import { DatabaseSync } from 'node:sqlite';
import { parentPort, workerData } from 'node:worker_threads';
import { isDeepStrictEqual } from 'node:util';

const db = new DatabaseSync(workerData.marketFile);
db.exec('PRAGMA busy_timeout=5000; PRAGMA synchronous=FULL;');
const port = parentPort;
if (!port) throw new Error('Reconciliation commit worker requires a parent port');

function atomic(fn) {
  db.exec('BEGIN IMMEDIATE');
  try { const result = fn(); db.exec('COMMIT'); return result; }
  catch (error) { db.exec('ROLLBACK'); throw error; }
}
function assertCurrentJob(expected) {
  const row = db.prepare("SELECT value FROM market_meta WHERE key='canonical_reconciliation_job'").get();
  if (!row || !isDeepStrictEqual(JSON.parse(row.value), expected)) {
    throw new Error('Reconciliation job changed before worker commit');
  }
}

port.on('message', request => {
  try {
    if (request.operation === 'persist-batch') {
      atomic(() => {
        assertCurrentJob(request.expectedJob);
        const order = db.prepare(`INSERT INTO orders(id,data) VALUES(?,?)
          ON CONFLICT(id) DO UPDATE SET data=excluded.data WHERE orders.data<>excluded.data`);
        for (const row of request.orders) order.run(row.id, row.data);
        const listing = db.prepare(`INSERT INTO listings(id,card,status,data) VALUES(?,?,?,?)
          ON CONFLICT(id) DO UPDATE SET status=excluded.status,data=excluded.data WHERE listings.data<>excluded.data`);
        for (const row of request.listings) listing.run(row.id, row.card, row.status, row.data);
        db.prepare("UPDATE market_meta SET value=? WHERE key='canonical_reconciliation_job'")
          .run(JSON.stringify(request.nextJob));
      });
    } else {
      atomic(() => {
        assertCurrentJob(request.expectedJob);
        db.prepare('DELETE FROM receipts WHERE expires < ?').run(request.observedAt - 86400_000);
        if (request.cursor) {
          db.prepare(`INSERT INTO market_meta(key,value) VALUES('canonical_event_cursor',?)
            ON CONFLICT(key) DO UPDATE SET value=excluded.value`).run(request.cursor);
        }
        db.prepare("DELETE FROM market_meta WHERE key='canonical_reconciliation_job'").run();
      });
    }
    port.postMessage({ id: request.id, ok: true });
  } catch (error) {
    port.postMessage({ id: request.id, ok: false, error: error instanceof Error ? error.message : 'Worker batch failed' });
  }
});
port.on('close', () => db.close());