// Fifth Domain private host projection. One world runtime root per physical host.
import fs from 'node:fs';
import path from 'node:path';
import crypto from 'node:crypto';
import { pathToFileURL } from 'node:url';

export const WORLD_RUNTIME_ROOT = process.platform === 'darwin'
  ? '/Volumes/JZAO/铸渊-ICE-GL-ZY001/CODEX-DEV-20260915/光湖语言世界'
  : process.platform === 'linux'
  ? '/opt/guanghu/glw-2.0/current'
  : (() => { throw new Error('GLW2_WORLD_ROOT_HOST_UNREGISTERED'); })();

const pointer = JSON.parse(fs.readFileSync(path.join(WORLD_RUNTIME_ROOT, 'CURRENT-WORLD.json'), 'utf8'));
if (pointer.world_id !== 'GLW-2.0-0001' || !String(pointer.state || '').startsWith('CURRENT_'))
  throw new Error('GLW2_WORLD_POINTER_INVALID');
const source = path.join(WORLD_RUNTIME_ROOT, pointer.world_root_source);
const gir = path.join(WORLD_RUNTIME_ROOT, pointer.world_root_gir);
if (JSON.parse(fs.readFileSync(gir, 'utf8')).compiled_from?.source_sha256 !==
    crypto.createHash('sha256').update(fs.readFileSync(source)).digest('hex'))
  throw new Error('GLW2_WORLD_ROOT_SOURCE_HASH_MISMATCH');

export function worldRuntimeUrl(filename) {
  if (!/^[A-Za-z0-9.-]+\.mjs$/.test(filename)) throw new Error('WORLD_RUNTIME_MODULE_NOT_REGISTERED');
  const file = path.join(WORLD_RUNTIME_ROOT, '运行时', filename);
  if (!fs.existsSync(file) || fs.lstatSync(file).isSymbolicLink()) throw new Error('WORLD_RUNTIME_MODULE_MISSING_OR_SYMLINK');
  return pathToFileURL(file).href;
}