const PUSHOVER_URL = 'https://api.pushover.net/1/messages.json';

const toNumber = (value, fallback) => {
  const parsed = Number(value);
  return Number.isFinite(parsed) ? parsed : fallback;
};

export async function sendPushoverMessage(config, message) {
  const userKey = String(config?.pushover?.userKey || '').trim();
  const apiToken = String(config?.pushover?.apiToken || '').trim();

  if (!userKey || !apiToken) {
    throw new Error('Pushover requires userKey and apiToken.');
  }

  const body = new URLSearchParams({
    token: apiToken,
    user: userKey,
    title: String(message?.title || 'Vault Alert'),
    message: String(message?.message || ''),
    priority: String(toNumber(message?.priority, 0))
  });

  if (message?.url) {
    body.set('url', String(message.url));
  }
  if (message?.urlTitle) {
    body.set('url_title', String(message.urlTitle));
  }
  if (message?.sound) {
    body.set('sound', String(message.sound));
  }

  const response = await fetch(PUSHOVER_URL, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded'
    },
    body
  });

  if (!response.ok) {
    const text = await response.text().catch(() => '');
    throw new Error(`Pushover error (${response.status}): ${text || 'request failed'}`);
  }

  return response.json().catch(() => ({ ok: true }));
}