#!/usr/bin/env node

function parseVersion(value) {
  const match = /^v?(\d+)(?:\.(\d+))?(?:\.(\d+))?$/i.exec(String(value ?? '').trim())
  return match ? [Number(match[1]), Number(match[2] ?? 0), Number(match[3] ?? 0)] : null
}

function nextVersion(value) {
  const version = parseVersion(value)
  if (!version) throw new Error(`版本号格式无效: ${value}`)
  version[2] += 1
  return version.join('.')
}

if (process.argv.includes('--self-test')) {
  if (nextVersion('1.0.9') !== '1.0.10' || nextVersion('v2.3') !== '2.3.1') {
    throw new Error('wechat-next-version self-test failed')
  }
  console.log('wechat-next-version self-test passed')
} else {
  const current = process.argv[2]
  console.log(current ? nextVersion(current) : (process.env.WECHAT_VERSION_FALLBACK || '1.0.2'))
}