🔧 Added graphQL bits

services/graphql.service.ts

@@ -0,0 +1,116 @@
+// services/graphql.service.ts
+import { gql as ApolloMixin } from "@ltv/moleculer-apollo-server-mixin";
+import { print } from "graphql";
+import { typeDefs } from "../models/graphql/typedef";
+import { ServiceSchema } from "moleculer";
+
+/**
+ * Interface representing the structure of an ElasticSearch result.
+ */
+interface SearchResult {
+	hits: {
+		total: { value: number };
+		hits: any[];
+	};
+}
+
+/**
+ * GraphQL Moleculer Service exposing typed resolvers via @ltv/moleculer-apollo-server-mixin.
+ * Includes resolver for fetching comics marked as "wanted".
+ */
+const GraphQLService: ServiceSchema = {
+	name: "graphql",
+	mixins: [ApolloMixin],
+
+	actions: {
+		/**
+		 * Resolver for fetching comics marked as "wanted" in ElasticSearch.
+		 *
+		 * Queries the `search.issue` Moleculer action using a filtered ES query
+		 * that matches issues or volumes with a `wanted` flag.
+		 *
+		 * @param {number} [limit=25] - Maximum number of results to return.
+		 * @param {number} [offset=0] - Starting index for paginated results.
+		 * @returns {Promise<{ total: number, comics: any[] }>} - Total number of matches and result set.
+		 *
+		 * @example
+		 * query {
+		 *   wantedComics(limit: 10, offset: 0) {
+		 *     total
+		 *     comics {
+		 *       _id
+		 *       _source {
+		 *         title
+		 *       }
+		 *     }
+		 *   }
+		 * }
+		 */
+		wantedComics: {
+			params: {
+				limit: {
+					type: "number",
+					integer: true,
+					min: 1,
+					optional: true,
+				},
+				offset: {
+					type: "number",
+					integer: true,
+					min: 0,
+					optional: true,
+				},
+			},
+			async handler(ctx) {
+				const { limit = 25, offset = 0 } = ctx.params;
+
+				const eSQuery = {
+					bool: {
+						should: [
+							{ exists: { field: "wanted.issues" } },
+							{ exists: { field: "wanted.volume" } },
+						],
+						minimum_should_match: 1,
+					},
+				};
+
+				const result = (await ctx.broker.call("search.issue", {
+					query: eSQuery,
+					pagination: { size: limit, from: offset },
+					type: "wanted",
+					trigger: "wantedComicsGraphQL",
+				})) as SearchResult;
+
+				return {
+					data: {
+						wantedComics: {
+							total: result?.hits?.total?.value || 0,
+							comics:
+								result?.hits?.hits.map((hit) => hit._source) ||
+								[],
+						},
+					},
+				};
+			},
+		},
+	},
+
+	settings: {
+		apolloServer: {
+			typeDefs: print(typeDefs), // If typeDefs is AST; remove print if it's raw SDL string
+			resolvers: {
+				Query: {
+					wantedComics: "graphql.wantedComics",
+				},
+			},
+			path: "/graphql",
+			playground: true,
+			introspection: true,
+			context: ({ ctx }: any) => ({
+				broker: ctx.broker,
+			}),
+		},
+	},
+};
+
+export default GraphQLService;