#!/usr/bin/env node
'use strict';
// Read-only CLI. Never writes the reader's discovery.json or scraper queue.
const fs = require('node:fs');
const path = require('node:path');
const { loadCatalog } = require('../greatest');
const { generate } = require('./engine');

if (!process.argv.includes('--dry-run')) {
  console.error('Usage: node discovery/cli.js run --dry-run [--data DIR] [--catalog FILE] [--show]');
  process.exit(2);
}
const arg = (name, fallback) => { const i = process.argv.indexOf(name); return i < 0 ? fallback : process.argv[i + 1]; };
const data = path.resolve(arg('--data', process.env.DATA || 'data'));
const db = JSON.parse(fs.readFileSync(path.join(data, 'db.json'), 'utf8'));
let library = [];
try { library = JSON.parse(fs.readFileSync(path.join(data, 'library-index.json'), 'utf8')).mangas || []; }
catch (error) { if (error.code !== 'ENOENT') throw error; }
const greatest = loadCatalog(arg('--catalog', path.join(__dirname, '..', 'greatest', 'catalog.json')));
const result = generate({ db, library, greatest, cacheDir: path.join(data, 'scraper', 'metadata', 'anilist') });
const summary = { examined: result.examined, candidates: Object.keys(result.candidates).length,
  optedInUsers: Object.values(db.users || {}).filter(u => u.settings?.discoveryEnabled).length,
  feedSizes: Object.values(result.feeds).filter(f => !f.disabled).map(f => f.items.length) };
if (process.argv.includes('--show')) summary.titles = Object.values(result.feeds).find(f => !f.disabled)?.items
  .map(item => result.candidates[item.candidateId]?.title) || [];
console.log(JSON.stringify(summary, null, 2));