window.AppConfig = window.AppConfig || { ready: false };

// ===============================================
// WAIT FOR CONFIG
// ===============================================
function waitForConfig() {
  return new Promise(resolve => {
    if (!window.AppConfig) {
      window.AppConfig = { ready: false };
    }

    if (window.AppConfig.ready) {
      return resolve();
    }

    window.addEventListener("config:ready", resolve, { once: true });
  });
}

// ===============================================
// API WRAPPER
// ===============================================
async function apiGet(url) {
  const token = localStorage.getItem("token");

  const res = await fetch(url, {
    headers: { "Authorization": "Bearer " + token }
  });

  const text = await res.text();
  try {
    return JSON.parse(text);
  } catch {
    console.error("❌ Risposta non JSON:", text);
    throw new Error("Risposta non valida dal server");
  }
}

// ===============================================
// ENDPOINT DINAMICO (photos / activities)
// ===============================================
function apiBase() {
  return state.mode === "activities" ? "/activities" : "/photos";
}

// ===============================================
// GET ALL ITEMS (FULL LOAD)
// ===============================================
async function getAllItems(user) {
  await waitForConfig();
  return apiGet(`${apiBase()}?user=${encodeURIComponent(user)}`);
}

// ===============================================
// GET ITEM BY ID
// ===============================================
async function getItemById(id) {
  await waitForConfig();

  const payload = parseJwt(localStorage.getItem("token"));
  const user = payload?.name || "Common";

  return apiGet(
    `${apiBase()}/byIds?id=${encodeURIComponent(id)}&user=${encodeURIComponent(user)}`
  );
}

// ===============================================
// GET CHANGES (INCREMENTAL SYNC)
// ===============================================
async function getChanges(since, user) {
  await waitForConfig();

  return apiGet(
    `${apiBase()}/changes?since=${encodeURIComponent(since)}&user=${encodeURIComponent(user)}`
  );
}

// ===============================================
// GET HARD DELETES
// ===============================================
async function getDeletedHard(since, user) {
  await waitForConfig();

  const json = await apiGet(
    `${apiBase()}/deleted_hard?since=${encodeURIComponent(since)}&user=${encodeURIComponent(user)}`
  );

  return json.deleted || [];
}

// ===============================================
// FETCH ITEMS BY IDS (bulk)
// ===============================================
async function fetchItemsByIds(ids) {
  if (!ids || !ids.length) return [];

  const qs = ids.map(id => `id=${encodeURIComponent(id)}`).join("&");

  const payload = parseJwt(localStorage.getItem("token"));
  const user = payload?.name || "Common";

  return apiGet(`${apiBase()}/byIds?${qs}&user=${encodeURIComponent(user)}`);
}

// EXPORT
window.getAllItems = getAllItems;
window.getItemById = getItemById;
window.getChanges = getChanges;
window.getDeletedHard = getDeletedHard;
window.fetchItemsByIds = fetchItemsByIds;