'use strict';

/**
 * opsNotify (Session 56) — pipeline alerting via ntfy.sh.
 *
 * Push a one-line operational alert (snapshot success / failure / stale / missed
 * cron) to an ntfy topic so a silent pipeline never goes unnoticed. Fire-and-
 * forget: NEVER throws, NEVER blocks the pipeline on a notify failure.
 *
 * Config:
 *   NTFY_URL    (default https://ntfy.sh)
 *   NTFY_TOPIC  (default vyndr-pipeline-kev2026)
 *   PIPELINE_ALERTS=0  → disable entirely
 * Disabled automatically under NODE_ENV==='test' unless a fetchImpl is injected
 * (so the unit tests can assert the call without hitting the network).
 */

const NTFY_URL = () => process.env.NTFY_URL || 'https://ntfy.sh';
const NTFY_TOPIC = () => process.env.NTFY_TOPIC || 'vyndr-pipeline-kev2026';

function enabled(opts = {}) {
  if (opts.fetchImpl) return true;               // tests inject → always "enabled"
  if (process.env.PIPELINE_ALERTS === '0') return false;
  if (process.env.NODE_ENV === 'test') return false;
  return true;
}

/**
 * Send an ops alert. `opts`: { title, priority ('min'|'low'|'default'|'high'|
 * 'urgent'), tags (string[]), fetchImpl }. Resolves { sent: boolean } — never rejects.
 */
async function notify(message, opts = {}) {
  if (!enabled(opts)) return { sent: false, reason: 'disabled' };
  const doFetch = opts.fetchImpl || fetch;
  const headers = {};
  if (opts.title) headers.Title = opts.title;
  if (opts.priority) headers.Priority = opts.priority;
  if (Array.isArray(opts.tags) && opts.tags.length) headers.Tags = opts.tags.join(',');
  try {
    await doFetch(`${NTFY_URL()}/${NTFY_TOPIC()}`, {
      method: 'POST',
      headers,
      body: String(message == null ? '' : message),
      signal: typeof AbortSignal !== 'undefined' && AbortSignal.timeout ? AbortSignal.timeout(6000) : undefined,
    });
    return { sent: true };
  } catch (err) {
    // Alerting must never break the pipeline.
    if (process.env.NODE_ENV !== 'test') console.warn('[opsNotify] failed:', err.message);
    return { sent: false, reason: err.message };
  }
}

module.exports = { notify, __internals: { enabled, NTFY_URL, NTFY_TOPIC } };