// API Configuration
// Use relative URLs by default so it works with any domain/reverse proxy
export const API_BASE_URL = (import.meta as any).env.VITE_API_URL || '';

// API Error class
export class ApiError extends Error {
  constructor(
    message: string,
    public status?: number,
    public code?: string,
    public details?: unknown
  ) {
    super(message);
    this.name = 'ApiError';
  }
}

// Helper function for API calls with error handling
export const apiCall = async (endpoint: string, options?: RequestInit) => {
  const url = endpoint.startsWith('/') ? `${API_BASE_URL}${endpoint}` : endpoint;
  
  // Get auth token from localStorage
  const authToken = localStorage.getItem('authToken');
  
  // Build headers
  const headers: HeadersInit = {
    'Content-Type': 'application/json',
    ...options?.headers,
  };
  
  // Add authorization header if token exists
  if (authToken) {
    headers['Authorization'] = `Bearer ${authToken}`;
  }
  
  try {
    const response = await fetch(url, {
      ...options,
      headers,
    });

    // Handle non-2xx responses
    if (!response.ok) {
      let errorData;
      try {
        errorData = await response.json();
      } catch {
        errorData = { error: { message: response.statusText } };
      }

      throw new ApiError(
        errorData.error?.message || `Request failed with status ${response.status}`,
        response.status,
        errorData.error?.code,
        errorData.error?.details
      );
    }

    // Try to parse JSON response
    const contentType = response.headers.get('content-type');
    if (contentType && contentType.includes('application/json')) {
      const data = await response.json();
      return { response, data };
    }

    return { response, data: null };
  } catch (error) {
    // Network errors or other issues
    if (error instanceof ApiError) {
      throw error;
    }
    
    throw new ApiError(
      error instanceof Error ? error.message : 'Network request failed',
      undefined,
      'NETWORK_ERROR'
    );
  }
};