import { createReadStream, existsSync } from 'node:fs'
import { writeFile } from 'node:fs/promises'
import { createServer } from 'node:http'
import { extname, normalize, resolve } from 'node:path'
import { firefox, webkit } from '../cnc_wams_gpt6/linuxcnc-master/web/node_modules/playwright/index.mjs'

const root = resolve(import.meta.dirname, '..')
const dist = resolve(root, 'dist')
const reportPath = resolve(root, 'config/browser-matrix-verification.json')
if (!existsSync(resolve(dist, 'index.html'))) throw new Error('Browser matrix requires a production build in dist/. Run npm run build first.')

const contentTypes = {
  '.css': 'text/css; charset=utf-8',
  '.html': 'text/html; charset=utf-8',
  '.js': 'text/javascript; charset=utf-8',
  '.json': 'application/json; charset=utf-8',
  '.wasm': 'application/wasm',
}
const server = createServer((request, response) => {
  response.setHeader('Cross-Origin-Opener-Policy', 'same-origin')
  response.setHeader('Cross-Origin-Embedder-Policy', 'require-corp')
  response.setHeader('Cross-Origin-Resource-Policy', 'same-origin')
  const requestPath = decodeURIComponent((request.url || '/').split('?')[0])
  const candidate = requestPath === '/' ? resolve(dist, 'index.html') : normalize(resolve(dist, `.${requestPath}`))
  const file = candidate.startsWith(dist) && existsSync(candidate) ? candidate : resolve(dist, 'index.html')
  response.setHeader('Content-Type', contentTypes[extname(file)] || 'application/octet-stream')
  createReadStream(file).on('error', (error) => { response.writeHead(500); response.end(String(error)) }).pipe(response)
})

await new Promise((resolveServer, rejectServer) => {
  server.once('error', rejectServer)
  server.listen(0, '127.0.0.1', resolveServer)
})
const baseUrl = `http://127.0.0.1:${server.address().port}`
const requested = process.argv.find((argument) => argument.startsWith('--browser='))?.slice('--browser='.length)
const engines = requested ? requested.split(',') : ['firefox', 'webkit']
const browserTypes = { firefox, webkit }
const executablePaths = { firefox: process.env.FIREFOX_BIN, webkit: process.env.WEBKIT_BIN }
const results = []

try {
  for (const engine of engines) {
    const browserType = browserTypes[engine]
    if (!browserType) throw new Error(`Unsupported browser matrix engine: ${engine}`)
    const browser = await browserType.launch({ headless: true, ...(executablePaths[engine] ? { executablePath: executablePaths[engine] } : {}) })
    const page = await browser.newPage({ viewport: { width: 1280, height: 900 } })
    const pageErrors = []
    page.on('pageerror', (error) => pageErrors.push(error.message))
    try {
      await page.goto(`${baseUrl}/workspace/pump-housing`, { waitUntil: 'domcontentloaded', timeout: 60_000 })
      await page.waitForSelector('.app-shell', { timeout: 30_000 })
      await page.waitForFunction(() => document.querySelector('.three-viewport-host canvas')?.dataset.geometrySource === 'bitbybit-occt', undefined, { timeout: 120_000 })
      const state = await page.evaluate(async () => {
        const canvas = document.querySelector('.three-viewport-host canvas')
        let opfs = false
        try { opfs = Boolean(await navigator.storage?.getDirectory?.()) } catch { opfs = false }
        return {
          userAgent: navigator.userAgent,
          crossOriginIsolated,
          sharedArrayBuffer: typeof SharedArrayBuffer === 'function',
          opfs,
          persistence: opfs ? 'opfs' : 'memory-fallback',
          shell: Boolean(document.querySelector('.app-shell')),
          workspace: Boolean(document.querySelector('.workspace-page')),
          workbench: document.querySelector('select[aria-label="Workbench"]')?.value || '',
          canvas: {
            width: canvas?.width || 0,
            height: canvas?.height || 0,
            geometrySource: canvas?.dataset.geometrySource || '',
          },
        }
      })
      const screenshot = await page.screenshot({ type: 'png' })
      const persistencePass = engine === 'firefox' ? state.opfs && state.persistence === 'opfs' : ['opfs', 'memory-fallback'].includes(state.persistence)
      const pass = pageErrors.length === 0 && state.shell && state.workspace && state.crossOriginIsolated && state.sharedArrayBuffer && persistencePass && state.workbench === 'Part Design' && state.canvas.width >= 100 && state.canvas.height >= 100 && state.canvas.geometrySource === 'bitbybit-occt' && screenshot.byteLength > 10_000
      results.push({ engine, status: pass ? 'pass' : 'fail', ...state, screenshotBytes: screenshot.byteLength, pageErrors })
    } catch (error) {
      results.push({ engine, status: 'fail', pageErrors: [...pageErrors, error instanceof Error ? error.message : String(error)] })
    } finally {
      await browser.close()
    }
  }
} finally {
  await new Promise((resolveClose) => server.close(resolveClose))
}

const report = { schemaVersion: 1, generatedAt: new Date().toISOString(), status: results.every((entry) => entry.status === 'pass') ? 'pass' : 'fail', browsers: results }
await writeFile(reportPath, `${JSON.stringify(report, null, 2)}\n`)
console.log(JSON.stringify(report, null, 2))
if (report.status !== 'pass') throw new Error('Non-Chrome browser matrix failed.')