import { GRAPHQL_URL } from "@/utils/constants";
import { HttpLink,ApolloLink } from "@apollo/client";
import { SetContextLink } from "@apollo/client/link/context";
import {
  registerApolloClient,
  ApolloClient,
  InMemoryCache,
} from "@apollo/client-integration-nextjs";

// apollo client 底层还是调的nextjs的fetch函数。
// apollo client 的缓存策略是建立在nextjs缓存策略之上的，相当于两个沙盒
// 这里注册的是服务端的apollo client。项目中服务端使用的apollo client只是用于query 查询，而且不需要Authorization

export const { getClient, query, PreloadQuery } = registerApolloClient(() => {

    const httpLink = new HttpLink({
        uri: GRAPHQL_URL,
        credentials: "include",
        /*
      fetchOptions: {
        // Optional: Next.js-specific fetch options for caching and revalidation
        // See: https://nextjs.org/docs/app/api-reference/functions/fetch
      },
      */
    });
    const authLink = new SetContextLink((prevContext, operation) => {
        const storefrontKey =
            process.env.BAGISTO_STOREFRONT_KEY ||
            process.env.NEXT_PUBLIC_BAGISTO_STOREFRONT_KEY ||
            "";

        return {
            headers: {
            ...prevContext.headers,
            "X-STOREFRONT-KEY": storefrontKey,
            },
        };

    });

    const link = ApolloLink.from([authLink, httpLink]);

  return new ApolloClient({
    cache: new InMemoryCache(),
    link: link
  });
});