Made of little things.

import { config } from '@napplet/sdk';
import { runtimeHasDomain } from './domain-availability.js';
import settingsSchema from '../config.schema.json';

export interface GameSettings {
  sound: boolean;
  screenShake: boolean;
}

const gameSettings: GameSettings = { sound: true, screenShake: true };
const listeners = new Set<(settings: GameSettings) => void>();

/** Subscribe to live NAP-CONFIG values. Returns an unsubscribe function. */
export function onSettingsChanged(
  listener: (settings: GameSettings) => void,
): () => void {
  listeners.add(listener);
  listener(gameSettings);
  return () => {
    listeners.delete(listener);
  };
}

function apply(values: Record<string, unknown>): void {
  if (typeof values.sound === 'boolean') gameSettings.sound = values.sound;
  if (typeof values.screenShake === 'boolean') {
    gameSettings.screenShake = values.screenShake;
  }
  for (const listener of listeners) listener(gameSettings);
}

// The Vite plugin embeds config.schema.json in the signed build. Some hosts
// consume that metadata directly; others need the standard registration call.
// Keep the in-game defaults when config is absent or the schema is refused.
if (runtimeHasDomain('config')) {
  void (async () => {
    if (!config.schema) {
      await config.registerSchema(
        settingsSchema as Parameters<typeof config.registerSchema>[0],
      );
    }
    const subscription = config.subscribe(apply);
    window.addEventListener('pagehide', () => subscription.close(), { once: true });
  })().catch(() => {
    // Optional settings never block the arcade from booting.
  });
}