import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { firstValueFrom } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class HttpService {
  public constructor(private httpClient: HttpClient) { }

  public async get<T>(url: string): Promise<T> {
    return this.request<T>(url, 'get');
  }

  public async post<T>(url: string, body?: any): Promise<T> {
    return this.request<T>(url, 'post', body);
  }

  public async put<T>(url: string, body?: any): Promise<T> {
    return this.request<T>(url, 'put', body);
  }

  public async delete<T>(url: string): Promise<T> {
    return this.request<T>(url, 'delete');
  }

  private async request<T>(url: string, method: 'get' | 'post' | 'put' | 'delete', body?: any): Promise<T> {
    const headers = { 'Accept': 'application/json', 'Content-Type': 'application/json' };
    switch (method) {
      case 'post':
        return firstValueFrom(this.httpClient.post<T>(url, body, { headers }));
      case 'put':
        return firstValueFrom(this.httpClient.put<T>(url, body, { headers }));
      case 'delete':
        return firstValueFrom(this.httpClient.delete<T>(url, { headers }));
      default:
        return firstValueFrom(this.httpClient.get<T>(url, { headers }));
    }
  }
}