import { useState, useEffect, useMemo } from 'react';
import { useNavigate, useSearchParams, useLocation } from 'react-router-dom';
import { useTranslation } from 'react-i18next';
import { useForm } from 'react-hook-form';
import userService from '../services/user_service';
import { rsaPsw } from '../utils/encryption';

/**
 * OAuth回调处理Hook
 */
export const useOAuthCallback = () => {
  const [searchParams, setSearchParams] = useSearchParams();
  const navigate = useNavigate();
  
  const error = searchParams.get('error');
  const newSearchParams: URLSearchParams = useMemo(
    () => new URLSearchParams(searchParams.toString()),
    [searchParams],
  );

  useEffect(() => {
    if (error) {
      // 显示错误信息（这里可以集成你的消息提示组件）
      console.error('OAuth Error:', error);
      setTimeout(() => {
        navigate('/login');
        newSearchParams.delete('error');
        setSearchParams(newSearchParams);
      }, 1000);
      return;
    }

    const auth = searchParams.get('auth');
    if (auth) {
      // 存储认证信息
      localStorage.setItem('token', auth);
      newSearchParams.delete('auth');
      setSearchParams(newSearchParams);
      navigate('/');
    }
  }, [
    error,
    searchParams,
    newSearchParams,
    navigate,
    setSearchParams,
  ]);

  return searchParams.get('auth');
};

/**
 * 认证状态管理Hook
 */
export const useAuth = () => {
  const navigate = useNavigate();
  const location = useLocation();
  const [searchParams] = useSearchParams();
  const [isAuthenticated, setIsAuthenticated] = useState<boolean | null>(null);
  const [userInfo, setUserInfo] = useState<any>(null);
  const [token, setToken] = useState<string | null>(null);
  const [isLoading, setIsLoading] = useState(true);

  // OAuth回调处理
  const auth = useOAuthCallback();

  // 检查认证状态
  const checkAuthStatus = () => {
    try {
      const storedToken = localStorage.getItem('token');
      const storedUserInfo = localStorage.getItem('userInfo');
      
      if (storedToken) {
        setToken(storedToken);
        setIsAuthenticated(true);
        
        if (storedUserInfo) {
          setUserInfo(JSON.parse(storedUserInfo));
        }
      } else {
        setToken(null);
        setIsAuthenticated(false);
        setUserInfo(null);
      }
    } catch (error) {
      console.error('Error checking auth status:', error);
      setToken(null);
      setIsAuthenticated(false);
      setUserInfo(null);
    } finally {
      setIsLoading(false);
    }
  };

  // 登出功能
  const logout = () => {
    localStorage.removeItem('token');
    localStorage.removeItem('userInfo');
    setToken(null);
    setIsAuthenticated(false);
    setUserInfo(null);
    navigate('/login');
  };

  // 更新认证状态
  const updateAuthStatus = (newToken: string, newUserInfo: any) => {
    setToken(newToken);
    setUserInfo(newUserInfo);
    setIsAuthenticated(true);
    localStorage.setItem('token', newToken);
    localStorage.setItem('userInfo', JSON.stringify(newUserInfo));
  };

  // 带参数重定向到登录页面
  const redirectToLogin = (returnUrl?: string) => {
    const currentPath = returnUrl || location.pathname + location.search;
    if (currentPath !== '/login') {
      navigate(`/login?redirect=${encodeURIComponent(currentPath)}`);
    } else {
      navigate('/login');
    }
  };

  // 重定向到指定页面或首页
  const redirectAfterLogin = () => {
    const redirectUrl = searchParams.get('redirect');
    if (redirectUrl) {
      navigate(decodeURIComponent(redirectUrl));
    } else {
      navigate('/');
    }
  };

  useEffect(() => {
    checkAuthStatus();
  }, [auth]);

  return {
    isAuthenticated,
    userInfo,
    token,
    isLoading,
    checkAuthStatus,
    logout,
    updateAuthStatus,
    redirectToLogin,
    redirectAfterLogin,
  };
};

export interface LoginFormData {
  email: string;
  password: string;
  rememberEmail?: boolean;
}

export interface RegisterFormData {
  email: string;
  password: string;
  nickname: string;
}

/**
 * 登录Hook
 */
export const useLogin = () => {
  const { t } = useTranslation();
  const navigate = useNavigate();
  const [searchParams] = useSearchParams();
  const [isLoading, setIsLoading] = useState(false);

  const login = async (data: LoginFormData) => {
    setIsLoading(true);
    
    try {
      // RSA加密密码
      const encryptedPassword = rsaPsw(data.password);
      const response = await userService.login({ 
        email: data.email.trim(), 
        password: encryptedPassword 
      });

      const { data: res = {} } = response;
      const { code, message } = res;

      if (code === 0) {
        // 登录成功，处理token和用户信息
        const { data: userData } = res;
        const token = userData.access_token;
        const userInfo = {
          ...userData,
          avatar: userData.avatar,
          name: userData.nickname,
          email: userData.email,
        };
        
        // 同步更新localStorage
        localStorage.setItem('token', token);
        localStorage.setItem('userInfo', JSON.stringify(userInfo));
        
        // 直接进行重定向，不依赖React状态更新
        const redirectUrl = searchParams.get('redirect');
        if (redirectUrl) {
          navigate(decodeURIComponent(redirectUrl), { replace: true });
        } else {
          navigate('/', { replace: true });
        }
        
        return { success: true };
      } else {
        // 登录失败
        return { 
          success: false, 
          error: message || t('login.loginFailed') 
        };
      }
    } catch (error: any) {
      // 处理网络错误或其他异常
      return { 
        success: false, 
        error: error.message || t('login.networkError') 
      };
    } finally {
      setIsLoading(false);
    }
  };

  return { login, isLoading };
};

/**
 * 注册Hook
 */
export const useRegister = () => {
  const { t } = useTranslation();
  const [isLoading, setIsLoading] = useState(false);

  const register = async (data: RegisterFormData) => {
    setIsLoading(true);
    
    try {
      // RSA加密密码
      const encryptedPassword = rsaPsw(data.password);
      
      const response = await userService.register({
        nickname: data.nickname,
        email: data.email.trim(),
        password: encryptedPassword
      });

      const { data: res = {} } = response;
      const { code, message } = res;
      
      if (code === 0) {
        // 注册成功
        return { 
          success: true, 
          email: data.email 
        };
      } else {
        // 注册失败
        return { 
          success: false, 
          error: message || t('login.registerFailed') 
        };
      }
    } catch (error: any) {
      // 处理网络错误或其他异常
      return { 
        success: false, 
        error: error.message || t('login.networkError') 
      };
    } finally {
      setIsLoading(false);
    }
  };

  return { register, isLoading };
};

/**
 * 登录表单管理Hook
 */
export const useLoginForm = () => {
  const { t } = useTranslation();
  const [tabValue, setTabValue] = useState(0); // 0: 登录, 1: 注册
  const [error, setError] = useState('');

  // 登录表单
  const loginForm = useForm<LoginFormData>({
    defaultValues: {
      email: '',
      password: '',
      rememberEmail: false
    }
  });

  // 注册表单
  const registerForm = useForm<RegisterFormData>({
    defaultValues: {
      email: '',
      password: '',
      nickname: ''
    }
  });

  const handleTabChange = (event: React.SyntheticEvent, newValue: number) => {
    setTabValue(newValue);
    setError('');
    // 清空表单错误
    loginForm.clearErrors();
    registerForm.clearErrors();
  };

  const switchToLogin = (email?: string) => {
    setTabValue(0);
    setError('');
    if (email) {
      loginForm.setValue('email', email);
    }
  };

  const setFormError = (errorMessage: string) => {
    setError(errorMessage);
  };

  const clearError = () => {
    setError('');
  };

  return {
    // 表单状态
    tabValue,
    setTabValue,
    error,
    loginForm,
    registerForm,
    
    // 表单操作
    handleTabChange,
    switchToLogin,
    setFormError,
    clearError,
    
    // 表单验证规则
    loginValidation: {
      email: { 
        required: t('login.emailPlaceholder'),
        pattern: {
          value: /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}$/i,
          message: t('login.emailInvalid')
        }
      },
      password: { 
        required: t('login.passwordPlaceholder'),
        minLength: {
          value: 6,
          message: t('login.passwordMinLength')
        }
      }
    },
    registerValidation: {
      nickname: { 
        required: t('login.nicknamePlaceholder'),
        minLength: {
          value: 2,
          message: t('login.nicknameMinLength')
        }
      },
      email: { 
        required: t('login.emailPlaceholder'),
        pattern: {
          value: /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}$/i,
          message: t('login.emailInvalid')
        }
      },
      password: { 
        required: t('login.passwordPlaceholder'),
        minLength: {
          value: 8,
          message: t('login.passwordMinLength')
        }
      }
    }
  };
};

/**
 * 登录页面主Hook - 整合所有登录相关逻辑
 */
export const useLoginPage = () => {
  const loginHook = useLogin();
  const registerHook = useRegister();
  const formHook = useLoginForm();

  const handleLogin = async (data: LoginFormData) => {
    formHook.clearError();
    const result = await loginHook.login(data);
    
    if (!result.success && result.error) {
      formHook.setFormError(result.error);
    }
    
    return result;
  };

  const handleRegister = async (data: RegisterFormData) => {
    formHook.clearError();
    const result = await registerHook.register(data);
    
    if (result.success) {
      // 注册成功，切换到登录表单并填入邮箱
      formHook.registerForm.reset();
      formHook.switchToLogin(result.email);
    } else if (result.error) {
      formHook.setFormError(result.error);
    }
    
    return result;
  };

  const isSubmitting = loginHook.isLoading || registerHook.isLoading;

  return {
    // 表单相关
    ...formHook,
    
    // 提交处理
    handleLogin,
    handleRegister,
    isSubmitting,
  };
};