const API_BASE = import.meta.env.VITE_API_URL ?? "";

async function request<T>(path: string, init?: RequestInit): Promise<T> {
  const headers = new Headers(init?.headers);
  if (!(init?.body instanceof FormData) && !headers.has("Content-Type")) {
    headers.set("Content-Type", "application/json");
  }

  const response = await fetch(`${API_BASE}${path}`, {
    ...init,
    credentials: "include",
    headers
  });

  if (!response.ok) {
    const body = await response.json().catch(() => ({ error: "Request failed" }));
    throw new Error(body.error ?? "Request failed");
  }

  if (response.status === 204) {
    return undefined as T;
  }

  return response.json() as Promise<T>;
}

export const api = {
  get: <T>(path: string) => request<T>(path),
  post: <T>(path: string, body?: unknown) =>
    request<T>(path, {
      method: "POST",
      body: body instanceof FormData ? body : body ? JSON.stringify(body) : undefined
    }),
  put: <T>(path: string, body: unknown) =>
    request<T>(path, {
      method: "PUT",
      body: JSON.stringify(body)
    }),
  delete: <T>(path: string) =>
    request<T>(path, {
      method: "DELETE"
    })
};