#!/usr/bin/env node
/**
 * fetch-bgg-covers.mjs
 * ---------------------------------------------------------------------------
 * Support tool for the Board games section on the TTRPGs page. For each game
 * in src/data/boardgames.json that is missing an `image`, it looks the game up
 * on the BoardGameGeek XML2 API (public, no key — just a User-Agent), and
 * either:
 *
 *   (default) downloads the cover to public/images/boardgames/<bggId>.jpg and
 *             writes the local public path back into the JSON, OR
 *   --remote   writes BGG's remote cover URL straight into the JSON (hotlinked;
 *               no download, but depends on BGG's CDN staying up).
 *
 * Idempotent: games that already have an `image` are skipped. Be gentle on BGG
 * — they rate-limit, so there's a small delay between requests.
 *
 * USAGE
 *   node scripts/fetch-bgg-covers.mjs                # download covers locally
 *   node scripts/fetch-bgg-covers.mjs --remote       # hotlink BGG URLs instead
 *   node scripts/fetch-bgg-covers.mjs --force        # re-fetch even if image set
 *   node scripts/fetch-bgg-covers.mjs --sleep 1500   # ms between BGG calls
 *   node scripts/fetch-bgg-covers.mjs --help
 *
 * Edit the list itself in src/data/boardgames.json:
 *   { "name": "Wingspan", "bggId": 266192 }
 * Find a game's bggId in its BoardGameGeek URL:
 *   https://boardgamegeek.com/boardgame/<bggId>/<slug>
 */
import { mkdir, readFile, writeFile } from 'node:fs/promises';
import { dirname, join, resolve } from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = dirname(fileURLToPath(import.meta.url));
const PROJECT_ROOT = resolve(__dirname, '..');
const DATA_FILE = join(PROJECT_ROOT, 'src', 'data', 'boardgames.json');
const OUT_DIR = join(PROJECT_ROOT, 'public', 'images', 'boardgames');
const BGG_API = 'https://boardgamegeek.com/xmlapi2';

// --- args -------------------------------------------------------------------
const args = process.argv.slice(2);
if (args.includes('-h') || args.includes('--help')) {
  console.log(`Usage: node scripts/fetch-bgg-covers.mjs [options]

Reads src/data/boardgames.json and fills in the "image" field for any game
missing one, using BoardGameGeek's public XML2 API (no key required).

Options:
  --remote       write BGG's remote cover URL into the JSON instead of downloading
  --force        re-fetch even for games that already have an image
  --sleep <ms>   delay between BGG API calls (default 1200; BGG rate-limits)
  -h, --help     show this help

Examples:
  node scripts/fetch-bgg-covers.mjs
  node scripts/fetch-bgg-covers.mjs --remote --sleep 2000`);
  process.exit(0);
}

const remoteMode = args.includes('--remote');
const force = args.includes('--force');
const sleepIdx = args.indexOf('--sleep');
const sleepMs = sleepIdx !== -1 ? Number(args[sleepIdx + 1]) || 1200 : 1200;

// --- helpers ----------------------------------------------------------------
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));

const fail = (msg, code = 1) => {
  console.error(`✖ ${msg}`);
  process.exit(code);
};

/** Extract text of the first <tagName> element from an XML string. */
const xmlText = (xml, tagName) => {
  const re = new RegExp(`<${tagName}[^>]*>([^<]*)</${tagName}>`, 'i');
  const m = xml.match(re);
  return m ? m[1].trim() : null;
};

// --- load data --------------------------------------------------------------
let games;
try {
  const raw = await readFile(DATA_FILE, 'utf8');
  games = JSON.parse(raw);
} catch (err) {
  if (err?.code === 'ENOENT') fail(`Could not read ${DATA_FILE}. Does it exist?`);
  fail(`Could not parse ${DATA_FILE}: ${err.message}`);
}
if (!Array.isArray(games)) fail(`${DATA_FILE} is not a JSON array.`);

console.log(
  `→ ${games.length} games in ${DATA_FILE.split(/[\\/]/).pop()}` +
    (remoteMode ? ' (remote mode: hotlink BGG URLs)' : ' (local mode: download covers)'),
);

// --- process each game ------------------------------------------------------
let changed = false;
const UA = 'GregKilmerProfileSite/1.0 (board-game-cover fetcher)';
await mkdir(OUT_DIR, { recursive: true });

for (let i = 0; i < games.length; i++) {
  const g = games[i];
  if (typeof g.bggId !== 'number') {
    console.warn(`  ! "${g.name}" has no bggId; skipping.`);
    continue;
  }
  if (g.image && !force) {
    console.log(`  ✓ ${g.name} — already has image, skipping.`);
    continue;
  }

  // BGG rate-limits; be polite between calls.
  if (i > 0) await sleep(sleepMs);

  const url = `${BGG_API}/thing?id=${g.bggId}&type=boardgame`;
  console.log(`→ [${i + 1}/${games.length}] ${g.name} (${url})`);
  let res;
  try {
    res = await fetch(url, { headers: { 'User-Agent': UA, Accept: 'application/xml' } });
  } catch (err) {
    console.warn(`  ! network error: ${err?.message ?? err}; skipping.`);
    continue;
  }
  if (res.status === 429) {
    console.warn('  ! rate-limited by BGG (429). Wait a bit and re-run; skipping rest.');
    break;
  }
  if (!res.ok) {
    console.warn(`  ! BGG returned ${res.status} ${res.statusText}; skipping.`);
    continue;
  }
  const xml = await res.text();
  const remoteImage = xmlText(xml, 'image'); // BGG's primary box-art URL
  if (!remoteImage) {
    console.warn(`  ! no <image> in BGG response for bggId ${g.bggId}; skipping.`);
    continue;
  }

  if (remoteMode) {
    g.image = remoteImage;
    changed = true;
    console.log(`  ✔ ${g.name} → ${remoteImage}`);
  } else {
    const ext = (remoteImage.match(/\.(jpe?g|png|webp)$/i)?.[1] ?? 'jpg').toLowerCase();
    const fileName = `${g.bggId}.${ext === 'jpeg' ? 'jpg' : ext}`;
    let buf;
    try {
      const imgRes = await fetch(remoteImage, { headers: { 'User-Agent': UA } });
      if (!imgRes.ok) throw new Error(`${imgRes.status} ${imgRes.statusText}`);
      buf = Buffer.from(await imgRes.arrayBuffer());
    } catch (err) {
      console.warn(`  ! image download failed (${err?.message ?? err}); skipping.`);
      continue;
    }
    await writeFile(join(OUT_DIR, fileName), buf);
    g.image = `/images/boardgames/${fileName}`;
    changed = true;
    console.log(`  ✔ ${g.name} → ${g.image}`);
  }
}

// --- write back -------------------------------------------------------------
if (changed) {
  await writeFile(DATA_FILE, JSON.stringify(games, null, 2) + '\n', 'utf8');
  console.log(`\n✔ Updated ${DATA_FILE}`);
} else {
  console.log('\n— Nothing to update (all games already had an image).');
}