#!/usr/bin/env node
/**
 * fetch-box-art.mjs
 * ---------------------------------------------------------------------------
 * Support tool for the Gaming Hall of Fame. Downloads box/banner art for a
 * game from the RAWG API (https://rawg.io/apidocs) and saves it into
 * `public/images/games/<slug>.jpg`, then prints the public path to paste into
 * a game file's `art:` field.
 *
 * RAWG covers Steam, PlayStation, Xbox, and Nintendo titles in one place, so
 * this works regardless of platform. Note: RAWG serves landscape banner /
 * screenshot art (not portrait Steam capsules), which matches the landscape
 * Hall of Fame cards (aspect-[4/3]).
 *
 * PREREQUISITES
 *   1. Get a free RAWG API key: https://rawg.io/login?forward=developer
 *   2. Put it in a `.env` file at the project root:
 *        RAWG_API_KEY=your_key_here
 *      (`.env` is gitignored; `.env.example` is the template.)
 *
 * USAGE
 *   node scripts/fetch-box-art.mjs "Elden Ring"
 *   node scripts/fetch-box-art.mjs "Hades" --platform pc
 *   node scripts/fetch-box-art.mjs "Celeste" --out celeste.jpg
 *   node scripts/fetch-box-art.mjs --id 3328                          # by RAWG id
 *
 * Run with `--env-file=.env` to auto-load the key (Node 20.6+):
 *   node --env-file=.env scripts/fetch-box-art.mjs "Elden Ring"
 *
 * If you don't use --env-file, export RAWG_API_KEY in your shell first.
 */
import { mkdir, writeFile } from 'node:fs/promises';
import { dirname, extname, join, resolve } from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = dirname(fileURLToPath(import.meta.url));
const PROJECT_ROOT = resolve(__dirname, '..');
const OUT_DIR = join(PROJECT_ROOT, 'public', 'images', 'games');

const RAWG_BASE = 'https://api.rawg.io/api';
// RAWG parent platforms that map to the --platform flag values.
const PLATFORM_IDS = {
  pc: 1,
  playstation: 2,
  xbox: 3,
  nintendo: 7,
  mac: 4,
  linux: 5,
  ios: 5,
  android: 6,
};

// --- arg parsing ------------------------------------------------------------
const args = process.argv.slice(2);
if (args.length === 0 || args.includes('-h') || args.includes('--help')) {
  console.log(`Usage: node scripts/fetch-box-art.mjs "<game title>" [options]

Options:
  --platform <p>   narrow search to a parent platform: pc, playstation, xbox, nintendo
  --id <rawgId>    fetch a specific game by its RAWG id (skips search)
  --out <name>     output filename (default: slug of the title, .jpg)
  -h, --help       show this help

Examples:
  node scripts/fetch-box-art.mjs "Elden Ring"
  node scripts/fetch-box-art.mjs "Hollow Knight" --platform pc
  node scripts/fetch-box-art.mjs --id 3328

Tip: run with \`node --env-file=.env scripts/fetch-box-art.mjs ...\` to auto-load
the RAWG_API_KEY from your .env file.`);
  process.exit(args.length === 0 ? 1 : 0);
}

const positional = [];
let platform = null;
let rawgId = null;
let outName = null;
for (let i = 0; i < args.length; i++) {
  const a = args[i];
  if (a === '--platform') platform = args[++i];
  else if (a === '--id') rawgId = Number(args[++i]);
  else if (a === '--out') outName = args[++i];
  else if (!a.startsWith('--')) positional.push(a);
}
const title = positional.join(' ').trim();

// --- helpers ----------------------------------------------------------------
const slugify = (s) =>
  s
    .toLowerCase()
    .replace(/['’.:]/g, '')
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-+|-+$/g, '');

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

const buildImageUrl = (game) => {
  // Prefer the wide/landscape screenshot-style image, which suits the
  // aspect-[4/3] Hall of Fame cards. Fall back through RAWG's image fields.
  const candidates = [
    game.background_image,
    game.background_image_additional,
  ];
  const url = candidates.find(Boolean);
  if (!url) return null;
  // RAWG serves http(s) images; force https.
  return url.replace(/^http:\/\//i, 'https://');
};

// --- main -------------------------------------------------------------------
const API_KEY = process.env.RAWG_API_KEY;
if (!API_KEY) {
  fail(
    'RAWG_API_KEY is not set. Add it to .env (see .env.example) and run with\n' +
      '  node --env-file=.env scripts/fetch-box-art.mjs "..."',
  );
}

let game;
try {
  if (rawgId) {
    console.log(`→ Fetching RAWG game id ${rawgId}…`);
    const res = await fetch(`${RAWG_BASE}/games/${rawgId}?key=${API_KEY}`);
    if (!res.ok) {
      if (res.status === 404) fail(`No RAWG game with id ${rawgId}.`);
      fail(`RAWG detail request failed: ${res.status} ${res.statusText}`);
    }
    game = await res.json();
  } else {
    if (!title) fail('No game title provided.');
    const params = new URLSearchParams({ key: API_KEY, search: title, page_size: '5' });
    if (platform) {
      const pid = PLATFORM_IDS[platform.toLowerCase()];
      if (!pid) {
        fail(
          `Unknown --platform "${platform}". Try one of: ${Object.keys(PLATFORM_IDS).join(', ')}`,
        );
      }
      params.set('parent_platforms', String(pid));
    }
    console.log(`→ Searching RAWG for "${title}"${platform ? ` on ${platform}` : ''}…`);
    const res = await fetch(`${RAWG_BASE}/games?${params}`);
    if (!res.ok) fail(`RAWG search failed: ${res.status} ${res.statusText}`);
    const data = await res.json();
    if (!data.results?.length) fail(`No RAWG results for "${title}".`);
    game = data.results[0];
    console.log(`  found: "${game.name}" (id ${game.id})${game.released ? `, ${game.released.slice(0, 4)}` : ''}`);
  }
} catch (err) {
  fail(err?.message ? `Network error: ${err.message}` : 'Network error contacting RAWG.');
}

const imageUrl = buildImageUrl(game);
if (!imageUrl) {
  fail(`RAWG has no usable image for "${game.name}". Try another title or --id.`);
}

// Decide output filename + extension (keep the source extension if --out omits one).
const baseName = outName ?? `${slugify(game.name)}.jpg`;
const ext = extname(baseName) || '.jpg';
const fileName = baseName.replace(/\.[^.]+$/, '') + ext;
const outPath = join(OUT_DIR, fileName);

console.log(`→ Downloading ${imageUrl}`);
const imgRes = await fetch(imageUrl);
if (!imgRes.ok) fail(`Image download failed: ${imgRes.status} ${imgRes.statusText}`);
const buf = Buffer.from(await imgRes.arrayBuffer());

await mkdir(OUT_DIR, { recursive: true });
await writeFile(outPath, buf);

const publicPath = `/images/games/${fileName}`;
console.log(`\n✔ Saved: ${outPath}`);
console.log(`  Use this in your game file's frontmatter:`);
console.log(`    art: "${publicPath}"`);