'use client';

import React, { createContext, useContext, useEffect, useState } from 'react';
import { useRouter } from 'next/navigation';
import { Session, User } from '@supabase/supabase-js';
import supabase from './supabase';
import { limqRequest } from './api';

// 定义用户类型
export type AuthUser = User | null;

// 定义验证上下文类型
export type AuthContextType = {
  user: AuthUser;
  session: Session | null;
  isLoading: boolean;
  signIn: (email: string, password: string) => Promise<{ error?: unknown }>;
  signInWithGoogle: () => Promise<{ error?: unknown }>;
  signInWithGitHub: () => Promise<{ error?: unknown }>;
  signUp: (email: string, password: string) => Promise<void>;
  signOut: () => Promise<void>;
};

// 创建验证上下文
const AuthContext = createContext<AuthContextType | undefined>(undefined);

// 验证提供者组件
export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
  const [user, setUser] = useState<AuthUser>(null);
  const [session, setSession] = useState<Session | null>(null);
  const [isLoading, setIsLoading] = useState(true);
  const router = useRouter();

  // 初始化验证状态
  useEffect(() => {
    const getSession = async () => {
      setIsLoading(true);
      try {
        // 尝试从Supabase获取会话
        const { data: { session }, error } = await supabase.auth.getSession();
        
        if (error) {
          console.error('Error getting session:', error);
          return;
        }
        
        setSession(session);
        setUser(session?.user || null);
      } catch (error) {
        console.error('Unexpected error during getSession:', error);
      } finally {
        setIsLoading(false);
      }
    };

    getSession();

    // 监听验证状态变化
    const { data: { subscription } } = supabase.auth.onAuthStateChange((_event, session) => {
      setSession(session);
      setUser(session?.user || null);
    });

    // 清理函数
    return () => {
      subscription.unsubscribe();
    };
  }, []);

  // 登录函数
  const signIn = async (email: string, password: string) => {
    setIsLoading(true);
    try {
      console.log('尝试登录:', { email });
      
      // 尝试通过Supabase登录
      const { data, error } = await supabase.auth.signInWithPassword({
        email,
        password,
      });

      if (error) {
        console.error('登录出错:', error);
        return { error };
      }

      setSession(data.session);
      setUser(data.user);
      
      router.push('/analytics');
      return {};
    } catch (error) {
      console.error('登录过程出错:', error);
      return { error };
    } finally {
      setIsLoading(false);
    }
  };

  // Google登录函数
  const signInWithGoogle = async () => {
    setIsLoading(true);
    try {
      // 获取网站 URL，如果环境变量不存在则使用当前来源
      const siteUrl = process.env.NEXT_PUBLIC_SITE_URL || window.location.origin;
      
      // 尝试通过Supabase登录Google
      const { error } = await supabase.auth.signInWithOAuth({
        provider: 'google',
        options: {
          redirectTo: `${siteUrl}/auth/callback`,
        },
      });

      if (error) {
        console.error('Google登录出错:', error);
        return { error };
      }
      
      return {}; // Return empty object when successful
    } catch (error) {
      console.error('Google登录过程出错:', error);
      return { error };
    } finally {
      setIsLoading(false);
    }
  };

  // GitHub登录函数
  const signInWithGitHub = async () => {
    setIsLoading(true);
    try {
      // 获取网站 URL，如果环境变量不存在则使用当前来源
      const siteUrl = process.env.NEXT_PUBLIC_SITE_URL || window.location.origin;
      
      // 尝试通过Supabase登录GitHub
      const { error } = await supabase.auth.signInWithOAuth({
        provider: 'github',
        options: {
          redirectTo: `${siteUrl}/auth/callback`,
        },
      });

      if (error) {
        console.error('GitHub login error:', error);
        return { error };
      }
      
      return {}; // Return empty object when successful
    } catch (error) {
      console.error('GitHub login process error:', error);
      return { error };
    } finally {
      setIsLoading(false);
    }
  };

  // 注册函数
  const signUp = async (email: string, password: string) => {
    setIsLoading(true);
    try {
      // 获取网站 URL，如果环境变量不存在则使用当前来源
      const siteUrl = process.env.NEXT_PUBLIC_SITE_URL || window.location.origin;
      
      // 尝试通过Supabase注册
      const { error } = await supabase.auth.signUp({
        email,
        password,
        options: {
          emailRedirectTo: `${siteUrl}/auth/callback`,
        }
      });

      if (error) {
        console.error('注册出错:', error);
        throw error;
      }

      // 注册成功后跳转到登录页面并显示确认消息
      router.push('/login?message=Registration successful! Please check your email to verify your account before logging in.');
    } catch (error) {
      console.error('注册过程出错:', error);
      throw error;
    } finally {
      setIsLoading(false);
    }
  };

  // 登出函数
  const signOut = async () => {
    setIsLoading(true);
    try {
      // 尝试通过Supabase登出
      const { error } = await supabase.auth.signOut();
      if (error) {
        console.error('登出出错:', error);
        throw error;
      }
      setSession(null);
      setUser(null);
      router.push('/login');
    } catch (error) {
      console.error('登出过程出错:', error);
      throw error;
    } finally {
      setIsLoading(false);
    }
  };

  const contextValue: AuthContextType = {
    user,
    session,
    isLoading,
    signIn,
    signInWithGoogle,
    signInWithGitHub,
    signUp,
    signOut,
  };

  return (
    <AuthContext.Provider value={contextValue}>
      {children}
    </AuthContext.Provider>
  );
};

// 自定义钩子
export const useAuth = () => {
  const context = useContext(AuthContext);
  if (context === undefined) {
    throw new Error('useAuth must be used within an AuthProvider');
  }
  return context;
};

// 受保护路由组件
export const ProtectedRoute: React.FC<{ children: React.ReactNode }> = ({ children }) => {
  const { user, isLoading } = useAuth();
  const router = useRouter();

  useEffect(() => {
    if (!isLoading && !user) {
      router.push('/login');
    }
  }, [user, isLoading, router]);

  if (isLoading) {
    return (
      <div className="flex items-center justify-center min-h-screen">
        <div className="text-center">
          <div className="animate-spin rounded-full h-16 w-16 border-t-2 border-b-2 border-blue-500 mx-auto"></div>
          <p className="mt-4 text-lg text-gray-700 dark:text-gray-300">加载中...</p>
        </div>
      </div>
    );
  }

  if (!user) {
    return null;
  }

  return <>{children}</>;
};

export default AuthContext;