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

export interface ImageRecord {
  id: string;
  hash: string;
  filename: string;
  mime_type: string;
  size_bytes: number;
  width: number;
  height: number;
  storage_key: string;
  thumbnail_key: string | null;
  created_at: string;
  tags: string[];
  duplicate?: boolean;
}

export interface ImageListResponse {
  items: ImageRecord[];
  total: number;
  limit: number;
  offset: number;
}

@Injectable({ providedIn: 'root' })
export class ImageService {
  private readonly base = '/api/v1';

  constructor(private http: HttpClient) {}

  upload(file: File, tags: string[]): Observable<ImageRecord> {
    const form = new FormData();
    form.append('file', file);
    if (tags.length) {
      form.append('tags', tags.join(','));
    }
    return this.http.post<ImageRecord>(`${this.base}/images`, form);
  }

  list(tagFilter: string[] = [], limit = 50, offset = 0): Observable<ImageListResponse> {
    let params = new HttpParams().set('limit', limit).set('offset', offset);
    if (tagFilter.length) {
      params = params.set('tags', tagFilter.join(','));
    }
    return this.http.get<ImageListResponse>(`${this.base}/images`, { params });
  }

  get(id: string): Observable<ImageRecord> {
    return this.http.get<ImageRecord>(`${this.base}/images/${id}`);
  }

  getFileUrl(id: string): string {
    return `${this.base}/images/${id}/file`;
  }

  getThumbnailUrl(id: string): string {
    return `${this.base}/images/${id}/thumbnail`;
  }

  updateTags(id: string, tags: string[]): Observable<ImageRecord> {
    return this.http.patch<ImageRecord>(`${this.base}/images/${id}/tags`, { tags });
  }

  delete(id: string): Observable<void> {
    return this.http.delete<void>(`${this.base}/images/${id}`);
  }
}