import assert from "node:assert/strict";
import { spawn } from "node:child_process";
import net from "node:net";
import test from "node:test";

async function getFreePort() {
  const server = net.createServer();
  await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
  const address = server.address();
  if (!address || typeof address === "string") {
    throw new Error("Could not allocate test port");
  }
  await new Promise((resolve, reject) => server.close((error) => error ? reject(error) : resolve()));
  return address.port;
}

test("server shuts down cleanly after SIGTERM", async () => {
  const port = await getFreePort();
  const child = spawn(process.execPath, ["dist/server.js"], {
    cwd: process.cwd(),
    env: { ...process.env, PORT: String(port), SSH_KEYS_DIR: `/tmp/loc-via-git-keys-${port}`, TMP_DIR: `/tmp/loc-via-git-${port}` },
    stdio: ["ignore", "pipe", "pipe"]
  });
  let output = "";
  child.stdout.on("data", (chunk) => {
    output += chunk.toString();
  });

  try {
    await new Promise((resolve, reject) => {
      const timeout = setTimeout(() => reject(new Error(`Server did not start: ${output}`)), 2_000);
      const interval = setInterval(() => {
        if (output.includes("server_started")) {
          clearTimeout(timeout);
          clearInterval(interval);
          resolve();
        }
      }, 10);
    });
    child.kill("SIGTERM");
    const code = await new Promise((resolve) => child.once("exit", resolve));
    assert.equal(code, 0);
    assert.match(output, /shutdown_complete/);
  } finally {
    child.kill("SIGKILL");
  }
});