const safeStringify = (value: unknown, space: number): string => {
  try {
    return JSON.stringify(value, null, space);
  } catch {
    const seen = new WeakSet();
    return JSON.stringify(
      value,
      (_key, val) => {
        if (typeof val === "bigint") return val.toString();
        if (typeof val === "object" && val !== null) {
          if (seen.has(val)) return "[Circular]";
          seen.add(val);
        }
        return val;
      },
      space
    );
  }
};

export const downloadAsJson = (data: unknown, filename: string) => {
  const json = safeStringify(data, 2);
  const blob = new Blob([json], { type: "application/json" });
  const url = URL.createObjectURL(blob);
  const a = document.createElement("a");
  a.href = url;
  a.download = filename.endsWith(".json") ? filename : `${filename}.json`;
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
  setTimeout(() => URL.revokeObjectURL(url), 0);
};