// Phase A end-to-end verification: drives the REAL compiled renderMp4Job
// (dist-electron/renderWorker.cjs) through ffmpeg and ffprobes the result.
//
// Run: npx tsc -p tsconfig.electron.json && node_modules/.bin/electron scripts/verify-export.cjs

const { app } = require('electron')
const path = require('node:path')
const os = require('node:os')
const fs = require('node:fs')
const { execFileSync } = require('node:child_process')
const { renderMp4Job } = require('../dist-electron/renderWorker.cjs')

const fps = 12
const duration = 2
const scene = {
  canvas: { width: 320, height: 240, background: '#202030' },
  duration,
  assets: [{ id: 'a1', kind: 'rect', width: 40, height: 40, fill: '#ff4040' }],
  layers: [
    {
      id: 'l1',
      assetId: 'a1',
      visible: true,
      base: { x: 20, y: 100, scaleX: 1, scaleY: 1, rotation: 0, opacity: 1 },
      keyframes: [
        { time: 0, props: { x: 20 } },
        { time: 2, props: { x: 260 } },
      ],
    },
  ],
}
const options = {
  fps,
  duration,
  totalFrames: fps * duration + 1,
  crf: '20',
  preset: 'ultrafast',
}

async function main() {
  const outPath = path.join(os.tmpdir(), 'ruwio-verify-export.mp4')
  fs.rmSync(outPath, { force: true })

  const controller = new AbortController()
  let lastProgress = 0
  const startedAt = Date.now()
  await renderMp4Job({
    jobId: 'verify',
    scene,
    options,
    outputPath: outPath,
    signal: controller.signal,
    onProgress: (p) => {
      lastProgress = p
    },
  })
  const elapsedMs = Date.now() - startedAt
  const msPerFrame = elapsedMs / options.totalFrames

  const notes = []
  let pass = true
  if (!fs.existsSync(outPath)) {
    pass = false
    notes.push('output file missing')
  } else {
    const sizeKb = (fs.statSync(outPath).size / 1024).toFixed(1)
    const probe = JSON.parse(
      execFileSync('ffprobe', [
        '-v', 'error',
        '-select_streams', 'v:0',
        '-show_entries', 'stream=codec_name,width,height,nb_read_frames',
        '-count_frames',
        '-of', 'json',
        outPath,
      ]).toString(),
    )
    const s = probe.streams[0]
    console.log(`output: ${outPath} (${sizeKb} KB)`)
    console.log(`codec=${s.codec_name} ${s.width}x${s.height} frames=${s.nb_read_frames} progress=${lastProgress}`)
    console.log(`elapsed=${elapsedMs}ms (${msPerFrame.toFixed(1)}ms/frame)`)
    if (s.codec_name !== 'h264') { pass = false; notes.push(`codec ${s.codec_name} != h264`) }
    if (s.width !== 320 || s.height !== 240) { pass = false; notes.push(`wrong dims ${s.width}x${s.height}`) }
    if (Number(s.nb_read_frames) !== options.totalFrames) {
      pass = false
      notes.push(`frames ${s.nb_read_frames} != expected ${options.totalFrames}`)
    }
    if (lastProgress !== 1) { pass = false; notes.push(`final progress ${lastProgress} != 1`) }
    const maxMsPerFrame = Number(process.env.RUWIO_VERIFY_MAX_MS_PER_FRAME || 800)
    if (msPerFrame > maxMsPerFrame) {
      pass = false
      notes.push(
        `render throughput ${msPerFrame.toFixed(1)}ms/frame exceeds ${maxMsPerFrame}ms/frame ` +
          '(hidden render window may be throttled)',
      )
    }

    // Decode first & last frame, confirm the rect moved (motion preserved).
    const f0 = path.join(os.tmpdir(), 'ruwio-f0.png')
    const f1 = path.join(os.tmpdir(), 'ruwio-flast.png')
    execFileSync('ffmpeg', ['-y', '-v', 'error', '-i', outPath, '-vf', 'select=eq(n\\,0)', '-frames:v', '1', f0])
    execFileSync('ffmpeg', ['-y', '-v', 'error', '-sseof', '-0.1', '-i', outPath, '-frames:v', '1', f1])
    const sz0 = fs.statSync(f0).size
    const sz1 = fs.statSync(f1).size
    const b0 = fs.readFileSync(f0)
    const b1 = fs.readFileSync(f1)
    const same = b0.length === b1.length && b0.equals(b1)
    console.log(`first frame ${sz0}B, last frame ${sz1}B, identical=${same}`)
    if (same) { pass = false; notes.push('first and last frame identical (no motion)') }
  }

  console.log(notes.length ? 'NOTES:\n  ' + notes.join('\n  ') : 'NOTES: none')
  console.log(pass ? 'RESULT: PASS' : 'RESULT: FAIL')
  app.exit(pass ? 0 : 1)
}

// renderMp4Job closes its render window; suppress the default auto-quit so it
// doesn't race result printing.
app.on('window-all-closed', () => {})

app.whenReady().then(() =>
  main().catch((err) => {
    console.error('HARNESS ERROR:', err)
    app.exit(2)
  }),
)