const API_BASE_URL = process.env.REACT_APP_API_URL || '/api';

export const getAuthToken = (): string | null => {
  return localStorage.getItem('admin_token');
};

export const setAuthToken = (token: string): void => {
  localStorage.setItem('admin_token', token);
};

export const removeAuthToken = (): void => {
  localStorage.removeItem('admin_token');
};

export const fetchApi = async (endpoint: string, options: RequestInit = {}) => {
  const token = getAuthToken();
  const headers: Record<string, string> = {
    'Content-Type': 'application/json',
    ...(options.headers as Record<string, string> || {}),
  };

  if (token) {
    headers['Authorization'] = `Bearer ${token}`;
  }

  const response = await fetch(`${API_BASE_URL}${endpoint}`, {
    ...options,
    headers,
  });

  if (!response.ok) {
    const errorData = await response.json().catch(() => ({}));
    throw new Error(errorData.error || `HTTP error! status: ${response.status}`);
  }

  return response.json();
};

export const uploadFile = async (file: File) => {
  const token = getAuthToken();
  const formData = new FormData();
  formData.append('file', file);

  const response = await fetch(`${API_BASE_URL}/upload`, {
    method: 'POST',
    headers: {
      'Authorization': token ? `Bearer ${token}` : '',
    },
    body: formData,
  });

  if (!response.ok) {
    const errorData = await response.json().catch(() => ({}));
    throw new Error(errorData.error || 'Upload failed');
  }

  return response.json();
};