// public/js/config.js
// Configurazione globale caricata dal backend.

(() => {
  "use strict";

  const DEFAULT_CONFIG = {
    ready: false,
    baseUrl: "",
    pathFull: "",
    galleryRefreshSeconds: 60,
    mapboxToken: null
  };

  // Mantiene eventuali valori già inizializzati nell'HTML.
  window.AppConfig = {
    ...DEFAULT_CONFIG,
    ...(window.AppConfig || {})
  };

  window.BASE_URL =
    window.BASE_URL ?? "";

  window.PATH_FULL =
    window.PATH_FULL ?? "";

  window.PHOTOS_URL =
    window.PHOTOS_URL ?? "";

  window.MEDIA_BASE_ORIGIN =
    window.MEDIA_BASE_ORIGIN ?? "";

  // Mantiene invariati i percorsi restituiti dal backend.
  function toAbsoluteUrl(pathOrUrl) {
    return pathOrUrl
      ? String(pathOrUrl)
      : "";
  }

  window.toAbsoluteUrl = toAbsoluteUrl;

  async function loadConfig() {
    try {
      const response = await fetch("/config", {
        method: "GET",
        cache: "no-store",
        headers: {
          Accept: "application/json"
        }
      });

      if (!response.ok) {
        throw new Error(
          `Errore configurazione: HTTP ${response.status}`
        );
      }

      const data = await response.json();

      window.AppConfig = {
        ...DEFAULT_CONFIG,
        ...data,
        ready: true
      };

      window.BASE_URL =
        window.AppConfig.baseUrl || "";

      window.PATH_FULL =
        window.AppConfig.pathFull || "";

      console.log(
        "[config] Configurazione caricata",
        {
          ready:
            window.AppConfig.ready,

          baseUrl:
            window.AppConfig.baseUrl,

          pathFullConfigured:
            Boolean(
              window.AppConfig.pathFull
            ),

          mapboxConfigured:
            Boolean(
              window.AppConfig.mapboxToken
            )
        }
      );

      window.dispatchEvent(
        new CustomEvent("config:ready", {
          detail: window.AppConfig
        })
      );

      return window.AppConfig;
    } catch (error) {
      console.error(
        "[config] Errore caricamento:",
        error
      );

      window.AppConfig = {
        ...DEFAULT_CONFIG,
        ...(window.AppConfig || {}),
        ready: true,
        error: error.message
      };

      window.dispatchEvent(
        new CustomEvent("config:error", {
          detail: {
            error,
            config: window.AppConfig
          }
        })
      );

      return window.AppConfig;
    }
  }

  // Promessa globale usata da mapBaseLayers.js.
  window.AppConfigPromise = loadConfig();
})();