ShowDirectory: Update view model and handle direct input of room id alias even non public.

Riot/Modules/Rooms/ShowDirectory/PublicRoomsDirectoryViewModel.swift

@@ -0,0 +1,69 @@
+// 
+// Copyright 2021 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+class PublicRoomsDirectoryViewModel {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+    
+    private let dataSource: PublicRoomsDirectoryDataSource
+    private let session: MXSession
+     
+    // MARK: Public
+    
+    var roomsCount: Int {
+        return Int(dataSource.roomsCount)
+    }
+    
+    var directoryServerDisplayname: String? {
+        return dataSource.directoryServerDisplayname
+    }
+    
+    // MARK: - Setup
+    
+    init(dataSource: PublicRoomsDirectoryDataSource, session: MXSession) {
+        self.dataSource = dataSource
+        self.session = session
+    }
+    
+    // MARK: - Public
+    
+    func roomViewModel(at row: Int) -> DirectoryRoomTableViewCellVM? {
+        self.roomViewModel(at: IndexPath(row: row, section: 0))
+    }
+    
+    func roomViewModel(at indexPath: IndexPath) -> DirectoryRoomTableViewCellVM? {
+        guard let publicRoom = dataSource.room(at: indexPath) else { return nil }
+        return self.roomCellViewModel(with: publicRoom)
+    }
+    
+    // MARK: - Private
+    
+    private func roomCellViewModel(with publicRoom: MXPublicRoom) -> DirectoryRoomTableViewCellVM {
+        let summary = session.roomSummary(withRoomId: publicRoom.roomId)
+        
+        return DirectoryRoomTableViewCellVM(title: publicRoom.displayname(),
+                                            numberOfUsers: publicRoom.numJoinedMembers,
+                                            subtitle: MXTools.stripNewlineCharacters(publicRoom.topic),
+                                            isJoined: summary?.membership == .join,
+                                            roomId: publicRoom.roomId,
+                                            avatarUrl: publicRoom.avatarUrl,
+                                            mediaManager: session.mediaManager)
+    }
+}