import { API_BASE_URL } from '../constants/api';
import { ApiError } from '../types';

class ApiClient {
  private baseUrl: string;

  constructor(baseUrl: string) {
    this.baseUrl = baseUrl;
  }

  private async request<T>(
    endpoint: string,
    options: RequestInit = {}
  ): Promise<T> {
    const url = `${this.baseUrl}${endpoint}`;
    const response = await fetch(url, {
      ...options,
      headers: {
        'Content-Type': 'application/json',
        ...options.headers,
      },
    });

    if (!response.ok) {
      const error: ApiError = await response.json();
      throw new Error(error.error?.message || 'Request failed');
    }

    return response.json();
  }

  async get<T>(endpoint: string): Promise<T> {
    return this.request<T>(endpoint);
  }

  async post<T>(endpoint: string, body?: unknown): Promise<T> {
    return this.request<T>(endpoint, {
      method: 'POST',
      body: body ? JSON.stringify(body) : undefined,
    });
  }

  async delete<T>(endpoint: string): Promise<T> {
    return this.request<T>(endpoint, { method: 'DELETE' });
  }

  async uploadFile<T>(endpoint: string, formData: FormData): Promise<T> {
    const url = `${this.baseUrl}${endpoint}`;
    const response = await fetch(url, {
      method: 'POST',
      body: formData,
      headers: {
        'Content-Type': 'multipart/form-data',
      },
    });

    if (!response.ok) {
      const error: ApiError = await response.json();
      throw new Error(error.error?.message || 'Upload failed');
    }

    return response.json();
  }
}

export const apiClient = new ApiClient(API_BASE_URL);