import { Component, Input, OnChanges, SimpleChanges, signal } from '@angular/core';
import { VideoItem } from '../../models/video-item.model';
import { CommonModule } from '@angular/common';
import { RouterLink } from '@angular/router';
import { DurationPipe } from '../../pipes/duration.pipe';
import { ProviderBadgeComponent } from '../provider-badge/provider-badge.component';
import { SubscribeButtonComponent } from '../subscribe-button/subscribe-button.component';
import { ChannelIdentityComponent } from '../channel-identity/channel-identity.component';
import type { ChannelMeta, ProviderId } from '../../models/channel.model';

@Component({
  selector: 'app-video-card',
  templateUrl: './video-card.component.html',
  styleUrls: ['./video-card.component.scss'],
  standalone: true,
  imports: [CommonModule, RouterLink, DurationPipe, ProviderBadgeComponent, SubscribeButtonComponent, ChannelIdentityComponent],
})
export class VideoCardComponent implements OnChanges {
  @Input() video!: VideoItem;
  /** Cartes du haut de la grille : chargement immédiat (lazy désactivé). */
  @Input() eager = false;

  /**
   * État de chargement de la frame (miniature). Tant que l'image n'a pas
   * répondu, la frame affiche un shimmer + spinner au lieu d'un rectangle vide.
   */
  readonly thumbSrc = signal<string | null>(null);
  readonly thumbLoaded = signal(false);
  readonly thumbFailed = signal(false);

  ngOnChanges(_changes: SimpleChanges): void {
    this.syncThumb();
  }

  private syncThumb(): void {
    const raw = (this.video as any)?.thumbnailUrl;
    const url = typeof raw === 'string' && raw.trim().length > 0 ? raw.trim() : null;
    if (url === this.thumbSrc()) {
      // Meme source : le navigateur ne rejouera pas `load`, on garde l'etat
      // courant (sinon le spinner resterait bloque indefiniment).
      this.thumbFailed.set(!url);
      return;
    }
    this.thumbSrc.set(url);
    this.thumbFailed.set(!url);
    this.thumbLoaded.set(false);
  }

  onThumbLoad(): void {
    this.thumbLoaded.set(true);
    this.thumbFailed.set(false);
  }

  onThumbError(): void {
    this.thumbLoaded.set(false);
    this.thumbFailed.set(true);
  }

  /** Relance l'image après un échec (hotlink bloqué / 403 / réseau). */
  retryThumb(): void {
    const url = this.thumbSrc();
    if (!url) return;
    this.thumbFailed.set(false);
    this.thumbLoaded.set(false);
    this.thumbSrc.set(null);
    // Relance après un tick : le <img> est réellement recréé par le binding.
    setTimeout(() => this.thumbSrc.set(url), 0);
  }

  buildQueryParams(v: VideoItem): Record<string, any> {
    const qp: any = { p: v.provider };
    if (v.provider === 'odysee' && v.slug) qp.slug = v.slug;
    // Twitch : chaînes/lives via ?channel=<login>, clips via ?clip=<slug>.
    if (v.provider === 'twitch') {
      const kind = String((v as any)?.type || '').toLowerCase();
      const clipKind = String((v as any)?.kind || '').toLowerCase();
      if (clipKind === 'clip') qp.clip = v.id;
      else if ((kind === 'live' || kind === 'channel') && v.channel) qp.channel = v.channel;
    }
    return qp;
  }

  get isTwitchLive(): boolean {
    const v: any = this.video;
    return v?.provider === 'twitch' && (v?.isLive === true || String(v?.type || '').toLowerCase() === 'live');
  }

  get isTwitchChannel(): boolean {
    const v: any = this.video;
    return v?.provider === 'twitch' && String(v?.type || '').toLowerCase() === 'channel' && v?.isLive !== true;
  }

  get isTwitchClip(): boolean {
    const v: any = this.video;
    return v?.provider === 'twitch' && String(v?.kind || '').toLowerCase() === 'clip';
  }

  get showDuration(): boolean {
    const d = Number((this.video as any)?.durationSec ?? NaN);
    return Number.isFinite(d) && d > 0;
  }

  get providerId(): string {
    return String((this.video as any)?.provider || '');
  }

  get channelProviderId(): ProviderId | null {
    const map: Record<VideoItem['provider'], ProviderId> = {
      youtube: 'yt',
      dailymotion: 'dm',
      twitch: 'tw',
      peertube: 'pt',
      odysee: 'od',
      rumble: 'ru',
    };
    return map[this.video.provider] || null;
  }

  channelExternalId(): string | null {
    return this.video.channelMeta?.externalId ?? this.video.channelExternalId ?? null;
  }

  channelAvatarUrl(): string | null {
    return this.video.channelMeta?.avatarUrl ?? this.video.channelAvatarUrl ?? null;
  }

  channelDisplayName(channel?: ChannelMeta | null, fallback?: string | null): string {
    const preferred = (channel?.title || channel?.handle || fallback || '').toString().trim();
    if (preferred.length > 0) {
      return preferred;
    }
    return (channel?.externalId || '').trim();
  }

  get showSubscribe(): boolean {
    return Boolean(this.video.channelMeta && this.channelProviderId && this.channelExternalId());
  }
}