// ===============================
// state.js — Stato condiviso (foto + attività)
// ===============================

// Modalità corrente: "photos" | "activities"
window.state = {
  mode: "photos", // default
  items: [],      // contiene gli item della modalità corrente
};

// ===============================
// MODE HELPERS
// ===============================
function normalizeMode(mode) {
  return mode === "activities" ? "activities" : "photos";
}

function cacheKeyForMode(mode) {
  return normalizeMode(mode) === "photos"
    ? "photosCache"
    : "activitiesCache";
}

function lastSyncKeyForMode(mode) {
  return normalizeMode(mode) === "photos"
    ? "lastSyncPhotos"
    : "lastSyncActivities";
}

// ===============================
// LAST SYNC
// ===============================
function getLastSync() {
  return getLastSyncForMode(state.mode);
}

function setLastSync(ts) {
  setLastSyncForMode(state.mode, ts);
}

function getLastSyncForMode(mode) {
  return localStorage.getItem(lastSyncKeyForMode(mode));
}

function setLastSyncForMode(mode, ts) {
  if (!ts) return;
  localStorage.setItem(lastSyncKeyForMode(mode), ts);
}

// ===============================
// GET / SET ITEMS
// ===============================
function getLocalItems() {
  return state.items;
}

function getLocalItemsForMode(mode) {
  try {
    const safeMode = normalizeMode(mode);
    const raw = localStorage.getItem(cacheKeyForMode(safeMode));
    if (!raw) return [];

    const arr = JSON.parse(raw);
    return Array.isArray(arr) ? arr : [];
  } catch (e) {
    console.warn("getLocalItemsForMode error:", e);
    return [];
  }
}

function setLocalItems(arr) {
  // Compatibilità con codice vecchio.
  // Salva in base alla modalità corrente.
  setLocalItemsForMode(state.mode, arr);
}

function setLocalItemsForMode(mode, arr) {
  const safeMode = normalizeMode(mode);
  const safeArr = Array.isArray(arr) ? arr : [];

  try {
    localStorage.setItem(cacheKeyForMode(safeMode), JSON.stringify(safeArr));

    // Aggiorna state.items solo se sto salvando la modalità attualmente visibile
    if (state.mode === safeMode) {
      state.items = safeArr;
    }
  } catch (e) {
    console.warn("setLocalItemsForMode error:", e);
  }
}

function setLocalPhotos(arr) {
  setLocalItemsForMode("photos", arr);
}

function setLocalActivities(arr) {
  setLocalItemsForMode("activities", arr);
}

// ===============================
// ADD / REMOVE ITEM
// ===============================
function addItemLocal(item) {
  addItemLocalForMode(state.mode, item);
}

function addItemLocalForMode(mode, item) {
  if (!item || item.id == null) return;

  const safeMode = normalizeMode(mode);
  const arr = getLocalItemsForMode(safeMode);

  const next = arr.filter(x => String(x.id) !== String(item.id));
  next.push(item);

  setLocalItemsForMode(safeMode, next);
}

function removeItemLocal(id) {
  removeItemLocalForMode(state.mode, id);
}

function removeItemLocalForMode(mode, id) {
  if (id == null) return;

  const safeMode = normalizeMode(mode);
  const arr = getLocalItemsForMode(safeMode);

  const before = arr.length;
  const next = arr.filter(x => String(x.id) !== String(id));
  const after = next.length;

  console.log("[removeItemLocalForMode]", {
    mode: safeMode,
    id,
    before,
    after,
  });

  setLocalItemsForMode(safeMode, next);
}

function addPhotoLocal(item) {
  addItemLocalForMode("photos", item);
}

function addActivityLocal(item) {
  addItemLocalForMode("activities", item);
}

function removePhotoLocal(id) {
  removeItemLocalForMode("photos", id);
}

function removeActivityLocal(id) {
  removeItemLocalForMode("activities", id);
}

// ===============================
// LOCAL STORAGE CACHE
// ===============================
function saveLocalState() {
  saveLocalStateForMode(state.mode);
}

function saveLocalStateForMode(mode) {
  const safeMode = normalizeMode(mode);

  try {
    const arr = state.mode === safeMode
      ? state.items
      : getLocalItemsForMode(safeMode);

    localStorage.setItem(cacheKeyForMode(safeMode), JSON.stringify(arr || []));
  } catch (e) {
    console.warn("saveLocalStateForMode error:", e);
  }
}

function savePhotosCache() {
  saveLocalStateForMode("photos");
}

function saveActivitiesCache() {
  saveLocalStateForMode("activities");
}

function loadLocalState() {
  try {
    const safeMode = normalizeMode(state.mode);
    const arr = getLocalItemsForMode(safeMode);

    // Non filtrare qui deleted_at.
    // Il filtro deve stare solo in gallery.js,
    // perché dipende dal checkbox "Mostra eliminate".
    state.items = arr;

    return state.items;
  } catch (e) {
    console.warn("loadLocalState error:", e);
  }

  state.items = [];
  return [];
}


// ===============================
// CAMBIO MODALITÀ GALLERY
// ===============================
function setGalleryMode(mode) {
  const safeMode = normalizeMode(mode);

  state.mode = safeMode;
  loadLocalState();

  if (typeof refreshGallery === "function") {
    refreshGallery();
  }

  console.log("[setGalleryMode]", {
    mode: state.mode,
    items: getLocalItems().length,
    sample: getLocalItems().slice(0, 3),
  });
}

// ===============================
// EXPORT
// ===============================
window.normalizeMode = normalizeMode;

window.getLastSync = getLastSync;
window.setLastSync = setLastSync;
window.getLastSyncForMode = getLastSyncForMode;
window.setLastSyncForMode = setLastSyncForMode;

window.getLocalItems = getLocalItems;
window.setLocalItems = setLocalItems;

window.getLocalItemsForMode = getLocalItemsForMode;
window.setLocalItemsForMode = setLocalItemsForMode;

window.setLocalPhotos = setLocalPhotos;
window.setLocalActivities = setLocalActivities;

window.addItemLocal = addItemLocal;
window.removeItemLocal = removeItemLocal;

window.addItemLocalForMode = addItemLocalForMode;
window.removeItemLocalForMode = removeItemLocalForMode;

window.addPhotoLocal = addPhotoLocal;
window.addActivityLocal = addActivityLocal;
window.removePhotoLocal = removePhotoLocal;
window.removeActivityLocal = removeActivityLocal;

window.saveLocalState = saveLocalState;
window.saveLocalStateForMode = saveLocalStateForMode;
window.savePhotosCache = savePhotosCache;
window.saveActivitiesCache = saveActivitiesCache;

window.loadLocalState = loadLocalState;
window.setGalleryMode = setGalleryMode;