// public/js/map/spatialIndex.js
// ===============================
// INDICE SPAZIALE FOTO (RBush)
// ===============================

(function () {
  "use strict";

  if (!window.GP) {
    window.GP = {};
  }

  if (!window.GP.libs?.RBush) {
    console.error("[spatialIndex] RBush non disponibile");
    return;
  }

  const tree = new window.GP.libs.RBush();

  let indexed = false;
  let totalItems = 0;

  function build(items) {
    tree.clear();

    const nodes = [];

    for (const item of items) {
      const lat = Number(item?.gps?.lat);
      const lng = Number(item?.gps?.lng);

      if (!Number.isFinite(lat) || !Number.isFinite(lng)) {
        continue;
      }

      nodes.push({
        minX: lng,
        minY: lat,
        maxX: lng,
        maxY: lat,

        id: item.id,
        lat,
        lng,
        item,
      });
    }

    tree.load(nodes);

    indexed = true;
    totalItems = nodes.length;

    console.log("[spatialIndex] indicizzate", totalItems, "foto");
  }

  function search(bounds) {
    if (!indexed) {
      return [];
    }

    // ricerca globale
    if (!bounds) {
      return tree.all();
    }

    return tree.search({
      minX: bounds.getWest(),
      minY: bounds.getSouth(),
      maxX: bounds.getEast(),
      maxY: bounds.getNorth(),
    });
  }

  function clear() {
    tree.clear();
    indexed = false;
    totalItems = 0;
  }

  function stats() {
    return {
      indexed,
      totalItems,
    };
  }

  function isBuilt() {
    return indexed;
  }

  window.MapSpatialIndex = {
    build,
    search,
    clear,
    stats,
    isBuilt,
  };
})();