import { Component, OnInit, ViewEncapsulation } from '@angular/core';
import { FormGroup } from '@angular/forms';
import { MatDialog, MatDialogRef } from '@angular/material/dialog';
import { Subject } from 'rxjs';
import { startOfDay, isSameDay, isSameMonth } from 'date-fns';
import {
  CalendarEvent,
  CalendarEventAction,
  CalendarEventTimesChangedEvent,
  CalendarMonthViewDay
} from 'angular-calendar';

import { FuseConfirmDialogComponent } from 'src/@fuse/components/confirm-dialog/confirm-dialog.component';
import { fuseAnimations } from 'src/@fuse/animations';

import { CalendarService } from './calendar.service';
import { CalendarEventModel } from './event.model';
import { CalendarEventFormDialogComponent } from './event-form/event-form.component';

@Component({
  selector: 'calendar',
  templateUrl: './calendar.component.html',
  styleUrls: ['./calendar.component.scss'],
  encapsulation: ViewEncapsulation.None,
  animations: fuseAnimations
})
export class CalendarComponent implements OnInit {
  actions: CalendarEventAction[];
  activeDayIsOpen: boolean;
  confirmDialogRef: MatDialogRef<FuseConfirmDialogComponent>;
  dialogRef: any;
  events: CalendarEvent[];
  refresh: Subject<any> = new Subject();
  selectedDay: any;
  view: string;
  viewDate: Date;

  constructor(
    private _matDialog: MatDialog,
    private _calendarService: CalendarService
  ) {
    // Set the defaults
    this.view = 'month';
    this.viewDate = new Date();
    this.activeDayIsOpen = true;
    this.selectedDay = { date: startOfDay(new Date()) };

    this.actions = [
      {
        label: '<i class="material-icons s-16">edit</i>',
        onClick: ({ event }: { event: CalendarEvent }): void => {
          this.editEvent('edit', event);
        }
      },
      {
        label: '<i class="material-icons s-16">delete</i>',
        onClick: ({ event }: { event: CalendarEvent }): void => {
          this.deleteEvent(event);
        }
      }
    ];

    /**
     * Get events from service/server
     */
    this.setEvents();
  }

  // -----------------------------------------------------------------------------------------------------
  // @ Lifecycle hooks
  // -----------------------------------------------------------------------------------------------------

  /**
   * On init
   */
  ngOnInit(): void {
    /**
     * Watch re-render-refresh for updating db
     */
    this.refresh.subscribe(updateDB => {
      if (updateDB) {
        this._calendarService.updateEvents(this.events);
      }
    });

    this._calendarService.onEventsUpdated.subscribe(events => {
      this.setEvents();
      this.refresh.next();
    });
  }

  // -----------------------------------------------------------------------------------------------------
  // @ Public methods
  // -----------------------------------------------------------------------------------------------------

  /**
   * Set events
   */
  setEvents(): void {
    // this.events = this._calendarService.events.map(item => {
    //   item.actions = this.actions;
    //   return new CalendarEventModel(item);
    // });
  }

  /**
   * Before View Renderer
   *
   * @param {any} header
   * @param {any} body
   */
  beforeMonthViewRender({ header, body }): void {
    /**
     * Get the selected day
     */
    const _selectedDay = body.find(_day => {
      return _day.date.getTime() === this.selectedDay.date.getTime();
    });

    if (_selectedDay) {
      /**
       * Set selected day style
       * @type {string}
       */
      _selectedDay.cssClass = 'cal-selected';
    }
  }

  /**
   * Day clicked
   *
   * @param {MonthViewDay} day
   */
  dayClicked(day: CalendarMonthViewDay): void {
    const date: Date = day.date;
    const events: CalendarEvent[] = day.events;

    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;
      }
    }
    this.selectedDay = day;
    this.refresh.next();
  }

  /**
   * Event times changed
   * Event dropped or resized
   *
   * @param {CalendarEvent} event
   * @param {Date} newStart
   * @param {Date} newEnd
   */
  eventTimesChanged({
    event,
    newStart,
    newEnd
  }: CalendarEventTimesChangedEvent): void {
    event.start = newStart;
    event.end = newEnd;
    // console.warn('Dropped or resized', event);
    this.refresh.next(true);
  }

  /**
   * Delete Event
   *
   * @param event
   */
  deleteEvent(event): void {
    this.confirmDialogRef = this._matDialog.open(FuseConfirmDialogComponent, {
      disableClose: false
    });

    this.confirmDialogRef.componentInstance.confirmMessage =
      'Are you sure you want to delete?';

    this.confirmDialogRef.afterClosed().subscribe(result => {
      if (result) {
        const eventIndex = this.events.indexOf(event);
        this.events.splice(eventIndex, 1);
        this.refresh.next(true);
      }
      this.confirmDialogRef = null;
    });
  }

  /**
   * Edit Event
   *
   * @param {string} action
   * @param {CalendarEvent} event
   */
  editEvent(action: string, event: CalendarEvent): void {
    const eventIndex = this.events.indexOf(event);

    this.dialogRef = this._matDialog.open(CalendarEventFormDialogComponent, {
      panelClass: 'event-form-dialog',
      data: {
        event: event,
        action: action
      }
    });

    this.dialogRef.afterClosed().subscribe(response => {
      if (!response) {
        return;
      }
      const actionType: string = response[0];
      const formData: FormGroup = response[1];
      switch (actionType) {
        /**
         * Save
         */
        case 'save':
          this.events[eventIndex] = Object.assign(
            this.events[eventIndex],
            formData.getRawValue()
          );
          this.refresh.next(true);

          break;
        /**
         * Delete
         */
        case 'delete':
          this.deleteEvent(event);

          break;
      }
    });
  }

  /**
   * Add Event
   */
  addEvent(): void {
    this.dialogRef = this._matDialog.open(CalendarEventFormDialogComponent, {
      panelClass: 'event-form-dialog',
      data: {
        action: 'new',
        date: this.selectedDay.date
      }
    });
    this.dialogRef.afterClosed().subscribe((response: FormGroup) => {
      if (!response) {
        return;
      }
      const newEvent = response.getRawValue();
      newEvent.actions = this.actions;
      this.events.push(newEvent);
      this.refresh.next(true);
    });
  }
}