// ── Rehearser library persistence ────────────────────────────────────────────
// SQLite-backed rehearsal records and the one-time IndexedDB migration are
// isolated from parsing, casting, and stage playback. Functions stay global
// during the compatibility migration because audiobook.js/library.js call them.

async function rehDbGetAll() {
  const r = await fetch('/api/rehearsals');
  if (!r.ok) throw new Error('rehDbGetAll failed: ' + r.status);
  const d = await r.json();
  return d.rehearsals || [];
}
async function rehDbGetById(id) {
  const r = await fetch('/api/rehearsals/' + id);
  if (r.status === 404) return undefined;
  if (!r.ok) throw new Error('rehDbGetById failed: ' + r.status);
  return r.json();
}
async function rehDbAdd(record) {
  const r = await fetch('/api/rehearsals', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(_rehSanitize(record)) });
  if (!r.ok) throw new Error('rehDbAdd failed: ' + r.status);
  return (await r.json()).id;
}
async function rehDbPut(record) {
  if (!record.id) return rehDbAdd(record);
  const r = await fetch('/api/rehearsals/' + record.id, { method: 'PUT', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(_rehSanitize(record)) });
  if (!r.ok) throw new Error('rehDbPut failed: ' + r.status);
}
async function rehDbDelete(id) {
  const r = await fetch('/api/rehearsals/' + id, { method: 'DELETE' });
  if (!r.ok) throw new Error('rehDbDelete failed: ' + r.status);
}
function _rehSanitize(rec) {
  const out = { ...rec };
  if (out.clips) out.clips = (out.clips || []).map(c => ({ lineIndex: c.lineIndex, speaker: c.speaker, type: c.type }));
  return out;
}
function _rehIdbGetAll() {
  return new Promise(resolve => {
    const req = indexedDB.open('reh-library', 1);
    req.onerror = () => resolve([]);
    req.onsuccess = e => {
      const db = e.target.result;
      if (!db.objectStoreNames.contains('rehearsals')) { db.close(); resolve([]); return; }
      const all = db.transaction('rehearsals', 'readonly').objectStore('rehearsals').getAll();
      all.onsuccess = ev => { db.close(); resolve(ev.target.result || []); };
      all.onerror = () => { db.close(); resolve([]); };
    };
  });
}
(async function _rehMigrateIfNeeded() {
  try {
    if ((await rehDbGetAll()).length) return;
    const old = await _rehIdbGetAll();
    if (!old.length) return;
    const r = await fetch('/api/rehearsals/migrate', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(old.map(_rehSanitize)) });
    if (r.ok) console.log(`[rehearser] migrated ${(await r.json()).imported} records from IndexedDB → SQLite`);
  } catch (e) { console.warn('[rehearser] migration skipped:', e); }
})();
window.rehDbGetById = rehDbGetById;