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

@Injectable()
export class DateService {
    private milliSeconInDay: number;

    constructor() {
        this.milliSeconInDay = 1000 * 60 * 60 * 24;
    }

    public AddDays(currentDate: Date, nbDays: number): Date {
        const totalMilliSeconds = nbDays * this.milliSeconInDay;
        const currentTime = currentDate.getTime();

        currentDate.setTime(currentTime + totalMilliSeconds);

        return currentDate;
    }

    public DiffBetweenDates(beginDate: Date, endDate: Date): number {
        const diffInTime = endDate.getTime() - beginDate.getTime();
        const diffInDays = Math.round(diffInTime / (1000 * 3600 * 24));

        return diffInDays;
    }
}