const API_BASE_URL = import.meta.env.VITE_API_URL || '';

export class ApiError extends Error {
  status: number;

  constructor(status: number, message: string) {
    super(message);
    this.name = 'ApiError';
    this.status = status;
  }
}

export async function apiRequest<T>(
  endpoint: string,
  options: RequestInit = {},
): Promise<T> {
  const url = `${API_BASE_URL}${endpoint}`;

  const response = await fetch(url, {
    ...options,
    headers: {
      'Content-Type': 'application/json',
      ...options.headers,
    },
  });

  if (!response.ok) {
    const message = await response.text().catch(() => 'Request failed');
    throw new ApiError(response.status, message);
  }

  return response.json();
}

export function buildQueryString(
  params: Record<string, string | number | boolean | undefined>,
): string {
  const filtered = Object.entries(params).filter(
    ([, value]) => value !== undefined,
  );
  if (filtered.length === 0) return '';
  return '?' + new URLSearchParams(
    filtered.map(([key, value]) => [key, String(value)]),
  ).toString();
}