add history load

yobble/Network/ChatModels.swift

@@ -5,6 +5,11 @@ struct PrivateChatListData: Decodable {
     let hasMore: Bool
 }
 
+struct PrivateChatHistoryData: Decodable {
+    let items: [MessageItem]
+    let hasMore: Bool
+}
+
 struct PrivateChatListItem: Decodable, Identifiable {
     enum ChatType: String, Decodable {
         case `self`

yobble/Network/ChatService.swift

@@ -66,6 +66,51 @@ final class ChatService {
         }
     }
 
+    func fetchPrivateChatHistory(
+        chatId: String,
+        beforeMessageId: String?,
+        limit: Int,
+        completion: @escaping (Result<PrivateChatHistoryData, Error>) -> Void
+    ) {
+        var query: [String: String?] = [
+            "chat_id": chatId,
+            "limit": String(limit)
+        ]
+
+        if let beforeMessageId,
+           !beforeMessageId.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
+            query["before_message_id"] = beforeMessageId
+        }
+
+        client.request(
+            path: "/v1/chat/private/history",
+            method: .get,
+            query: query,
+            requiresAuth: true
+        ) { [decoder] result in
+            switch result {
+            case .success(let response):
+                do {
+                    let apiResponse = try decoder.decode(APIResponse<PrivateChatHistoryData>.self, from: response.data)
+                    guard apiResponse.status == "fine" else {
+                        let message = apiResponse.detail ?? NSLocalizedString("Не удалось загрузить историю чата.", comment: "")
+                        completion(.failure(ChatServiceError.unexpectedStatus(message)))
+                        return
+                    }
+                    completion(.success(apiResponse.data))
+                } catch {
+                    let debugMessage = Self.describeDecodingError(error: error, data: response.data)
+                    if AppConfig.DEBUG {
+                        print("[ChatService] decode private chat history failed: \(debugMessage)")
+                    }
+                    completion(.failure(ChatServiceError.decoding(debugDescription: debugMessage)))
+                }
+            case .failure(let error):
+                completion(.failure(error))
+            }
+        }
+    }
+
     private static func decodeDate(from decoder: Decoder) throws -> Date {
         let container = try decoder.singleValueContainer()
         let string = try container.decode(String.self)

yobble/Resources/Localizable.xcstrings

@@ -1,6 +1,9 @@
 {
   "sourceLanguage" : "ru",
   "strings" : {
+    "(без текста)" : {
+
+    },
     "@%@" : {
       "localizations" : {
         "en" : {
@@ -57,15 +60,9 @@
           }
         }
       }
-    },
-    "Chat ID:" : {
-
     },
     "Companion ID" : {
       "comment" : "Search placeholder companion title"
-    },
-    "Companion ID:" : {
-
     },
     "DEBUG UPDATE" : {
       "localizations" : {
@@ -210,6 +207,9 @@
           }
         }
       }
+    },
+    "В чате пока нет сообщений." : {
+
     },
     "Ваш e-mail" : {
       "comment" : "feedback: email placeholder",
@@ -414,6 +414,9 @@
     },
     "Заглушка: Хранилище данных" : {
 
+    },
+    "Загружаем ранние сообщения…" : {
+
     },
     "Загружаем чаты…" : {
       "localizations" : {
@@ -424,6 +427,9 @@
           }
         }
       }
+    },
+    "Загрузка сообщений…" : {
+
     },
     "Загрузка..." : {
       "localizations" : {
@@ -872,6 +878,9 @@
     },
     "Не удалось выполнить поиск." : {
       "comment" : "Search error fallback\nSearch service decoding error"
+    },
+    "Не удалось загрузить историю чата." : {
+
     },
     "Не удалось загрузить профиль." : {
       "comment" : "Profile service decoding error\nProfile unexpected status"
@@ -1048,9 +1057,6 @@
           }
         }
       }
-    },
-    "Неизвестный" : {
-
     },
     "Неизвестный пользователь" : {
       "localizations" : {
@@ -2232,9 +2238,6 @@
           }
         }
       }
-    },
-    "Экран чата в разработке" : {
-
     },
     "Язык" : {
       "localizations" : {

yobble/ViewModels/PrivateChatViewModel.swift

@@ -0,0 +1,128 @@
+import Foundation
+
+@MainActor
+final class PrivateChatViewModel: ObservableObject {
+    @Published private(set) var messages: [MessageItem] = []
+    @Published private(set) var isInitialLoading: Bool = false
+    @Published private(set) var isLoadingMore: Bool = false
+    @Published var errorMessage: String?
+
+    private let chatService: ChatService
+    private let chatId: String
+    private let pageSize: Int
+    private var hasMore: Bool = true
+    private var didLoadInitially: Bool = false
+
+    init(chatId: String, chatService: ChatService = ChatService(), pageSize: Int = 30) {
+        self.chatId = chatId
+        self.chatService = chatService
+        self.pageSize = pageSize
+    }
+
+    func loadInitialHistory(force: Bool = false) {
+        if !force && didLoadInitially { return }
+        guard !isInitialLoading else { return }
+
+        isInitialLoading = true
+        errorMessage = nil
+        hasMore = true
+
+        chatService.fetchPrivateChatHistory(chatId: chatId, beforeMessageId: nil, limit: pageSize) { [weak self] result in
+            guard let self else { return }
+
+            switch result {
+            case .success(let data):
+                self.hasMore = data.hasMore
+                self.messages = Self.merge(existing: [], newMessages: data.items)
+                self.didLoadInitially = true
+            case .failure(let error):
+                self.errorMessage = self.message(for: error)
+            }
+
+            self.isInitialLoading = false
+        }
+    }
+
+    func refresh() {
+        didLoadInitially = false
+        loadInitialHistory(force: true)
+    }
+
+    func loadMoreIfNeeded(for message: MessageItem) {
+        guard didLoadInitially, !isInitialLoading, hasMore, !isLoadingMore else { return }
+        guard let first = messages.first, first.id == message.id else { return }
+
+        isLoadingMore = true
+
+        chatService.fetchPrivateChatHistory(chatId: chatId, beforeMessageId: message.id, limit: pageSize) { [weak self] result in
+            guard let self else { return }
+
+            switch result {
+            case .success(let data):
+                self.hasMore = data.hasMore
+                if !data.items.isEmpty {
+                    self.messages = Self.merge(existing: self.messages, newMessages: data.items)
+                }
+            case .failure(let error):
+                self.errorMessage = self.message(for: error)
+            }
+
+            self.isLoadingMore = false
+        }
+    }
+
+    private func message(for error: Error) -> String {
+        if let chatError = error as? ChatServiceError {
+            return chatError.errorDescription ?? NSLocalizedString("Не удалось загрузить историю чата.", comment: "")
+        }
+
+        if let networkError = error as? NetworkError {
+            switch networkError {
+            case .unauthorized:
+                return NSLocalizedString("Сессия истекла. Войдите снова.", comment: "")
+            case .invalidURL, .noResponse:
+                return NSLocalizedString("Ошибка соединения с сервером.", comment: "")
+            case .network(let underlying):
+                return String(format: NSLocalizedString("Ошибка сети: %@", comment: ""), underlying.localizedDescription)
+            case .server(let statusCode, _):
+                return String(format: NSLocalizedString("Ошибка сервера (%@).", comment: ""), "\(statusCode)")
+            }
+        }
+
+        return NSLocalizedString("Неизвестная ошибка. Попробуйте позже.", comment: "")
+    }
+
+    private static func merge(existing: [MessageItem], newMessages: [MessageItem]) -> [MessageItem] {
+        var combined: [MessageItem] = []
+        combined.reserveCapacity(existing.count + newMessages.count)
+
+        var seen: Set<String> = []
+
+        for message in newMessages {
+            if seen.insert(message.id).inserted {
+                combined.append(message)
+            }
+        }
+
+        for message in existing {
+            if seen.insert(message.id).inserted {
+                combined.append(message)
+            }
+        }
+
+        combined.sort(by: compare)
+        return combined
+    }
+
+    private static func compare(lhs: MessageItem, rhs: MessageItem) -> Bool {
+        if let lhsDate = lhs.createdAt, let rhsDate = rhs.createdAt, lhsDate != rhsDate {
+            return lhsDate < rhsDate
+        }
+
+        if let lhsId = Int(lhs.messageId), let rhsId = Int(rhs.messageId), lhsId != rhsId {
+            return lhsId < rhsId
+        }
+
+        return lhs.messageId < rhs.messageId
+    }
+}

yobble/Views/Chat/PrivateChatView.swift

@@ -0,0 +1,211 @@
+import SwiftUI
+
+struct PrivateChatView: View {
+    let chat: PrivateChatListItem
+    let currentUserId: String?
+
+    @StateObject private var viewModel: PrivateChatViewModel
+    @State private var hasPositionedToBottom: Bool = false
+
+    init(chat: PrivateChatListItem, currentUserId: String?) {
+        self.chat = chat
+        self.currentUserId = currentUserId
+        _viewModel = StateObject(wrappedValue: PrivateChatViewModel(chatId: chat.chatId))
+    }
+
+    var body: some View {
+        ScrollViewReader { proxy in
+            content
+                .onChange(of: viewModel.messages.count) { _ in
+                    guard !viewModel.isLoadingMore,
+                          let lastId = viewModel.messages.last?.id else { return }
+                    DispatchQueue.main.async {
+                        withAnimation(.easeInOut(duration: 0.2)) {
+                            proxy.scrollTo(lastId, anchor: .bottom)
+                        }
+                        hasPositionedToBottom = true
+                    }
+                }
+        }
+        .navigationTitle(title)
+        .navigationBarTitleDisplayMode(.inline)
+        .task {
+            viewModel.loadInitialHistory()
+        }
+        .onChange(of: viewModel.isInitialLoading) { isLoading in
+            if isLoading {
+                hasPositionedToBottom = false
+            }
+        }
+    }
+
+    @ViewBuilder
+    private var content: some View {
+        if viewModel.isInitialLoading && viewModel.messages.isEmpty {
+            ProgressView(NSLocalizedString("Загрузка сообщений…", comment: ""))
+                .frame(maxWidth: .infinity, maxHeight: .infinity)
+        } else if let error = viewModel.errorMessage, viewModel.messages.isEmpty {
+            errorView(message: error)
+        } else {
+            ScrollView {
+                LazyVStack(alignment: .leading, spacing: 12) {
+                    if viewModel.isLoadingMore {
+                        loadingMoreView
+                    } else if viewModel.messages.isEmpty {
+                        emptyState
+                    }
+
+                    ForEach(viewModel.messages) { message in
+                        messageRow(for: message)
+                            .id(message.id)
+                            .onAppear {
+                                guard hasPositionedToBottom else { return }
+                                viewModel.loadMoreIfNeeded(for: message)
+                            }
+                    }
+
+                    if let message = viewModel.errorMessage,
+                       !message.isEmpty,
+                       !viewModel.messages.isEmpty {
+                        errorBanner(message: message)
+                    }
+                }
+                .padding(.vertical, 12)
+            }
+            .refreshable {
+                viewModel.refresh()
+            }
+        }
+    }
+
+    private var emptyState: some View {
+        Text(NSLocalizedString("В чате пока нет сообщений.", comment: ""))
+            .font(.footnote)
+            .foregroundColor(.secondary)
+            .frame(maxWidth: .infinity, alignment: .center)
+            .padding(.top, 32)
+    }
+
+    private var loadingMoreView: some View {
+        HStack {
+            ProgressView()
+            Text(NSLocalizedString("Загружаем ранние сообщения…", comment: ""))
+                .font(.caption)
+        }
+        .frame(maxWidth: .infinity)
+        .padding(.vertical, 8)
+    }
+
+    private func errorView(message: String) -> some View {
+        VStack(spacing: 12) {
+            Text(message)
+                .font(.body)
+                .multilineTextAlignment(.center)
+                .foregroundColor(.primary)
+
+            Button(action: { viewModel.refresh() }) {
+                Text(NSLocalizedString("Повторить", comment: ""))
+                    .font(.body)
+            }
+        }
+        .padding()
+        .frame(maxWidth: .infinity, maxHeight: .infinity)
+    }
+
+    private func messageRow(for message: MessageItem) -> some View {
+        let isCurrentUser = currentUserId.map { $0 == message.senderId } ?? false
+        return HStack {
+            if isCurrentUser { Spacer(minLength: 32) }
+
+            VStack(alignment: isCurrentUser ? .trailing : .leading, spacing: 6) {
+                if !isCurrentUser {
+                    Text(senderName(for: message))
+                        .font(.caption)
+                        .foregroundColor(.secondary)
+                }
+
+                Text(contentText(for: message))
+                    .font(.body)
+                    .foregroundColor(isCurrentUser ? .white : .primary)
+                    .frame(maxWidth: .infinity, alignment: isCurrentUser ? .trailing : .leading)
+
+                Text(timestamp(for: message))
+                    .font(.caption2)
+                    .foregroundColor(isCurrentUser ? Color.white.opacity(0.8) : .secondary)
+            }
+            .padding(.vertical, 10)
+            .padding(.horizontal, 12)
+            .background(isCurrentUser ? Color.accentColor : Color(.secondarySystemBackground))
+            .clipShape(RoundedRectangle(cornerRadius: 16, style: .continuous))
+
+            if !isCurrentUser { Spacer(minLength: 32) }
+        }
+        .padding(.horizontal, 16)
+    }
+
+    private func senderName(for message: MessageItem) -> String {
+        if let full = message.senderData?.fullName, !full.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
+            return full
+        }
+        if let custom = message.senderData?.customName, !custom.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
+            return custom
+        }
+        if let login = message.senderData?.login, !login.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
+            return "@\(login)"
+        }
+        return message.senderId
+    }
+
+    private func timestamp(for message: MessageItem) -> String {
+        guard let date = message.createdAt else {
+            return ""
+        }
+        return Self.timeFormatter.string(from: date)
+    }
+
+    private func contentText(for message: MessageItem) -> String {
+        guard let content = message.content?.trimmingCharacters(in: .whitespacesAndNewlines), !content.isEmpty else {
+            return NSLocalizedString("(без текста)", comment: "")
+        }
+        return content
+    }
+
+    private func errorBanner(message: String) -> some View {
+        HStack {
+            Image(systemName: "exclamationmark.triangle.fill")
+                .foregroundColor(.orange)
+            Text(message)
+                .font(.footnote)
+                .foregroundColor(.primary)
+        }
+        .padding()
+        .background(Color(.secondarySystemBackground))
+        .clipShape(RoundedRectangle(cornerRadius: 12, style: .continuous))
+        .padding(.horizontal, 16)
+        .padding(.top, 8)
+    }
+
+    private static let timeFormatter: DateFormatter = {
+        let formatter = DateFormatter()
+        formatter.dateStyle = .none
+        formatter.timeStyle = .short
+        return formatter
+    }()
+
+    private var title: String {
+        if let full = chat.chatData?.fullName, !full.isEmpty {
+            return full
+        }
+        if let custom = chat.chatData?.customName, !custom.isEmpty {
+            return custom
+        }
+        if let login = chat.chatData?.login, !login.isEmpty {
+            return "@\(login)"
+        }
+        return NSLocalizedString("Чат", comment: "")
+    }
+}
+
+// MARK: - Preview
+
+// Previews intentionally omitted - MessageItem has custom decoding-only initializer.

yobble/Views/Tab/ChatsTab.swift

@@ -320,7 +320,7 @@ struct ChatsTab: View {
         }
         .background(
             NavigationLink(
-                destination: ChatPlaceholderView(chat: chat),
+                destination: PrivateChatView(chat: chat, currentUserId: currentUserId),
                 tag: chat.chatId,
                 selection: $selectedChatId
             ) {
@@ -965,66 +965,6 @@ struct ChatsTab_Previews: PreviewProvider {
     }
 }
 
-private struct ChatPlaceholderView: View {
-    let chat: PrivateChatListItem
-
-    private var companionId: String {
-        if let profileId = chat.chatData?.userId {
-            return profileId
-        }
-        if let senderId = chat.lastMessage?.senderId {
-            return senderId
-        }
-        return NSLocalizedString("Неизвестный", comment: "")
-    }
-
-    var body: some View {
-        VStack(spacing: 16) {
-            Text(NSLocalizedString("Экран чата в разработке", comment: ""))
-                .font(.headline)
-
-            VStack(alignment: .leading, spacing: 8) {
-                HStack {
-                    Text("Chat ID:")
-                        .font(.subheadline)
-                        .foregroundColor(.secondary)
-                    Text(chat.chatId)
-                        .font(.body.monospaced())
-                }
-
-                if companionId != NSLocalizedString("Неизвестный", comment: "") {
-                    HStack {
-                        Text("Companion ID:")
-                            .font(.subheadline)
-                            .foregroundColor(.secondary)
-                        Text(companionId)
-                            .font(.body.monospaced())
-                    }
-                }
-            }
-            .frame(maxWidth: .infinity, alignment: .leading)
-
-            Spacer()
-        }
-        .padding()
-        .navigationTitle(title)
-        .navigationBarTitleDisplayMode(.inline)
-    }
-
-    private var title: String {
-        if let full = chat.chatData?.fullName, !full.isEmpty {
-            return full
-        }
-        if let custom = chat.chatData?.customName, !custom.isEmpty {
-            return custom
-        }
-        if let login = chat.chatData?.login, !login.isEmpty {
-            return "@\(login)"
-        }
-        return NSLocalizedString("Чат", comment: "")
-    }
-}
-
 extension Notification.Name {
     static let debugRefreshChats = Notification.Name("debugRefreshChats")
 }