// Playwright configuration for the end-to-end tests. Run through scripts/e2e.sh, which builds and serves a copy of the
// repository whose <track>/src holds the solutions and passes its address in E2E_BASE_URL.
//
// Browsers: Chromium and WebKit, and Firefox if a build is installed. Nothing is ever downloaded. If the exact build
// this Playwright version expects is missing but another revision of the same browser is in the Playwright cache
// (~/.cache/ms-playwright, or PLAYWRIGHT_BROWSERS_PATH), that one is used and named; if there is none, the project is
// left out with a message.
import { defineConfig, chromium, webkit, firefox } from '@playwright/test'
import { existsSync, readdirSync } from 'node:fs'
import { homedir } from 'node:os'
import { join } from 'node:path'

const cache = process.env.PLAYWRIGHT_BROWSERS_PATH || join(homedir(), '.cache', 'ms-playwright')
const launchers = {
  chromium: ['chrome-linux64/chrome', 'chrome-linux/chrome'],
  webkit: ['pw_run.sh'],
  firefox: ['firefox/firefox'],
}
// Print the notes once, from the main process, not again from every worker.
const say = (msg) => { if (!process.env.TEST_WORKER_INDEX) console.log(msg) }

const browser = (name, type) => {
  if (existsSync(type.executablePath())) return { name, use: { browserName: name } }
  const other = existsSync(cache)
    ? readdirSync(cache)
      .filter((d) => new RegExp(`^${name}-\\d+$`).test(d))
      .sort((a, b) => Number(b.split('-')[1]) - Number(a.split('-')[1]))
      .flatMap((d) => launchers[name].map((l) => join(cache, d, l)))
      .find(existsSync)
    : undefined
  if (other) {
    say(`e2e: ${name}: the expected build is not installed; using ${other}`)
    return { name, use: { browserName: name, launchOptions: { executablePath: other } } }
  }
  say(`e2e: ${name}: no build installed, skipping this project (npx playwright install ${name} would download one)`)
  return null
}

export default defineConfig({
  testDir: 'tests',
  fullyParallel: true,
  workers: process.env.E2E_WORKERS ? Number(process.env.E2E_WORKERS) : '50%',
  forbidOnly: true,
  retries: 0,
  timeout: 60_000,
  reporter: [['list'], ['html', { open: 'never', outputFolder: 'playwright-report' }]],
  outputDir: 'test-results',
  use: {
    baseURL: process.env.E2E_BASE_URL ?? 'http://127.0.0.1:8000',
    viewport: { width: 1280, height: 900 },
    trace: 'retain-on-failure',
  },
  projects: [browser('chromium', chromium), browser('webkit', webkit), browser('firefox', firefox)].filter(Boolean),
})