const fs = require('fs');
const path = require('path');
const { chromium } = require('playwright');

const BASE_URL = process.env.BASE_URL || 'http://127.0.0.1:8000/';
const ARTIFACTS = path.resolve(process.env.ARTIFACTS_DIR || path.join(__dirname, 'artifacts'));

fs.mkdirSync(ARTIFACTS, { recursive: true });

function assert(condition, message) {
  if (!condition) throw new Error(message);
}

function trackErrors(page) {
  const errors = [];
  page.on('console', (message) => {
    if (message.type() === 'error') errors.push(`console: ${message.text()}`);
  });
  page.on('pageerror', (error) => errors.push(`pageerror: ${error.message}`));
  page.on('response', (response) => {
    if (response.status() >= 400) errors.push(`http ${response.status()}: ${response.url()}`);
  });
  return errors;
}

async function launch(viewport = { width: 1440, height: 1000 }) {
  const browser = await chromium.launch({ headless: true });
  const page = await browser.newPage({ viewport, deviceScaleFactor: 1 });
  return { browser, page };
}

async function open(page) {
  await page.goto(BASE_URL, { waitUntil: 'networkidle' });
  await page.waitForTimeout(800);
}

async function screenshot(page, name) {
  await page.screenshot({ path: path.join(ARTIFACTS, name), fullPage: true });
}

async function run(name, fn) {
  const started = Date.now();
  try {
    await fn();
    console.log(`PASS ${name} (${Date.now() - started}ms)`);
  } catch (error) {
    console.error(`FAIL ${name}: ${error.stack || error.message}`);
    process.exitCode = 1;
  }
}

module.exports = {
  BASE_URL,
  ARTIFACTS,
  assert,
  trackErrors,
  launch,
  open,
  screenshot,
  run,
};