const port = Number(process.env.WEB_PORT || 3000);
const apiOrigin = process.env.API_ORIGIN || "http://localhost:3001";

function staticResponse(path: string) {
  const file = Bun.file(`dist${path}`);
  return file.exists().then(exists => exists
    ? new Response(file, { headers: { "Cache-Control": path === "/sw.js" || path === "/index.html" ? "no-cache" : "public, max-age=3600" } })
    : null);
}

Bun.serve({
  port,
  hostname: process.env.WEB_HOST || "127.0.0.1",
  async fetch(request) {
    const url = new URL(request.url);
    if (url.pathname.startsWith("/api/") || url.pathname.startsWith("/auth/")) {
      const upstream = new URL(url.pathname + url.search, apiOrigin);
      const headers = new Headers(request.headers);
      headers.delete("host");
      headers.set("X-Forwarded-Host", url.host);
      headers.set("X-Forwarded-Proto", url.protocol.slice(0, -1));
      return fetch(upstream, { method: request.method, headers, body: request.body, redirect: "manual" });
    }
    const path = decodeURIComponent(url.pathname);
    if (path.includes("..") || path.includes("\\")) return new Response("Not found", { status: 404 });
    const requested = path === "/" ? "/index.html" : path;
    const response = await staticResponse(requested);
    if (response) return response;
    if (!requested.includes(".")) return (await staticResponse("/index.html"))!;
    return new Response("Not found", { status: 404 });
  },
});
console.log(`Timelog web listening on ${port}`);