Local push notifications

Stepic.xcodeproj/project.pbxproj

@@ -869,6 +869,7 @@
 		2C315E6F1F0A947D0039E4F0 /* LessonPresenter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0899842B1ECDE194005C0B27 /* LessonPresenter.swift */; };
 		2C315E701F0A947D0039E4F0 /* LessonView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0899842E1ECDE19E005C0B27 /* LessonView.swift */; };
 		2C315E711F0A947D0039E4F0 /* PagerController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 08C1943F1ED0A05D00A41B72 /* PagerController.swift */; };
+		2C4DA9E91F38729500E392FA /* LocalNotificationsHelper.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C4DA9E81F38729500E392FA /* LocalNotificationsHelper.swift */; };
 		2C5F48D71F0F6FBD00C3A398 /* AdaptiveStepPresenter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C5F48D51F0F6ED800C3A398 /* AdaptiveStepPresenter.swift */; };
 		2C5F48DB1F0FA0A500C3A398 /* AdaptiveStepsPresenter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C5F48D91F0FA04300C3A398 /* AdaptiveStepsPresenter.swift */; };
 		2C5F6BA91F20B2A900C251D3 /* CongratulationViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2C5F6BA71F20B2A900C251D3 /* CongratulationViewController.swift */; };
@@ -1843,6 +1844,7 @@
 		2C04C1091F16075A006B69B3 /* en */ = {isa = PBXFileReference; lastKnownFileType = text.html; name = en; path = en.lproj/step3.html; sourceTree = "<group>"; };
 		2C04C10A1F16075D006B69B3 /* en */ = {isa = PBXFileReference; lastKnownFileType = text.html; name = en; path = en.lproj/step2.html; sourceTree = "<group>"; };
 		2C04C10B1F16075F006B69B3 /* en */ = {isa = PBXFileReference; lastKnownFileType = text.html; name = en; path = en.lproj/step1.html; sourceTree = "<group>"; };
+		2C4DA9E81F38729500E392FA /* LocalNotificationsHelper.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = LocalNotificationsHelper.swift; sourceTree = "<group>"; };
 		2C5F48D51F0F6ED800C3A398 /* AdaptiveStepPresenter.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AdaptiveStepPresenter.swift; sourceTree = "<group>"; };
 		2C5F48D91F0FA04300C3A398 /* AdaptiveStepsPresenter.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AdaptiveStepsPresenter.swift; sourceTree = "<group>"; };
 		2C5F6BA71F20B2A900C251D3 /* CongratulationViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CongratulationViewController.swift; sourceTree = "<group>"; };
@@ -3484,6 +3486,7 @@
 				2C76ACCC1F16496C0077D9D7 /* RatingHelper.swift */,
 				2CCEB4941F27755800B45D63 /* AnalyticsEvents+Adaptive.swift */,
 				2C733C391F29E090000E7FAF /* StatsHelper.swift */,
+				2C4DA9E81F38729500E392FA /* LocalNotificationsHelper.swift */,
 			);
 			name = Helpers;
 			sourceTree = "<group>";
@@ -5370,6 +5373,7 @@
 				0805FE461F0D390B001226B4 /* CodePlaygroundManager.swift in Sources */,
 				864D66AB1E83DE03001E8D9E /* Scripts.swift in Sources */,
 				864D66AC1E83DE03001E8D9E /* Scripts.plist in Sources */,
+				2C4DA9E91F38729500E392FA /* LocalNotificationsHelper.swift in Sources */,
 				864D66AD1E83DE03001E8D9E /* Constants.swift in Sources */,
 				864D66AE1E83DE03001E8D9E /* Images.swift in Sources */,
 				864D66B01E83DE03001E8D9E /* ApplicationInfo.swift in Sources */,

Stepic/en.lproj/Localizable.strings

@@ -249,4 +249,8 @@ NewLevelCongratulationShareText = "I've reached level %@ in %@ app. Join and bea
 NewLevelCongratulationText = "You've reached level %@!";
 RatingCongratulationText = "Correct! +%@ XP";
 ShareAchievement = "Share achievement";
+RetentionNotificationYesterday = "You scored %@ XP yesterday. Go back and improve your score!";
+RetentionNotificationYesterdayZero = "You didn't score any points for yesterday. Improve your score today!";
+RetentionNotificationYesterdayStreak = "You have been learning %@ in a row. Go back and keep learning!";
+RetentionNotificationWeekly = "You haven't done it for a long time. Go back and keep learning!";
 SocialSignupWithExistingEmail = "This email is already used. To log in using this social account you have to log in via email and password";

Stepic/ru.lproj/Localizable.strings

@@ -250,4 +250,8 @@ NewLevelCongratulationShareText = "Я достиг %@ уровня в прило
 NewLevelCongratulationText = "Вы достигли %@ уровня!";
 RatingCongratulationText = "Правильно! +%@ опыта";
 ShareAchievement = "Поделиться достижением";
+RetentionNotificationYesterday = "Вчера Вы набрали %@ опыта. Возвращайтесь и улучшите свой результат!";
+RetentionNotificationYesterdayZero = "За вчерашний день Вы ничего не решили. Улучшите свой результат сегодня!";
+RetentionNotificationYesterdayStreak = "Вы занимаетесь уже %@ подряд. Возвращайтесь и продолжайте учиться!";
+RetentionNotificationWeekly = "Вы давно не занимались. Возвращайтесь и продолжайте учиться!";
 SocialSignupWithExistingEmail = "Указанный email привязан к другому аккаунту. Чтобы входить через эту социальную сеть, необходимо войти, используя email и пароль";

StepicAdaptiveCourse/AdaptiveAppDelegate.swift

@@ -28,12 +28,26 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
             DefaultsContainer.launch.didLaunch = true
         }
 
+        LocalNotificationsHelper.registerNotifications()
+
+        if let launchNotification = launchOptions?[UIApplicationLaunchOptionsKey.localNotification] as? UILocalNotification {
+            if let userInfo = launchNotification.userInfo as? [String: String], let notificationType = userInfo["type"] {
+                AnalyticsReporter.reportEvent(AnalyticsEvents.Adaptive.localNotification, parameters: ["type": notificationType])
+            }
+        }
+
         return true
     }
 
     func applicationWillResignActive(_ application: UIApplication) {
-        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
-        // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
+        LocalNotificationsHelper.schedule(notification: .tomorrow)
+        LocalNotificationsHelper.schedule(notification: .weekly)
+    }
+
+    func application(_ application: UIApplication, didReceive notification: UILocalNotification) {
+        if let userInfo = notification.userInfo as? [String: String], let notificationType = userInfo["type"] {
+            AnalyticsReporter.reportEvent(AnalyticsEvents.Adaptive.localNotification, parameters: ["type": notificationType])
+        }
     }
 
     func applicationDidEnterBackground(_ application: UIApplication) {
@@ -46,7 +60,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
     }
 
     func applicationDidBecomeActive(_ application: UIApplication) {
-        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
+        LocalNotificationsHelper.cancelAllNotifications()
     }
 
     func applicationWillTerminate(_ application: UIApplication) {

StepicAdaptiveCourse/AnalyticsEvents+Adaptive.swift

@@ -25,5 +25,6 @@ extension AnalyticsEvents {
             static let easy = "adaptive_reaction_easy"
             static let hard = "adaptive_reaction_hard"
         }
+        static let localNotification = "adaptive_opened_by_local_notification"
     }
 }

StepicAdaptiveCourse/LocalNotificationsHelper.swift

@@ -0,0 +1,88 @@
+//
+//  LocalNotificationsHelper.swift
+//  Stepic
+//
+//  Created by Vladislav Kiryukhin on 07.08.2017.
+//  Copyright © 2017 Alex Karpov. All rights reserved.
+//
+
+import UIKit
+
+enum LocalNotification {
+    case tomorrow, weekly
+
+    var fireDate: Date {
+        switch self {
+        case .tomorrow:
+            return Date(timeIntervalSinceNow: 24 * 60 * 60)
+        case .weekly:
+            return Date(timeIntervalSinceNow: 2 * 24 * 60 * 60)
+        }
+    }
+
+    var repeatInterval: NSCalendar.Unit {
+        switch self {
+        case .tomorrow:
+            return NSCalendar.Unit(rawValue: 0)
+        case .weekly:
+            return NSCalendar.Unit.weekOfYear
+        }
+    }
+
+    var notification: UILocalNotification {
+        let localNotification = UILocalNotification()
+        localNotification.soundName = UILocalNotificationDefaultSoundName
+        localNotification.repeatInterval = self.repeatInterval
+        localNotification.fireDate = self.fireDate
+
+        switch self {
+        case .tomorrow:
+            let streak = StatsHelper.currentDayStreak
+            if streak == 0 {
+                // 0 points today, 0 points prev
+                localNotification.alertBody = NSLocalizedString("RetentionNotificationYesterdayZero", comment: "")
+                localNotification.userInfo = ["type": "yesterday_zero"]
+            } else if streak == 1 {
+                // X points today, 0 points prev
+                if let todayXP = StatsHelper.loadStats()?[StatsHelper.dayByDate(Date())] {
+                    localNotification.alertBody = String(format: NSLocalizedString("RetentionNotificationYesterday", comment: ""), "\(todayXP)")
+                    localNotification.userInfo = ["type": "yesterday"]
+                }
+            } else {
+                // X points today, X points prev
+                var streakDays = "\(streak) "
+                switch (streak % 10) {
+                case 1: streakDays += NSLocalizedString("days1", comment: "")
+                case 2, 3, 4: streakDays += NSLocalizedString("days234", comment: "")
+                default: streakDays += NSLocalizedString("days567890", comment: "")
+                }
+
+                localNotification.alertBody = String(format: NSLocalizedString("RetentionNotificationYesterdayStreak", comment: ""), "\(streakDays)")
+                localNotification.userInfo = ["type": "yesterday_streak"]
+            }
+        case .weekly:
+            localNotification.alertBody = NSLocalizedString("RetentionNotificationWeekly", comment: "")
+            localNotification.userInfo = ["type": "weekly"]
+        }
+
+        return localNotification
+    }
+}
+
+class LocalNotificationsHelper {
+    static func cancelAllNotifications() {
+        print("local notifications: cancelled all")
+        UIApplication.shared.cancelAllLocalNotifications()
+    }
+
+    static func schedule(notification: LocalNotification) {
+        print("local notifications: scheduled notification with fire date = \(notification.fireDate)")
+        UIApplication.shared.scheduleLocalNotification(notification.notification)
+    }
+
+    static func registerNotifications() {
+        let settings: UIUserNotificationSettings =
+            UIUserNotificationSettings(types: [.alert, .badge, .sound], categories: nil)
+        UIApplication.shared.registerUserNotificationSettings(settings)
+    }
+}

StepicAdaptiveCourse/StatsHelper.swift

@@ -15,13 +15,27 @@ class StatsHelper {
 
     private static let secondsInDay: TimeInterval = 24 * 60 * 60
 
-    private static func dayByDate(_ date: Date) -> Int {
+    static var currentDayStreak: Int {
+        get {
+            var curDay = StatsHelper.dayByDate(Date())
+            while curDay > 0 {
+                if let todayXP = StatsHelper.loadStats()?[curDay], todayXP != 0 {
+                    curDay -= 1
+                } else {
+                    break
+                }
+            }
+            return StatsHelper.dayByDate(Date()) - curDay
+        }
+    }
+
+    static func dayByDate(_ date: Date) -> Int {
         // Day num (01.01.1970 - 0, 02.01.1970 - 1, ...)
         let dayNum = Int(date.timeIntervalSince1970 / secondsInDay)
         return dayNum
     }
 
-    private static func dateByDay(_ day: Int) -> Date {
+    static func dateByDay(_ day: Int) -> Date {
         // 00:00 am target day
         let date = Date(timeIntervalSince1970: secondsInDay * Double(day))
         return date