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// This script builds ef.js document website and serve it.

import { serve, type Server, file } from "bun";
import chalk from "chalk";

import "./build";

const serveDir = new URL("../../website/dist/", import.meta.url);

function convertReqPathToFsPath(path: string): string {
  const rel = path.replace(/^\//, "");

  if (!rel || /\/$/.test(rel)) {
    return rel + "index.html";
  }

  return rel;
}

function startServer() {
  const server = serve({
    async fetch(req) {
      if (req.method !== "GET") {
        return new Response(null, { status: 405 });
      }

      const url = new URL(req.url);

      const path = new URL(convertReqPathToFsPath(url.pathname), serveDir);
      if (path.pathname.indexOf(serveDir.pathname) !== 0) {
        return new Response(null, { status: 403 });
      }

      const f = file(path);

      if (!(await f.exists())) {
        return new Response(file(new URL("404.html", serveDir)), {
          status: 404,
        });
      }

      return new Response(f);
    },
    port: process.env.PORT || 3000,
    hostname: process.env.HOST || undefined,
  });

  const displayUrl = new URL("http://example.com");
  displayUrl.port = server.port.toString(10);
  displayUrl.hostname = server.hostname;

  console.error(
    chalk.white(`Started a web server at %s`),
    chalk.blue(displayUrl.href),
  );

  return server;
}

declare global {
  var server: Server;
}

globalThis.server ??= startServer();