import tailwindcss from "@tailwindcss/vite";
import fs from "fs";
import path from "path";
import { fileURLToPath } from "url";
import { defineConfig, loadEnv, type Plugin } from "vite";
import { createHtmlPlugin } from "vite-plugin-html";
import tsconfigPaths from "vite-tsconfig-paths";
import { type AssetManifest, buildAssetUrl } from "./src/core/AssetUrls";
import {
  buildPublicAssetManifest,
  copyRootPublicFiles,
  createHashedPublicAssetFiles,
  getProprietaryDir,
  getResourcesDir,
  writePublicAssetManifestModule,
} from "./src/server/PublicAssetManifest";

// Vite already handles these, but its good practice to define them explicitly
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

function serveProprietaryDir(dir: string): Plugin {
  const resolvedDir = path.resolve(dir) + path.sep;
  return {
    name: "serve-proprietary-dir",
    configureServer(server) {
      // Return a function so the middleware is registered after Vite's internal
      // static-file handler (publicDir).  This makes proprietary/ a fallback
      // rather than taking precedence over resources/.
      return () => {
        server.middlewares.use((req, res, next) => {
          if (!req.url) return next();
          const urlPath = new URL(req.url, "http://localhost").pathname;
          const filePath = path.resolve(
            dir,
            decodeURIComponent(urlPath).replace(/^\//, ""),
          );
          if (!filePath.startsWith(resolvedDir)) return next();
          if (fs.existsSync(filePath) && fs.statSync(filePath).isFile()) {
            res.setHeader("Cache-Control", "no-cache");
            fs.createReadStream(filePath).pipe(res);
          } else {
            next();
          }
        });
      };
    },
  };
}

export default defineConfig(({ mode }) => {
  const env = loadEnv(mode, process.cwd(), "");
  const isProduction = mode === "production";
  const resourcesDir = getResourcesDir(__dirname);
  const proprietaryDir = getProprietaryDir(__dirname);
  const sourceDirs = [resourcesDir, proprietaryDir];
  const assetManifest: AssetManifest = isProduction
    ? buildPublicAssetManifest(sourceDirs)
    : {};
  const htmlAssetData = {
    assetManifest: JSON.stringify(assetManifest),
    gameEnv: JSON.stringify(env.GAME_ENV ?? "dev"),
    manifestHref: buildAssetUrl("manifest.json", assetManifest),
    faviconHref: buildAssetUrl("images/Favicon.svg", assetManifest),
    gameplayScreenshotUrl: buildAssetUrl(
      "images/GameplayScreenshot.png",
      assetManifest,
    ),
    backgroundImageUrl: buildAssetUrl("images/background.webp", assetManifest),
    desktopLogoImageUrl: buildAssetUrl("images/OpenFront.png", assetManifest),
    mobileLogoImageUrl: buildAssetUrl("images/OF.png", assetManifest),
  };

  const syncHashedPublicAssets = () => ({
    name: "sync-hashed-public-assets",
    apply: "build" as const,
    closeBundle() {
      const outDir = path.join(__dirname, "static");
      copyRootPublicFiles(resourcesDir, outDir);
      createHashedPublicAssetFiles(sourceDirs, outDir, assetManifest);
      writePublicAssetManifestModule(outDir, assetManifest);
    },
  });

  // In dev, redirect visits to /w*/game/* to "/" so Vite serves the index.html.
  const devGameHtmlBypass = (req?: {
    url?: string;
    method?: string;
    headers?: { accept?: string | string[] };
  }) => {
    if (req?.method !== "GET") return undefined;
    const accept = req.headers?.accept;
    const acceptValue = Array.isArray(accept)
      ? accept.join(",")
      : (accept ?? "");
    if (!acceptValue.includes("text/html")) return undefined;
    if (!req.url) return undefined;
    if (/^\/w\d+\/game\/[^/]+/.test(req.url)) {
      return "/";
    }
    return undefined;
  };

  return {
    test: {
      globals: true,
      environment: "jsdom",
      setupFiles: "./tests/setup.ts",
    },
    root: "./",
    base: "/",
    publicDir: isProduction ? false : "resources",

    resolve: {
      alias: {
        "protobufjs/minimal": path.resolve(
          __dirname,
          "node_modules/protobufjs/minimal.js",
        ),
        resources: path.resolve(__dirname, "resources"),
      },
    },

    plugins: [
      tsconfigPaths(),
      ...(!isProduction ? [serveProprietaryDir(proprietaryDir)] : []),
      ...(isProduction
        ? []
        : [
            createHtmlPlugin({
              minify: false,
              entry: "/src/client/Main.ts",
              template: "index.html",
              inject: {
                data: {
                  gitCommit: JSON.stringify("DEV"),
                  ...htmlAssetData,
                },
              },
            }),
          ]),
      ...(isProduction ? [syncHashedPublicAssets()] : []),
      tailwindcss(),
    ],

    define: {
      __ASSET_MANIFEST__: JSON.stringify(assetManifest),
      "process.env.WEBSOCKET_URL": JSON.stringify(
        isProduction ? "" : "localhost:3000",
      ),
      "process.env.GAME_ENV": JSON.stringify(isProduction ? "prod" : "dev"),
      "process.env.STRIPE_PUBLISHABLE_KEY": JSON.stringify(
        env.STRIPE_PUBLISHABLE_KEY,
      ),
      "process.env.API_DOMAIN": JSON.stringify(env.API_DOMAIN),
      // Add other process.env variables if needed, OR migrate code to import.meta.env
    },

    build: {
      outDir: "static", // Webpack outputs to 'static', assuming we want to keep this.
      emptyOutDir: true,
      assetsDir: "assets", // Sub-directory for assets
      rollupOptions: {
        output: {
          manualChunks: {
            vendor: ["pixi.js", "howler", "zod", "protobufjs"],
          },
        },
      },
    },

    server: {
      port: 9000,
      // Automatically open the browser when the server starts
      open: process.env.SKIP_BROWSER_OPEN !== "true",
      proxy: {
        "/lobbies": {
          target: "ws://localhost:3000",
          ws: true,
          changeOrigin: true,
        },
        // Worker proxies
        "/w0": {
          target: "ws://localhost:3001",
          ws: true,
          secure: false,
          changeOrigin: true,
          bypass: (req) => devGameHtmlBypass(req),
          rewrite: (path) => path.replace(/^\/w0/, ""),
        },
        "/w1": {
          target: "ws://localhost:3002",
          ws: true,
          secure: false,
          changeOrigin: true,
          bypass: (req) => devGameHtmlBypass(req),
          rewrite: (path) => path.replace(/^\/w1/, ""),
        },
        // API proxies
        "/api": {
          target: "http://localhost:3000",
          changeOrigin: true,
          secure: false,
        },
      },
    },
  };
});