import { BluetoothUtils, Device } from "@/bluetooth-utils";
import { wait } from "@r-utils/common";


type DeviceData = Required<Device>;

export class Printer {
  device: DeviceData;
  size = 0;

  constructor(device: DeviceData, { size = 80 } = {}) {
    this.device = device;
    this.size = size;
  }

  async print(data: number[]) {
    console.log(
      data.length,
      data.slice(0, 100),
      data.slice(data.length - 100, data.length)
    );
    let res = null;
    const systemInfo = uni.getSystemInfoSync();
    if (systemInfo.uniPlatform === "app" && systemInfo.osName === "android") {
      res = await BluetoothUtils.sendDataAndroid(this.device, data);
    } else {
      res = await BluetoothUtils.bindDevice(this.device, async () => {
        await wait(100);
        return await this._print(data);
      });
    }

    return res;
  }

  async _print(data: number[]):Promise<any> {
    const size = Math.min(data.length, this.size);
    if (size === 0) {
      return;
    }
    const buf = new ArrayBuffer(size);
    const dataView = new DataView(buf);
    for (let i = 0; i < size; i++) {
      dataView.setUint8(i, data[i]);
    }

    await new Promise((resolve, reject) => {
      uni.writeBLECharacteristicValue({
        deviceId: this.device.deviceId,
        serviceId: this.device.writeServiceId,
        characteristicId: this.device.writeCharacterId,
        value: buf,
        success: (res) => {
          resolve(res);
        },
        fail: (err) => {
          reject(err);
        },
      });
    });

    await wait(30);
    return await this._print(data.slice(size));
  }
}