/**
 * The popup's wording, kept apart from its DOM so the specs can load it
 * (test/popup-format.spec.js). Classic script, like the rest of lib/.
 */

/**
 * One line of state for a source row, from /api/sources' fields, with the
 * status class the popup colours it by ('ready' | 'error' | 'no-cookies' for
 * a warning | '' for plain). The most actionable fact wins: an error before
 * a running backfill, a backfill before the last-checked time.
 */
function sourceStatus(src, now = Date.now()) {
  if (!src.enabled) return { text: 'Disabled', kind: '' };
  if (src.last_error) {
    const first = String(src.last_error).split('\n')[0].trim();
    const short = first.length > 90 ? `${first.slice(0, 89)}…` : first;
    return { text: `Error — ${short}`, kind: 'error' };
  }
  if (src.backfill_state === 'running') {
    const n = src.backfill_chunks || 0;
    return { text: n ? `Backfilling — ${n} chunk${n === 1 ? '' : 's'} done` : 'Backfill queued', kind: 'ready' };
  }
  if (src.backfill_state === 'stalled') return { text: 'Backfill stalled', kind: 'no-cookies' };
  if (!src.last_checked_at) return { text: 'Not checked yet', kind: '' };
  return { text: `Checked ${relativeTime(src.last_checked_at, now)}`, kind: '' };
}

// Same buckets and wording as the web UI's canonical formatRelative
// (frontend/src/utils/date.js, snippet #3959) — the extension can't import it (classic
// scripts, separate package), so it mirrors it: "42s ago", "5m ago", "3h ago",
// "2d ago", and "Never" for a missing or unreadable time.
function relativeTime(iso, now = Date.now()) {
  const t = iso ? Date.parse(iso) : NaN;
  if (Number.isNaN(t)) return 'Never';
  const abs = Math.abs(now - t) / 1000;
  let body;
  if (abs < 60) body = `${Math.floor(abs)}s`;
  else if (abs < 3600) body = `${Math.floor(abs / 60)}m`;
  else if (abs < 86400) body = `${Math.floor(abs / 3600)}h`;
  else body = `${Math.floor(abs / 86400)}d`;
  return `${body} ago`;
}

/**
 * The popup message after a Discord token export, from FC's verify of the
 * stored token: {text, kind} with kind 'success' | 'warning' | 'error'.
 * valid=null is "FC couldn't test it" (no Discord source yet, or a network
 * hiccup) — a warning with FC's reason, never a failure.
 */
function tokenExportMessage(verify) {
  if (!verify) return { text: 'Discord: token exported', kind: 'success' };
  if (verify.valid === true) return { text: `Discord: token exported and verified ✓ — ${verify.reason}`, kind: 'success' };
  if (verify.valid === false) return { text: `Discord: token exported, but FC's check failed — ${verify.reason}`, kind: 'error' };
  return { text: `Discord: token exported (not verified — ${verify.reason})`, kind: 'warning' };
}