import platform from '@/platform'

const pkg = require('../../../../package.json')

export function getFrontendVersion() {
  return String((pkg && pkg.version) || '0.0.0').replace(/^v/i, '')
}

export function formatAppVersionLine(front, back) {
  const f = String(front || '').replace(/^v/i, '') || '—'
  const b = String(back || '').replace(/^v/i, '').trim() || '—'
  return `DiscWorker V${f} 基于DiscProducer 核心V${b}`
}

export function loadBackendVersion() {
  if (!(platform.hasNativeFs && platform.hasNativeFs())) {
    return Promise.resolve('')
  }
  const root = platform.getAppRoot()
  const candidates = [
    platform.pathJoin(root, 'CardsoonServer', 'VERSION'),
    platform.pathJoin(root, 'cardsoonServer', 'VERSION')
  ]
  const tryRead = (i) => {
    if (i >= candidates.length) return Promise.resolve('')
    return platform.readFile(candidates[i], 'utf8')
      .then((text) => String(text || '').trim().split(/\r?\n/)[0] || '')
      .catch(() => tryRead(i + 1))
  }
  return tryRead(0)
}

export function loadAppVersionLine() {
  const front = getFrontendVersion()
  return loadBackendVersion().then((back) => formatAppVersionLine(front, back))
}