const ArtcDataUtil = require("./ArtcDataUtil.js")
const FUNCTION = "function"
const SERVICE_UUID = "0000FF17-0000-1000-8000-00805F9B34FB"
const WRITE_UUID = "0000FF02-0000-1000-8000-00805F9B34FB"
const READ_UUID = "0000FF03-0000-1000-8000-00805F9B34FB"

var DevResult = function (code, data, msg) {
  this.code = code,
  this.data = data,
  this.msg = msg
}

var _bleDeviceId
var _connectCallback
var _connectCallback_0

/**
 * 连接设备
 */
var connectDevice = function (device, callback, callback_0) {
  _bleDeviceId = device.deviceId
  _connectCallback = callback
  _connectCallback_0 = callback_0
  //监听低功耗蓝牙连接状态的改变事件。包括开发者主动连接或断开连接，设备丢失连接异常断开等等
  wx.onBLEConnectionStateChange((res) => {
    if (res.deviceId == _bleDeviceId) {
      if (res.connected == true) {
        deployBle()
      } else {
        // console.log("连接断开")
        typeof _connectCallback_0 == FUNCTION && _connectCallback_0(new DevResult(1, null, "连接断开"))
      }
    }
  })
  //连接低功耗蓝牙设备。
  wx.createBLEConnection({
    deviceId: _bleDeviceId,
    timeout: 20 * 1000,
    success: (res) => {
    },
    fail: () => {
      typeof _connectCallback == FUNCTION && _connectCallback(new DevResult(1001, null, "连接失败"))
    },
  })
}

/**
 * 配置连接外设
 */
var deployBle = function () {
	//获取蓝牙设备所有服务(service)。
  wx.getBLEDeviceServices({
    deviceId: _bleDeviceId,
    success: (res) => {
      for (let i = 0; i < res.services.length; i ++) {
        if ((res.services[i].uuid + "") == SERVICE_UUID) {
			//获取蓝牙设备某个服务中所有特征值(characteristic)。
          wx.getBLEDeviceCharacteristics({
            deviceId: _bleDeviceId,
            serviceId: SERVICE_UUID,
            success: (res) => {
              let haveRead = false;
              let haveWrite = false;
              for (let j = 0; j < res.characteristics.length; j ++) {
                let chr = res.characteristics[j].uuid + ""
                if (chr == READ_UUID) {
                  haveRead = true;
                }
                else if (chr == WRITE_UUID) {
                  haveWrite = true;
                }
              }
              if (haveRead == true && haveWrite == true) {
				  //启用低功耗蓝牙设备特征值变化时的 notify 功能，订阅特征值。
                wx.notifyBLECharacteristicValueChange({
                  deviceId: _bleDeviceId,
                  serviceId: SERVICE_UUID,
                  characteristicId: READ_UUID,
                  state: true,
                  success: (res) => {
                    initDevice()
                  },
                  fail: () => {
                    disconnectDevice()
                    typeof _connectCallback == FUNCTION && _connectCallback(new DevResult(1002, null, "监听数据失败"))
                  }
                })
              }else {
                disconnectDevice()
                typeof _connectCallback == FUNCTION && _connectCallback(new DevResult(1003, null, "必须特征不满足"))
              }
            },
            fail: () => {
              disconnectDevice()
              typeof _connectCallback == FUNCTION && _connectCallback(new DevResult(1004, null, "读取特征失败"))
            }
          })
          return
        }
      }
      disconnectDevice()
      typeof _connectCallback == FUNCTION && _connectCallback(new DevResult(1005, null, "必须服务不满足"))
    },
    fail: () => {
      disconnectDevice()
      typeof _connectCallback == FUNCTION && _connectCallback(new DevResult(1006, null, "读取服务失败"))
    }
  })
  //监听低功耗蓝牙设备的特征值变化事件。必须先启用 notifyBLECharacteristicValueChange 接口才能接收到设备推送的 notification。
  wx.onBLECharacteristicValueChange((res) =>{
    if (res.deviceId == _bleDeviceId && res.serviceId == SERVICE_UUID && res.characteristicId == READ_UUID) {
      let hexData = ArtcDataUtil.buf2hex(res.value)
      // console.log("接收：" + hexData)
      analyticData(hexData)
    }
  })
}


/**
 * 断开蓝牙连接
 */
var disconnectDevice = function (callback) {
  wx.closeBLEConnection({
    deviceId: _bleDeviceId,
    success: (res) => {
      typeof callback == FUNCTION && callback(new DevResult(0, null, "连接断开成功"))
    },
    fail: () => {
      typeof callback == FUNCTION && callback(new DevResult(1101, null, "连接断开失败"))
    }
  })
}


var _sendCallback
var _sendDatas
var _sendIndex = 0
/**
 * 发送数据
 */
var sendData = function (datas, callback) {
  _pakectData = ""
  _packetLength = 0
  _pakectArray = new Array()
  _pakectCount = 0
  _sendCallback = callback
  _sendDatas = datas
  _sendIndex = 0
  doSendData()
}

var doSendData = function () {
  if (_sendIndex < _sendDatas.length) {
    let value = _sendDatas[_sendIndex]
    wx.writeBLECharacteristicValue({
      deviceId: _bleDeviceId,
      serviceId: SERVICE_UUID,
      characteristicId: WRITE_UUID,
      value: value,
      success: (res) => {
        // console.log("发送：" + ArtcDataUtil.buf2hex(value))
        setTimeout(() => {
          _sendIndex++
          doSendData()
        }, 5)
      },
      fail: () => {
        typeof _sendCallback == FUNCTION && _sendCallback(new DevResult(1201, null, "发送数据失败"))
      }
    })
  }
}


var _pakectData = ""
var _packetLength = 0
var _pakectArray = new Array()
var _pakectCount = 0
/**
 * 解析数据
 */
var analyticData = function (data) {
  if (_pakectData.length == 0) {
    if (data.startsWith("50") && data.length >= 8) {
      _packetLength = parseInt(data.slice(6, 8), 16) * 2 + 10
    } else {
      typeof _sendCallback == FUNCTION && _sendCallback(new DevResult(1202, null, "接收数据异常，LEN字段缺失"))
      return
    }
  }
  _pakectData += data
  if (_pakectData.length < _packetLength) {
    return
  }
  if (_pakectData.length > _packetLength) {
    _pakectData = ""
    _packetLength = 0
    typeof _sendCallback == FUNCTION && _sendCallback(new DevResult(1203, null, "接收数据异常，接收数据超长"))
    return
  }
  if (_pakectData.length == _packetLength) {
    if (_pakectArray.length == 0) {
      let ctl = parseInt(_pakectData.slice(2, 6), 16)
      _pakectCount = ctl - 0x8000
      if (_pakectCount <= 0) {
        _pakectData = ""
        _packetLength = 0
        typeof _sendCallback == FUNCTION && _sendCallback(new DevResult(1204, null, "接收数据异常，CTL字段数据异常"))
        return
      }
    }
    _pakectArray.push(_pakectData)
    _pakectData = ""
    _packetLength = 0

    if (_pakectArray.length == _pakectCount) {
      for (let i = 0; i < _pakectArray.length; i++) {
        let bcc = 0
        for (let j = 0; j < _pakectArray[i].length - 2; j += 2) {
          let bit = parseInt(_pakectArray[i].slice(j, j + 2), 16)
          bcc ^= bit
        }
        if (bcc != parseInt(_pakectArray[i].slice(-2), 16)) {
          typeof _sendCallback == FUNCTION && _sendCallback(new DevResult(1205, null, "接收数据异常，BCC校验失败"))
          _pakectArray = new Array()
          _packetLength = 0
          return
        }
      }
      let completeData = ""
      for (let i = 0; i < _pakectArray.length; i++) {
        if (_pakectArray[i].length >= 10) {
          completeData += _pakectArray[i].slice(8, -2)
        }
      }
      _pakectArray = new Array()
      _packetLength = 0
      typeof _sendCallback == FUNCTION && _sendCallback(new DevResult(0, completeData, "指令发送成功，接收结果成功"))
    }
  }
}

var initDevice = function() {
  sendData(ArtcDataUtil.make80SendData(), (res) => {
    if (res.code == 0) {
      let data = res.data
      if (data.startsWith("9000")) {
        typeof _connectCallback == FUNCTION && _connectCallback(new DevResult(0, null, "连接成功，初始化设备成功"))
        typeof _connectCallback_0 == FUNCTION && _connectCallback_0(new DevResult(0, null, "连接成功，初始化设备成功"))
      } else {
        disconnectDevice()
        typeof _connectCallback == FUNCTION && _connectCallback(new DevResult(1008, null, "连接成功，初始化设备失败"))
      }
    } else {
      disconnectDevice()
      typeof _connectCallback == FUNCTION && _connectCallback(new DevResult(1007, null, "连接成功，初始化设备失败"))
    }
  })
}


var transCmd = function(cmd, cmdtype, callback) {
  let tlv = ArtcDataUtil.makeTLV(cmd)
  sendData(ArtcDataUtil.make82SendData(cmdtype, tlv), (res) => {
    if (res.code == 0) {
      let data = res.data
      if (data.length >= 12) {
        let tlv = data.slice(10)
        let reapdus = ArtcDataUtil.reTLV(tlv)
        typeof callback == FUNCTION && callback(new DevResult(0, reapdus, "透传成功"))
      }else {
        typeof callback == FUNCTION && callback(new DevResult(1206, null, "缺失tlv数据"))
      }
    }else {
      typeof callback == FUNCTION && callback(res)
    }
  })
}




//接口对象
var ArtcBleUtil = {
  connectDevice: connectDevice,
  disconnectDevice: disconnectDevice,
  transCmd: transCmd,
}


//暴露接口对象
module.exports = ArtcBleUtil