// cart-cookie-utils.js
import Cookies from 'js-cookie';
import checkboxUpdateState from './checkBoxState';

// Constants
const CART_ITEMS_COOKIE = 'cart_data';
const SELECTED_ITEMS_COOKIE = 'cart_selected_items';
const COOKIE_EXPIRY_DAYS = 7; // Cookie akan berlaku selama 7 hari

/**
 * Mengambil data cart lengkap dari cookie
 * @returns {Object} Object dengan key cart_id dan value cart item data lengkap
 */
export const getCartDataFromCookie = () => {
  try {
    const storedData = Cookies.get(CART_ITEMS_COOKIE);
    return storedData ? JSON.parse(storedData) : {};
  } catch (error) {
    console.error('Error reading cart data from cookie:', error);
    return {};
  }
};

/**
 * Menyimpan data cart lengkap ke cookie
 * @param {Object} cartData Object dengan key cart_id dan value cart item data lengkap
 */
export const setCartDataToCookie = (cartData) => {
  try {
    Cookies.set(CART_ITEMS_COOKIE, JSON.stringify(cartData), {
      expires: COOKIE_EXPIRY_DAYS,
      path: '/',
      sameSite: 'strict',
    });
  } catch (error) {
    console.error('Error saving cart data to cookie:', error);
  }
};

/**
 * Mengambil state selected items dari cookie
 * @returns {Object} Object dengan key product id dan value boolean selected status
 */
export const getSelectedItemsFromCookie = () => {
  try {
    const storedItems = Cookies.get(SELECTED_ITEMS_COOKIE);
    return storedItems ? JSON.parse(storedItems) : {};
  } catch (error) {
    console.error('Error reading selected items from cookie:', error);
    return {};
  }
};

/**
 * Menyimpan state selected items ke cookie
 * @param {Object} items Object dengan key product id dan value boolean selected status
 */
export const setSelectedItemsToCookie = (items) => {
  try {
    Cookies.set(SELECTED_ITEMS_COOKIE, JSON.stringify(items), {
      expires: COOKIE_EXPIRY_DAYS,
      path: '/',
      sameSite: 'strict',
    });
  } catch (error) {
    console.error('Error saving selected items to cookie:', error);
  }
};

/**
 * Transform cart items dari format API ke format yang lebih simpel untuk disimpan di cookie
 * @param {Array} cartItems Array cart items dari API
 * @returns {Object} Object dengan key cart_id dan value cart item data
 */
export const transformCartItemsForCookie = (cartItems) => {
  if (!cartItems || !Array.isArray(cartItems)) return {};

  const cartData = {};

  cartItems.forEach((item) => {
    // Skip items yang tidak memiliki cart_id
    if (!item.cart_id) return;

    cartData[item.cart_id] = {
      id: item.id,
      cart_id: item.cart_id,
      cart_type: item.cart_type,
      product: item.product_id
        ? {
            id: item.product_id,
            name: item.product_name || '',
          }
        : null,
      program_line: item.program_line_id
        ? {
            id: item.program_line_id,
            name: item.program_line_name || '',
          }
        : null,
      quantity: item.quantity,
      selected: item.selected,
      price: item.price,
      package_price: item.package_price,
      source: item.source || 'add_to_cart',
    };
  });

  return cartData;
};

/**
 * Sinkronisasi cart data dan selected items dari server dengan cookie
 * @param {Object} cart Cart object dari API
 * @returns {Object} Object yang berisi updated cartData dan selectedItems
 */
export const syncCartWithCookie = (cart) => {
  try {
    if (!cart || !cart.products) return { needsUpdate: false };

    // Transform data API ke cookie
    const serverCartData = transformCartItemsForCookie(cart.products);

    // Ambil data lama dari cookie
    const existingCartData = getCartDataFromCookie();

    // Ambil selected status dari cookie
    const selectedItems = getSelectedItemsFromCookie();

    // Gabungkan data cart, (prioritize data server)
    const mergedCartData = { ...existingCartData, ...serverCartData };

    // Periksa apakah ada perbedaan status selected
    let needsUpdate = false;

    // Update selected status berdasarkan cookie jika ada
    for (const cartId in mergedCartData) {
      const item = mergedCartData[cartId];
      if (item.id && selectedItems[item.id] !== undefined) {
        // Jika status di cookie berbeda dengan di cart
        if (item.selected !== selectedItems[item.id]) {
          needsUpdate = true;
          item.selected = selectedItems[item.id];
        }
      } else if (item.id) {
        selectedItems[item.id] = item.selected;
      }
    }

    // Simpan ke cookie
    setCartDataToCookie(mergedCartData);
    setSelectedItemsToCookie(selectedItems);

    return {
      cartData: mergedCartData,
      selectedItems,
      needsUpdate,
    };
  } catch (error) {
    console.error('Error syncing cart with cookie:', error);
    return { needsUpdate: false };
  }
};

/**
 * Update selected status item di cookie
 * @param {number} productId ID produk
 * @param {boolean} isSelected Status selected baru
 * @param {boolean} notifyUpdate Whether to notify checkbox update state (default: true)
 */
export const updateSelectedItemInCookie = (
  productId,
  isSelected,
  notifyUpdate = true
) => {
  try {
    // Notify checkbox update state if requested
    if (notifyUpdate) {
      checkboxUpdateState.startUpdate();
    }

    const selectedItems = getSelectedItemsFromCookie();
    selectedItems[productId] = isSelected;
    setSelectedItemsToCookie(selectedItems);

    // Update juga di cart data
    const cartData = getCartDataFromCookie();

    for (const cartId in cartData) {
      const item = cartData[cartId];
      if (item.id === productId) {
        item.selected = isSelected;
      }
    }

    setCartDataToCookie(cartData);

    return { selectedItems, cartData };
  } catch (error) {
    console.error('Error updating selected item in cookie:', error);
    return {};
  } finally {
    // End update notification if requested
    if (notifyUpdate) {
      checkboxUpdateState.endUpdate();
    }
  }
};

/**
 * Set semua item menjadi selected atau unselected di cookie
 * @param {Array} productIds Array product IDs
 * @param {boolean} isSelected Status selected baru
 * @param {boolean} notifyUpdate Whether to notify checkbox update state (default: true)
 */
export const setAllSelectedInCookie = (
  productIds,
  isSelected,
  notifyUpdate = true
) => {
  try {
    // Notify checkbox update state if requested
    if (notifyUpdate) {
      checkboxUpdateState.startUpdate();
    }

    const selectedItems = getSelectedItemsFromCookie();

    productIds.forEach((id) => {
      if (id) selectedItems[id] = isSelected;
    });

    setSelectedItemsToCookie(selectedItems);

    // Update juga di cart data
    const cartData = getCartDataFromCookie();

    for (const cartId in cartData) {
      if (productIds.includes(cartData[cartId].id)) {
        cartData[cartId].selected = isSelected;
      }
    }

    setCartDataToCookie(cartData);

    return { selectedItems, cartData };
  } catch (error) {
    console.error('Error setting all selected in cookie:', error);
    return {};
  } finally {
    // End update notification if requested
    if (notifyUpdate) {
      checkboxUpdateState.endUpdate();
    }
  }
};

/**
 * Hapus item dari cookie
 * @param {Array} cartIds Array cart IDs untuk dihapus
 */
export const removeCartItemsFromCookie = (cartIds) => {
  try {
    const cartData = getCartDataFromCookie();
    const selectedItems = getSelectedItemsFromCookie();
    const productIdsToRemove = [];

    // Hapus item dari cartData dan catat product IDs
    cartIds.forEach((cartId) => {
      if (cartData[cartId]) {
        if (cartData[cartId].id) {
          productIdsToRemove.push(cartData[cartId].id);
        }
        delete cartData[cartId];
      }
    });

    // Hapus dari selectedItems
    productIdsToRemove.forEach((productId) => {
      if (selectedItems[productId] !== undefined) {
        delete selectedItems[productId];
      }
    });

    // Simpan kembali ke cookie
    setCartDataToCookie(cartData);
    setSelectedItemsToCookie(selectedItems);

    return { cartData, selectedItems };
  } catch (error) {
    console.error('Error removing cart items from cookie:', error);
    return {};
  }
};

/**
 * Hapus item selected dari cookie berdasarkan product IDs
 * @param {Array} productIds Array product IDs untuk dihapus
 */
/**
 * Hapus item selected dari cookie berdasarkan product IDs dan juga hapus dari cart data
 * @param {Array} productIds Array product IDs untuk dihapus
 */

/**
 * Force reset semua selected items ke unselected state
 */
export const forceResetAllSelectedItems = () => {
  try {
    checkboxUpdateState.startUpdate();

    const cartData = getCartDataFromCookie();
    const selectedItems = {};

    // Reset semua selected status di cartData
    for (const cartId in cartData) {
      cartData[cartId].selected = false;
      if (cartData[cartId].id) {
        selectedItems[cartData[cartId].id] = false;
      }
    }

    // Simpan kembali ke cookie
    setCartDataToCookie(cartData);
    setSelectedItemsToCookie(selectedItems);

    return { cartData, selectedItems };
  } catch (error) {
    console.error('Error resetting all selected items:', error);
    return {};
  } finally {
    checkboxUpdateState.endUpdate();
  }
};

/**
 * Sync selected items between cookie and cart data
 * @param {Array} cartProducts Products array from cart
 */
export const syncSelectedItemsWithCookie = (cartProducts) => {
  try {
    if (!cartProducts || !Array.isArray(cartProducts)) {
      return { items: {}, needsUpdate: false };
    }

    const selectedItems = getSelectedItemsFromCookie();
    let needsUpdate = false;

    // Check if we need to update any items based on cookie values
    cartProducts.forEach((product) => {
      if (product.id && selectedItems[product.id] !== undefined) {
        if (product.selected !== selectedItems[product.id]) {
          needsUpdate = true;
        }
      } else if (product.id) {
        // If not in cookie, add with current value
        selectedItems[product.id] = product.selected;
      }
    });

    // Update the cookie with the latest values
    setSelectedItemsToCookie(selectedItems);

    return { items: selectedItems, needsUpdate };
  } catch (error) {
    console.error('Error syncing selected items with cookie:', error);
    return { items: {}, needsUpdate: false };
  }
};

// Export the checkbox update state for use in components
export { checkboxUpdateState };

/**
 * Hapus item selected dari cookie berdasarkan product IDs dan juga hapus dari cart data
 * @param {Array} productIds Array product IDs untuk dihapus
 */
/**
 * Hapus item selected dari cookie berdasarkan product IDs dan juga hapus dari cart data
 * @param {Array} productIds Array product IDs untuk dihapus
 */
export const removeSelectedItemsFromCookie = (productIds) => {
  try {
    const selectedItems = getSelectedItemsFromCookie();
    const cartData = getCartDataFromCookie();
    const cartIdsToRemove = [];

    // Find cart IDs that match the product IDs
    for (const cartId in cartData) {
      if (productIds.includes(cartData[cartId].id)) {
        cartIdsToRemove.push(cartId);
      }
    }

    // Remove from selectedItems
    productIds.forEach((productId) => {
      if (selectedItems[productId] !== undefined) {
        delete selectedItems[productId];
      }
    });

    // Remove from cartData
    cartIdsToRemove.forEach((cartId) => {
      delete cartData[cartId];
    });

    // Save both cookies
    setSelectedItemsToCookie(selectedItems);
    setCartDataToCookie(cartData);

    return { selectedItems, cartData };
  } catch (error) {
    console.error('Error removing selected items from cookie:', error);
    return {};
  }
};

class QuantityUpdateState {
  constructor() {
    this.updateItems = new Set();
    this.listeners = new Set();
  }

  startUpdate(itemId) {
    this.updateItems.add(itemId);
    this.notifyListeners();
  }

  endUpdate(itemId) {
    this.updateItems.delete(itemId);
    this.notifyListeners();
  }

  isAnyQuantityUpdating() {
    return this.updateItems.size > 0;
  }

  isItemUpdating(itemId) {
    return this.updateItems.has(itemId);
  }

  addListener(callback) {
    this.listeners.add(callback);
  }

  removeListener(callback) {
    this.listeners.delete(callback);
  }

  notifyListeners() {
    const isUpdating = this.isAnyQuantityUpdating();
    this.listeners.forEach(callback => callback(isUpdating));
  }
}

export const quantityUpdateState = new QuantityUpdateState();