import { CalendarAngularDateFormatter } from '../calendar-angular-date-formatter/calendar-angular-date-formatter.provider';
import { Injectable } from '@angular/core';

/**
 * This class is responsible for all formatting of dates. There are 3 implementations available, the `CalendarAngularDateFormatter` (default) which uses the angular date pipe to format dates, the `CalendarNativeDateFormatter` which will use the <a href="https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Intl" target="_blank">Intl</a> API to format dates, or there is the `CalendarMomentDateFormatter` which uses <a href="http://momentjs.com/" target="_blank">moment</a>.
 *
 * If you wish, you may override any of the defaults via angulars DI. For example:
 *
 * ```typescript
 * import { CalendarDateFormatter, DateFormatterParams } from 'angular-calendar';
 * import { formatDate } from '@angular/common';
 * import { Injectable } from '@angular/core';
 *
 * @Injectable()
 * class CustomDateFormatter extends CalendarDateFormatter {
 *
 *   public monthViewColumnHeader({date, locale}: DateFormatterParams): string {
 *     return formatDate(date, 'EEE', locale); // use short week days
 *   }
 *
 * }
 *
 * // in your component that uses the calendar
 * providers: [{
 *   provide: CalendarDateFormatter,
 *   useClass: CustomDateFormatter
 * }]
 * ```
 */
@Injectable()
export class CalendarDateFormatter extends CalendarAngularDateFormatter {}