import {
  Component,
  ChangeDetectionStrategy,
  Inject,
  ViewChild,
  TemplateRef
} from '@angular/core';
import { DOCUMENT } from "@angular/common";
import { NgbModal, ModalDismissReasons } from '@ng-bootstrap/ng-bootstrap';

import {
  startOfDay,
  endOfDay,
  subDays,
  addDays,
  endOfMonth,
  isSameDay,
  isSameMonth,
  addHours
} from 'date-fns';

import { Subject } from 'rxjs/Subject';

import {
  CalendarEvent,
  CalendarEventAction,
  CalendarEventTimesChangedEvent
} from 'angular-calendar';

const colors: any = {
  red: {
    primary: '#ad2121',
    secondary: '#FAE3E3'
  },
  blue: {
    primary: '#1e90ff',
    secondary: '#D1E8FF'
  },
  yellow: {
    primary: '#e3bc08',
    secondary: '#FDF1BA'
  }
};

@Component({
  selector: 'app-fullcalendar',
  changeDetection: ChangeDetectionStrategy.OnPush,
  templateUrl: './fullcalendar.component.html',
  styleUrls: ['./fullcalendar.component.scss']
})
export class FullcalendarComponent {
  @ViewChild('modalContent', {static: true}) modalContent: TemplateRef<any>;

  view = 'month';

  viewDate: Date = new Date();

  modalData: {
    action: string;
    event: CalendarEvent;
  };

  actions: CalendarEventAction[] = [
    {
      label: '<i class="fa fa-fw fa-pencil text-white"></i>',
      onClick: ({ event }: { event: CalendarEvent }): void => {
        this.handleEvent('Edited', event);
      }
    },
    {
      label: '<i class="fa fa-fw fa-times  text-white"></i>',
      onClick: ({ event }: { event: CalendarEvent }): void => {
        this.events = this.events.filter(iEvent => iEvent !== event);
        this.handleEvent('Deleted', event);
      }
    }
  ];

  refresh: Subject<any> = new Subject();

  events: CalendarEvent[] = [
    {
      start: subDays(startOfDay(new Date()), 1),
      end: addDays(new Date(), 1),
      title: 'A 3 day event',
      color: colors.red,
      actions: this.actions
    },
    {
      start: startOfDay(new Date()),
      title: 'An event with no end date',
      color: colors.yellow,
      actions: this.actions
    },
    {
      start: subDays(endOfMonth(new Date()), 3),
      end: addDays(endOfMonth(new Date()), 3),
      title: 'A long event that spans 2 months',
      color: colors.blue
    },
    {
      start: addHours(startOfDay(new Date()), 2),
      end: new Date(),
      title: 'A draggable and resizable event',
      color: colors.yellow,
      actions: this.actions,
      resizable: {
        beforeStart: true,
        afterEnd: true
      },
      draggable: true
    }
  ];

  activeDayIsOpen = true;

  constructor(private modal: NgbModal, @Inject(DOCUMENT) doc: any) {}

  dayClicked({ date, events }: { date: Date; events: CalendarEvent[] }): void {
    if (isSameMonth(date, this.viewDate)) {
      if (
        (isSameDay(this.viewDate, date) && this.activeDayIsOpen === true) ||
        events.length === 0
      ) {
        this.activeDayIsOpen = false;
      } else {
        this.activeDayIsOpen = true;
        this.viewDate = date;
      }
    }
  }

  eventTimesChanged({
    event,
    newStart,
    newEnd
  }: CalendarEventTimesChangedEvent): void {
    event.start = newStart;
    event.end = newEnd;
    this.handleEvent('Dropped or resized', event);
    this.refresh.next();
  }

  handleEvent(action: string, event: CalendarEvent): void {
    this.modalData = { event, action };
    this.modal.open(this.modalContent, { size: 'lg' });
  }

  addEvent(): void {
    this.events.push({
      title: 'New event',
      start: startOfDay(new Date()),
      end: endOfDay(new Date()),
      color: colors.red,
      draggable: true,
      resizable: {
        beforeStart: true,
        afterEnd: true
      }
    });
    this.refresh.next();
  }
}
