const config = require("../config/index");
const messages = require("../constants/messages");
const { formatDate } = require("../utils/date");

const STORAGE_KEYS = {
  favorites: "naming:favorites",
  quotaPrefix: "naming:quota:"
};

function createDefaultForm() {
  return {
    surname: "",
    gender: "male",
    birthDate: formatDate(new Date()),
    birthTime: "",
    nameLength: "double"
  };
}

const state = {
  form: createDefaultForm(),
  results: [],
  favorites: [],
  quota: {
    date: "",
    count: 0
  },
  lastError: ""
};

function getQuotaStorageKey(dateStr) {
  return `${STORAGE_KEYS.quotaPrefix}${dateStr.replace(/-/g, "")}`;
}

function safeGetStorage(key, fallback) {
  if (typeof tt === "undefined" || !tt.getStorageSync) {
    return fallback;
  }
  try {
    const value = tt.getStorageSync(key);
    return value === undefined || value === null ? fallback : value;
  } catch (error) {
    console.warn(`getStorageSync failed for key ${key}`, error);
    return fallback;
  }
}

function safeSetStorage(key, value) {
  if (typeof tt === "undefined" || !tt.setStorageSync) {
    return;
  }
  try {
    tt.setStorageSync(key, value);
  } catch (error) {
    console.warn(`setStorageSync failed for key ${key}`, error);
    state.lastError = error.message || "storage_error";
  }
}

function syncQuota() {
  const today = formatDate(new Date());
  const storageKey = getQuotaStorageKey(today);
  const storedCount = safeGetStorage(storageKey, 0);
  const count = typeof storedCount === "number" ? storedCount : 0;
  state.quota = {
    date: today,
    count
  };
}

function incrementQuota() {
  const today = formatDate(new Date());
  if (state.quota.date !== today) {
    syncQuota();
  }
  const nextCount = state.quota.count + 1;
  state.quota = {
    date: today,
    count: nextCount
  };
  safeSetStorage(getQuotaStorageKey(today), nextCount);
}

function canGenerateToday() {
  const today = formatDate(new Date());
  if (state.quota.date !== today) {
    syncQuota();
  }
  return state.quota.count < config.maxDailyQuota;
}

function setForm(partial) {
  state.form = Object.assign({}, state.form, partial);
}

function resetForm() {
  state.form = createDefaultForm();
}

function setResults(results) {
  state.results = Array.isArray(results) ? results : [];
}

function clearResults() {
  state.results = [];
}

function loadFavorites() {
  const stored = safeGetStorage(STORAGE_KEYS.favorites, []);
  state.favorites = Array.isArray(stored) ? stored : [];
}

function saveFavorites() {
  safeSetStorage(STORAGE_KEYS.favorites, state.favorites);
}

function addFavorite(item) {
  if (!item || !item.name) {
    state.lastError = messages.GENERATION_FAILED;
    return null;
  }
  const timestamp = Date.now();
  const newItem = {
    id: `${item.name}_${timestamp}`,
    name: item.name,
    meaning: item.meaning || "",
    createdAt: new Date(timestamp).toISOString()
  };
  const existingIndex = state.favorites.findIndex((fav) => fav.name === item.name);
  if (existingIndex >= 0) {
    state.favorites.splice(existingIndex, 1, newItem);
  } else {
    state.favorites.unshift(newItem);
  }
  saveFavorites();
  return newItem;
}

function removeFavorite(id) {
  const nextList = state.favorites.filter((favorite) => favorite.id !== id);
  state.favorites = nextList;
  saveFavorites();
}

function getState() {
  return state;
}

function initStore() {
  syncQuota();
  loadFavorites();
}

module.exports = {
  initStore,
  getState,
  setForm,
  resetForm,
  setResults,
  clearResults,
  canGenerateToday,
  incrementQuota,
  addFavorite,
  removeFavorite,
  loadFavorites
};