import { ApolloClient, InMemoryCache, createHttpLink } from '@apollo/client';
import { setContext } from '@apollo/client/link/context';

// 创建HTTP链接
const httpLink = createHttpLink({
    uri: process.env.NEXT_PUBLIC_GRAPHQL_BACKEND_URL || 'http://localhost:4000/graphql',
});

// 认证链接
const authLink = setContext((_, { headers }) => {
    // 从localStorage或cookie获取token
    const token = typeof window !== 'undefined' ? localStorage.getItem('token') : null;

    return {
        headers: {
            ...headers,
            authorization: token ? `Bearer ${token}` : "",
        }
    }
});

// 创建Apollo客户端
export const gqlClient = new ApolloClient({
    link: authLink.concat(httpLink),
    cache: new InMemoryCache(),
    ssrMode: typeof window === 'undefined',
});

// 服务端专用的客户端（无认证）
export const serverGqlClient = new ApolloClient({
    link: httpLink,
    cache: new InMemoryCache(),
    ssrMode: true,
});