// bluetoothService.js
const COMMAND = {
  START_FREE_JUMP_ROPE: 0x03,
  PAUSE: 0x04,
  RESUME: 0x05,
  STOP: 0x06,
  GET_COUNT: 'Get CT', 
  START_COUNT: 'Start Count',
  STOP_COUNT: 'Stop Count',
  CLEAN_COUNT: 'Clean Count',
  GET_BATTERY: 'Get Batt'
};

const DEVICE_TYPE = {
  YD_O1: 'YD-O1',
  YD_Jump: 'YD_Jump'
};

function startFreeJumpRope(deviceId, serviceId, type) {
  const characteristic = wx.getStorageSync('writeCharacteristic');
  if (!characteristic) {
    console.error('没有可写的特征值');
    return;
  }
  const commandData = new ArrayBuffer(4);
  const dataView = new DataView(commandData);
  dataView.setUint8(0, COMMAND.START_FREE_JUMP_ROPE);
  dataView.setUint8(1, type);
  dataView.setUint8(2, 0x00);
  dataView.setUint8(3, 0x00);

  wx.writeBLECharacteristicValue({
    deviceId: deviceId,
    serviceId: serviceId,
    characteristicId: characteristic,
    value: commandData,
    success: () => {
      console.log("自由跳绳已启动！");
    },
    fail: (error) => {
      console.error("启动自由跳绳失败", error);
    }
  });
}

function sendCommandJump(deviceId, serviceId, codeStr) {
  const characteristic = wx.getStorageSync('writeCharacteristic');
  if (!characteristic) {
    console.error('没有可写的特征值');
    return;
  }
  const startCommand = `$${codeStr}!`;
  const commandData = stringToArrayBuffer(startCommand);
  wx.writeBLECharacteristicValue({
    deviceId: deviceId,
    serviceId: serviceId,
    characteristicId: characteristic,
    value: commandData,
    success: () => {
      console.log(codeStr, "命令发送成功");
    },
    fail: (error) => {
      console.error(codeStr, "命令发送失败", error);
    }
  });
}

function stringToArrayBuffer(str) {
  const buffer = new ArrayBuffer(str.length);
  const view = new Uint8Array(buffer);
  for (let i = 0; i < str.length; i++) {
    view[i] = str.charCodeAt(i) & 0xFF;
  }
  return buffer;
}

// 获取设备电量，根据设备型号发送不同协议的命令
function getBattery(deviceId, serviceId, deviceName) {
  const characteristic = wx.getStorageSync('writeCharacteristic');
  if (!characteristic) {
    console.error('没有可写的特征值');
    return;
  }

  if (deviceName === DEVICE_TYPE.YD_O1) {
    // YD-O1：二进制协议获取电量
    const commandData = new ArrayBuffer(4);
    const dataView = new DataView(commandData);
    dataView.setUint8(0, 0x07); // 获取电量命令字节
    dataView.setUint8(1, 0x00);
    dataView.setUint8(2, 0x00);
    dataView.setUint8(3, 0x00);
    wx.writeBLECharacteristicValue({
      deviceId,
      serviceId,
      characteristicId: characteristic,
      value: commandData,
      success: () => console.log('YD-O1 获取电量命令已发送'),
      fail: err => console.error('YD-O1 获取电量命令失败', err)
    });
  } else {
    // YD_Jump / YD-Jump：字符串协议获取电量
    sendCommandJump(deviceId, serviceId, COMMAND.GET_BATTERY);
  }
}

module.exports = {
  COMMAND,
  DEVICE_TYPE,
  startFreeJumpRope,
  sendCommandJump,
  getBattery
};