import ApolloServerPluginResponseCache from "@apollo/server-plugin-response-cache";
import type { GraphQLRequestContext } from "@apollo/server";

/**
 * Response Caching Plugin für Apollo Server
 * Cached GraphQL Responses basierend auf Query und Variablen
 */
export const createResponseCachePlugin = () => {
  return ApolloServerPluginResponseCache({
    // Session-ID für User-spezifisches Caching
    sessionId: async (
      requestContext: GraphQLRequestContext<any>
    ): Promise<string | null> => {
      // Optional: User-ID aus Headers oder Context
      const userId = requestContext.request.http?.headers.get("x-user-id");
      return userId || null;
    },

    // Cache nur bei erfolgreichen Queries
    shouldWriteToCache: async (
      requestContext: GraphQLRequestContext<any>
    ): Promise<boolean> => {
      const query = requestContext.request.query;

      if (!query) return false;

      // Cache nur bestimmte Queries
      const cacheableQueries = ["products", "pageSeo", "navigation", "page"];
      return cacheableQueries.some((q) => query.includes(q));
    },
  });
};