import { createClient, SupabaseClient } from "@supabase/supabase-js";
import type { Database } from "@/types/supabase";

let supabase: SupabaseClient<Database> | null = null;

// 增强的存储适配器，使用localStorage并添加更多错误处理
const storageAdapter = {
  getItem: async (key: string) => {
    try {
      const item = localStorage.getItem(key);
      console.log(`Storage get for key [${key}]: ${item ? "found" : "not found"}`);
      return item;
    } catch (error) {
      console.error("Storage get error:", error);
      return null;
    }
  },

  setItem: async (key: string, value: string) => {
    try {
      localStorage.setItem(key, value);
      console.log(`Storage set for key [${key}] successful`);
    } catch (error) {
      console.error("Storage set error:", error);
    }
  },

  removeItem: async (key: string) => {
    try {
      localStorage.removeItem(key);
      console.log(`Storage remove for key [${key}] successful`);
    } catch (error) {
      console.error("Storage remove error:", error);
    }
  },
};

// 添加一个函数来检查Supabase连接状态
export const checkSupabaseConnection = async (): Promise<boolean> => {
  try {
    const client = getSupabaseClient();
    const { error } = await client.from('_health').select('*').limit(1);
    
    if (error) {
      console.error('Supabase connection check failed:', error);
      return false;
    }
    
    console.log('Supabase connection check successful');
    return true;
  } catch (error) {
    console.error('Supabase connection check exception:', error);
    return false;
  }
};

export const getSupabaseClient = (): SupabaseClient<Database> => {
  if (!supabase) {
    if (!process.env.NEXT_PUBLIC_SUPABASE_URL || !process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY) {
      console.error('Missing Supabase environment variables');
      throw new Error('Missing Supabase environment variables');
    }

    console.log('Creating new Supabase client with URL:', process.env.NEXT_PUBLIC_SUPABASE_URL);
    
    // 使用as断言来避免类型错误
    supabase = createClient<Database>(
      process.env.NEXT_PUBLIC_SUPABASE_URL,
      process.env.NEXT_PUBLIC_SUPABASE_ANON_KEY,
      {
        db: { schema: "limq" },
        auth: {
          storage: storageAdapter,
          persistSession: true,
          autoRefreshToken: true,
          detectSessionInUrl: true,
        },
      }
    ) as SupabaseClient<Database>;
    
    // 立即检查客户端创建后的会话状态
    void supabase.auth.getSession().then(({ data: { session } }) => {
      console.log('Initial session check:', session ? 'Session exists' : 'No session');
    }).catch(err => {
      console.error('Error checking initial session:', err);
    });
  }
  
  if (!supabase) {
    throw new Error('Failed to create Supabase client');
  }
  
  return supabase;
};

export const clearSupabaseInstance = () => {
  console.log('Clearing Supabase instance');
  supabase = null;
};