import { Injectable, inject } from '@angular/core';
import { HttpClient, HttpParams } from '@angular/common/http';
import { Observable } from 'rxjs';

export interface LikedVideoItem {
  provider: string;
  video_id: string;
  title?: string;
  thumbnail?: string;
  last_watched_at?: string | null;
}

@Injectable({ providedIn: 'root' })
export class LikesService {
  private http = inject(HttpClient);

  private apiBase(): string {
    try {
      const port = window?.location?.port || '';
      return port && port !== '4000' ? '/proxy/api' : '/api';
    } catch {
      return '/api';
    }
  }

  list(limit = 100, q?: string): Observable<LikedVideoItem[]> {
    let params = new HttpParams().set('limit', String(limit));
    if (typeof q === 'string' && q.trim().length > 0) params = params.set('q', q.trim());
    return this.http.get<LikedVideoItem[]>(`${this.apiBase()}/user/likes`, { params, withCredentials: true });
  }

  like(provider: string, videoId: string): Observable<{ provider: string; video_id: string }> {
    return this.http.post<{ provider: string; video_id: string }>(
      `${this.apiBase()}/user/likes`,
      { provider, videoId },
      { withCredentials: true }
    );
  }

  unlike(provider: string, videoId: string): Observable<{ removed: boolean }> {
    const params = new HttpParams().set('provider', provider).set('videoId', videoId);
    return this.http.delete<{ removed: boolean }>(`${this.apiBase()}/user/likes`, { params, withCredentials: true });
  }

  isLiked(provider: string, videoId: string): Observable<{ liked: boolean }> {
    const params = new HttpParams().set('provider', provider).set('videoId', videoId);
    return this.http.get<{ liked: boolean }>(`${this.apiBase()}/user/likes/status`, { params, withCredentials: true });
  }
}