import Foundation
import ComposableArchitecture

@Reducer
struct LoginFeature {
    @ObservableState
    struct State: Equatable {
        var account: String = ""
        var password: String = ""
        var isLoading = false
        var error: String?
        var idLoginState = IDLoginFeature.State()
        var emailLoginState = EMailLoginFeature.State()  // 新增：邮箱登录状态
        
        // 新增：Account Model 和 Ticket 相关状态
        var accountModel: AccountModel?
        var isTicketLoading = false
        var ticketError: String?
        var loginStep: LoginStep = .initial
        
        enum LoginStep: Equatable {
            case initial        // 初始状态
            case authenticating // 正在进行 OAuth 认证
            case gettingTicket  // 正在获取 Ticket
            case completed      // 认证完成
            case failed         // 认证失败
        }
        
        #if DEBUG
        init() {
            // 移除测试用的硬编码凭据
            self.account = ""
            self.password = ""
        }
        #endif
    }
    
    enum Action {
        case updateAccount(String)
        case updatePassword(String)
        case login
        case loginResponse(TaskResult<IDLoginResponse>)
        case idLogin(IDLoginFeature.Action)
        case emailLogin(EMailLoginFeature.Action)  // 新增：邮箱登录action
        
        // 新增：Ticket 相关 actions
        case requestTicket(accessToken: String)
        case ticketResponse(TaskResult<TicketResponse>)
        case clearTicketError
        case resetLogin
    }
    
    @Dependency(\.apiService) var apiService
    
    var body: some ReducerOf<Self> {
        Scope(state: \.idLoginState, action: \.idLogin) {
            IDLoginFeature()
        }
        
        Scope(state: \.emailLoginState, action: \.emailLogin) {
            EMailLoginFeature()
        }
        
        Reduce { state, action in
            switch action {
            case let .updateAccount(account):
                state.account = account
                return .none
                
            case let .updatePassword(password):
                state.password = password
                return .none
                
            case .login:
                state.isLoading = true
                state.error = nil
                state.ticketError = nil
                state.loginStep = .authenticating
                
                // 实现登录逻辑（使用account和password）
                return .run { [account = state.account, password = state.password] send in
                    do {
                        // 使用LoginHelper创建加密的登录请求
                        guard let loginRequest = LoginHelper.createIDLoginRequest(userID: account, password: password) else {
                            await send(.loginResponse(.failure(APIError.decodingError("加密失败"))))
                            return
                        }
                        
                        // 发起登录请求
                        let response = try await apiService.request(loginRequest)
                        await send(.loginResponse(.success(response)))
                    } catch {
                        if let apiError = error as? APIError {
                            await send(.loginResponse(.failure(apiError)))
                        } else {
                            await send(.loginResponse(.failure(APIError.unknown(error.localizedDescription))))
                        }
                    }
                }
                
            case let .loginResponse(.success(response)):
                state.isLoading = false
                if response.isSuccess {
                    // OAuth 认证成功，清除错误信息
                    state.error = nil
                    
                    // 从响应数据创建 AccountModel
                    if let loginData = response.data,
                       let accountModel = AccountModel.from(loginData: loginData) {
                        state.accountModel = accountModel
                        
                                        debugInfo("✅ OAuth 认证成功")
                debugInfo("🔑 Access Token: \(accountModel.accessToken ?? "nil")")
                debugInfo("🆔 用户 UID: \(accountModel.uid ?? "nil")")
                        
                        // 自动获取 ticket
                        return .send(.requestTicket(accessToken: accountModel.accessToken!))
                    } else {
                        state.error = "登录数据格式错误"
                        state.loginStep = .failed
                    }
                } else {
                    state.error = response.errorMessage
                    state.loginStep = .failed
                }
                return .none
                
            case let .loginResponse(.failure(error)):
                state.isLoading = false
                state.error = error.localizedDescription
                state.loginStep = .failed
                return .none
                
            case let .requestTicket(accessToken):
                state.isTicketLoading = true
                state.ticketError = nil
                state.loginStep = .gettingTicket
                
                return .run { [accountModel = state.accountModel] send in
                    do {
                        // 从 AccountModel 获取 uid，转换为 Int 类型
                        let uid = accountModel?.uid != nil ? Int(accountModel!.uid!) : nil
                        let ticketRequest = TicketHelper.createTicketRequest(accessToken: accessToken, uid: uid)
                        let response = try await apiService.request(ticketRequest)
                        await send(.ticketResponse(.success(response)))
                    } catch {
                        debugError("❌ Ticket 获取失败: \(error)")
                        await send(.ticketResponse(.failure(APIError.networkError(error.localizedDescription))))
                    }
                }
                
            case let .ticketResponse(.success(response)):
                state.isTicketLoading = false
                if response.isSuccess {
                    state.ticketError = nil
                    state.loginStep = .completed
                    
                                    debugInfo("✅ 完整登录流程成功")
                debugInfo("🎫 Ticket 获取成功: \(response.ticket ?? "nil")")
                    
                    // 更新 AccountModel 中的 ticket 并保存
                    if let ticket = response.ticket {
                        if var accountModel = state.accountModel {
                            accountModel.ticket = ticket
                            state.accountModel = accountModel
                            
                            // 保存完整的 AccountModel
                            UserInfoManager.saveAccountModel(accountModel)
                            
                            // 发送 Ticket 获取成功通知，触发导航到主页面
                            NotificationCenter.default.post(name: .ticketSuccess, object: nil)
                        } else {
                            debugError("❌ AccountModel 不存在，无法保存 ticket")
                            state.ticketError = "内部错误：账户信息丢失"
                            state.loginStep = .failed
                        }
                    } else {
                        state.ticketError = "Ticket 为空"
                        state.loginStep = .failed
                    }
                    
                } else {
                    state.ticketError = response.errorMessage
                    state.loginStep = .failed
                }
                return .none
                
            case let .ticketResponse(.failure(error)):
                state.isTicketLoading = false
                state.ticketError = error.localizedDescription
                state.loginStep = .failed
                debugError("❌ Ticket 获取失败: \(error.localizedDescription)")
                return .none
                
            case .clearTicketError:
                state.ticketError = nil
                return .none
                
            case .resetLogin:
                state.isLoading = false
                state.isTicketLoading = false
                state.error = nil
                state.ticketError = nil
                state.accountModel = nil  // 清除 AccountModel
                state.loginStep = .initial
                
                // 清除本地存储的认证信息
                UserInfoManager.clearAllAuthenticationData()
                
                return .none
                
            case .idLogin:
                // IDLogin动作由子feature处理
                return .none
                
            case .emailLogin:
                // EmailLogin动作由子feature处理
                return .none
            }
        }
    }
}