const gose = require('./lib.js')
const goseJs = require('./js.js')
const cfg = require('./config.js')
const goseMI = require('./wxml.js')
const goseSs = require('./wxss.js')
const path = require('path')
const fs = require('fs')
function header (buf) {
  console.log('\nHeader info:')
  let firstMark = buf.readUInt8(0)
  console.log('  firstMark: 0x%s', firstMark.toString(16))
  let unknownInfo = buf.readUInt32BE(1)
  console.log('  unknownInfo: ', unknownInfo)
  let infoListLength = buf.readUInt32BE(5)
  console.log('  infoListLength: ', infoListLength)
  let dataLength = buf.readUInt32BE(9)
  console.log('  dataLength: ', dataLength)
  let lastMark = buf.readUInt8(13)
  console.log('  lastMark: 0x%s', lastMark.toString(16))
  if (firstMark != 0xbe || lastMark != 0xed)
    throw Error('Magic number is not correct!')
  return [infoListLength, dataLength]
}
function genList (buf) {
  console.log('\nFile list info:')
  let fileCount = buf.readUInt32BE(0)
  console.log('  fileCount: ', fileCount)
  let fileInfo = [],
    off = 4
  for (let i = 0; i < fileCount; i++) {
    let info = {}
    let nameLen = buf.readUInt32BE(off)
    off += 4
    info.name = buf.toString('utf8', off, off + nameLen)
    off += nameLen
    info.off = buf.readUInt32BE(off)
    off += 4
    info.size = buf.readUInt32BE(off)
    off += 4
    fileInfo.push(info)
    console.log(info)
  }
  return fileInfo
}
function saveFile (dir, buf, list) {
  console.log('Saving files...')
  for (let info of list)
    gose.save(
      path.resolve(dir, (info.name.startsWith('/') ? '.' : '') + info.name),
      buf.slice(info.off, info.off + info.size)
    )
}
function packDone (dir, cb, order) {
  console.log('Unpack done.')
  let weappEvent = new gose.CntEvent(),
    needDelete = {}
  weappEvent.encount(4)
  weappEvent.add(() => {
    gose.addIO(() => {
      console.log('Split and make up done.')
      if (!order.includes('d')) {
        console.log('Delete files...')
        gose.addIO(() => console.log('Deleted.\n\nFile done.'))
        for (let name in needDelete) if (needDelete[name] >= 8) gose.del(name)
      }
      cb()
    })
  })
  function doBack (deletable) {
    for (let key in deletable) {
      if (!needDelete[key]) needDelete[key] = 0
      needDelete[key] += deletable[key] //all file have score bigger than 8 will be delete.
    }
    weappEvent.decount()
  }
  //This will be the only func running this time, so async is needless.
  if (fs.existsSync(path.resolve(dir, 'app-service.js'))) {
    //weapp
    console.log(
      'Split app-service.js and make up configs & wxss & wxml & wxs...'
    )
    cfg.doConfig(path.resolve(dir, 'app-config.json'), doBack)
    goseJs.splitJs(path.resolve(dir, 'app-service.js'), doBack)
    if (fs.existsSync(path.resolve(dir, 'workers.js')))
      goseJs.splitJs(path.resolve(dir, 'workers.js'), doBack)
    if (fs.existsSync(path.resolve(dir, 'page-frame.html')))
      goseMI.doFrame(path.resolve(dir, 'page-frame.html'), doBack, order)
    else if (fs.existsSync(path.resolve(dir, 'app-wxss.js'))) {
      goseMI.doFrame(path.resolve(dir, 'app-wxss.js'), doBack, order)
      if (!needDelete[path.resolve(dir, 'page-frame.js')])
        needDelete[path.resolve(dir, 'page-frame.js')] = 8
    } else
      throw Error('page-frame-like file is not found in the package by auto.')
    goseSs.doWxss(dir, doBack) //Force it run at last, becuase lots of error occured in this part
  } else if (fs.existsSync(path.resolve(dir, 'game.js'))) {
    //wegame
    console.log('Split game.js and rewrite game.json...')
    let gameCfg = path.resolve(dir, 'app-config.json')
    gose.get(gameCfg, cfgPlain => {
      let cfg = JSON.parse(cfgPlain)
      if (cfg.subContext) {
        console.log('Found subContext, splitting it...')
        delete cfg.subContext
        let contextPath = path.resolve(dir, 'subContext.js')
        goseJs.splitJs(contextPath, () => gose.del(contextPath))
      }
      gose.save(path.resolve(dir, 'game.json'), JSON.stringify(cfg, null, 4))
      gose.del(gameCfg)
    })
    goseJs.splitJs(path.resolve(dir, 'game.js'), () => {
      gose.addIO(() => {
        console.log('Split and rewrite done.')
        cb()
      })
    })
  } else
    throw Error(
      'This package is unrecognizable.\nMay be this package is a subPackage which should be unpacked with -s=<MainDir>.\nOtherwise, please decrypted every type of file by hand.'
    )
}
function doFile (name, cb, order) {
  for (let ord of order) if (ord.startsWith('s=')) global.subPack = ord.slice(3)
  console.log('Unpack file ' + name + '...')
  let dir = path.resolve(name, '..', path.basename(name, '.wxapkg'))
  gose.get(
    name,
    buf => {
      let [infoListLength, dataLength] = header(buf.slice(0, 14))
      if (order.includes('o'))
        gose.addIO(console.log.bind(console), 'Unpack done.')
      else gose.addIO(packDone, dir, cb, order)
      saveFile(dir, buf, genList(buf.slice(14, infoListLength + 14)))
    },
    {}
  )
}
module.exports = { doFile: doFile }
if (require.main === module) {
  gose.commandExecute(
    doFile,
    'Unpack a wxapkg file.\n\n[-o] [-d] [-s=<Main Dir>] <files...>\n\n-d Do not delete transformed unpacked files.\n-o Do not execute any operation after unpack.\n-s=<Main Dir> Regard all packages provided as subPackages and\n              regard <Main Dir> as the directory of sources of the main package.\n<files...> wxapkg files to unpack'
  )
}