import path from "node:path";
import vue from "@vitejs/plugin-vue";
import { defineConfig, type Plugin } from "vite";
import { VitePWA } from "vite-plugin-pwa";

/**
 * Recover browsers that visited this hostname while Docker still served Vite's
 * development mode. Its development worker can retain HTML that imports
 * `/@vite/client` and `/src/main.ts`; a normal static fallback would return
 * HTML for those module URLs and leave the visitor on a blank screen.
 *
 * This preview-only compatibility endpoint is requested only by that obsolete
 * shell. It clears the old origin-local worker/cache state and writes the
 * current production HTML into the document. The production application then
 * registers the real `/sw.js` worker normally.
 */
function legacyDevelopmentWorkerMigration(): Plugin {
  const migrationSource = `
void (async () => {
  if ("serviceWorker" in navigator) {
    const registrations = await navigator.serviceWorker.getRegistrations();
    await Promise.all(registrations.map((registration) => registration.unregister()));
  }
  if ("caches" in window) {
    const names = await caches.keys();
    await Promise.all(names.map((name) => caches.delete(name)));
  }

  const productionDocument = await fetch(
    "/index.html?origin-pwa-migration=" + Date.now(),
    { cache: "no-store" },
  );
  const html = await productionDocument.text();
  document.open();
  document.write(html);
  document.close();
})();
`;

  return {
    name: "origins-legacy-development-worker-migration",
    configurePreviewServer(server) {
      server.middlewares.use((request, response, next) => {
        const pathname = new URL(request.url ?? "/", "http://origins.local")
          .pathname;

        if (pathname === "/@vite/client") {
          response.statusCode = 200;
          response.setHeader("Content-Type", "text/javascript; charset=utf-8");
          response.setHeader("Cache-Control", "no-store");
          response.end(
            "// Compatibility stub for the retired Vite dev client.",
          );
          return;
        }

        if (pathname === "/src/main.ts") {
          response.statusCode = 200;
          response.setHeader("Content-Type", "text/javascript; charset=utf-8");
          response.setHeader("Cache-Control", "no-store");
          response.end(migrationSource);
          return;
        }

        next();
      });
    },
  };
}

export default defineConfig({
  root: __dirname,
  base: "./",
  // Reuse the workspace's existing install icons rather than maintaining a
  // second set that can silently drift from the main demo.
  publicDir: path.resolve(__dirname, "../../public"),
  plugins: [
    vue(),
    legacyDevelopmentWorkerMigration(),
    VitePWA({
      registerType: "autoUpdate",
      devOptions: {
        // The hosted Docker service runs Vite's development server, so its
        // public HTTPS URL also needs a real manifest and service worker.
        enabled: true,
        navigateFallback: "index.html",
        suppressWarnings: true,
      },
      includeAssets: [
        "favicon.svg",
        "app-icon.svg",
        "apple-touch-icon.png",
        "pwa-192.png",
        "pwa-512.png",
      ],
      manifest: {
        id: "/",
        name: "Routeless Origins Lab",
        short_name: "Origins Lab",
        description:
          "Seven interactive labs for a routeless Vue animation and gesture engine.",
        theme_color: "#080b12",
        background_color: "#080b12",
        display: "standalone",
        scope: "/",
        start_url: "/",
        orientation: "any",
        icons: [
          {
            src: "/pwa-192.png",
            sizes: "192x192",
            type: "image/png",
            purpose: "any",
          },
          {
            src: "/pwa-512.png",
            sizes: "512x512",
            type: "image/png",
            purpose: "any",
          },
          {
            src: "/pwa-512.png",
            sizes: "512x512",
            type: "image/png",
            purpose: "maskable",
          },
          {
            src: "/app-icon.svg",
            sizes: "any",
            type: "image/svg+xml",
            purpose: "any",
          },
        ],
      },
      workbox: {
        cleanupOutdatedCaches: true,
        clientsClaim: true,
        skipWaiting: true,
        navigateFallback: "/index.html",
        globPatterns: ["**/*.{js,css,html,svg,png,woff2}"],
      },
    }),
  ],
  server: {
    // The development container is reached through this Traefik hostname.
    // Keeping the allow-list explicit preserves Vite's DNS-rebinding defense.
    allowedHosts: ["v2.demo.native-router.harvmaster.com"],
  },
  preview: {
    allowedHosts: ["v2.demo.native-router.harvmaster.com"],
  },
  resolve: {
    alias: [
      {
        find: /^@native-vue-router\/core-v2\/style\.css$/,
        replacement: path.resolve(
          __dirname,
          "../../packages/core-v2/src/style.css",
        ),
      },
      {
        find: /^@native-vue-router\/core-v2$/,
        replacement: path.resolve(
          __dirname,
          "../../packages/core-v2/src/index.ts",
        ),
      },
    ],
  },
  build: {
    outDir: path.resolve(__dirname, "dist"),
    emptyOutDir: true,
  },
});