const fs = require('fs')
const path = require('path')

const vendorPath = path.join(__dirname, '..', 'unpackage', 'dist', 'dev', 'mp-weixin', 'common', 'vendor.js')

function patchMpWeixinVendor() {
  if (!fs.existsSync(vendorPath)) {
    return { ok: false, patched: false, reason: 'vendor.js not found' }
  }

  const s = fs.readFileSync(vendorPath, 'utf8')
  const from = 'this.$vm.$mp.query = query; // 兼容 mpvue'
  const toLegacy = 'if (this.$vm) {\\n      if (!this.$vm.$mp) this.$vm.$mp = {};\\n      this.$vm.$mp.query = query;\\n    }'
  const to = 'if (this.$vm) { if (!this.$vm.$mp) this.$vm.$mp = {}; this.$vm.$mp.query = query; }'

  if (s.includes(to)) {
    return { ok: true, patched: false, reason: 'already patched' }
  }
  if (s.includes(toLegacy)) {
    fs.writeFileSync(vendorPath, s.replace(toLegacy, to), 'utf8')
    return { ok: true, patched: true }
  }
  if (!s.includes(from)) {
    return { ok: false, patched: false, reason: 'target snippet not found' }
  }

  fs.writeFileSync(vendorPath, s.replace(from, to), 'utf8')
  return { ok: true, patched: true }
}

module.exports = patchMpWeixinVendor

if (require.main === module) {
  patchMpWeixinVendor()
}