const bleno = require('bleno')
const config = require('./config.json')
const localEvent = require('./localEvent')

var tmp = []
var idx = 0

const notifyDesciptor = new bleno.Descriptor({
  uuid: '8888',
  value: 0
})

class DataCharacteristic extends bleno.Characteristic {
  constructor() {
    super({
      uuid: config.uuid.service.func.data,
      properties: ['write', 'writeWithoutResponse', 'notify'],
      descriptors: [
        notifyDesciptor
      ]
    })
    this._notifyFunc = null
  }

  onWriteRequest(data, offset, withoutResponse, callback) {
    console.log(`offset :: ${offset} , withoutRes :: ${withoutResponse}`)
    console.log(`get data`, data)

    if (data.length == 1 && data[0] == 0x00) {
      tmp = []
      idx = 0
    } else if (data.length == 1 && data[0] == 0xff) {
      console.log(Buffer.from(tmp).toString())
      localEvent.emit('print', Buffer.from(tmp).toString())
    } else {
      tmp = [...tmp, ...data.slice(2, data.length)]
    }
    if (!withoutResponse) {
      console.log('send response')
      callback(this.RESULT_SUCCESS)
    }
  }

  sendNotidy(str) {
    if (!this._notifyFunc) return
    this._notifyFunc(Buffer.from(str))
  }

  onSubscribe(maxValueSize, cb) {
    console.log(maxValueSize)
    this._notifyFunc = cb
  }

  onUnsubscribe() {
    this._notifyFunc = null
  }
}

module.exports = DataCharacteristic