const fs = require('fs');
const path = require('path');

class ModuleLoader {
  constructor(modulesDir) {
    this.modulesDir = path.resolve(modulesDir);
    this.modules = {};
  }

  discover() {
    if (!fs.existsSync(this.modulesDir)) return [];
    const entries = fs.readdirSync(this.modulesDir, { withFileTypes: true });
    return entries.filter(e => e.isDirectory()).map(d => d.name);
  }

  loadAll(engineContext) {
    const names = this.discover();
    names.forEach(name => {
      const modPath = path.join(this.modulesDir, name);
      try {
        const mod = require(modPath);
        if (typeof mod.init === 'function') {
          mod.init(engineContext);
        }
        this.modules[name] = mod;
      } catch (err) {
        console.error(`Failed to load module ${name}:`, err && err.stack ? err.stack : err);
      }
    });
    return this.modules;
  }
}

module.exports = ModuleLoader;