// Copies Draco + KTX2/Basis decoder WASM from three.js into public/ so the
// runtime paths /draco/ and /basis/ resolve (version-matched to installed three).
// Also copies the web-ifc single-thread WASM to public/web-ifc/ for the IFC path.
// Runs automatically via `npm install` (postinstall). Safe to re-run.
import {
  chmodSync,
  cpSync,
  copyFileSync,
  existsSync,
  mkdirSync,
  readdirSync,
  rmSync,
} from 'node:fs';
import { dirname, resolve } from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = dirname(fileURLToPath(import.meta.url));
const root = resolve(__dirname, '..');

function normalizePublicModes(directory) {
  chmodSync(directory, 0o755);
  for (const entry of readdirSync(directory, { withFileTypes: true })) {
    const path = resolve(directory, entry.name);
    if (entry.isDirectory()) normalizePublicModes(path);
    else if (entry.isFile()) chmodSync(path, 0o644);
  }
}

const threeEntry = fileURLToPath(import.meta.resolve('three'));
const threeRoot = resolve(dirname(threeEntry), '..');
const libs = resolve(threeRoot, 'examples/jsm/libs');
const targets = [
  [resolve(libs, 'draco/gltf'), resolve(root, 'public/draco')],
  [resolve(libs, 'basis'), resolve(root, 'public/basis')],
];

if (!existsSync(libs)) {
  console.warn('[copy-decoders] three not installed yet — skipping (will run on next install).');
  process.exit(0);
}

for (const [src, dest] of targets) {
  if (!existsSync(src)) {
    console.warn(`[copy-decoders] source missing: ${src}`);
    continue;
  }
  rmSync(dest, { force: true, recursive: true });
  mkdirSync(dest, { recursive: true });
  cpSync(src, dest, { recursive: true });
  normalizePublicModes(dest);
  console.log(`[copy-decoders] ${src} -> ${dest}`);
}

// web-ifc single-thread WASM (+ MT build if present) for the IFC load path.
const ifcEntry = fileURLToPath(import.meta.resolve('web-ifc'));
const ifcSrcDir = dirname(ifcEntry);
const ifcDest = resolve(root, 'public/web-ifc');
if (existsSync(ifcSrcDir)) {
  mkdirSync(ifcDest, { recursive: true });
  for (const wasm of ['web-ifc.wasm', 'web-ifc-mt.wasm']) {
    const src = resolve(ifcSrcDir, wasm);
    if (!existsSync(src)) continue;
    const dest = resolve(ifcDest, wasm);
    copyFileSync(src, dest);
    chmodSync(dest, 0o644);
    console.log(`[copy-decoders] ${src} -> ${dest}`);
  }
} else {
  console.warn('[copy-decoders] web-ifc not installed yet — skipping IFC wasm.');
}
