278 lines
11 KiB
Swift
278 lines
11 KiB
Swift
import Foundation
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enum ChatServiceError: LocalizedError {
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case unexpectedStatus(String)
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case decoding(debugDescription: String)
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var errorDescription: String? {
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switch self {
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case .unexpectedStatus(let message):
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return message
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case .decoding(let debugDescription):
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return AppConfig.DEBUG
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? debugDescription
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: NSLocalizedString("Не удалось обработать данные чатов.", comment: "")
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}
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}
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}
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final class ChatService {
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private let client: NetworkClient
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private let decoder: JSONDecoder
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private let cacheWriter: ChatCacheWriter
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init(client: NetworkClient = .shared, cacheWriter: ChatCacheWriter = .shared) {
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self.client = client
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self.decoder = JSONDecoder()
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self.decoder.keyDecodingStrategy = .convertFromSnakeCase
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self.decoder.dateDecodingStrategy = .custom(Self.decodeDate)
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self.cacheWriter = cacheWriter
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}
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func fetchPrivateChats(
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offset: Int,
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limit: Int,
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completion: @escaping (Result<PrivateChatListData, Error>) -> Void
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) {
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let query: [String: String?] = [
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"offset": String(offset),
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"limit": String(limit)
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]
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client.request(
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path: "/v1/chat/private/list",
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method: .get,
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query: query,
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requiresAuth: true
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) { [decoder, weak self] result in
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switch result {
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case .success(let response):
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do {
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let apiResponse = try decoder.decode(APIResponse<PrivateChatListData>.self, from: response.data)
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guard apiResponse.status == "fine" else {
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let message = apiResponse.detail ?? NSLocalizedString("Не удалось загрузить список чатов.", comment: "")
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completion(.failure(ChatServiceError.unexpectedStatus(message)))
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return
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}
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let chatData = apiResponse.data
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self?.cacheWriter.storePrivateChatList(chatData)
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completion(.success(chatData))
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} catch {
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let debugMessage = Self.describeDecodingError(error: error, data: response.data)
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if AppConfig.DEBUG {
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print("[ChatService] decode private chats failed: \(debugMessage)")
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}
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completion(.failure(ChatServiceError.decoding(debugDescription: debugMessage)))
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}
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case .failure(let error):
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completion(.failure(error))
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}
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}
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}
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func fetchPrivateChatHistory(
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chatId: String,
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beforeMessageId: String?,
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limit: Int,
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completion: @escaping (Result<PrivateChatHistoryData, Error>) -> Void
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) {
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var query: [String: String?] = [
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"chat_id": chatId,
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"limit": String(limit)
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]
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if let beforeMessageId,
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!beforeMessageId.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
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query["before_message_id"] = beforeMessageId
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}
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client.request(
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path: "/v1/chat/private/history",
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method: .get,
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query: query,
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requiresAuth: true
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) { [decoder] result in
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switch result {
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case .success(let response):
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do {
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let apiResponse = try decoder.decode(APIResponse<PrivateChatHistoryData>.self, from: response.data)
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guard apiResponse.status == "fine" else {
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let message = apiResponse.detail ?? NSLocalizedString("Не удалось загрузить историю чата.", comment: "")
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completion(.failure(ChatServiceError.unexpectedStatus(message)))
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return
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}
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completion(.success(apiResponse.data))
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} catch {
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let debugMessage = Self.describeDecodingError(error: error, data: response.data)
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if AppConfig.DEBUG {
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print("[ChatService] decode private chat history failed: \(debugMessage)")
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}
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completion(.failure(ChatServiceError.decoding(debugDescription: debugMessage)))
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}
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case .failure(let error):
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completion(.failure(error))
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}
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}
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}
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func createOrFindPrivateChat(
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targetUserId: String,
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completion: @escaping (Result<PrivateChatCreateData, Error>) -> Void
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) {
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let query: [String: String?] = [
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"target_user_id": targetUserId
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]
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client.request(
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path: "/v1/chat/private/create",
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method: .post,
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query: query,
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requiresAuth: true
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) { [decoder] result in
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switch result {
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case .success(let response):
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do {
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let apiResponse = try decoder.decode(APIResponse<PrivateChatCreateData>.self, from: response.data)
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guard apiResponse.status == "fine" else {
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let message = apiResponse.detail ?? NSLocalizedString("Не удалось создать чат.", comment: "")
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completion(.failure(ChatServiceError.unexpectedStatus(message)))
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return
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}
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completion(.success(apiResponse.data))
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} catch {
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let debugMessage = Self.describeDecodingError(error: error, data: response.data)
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if AppConfig.DEBUG {
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print("[ChatService] create private chat decode failed: \(debugMessage)")
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}
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completion(.failure(ChatServiceError.decoding(debugDescription: debugMessage)))
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}
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case .failure(let error):
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completion(.failure(error))
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}
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}
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}
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func sendPrivateMessage(
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chatId: String,
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content: String,
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completion: @escaping (Result<PrivateMessageSendData, Error>) -> Void
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) {
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let payload: [String: Any] = [
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"chat_id": chatId,
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"content": content,
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"message_type": ["text"]
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]
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guard let body = try? JSONSerialization.data(withJSONObject: payload, options: []) else {
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completion(.failure(ChatServiceError.decoding(debugDescription: "Невозможно сериализовать тело запроса.")))
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return
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}
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client.request(
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path: "/v1/chat/private/send",
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method: .post,
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headers: ["Content-Type": "application/json"],
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body: body,
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requiresAuth: true
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) { [decoder] result in
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switch result {
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case .success(let response):
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do {
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let apiResponse = try decoder.decode(APIResponse<PrivateMessageSendData>.self, from: response.data)
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guard apiResponse.status == "fine" else {
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let message = apiResponse.detail ?? NSLocalizedString("Не удалось отправить сообщение.", comment: "")
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completion(.failure(ChatServiceError.unexpectedStatus(message)))
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return
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}
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completion(.success(apiResponse.data))
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} catch {
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let debugMessage = Self.describeDecodingError(error: error, data: response.data)
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if AppConfig.DEBUG {
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print("[ChatService] send private message decode failed: \(debugMessage)")
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}
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completion(.failure(ChatServiceError.decoding(debugDescription: debugMessage)))
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}
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case .failure(let error):
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completion(.failure(error))
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}
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}
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}
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private static func decodeDate(from decoder: Decoder) throws -> Date {
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let container = try decoder.singleValueContainer()
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let string = try container.decode(String.self)
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if let date = iso8601WithFractionalSeconds.date(from: string) {
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return date
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}
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if let date = iso8601Simple.date(from: string) {
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return date
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}
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throw DecodingError.dataCorruptedError(
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in: container,
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debugDescription: "Невозможно декодировать дату: \(string)"
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)
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}
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private static func describeDecodingError(error: Error, data: Data) -> String {
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var parts: [String] = []
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if let decodingError = error as? DecodingError {
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parts.append(decodingDescription(from: decodingError))
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} else {
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parts.append(error.localizedDescription)
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}
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if let payload = truncatedPayload(from: data) {
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parts.append("payload=\(payload)")
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}
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return parts.joined(separator: "\n")
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}
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private static func decodingDescription(from error: DecodingError) -> String {
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switch error {
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case .typeMismatch(let type, let context):
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return "Type mismatch for \(type) at \(codingPath(from: context)): \(context.debugDescription)"
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case .valueNotFound(let type, let context):
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return "Value not found for \(type) at \(codingPath(from: context)): \(context.debugDescription)"
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case .keyNotFound(let key, let context):
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return "Missing key '\(key.stringValue)' at \(codingPath(from: context)): \(context.debugDescription)"
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case .dataCorrupted(let context):
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return "Corrupted data at \(codingPath(from: context)): \(context.debugDescription)"
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@unknown default:
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return error.localizedDescription
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}
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}
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private static func codingPath(from context: DecodingError.Context) -> String {
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let path = context.codingPath.map { $0.stringValue }.filter { !$0.isEmpty }
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return path.isEmpty ? "root" : path.joined(separator: ".")
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}
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private static func truncatedPayload(from data: Data, limit: Int = 512) -> String? {
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guard let string = String(data: data, encoding: .utf8)?.trimmingCharacters(in: .whitespacesAndNewlines),
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!string.isEmpty else {
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return nil
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}
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if string.count <= limit {
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return string
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}
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let index = string.index(string.startIndex, offsetBy: limit)
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return String(string[string.startIndex..<index]) + "…"
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}
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private static let iso8601WithFractionalSeconds: ISO8601DateFormatter = {
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let formatter = ISO8601DateFormatter()
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formatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
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return formatter
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}()
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private static let iso8601Simple: ISO8601DateFormatter = {
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let formatter = ISO8601DateFormatter()
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formatter.formatOptions = [.withInternetDateTime]
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return formatter
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}()
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}
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