async function request(path, options) {
  const response = await fetch(path, options);
  const body = await response.json().catch(() => ({}));
  if (!response.ok) {
    throw new Error(body.error || "Investigation persistence request failed");
  }
  return body;
}

export async function saveInvestigation(snapshot, id) {
  const body = await request("/api/investigations", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ id, snapshot }),
  });
  return body.snapshot ?? null;
}

export async function loadInvestigation(id) {
  const url = `/api/investigations/${encodeURIComponent(id)}`;
  const response = await fetch(url);
  if (!response.ok) {
    if (response.status === 404) return null;
    const body = await response.json().catch(() => ({}));
    throw new Error(body.error || "Investigation persistence request failed");
  }
  const body = await response.json();
  return body.snapshot ?? null;
}

export async function listInvestigations() {
  const body = await request("/api/investigations");
  return body.investigations ?? [];
}

export async function restartInvestigation(id) {
  const body = await request(`/api/investigations/${encodeURIComponent(id)}/restart`, {
    method: "POST",
  });
  return body.snapshot ?? null;
}