export const monitorSerialData = {
  data() {
    return {
      serialPort: null,
      reader: null,
      decoder: new TextDecoder(),
      barcode: '',//临时拼装数据使用
      serialData: ''//获得的最终的条码数据

    };
  },
  methods: {
    checkSerialConnected() {
      if (this.serialPort && this.serialPort.readable) {
        console.log("串口当前已连接");
        return true;
      } else {
        console.log("串口未连接或已断开");
        return false;
      }
    },


    async connectSerial(callback) {
      if ('serial' in navigator) {
        console.log("serial support")
        try {
          // 请求串口访问权限
          this.serialPort = await navigator.serial.requestPort();
          await this.serialPort.open({baudRate: 9600}); // 假设条码枪的波特率为9600

          // 设置数据流解码
          this.decoder = new TextDecoderStream();
          const readableStreamClosed = this.serialPort.readable.pipeTo(this.decoder.writable);
          this.reader = this.decoder.readable.getReader();

          // 监听串口数据
          while (true) {
            const {value, done} = await this.reader.read();
            if (done) {
              this.reader.releaseLock();
              break;
            }

            // console.log("---"+value);
            // const data = this.decoder.decode(value);
            this.processReceivedData(value, callback);
          }
        } catch (error) {
          console.error('连接或读取串口时发生错误:', error);
        } finally {
          this.reader.releaseLock();
          await this.serialPort.close();
        }
      }
    },

    processReceivedData(data, callback) {
      // 假设条码数据以回车符或换行符结束
      const barcodeEnd = /\r|\n/;
      // console.log("---:" + data)
      if (barcodeEnd.test(data)) {
        const barcode = data.split(barcodeEnd)[0].trim(); // 获取并清理条码数据
        console.log('扫描到的条码:', this.barcode + barcode);
        this.serialData = this.barcode + barcode;
        // 调用传入的函数
        if (typeof callback === 'function') {
          callback();
        }
        this.barcode = '';
      } else {
        this.barcode += data;
      }
    },
  }
};