#!/usr/bin/env node
/**
 * Optimiert alle Falukant-Charakter-GLBs mit Draco + Textur-Optimierung.
 * Ausgabe: *_opt.glb im selben Verzeichnis.
 * Voraussetzung: npm install (@gltf-transform/cli als Dev-Dep)
 *
 * Aufruf: npm run optimize-models
 */

import fs from 'fs';
import { spawnSync } from 'child_process';
import { fileURLToPath } from 'url';
import path from 'path';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const sourceDir = path.join(__dirname, '..', 'models-src', '3d', 'falukant', 'characters');
const outputDir = path.join(__dirname, '..', 'public', 'models', '3d', 'falukant', 'characters');
const cli = path.join(__dirname, '..', 'node_modules', '.bin', 'gltf-transform');

function listSourceModels() {
  return fs.readdirSync(sourceDir)
    .filter((file) => file.endsWith('.glb'))
    .filter((file) => !file.endsWith('_opt.glb'))
    .sort((a, b) => a.localeCompare(b));
}

function ensureOutputDir() {
  fs.mkdirSync(outputDir, { recursive: true });
}

function removeStaleOptimizedModels() {
  if (!fs.existsSync(outputDir)) {
    return;
  }
  for (const file of fs.readdirSync(outputDir)) {
    if (file.endsWith('_opt.glb')) {
      fs.unlinkSync(path.join(outputDir, file));
    }
  }
}

console.log('Optimize Falukant character GLBs (Draco + texture 1024)\n');

if (!fs.existsSync(sourceDir)) {
  console.error(`Source directory not found: ${sourceDir}`);
  process.exit(1);
}

ensureOutputDir();
removeStaleOptimizedModels();

const models = listSourceModels();
if (models.length === 0) {
  console.log('No source GLBs found.');
  process.exit(0);
}

for (const f of models) {
  const input = path.join(sourceDir, f);
  const out = f.replace(/\.glb$/, '_opt.glb');
  const output = path.join(outputDir, out);

  try {
    const result = spawnSync(
      'node',
      [cli, 'optimize', input, output, '--compress', 'draco', '--texture-size', '1024'],
      {
        stdio: 'inherit',
        cwd: path.join(__dirname, '..'),
      }
    );
    if (result.status !== 0) {
      throw new Error(`gltf-transform exited with ${result.status}`);
    }
  } catch (e) {
    console.error(`Failed: ${f}`);
    process.exitCode = 1;
  }
}

console.log(`\nDone. Optimized models written to ${outputDir}`);