var responseData = {code : '',
                   status:'测量中...',
                     data:{}}

var save_point = 0
// 数据包
var packetArr = []


// function appendPacket(dataStr){
//   var dataArr = packetArr
//   // 拆分成数组
//   while (i < dataStr.length) {
    
//     dataArr.push(dataStr.substr(i, 2))
//     i += 2
//     if (dataArr[0] == '55' && dataArr.length >= 8 && dataArr[2] == '03') {
      
//     }
//   }
//   if (dataStr.substr(0,2) == '55'){
//     packetStr = dataStr
//     save_point = packetStr.length
//     if (save_point > 8) {
//       save_point = 0 
//       return true
//     }
//     return false
//   }
//   packetStr = packetStr + dataStr
//   return false
// }                     

function bioland_analysisPacket_bloodPressure(dataStr, callBack){

  // 第6位才能区分包类别 低于6位肯定不是正确数据
  if (dataStr.length > 6) {
    var dataArr = []
    var i = 0
    // 拆分成数组
    while (i < dataStr.length) {
      dataArr.push(dataStr.substr(i, 2))
      i += 2
    }
    // 固定码不对 证明不是正确数据
    if (dataArr[0] != '55') {
      responseData = {}
      return
    }
    //  信息包  过程  结果  错误  结束
    switch (dataArr[2]) {
      case '00':
        deviceInfo(dataArr)
        break
      case '02':
        measuring[dataArr]
        break
      case '03':
        // console.log('结果包', dataArr)
        measurementComplete(dataArr)
        break
      case 'ee':
        errorData(dataArr)
        console.log('错误包')
        break
      case '05':
        transmitComplete(dataArr)
        console.log('结束包')
        break
    }
    callBack(responseData)
  }
}

function deviceInfo(dataArr) {
  if(dataArr.length < 10) return
  responseData.code = '0'
  responseData.status = '成功获取到设备信息'
  if(dataArr[5] != '01'){
    responseData.code = 'e'
    responseData.status = '设备不匹配，请连接指定血压计'
  }
}

function errorData(dataArr) {
  hexToDecimal(dataArr)
  responseData.code = 'e'
  responseData.status = '测量出错'
  responseData.data.errorCode = dataArr[3]
}
// 获取到测量结果
function measurementComplete(dataArr) {
  responseData.code = '3'
  responseData.status = '测量完成'
  // 收缩压 数据的高字节加低字节
  // console.log('结果包', dataArr)
  responseData.systolic = parseInt(dataArr[10] + dataArr[9], 16)
  // 舒张压
  responseData.diastolic = parseInt(dataArr[11], 16)
  responseData.pulse = parseInt(dataArr[12], 16)
}
// 测量中
function measuring(dataArr) {
  responseData.code = '2'
  responseData.status = '测量中...'
  // 压力值
  // responseData.data.pressure = dataArr[5] + dataArr[6]
  // responseData.data.heartbeat = dataArr[3]
}
// 传输完成
function transmitComplete(dataArr) {
  responseData.code = '5'
  responseData.status = '测量完成'
}

function responseDataChange(){
  callBack(responseData)
}

// 把包类别之后的16进制数据转换为10进制数据
function hexToDecimal(dataArr) {
  dataArr.map(function (item,index) {
    if(index > 2){
      item = parseInt(item, 16)
    }
    return item
  })
}

function clearData(){

}

module.exports = {
  bioland_analysisPacket_bloodPressure: bioland_analysisPacket_bloodPressure
}