Story improvements

Stepic/ApplicationInfo.swift

@@ -65,6 +65,9 @@ class ApplicationInfo {
         struct Modules {
             static let tabs = "modules.tabs"
         }
+        struct Versions {
+            static let stories = "versions.stories"
+        }
     }
 
     private var settings: NSDictionary?

Stepic/Config.plist

@@ -2,6 +2,11 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>versions</key>
+	<dict>
+		<key>stories</key>
+		<integer>1</integer>
+	</dict>
 	<key>modules</key>
 	<dict>
 		<key>tabs</key>

Stepic/StepicApplicationsInfo.swift

@@ -87,4 +87,9 @@ struct StepicApplicationsInfo {
     struct Modules {
         static let tabs = StepicApplicationsInfo.stepikConfigDic?.get(for: Root.Modules.tabs) as? [String]
     }
+
+    // Section: Versions
+    struct Versions {
+        static let stories = StepicApplicationsInfo.stepikConfigDic?.get(for: Root.Versions.stories) as? Int
+    }
 }

Stepic/StoriesPresenter.swift

@@ -65,13 +65,15 @@ class StoriesPresenter: StoriesPresenterProtocol {
     func refresh() {
         view?.set(state: .loading)
 
-        storyTemplatesAPI.retrieve(isPublished: true, language: ContentLanguage.sharedContentLanguage).done { [weak self] stories, _ in
+        storyTemplatesAPI.retrieve(isPublished: true, language: ContentLanguage.sharedContentLanguage, maxVersion: StepicApplicationsInfo.Versions.stories ?? 0).done { [weak self] stories, _ in
             guard let strongSelf = self else {
                 return
             }
             strongSelf.stories = stories.filter {
                 strongSelf.isSupported(story: $0)
             }.sorted(by: {
+                $0.position >= $1.position
+            }).sorted(by: {
                  !($0.isViewed.value) || ($1.isViewed.value)
             })
             strongSelf.view?.set(state: strongSelf.stories.isEmpty ? .empty : .normal)

Stepic/Story.swift

@@ -16,13 +16,15 @@ class Story: JSONSerializable {
         self.title = json["title"].stringValue
         self.parts = json["parts"].arrayValue.map { StoryPart(json: $0) }
         self.isViewed = CachedValue<Bool>(key: "isViewed_id\(id)", defaultValue: false)
+        self.position = json["position"].intValue
     }
 
     var id: Int
     var coverPath: String
     var title: String
     var isViewed: CachedValue<Bool>
     var parts: [StoryPart]
+    var position: Int
 
     required init(json: JSON) {
         self.id = json["id"].intValue
@@ -32,6 +34,7 @@ class Story: JSONSerializable {
         self.parts = json["parts"].arrayValue.compactMap {
             Story.buildStoryPart(json: $0)
         }
+        self.position = json["position"].intValue
     }
 
     private static func buildStoryPart(json: JSON) -> StoryPart? {

Stepic/StoryTemplatesAPI.swift

@@ -13,12 +13,13 @@ import Alamofire
 class StoryTemplatesAPI: APIEndpoint {
     override var name: String { return "story-templates" }
 
-    func retrieve(isPublished: Bool, language: ContentLanguage, page: Int = 1) -> Promise<([Story], Meta)> {
+    func retrieve(isPublished: Bool, language: ContentLanguage, maxVersion: Int, page: Int = 1) -> Promise<([Story], Meta)> {
         return Promise { seal in
             let params: Parameters = [
                 "is_published": isPublished ? "true" : "false",
                 "page": page,
-                "language": language.languageString
+                "language": language.languageString,
+                "max_version": maxVersion
             ]
 
             retrieve.request(