import { QRData } from './QRData';
import { Mode } from './Mode';
import { BitBuffer } from './BitBuffer';

'use strict';
/**
 * QRNumber
 * @author Kazuhiko Arase
 */
export class QRNumber extends QRData {

  constructor(data: string) {
    super(Mode.MODE_NUMBER, data);
  }

  public write(buffer: BitBuffer): void {

    var data = this.getData();

    var i = 0;

    while (i + 2 < data.length) {
      buffer.put(QRNumber.strToNum(data.substring(i, i + 3)), 10);
      i += 3;
    }

    if (i < data.length) {
      if (data.length - i == 1) {
        buffer.put(QRNumber.strToNum(data.substring(i, i + 1)), 4);
      } else if (data.length - i == 2) {
        buffer.put(QRNumber.strToNum(data.substring(i, i + 2)), 7);
      }
    }
  }

  public getLength(): number {
    return this.getData().length;
  }

  private static strToNum(s: string): number {
    var num = 0;
    for (var i = 0; i < s.length; i += 1) {
      num = num * 10 + QRNumber.chatToNum(s.charAt(i));
    }
    return num;
  }

  private static chatToNum(c: string): number {
    if ('0' <= c && c <= '9') {
      return c.charCodeAt(0) - '0'.charCodeAt(0);
    }
    throw 'illegal char :' + c;
  }
}