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

import { environment } from '../../environments/environment';
import { Program } from '../interfaces/program';

@Injectable({
  providedIn: 'root',
})
export class ProgramService {
  private http = inject(HttpClient);
  private baseUrl = `${environment.apiBaseUrl}/api/programs`;

  /** Fetch all programs, optionally filtered by day_of_week (1=Mon … 7=Sun). */
  getPrograms(day?: number): Observable<Program[]> {
    let params = new HttpParams();
    if (day !== undefined) params = params.set('day', String(day));
    return this.http.get<Program[]>(this.baseUrl, { params });
  }

  getProgram(id: number): Observable<Program> {
    return this.http.get<Program>(`${this.baseUrl}/${id}`);
  }

  createProgram(payload: Omit<Program, 'id'>): Observable<Program> {
    return this.http.post<Program>(this.baseUrl, payload);
  }

  updateProgram(id: number, payload: Partial<Program>): Observable<Program> {
    return this.http.put<Program>(`${this.baseUrl}/${id}`, payload);
  }

  deleteProgram(id: number): Observable<void> {
    return this.http.delete<void>(`${this.baseUrl}/${id}`);
  }
}