/**
 * config-service GraphQL 子图模块（v2.1 M3）
 *
 * Apollo Federation 2 子图，提供 4 类 Entity 查询：
 * - PluginRegistry（@key(fields: "pluginId")）
 * - RolePluginMapping
 * - LayoutTemplate
 * - UserLayoutOverride（@key(fields: "userId")）
 *
 * 强制约束：
 * - @key 解析器必须使用 DataLoader（ADR-035）
 * - RouterAuthGuard 校验 Router-Authorization Header（ADR-036）
 */
import { Module } from "@nestjs/common";
import { GraphQLModule } from "@nestjs/graphql";
import { ApolloFederationDriver, ApolloDriverConfig } from "@nestjs/apollo";
import { join } from "node:path";
import { GraphqlContext } from "@edu/shared-ts/federation";
import { ConfigModule } from "../config-config/config.module.js";
import { PluginResolver } from "./resolvers/plugin.resolver.js";
import { LayoutTemplateResolver } from "./resolvers/layout-template.resolver.js";
import { UserLayoutResolver } from "./resolvers/user-layout.resolver.js";
import { PluginConfigResolver } from "./resolvers/plugin-config.resolver.js";
import { DataLoaderService } from "./dataloader.service.js";

@Module({
  imports: [
    ConfigModule,
    GraphQLModule.forRoot<ApolloDriverConfig>({
      driver: ApolloFederationDriver,
      // Federation 2 子图
      autoSchemaFile: {
        path: join(process.cwd(), "src/graphql/generated/schema.graphql"),
        federation: 2,
      },
      // /graphql 端点（Apollo Router 访问入口）
      path: "/graphql",
      // 禁用 playground（生产环境通过 Router 访问）
      playground: process.env.NODE_ENV === "development",
      introspection: process.env.NODE_ENV === "development",
      // Context 从 HTTP headers 构造
      context: (ctx: {
        req: { headers: Record<string, string | undefined> };
      }) => ({
        req: ctx.req,
        graphqlContext: GraphqlContext.fromHeaders(ctx.req.headers),
      }),
    }),
  ],
  providers: [
    PluginResolver,
    LayoutTemplateResolver,
    UserLayoutResolver,
    PluginConfigResolver,
    DataLoaderService,
  ],
  exports: [DataLoaderService],
})
export class GraphqlModule {}