import test from 'node:test';
import assert from 'node:assert/strict';
import fs from 'node:fs';
import path from 'node:path';
import net from 'node:net';
import { EventEmitter } from 'node:events';
import { waitForUnixSocketReady } from './mpv';
import * as mpvModule from './mpv';

function createTempSocketPath(): { dir: string; socketPath: string } {
  const baseDir = path.join(process.cwd(), '.tmp', 'launcher-mpv-tests');
  fs.mkdirSync(baseDir, { recursive: true });
  const dir = fs.mkdtempSync(path.join(baseDir, 'case-'));
  return { dir, socketPath: path.join(dir, 'mpv.sock') };
}

test('mpv module exposes only canonical socket readiness helper', () => {
  assert.equal('waitForSocket' in mpvModule, false);
});

test('waitForUnixSocketReady returns false when socket never appears', async () => {
  const { dir, socketPath } = createTempSocketPath();
  try {
    const ready = await waitForUnixSocketReady(socketPath, 120);
    assert.equal(ready, false);
  } finally {
    fs.rmSync(dir, { recursive: true, force: true });
  }
});

test('waitForUnixSocketReady returns false when path exists but is not socket', async () => {
  const { dir, socketPath } = createTempSocketPath();
  try {
    fs.writeFileSync(socketPath, 'not-a-socket');
    const ready = await waitForUnixSocketReady(socketPath, 200);
    assert.equal(ready, false);
  } finally {
    fs.rmSync(dir, { recursive: true, force: true });
  }
});

test('waitForUnixSocketReady returns true when socket becomes connectable before timeout', async () => {
  const { dir, socketPath } = createTempSocketPath();
  fs.writeFileSync(socketPath, '');
  const originalCreateConnection = net.createConnection;
  try {
    net.createConnection = (() => {
      const socket = new EventEmitter() as net.Socket;
      socket.destroy = (() => socket) as net.Socket['destroy'];
      socket.setTimeout = (() => socket) as net.Socket['setTimeout'];
      setTimeout(() => socket.emit('connect'), 25);
      return socket;
    }) as typeof net.createConnection;

    const ready = await waitForUnixSocketReady(socketPath, 400);
    assert.equal(ready, true);
  } finally {
    net.createConnection = originalCreateConnection;
    fs.rmSync(dir, { recursive: true, force: true });
  }
});