Edits: Start history

2026-04-20 00:24:43 +02:00 · 2019-06-28 18:16:27 +02:00
parent 1ebb1fc77c
commit 7a0a5f81e0
12 changed files with 753 additions and 0 deletions
@@ -0,0 +1,128 @@
+// File created from ScreenTemplate
+// $ createScreen.sh Room/EditHistory EditHistory
+/*
+ Copyright 2019 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
+
+final class EditHistoryViewModel: EditHistoryViewModelType {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+
+    private let aggregations: MXAggregations
+    private let roomId: String
+    private let eventId: String
+    private let messageFormattingQueue: DispatchQueue
+
+    private var nextBatch: String?
+    
+    // MARK: Public
+    
+    var messages: [EditHistoryMessage] = []
+    var operation: MXHTTPOperation?
+
+    weak var viewDelegate: EditHistoryViewModelViewDelegate?
+    weak var coordinatorDelegate: EditHistoryViewModelCoordinatorDelegate?
+    
+    
+    // MARK: - Setup
+    
+    init(aggregations: MXAggregations,
+         roomId: String,
+         eventId: String) {
+        self.aggregations = aggregations
+        self.roomId = roomId
+        self.eventId = eventId
+        self.messageFormattingQueue = DispatchQueue(label: "\(type(of: self)).messageFormattingQueue")
+    }
+    
+    deinit {
+    }
+    
+    // MARK: - Public
+    
+    func process(viewAction: EditHistoryViewAction) {
+        switch viewAction {
+        case .loadMore:
+            self.loadMoreHistory()
+        case .close:
+            self.coordinatorDelegate?.editHistoryViewModelDidClose(self)
+        }
+    }
+    
+    // MARK: - Private
+    
+    func loadMoreHistory() {
+        if self.operation != nil {
+            print("[EditHistoryViewModel] loadMoreHistory: operation already pending")
+            return
+        }
+
+        self.update(viewState: .loading)
+        self.operation = self.aggregations.replaceEvents(forEvent: self.eventId, inRoom: self.roomId, from: self.nextBatch, limit: 10, success: { [weak self] (response) in
+            guard let sself = self else {
+                return
+            }
+
+            sself.nextBatch = response.nextBatch
+            sself.operation = nil
+
+            sself.process(editEvents: response.chunk)
+
+            }, failure: { [weak self] error in
+                guard let sself = self else {
+                    return
+                }
+
+                sself.operation = nil
+                sself.update(viewState: .error(error))
+        })
+    }
+
+    func process(editEvents: [MXEvent]) {
+        self.messageFormattingQueue.async {
+            
+            let newMessages = editEvents.reversed()
+                .compactMap { (editEvent) -> EditHistoryMessage? in
+                    return self.process(editEvent: editEvent)
+            }
+
+            if newMessages.count > 0 {
+                DispatchQueue.main.async {
+                    self.messages = newMessages + self.messages
+                    self.update(viewState: .loaded(messages: self.messages, addedCount: newMessages.count))
+                }
+            }
+        }
+    }
+
+    func process(editEvent: MXEvent) -> EditHistoryMessage? {
+
+        guard let body: String = (editEvent.content?["m.new_content"] as? [String: Any])?["body"] as? String else {
+            print("[EditHistoryViewModel] processEditEvent: invalid edit event: \(editEvent.eventId ?? "")")
+            return nil
+        }
+
+        // TODO: Using MXKEventFormatter
+        return EditHistoryMessage(date: Date(), message: NSAttributedString(string: body))
+    }
+    
+    private func update(viewState: EditHistoryViewState) {
+        self.viewDelegate?.editHistoryViewModel(self, didUpdateViewState: viewState)
+    }
+}