import { Component, Input, Output, EventEmitter, TemplateRef } from '@angular/core';
import { WeekDay } from '../../../utils/calendar-utils/CalendarUtils';
import * as dateFns from 'date-fns';

@Component({
    selector: 'novo-calendar-month-header',
    template: `
    <ng-template #defaultTemplate>
      <div class="calendar-header">
        <div class="calendar-header-top">
          <button theme="icon" icon="previous" (click)="prevMonth($event)"></button>
          <div class="calendar-month">{{ viewDate | month:locale }}</div>
          <button theme="icon" icon="next" (click)="nextMonth($event)"></button>
        </div>
        <div class="calendar-weekdays">
          <div
            class="calendar-weekday"
            *ngFor="let day of days"
            [class.calendar-past]="day.isPast"
            [class.calendar-today]="day.isToday"
            [class.calendar-future]="day.isFuture"
            [class.calendar-weekend]="day.isWeekend">
            {{ day.date | weekday:locale }}
          </div>
        </div>
      </div>
    </ng-template>
    <ng-template
      [ngTemplateOutlet]="customTemplate || defaultTemplate"
      [ngOutletContext]="{days: days, locale: locale, viewDate: viewDate}">
    </ng-template>
  `
})
export class NovoCalendarMonthHeaderElement {
    @Input() viewDate: Date;

    @Input() days: WeekDay[];

    @Input() locale: string;

    @Input() customTemplate: TemplateRef<any>;

    /**
     * Called when the view date is changed
     */
    @Output() viewDateChange: EventEmitter<Date> = new EventEmitter();

    prevMonth() {
        this.viewDateChange.emit(dateFns.subMonths(this.viewDate, 1));
    }

    nextMonth() {
        this.viewDateChange.emit(dateFns.addMonths(this.viewDate, 1));
    }

}