export class FetchError extends Error {
  status: number;
  info: unknown;
  constructor(message: string, status: number, info: unknown) {
    super(message);
    this.name = "FetchError";
    this.status = status;
    this.info = info;
  }
}

export async function fetcher<T>(url: string): Promise<T> {
  const res = await fetch(url);
  if (!res.ok) {
    let info: unknown = null;
    try {
      info = await res.json();
    } catch {
      try {
        info = await res.text();
      } catch {
        info = null;
      }
    }
    const msg =
      (info as { error?: string })?.error ||
      (typeof info === "string" ? info : null) ||
      `Request failed: ${res.status} ${res.statusText}`;
    throw new FetchError(msg, res.status, info);
  }
  return (await res.json()) as T;
}