#!/usr/bin/env node

import { readFile } from 'node:fs/promises';

const inputPath = process.argv[2];
const source = inputPath ? await readFile(inputPath, 'utf8') : await new Promise((resolve, reject) => {
  let value = '';
  process.stdin.setEncoding('utf8');
  process.stdin.on('data', (chunk) => { value += chunk; });
  process.stdin.on('end', () => resolve(value));
  process.stdin.on('error', reject);
});

const payload = JSON.parse(source);
if (!Array.isArray(payload.listings)) {
  throw new Error('Expected an object with a listings array');
}

const listings = payload.listings.map((listing) => {
  const itemUrl = String(listing.item_url || '');
  const canonicalUrl = itemUrl ? itemUrl.split('?')[0] : null;
  const itemId = listing.item_id || canonicalUrl?.match(/\/itm\/(\d+)/)?.[1] || null;
  return { ...listing, item_id: itemId, item_url: canonicalUrl };
});

process.stdout.write(`${JSON.stringify({ ...payload, listings }, null, 2)}\n`);