import { Injectable } from '@angular/core';
import { addDays, differenceInDays, format } from 'date-fns';

@Injectable({
	providedIn: 'root',
})
export class DateUtilsService {
	public static addDaysToDate(days: number, date: Date): Date {
		return addDays(date, days);
	}

	public static diffInDays(dateLeft: Date, dateRight: Date): number {
		return differenceInDays(dateLeft, dateRight);
	}

	public static formatDate(date): string {
		return format(date, 'yyyy-MM-dd');
	}

	public static orderDates(): Date[] {
		// TODO: to implement
		const datesOrdered: Date[] = [];
		return datesOrdered;
	}

	public static getDatesInRange(d1: Date, d2: Date, interval: number): Date[] {
		// TODO: refacto this
		d1 = new Date(d1);
		d2 = new Date(d2);
		const dates = [];
		while (+d1 < +d2) {
			dates.push({
				literal: this.formateDate(d1),
				date_object: d1,
			});
			d1.setDate(d1.getDate() + interval);
		}
		return [...dates];
	}

	public static getDoubleDigits(str: string): string {
		// TODO: ça sert à quoi ça ?
		// Parce que ajouter 2 caractère à une string et ensuite slicer à partir du 2ème caractère, euh…
		return ('00' + str).slice(-2);
	}

	private isInChronologicalOrder(date1: Date, date2: Date): boolean {
		return date1 < date2;
	}
}