// - Returns: Promise with a result of an array of Course objects from API.
+    func fetchCourses(with ids: [Int]) -> Promise<[Course]>
+
+    /// Method is used to obtain Course objects from cache with ids
+    ///
+    /// - Parameter ids: Ids Course objects
+    /// - Returns: Promise with a result of an array of Course objects from cache.
+    func obtainCourses(with ids: [Int]) -> Promise<[Course]>
+}
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Services/CourseService/CourseServiceImpl.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Services/CourseService/CourseServiceImpl.swift
new file mode 100644
index 0000000000..3c27a64587
--- /dev/null
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Services/CourseService/CourseServiceImpl.swift
@@ -0,0 +1,28 @@
+//
+//  CourseServiceImpl.swift
+//  ExamEGERussian
+//
+//  Created by Ivan Magda on 26/07/2018.
+//  Copyright © 2018 Alex Karpov. All rights reserved.
+//
+
+import Foundation
+import PromiseKit
+
+final class CourseServiceImpl: CourseService {
+    private let coursesAPI: CoursesAPI
+
+    init(coursesAPI: CoursesAPI) {
+        self.coursesAPI = coursesAPI
+    }
+
+    func fetchCourses(with ids: [Int]) -> Promise<[Course]> {
+        return obtainCourses(with: ids).then { courses in
+            self.coursesAPI.retrieve(ids: ids, existing: courses)
+        }
+    }
+
+    func obtainCourses(with ids: [Int]) -> Promise<[Course]> {
+        return Course.fetchAsync(ids)
+    }
+}
diff --git a/Stepic.xcodeproj/project.pbxproj b/Stepic.xcodeproj/project.pbxproj
index 8b353306b4..704df2042e 100644
--- a/Stepic.xcodeproj/project.pbxproj
+++ b/Stepic.xcodeproj/project.pbxproj
@@ -4019,6 +4019,8 @@
 		2CCB5A642100A5D60091A605 /* GraphServiceMock.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCB5A632100A5D60091A605 /* GraphServiceMock.swift */; };
 		2CCB5A662100B7FA0091A605 /* KnowledgeGraph.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCB5A652100B7FA0091A605 /* KnowledgeGraph.swift */; };
 		2CCB5A682100B8E50091A605 /* KnowledgeGraphVertex.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCB5A672100B8E50091A605 /* KnowledgeGraphVertex.swift */; };
+		2CCC59F12109B3A200564D45 /* CourseService.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCC59F02109B3A200564D45 /* CourseService.swift */; };
+		2CCC59F82109B92300564D45 /* CourseServiceImpl.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCC59F72109B92300564D45 /* CourseServiceImpl.swift */; };
 		2CCD5D2F2029F1D4008ACBC7 /* AnalyticsEvents+Adaptive.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCEB4941F27755800B45D63 /* AnalyticsEvents+Adaptive.swift */; };
 		2CCD5D38202A1898008ACBC7 /* AdaptiveCourseTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCD5D36202A1898008ACBC7 /* AdaptiveCourseTableViewCell.swift */; };
 		2CCD5D3B202A18A5008ACBC7 /* AdaptiveCourseSelectViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCD5D31202A12D5008ACBC7 /* AdaptiveCourseSelectViewController.swift */; };
@@ -5800,6 +5802,8 @@
 		2CCB5A632100A5D60091A605 /* GraphServiceMock.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GraphServiceMock.swift; sourceTree = "<group>"; };
 		2CCB5A652100B7FA0091A605 /* KnowledgeGraph.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = KnowledgeGraph.swift; sourceTree = "<group>"; };
 		2CCB5A672100B8E50091A605 /* KnowledgeGraphVertex.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = KnowledgeGraphVertex.swift; sourceTree = "<group>"; };
+		2CCC59F02109B3A200564D45 /* CourseService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CourseService.swift; sourceTree = "<group>"; };
+		2CCC59F72109B92300564D45 /* CourseServiceImpl.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CourseServiceImpl.swift; sourceTree = "<group>"; };
 		2CCD5D31202A12D5008ACBC7 /* AdaptiveCourseSelectViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AdaptiveCourseSelectViewController.swift; sourceTree = "<group>"; };
 		2CCD5D33202A12E3008ACBC7 /* AdaptiveCourseSelectPresenter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AdaptiveCourseSelectPresenter.swift; sourceTree = "<group>"; };
 		2CCD5D36202A1898008ACBC7 /* AdaptiveCourseTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AdaptiveCourseTableViewCell.swift; sourceTree = "<group>"; };
@@ -8630,6 +8634,7 @@
 		2C59F06320EB9FFA00666EE0 /* Services */ = {
 			isa = PBXGroup;
 			children = (
+				2CCC59EF2109B38400564D45 /* CourseService */,
 				62E9862365BD47119FA0E1D9 /* GraphService */,
 				2C2FD7822107447300609621 /* LessonsService */,
 				2C59F06520EBA26C00666EE0 /* UserRegistrationService */,
@@ -9333,6 +9338,15 @@
 			path = AbstractGraphBuilder;
 			sourceTree = "<group>";
 		};
+		2CCC59EF2109B38400564D45 /* CourseService */ = {
+			isa = PBXGroup;
+			children = (
+				2CCC59F02109B3A200564D45 /* CourseService.swift */,
+				2CCC59F72109B92300564D45 /* CourseServiceImpl.swift */,
+			);
+			path = CourseService;
+			sourceTree = "<group>";
+		};
 		2CCD5D30202A12B3008ACBC7 /* AdaptiveCourseSelect */ = {
 			isa = PBXGroup;
 			children = (
@@ -14889,6 +14903,7 @@
 				2C949A3E20ECC9100049E9A8 /* PickerViewController.swift in Sources */,
 				2CFE247D20ECFC1A00AF1E3D /* Model.xcdatamodeld in Sources */,
 				2C33CC0620EC3385009956B0 /* ApplicationInfo.swift in Sources */,
+				2CCC59F12109B3A200564D45 /* CourseService.swift in Sources */,
 				2CCB5A452100849A0091A605 /* UIViewController+Alert.swift in Sources */,
 				2C9499F220ECC0BA0049E9A8 /* DeleteDeviceExecutableTask.swift in Sources */,
 				2C33CC0D20EC33FF009956B0 /* CreateRequestMaker.swift in Sources */,
@@ -14990,6 +15005,7 @@
 				2CCB5A462100849A0091A605 /* RandomCredentialsGenerator.swift in Sources */,
 				2CCB5A6221009E160091A605 /* KnowledgeGraphBuilder.swift in Sources */,
 				2C949A0320ECC2D70049E9A8 /* NotificationsPresenter.swift in Sources */,
+				2CCC59F82109B92300564D45 /* CourseServiceImpl.swift in Sources */,
 				2C33CC0820EC33CD009956B0 /* User.swift in Sources */,
 				2C949A5920ECCE800049E9A8 /* SettingsViewController.swift in Sources */,
 				2C0BD98920ED321B0022C454 /* RootNavigationManager.swift in Sources */,

From 706b2f344ea07106244b38bca2c434d1e7512c5f Mon Sep 17 00:00:00 2001
From: Ivan Magda <imagda15@gmail.com>
Date: Thu, 26 Jul 2018 13:01:42 +0300
Subject: [PATCH 07/14] Create EnrollmentService

---
 .../AppDelegate/AppDelegate.swift             |  1 +
 .../RootNavigationManager.swift               |  1 +
 .../ServiceComponents.swift                   |  1 +
 .../ServiceComponentsAssembly.swift           |  7 ++++
 .../EnrollmentService/EnrollmentService.swift | 18 +++++++++++
 .../EnrollmentServiceImpl.swift               | 32 +++++++++++++++++++
 Stepic.xcodeproj/project.pbxproj              | 16 ++++++++++
 7 files changed, 76 insertions(+)
 create mode 100644 ExamEGERussian/Sources/BusinessLogicLayer/Services/EnrollmentService/EnrollmentService.swift
 create mode 100644 ExamEGERussian/Sources/BusinessLogicLayer/Services/EnrollmentService/EnrollmentServiceImpl.swift

diff --git a/ExamEGERussian/Sources/ApplicationLayer/AppDelegate/AppDelegate.swift b/ExamEGERussian/Sources/ApplicationLayer/AppDelegate/AppDelegate.swift
index ef819624a9..f04e541187 100644
--- a/ExamEGERussian/Sources/ApplicationLayer/AppDelegate/AppDelegate.swift
+++ b/ExamEGERussian/Sources/ApplicationLayer/AppDelegate/AppDelegate.swift
@@ -28,6 +28,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
             stepicsAPI: StepicsAPI(),
             profilesAPI: ProfilesAPI(),
             coursesAPI: CoursesAPI(),
+            enrollmentsAPI: EnrollmentsAPI(),
             defaultsStorageManager: DefaultsStorageManager(),
             randomCredentialsGenerator: RandomCredentialsGeneratorImplementation()
         )
diff --git a/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift b/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
index 56bd6c28b0..a79e5bb115 100644
--- a/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
+++ b/ExamEGERussian/Sources/ApplicationLayer/RootNavigationManager/RootNavigationManager.swift
@@ -53,6 +53,7 @@ extension RootNavigationManager: TopicsRouter {
             knowledgeGraph: knowledgeGraph,
             lessonsService: serviceComponents.lessonsService,
             courseService: serviceComponents.courseService,
+            enrollmentService: serviceComponents.enrollmentService
         )
         controller.presenter = presenter
         controller.title = knowledgeGraph[id]?.key.title
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponents.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponents.swift
index af38c53216..3faf351be5 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponents.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponents.swift
@@ -13,4 +13,5 @@ protocol ServiceComponents: class {
     var graphService: GraphService { get }
     var lessonsService: LessonsService { get }
     var courseService: CourseService { get }
+    var enrollmentService: EnrollmentService { get }
 }
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift
index c58a830198..13a3161cc1 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift
@@ -13,6 +13,7 @@ final class ServiceComponentsAssembly: ServiceComponents {
     private let stepicsAPI: StepicsAPI
     private let profilesAPI: ProfilesAPI
     private let coursesAPI: CoursesAPI
+    private let enrollmentsAPI: EnrollmentsAPI
     private let defaultsStorageManager: DefaultsStorageManager
     private let randomCredentialsGenerator: RandomCredentialsGenerator
 
@@ -20,6 +21,7 @@ final class ServiceComponentsAssembly: ServiceComponents {
          stepicsAPI: StepicsAPI,
          profilesAPI: ProfilesAPI,
          coursesAPI: CoursesAPI,
+         enrollmentsAPI: EnrollmentsAPI,
          defaultsStorageManager: DefaultsStorageManager,
          randomCredentialsGenerator: RandomCredentialsGenerator
         ) {
@@ -27,6 +29,7 @@ final class ServiceComponentsAssembly: ServiceComponents {
         self.stepicsAPI = stepicsAPI
         self.profilesAPI = profilesAPI
         self.coursesAPI = coursesAPI
+        self.enrollmentsAPI = enrollmentsAPI
         self.defaultsStorageManager = defaultsStorageManager
         self.randomCredentialsGenerator = randomCredentialsGenerator
     }
@@ -52,4 +55,8 @@ final class ServiceComponentsAssembly: ServiceComponents {
     var courseService: CourseService {
         return CourseServiceImpl(coursesAPI: coursesAPI)
     }
+
+    var enrollmentService: EnrollmentService {
+        return EnrollmentServiceImpl(enrollmentsAPI: enrollmentsAPI)
+    }
 }
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Services/EnrollmentService/EnrollmentService.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Services/EnrollmentService/EnrollmentService.swift
new file mode 100644
index 0000000000..d60a37b9e9
--- /dev/null
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Services/EnrollmentService/EnrollmentService.swift
@@ -0,0 +1,18 @@
+//
+//  EnrollmentService.swift
+//  ExamEGERussian
+//
+//  Created by Ivan Magda on 26/07/2018.
+//  Copyright © 2018 Alex Karpov. All rights reserved.
+//
+
+import Foundation
+import PromiseKit
+
+protocol EnrollmentService: class {
+    /// Method is used to joining Course object with specified id.
+    ///
+    /// - Parameter course: Course to join.
+    /// - Returns: Promise when fullfilled.
+    func joinCourse(_ course: Course) -> Promise<Course>
+}
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Services/EnrollmentService/EnrollmentServiceImpl.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Services/EnrollmentService/EnrollmentServiceImpl.swift
new file mode 100644
index 0000000000..fecfa1e401
--- /dev/null
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Services/EnrollmentService/EnrollmentServiceImpl.swift
@@ -0,0 +1,32 @@
+//
+//  EnrollmentServiceImpl.swift
+//  ExamEGERussian
+//
+//  Created by Ivan Magda on 26/07/2018.
+//  Copyright © 2018 Alex Karpov. All rights reserved.
+//
+
+import Foundation
+import PromiseKit
+
+final class EnrollmentServiceImpl: EnrollmentService {
+    private enum EnrollmentServiceError: Error {
+        case joinCourseFailed
+    }
+
+    private let enrollmentsAPI: EnrollmentsAPI
+
+    init(enrollmentsAPI: EnrollmentsAPI) {
+        self.enrollmentsAPI = enrollmentsAPI
+    }
+
+    func joinCourse(_ course: Course) -> Promise<Course> {
+        return Promise { seal in
+            self.enrollmentsAPI.joinCourse(course).done {
+                seal.fulfill(course)
+            }.catch { _ in
+                seal.reject(EnrollmentServiceError.joinCourseFailed)
+            }
+        }
+    }
+}
diff --git a/Stepic.xcodeproj/project.pbxproj b/Stepic.xcodeproj/project.pbxproj
index 704df2042e..21249fc261 100644
--- a/Stepic.xcodeproj/project.pbxproj
+++ b/Stepic.xcodeproj/project.pbxproj
@@ -4021,6 +4021,8 @@
 		2CCB5A682100B8E50091A605 /* KnowledgeGraphVertex.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCB5A672100B8E50091A605 /* KnowledgeGraphVertex.swift */; };
 		2CCC59F12109B3A200564D45 /* CourseService.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCC59F02109B3A200564D45 /* CourseService.swift */; };
 		2CCC59F82109B92300564D45 /* CourseServiceImpl.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCC59F72109B92300564D45 /* CourseServiceImpl.swift */; };
+		2CCC59FC2109BB4800564D45 /* EnrollmentService.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCC59FB2109BB4800564D45 /* EnrollmentService.swift */; };
+		2CCC59FE2109BB9800564D45 /* EnrollmentServiceImpl.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCC59FD2109BB9800564D45 /* EnrollmentServiceImpl.swift */; };
 		2CCD5D2F2029F1D4008ACBC7 /* AnalyticsEvents+Adaptive.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCEB4941F27755800B45D63 /* AnalyticsEvents+Adaptive.swift */; };
 		2CCD5D38202A1898008ACBC7 /* AdaptiveCourseTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCD5D36202A1898008ACBC7 /* AdaptiveCourseTableViewCell.swift */; };
 		2CCD5D3B202A18A5008ACBC7 /* AdaptiveCourseSelectViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2CCD5D31202A12D5008ACBC7 /* AdaptiveCourseSelectViewController.swift */; };
@@ -5804,6 +5806,8 @@
 		2CCB5A672100B8E50091A605 /* KnowledgeGraphVertex.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = KnowledgeGraphVertex.swift; sourceTree = "<group>"; };
 		2CCC59F02109B3A200564D45 /* CourseService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CourseService.swift; sourceTree = "<group>"; };
 		2CCC59F72109B92300564D45 /* CourseServiceImpl.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CourseServiceImpl.swift; sourceTree = "<group>"; };
+		2CCC59FB2109BB4800564D45 /* EnrollmentService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EnrollmentService.swift; sourceTree = "<group>"; };
+		2CCC59FD2109BB9800564D45 /* EnrollmentServiceImpl.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EnrollmentServiceImpl.swift; sourceTree = "<group>"; };
 		2CCD5D31202A12D5008ACBC7 /* AdaptiveCourseSelectViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AdaptiveCourseSelectViewController.swift; sourceTree = "<group>"; };
 		2CCD5D33202A12E3008ACBC7 /* AdaptiveCourseSelectPresenter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AdaptiveCourseSelectPresenter.swift; sourceTree = "<group>"; };
 		2CCD5D36202A1898008ACBC7 /* AdaptiveCourseTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AdaptiveCourseTableViewCell.swift; sourceTree = "<group>"; };
@@ -8635,6 +8639,7 @@
 			isa = PBXGroup;
 			children = (
 				2CCC59EF2109B38400564D45 /* CourseService */,
+				2CCC59FA2109BB3A00564D45 /* EnrollmentService */,
 				62E9862365BD47119FA0E1D9 /* GraphService */,
 				2C2FD7822107447300609621 /* LessonsService */,
 				2C59F06520EBA26C00666EE0 /* UserRegistrationService */,
@@ -9347,6 +9352,15 @@
 			path = CourseService;
 			sourceTree = "<group>";
 		};
+		2CCC59FA2109BB3A00564D45 /* EnrollmentService */ = {
+			isa = PBXGroup;
+			children = (
+				2CCC59FB2109BB4800564D45 /* EnrollmentService.swift */,
+				2CCC59FD2109BB9800564D45 /* EnrollmentServiceImpl.swift */,
+			);
+			path = EnrollmentService;
+			sourceTree = "<group>";
+		};
 		2CCD5D30202A12B3008ACBC7 /* AdaptiveCourseSelect */ = {
 			isa = PBXGroup;
 			children = (
@@ -15101,6 +15115,7 @@
 				2C949A1720ECC5480049E9A8 /* ProfileViewController.swift in Sources */,
 				2CCB5A662100B7FA0091A605 /* KnowledgeGraph.swift in Sources */,
 				2C33CBDB20EC2C2E009956B0 /* UserRegistrationServiceImplementation.swift in Sources */,
+				2CCC59FE2109BB9800564D45 /* EnrollmentServiceImpl.swift in Sources */,
 				2C949A0820ECC3B80049E9A8 /* NotificationDataExtractor.swift in Sources */,
 				2C949A1220ECC4930049E9A8 /* NotificationRequestAlertManager.swift in Sources */,
 				2C949A0620ECC3130049E9A8 /* AlertManager.swift in Sources */,
@@ -15148,6 +15163,7 @@
 				2C9499C220ECBBAF0049E9A8 /* CourseMetainfoEntity.swift in Sources */,
 				2C949A1D20ECC58A0049E9A8 /* MenuUIManager.swift in Sources */,
 				2C949A1C20ECC5690049E9A8 /* NibInitializableView.swift in Sources */,
+				2CCC59FC2109BB4800564D45 /* EnrollmentService.swift in Sources */,
 				2C949A2320ECC5D60049E9A8 /* ProfileDescriptionPresenter.swift in Sources */,
 				2C9499E820ECBF9B0049E9A8 /* NotificationRequestAlertContext.swift in Sources */,
 				2C949A2920ECC62E0049E9A8 /* ProfileAchievementsContentView.swift in Sources */,

From 1925f2636a2f19e2e39e48df38bc648d0dd94c0d Mon Sep 17 00:00:00 2001
From: Ivan Magda <imagda15@gmail.com>
Date: Thu, 26 Jul 2018 13:02:24 +0300
Subject: [PATCH 08/14] Join courses

---
 .../Presenter/LessonsPresenterImpl.swift      | 42 +++++++++++++++++--
 1 file changed, 39 insertions(+), 3 deletions(-)

diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
index 294edffaba..19c505828d 100644
--- a/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
@@ -17,27 +17,40 @@ final class LessonsPresenterImpl: LessonsPresenter {
 
     private weak var view: LessonsView?
     private weak var router: LessonsRouter?
+
     private let topicId: String
     private let knowledgeGraph: KnowledgeGraph
     private var lessons = [LessonPlainObject]()
+
     private let lessonsService: LessonsService
+    private let courseService: CourseService
+    private let enrollmentService: EnrollmentService
 
+    private var topic: KnowledgeGraphVertex<String> {
+        return knowledgeGraph[topicId]!.key
+    }
     private var lessonsIds: [Int] {
-        guard let topic = knowledgeGraph[topicId]?.key else { return [] }
         return topic.lessons.filter { $0.type == .theory }.map { $0.id }
     }
+    private var coursesIds: [Int] {
+        return topic.lessons.compactMap { Int($0.courseId) }
+    }
 
-    init(view: LessonsView, router: LessonsRouter, topicId: String, knowledgeGraph: KnowledgeGraph,
-         lessonsService: LessonsService) {
+    init(view: LessonsView, router: LessonsRouter, topicId: String,
+         knowledgeGraph: KnowledgeGraph, lessonsService: LessonsService,
+         courseService: CourseService, enrollmentService: EnrollmentService) {
         self.view = view
         self.router = router
         self.topicId = topicId
         self.knowledgeGraph = knowledgeGraph
         self.lessonsService = lessonsService
+        self.courseService = courseService
+        self.enrollmentService = enrollmentService
     }
 
     func refresh() {
         fetchLessons()
+        joinCoursesIfNeeded()
     }
 
     func selectLesson(with viewData: LessonsViewData) {
@@ -46,6 +59,29 @@ final class LessonsPresenterImpl: LessonsPresenter {
 
     // MARK: - Private API
 
+    private func joinCoursesIfNeeded() {
+        guard !coursesIds.isEmpty else { return }
+        courseService.obtainCourses(with: coursesIds).then { courses -> Promise<[Int]> in
+            var ids = Set(self.coursesIds)
+            courses.filter { $0.enrolled }.map { $0.id }.forEach { ids.remove($0) }
+            return .value(Array(ids))
+        }.then { ids -> Promise<[Course]> in
+            guard !ids.isEmpty else { return .value([]) }
+            return self.courseService.fetchCourses(with: ids)
+        }.then { courses in
+            when(fulfilled: courses.map { self.joinCourse($0) })
+        }.done { courses in
+            print("Successfully joined courses with ids: \(courses.map { $0.id })")
+        }.catch { [weak self] error in
+            self?.displayError(error)
+        }
+    }
+
+    private func joinCourse(_ course: Course) -> Promise<Course> {
+        guard !course.enrolled else { return .value(course) }
+        return enrollmentService.joinCourse(course)
+    }
+
     private func fetchLessons() {
         guard lessonsIds.count > 0 else { return }
         lessonsService.obtainLessons(with: lessonsIds).done { [weak self] responseModel in

From 0a112d5496e1d86ff4a3ac4942780e5eac604a99 Mon Sep 17 00:00:00 2001
From: Ivan Magda <imagda15@gmail.com>
Date: Thu, 26 Jul 2018 13:05:53 +0300
Subject: [PATCH 09/14] Refactor rename GraphService's obtainGraph() to
 fetchGraph()

---
 .../Services/GraphService/GraphService.swift                 | 5 ++++-
 .../Services/GraphService/GraphServiceImpl.swift             | 2 +-
 .../Topics/Presenter/TopicsPresenterImpl.swift               | 2 +-
 ExamEGERussianTests/Helpers/Mocks/GraphServiceMock.swift     | 2 +-
 4 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Services/GraphService/GraphService.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Services/GraphService/GraphService.swift
index 8773b09d6c..28d8d92875 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Services/GraphService/GraphService.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Services/GraphService/GraphService.swift
@@ -10,5 +10,8 @@ import Foundation
 import PromiseKit
 
 protocol GraphService: class {
-    func obtainGraph() -> Promise<KnowledgeGraphPlainObject>
+    /// Method is used to fetch KnowledgeGraphPlainObject object from API.
+    ///
+    /// - Returns: Promise with a result of KnowledgeGraphPlainObject.
+    func fetchGraph() -> Promise<KnowledgeGraphPlainObject>
 }
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Services/GraphService/GraphServiceImpl.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Services/GraphService/GraphServiceImpl.swift
index e4a3c5494a..9abb89c77c 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Services/GraphService/GraphServiceImpl.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Services/GraphService/GraphServiceImpl.swift
@@ -13,7 +13,7 @@ import Alamofire
 final class GraphServiceImpl: GraphService {
     private static let url = URL(string: "https://www.dropbox.com/s/l8n1wny8qu0gbqt/example.json?dl=1")!
 
-    func obtainGraph() -> Promise<KnowledgeGraphPlainObject> {
+    func fetchGraph() -> Promise<KnowledgeGraphPlainObject> {
         return Alamofire
             .request(GraphServiceImpl.url)
             .responseDecodable(KnowledgeGraphPlainObject.self)
diff --git a/ExamEGERussian/Sources/PresentationLayer/Topics/Presenter/TopicsPresenterImpl.swift b/ExamEGERussian/Sources/PresentationLayer/Topics/Presenter/TopicsPresenterImpl.swift
index 8d7f0bfb8d..06161beeef 100644
--- a/ExamEGERussian/Sources/PresentationLayer/Topics/Presenter/TopicsPresenterImpl.swift
+++ b/ExamEGERussian/Sources/PresentationLayer/Topics/Presenter/TopicsPresenterImpl.swift
@@ -52,7 +52,7 @@ final class TopicsPresenterImpl: TopicsPresenter {
     }
 
     private func fetchGraphData() {
-        graphService.obtainGraph().done { [weak self] responseModel in
+        graphService.fetchGraph().done { [weak self] responseModel in
             guard let `self` = self else { return }
             let builder = KnowledgeGraphBuilder(graphPlainObject: responseModel)
             guard let graph = builder.build() as? KnowledgeGraph else { return }
diff --git a/ExamEGERussianTests/Helpers/Mocks/GraphServiceMock.swift b/ExamEGERussianTests/Helpers/Mocks/GraphServiceMock.swift
index 245fc9f0b8..93183a72e9 100644
--- a/ExamEGERussianTests/Helpers/Mocks/GraphServiceMock.swift
+++ b/ExamEGERussianTests/Helpers/Mocks/GraphServiceMock.swift
@@ -17,7 +17,7 @@ final class GraphServiceMock: GraphService {
 
     var resultToBeReturned: Promise<KnowledgeGraphPlainObject> = Promise(error: Error.mockError)
 
-    func obtainGraph() -> Promise<KnowledgeGraphPlainObject> {
+    func fetchGraph() -> Promise<KnowledgeGraphPlainObject> {
         return resultToBeReturned
     }
 }

From 96e81167d347c5cbe8bebc47b623df03f6bc1b4b Mon Sep 17 00:00:00 2001
From: Ivan Magda <imagda15@gmail.com>
Date: Thu, 26 Jul 2018 13:09:48 +0300
Subject: [PATCH 10/14] Refactor rename LessonsService's obtainLessons() to
 fetchLessons()

---
 .../Services/LessonsService/LessonsService.swift            | 6 +++++-
 .../Services/LessonsService/LessonsServiceImpl.swift        | 2 +-
 .../Lessons/Presenter/LessonsPresenterImpl.swift            | 2 +-
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsService.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsService.swift
index 4b1ea21a1a..7b9e6980f9 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsService.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsService.swift
@@ -10,5 +10,9 @@ import Foundation
 import PromiseKit
 
 protocol LessonsService: class {
-    func obtainLessons(with ids: [Int]) -> Promise<[LessonPlainObject]>
+    /// Method is used to fetch lessons from Stepik API.
+    ///
+    /// - Parameter ids: Lessons ids.
+    /// - Returns: Promise with an array of LessonPlainObjects.
+    func fetchLessons(with ids: [Int]) -> Promise<[LessonPlainObject]>
 }
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsServiceImpl.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsServiceImpl.swift
index 8980cbd4e6..d82128727b 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsServiceImpl.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsServiceImpl.swift
@@ -15,7 +15,7 @@ final class LessonsServiceImpl: LessonsService {
         let lessons: [LessonPlainObject]
     }
 
-    func obtainLessons(with ids: [Int]) -> Promise<[LessonPlainObject]> {
+    func fetchLessons(with ids: [Int]) -> Promise<[LessonPlainObject]> {
         let url = "\(StepicApplicationsInfo.apiURL)/lessons"
         let parameters = ["ids": ids]
         let headers = AuthInfo.shared.initialHTTPHeaders
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
index 19c505828d..efd3fbdaed 100644
--- a/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
@@ -84,7 +84,7 @@ final class LessonsPresenterImpl: LessonsPresenter {
 
     private func fetchLessons() {
         guard lessonsIds.count > 0 else { return }
-        lessonsService.obtainLessons(with: lessonsIds).done { [weak self] responseModel in
+        lessonsService.fetchLessons(with: lessonsIds).done { [weak self] responseModel in
             guard let `self` = self else { return }
             self.lessons = responseModel
             let viewData = self.viewLessons(from: self.lessons)

From 7e0759fa26ccb17ab4933023b7080f30db5227e9 Mon Sep 17 00:00:00 2001
From: Ivan Magda <imagda15@gmail.com>
Date: Thu, 26 Jul 2018 14:09:13 +0300
Subject: [PATCH 11/14] Support cache in LessonsService

---
 .../AppDelegate/AppDelegate.swift             |  1 +
 .../ServiceComponentsAssembly.swift           |  5 +-
 .../CourseService/CourseService.swift         |  2 -
 .../LessonsService/LessonsService.swift       |  5 ++
 .../LessonsService/LessonsServiceImpl.swift   | 51 ++++++++++++++-----
 .../Presenter/LessonsPresenterImpl.swift      | 27 +++++++---
 6 files changed, 68 insertions(+), 23 deletions(-)

diff --git a/ExamEGERussian/Sources/ApplicationLayer/AppDelegate/AppDelegate.swift b/ExamEGERussian/Sources/ApplicationLayer/AppDelegate/AppDelegate.swift
index f04e541187..59d6b2349c 100644
--- a/ExamEGERussian/Sources/ApplicationLayer/AppDelegate/AppDelegate.swift
+++ b/ExamEGERussian/Sources/ApplicationLayer/AppDelegate/AppDelegate.swift
@@ -29,6 +29,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
             profilesAPI: ProfilesAPI(),
             coursesAPI: CoursesAPI(),
             enrollmentsAPI: EnrollmentsAPI(),
+            lessonsAPI: LessonsAPI(),
             defaultsStorageManager: DefaultsStorageManager(),
             randomCredentialsGenerator: RandomCredentialsGeneratorImplementation()
         )
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift
index 13a3161cc1..d0f1244314 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Assemblies/ServiceComponentsAssembly/ServiceComponentsAssembly.swift
@@ -14,6 +14,7 @@ final class ServiceComponentsAssembly: ServiceComponents {
     private let profilesAPI: ProfilesAPI
     private let coursesAPI: CoursesAPI
     private let enrollmentsAPI: EnrollmentsAPI
+    private let lessonsAPI: LessonsAPI
     private let defaultsStorageManager: DefaultsStorageManager
     private let randomCredentialsGenerator: RandomCredentialsGenerator
 
@@ -22,6 +23,7 @@ final class ServiceComponentsAssembly: ServiceComponents {
          profilesAPI: ProfilesAPI,
          coursesAPI: CoursesAPI,
          enrollmentsAPI: EnrollmentsAPI,
+         lessonsAPI: LessonsAPI,
          defaultsStorageManager: DefaultsStorageManager,
          randomCredentialsGenerator: RandomCredentialsGenerator
         ) {
@@ -30,6 +32,7 @@ final class ServiceComponentsAssembly: ServiceComponents {
         self.profilesAPI = profilesAPI
         self.coursesAPI = coursesAPI
         self.enrollmentsAPI = enrollmentsAPI
+        self.lessonsAPI = lessonsAPI
         self.defaultsStorageManager = defaultsStorageManager
         self.randomCredentialsGenerator = randomCredentialsGenerator
     }
@@ -49,7 +52,7 @@ final class ServiceComponentsAssembly: ServiceComponents {
     }
 
     var lessonsService: LessonsService {
-        return LessonsServiceImpl()
+        return LessonsServiceImpl(lessonsAPI: lessonsAPI)
     }
 
     var courseService: CourseService {
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Services/CourseService/CourseService.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Services/CourseService/CourseService.swift
index 70d475ddda..1385c60ee8 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Services/CourseService/CourseService.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Services/CourseService/CourseService.swift
@@ -10,13 +10,11 @@ import Foundation
 import PromiseKit
 
 protocol CourseService: class {
-
     /// Method is used to fetch Course objects from Stepik API
     ///
     /// - Parameter ids: Ids Course objects
     /// - Returns: Promise with a result of an array of Course objects from API.
     func fetchCourses(with ids: [Int]) -> Promise<[Course]>
-
     /// Method is used to obtain Course objects from cache with ids
     ///
     /// - Parameter ids: Ids Course objects
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsService.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsService.swift
index 7b9e6980f9..24d4926772 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsService.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsService.swift
@@ -15,4 +15,9 @@ protocol LessonsService: class {
     /// - Parameter ids: Lessons ids.
     /// - Returns: Promise with an array of LessonPlainObjects.
     func fetchLessons(with ids: [Int]) -> Promise<[LessonPlainObject]>
+    /// Method is used to obtain lessons from cache.
+    ///
+    /// - Parameter ids: Lessons ids.
+    /// - Returns: Promise with an array of cached LessonPlainObjects.
+    func obtainLessons(with ids: [Int]) -> Promise<[LessonPlainObject]>
 }
diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsServiceImpl.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsServiceImpl.swift
index d82128727b..7d4b096ca7 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsServiceImpl.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Services/LessonsService/LessonsServiceImpl.swift
@@ -7,25 +7,50 @@
 //
 
 import Foundation
+import CoreData
 import PromiseKit
-import Alamofire
 
 final class LessonsServiceImpl: LessonsService {
-    private struct Response: Codable {
-        let lessons: [LessonPlainObject]
+    private let lessonsAPI: LessonsAPI
+
+    init(lessonsAPI: LessonsAPI) {
+        self.lessonsAPI = lessonsAPI
     }
 
     func fetchLessons(with ids: [Int]) -> Promise<[LessonPlainObject]> {
-        let url = "\(StepicApplicationsInfo.apiURL)/lessons"
-        let parameters = ["ids": ids]
-        let headers = AuthInfo.shared.initialHTTPHeaders
-
-        return firstly {
-            Alamofire
-                .request(url, parameters: parameters, headers: headers)
-                .responseDecodable(Response.self)
-        }.then { response in
-            Promise.value(response.lessons)
+        return executeFetchRequest(ids: ids)
+            .then { self.lessonsAPI.retrieve(ids: ids, existing: $0) }
+            .mapValues { self.toPlainObject($0) }
+    }
+
+    func obtainLessons(with ids: [Int]) -> Promise<[LessonPlainObject]> {
+        return executeFetchRequest(ids: ids).mapValues { self.toPlainObject($0) }
+    }
+
+    // MARK: - Private API
+
+    private func executeFetchRequest(ids: [Int]) -> Promise<[Lesson]> {
+        let request = NSFetchRequest<NSFetchRequestResult>(entityName: String(describing: Lesson.self))
+        let descriptor = NSSortDescriptor(key: "managedId", ascending: true)
+
+        let idPredicates = ids.map { NSPredicate(format: "managedId == %@", $0 as NSNumber) }
+        let predicate = NSCompoundPredicate(type: NSCompoundPredicate.LogicalType.or, subpredicates: idPredicates)
+        request.predicate = predicate
+        request.sortDescriptors = [descriptor]
+
+        return Promise<[Lesson]> { seal in
+            let asyncRequest = NSAsynchronousFetchRequest(fetchRequest: request, completionBlock: { results in
+                guard let lessons = results.finalResult as? [Lesson] else {
+                    seal.fulfill([])
+                    return
+                }
+                seal.fulfill(lessons)
+            })
+            _ = try? CoreDataHelper.instance.context.execute(asyncRequest)
         }
     }
+
+    private func toPlainObject(_ lesson: Lesson) -> LessonPlainObject {
+        return LessonPlainObject(id: lesson.id, steps: lesson.steps.map { $0.id }, title: lesson.title)
+    }
 }
diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
index efd3fbdaed..dda5b4b54f 100644
--- a/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
@@ -20,7 +20,11 @@ final class LessonsPresenterImpl: LessonsPresenter {
 
     private let topicId: String
     private let knowledgeGraph: KnowledgeGraph
-    private var lessons = [LessonPlainObject]()
+    private var lessons = [LessonPlainObject]() {
+        didSet {
+            self.view?.setLessons(viewLessons(from: lessons))
+        }
+    }
 
     private let lessonsService: LessonsService
     private let courseService: CourseService
@@ -49,7 +53,11 @@ final class LessonsPresenterImpl: LessonsPresenter {
     }
 
     func refresh() {
-        fetchLessons()
+        if lessons.isEmpty {
+            obtainLessonsFromCache()
+        } else {
+            fetchLessons()
+        }
         joinCoursesIfNeeded()
     }
 
@@ -82,13 +90,18 @@ final class LessonsPresenterImpl: LessonsPresenter {
         return enrollmentService.joinCourse(course)
     }
 
+    private func obtainLessonsFromCache() {
+        lessonsService.obtainLessons(with: lessonsIds).done { [weak self] lessons in
+            self?.lessons = lessons
+        }.catch { [weak self] error in
+            self?.displayError(error)
+        }
+    }
+
     private func fetchLessons() {
         guard lessonsIds.count > 0 else { return }
-        lessonsService.fetchLessons(with: lessonsIds).done { [weak self] responseModel in
-            guard let `self` = self else { return }
-            self.lessons = responseModel
-            let viewData = self.viewLessons(from: self.lessons)
-            self.view?.setLessons(viewData)
+        lessonsService.fetchLessons(with: lessonsIds).done { [weak self] lessons in
+            self?.lessons = lessons
         }.catch { [weak self] error in
             self?.displayError(error)
         }

From febb2838c6beecfc900f4ddd0be97b02b50afa4e Mon Sep 17 00:00:00 2001
From: Ivan Magda <imagda15@gmail.com>
Date: Thu, 26 Jul 2018 14:11:27 +0300
Subject: [PATCH 12/14] Fix tests

---
 .../ServiceComponentsAssemblyTestsHelper.swift               | 5 +++--
 .../TopicsModuleTests/TopicsPresenterTests.swift             | 2 +-
 .../TopicsModuleTests/TopicsTableViewControllerTests.swift   | 2 +-
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/ExamEGERussianTests/AssembliesTests/ServiceComponentsAssemblyTests/ServiceComponentsAssemblyTestsHelper.swift b/ExamEGERussianTests/AssembliesTests/ServiceComponentsAssemblyTests/ServiceComponentsAssemblyTestsHelper.swift
index 64a847eed3..dc389dd8e5 100644
--- a/ExamEGERussianTests/AssembliesTests/ServiceComponentsAssemblyTests/ServiceComponentsAssemblyTestsHelper.swift
+++ b/ExamEGERussianTests/AssembliesTests/ServiceComponentsAssemblyTests/ServiceComponentsAssemblyTestsHelper.swift
@@ -10,7 +10,6 @@ import Foundation
 @testable import ExamEGERussian
 
 final class ServiceComponentsAssemblyTestsHelper {
-
     let serviceComponents: ServiceComponents
 
     init() {
@@ -18,9 +17,11 @@ final class ServiceComponentsAssemblyTestsHelper {
             authAPI: AuthAPI(),
             stepicsAPI: StepicsAPI(),
             profilesAPI: ProfilesAPI(),
+            coursesAPI: CoursesAPI(),
+            enrollmentsAPI: EnrollmentsAPI(),
+            lessonsAPI: LessonsAPI(),
             defaultsStorageManager: DefaultsStorageManager(),
             randomCredentialsGenerator: RandomCredentialsGeneratorImplementation()
         )
     }
-
 }
diff --git a/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsPresenterTests.swift b/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsPresenterTests.swift
index fc1087576a..83a92cfbdd 100644
--- a/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsPresenterTests.swift
+++ b/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsPresenterTests.swift
@@ -22,7 +22,7 @@ class TopicsPresenterTests: XCTestCase {
 
         topicsPresenter = TopicsPresenterImpl(
             view: topicsViewSpy,
-            model: KnowledgeGraph(),
+            knowledgeGraph: KnowledgeGraph(),
             router: TopicsRouterMock(),
             userRegistrationService: userRegistrationService,
             graphService: graphService
diff --git a/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsTableViewControllerTests.swift b/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsTableViewControllerTests.swift
index e92053f14e..c0e7641faf 100644
--- a/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsTableViewControllerTests.swift
+++ b/ExamEGERussianTests/PresentationTests/TopicsModuleTests/TopicsTableViewControllerTests.swift
@@ -15,7 +15,7 @@ class TopicsTableViewControllerTests: XCTestCase {
         let vc = TopicsTableViewController()
         let presenter = TopicsPresenterImpl(
             view: vc,
-            model: KnowledgeGraph(),
+            knowledgeGraph: KnowledgeGraph(),
             router: TopicsRouterMock(),
             userRegistrationService: UserRegistrationServiceMock(),
             graphService: GraphServiceMock()

From 711f19bf6bc15392fc6f04e788a5e1e3b733c56d Mon Sep 17 00:00:00 2001
From: Ivan Magda <imagda15@gmail.com>
Date: Mon, 30 Jul 2018 12:32:54 +0300
Subject: [PATCH 13/14] EnrollmentServiceImpl simplify call to joinCourse(:)

---
 .../EnrollmentService/EnrollmentServiceImpl.swift    | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/ExamEGERussian/Sources/BusinessLogicLayer/Services/EnrollmentService/EnrollmentServiceImpl.swift b/ExamEGERussian/Sources/BusinessLogicLayer/Services/EnrollmentService/EnrollmentServiceImpl.swift
index fecfa1e401..c86d543330 100644
--- a/ExamEGERussian/Sources/BusinessLogicLayer/Services/EnrollmentService/EnrollmentServiceImpl.swift
+++ b/ExamEGERussian/Sources/BusinessLogicLayer/Services/EnrollmentService/EnrollmentServiceImpl.swift
@@ -10,10 +10,6 @@ import Foundation
 import PromiseKit
 
 final class EnrollmentServiceImpl: EnrollmentService {
-    private enum EnrollmentServiceError: Error {
-        case joinCourseFailed
-    }
-
     private let enrollmentsAPI: EnrollmentsAPI
 
     init(enrollmentsAPI: EnrollmentsAPI) {
@@ -21,12 +17,8 @@ final class EnrollmentServiceImpl: EnrollmentService {
     }
 
     func joinCourse(_ course: Course) -> Promise<Course> {
-        return Promise { seal in
-            self.enrollmentsAPI.joinCourse(course).done {
-                seal.fulfill(course)
-            }.catch { _ in
-                seal.reject(EnrollmentServiceError.joinCourseFailed)
-            }
+        return enrollmentsAPI.joinCourse(course).then { _ -> Promise<Course> in
+            .value(course)
         }
     }
 }

From 07a7c1f33ae30ef21795a23aa6c156728306800d Mon Sep 17 00:00:00 2001
From: Ivan Magda <imagda15@gmail.com>
Date: Mon, 30 Jul 2018 12:34:07 +0300
Subject: [PATCH 14/14] Update guard statements style

---
 .../Presenter/LessonsPresenterImpl.swift      | 21 +++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
index dda5b4b54f..ffc2384908 100644
--- a/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
+++ b/ExamEGERussian/Sources/PresentationLayer/Lessons/Presenter/LessonsPresenterImpl.swift
@@ -68,13 +68,20 @@ final class LessonsPresenterImpl: LessonsPresenter {
     // MARK: - Private API
 
     private func joinCoursesIfNeeded() {
-        guard !coursesIds.isEmpty else { return }
+        guard !coursesIds.isEmpty else {
+            return
+        }
+
         courseService.obtainCourses(with: coursesIds).then { courses -> Promise<[Int]> in
             var ids = Set(self.coursesIds)
             courses.filter { $0.enrolled }.map { $0.id }.forEach { ids.remove($0) }
+
             return .value(Array(ids))
         }.then { ids -> Promise<[Course]> in
-            guard !ids.isEmpty else { return .value([]) }
+            guard !ids.isEmpty else {
+                return .value([])
+            }
+
             return self.courseService.fetchCourses(with: ids)
         }.then { courses in
             when(fulfilled: courses.map { self.joinCourse($0) })
@@ -86,7 +93,10 @@ final class LessonsPresenterImpl: LessonsPresenter {
     }
 
     private func joinCourse(_ course: Course) -> Promise<Course> {
-        guard !course.enrolled else { return .value(course) }
+        guard !course.enrolled else {
+            return .value(course)
+        }
+
         return enrollmentService.joinCourse(course)
     }
 
@@ -99,7 +109,10 @@ final class LessonsPresenterImpl: LessonsPresenter {
     }
 
     private func fetchLessons() {
-        guard lessonsIds.count > 0 else { return }
+        guard lessonsIds.count > 0 else {
+            return
+        }
+
         lessonsService.fetchLessons(with: lessonsIds).done { [weak self] lessons in
             self?.lessons = lessons
         }.catch { [weak self] error in