import {
  Directive, ElementRef, EventEmitter, Input, OnDestroy, OnInit, Output,
  Renderer2, TemplateRef, ViewContainerRef
} from '@angular/core';
import { PopoverConfig } from './popover.config';
import { ComponentLoader, ComponentLoaderFactory } from 'ngx-bootstrap/component-loader';
import { PopoverContainerComponent } from './popover-container.component';
import { PositioningService, AvailbleBSPositions } from 'ngx-bootstrap/positioning';
import { timer } from 'rxjs';
import { parseTriggers, Trigger } from 'ngx-bootstrap/utils';

let id = 0;

/**
 * A lightweight, extensible directive for fancy popover creation.
 */
@Directive({selector: '[popover]', exportAs: 'bs-popover'})
export class PopoverDirective implements OnInit, OnDestroy {
  /** unique id popover - use for aria-describedby */
  popoverId = id++;
  /** sets disable adaptive position */
  @Input() adaptivePosition = true;

  @Input() boundariesElement?: ('viewport' | 'scrollParent' | 'window');
  /**
   * Content to be displayed as popover.
   */
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  @Input() popover?: string | TemplateRef<any>;
  /**
   * Context to be used if popover is a template.
   */
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  @Input() popoverContext: any;
  /**
   * Title of a popover.
   */
  @Input() popoverTitle?: string;
  /**
   * Placement of a popover. Accepts: "top", "bottom", "left", "right"
   */
  @Input() placement: AvailbleBSPositions = 'top';
  /**
   * Close popover on outside click
   */
  @Input() outsideClick = false;
  /**
   * Specifies events that should trigger. Supports a space separated list of
   * event names.
   */
  @Input() triggers = 'click';
  /**
   * A selector specifying the element the popover should be appended to.
   */
  @Input() container?: string;

  /**
   * Css class for popover container
   */
  @Input() containerClass = '';

  /**
   * Returns whether or not the popover is currently being shown
   */
  @Input()
  get isOpen(): boolean {
    return this._popover.isShown;
  }

  set isOpen(value: boolean) {
    if (value) {
      this.show();
    } else {
      this.hide();
    }
  }

  /**
   * Delay before showing the tooltip
   */
  @Input() delay = 0;

  /**
   * Emits an event when the popover is shown
   */
  @Output() onShown: EventEmitter<unknown>;
  /**
   * Emits an event when the popover is hidden
   */
  @Output() onHidden: EventEmitter<unknown>;

  protected _popoverCancelShowFn?: () => void;

  protected _delayTimeoutId?: number;

  private _popover: ComponentLoader<PopoverContainerComponent>;
  private _isInited = false;
  private _ariaDescribedby?: string;

  constructor(
    _config: PopoverConfig,
    private _elementRef: ElementRef,
    private _renderer: Renderer2,
    _viewContainerRef: ViewContainerRef,
    cis: ComponentLoaderFactory,
    private _positionService: PositioningService
  ) {
    this._popover = cis
      .createLoader<PopoverContainerComponent>(
        _elementRef,
        _viewContainerRef,
        _renderer
      )
      .provide({provide: PopoverConfig, useValue: _config});

    Object.assign(this, _config);

    this.onShown = this._popover.onShown;
    this.onHidden = this._popover.onHidden;

    // fix: no focus on button on Mac OS #1795
    if (typeof window !== 'undefined') {
      _elementRef.nativeElement.addEventListener('click', function () {
        try {
          _elementRef.nativeElement.focus();
        } catch (err) {
          return;
        }
      });
    }
  }

  /**
   * Set attribute aria-describedBy for element directive and
   * set id for the popover
   */
  setAriaDescribedBy(): void {
    this._ariaDescribedby = this.isOpen ? `ngx-popover-${this.popoverId}` : void 0;
    if (this._ariaDescribedby) {
      if (this._popover.instance) {
        this._popover.instance.popoverId = this._ariaDescribedby;
      }
      this._renderer.setAttribute(this._elementRef.nativeElement, 'aria-describedby', this._ariaDescribedby);
    } else {
      this._renderer.removeAttribute(this._elementRef.nativeElement, 'aria-describedby');
    }
  }

  /**
   * Opens an element’s popover. This is considered a “manual” triggering of
   * the popover.
   */
  show(): void {
    if (this._popover.isShown || !this.popover || this._delayTimeoutId) {
      return;
    }

    this._positionService.setOptions({
      modifiers: {
        flip: {
          enabled: this.adaptivePosition
        },
        preventOverflow: {
          enabled: this.adaptivePosition,
          boundariesElement: this.boundariesElement || 'scrollParent' 
        }
      }
    });

    const showPopover = () => {
      if (this._delayTimeoutId) {
        this._delayTimeoutId = undefined;
      }

      this._popover
        .attach(PopoverContainerComponent)
        .to(this.container)
        .position({attachment: this.placement})
        .show({
          content: this.popover,
          context: this.popoverContext,
          placement: this.placement,
          title: this.popoverTitle,
          containerClass: this.containerClass
        });

      if (!this.adaptivePosition && this._popover._componentRef) {
        this._positionService.calcPosition();
        this._positionService.deletePositionElement(this._popover._componentRef.location);
      }

      this.isOpen = true;
      this.setAriaDescribedBy();
    };

    const cancelDelayedTooltipShowing = () => {
      if (this._popoverCancelShowFn) {
        this._popoverCancelShowFn();
      }
    };

    if (this.delay) {
      const _timer = timer(this.delay).subscribe(() => {
        showPopover();
        cancelDelayedTooltipShowing();
      });

      if (this.triggers) {
        parseTriggers(this.triggers)
          .forEach((trigger: Trigger) => {
            if (!trigger.close) {
              return;
            }

            this._popoverCancelShowFn = this._renderer.listen(
              this._elementRef.nativeElement,
              trigger.close,
              () => {
                _timer.unsubscribe();
                cancelDelayedTooltipShowing();
              }
            );
          });
      }
    } else {
      showPopover();
    }
  }

  /**
   * Closes an element’s popover. This is considered a “manual” triggering of
   * the popover.
   */
  hide(): void {
    if (this._delayTimeoutId) {
      clearTimeout(this._delayTimeoutId);
      this._delayTimeoutId = undefined;
    }

    if (this.isOpen) {
      this._popover.hide();
      this.setAriaDescribedBy();
      this.isOpen = false;
    }
  }

  /**
   * Toggles an element’s popover. This is considered a “manual” triggering of
   * the popover.
   */
  toggle(): void {
    if (this.isOpen) {
      return this.hide();
    }

    this.show();
  }

  ngOnInit(): void {
    // fix: seems there are an issue with `routerLinkActive`
    // which result in duplicated call ngOnInit without call to ngOnDestroy
    // read more: https://github.com/valor-software/ngx-bootstrap/issues/1885
    if (this._isInited) {
      return;
    }
    this._isInited = true;

    this._popover.listen({
      triggers: this.triggers,
      outsideClick: this.outsideClick,
      show: () => this.show(),
      hide: () => this.hide()
    });
  }

  ngOnDestroy(): void {
    this._popover.dispose();
  }
}