import {
  property,
  state,
  html,
  customElement,
  css,
  cssManager,
  type TemplateResult,
  type CSSResult,
} from '@design.estate/dees-element';
import { DeesTileBase } from '../dees-tile-shared/DeesTileBase.js';
import { tileBaseStyles } from '../dees-tile-shared/styles.js';
import { demo } from './demo.js';

declare global {
  interface HTMLElementTagNameMap {
    'dees-tile-video': DeesTileVideo;
  }
}

@customElement('dees-tile-video')
export class DeesTileVideo extends DeesTileBase {
  public static demo = demo;
  public static demoGroups = ['Media'];
  public static styles = [
    ...tileBaseStyles,
    css`
      .video-wrapper {
        position: relative;
        width: 100%;
        height: 100%;
        overflow: hidden;
        background: #000;
      }

      .video-wrapper video {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
      }

      .video-wrapper canvas {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
      }

      .poster-image {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
      }

      .duration-badge {
        position: absolute;
        bottom: 8px;
        right: 8px;
        padding: 3px 8px;
        background: rgba(0, 0, 0, 0.7);
        color: white;
        border-radius: 4px;
        font-size: 10px;
        font-weight: 600;
        font-variant-numeric: tabular-nums;
        backdrop-filter: blur(8px);
        z-index: 10;
      }

      .play-overlay {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 48px;
        height: 48px;
        border-radius: 50%;
        background: rgba(0, 0, 0, 0.6);
        display: flex;
        align-items: center;
        justify-content: center;
        z-index: 15;
        pointer-events: none;
        transition: opacity 0.2s ease;
      }

      .play-overlay dees-icon {
        font-size: 20px;
        color: white;
      }

      .tile-container.clickable:hover .play-overlay {
        opacity: 0;
      }

      .video-hover-preview {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        object-fit: cover;
        z-index: 5;
        opacity: 0;
        transition: opacity 0.3s ease;
      }

      .video-hover-preview.active {
        opacity: 1;
      }
    `,
  ] as any;

  @property({ type: String })
  accessor src: string = '';

  @property({ type: String })
  accessor poster: string = '';

  @state()
  accessor duration: number = 0;

  @state()
  accessor thumbnailCaptured: boolean = false;

  @state()
  accessor isHovering: boolean = false;

  private thumbnailCanvas: HTMLCanvasElement | null = null;
  private hoverVideo: HTMLVideoElement | null = null;
  private hasStartedLoading: boolean = false;

  protected renderTileContent(): TemplateResult {
    return html`
      <div class="video-wrapper">
        ${this.poster ? html`
          <img class="poster-image" src="${this.poster}" alt="" />
        ` : this.thumbnailCaptured ? html`
          <canvas></canvas>
        ` : html`
          <div style="width: 100%; height: 100%; background: #000;"></div>
        `}

        ${this.isHovering && this.src ? html`
          <video
            class="video-hover-preview ${this.isHovering ? 'active' : ''}"
            .src=${this.src}
            muted
            playsinline
            @loadeddata=${this.handleHoverVideoLoaded}
          ></video>
        ` : ''}
      </div>

      ${this.duration > 0 ? html`
        <div class="duration-badge">${this.formatTime(this.duration)}</div>
      ` : ''}

      ${!this.isHovering ? html`
        <div class="play-overlay">
          <dees-icon icon="lucide:Play"></dees-icon>
        </div>
      ` : ''}

      ${this.clickable ? html`
        <div class="tile-overlay">
          <dees-icon icon="lucide:Play"></dees-icon>
          <span>Play Video</span>
        </div>
      ` : ''}
    `;
  }

  protected getTileClickDetail(): Record<string, unknown> {
    return {
      src: this.src,
      poster: this.poster,
      duration: this.duration,
    };
  }

  protected onBecameVisible(): void {
    if (!this.hasStartedLoading && this.src) {
      this.hasStartedLoading = true;
      this.captureFirstFrame();
    }
  }

  private async captureFirstFrame(): Promise<void> {
    if (this.poster) {
      // If poster is provided, just load duration
      this.loadDuration();
      return;
    }

    this.loading = true;

    try {
      const video = document.createElement('video');
      video.crossOrigin = 'anonymous';
      video.muted = true;
      video.preload = 'metadata';

      await new Promise<void>((resolve, reject) => {
        video.addEventListener('loadeddata', () => {
          this.duration = video.duration;

          // Capture the first frame
          video.currentTime = 0.1; // Slightly after start for better frame
          video.addEventListener('seeked', () => {
            const canvas = document.createElement('canvas');
            canvas.width = video.videoWidth;
            canvas.height = video.videoHeight;
            const ctx = canvas.getContext('2d');
            if (ctx) {
              ctx.drawImage(video, 0, 0);
              this.thumbnailCanvas = canvas;
              this.thumbnailCaptured = true;
            }

            // Clean up
            video.src = '';
            video.load();
            resolve();
          }, { once: true });
        }, { once: true });

        video.addEventListener('error', () => reject(new Error('Failed to load video')), { once: true });
        video.src = this.src;
      });

      this.loading = false;

      // Copy thumbnail to shadow DOM canvas
      await this.updateComplete;
      this.copyThumbnailToCanvas();
    } catch {
      this.loading = false;
      // Don't set error for thumbnail failure
      this.loadDuration();
    }
  }

  private loadDuration(): void {
    const video = document.createElement('video');
    video.preload = 'metadata';
    video.addEventListener('loadedmetadata', () => {
      this.duration = video.duration;
      video.src = '';
      video.load();
    });
    video.src = this.src;
  }

  private copyThumbnailToCanvas(): void {
    if (!this.thumbnailCanvas) return;
    const canvas = this.shadowRoot?.querySelector('.video-wrapper canvas') as HTMLCanvasElement;
    if (!canvas) return;

    canvas.width = this.thumbnailCanvas.width;
    canvas.height = this.thumbnailCanvas.height;
    const ctx = canvas.getContext('2d');
    if (ctx) {
      ctx.drawImage(this.thumbnailCanvas, 0, 0);
    }
  }

  protected onTileMouseEnter(): void {
    this.isHovering = true;
  }

  protected onTileMouseLeave(): void {
    this.isHovering = false;
    // The video element will be removed from DOM by the template
    this.hoverVideo = null;
  }

  private handleHoverVideoLoaded(e: Event): void {
    this.hoverVideo = e.target as HTMLVideoElement;
    this.hoverVideo.play().catch(() => {
      // Autoplay may be blocked
    });
  }

  public async updated(changedProperties: Map<PropertyKey, unknown>): Promise<void> {
    super.updated(changedProperties);
    if (changedProperties.has('src') && this.src && this.isVisible) {
      this.hasStartedLoading = true;
      this.thumbnailCaptured = false;
      this.duration = 0;
      this.captureFirstFrame();
    }
    if (changedProperties.has('thumbnailCaptured') && this.thumbnailCaptured) {
      await this.updateComplete;
      this.copyThumbnailToCanvas();
    }
  }

  public async disconnectedCallback(): Promise<void> {
    await super.disconnectedCallback();
    if (this.hoverVideo) {
      this.hoverVideo.pause();
      this.hoverVideo.src = '';
      this.hoverVideo = null;
    }
    this.thumbnailCanvas = null;
  }

  private formatTime(seconds: number): string {
    if (!isFinite(seconds) || seconds < 0) return '0:00';
    const mins = Math.floor(seconds / 60);
    const secs = Math.floor(seconds % 60);
    return `${mins}:${secs.toString().padStart(2, '0')}`;
  }
}