Add chat example

RiotSwiftUI/Modules/Template/TemplateAdvancedRoomsExample/TemplateRoomChat/ViewModel/TemplateRoomChatViewModel.swift

@@ -0,0 +1,110 @@
+// 
+// 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 SwiftUI
+import Combine
+    
+@available(iOS 14.0, *)
+class TemplateRoomChatViewModel: ObservableObject, TemplateRoomChatViewModelProtocol {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+    private let templateRoomChatService: TemplateRoomChatServiceProtocol
+    private var cancellables = Set<AnyCancellable>()
+    
+    // MARK: Public
+    @Published var input: TemplateRoomChatViewModelInput
+    @Published private(set) var viewState: TemplateRoomChatViewState
+    
+    var completion: ((TemplateRoomChatViewModelResult) -> Void)?
+    
+    // MARK: - Setup
+    init(templateRoomChatService: TemplateRoomChatServiceProtocol, initialState: TemplateRoomChatViewState? = nil) {
+        self.input = TemplateRoomChatViewModelInput(messageInput: "")
+        self.templateRoomChatService = templateRoomChatService
+        self.viewState = initialState ?? Self.defaultState(templateRoomChatService: templateRoomChatService)
+        
+        templateRoomChatService.chatMessagesSubject
+            .map(Self.makeBubbles(messages:))
+            .map(TemplateRoomChatStateAction.updateBubbles)
+            .receive(on: DispatchQueue.main)
+            .sink(receiveValue: { [weak self] action in
+                self?.dispatch(action:action)
+            })
+            .store(in: &cancellables)
+    }
+    
+    private static func defaultState(templateRoomChatService: TemplateRoomChatServiceProtocol) -> TemplateRoomChatViewState {
+        let bubbles = makeBubbles(messages: templateRoomChatService.chatMessagesSubject.value)
+        return TemplateRoomChatViewState(bubbles: bubbles)
+    }
+    
+    private static func makeBubbles(messages: [TemplateRoomChatMessage]) -> [TemplateRoomChatBubble] {
+        
+        
+        messages.enumerated().forEach { i, message in
+            let currentMessage = messages[i]
+            if i > 0 {
+                let lastMessage = messages[i-1]
+            } else {
+                TemplateRoomChatBubble(
+                    id: message.,
+                    avatar: <#T##AvatarInputProtocol#>,
+                    displayName: <#T##String?#>,
+                    items: <#T##[TemplateRoomChatBubbleItem]#>
+                )
+            }
+        }
+    }
+    
+    // MARK: - Public
+    func process(viewAction: TemplateRoomChatViewAction) {
+        switch viewAction {
+        case .cancel:
+            cancel()
+        case .done:
+            done()
+        }
+    }
+    
+    // MARK: - Private
+    /**
+     Send state actions to mutate the state.
+     */
+    private func dispatch(action: TemplateRoomChatStateAction) {
+        Self.reducer(state: &self.viewState, action: action)
+    }
+    
+    /**
+     A redux style reducer, all modifications to state happen here. Receives a state and a state action and produces a new state.
+     */
+    private static func reducer(state: inout TemplateRoomChatViewState, action: TemplateRoomChatStateAction) {
+        switch action {
+        case .updateBubbles(let bubbles):
+            state.bubbles = bubbles
+        }
+        UILog.debug("[TemplateRoomChatViewModel] reducer with action \(action) produced state: \(state)")
+    }
+    
+    private func done() {
+        completion?(.done)
+    }
+    
+    private func cancel() {
+        completion?(.cancel)
+    }
+}

RiotSwiftUI/Modules/Template/TemplateAdvancedRoomsExample/TemplateRoomChat/ViewModel/TemplateRoomChatViewModelProtocol.swift

@@ -0,0 +1,21 @@
+// 
+// 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
+
+protocol TemplateRoomChatViewModelProtocol {
+    var completion: ((TemplateRoomChatViewModelResult) -> Void)? { get set }
+}