Extract and start to split theme.

Riot/ModulesSwiftUI/Room/NotificationSettings/ViewModel/RoomNotificationSettingsViewModel.swift

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+// File created from ScreenTemplate
+// $ createScreen.sh Room/NotificationSettings RoomNotificationSettings
+/*
+ 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
+import Combine
+
+class RoomNotificationSettingsViewModel: RoomNotificationSettingsViewModelType {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+    
+    private let roomNotificationService: RoomNotificationSettingsServiceType
+    var state: RoomNotificationSettingsViewState {
+        willSet {
+            update(viewState: newValue)
+        }
+    }
+
+    // MARK: Public
+    
+    weak var viewDelegate: RoomNotificationSettingsViewModelViewDelegate?
+    
+    weak var coordinatorDelegate: RoomNotificationSettingsViewModelCoordinatorDelegate?
+    
+    // MARK: - Setup
+    
+    init(
+        roomNotificationService: RoomNotificationSettingsServiceType,
+        initialState: RoomNotificationSettingsViewState
+    ) {
+        self.roomNotificationService = roomNotificationService
+        self.state = initialState
+        
+        self.roomNotificationService.observeNotificationState { [weak self] state in
+            guard let self = self else { return }
+            self.state.notificationState = Self.mapNotificationStateOnRead(encrypted: self.state.roomEncrypted, state: state)
+        }
+    }
+    
+    convenience init(
+        roomNotificationService: RoomNotificationSettingsServiceType,
+        avatarData: AvatarType?,
+        displayName: String?,
+        roomEncrypted: Bool
+    ) {
+        let notificationState = Self.mapNotificationStateOnRead(encrypted: roomEncrypted, state: roomNotificationService.notificationState)
+        
+        let initialState = RoomNotificationSettingsViewState(
+            roomEncrypted: roomEncrypted,
+            saving: false,
+            notificationState: notificationState,
+            avatarData: avatarData,
+            displayName: displayName
+        )
+        self.init(roomNotificationService: roomNotificationService, initialState: initialState)
+    }
+    
+    // MARK: - Public 
+    
+    func process(viewAction: RoomNotificationSettingsViewAction) {
+        switch viewAction {
+        case .load:
+            update(viewState: self.state)
+        case .selectNotificationState(let state):
+            self.state.notificationState = state
+        case .save:
+            self.state.saving = true
+            roomNotificationService.update(state: state.notificationState) { [weak self] in
+                guard let self = self else { return }
+                self.state.saving = false
+                self.coordinatorDelegate?.roomNotificationSettingsViewModelDidComplete(self)
+            }
+        case .cancel:
+            coordinatorDelegate?.roomNotificationSettingsViewModelDidCancel(self)
+        }
+    }
+    
+    // MARK: - Private
+    
+    private static func mapNotificationStateOnRead(encrypted: Bool, state: RoomNotificationState) -> RoomNotificationState {
+        if encrypted, case .mentionsAndKeywordsOnly = state {
+            // Notifications not supported on encrypted rooms, map mentionsOnly to mute on read
+            return .mute
+        } else {
+            return state
+        }
+    }
+    
+    func update(viewState: RoomNotificationSettingsViewState) {
+        self.viewDelegate?.roomNotificationSettingsViewModel(self, didUpdateViewState: viewState)
+    }
+}