import Foundation
import ComposableArchitecture

@Reducer
struct EMailLoginFeature {
    @ObservableState
    struct State: Equatable {
        var email: String = ""
        var verificationCode: String = ""
        var isLoading: Bool = false
        var isCodeLoading: Bool = false
        var errorMessage: String? = nil
        var isCodeSent: Bool = false
        // 新增：登录流程状态
        var loginStep: LoginStep = .initial
        enum LoginStep: Equatable {
            case initial
            case authenticating
            case completed
            case failed
        }
        
        init() {
            self.email = ""
            self.verificationCode = ""
            self.loginStep = .initial
        }
    }
    
    enum Action {
        case emailChanged(String)
        case verificationCodeChanged(String)
        case getVerificationCodeTapped
        case getCodeResponse(Result<EmailGetCodeResponse, Error>)
        case loginButtonTapped(email: String, verificationCode: String)
        case loginResponse(Result<AccountModel, Error>)
        case forgotPasswordTapped
        case resetState
    }
    
    @Dependency(\.apiService) var apiService
    
    var body: some ReducerOf<Self> {
        Reduce { state, action in
            switch action {
            case .emailChanged(let email):
                state.email = email
                state.errorMessage = nil
                return .none
                
            case .verificationCodeChanged(let code):
                state.verificationCode = code
                state.errorMessage = nil
                return .none
                
            case .getVerificationCodeTapped:
                guard !state.email.isEmpty else {
                    state.errorMessage = LocalizedStringSync("email_login.email_required", comment: "")
                    return .none
                }
                
                guard ValidationHelper.isValidEmail(state.email) else {
                    state.errorMessage = LocalizedStringSync("email_login.invalid_email", comment: "")
                    return .none
                }
                
                state.isCodeLoading = true
                state.isCodeSent = false  // 重置状态确保触发变化
                state.errorMessage = nil
                
                return .run { [email = state.email] send in
                    do {
                        guard let request = LoginHelper.createEmailGetCodeRequest(email: email) else {
                            await send(.getCodeResponse(.failure(APIError.encryptionFailed)))
                            return
                        }
                        
                        let response = try await apiService.request(request)
                        await send(.getCodeResponse(.success(response)))
                        
                    } catch {
                        await send(.getCodeResponse(.failure(error)))
                    }
                }
                
            case .getCodeResponse(.success(let response)):
                state.isCodeLoading = false
                
                if response.isSuccess {
                    state.isCodeSent = true
                    return .none
                } else {
                    state.errorMessage = response.errorMessage
                    return .none
                }
                
            case .getCodeResponse(.failure(let error)):
                state.isCodeLoading = false
                if let apiError = error as? APIError {
                    state.errorMessage = apiError.localizedDescription
                } else {
                    state.errorMessage = "验证码发送失败，请检查网络连接"
                }
                return .none
                
            case .loginButtonTapped(let email, let verificationCode):
                guard !email.isEmpty && !verificationCode.isEmpty else {
                    state.errorMessage = LocalizedStringSync("email_login.fields_required", comment: "")
                    return .none
                }
                
                guard ValidationHelper.isValidEmail(email) else {
                    state.errorMessage = LocalizedStringSync("email_login.invalid_email", comment: "")
                    return .none
                }
                
                state.isLoading = true
                state.errorMessage = nil
                state.loginStep = .authenticating
                
                return .run { send in
                    do {
                        guard let request = await LoginHelper.createEmailLoginRequest(email: email, code: verificationCode) else {
                            await send(.loginResponse(.failure(APIError.encryptionFailed)))
                            return
                        }
                        
                        let response = try await apiService.request(request)
                        
                        if response.isSuccess, let loginData = response.data {
                            guard let accountModel = AccountModel.from(loginData: loginData) else {
                                await send(.loginResponse(.failure(APIError.invalidResponse)))
                                return
                            }
                            
                            // 第二阶段：获取Ticket
                            let ticketRequest = TicketHelper.createTicketRequest(
                                accessToken: accountModel.accessToken ?? "",
                                uid: accountModel.uid.flatMap { Int($0) }
                            )
                            let ticketResponse = try await apiService.request(ticketRequest)
                            
                            if ticketResponse.isSuccess, let ticket = ticketResponse.ticket {
                                let completeAccount = accountModel.withTicket(ticket)
                                await send(.loginResponse(.success(completeAccount)))
                            } else {
                                await send(.loginResponse(.failure(APIError.ticketFailed)))
                            }
                        } else {
                            await send(.loginResponse(.failure(APIError.custom(response.errorMessage))))
                        }
                        
                    } catch {
                        await send(.loginResponse(.failure(error)))
                    }
                }
                
            case .loginResponse(.success(let accountModel)):
                state.isLoading = false
                state.loginStep = .completed
                // Effect 保存AccountModel并获取用户信息
                return .run { _ in
                    await UserInfoManager.saveAccountModel(accountModel)
                    
                    // 新增：登录成功后自动获取用户信息
                    debugInfoSync("🔄 邮箱登录成功，开始获取用户信息")
                    if let _ = await UserInfoManager.fetchUserInfoFromServer(
                        uid: accountModel.uid,
                        apiService: apiService
                    ) {
                        debugInfoSync("✅ 用户信息获取成功")
                    } else {
                        debugErrorSync("❌ 用户信息获取失败，但不影响登录流程")
                    }
                }
                
            case .loginResponse(.failure(let error)):
                state.isLoading = false
                state.loginStep = .failed
                if let apiError = error as? APIError {
                    state.errorMessage = apiError.localizedDescription
                } else {
                    state.errorMessage = "登录失败，请重试"
                }
                return .none
                
            case .forgotPasswordTapped:
                return .none
                
            case .resetState:
                state.email = ""
                state.verificationCode = ""
                state.isLoading = false
                state.isCodeLoading = false
                state.errorMessage = nil
                state.isCodeSent = false
                state.loginStep = .initial
                return .none
            }
        }
    }
    

}