import { BASE_URL } from "@/api/constants";
import { post } from "@/api/request";

// API配置
const API_BASE_URL = process.env.NEXT_PUBLIC_BASE_URL || '';
const JAVA_BASE_URL = process.env.NEXT_PUBLIC_JAVA_URL || '';
// Token存储键
const TOKEN_KEY = 'token';
const USER_KEY = 'currentUser';

/**
 * 登录用户
 */
export const loginUser = async (email: string, password: string) => {
  try {
    const response = await fetch(`${JAVA_BASE_URL}/api/user/login`, {
      method: 'POST',
      headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        username: email,
        password: password,
      }),
    });

    const data = await response.json();
    if(!data.success){
      throw new Error(data.message)
    }
    // 保存token到本地存储
    setToken(data.token);

    const user = await getUserProfile();

    return user;
  } catch (error) {
    console.error('Login failed:', error);
    throw error;
  }
};

/**
 * 获取token
 */
export const getToken = (): string | null => {
  if (typeof window === 'undefined') return null;
  return localStorage.getItem(TOKEN_KEY);
};

/**
 * 设置token
 */
export const setToken = (token: string) => {
  if (typeof window === 'undefined') return;
  localStorage.setItem(TOKEN_KEY, token);
};

/**
 * 获取当前用户
 */
export const getCurrentUser = () => {
  if (typeof window === 'undefined') return null;

  const userJson = localStorage.getItem(USER_KEY);
  if (!userJson) return null;

  try {
    return JSON.parse(userJson);
  } catch (error) {
    console.error('Failed to parse user data from storage', error);
    return null;
  }
};

/**
 * 设置用户信息
 */
export const setUser = (user: any) => {
  if (typeof window === 'undefined') return;
  localStorage.setItem(USER_KEY, JSON.stringify(user));
};

/**
 * 清除认证数据
 */
export const clearAuthData = () => {
  if (typeof window === 'undefined') return;
  localStorage.removeItem(TOKEN_KEY);
  localStorage.removeItem(USER_KEY);
};

/**
 * 用户登出
 */
export const logoutUser = () => {
  clearAuthData();
  window.location.href = '/login';
};

/**
 * 检查是否已登录
 */
export const isAuthenticated = (): boolean => {
  return !!getToken();
};

/**
 * 创建带有token的请求头
 */
export const getAuthHeaders = () => {
  const token = getToken();
  return {
    'Accept': 'application/json',
    'Content-Type': 'application/json',
    ...(token && { 'X-EASE-ADMIN-TOKEN': token }),
  };
};

/**
 * 带有自动token处理的fetch封装
 */
export const authFetch = async (url: string, options: RequestInit = {}) => {
  const token = getToken();

  if (!token) {
    throw new Error('No token available');
  }

  const headers = {
    'Accept': 'application/json',
    'Content-Type': 'application/json',
    'X-EASE-ADMIN-TOKEN': token,
    ...options.headers,
  };

  const response = await fetch(url, {
    ...options,
    headers,
  });

  // 检查是否token过期
  if (response.status === 401) {
    const data = await response.json();
    if (data.code === '401') {
      // Token过期，清除本地数据并重定向到登录页
      clearAuthData();
      window.location.href = '/login';
      throw new Error('Token expired');
    }
  }

  return response;
};

// Google OAuth相关函数保持不变
const GOOGLE_CLIENT_ID = '1016208801816-qtvcvki2jobmcin1g4e7u4sotr0p8g3u.apps.googleusercontent.com';
const GOOGLE_REDIRECT_URI = typeof window !== 'undefined'
  ? BASE_URL+'/users/oauth/callback'
  : '';

/**
 * Initiates Google OAuth authentication flow
 */
export const signInWithGoogle = () => {
  const state = generateOAuthState();

  const params = new URLSearchParams({
    client_id: GOOGLE_CLIENT_ID,
    redirect_uri: GOOGLE_REDIRECT_URI,
    response_type: 'code',
    scope: 'email profile',
    prompt: 'select_account',
    state: state,
  });

  // Redirect to Google's OAuth endpoint
  window.location.href = `https://accounts.google.com/o/oauth2/v2/auth?${params.toString()}`;
};

/**
 * Generates and stores a state parameter for OAuth to prevent CSRF attacks
 */
export const generateOAuthState = () => {
  if (typeof window === 'undefined') return '';

  // Generate a random string for state
  const state = Math.random().toString(36).substring(2, 15);

  // Store the state in session storage to validate later
  sessionStorage.setItem('oauthState', state);

  return state;
};

/**
 * Validates the state parameter returned from OAuth to prevent CSRF attacks
 */
export const validateOAuthState = (state: string): boolean => {
  if (typeof window === 'undefined') return false;

  const storedState = sessionStorage.getItem('oauthState');

  // Clean up the stored state regardless of validity
  sessionStorage.removeItem('oauthState');

  // Validate that the returned state matches what we stored
  return state === storedState;
};

/**
 * 获取用户信息
 * @returns {Promise<any>} 用户信息对象
 */
export const getUserProfile = async (): Promise<any> => {
  // const t =  {
  //   id: 'fcb6768b6f49449387e6617f75baabc0',
  //   userId: 'fcb6768b6f49449387e6617f75baabc0',
  //   username: 'gxy',
  //   name: 'gxy',
  //   email: 'moviflow66@test.com',
  //   role: 'USER',
  //   isActive: 1,
  //   authType: 'LOCAL',
  //   lastLogin: new Date(),
  // }
  // setUser(t);
  // return t;
  try {
    const token = getToken();
    if (!token) {
      throw new Error('No token available');
    }

    const response = await fetch(`${API_BASE_URL}/auth/profile`, {
      method: 'GET',
      headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${token}`,
      },
    });

    if (!response.ok) {
      throw new Error(response.status.toString());
    }

    const data = await response.json();

    if (data.code === 0 && data.successful) {
      // 更新本地存储的用户信息
      const userInfo = {
        id: data.data.user_id,
        userId: data.data.user_id,
        username: data.data.username,
        name: data.data.name,
        email: data.data.email,
        role: data.data.role,
        isActive: data.data.is_active,
        authType: data.data.auth_type,
        lastLogin: data.data.last_login,
      };

      setUser(userInfo);
      return userInfo;
    } else {
      throw new Error(data.message || 'Failed to get user profile');
    }
  } catch (error) {
    console.error('Get user profile failed:', error);
    throw error;
  }
};

/**
 * 刷新用户信息
 * @returns {Promise<any>} 最新的用户信息
 */
export const refreshUserProfile = async (): Promise<any> => {
  try {
    const profile = await getUserProfile();
    return profile;
  } catch (error) {
    console.error('Refresh user profile failed:', error);
    // 如果刷新失败，返回本地存储的用户信息
    return getCurrentUser();
  }
};

/**
 * 检查用户权限
 * @param {string} requiredRole 需要的角色权限
 * @returns {boolean} 是否有权限
 */
export const checkUserPermission = (requiredRole: string): boolean => {
  const user = getCurrentUser();
  if (!user || !user.role) {
    return false;
  }

  // 角色权限等级
  const roleHierarchy = {
    'ADMIN': 3,
    'MODERATOR': 2,
    'USER': 1,
  };

  const userRoleLevel = roleHierarchy[user.role as keyof typeof roleHierarchy] || 0;
  const requiredRoleLevel = roleHierarchy[requiredRole as keyof typeof roleHierarchy] || 0;

  return userRoleLevel >= requiredRoleLevel;
};

/**
 * 检查用户是否激活
 * @returns {boolean} 用户是否激活
 */
export const isUserActive = (): boolean => {
  const user = getCurrentUser();
  return user?.isActive === 1;
};
/**
 * 用户注册
 * @param {Object} params - 注册参数
 * @param {string} params.userName - 用户名
 * @param {string} params.password - 密码
 * @param {string} params.email - 邮箱
 * @param {string} [params.inviteCode] - 邀请码（可选）
 * @returns {Promise<any>} 注册结果
 * @throws {Error} 注册失败时抛出异常
 */
export const registerUser = async ({
  userName,
  password,
  email,
  inviteCode,
}: {
  userName: string;
  password: string;
  email: string;
  inviteCode?: string;
}): Promise<any> => {
  try {
    const response = await fetch(`${JAVA_BASE_URL}/api/user/register`, {
      method: 'POST',
      headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        userName,
        password,
        email,
        inviteCode,
      }),
    });

    const data = await response.json();
    console.log('data', data)
    if(!data.success){
      throw new Error(data.message||data.msg)
    }
    return data as {
      success: boolean;
    };
  } catch (error) {
    console.error('Register failed:', error);
    throw error;
  }
};