import fs from 'node:fs';
import path from 'node:path';

/**
 * Runtime configuration resolved from the environment.
 *
 * The static directory prefers the Vite production build (`dist/`) and falls
 * back to `public/` so a dev-mode server never 404s outright.
 */
export class AppConfig {
  readonly port: number;
  readonly host: string;
  readonly staticDir: string;

  constructor(env: Record<string, string | undefined> = process.env, cwd: string = process.cwd()) {
    this.port = Number(env.PORT || 8080);
    this.host = env.HOST || '0.0.0.0';
    const dist = path.join(cwd, 'dist');
    this.staticDir = fs.existsSync(dist) ? dist : path.join(cwd, 'public');
  }
}