/**
 * External dependencies
 */
import type { Cart, CartTotals, CartMeta, CartItem } from '@woocommerce/types';

/**
 * Internal dependencies
 */
import { CartState, defaultCartState } from '../default-states';
import type { ResponseError } from '../types';

/**
 * Retrieves cart data from state.
 *
 * @param {CartState} state The current state.
 * @return {Cart} The data to return.
 */
export const getCartData = ( state: CartState ): Cart => {
	return state.cartData;
};

/**
 * Retrieves cart totals from state.
 *
 * @param {CartState} state The current state.
 * @return {CartTotals} The data to return.
 */
export const getCartTotals = ( state: CartState ): CartTotals => {
	return state.cartData.totals || defaultCartState.cartData.totals;
};

/**
 * Retrieves cart meta from state.
 *
 * @param {CartState} state The current state.
 * @return {CartMeta} The data to return.
 */
export const getCartMeta = ( state: CartState ): CartMeta => {
	return state.metaData || defaultCartState.metaData;
};

/**
 * Retrieves cart errors from state.
 *
 * @param {CartState} state The current state.
 * @return {Array<ResponseError>} Array of errors.
 */
export const getCartErrors = ( state: CartState ): Array< ResponseError > => {
	return state.errors;
};

/**
 * Returns true if any coupon is being applied.
 *
 * @param {CartState} state The current state.
 * @return {boolean} True if a coupon is being applied.
 */
export const isApplyingCoupon = ( state: CartState ): boolean => {
	return !! state.metaData.applyingCoupon;
};

/**
 * Returns true if cart is stale, false if it is not.
 *
 * @param {CartState} state The current state.
 * @return {boolean} True if the cart data is stale.
 */
export const isCartDataStale = ( state: CartState ): boolean => {
	return state.metaData.isCartDataStale;
};

/**
 * Retrieves the coupon code currently being applied.
 *
 * @param {CartState} state The current state.
 * @return {string} The data to return.
 */
export const getCouponBeingApplied = ( state: CartState ): string => {
	return state.metaData.applyingCoupon || '';
};

/**
 * Returns true if any coupon is being removed.
 *
 * @param {CartState} state The current state.
 * @return {boolean} True if a coupon is being removed.
 */
export const isRemovingCoupon = ( state: CartState ): boolean => {
	return !! state.metaData.removingCoupon;
};

/**
 * Retrieves the coupon code currently being removed.
 *
 * @param {CartState} state The current state.
 * @return {string} The data to return.
 */
export const getCouponBeingRemoved = ( state: CartState ): string => {
	return state.metaData.removingCoupon || '';
};

/**
 * Returns cart item matching specified key.
 *
 * @param {CartState} state The current state.
 * @param {string} cartItemKey Key for a cart item.
 * @return {CartItem | void} Cart item object, or undefined if not found.
 */
export const getCartItem = (
	state: CartState,
	cartItemKey: string
): CartItem | void => {
	return state.cartData.items.find(
		( cartItem ) => cartItem.key === cartItemKey
	);
};

/**
 * Returns true if the specified cart item quantity is being updated.
 *
 * @param {CartState} state The current state.
 * @param {string} cartItemKey Key for a cart item.
 * @return {boolean} True if a item has a pending request to be updated.
 */
export const isItemPendingQuantity = (
	state: CartState,
	cartItemKey: string
): boolean => {
	return state.cartItemsPendingQuantity.includes( cartItemKey );
};

/**
 * Returns true if the specified cart item quantity is being updated.
 *
 * @param {CartState} state The current state.
 * @param {string} cartItemKey Key for a cart item.
 * @return {boolean} True if a item has a pending request to be updated.
 */
export const isItemPendingDelete = (
	state: CartState,
	cartItemKey: string
): boolean => {
	return state.cartItemsPendingDelete.includes( cartItemKey );
};
/**
 * Retrieves if the address is being applied for shipping.
 *
 * @param {CartState} state The current state.
 * @return {boolean} are shipping rates loading.
 */
export const isCustomerDataUpdating = ( state: CartState ): boolean => {
	return !! state.metaData.updatingCustomerData;
};

/**
 * Retrieves if the shipping rate selection is being persisted.
 *
 * @param {CartState} state The current state.
 *
 * @return {boolean} True if the shipping rate selection is being persisted to
 *                   the server.
 */
export const isShippingRateBeingSelected = ( state: CartState ): boolean => {
	return !! state.metaData.updatingSelectedRate;
};
