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

@Injectable({
  providedIn: 'root'
})
export class ValidationService {

  constructor() { }

  public validateDocument(document: number): boolean{
    if (!this.isNumberWithAtMostDesiredDigits(document, 5)) {
      return false;
     }
     return true;
  }

  private getBaseLog(x: number, y: number): number {
    return Math.log(y) / Math.log(x);
  }

  private isNumberWithAtMostDesiredDigits(document: number, minDigits: number): boolean {
    return this.getBaseLog(10, document) + 1 >= minDigits;
  }
}