export async function main(
  device: string = "オフィスの右エコー",
  prefix: string = "現在時刻は",
  suffix: string = "です"
) {
  const now = new Date();
  const hhmm = new Intl.DateTimeFormat("ja-JP", {
    timeZone: "Asia/Tokyo",
    hour: "2-digit",
    minute: "2-digit",
    hour12: false,
  }).format(now); // 例: 09:30

  const [h, m] = hhmm.split(":");
  const text = `${prefix}${Number(h)}時${Number(m)}分${suffix}`;

  const res = await fetch("http://alexa_api:3500/speak", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ device, text }),
  });

  if (!res.ok) {
    const body = await res.text();
    throw new Error(`alexa-api error ${res.status}: ${body}`);
  }

  return { ok: true, device, text };
}