Add iOS message date grouping

apps/ios/TeleTuiIOS/Sources/TeleTuiIOSCore/Views.swift

@@ -365,8 +365,12 @@ public struct ChatDetailView: View {
                             }
                         }
                         Section {
-                            ForEach(viewModel.messages) { message in
-                                MessageRow(message: message)
+                            ForEach(Array(viewModel.messages.enumerated()), id: \.element.id) { index, message in
+                                if shouldShowDateSeparator(at: index) {
+                                    DateSeparatorView(timestamp: message.date)
+                                        .listRowSeparator(.hidden)
+                                }
+                                MessageRow(message: message, showsSender: shouldShowSender(at: index))
                                     .id(message.id)
                                     .contextMenu {
                                         Button {
@@ -507,6 +511,76 @@ public struct ChatDetailView: View {
             }
         )
     }
+
+    private func shouldShowDateSeparator(at index: Int) -> Bool {
+        guard viewModel.messages.indices.contains(index), viewModel.messages[index].date > 0 else {
+            return false
+        }
+        guard index > 0, viewModel.messages.indices.contains(index - 1) else {
+            return true
+        }
+        let current = Date(timeIntervalSince1970: TimeInterval(viewModel.messages[index].date))
+        let previous = Date(timeIntervalSince1970: TimeInterval(viewModel.messages[index - 1].date))
+        return !Calendar.current.isDate(current, inSameDayAs: previous)
+    }
+
+    private func shouldShowSender(at index: Int) -> Bool {
+        guard viewModel.messages.indices.contains(index) else {
+            return true
+        }
+        let message = viewModel.messages[index]
+        guard !message.isOutgoing else {
+            return false
+        }
+        guard index > 0, viewModel.messages.indices.contains(index - 1) else {
+            return true
+        }
+        let previous = viewModel.messages[index - 1]
+        return previous.isOutgoing
+            || previous.senderName != message.senderName
+            || shouldShowDateSeparator(at: index)
+    }
+}
+
+public struct DateSeparatorView: View {
+    public var timestamp: Int32
+
+    public init(timestamp: Int32) {
+        self.timestamp = timestamp
+    }
+
+    public var body: some View {
+        HStack {
+            Spacer()
+            Text(label)
+                .font(.caption)
+                .foregroundStyle(.secondary)
+                .padding(.horizontal, 10)
+                .padding(.vertical, 4)
+                .background(Color.gray.opacity(0.12), in: Capsule())
+            Spacer()
+        }
+        .padding(.vertical, 6)
+    }
+
+    private var label: String {
+        let date = Date(timeIntervalSince1970: TimeInterval(timestamp))
+        let calendar = Calendar.current
+        if calendar.isDateInToday(date) {
+            return "Today"
+        }
+        if calendar.isDateInYesterday(date) {
+            return "Yesterday"
+        }
+        return Self.formatter.string(from: date)
+    }
+
+    private static let formatter: DateFormatter = {
+        let formatter = DateFormatter()
+        formatter.dateStyle = .medium
+        formatter.timeStyle = .none
+        return formatter
+    }()
 }
 
 public struct PinnedMessagesBar: View {
@@ -554,9 +628,11 @@ public struct PinnedMessagesBar: View {
 
 public struct MessageRow: View {
     public var message: Message
+    public var showsSender: Bool
 
-    public init(message: Message) {
+    public init(message: Message, showsSender: Bool = true) {
         self.message = message
+        self.showsSender = showsSender
     }
 
     public var body: some View {
@@ -565,7 +641,7 @@ public struct MessageRow: View {
                 Spacer(minLength: 48)
             }
             VStack(alignment: .leading, spacing: 5) {
-                if !message.isOutgoing {
+                if showsSender && !message.isOutgoing {
                     Text(message.senderName)
                         .font(.caption)
                         .foregroundStyle(.secondary)
@@ -587,8 +663,11 @@ public struct MessageRow: View {
                     Text(message.reactions.map(\.emoji).joined(separator: " "))
                         .font(.caption)
                 }
-                if message.editDate != nil || message.isOutgoing {
+                if message.editDate != nil || message.date > 0 || message.isOutgoing {
                     HStack(spacing: 6) {
+                        if message.date > 0 {
+                            Text(Self.timeFormatter.string(from: Date(timeIntervalSince1970: TimeInterval(message.date))))
+                        }
                         if message.editDate != nil {
                             Text("edited")
                         }
@@ -618,6 +697,13 @@ public struct MessageRow: View {
             )
         ) ?? AttributedString(message.text)
     }
+
+    private static let timeFormatter: DateFormatter = {
+        let formatter = DateFormatter()
+        formatter.dateStyle = .none
+        formatter.timeStyle = .short
+        return formatter
+    }()
 }
 
 public struct ComposeBar: View {