import { Component, ChangeDetectionStrategy, Input, Output, EventEmitter, ViewChild, ElementRef, AfterViewInit } from '@angular/core';
import { CommonModule } from '@angular/common';
import { ButtonComponent, IconComponent, SkeletonComponent, TooltipDirective } from '@sda/base-ui';
import type { TlTimelineItem } from '../../types/timeline.types';
import type { TlMarkerSize, TlConnectorStyle, TlSortDirection } from '../../types/config.types';
import type { TlTimelineItemClickEvent } from '../../types/event.types';
import { formatSmartTime } from '../../utils/date.utils';

@Component({
  selector: 'tl-horizontal-timeline',
  standalone: true,
  imports: [CommonModule, ButtonComponent, IconComponent, SkeletonComponent, TooltipDirective],
  templateUrl: './tl-horizontal-timeline.component.html',
  styleUrl: './tl-horizontal-timeline.component.scss',
  changeDetection: ChangeDetectionStrategy.OnPush,
})
export class TlHorizontalTimelineComponent implements AfterViewInit {
  @ViewChild('scrollContainer') scrollContainer?: ElementRef<HTMLDivElement>;

  @Input({ required: true }) items!: TlTimelineItem[];
  @Input() markerSize: TlMarkerSize = 'md';
  @Input() connectorStyle: TlConnectorStyle = 'solid';
  @Input() sortDirection: TlSortDirection = 'desc';
  @Input() scrollable = true;
  @Input() showNavArrows = true;
  @Input() loading = false;
  @Input() emptyMessage = 'No timeline items';

  @Output() itemClick = new EventEmitter<TlTimelineItemClickEvent>();

  protected canScrollLeft = false;
  protected canScrollRight = false;

  protected get sortedItems(): TlTimelineItem[] {
    const items = [...this.items];
    const direction = this.sortDirection;

    items.sort((a, b) => {
      const aTime = new Date(a.date).getTime();
      const bTime = new Date(b.date).getTime();
      return direction === 'asc' ? aTime - bTime : bTime - aTime;
    });

    return items;
  }

  ngAfterViewInit(): void {
    this.updateScrollState();
  }

  protected formatTime(item: TlTimelineItem): string {
    return formatSmartTime(item.date);
  }

  protected getMarkerColor(item: TlTimelineItem): string {
    if (item.iconColor) return item.iconColor;
    if (item.status) return `var(--tl-status-${item.status})`;
    return 'var(--tl-marker-bg)';
  }

  protected onItemClick(item: TlTimelineItem, index: number): void {
    this.itemClick.emit({ item, index });
  }

  protected scrollLeft(): void {
    const container = this.scrollContainer?.nativeElement;
    if (container) {
      container.scrollBy({ left: -200, behavior: 'smooth' });
      setTimeout(() => this.updateScrollState(), 300);
    }
  }

  protected scrollRight(): void {
    const container = this.scrollContainer?.nativeElement;
    if (container) {
      container.scrollBy({ left: 200, behavior: 'smooth' });
      setTimeout(() => this.updateScrollState(), 300);
    }
  }

  protected updateScrollState(): void {
    const container = this.scrollContainer?.nativeElement;
    if (container) {
      this.canScrollLeft = container.scrollLeft > 0;
      this.canScrollRight = container.scrollLeft < container.scrollWidth - container.clientWidth - 1;
    }
  }

  protected getLoadingItems(): number[] {
    return Array.from({ length: 5 }, (_, i) => i);
  }
}