import { Component, ChangeDetectionStrategy, input, output, computed, signal } from '@angular/core';
import { TitleCasePipe } from '@angular/common';
import { BadgeComponent, IconComponent, ButtonComponent } from '@sda/base-ui';
import type { TlChangelogVersion, TlChangeCategory } from '../../types/changelog.types';
import type { TlVersionClickEvent, TlChangelogEntryClickEvent } from '../../types/event.types';
import { formatDate } from '../../utils/date.utils';

@Component({
  selector: 'tl-changelog-version',
  standalone: true,
  imports: [BadgeComponent, IconComponent, ButtonComponent, TitleCasePipe],
  templateUrl: './tl-changelog-version.component.html',
  styleUrl: './tl-changelog-version.component.scss',
  changeDetection: ChangeDetectionStrategy.OnPush,
  host: {
    '[class.tl-changelog-version--collapsible]': 'collapsible()',
    '[class.tl-changelog-version--expanded]': 'isExpanded()',
  },
})
export class TlChangelogVersionComponent {
  readonly version = input.required<TlChangelogVersion>();
  readonly collapsible = input(false);
  readonly expanded = input(true);
  readonly showCategoryBadges = input(true);
  readonly showBreakingBadge = input(true);

  readonly versionClick = output<TlVersionClickEvent>();
  readonly entryClick = output<TlChangelogEntryClickEvent>();
  readonly expandToggle = output<boolean>();

  protected readonly isExpanded = signal(true);

  protected readonly formattedDate = computed(() => formatDate(this.version().date));

  protected readonly entriesByCategory = computed(() => {
    const entries = this.version().entries;
    const categories: TlChangeCategory[] = ['added', 'changed', 'fixed', 'removed', 'deprecated', 'security'];

    return categories
      .map(category => ({
        category,
        entries: entries.filter(e => e.category === category),
      }))
      .filter(group => group.entries.length > 0);
  });

  protected readonly categoryColor = computed(() => {
    return (category: TlChangeCategory): string => {
      return `var(--tl-change-${category})`;
    };
  });

  protected readonly categoryIcon = computed(() => {
    return (category: TlChangeCategory): string => {
      switch (category) {
        case 'added': return 'plus';
        case 'changed': return 'edit';
        case 'fixed': return 'check';
        case 'removed': return 'minus';
        case 'deprecated': return 'alert-triangle';
        case 'security': return 'shield';
        default: return 'circle';
      }
    };
  });

  protected onVersionClick(): void {
    this.versionClick.emit({ version: this.version() });
    if (this.collapsible()) {
      this.toggleExpand();
    }
  }

  protected toggleExpand(): void {
    this.isExpanded.update(v => !v);
    this.expandToggle.emit(this.isExpanded());
  }

  protected onEntryClick(entry: any): void {
    this.entryClick.emit({ entry, version: this.version() });
  }
}