import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  number: number;
  hasValidNumber: boolean;
  numberBinary: string;
  private _numberRegex: RegExp = new RegExp("^[0-9]+$");
  private _numberString: string = "";

  get numberString(): string {
    return this._numberString;
  }

  set numberString(newNumberString: string) {
    this._numberString = newNumberString;
    this.hasValidNumber = this.validateNumber(newNumberString);

    if (this.hasValidNumber) {
      this.number = AppComponent.stringToNumber(newNumberString);
      this.numberBinary = AppComponent.numberToBinary(this.number);
    }
  }

  private validateNumber(numberString: string): boolean {
    return this._numberRegex.test(numberString);
  }

  private static stringToNumber(numberString: string): number {
    let convertedNumber: number = 0;
    let numberStringLength: number = numberString.length;
    let currentMultiplier: number = 1;
    let zeroCharCode: number = "0".charCodeAt(0);

    for (let i: number = numberStringLength - 1; i >= 0; i--) {
      let currentCharCode = numberString.charCodeAt(i);
      convertedNumber += (currentCharCode - zeroCharCode) * currentMultiplier;
      currentMultiplier *= 10;
    }

    return convertedNumber;
  }

  private static numberToBinary(number: number): string {
    let numberBinaryRepresentation: string = "";

    while (number != 0) {
      numberBinaryRepresentation += (number & 1) == 0 ? "0" : "1";
      number >>= 1;
    }

    return numberBinaryRepresentation.split("").reverse().join("");
  }
}