import fs from 'fs'
import path from 'path'
import { spawnSync } from 'child_process'
import { fileURLToPath } from 'url'

const __filename = fileURLToPath(import.meta.url)
const __dirname = path.dirname(__filename)

const electronRoot = path.resolve(__dirname, '..')
const backendRoot = path.resolve(electronRoot, '..')

const pythonCandidates = [
  path.join(backendRoot, 'python', 'python.exe'),
  path.join(backendRoot, 'python', 'Scripts', 'python.exe'),
]
const web2Py = path.join(backendRoot, 'web2.py')
const ffmpegCandidates = [
  path.join(backendRoot, 'ffmpeg', 'ffmpeg.exe'),
  path.join(backendRoot, 'ffmpeg', 'bin', 'ffmpeg.exe'),
  path.join(backendRoot, 'tools', 'ffmpeg', 'ffmpeg.exe'),
  path.join(backendRoot, 'tools', 'ffmpeg', 'bin', 'ffmpeg.exe'),
]

const errors = []

if (!fs.existsSync(web2Py)) {
  errors.push(`缺少后端入口文件: ${web2Py}`)
}
const pythonExe = pythonCandidates.find((p) => fs.existsSync(p)) ?? null
if (!pythonExe) {
  errors.push(`缺少内置 Python（任一路径即可）：\n- ${pythonCandidates[0]}\n- ${pythonCandidates[1]}`)
}
// venv 结构在跨机器分发时可能依赖构建机本地 Python，不可作为懒人包运行时。
if (fs.existsSync(path.join(backendRoot, 'python', 'pyvenv.cfg'))) {
  errors.push(
    `检测到 venv 运行时（${path.join(
      backendRoot,
      'python',
      'pyvenv.cfg',
    )}）。该结构不保证跨机器可用，请改为可分发的独立 Python Runtime（嵌入式/便携式）。`,
  )
}

const ffmpegExe = ffmpegCandidates.find((p) => fs.existsSync(p)) ?? null
if (!ffmpegExe) {
  errors.push(
    `缺少 ffmpeg.exe（以下任一路径都可）：\n${ffmpegCandidates.map((p) => `- ${p}`).join('\n')}`,
  )
}

if (pythonExe) {
  const check = spawnSync(
    pythonExe,
    [
      '-c',
      'import importlib.util,fastapi,uvicorn,requests,psutil,src; assert importlib.util.find_spec("web2"); print("runtime_ok")',
    ],
    {
      cwd: backendRoot,
      encoding: 'utf8',
      windowsHide: true,
      timeout: 30000,
    },
  )
  if (check.status !== 0) {
    errors.push(
      `内置 Python 缺少运行依赖或无法导入后端模块（fastapi/uvicorn/requests/psutil/web2/src）。\n请先在 ${path.join(
        backendRoot,
        'python',
      )} 环境安装 requirements.txt。\n\nstdout:\n${check.stdout || '(empty)'}\n\nstderr:\n${check.stderr || '(empty)'}`,
    )
  }
}

if (errors.length) {
  console.error('[verify:runtime] 运行时检查失败：\n')
  for (const e of errors) console.error(`- ${e}\n`)
  process.exit(1)
}

const st = spawnSync('node', [path.join(__dirname, 'stage-offline-runtime.mjs')], {
  cwd: electronRoot,
  stdio: 'inherit',
})
if (st.status !== 0) {
  console.error('[verify:runtime] 生成 offline-runtime 镜像失败')
  process.exit(1)
}

console.log('[verify:runtime] OK: 内置 Python/依赖/ffmpeg 已就绪，offline-runtime 已同步。')