/**
 * reconcile-device-links.ts
 *
 * Walks `device_external_ids` rows where `configuration_item_id IS NULL` and
 * tries to link each to a configuration_item via cascading match strategies
 * (serial → MAC → hostname-in-company). Conflicts (multiple CIs match) are
 * logged and skipped — no auto-merge.
 *
 * Usage:
 *   npx tsx scripts/reconcile-device-links.ts --dry-run
 *   npx tsx scripts/reconcile-device-links.ts --dry-run --limit=10000
 *   npx tsx scripts/reconcile-device-links.ts --limit=5000
 */

import { config } from 'dotenv';
config({ path: '.env.local' });

import { reconcileUnlinkedDevices } from '@/lib/services/device-link-reconciler';

function parseArgs() {
  const args = process.argv.slice(2);
  const dryRun = args.includes('--dry-run');
  const limitArg = args.find((a) => a.startsWith('--limit='));
  const limit = limitArg ? parseInt(limitArg.split('=')[1], 10) : 5000;
  return { dryRun, limit };
}

async function main() {
  const { dryRun, limit } = parseArgs();
  console.log(
    `[reconcile-device-links] starting${dryRun ? ' (DRY RUN — no writes)' : ''}; limit=${limit}`
  );
  const start = Date.now();
  const result = await reconcileUnlinkedDevices({ limit, dryRun });
  const elapsed = ((Date.now() - start) / 1000).toFixed(1);

  console.log('');
  console.log(`scanned:    ${result.scanned}`);
  console.log(`linked:     ${result.linked}${dryRun ? '  (would link)' : ''}`);
  console.log(`conflicts:  ${result.conflicts}  (multiple CIs matched — skipped)`);
  console.log(`unmatched:  ${result.unmatched}`);
  console.log('');
  console.log('by confidence:');
  for (const [k, v] of Object.entries(result.byConfidence)) {
    if (v > 0) console.log(`  ${k.padEnd(22)} ${v}`);
  }
  console.log('');
  console.log(`done in ${elapsed}s`);

  // pg pool keeps the process alive otherwise.
  process.exit(0);
}

main().catch((err) => {
  console.error('[reconcile-device-links] fatal:', err);
  process.exit(1);
});