import { spawn } from 'child_process';
import { join, dirname } from 'path';
import { fileURLToPath } from 'url';

const __dirname = dirname(fileURLToPath(import.meta.url));

// Path to sitespeed.io — works both locally and in Docker
const SITESPEED_BIN = process.env.SITESPEED_BIN ||
  join(__dirname, '..', 'sitespeed.io', 'bin', 'sitespeed.js');

export function runTest(job, onLine) {
  return new Promise((resolve, reject) => {
    const outputFolder = join(__dirname, 'reports', job.id);

    const args = [
      SITESPEED_BIN,
      job.url,
      '--browser', job.browser,
      '-n', String(job.runs),
      '--outputFolder', outputFolder,
      '--json',
      '--sustainable.enable',
      '--axe.enable',
      '--coach',
    ];

    if (job.mobile) {
      args.push('--mobile');
    }

    // Chrome needs these flags when running inside Docker
    if (process.env.IN_DOCKER) {
      args.push('--browsertime.chrome.args', 'no-sandbox');
      args.push('--browsertime.chrome.args', 'disable-dev-shm-usage');
      // Disable GPU compositing — not needed in Xvfb and can cause crashes
      args.push('--browsertime.chrome.args', 'disable-gpu');
    }

    onLine(`[runner] Starting: node ${args.slice(0, 3).join(' ')} ...`);
    onLine(`[runner] Output folder: ${outputFolder}`);

    const child = spawn('node', args, {
      cwd: __dirname,
      env: { ...process.env, DISPLAY: process.env.DISPLAY || ':99' },
    });

    child.stdout.on('data', (data) => {
      const lines = data.toString().split('\n').filter(Boolean);
      for (const line of lines) onLine(line);
    });

    child.stderr.on('data', (data) => {
      const lines = data.toString().split('\n').filter(Boolean);
      for (const line of lines) onLine(`[stderr] ${line}`);
    });

    child.on('close', (code) => {
      if (code === 0) {
        resolve(outputFolder);
      } else {
        reject(new Error(`sitespeed.io exited with code ${code}`));
      }
    });

    child.on('error', (err) => {
      reject(new Error(`Failed to spawn sitespeed.io: ${err.message}`));
    });
  });
}