// /home/def/IPFSapp/backend/expire.js
// Unpins CIDs whose payments.expires_at < now(); marks status='expired'.
// Uses the same .env as server.js (dotenv).

import 'dotenv/config';
import { Pool } from 'pg';

const {
  DATABASE_URL,
  IPFS_API = 'http://127.0.0.1:5001/api/v0'
} = process.env;

if (!DATABASE_URL) {
  console.error('Missing DATABASE_URL');
  process.exit(1);
}

const pool = new Pool({ connectionString: DATABASE_URL });
const sql = (q, p=[]) => pool.query(q, p);

const nowIso = () => new Date().toISOString();

async function fetchJSON(url, opts = {}) {
  const r = await fetch(url, opts);
  if (!r.ok) throw new Error(`${url} → ${r.status}`);
  try { return await r.json(); } catch { return {}; }
}

async function unpinCid(cid) {
  // POST /api/v0/pin/rm?arg=<cid>&recursive=true
  const url = `${IPFS_API}/pin/rm?arg=${encodeURIComponent(cid)}&recursive=true`;
  await fetchJSON(url, { method: 'POST' });
}

async function gcRepo() {
  // Trigger a GC pass (optional; Kubo also GC’s with --enable-gc)
  try { await fetchJSON(`${IPFS_API}/repo/gc`, { method: 'POST' }); } catch {}
}

async function run() {
  console.log(`[expirer] start ${nowIso()}`);

  // pick up items with expired retention that are still considered kept
  const { rows } = await sql(`
    SELECT quote_id, cid
    FROM payments
    WHERE cid IS NOT NULL
      AND expires_at IS NOT NULL
      AND expires_at < now()
      AND status IN ('paid','confirmed')
    ORDER BY expires_at ASC
    LIMIT 500
  `);

  if (!rows.length) {
    console.log('[expirer] nothing to expire');
    process.exit(0);
  }

  let ok = 0, fail = 0;
  for (const r of rows) {
    try {
      await unpinCid(r.cid);
      await sql(`UPDATE payments SET status='expired' WHERE quote_id=$1`, [r.quote_id]);
      console.log(`[expirer] expired ${r.cid} (quote ${r.quote_id})`);
      ok++;
    } catch (e) {
      console.error(`[expirer] failed ${r.cid}: ${e.message || e}`);
      fail++;
    }
  }

  await gcRepo();

  console.log(`[expirer] done ok=${ok} fail=${fail} ${nowIso()}`);
  process.exit(0);
}

run().catch(e => {
  console.error('[expirer] fatal', e);
  process.exit(1);
});