// Thin fetch wrapper for the podsteadr API (session cookie auth).

export class ApiError extends Error {
  constructor(public status: number, message: string) {
    super(message);
  }
}

async function request<T>(method: string, path: string, body?: unknown, headers?: Record<string, string>): Promise<T> {
  const res = await fetch(path, {
    method,
    credentials: 'same-origin',
    headers: {
      ...(body !== undefined ? { 'content-type': 'application/json' } : {}),
      ...headers,
    },
    body: body !== undefined ? JSON.stringify(body) : undefined,
  });
  if (!res.ok) {
    let message = res.statusText;
    try {
      message = ((await res.json()) as { error?: string }).error ?? message;
    } catch {
      /* keep statusText */
    }
    throw new ApiError(res.status, message);
  }
  return (await res.json()) as T;
}

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