function isDiscordWebhook(url) {
  return /(^https?:\/\/)(ptb\.|canary\.)?(discord(app)?\.com)\/api\/webhooks\//i.test(String(url || ''));
}

function formatDurationShort(sec) {
  const s = Math.max(0, Math.round(Number(sec) || 0));
  const h = Math.floor(s / 3600);
  const m = Math.floor((s % 3600) / 60);
  const r = s % 60;
  if (h > 0) return `${h}h ${m}m`;
  if (m > 0) return `${m}m ${r}s`;
  return `${r}s`;
}

function summarizePerHosterFromBatch(summary) {
  const out = {};
  if (!summary || !Array.isArray(summary.files)) return out;
  for (const f of summary.files) {
    if (!f || !Array.isArray(f.results)) continue;
    for (const r of f.results) {
      if (!r || !r.hoster) continue;
      const b = out[r.hoster] || (out[r.hoster] = { ok: 0, fail: 0 });
      if (r.status === 'done') b.ok++;
      else b.fail++;
    }
  }
  return out;
}

function buildWebhookRequest(url, summary, meta) {
  const m = meta || {};
  const total = Number(summary && summary.total) || 0;
  const succeeded = Number(summary && summary.succeeded) || 0;
  const failed = Number(summary && summary.failed) || 0;
  const perHoster = summarizePerHosterFromBatch(summary);
  const duration = formatDurationShort(m.durationSec);

  let body;
  if (isDiscordWebhook(url)) {
    const hosterLines = Object.entries(perHoster)
      .map(([h, b]) => `${h}: ${b.ok}/${b.ok + b.fail}`)
      .join(' · ');
    const lines = [
      `**Multi-Hoster-Upload — Batch fertig**${m.machineName ? ` (${m.machineName})` : ''}`,
      `✅ ${succeeded} ok · ❌ ${failed} Fehler · 📦 ${total} gesamt · ⏱ ${duration}`
    ];
    if (hosterLines) lines.push(hosterLines);
    body = JSON.stringify({ content: lines.join('\n') });
  } else {
    body = JSON.stringify({
      event: 'batch-done',
      app: 'multi-hoster-upload',
      version: m.appVersion || null,
      machine: m.machineName || null,
      total,
      succeeded,
      failed,
      durationSec: Math.round(Number(m.durationSec) || 0),
      perHoster,
      timestamp: m.timestamp || null
    });
  }

  return {
    url: String(url),
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body
  };
}

module.exports = { isDiscordWebhook, formatDurationShort, summarizePerHosterFromBatch, buildWebhookRequest };