require('dotenv').config();
const pool = require('../server/db');

async function main() {
  const { rows } = await pool.query(`
    WITH dups AS (
      SELECT artist_id, title, year, array_agg(id ORDER BY id) AS ids
      FROM paintings
      GROUP BY artist_id, title, year
      HAVING COUNT(*) > 1
    ),
    expanded AS (
      SELECT artist_id, title, year, ids[1] AS keep_id, unnest(ids[2:]) AS drop_id
      FROM dups
    )
    SELECT e.drop_id,
           (SELECT COUNT(*) FROM painting_influences pi
            WHERE pi.painting_id = e.drop_id OR pi.influenced_by_painting_id = e.drop_id) AS legacy_links,
           (SELECT COUNT(*) FROM painting_influence_sources pis
            WHERE pis.painting_id = e.drop_id OR pis.source_painting_id = e.drop_id) AS source_links
    FROM expanded e
    ORDER BY e.drop_id
  `);

  const withLinks = rows.filter((r) => Number(r.legacy_links) + Number(r.source_links) > 0);
  console.log(`Exact-duplicate drop candidates: ${rows.length}`);
  console.log(`With influence links (need merge before delete): ${withLinks.length}`);
  if (withLinks.length) console.table(withLinks);

  await pool.end();
}

main().catch((err) => {
  console.error(err);
  process.exit(1);
});