import assert from "node:assert/strict";
import { mkdtemp, rm, writeFile } from "node:fs/promises";
import { createServer } from "node:http";
import os from "node:os";
import path from "node:path";
import test from "node:test";

import { createCloudWebServer } from "./cloud-web-runtime.mjs";

test("cloud web auth requests are proxied once", async () => {
  let upstreamRequests = 0;
  const upstream = createServer((request, response) => {
    upstreamRequests += 1;
    request.resume();
    response.writeHead(200, { "content-type": "application/json" });
    response.end(JSON.stringify({ authenticated: true, path: request.url }));
  });
  await listen(upstream);

  const cloudWeb = createCloudWebServer({
    serviceId: "hwlab-cloud-web",
    cloudApiBaseUrl: serverUrl(upstream),
    cloudApiProxyTimeoutMs: 1000,
    healthPayload: () => ({ status: "ok" }),
    sendJson(response, statusCode, body) {
      const payload = JSON.stringify(body);
      response.writeHead(statusCode, {
        "content-type": "application/json",
        "content-length": Buffer.byteLength(payload)
      });
      response.end(payload);
    }
  });
  await listen(cloudWeb);

  try {
    const response = await fetch(`${serverUrl(cloudWeb)}/auth/session`, {
      headers: { cookie: "hwlab_session=token" }
    });
    assert.equal(response.status, 200);
    assert.deepEqual(await response.json(), { authenticated: true, path: "/auth/session" });
    assert.equal(upstreamRequests, 1);
  } finally {
    await close(cloudWeb);
    await close(upstream);
  }
});

test("cloud web serves access deep link through the React shell", async () => {
  const root = await mkdtemp(path.join(os.tmpdir(), "hwlab-cloud-web-runtime-"));
  await writeFile(path.join(root, "index.html"), "<div id=\"root\"></div>\n", "utf8");
  const cloudWeb = createCloudWebServer({
    serviceId: "hwlab-cloud-web",
    roots: [root],
    cloudApiBaseUrl: "http://127.0.0.1:1",
    healthPayload: () => ({ status: "ok" }),
    sendJson(response, statusCode, body) {
      const payload = JSON.stringify(body);
      response.writeHead(statusCode, {
        "content-type": "application/json",
        "content-length": Buffer.byteLength(payload)
      });
      response.end(payload);
    }
  });
  await listen(cloudWeb);

  try {
    const response = await fetch(`${serverUrl(cloudWeb)}/access`);
    assert.equal(response.status, 200);
    assert.equal(response.headers.get("content-type"), "text/html; charset=utf-8");
    assert.equal(await response.text(), "<div id=\"root\"></div>\n");
  } finally {
    await close(cloudWeb);
    await rm(root, { recursive: true, force: true });
  }
});

function listen(server) {
  return new Promise((resolve, reject) => {
    server.once("error", reject);
    server.listen(0, "127.0.0.1", resolve);
  });
}

function close(server) {
  return new Promise((resolve, reject) => {
    server.close((error) => (error ? reject(error) : resolve()));
  });
}

function serverUrl(server) {
  const address = server.address();
  return `http://127.0.0.1:${address.port}`;
}