Made of little things.

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

// The upstream Vite plugin embeds config.schema.json into the signed build.
// Config is optional: these defaults apply when the host has no settings form.
export const settings = {
  showCoords: true,
  sharePointer: true,
  autoLive: true,
};

const listeners = new Set<() => void>();
export function onSettings(listener: () => void): void {
  listeners.add(listener);
}

if (runtimeHasDomain('config')) {
  void (async () => {
    // Some hosts consume the embedded schema; others need standard registration.
    // Do not replace a schema that the host already supplied.
    if (!config.schema) {
      await config.registerSchema(settingsSchema as Parameters<typeof config.registerSchema>[0]);
    }
    const subscription = config.subscribe((values) => {
      settings.showCoords = values.showCoords !== false;
      settings.sharePointer = values.sharePointer !== false;
      settings.autoLive = values.autoLive !== false;
      listeners.forEach((listener) => listener());
    });
    window.addEventListener('pagehide', () => subscription.close(), { once: true });
  })().catch(() => {
    // Optional operations may be unavailable even when a host exposes the domain.
  });
}