const BASE_URL = 'http://localhost:5000';

async function request<T>(method: string, path: string, body?: unknown): Promise<T> {
  const headers: Record<string, string> = { 'Content-Type': 'application/json' };

  const res = await fetch(`${BASE_URL}${path}`, {
    method,
    headers,
    body: body ? JSON.stringify(body) : undefined,
  });

  if (!res.ok) {
    const text = await res.text();
    throw new Error(text || `HTTP ${res.status}`);
  }

  const json = await res.json();
  if (json.code !== 0) {
    throw new Error(json.message || `Error code ${json.code}`);
  }
  return json.data as T;
}

export const api = {
  get: <T>(path: string) => request<T>('GET', path),
  post: <T>(path: string, body?: unknown) => request<T>('POST', path, body),
  put: <T>(path: string, body?: unknown) => request<T>('PUT', path, body),
  del: <T>(path: string) => request<T>('DELETE', path),
};