// parent-portal next.config.js
// Module Federation Remote 角色（Shell = teacher-portal :4000）
// 当 NEXT_PUBLIC_MF_ENABLED=enabled 时启用 MF；否则作为独立 Next.js 应用运行
//
// 依据：
// - 02-architecture-design.md §1.2 MF 配置
// - ARB-002 MF Shell 暴露清单
// - F10 MF 暴露粒度（AppShell 整体）
// - F9 GraphQL（urql）

const NextFederationPlugin =
  process.env.NEXT_PUBLIC_MF_ENABLED === "enabled"
    ? require("@module-federation/nextjs-mf")
    : null;

const remotes = (isServer) => ({
  teacher: `teacher_app@http://localhost:4000/_next/static/${isServer ? "ssr" : "chunks"}/remoteEntry.js`,
});

/** @type {import('next').NextConfig} */
const nextConfig = {
  reactStrictMode: true,
  // ESM 兼容（MF 2.0 需要）
  experimental: {
    externalDir: true,
  },
  // 安全头（F-安全硬化，复用 Shell 配置）
  async headers() {
    return [
      {
        source: "/(.*)",
        headers: [
          { key: "X-Frame-Options", value: "SAMEORIGIN" },
          { key: "X-Content-Type-Options", value: "nosniff" },
          { key: "Referrer-Policy", value: "strict-origin-when-cross-origin" },
          {
            key: "Permissions-Policy",
            value: "camera=(), microphone=(), geolocation=()",
          },
        ],
      },
    ];
  },
  // API 代理：/api/v1/* → api-gateway
  async rewrites() {
    return [
      {
        source: "/api/v1/:path*",
        destination: `${process.env.API_GATEWAY_URL || "http://localhost:8080"}/api/v1/:path*`,
      },
    ];
  },
};

// MF Remote 配置（仅当 NEXT_PUBLIC_MF_ENABLED=enabled 时启用）
if (NextFederationPlugin) {
  const originalWebpack = nextConfig.webpack;
  nextConfig.webpack = (config, options) => {
    config.plugins.push(
      new NextFederationPlugin({
        name: "parent_app",
        filename: "static/chunks/remoteEntry.js",
        remotes: remotes(options.isServer),
        exposes: {
          "./pages": "./src/pages",
          "./ChildSwitcher": "./src/components/ChildSwitcher",
        },
        shared: {
          react: { singleton: true, requiredVersion: "^18.3.0" },
          "react-dom": { singleton: true, requiredVersion: "^18.3.0" },
          urql: { singleton: true },
          graphql: { singleton: true },
          "@tanstack/react-query": { singleton: true },
          zustand: { singleton: true },
          nuqs: { singleton: true },
        },
        extraOptions: { exposePages: false },
      }),
    );
    if (typeof originalWebpack === "function") {
      return originalWebpack(config, options);
    }
    return config;
  };
}

module.exports = nextConfig;