import { createErrorFromCode, SFPToolboxError, SFPToolboxErrorCode } from '../../error/error';

import base64ToArrayBuffer from 'base64-arraybuffer';

export class ChangeTimeClerk {
  resolve: Function;
  reject: (error: SFPToolboxError) => void;
  onBeginReading: Function;
  result: number | null;

  constructor(resolver: Function, rejecter: (error: SFPToolboxError) => void, onBeginReading: Function) {
    this.resolve = resolver;
    this.reject = rejecter;
    this.onBeginReading = onBeginReading;
    this.result = null;
  }

  appendString(aString: string) {
    if (this.getResult() == null) {
      this.onBeginReading?.();
    }

    this.result = new Uint8Array(base64ToArrayBuffer.decode(aString))[0] ?? null;
    if (this.result === 0) {
      this.resolve(null);
    } else {
      this.reject(createErrorFromCode(SFPToolboxErrorCode.ChangeTimeWentWrong));
    }
  }

  getResult() {
    return this.result;
  }
}