Adds getting/sending messages

kordophone2/App.swift

@@ -11,19 +11,33 @@ import SwiftUI
 struct KordophoneApp: App
 {
     @State var conversationListModel = ConversationListView.ViewModel()
+    @State var transcriptViewModel = ChatTranscriptView.ViewModel()
+    @State var entryViewModel = MessageEntryView.ViewModel()
     
     private let xpcClient = XPCClient()
+    private var selectedConversation: Display.Conversation? {
+        guard let id = conversationListModel.selectedConversations.first else { return nil }
+        return conversationListModel.conversations.first { $0.id == id }
+    }
     
     var body: some Scene {
         WindowGroup {
             NavigationSplitView {
                 ConversationListView(model: $conversationListModel)
                     .frame(minWidth: 330.0)
+                    .xpcClient(xpcClient)
                     .task {
                         await refreshConversations()
                     }
             } detail: {
-                // Detail
+                ConversationView(transcriptModel: $transcriptViewModel, entryModel: $entryViewModel)
+                    .xpcClient(xpcClient)
+                    .selectedConversation(selectedConversation)
+                    .navigationTitle("Kordophone")
+                    .navigationSubtitle(selectedConversation?.displayName ?? "")
+                    .onChange(of: conversationListModel.selectedConversations) { oldValue, newValue in
+                        transcriptViewModel.displayedConversation = newValue.first
+                    }
             }
         }
     }
@@ -42,3 +56,21 @@ struct KordophoneApp: App
         print("Error: \(e.localizedDescription)")
     }
 }
+
+extension EnvironmentValues
+{
+    @Entry var xpcClient: XPCClient = XPCClient()
+    @Entry var selectedConversation: Display.Conversation? = nil
+}
+
+extension View
+{
+    func xpcClient(_ client: XPCClient) -> some View {
+        environment(\.xpcClient, client)
+    }
+    
+    func selectedConversation(_ convo: Display.Conversation?) -> some View {
+        environment(\.selectedConversation, convo)
+    }
+}
+

kordophone2/ChatTranscriptView.swift

@@ -5,3 +5,127 @@
 //  Created by James Magahern on 8/24/25.
 //
 
+import SwiftUI
+
+struct ChatTranscriptView: View
+{
+    @Binding var model: ViewModel
+    
+    var body: some View {
+        ScrollView {
+            LazyVStack(spacing: 17.0) {
+                ForEach($model.messages.reversed()) { message in
+                    MessageCellView(message: message)
+                        .id(message.id)
+                        .scaleEffect(CGSize(width: 1.0, height: -1.0))
+                }
+            }
+            .padding()
+        }
+        .scaleEffect(CGSize(width: 1.0, height: -1.0))
+    }
+    
+    // MARK: - Types
+    
+    @Observable
+    class ViewModel
+    {
+        var messages: [Display.Message]
+        var displayedConversation: Display.Conversation.ID? = nil
+        
+        init(messages: [Display.Message] = []) {
+            self.messages = messages
+            observeDisplayedConversation()
+        }
+        
+        private func observeDisplayedConversation() {
+            withObservationTracking {
+                _ = displayedConversation
+            } onChange: {
+                Task { @MainActor [weak self] in
+                    guard let self else { return }
+                    
+                    await loadMessages()
+                    observeDisplayedConversation()
+                }
+            }
+        }
+        
+        private func loadMessages() async {
+            self.messages = []
+            
+            guard let displayedConversation else { return }
+            
+            do {
+                let client = XPCClient()
+                let messages = try await client.getMessages(conversationId: displayedConversation)
+                self.messages = messages.map { Display.Message(from: $0) }
+            } catch {
+                print("Message fetch error: \(error)")
+            }
+        }
+    }
+}
+
+struct MessageCellView: View
+{
+    @Binding var message: Display.Message
+    
+    var body: some View {
+        VStack {
+            HStack(alignment: .bottom) {
+                if message.isFromMe { Spacer(minLength: .minimumBubbleHorizontalPadding) }
+
+                TextCellContentView(text: message.text, isFromMe: message.isFromMe)
+                    .mask {
+                        UnevenRoundedRectangle(cornerRadii: RectangleCornerRadii(
+                            topLeading: message.isFromMe ? .dominantCornerRadius : .minorCornerRadius,
+                            bottomLeading: .dominantCornerRadius,
+                            bottomTrailing: .dominantCornerRadius,
+                            topTrailing: message.isFromMe ? .minorCornerRadius : .dominantCornerRadius,
+                        ))
+                    }
+
+                if !message.isFromMe { Spacer(minLength: .minimumBubbleHorizontalPadding) }
+            }
+        }
+    }
+    
+    // MARK: - Types
+    
+    private struct TextCellContentView: View
+    {
+        let text: String
+        let isFromMe: Bool
+        
+        var body: some View {
+            let bubbleColor: Color = isFromMe ? .blue : Color(.systemGray)
+            let textColor: Color = isFromMe ? .white : .primary
+            
+            HStack {
+                Text(text)
+                    .foregroundStyle(textColor)
+                    .multilineTextAlignment(.leading)
+            }
+            .fixedSize(horizontal: false, vertical: true)
+            .padding(.horizontal, 16.0)
+            .padding(.vertical, 10.0)
+            .background(bubbleColor)
+        }
+    }
+}
+
+fileprivate extension CGFloat {
+    static let dominantCornerRadius = 16.0
+    static let minorCornerRadius = 4.0
+    static let minimumBubbleHorizontalPadding = 80.0
+}
+
+#Preview {
+    @Previewable @State var model = ChatTranscriptView.ViewModel(messages: [
+        .init(sender: .me,                 text: "Hello, how are you?"),
+        .init(sender: .counterpart("Bob"), text: "I am doing fine!")
+    ])
+    
+    ChatTranscriptView(model: $model)
+}

kordophone2/ConversationView.swift

@@ -0,0 +1,21 @@
+//
+//  ConversationView.swift
+//  kordophone2
+//
+//  Created by James Magahern on 8/24/25.
+//
+
+import SwiftUI
+
+struct ConversationView: View
+{
+    @Binding var transcriptModel: ChatTranscriptView.ViewModel
+    @Binding var entryModel: MessageEntryView.ViewModel
+    
+    var body: some View {
+        VStack {
+            ChatTranscriptView(model: $transcriptModel)
+            MessageEntryView(viewModel: $entryModel)
+        }
+    }
+}

kordophone2/MessageEntryView.swift

@@ -0,0 +1,80 @@
+//
+//  MessageEntryView.swift
+//  kordophone2
+//
+//  Created by James Magahern on 8/24/25.
+//
+
+import SwiftUI
+
+struct MessageEntryView: View
+{
+    @Binding var viewModel: ViewModel
+    
+    @Environment(\.selectedConversation) private var selectedConversation
+    
+    var body: some View {
+        VStack(spacing: 0.0) {
+            Rectangle()
+                .fill(.separator)
+                .frame(height: 1.0)
+            
+            HStack {
+                TextField("", text: $viewModel.draftText, axis: .vertical)
+                    .focusEffectDisabled(true)
+                    .lineLimit(nil)
+                    .scrollContentBackground(.hidden)
+                    .fixedSize(horizontal: false, vertical: true)
+                    .font(.body)
+                    .scrollDisabled(true)
+                    .padding(8.0)
+                    .background {
+                        RoundedRectangle(cornerRadius: 6.0)
+                            .fill(.background)
+                    }
+                
+                Button("Send") {
+                    viewModel.sendDraft(to: selectedConversation)
+                }
+                .disabled(viewModel.draftText.isEmpty)
+                .keyboardShortcut(.defaultAction)
+            }
+            .padding(10.0)
+        }
+    }
+    
+    // MARK: - Types
+    
+    @Observable
+    class ViewModel
+    {
+        var draftText: String = ""
+        
+        func sendDraft(to convo: Display.Conversation?) {
+            guard let convo else { return }
+            guard !draftText.isEmpty else { return }
+            
+            let messageText = self.draftText
+            self.draftText = ""
+            
+            Task {
+                let xpc = XPCClient()
+                
+                do {
+                    try await xpc.sendMessage(conversationId: convo.id, message: messageText)
+                } catch {
+                    print("Sending error: \(error)")
+                }
+            }
+        }
+    }
+}
+
+#Preview {
+    @Previewable @State var model = MessageEntryView.ViewModel()
+    
+    VStack {
+        Spacer()
+        MessageEntryView(viewModel: $model)
+    }
+}

kordophone2/Models.swift

@@ -36,6 +36,40 @@ enum Display
             self.messagePreview = messagePreview
         }
     }
+    
+    struct Message: Identifiable
+    {
+        let id: String
+        let sender: Sender
+        let text: String
+        
+        var isFromMe: Bool {
+            if case .me = sender { true }
+            else { false }
+        }
+
+        init(from m: Serialized.Message) {
+            self.id = m.guid
+            self.text = m.text
+            self.sender = if m.sender == "(Me)" {
+                .me
+            } else {
+                .counterpart(m.sender)
+            }
+        }
+        
+        init(id: String = UUID().uuidString, sender: Sender = .me, text: String) {
+            self.id = id
+            self.sender = sender
+            self.text = text
+        }
+        
+        enum Sender
+        {
+            case me
+            case counterpart(String)
+        }
+    }
 }
 
 enum Serialized
@@ -70,4 +104,26 @@ enum Serialized
             self.date = dt
         }
     }
+
+    struct Message: Decodable
+    {
+        let guid: String
+        let sender: String
+        let text: String
+        let date: Date
+
+        init?(xpc dict: xpc_object_t)
+        {
+            guard let g: String = dict["id"] else { return nil }
+
+            let s: String = dict["sender"] ?? ""
+            let t: String = dict["text"] ?? ""
+            let d: Date = dict["date"] ?? Date(timeIntervalSince1970: 0)
+
+            self.guid = g
+            self.sender = s
+            self.text = t
+            self.date = d
+        }
+    }
 }

kordophone2/XPC/XPCClient.swift

@@ -46,11 +46,41 @@ final class XPCClient
             if xpc_get_type(element) == XPC_TYPE_DICTIONARY, let conv = Serialized.Conversation(xpc: element) {
                 results.append(conv)
             }
-            return true
+        return true
         }
         return results
     }
 
+    public func getMessages(conversationId: String, limit: Int = 100, offset: Int = 0) async throws -> [Serialized.Message] {
+        var args: [String: xpc_object_t] = [:]
+        args["conversation_id"] = xpcString(conversationId)
+        args["limit"] = xpcString(String(limit))
+        args["offset"] = xpcString(String(offset))
+
+        let req = makeRequest(method: "GetMessages", arguments: args)
+        guard let reply = try await sendSync(req), xpc_get_type(reply) == XPC_TYPE_DICTIONARY else { return [] }
+        guard let items = xpc_dictionary_get_value(reply, "messages"), xpc_get_type(items) == XPC_TYPE_ARRAY else { return [] }
+
+        var results: [Serialized.Message] = []
+        xpc_array_apply(items) { _, element in
+            if xpc_get_type(element) == XPC_TYPE_DICTIONARY, let msg = Serialized.Message(xpc: element) {
+                results.append(msg)
+            }
+            return true
+        }
+
+        return results
+    }
+
+    public func sendMessage(conversationId: String, message: String) async throws {
+        var args: [String: xpc_object_t] = [:]
+        args["conversation_id"] = xpcString(conversationId)
+        args["text"] = xpcString(message)
+
+        let req = makeRequest(method: "SendMessage", arguments: args)
+        guard let reply = try await sendSync(req), xpc_get_type(reply) == XPC_TYPE_DICTIONARY else { throw Error.typeError }
+    }
+    
     // MARK: - Types
     
     enum Error: Swift.Error