// Adds a Modrinth mod (and its required dependencies, recursively) to this packwiz pack.
//   node tools/add-mod.mjs <slug-or-id> [...]            → latest NeoForge 1.21.1 version
//   node tools/add-mod.mjs <slug>@<version_number>       → that exact version
// Writes mods/<slug>.pw.toml, then run: node tools/reindex.mjs
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';

const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
const UA = { 'User-Agent': 'Pinecraft-CreateRP/add-mod' };
const api = p => fetch('https://api.modrinth.com/v2' + p, { headers: UA }).then(r => {
  if (!r.ok) throw new Error(`${p}: HTTP ${r.status}`);
  return r.json();
});
const q = s => JSON.stringify(s);

const existing = new Set(fs.readdirSync(path.join(root, 'mods')).filter(f => f.endsWith('.pw.toml')).map(f => {
  const t = fs.readFileSync(path.join(root, 'mods', f), 'utf8');
  return (t.match(/^mod-id = "([^"]+)"/m) || [])[1];
}).filter(Boolean));

const sideOf = p => p.server_side === 'unsupported' ? 'client' : p.client_side === 'unsupported' ? 'server' : 'both';

async function add(spec, depth = 0) {
  const [ref, wanted] = spec.split('@');
  const project = await api(`/project/${ref}`);
  const pad = '  '.repeat(depth);
  if (existing.has(project.id)) { console.log(`${pad}= ${project.title} — already in the pack`); return; }
  const versions = await api(`/project/${project.id}/version?loaders=${encodeURIComponent('["neoforge"]')}&game_versions=${encodeURIComponent('["1.21.1"]')}`);
  const v = wanted ? versions.find(x => x.version_number === wanted) : versions[0];
  if (!v) throw new Error(`${project.title}: no NeoForge 1.21.1 version${wanted ? ' ' + wanted : ''}`);
  const f = v.files.find(x => x.primary) || v.files[0];
  const toml = [
    `name = ${q(project.title)}`, `filename = ${q(f.filename)}`, `side = ${q(sideOf(project))}`, '',
    '[download]', `url = ${q(f.url)}`, 'hash-format = "sha512"', `hash = ${q(f.hashes.sha512)}`, '',
    '[update]', '[update.modrinth]', `mod-id = ${q(project.id)}`, `version = ${q(v.id)}`, ''
  ].join('\n');
  fs.writeFileSync(path.join(root, 'mods', `${project.slug}.pw.toml`), toml);
  existing.add(project.id);
  console.log(`${pad}+ ${project.title} ${v.version_number} (${sideOf(project)})`);
  for (const d of v.dependencies.filter(d => d.dependency_type === 'required' && d.project_id)) {
    await add(d.project_id, depth + 1);
  }
}

for (const spec of process.argv.slice(2)) await add(spec);