Implement leave

Riot/Modules/Room/RoomInfo/RoomInfoList/RoomInfoListCoordinator.swift

@@ -66,6 +66,10 @@ extension RoomInfoListCoordinator: RoomInfoListViewModelCoordinatorDelegate {
     func roomInfoListViewModel(_ viewModel: RoomInfoListViewModelType, wantsToNavigate viewController: UIViewController) {
         self.delegate?.roomInfoListCoordinator(self, wantsToNavigate: viewController)
     }
+    
+    func roomInfoListViewModel(_ viewModel: RoomInfoListViewModelType, wantsToPresent viewController: UIViewController) {
+        self.delegate?.roomInfoListCoordinator(self, wantsToPresent: viewController)
+    }
 
     func roomInfoListViewModelDidCancel(_ viewModel: RoomInfoListViewModelType) {
         self.delegate?.roomInfoListCoordinatorDidCancel(self)

Riot/Modules/Room/RoomInfo/RoomInfoList/RoomInfoListCoordinatorType.swift

@@ -20,6 +20,7 @@ import Foundation
 
 protocol RoomInfoListCoordinatorDelegate: class {
     func roomInfoListCoordinator(_ coordinator: RoomInfoListCoordinatorType, wantsToNavigate viewController: UIViewController)
+    func roomInfoListCoordinator(_ coordinator: RoomInfoListCoordinatorType, wantsToPresent viewController: UIViewController)
     func roomInfoListCoordinatorDidCancel(_ coordinator: RoomInfoListCoordinatorType)
 }
 

Riot/Modules/Room/RoomInfo/RoomInfoList/RoomInfoListViewAction.swift

@@ -28,5 +28,6 @@ enum RoomInfoListTarget {
 enum RoomInfoListViewAction {
     case loadData
     case navigate(target: RoomInfoListTarget)
+    case leave
     case cancel
 }

Riot/Modules/Room/RoomInfo/RoomInfoList/RoomInfoListViewController.swift

@@ -152,7 +152,7 @@ final class RoomInfoListViewController: UIViewController {
                                footer: nil)
         
         let row_3_0 = Row(type: .destructive, icon: Asset.Images.roomActionLeave.image, text: VectorL10n.roomParticipantsLeavePromptTitle, accessoryType: .none) {
-            //  no-op
+            self.viewModel.process(viewAction: .leave)
         }
         let section3 = Section(header: nil,
                                rows: [row_3_0],

Riot/Modules/Room/RoomInfo/RoomInfoList/RoomInfoListViewModel.swift

@@ -67,6 +67,29 @@ final class RoomInfoListViewModel: NSObject, RoomInfoListViewModelType {
         return controller
     }()
     
+    private lazy var leaveAlertController: UIAlertController = {
+        let controller = UIAlertController(title: VectorL10n.roomParticipantsLeavePromptTitle, message: VectorL10n.roomParticipantsLeavePromptMsg, preferredStyle: .alert)
+        
+        controller.addAction(UIAlertAction(title: VectorL10n.cancel, style: .cancel, handler: nil))
+        controller.addAction(UIAlertAction(title: VectorL10n.leave, style: .default, handler: { [weak self] (action) in
+            guard let self = self else { return }
+            self.stopObservingSummaryChanges()
+            self.update(viewState: .loading)
+            self.room.leave { (response) in
+                switch response {
+                case .success:
+                    self.coordinatorDelegate?.roomInfoListViewModelDidCancel(self)
+                case .failure(let error):
+                    self.startObservingSummaryChanges()
+                    self.update(viewState: .error(error))
+                }
+            }
+        }))
+        controller.mxk_setAccessibilityIdentifier("RoomSettingsVCLeaveAlert")
+        
+        return controller
+    }()
+    
     // MARK: Public
 
     weak var viewDelegate: RoomInfoListViewModelViewDelegate?
@@ -91,11 +114,11 @@ final class RoomInfoListViewModel: NSObject, RoomInfoListViewModelType {
         self.session = session
         self.room = room
         super.init()
-        NotificationCenter.default.addObserver(self, selector: #selector(roomSummaryUpdated(_:)), name: .mxRoomSummaryDidChange, object: room.summary)
+        startObservingSummaryChanges()
     }
     
     deinit {
-        NotificationCenter.default.removeObserver(self)
+        stopObservingSummaryChanges()
     }
     
     // MARK: - Public
@@ -106,6 +129,8 @@ final class RoomInfoListViewModel: NSObject, RoomInfoListViewModelType {
             self.loadData()
         case .navigate(let target):
             self.navigate(to: target)
+        case .leave:
+            self.leave()
         case .cancel:
             self.coordinatorDelegate?.roomInfoListViewModelDidCancel(self)
         }
@@ -113,6 +138,14 @@ final class RoomInfoListViewModel: NSObject, RoomInfoListViewModelType {
     
     // MARK: - Private
     
+    private func startObservingSummaryChanges() {
+        NotificationCenter.default.addObserver(self, selector: #selector(roomSummaryUpdated(_:)), name: .mxRoomSummaryDidChange, object: room.summary)
+    }
+    
+    private func stopObservingSummaryChanges() {
+        NotificationCenter.default.removeObserver(self, name: .mxRoomSummaryDidChange, object: nil)
+    }
+    
     @objc private func roomSummaryUpdated(_ notification: Notification) {
         //  force update view
         self.update(viewState: .loaded)
@@ -139,6 +172,10 @@ final class RoomInfoListViewModel: NSObject, RoomInfoListViewModelType {
         }
     }
     
+    private func leave() {
+        self.coordinatorDelegate?.roomInfoListViewModel(self, wantsToPresent: leaveAlertController)
+    }
+    
     private func update(viewState: RoomInfoListViewState) {
         self.viewDelegate?.roomInfoListViewModel(self, didUpdateViewState: viewState)
     }

Riot/Modules/Room/RoomInfo/RoomInfoList/RoomInfoListViewModelType.swift

@@ -25,6 +25,7 @@ protocol RoomInfoListViewModelViewDelegate: class {
 protocol RoomInfoListViewModelCoordinatorDelegate: class {
     func roomInfoListViewModelDidCancel(_ viewModel: RoomInfoListViewModelType)
     func roomInfoListViewModel(_ viewModel: RoomInfoListViewModelType, wantsToNavigate viewController: UIViewController)
+    func roomInfoListViewModel(_ viewModel: RoomInfoListViewModelType, wantsToPresent viewController: UIViewController)
 }
 
 /// Protocol describing the view model used by `RoomInfoListViewController`