import {
	ADD_TO_WISHLIST,
	BULK_WISHLIST,
	REMOVE_ALL_FROM_WISHLIST,
	REMOVE_FROM_WISHLIST,
} from '@graphql/mutations/wishlist';
import type {
	IAddToWishlistResponse,
	IBulkWishlistResponse,
	IRemoveAllFromWishlistResponse,
	IRemoveFromWishlistResponse,
} from '@types';

interface IOverwriteWishlistArguments {
	type: string;
	productUuid: string;
	productName: string;
	bulkAction?: string;
	isBulkSync?: boolean;
	products?: {
		uuid: string;
	}[];
}

export function useWishlistOverwrite() {
	const { t } = useI18n();
	const wishlistStore = useWishlistStore();
	const userStore = useUserStore();
	const { $appHelpers, $notify } = useNuxtApp();

	const isAuthenticated = computed(() => userStore.isAuthenticated);
	const wishlistUuid = computed(() => wishlistStore.wishlist?.uuid);

	const cookieWishlist = useCookie($appHelpers.COOKIES_WISHLIST_KEY, {
		default: () => [],
		path: '/',
		watch: true,
	});

	const {
		mutate: addMutate,
		loading: addLoading,
		error: addError,
	} = useMutation<IAddToWishlistResponse>(ADD_TO_WISHLIST);
	const {
		mutate: removeMutate,
		loading: removeLoading,
		error: removedError,
	} = useMutation<IRemoveFromWishlistResponse>(REMOVE_FROM_WISHLIST);
	const {
		mutate: removeAllMutate,
		loading: removeAllLoading,
		error: removeAllError,
	} = useMutation<IRemoveAllFromWishlistResponse>(REMOVE_ALL_FROM_WISHLIST);
	const {
		mutate: bulkMutate,
		loading: bulkLoading,
		error: bulkError,
	} = useMutation<IBulkWishlistResponse>(BULK_WISHLIST);

	async function overwriteWishlist(args: IOverwriteWishlistArguments) {
		if (isAuthenticated.value) {
			switch (args.type) {
				case 'add': {
					const addResult = await addMutate({
						wishlistUuid: wishlistUuid.value,
						productUuid: args.productUuid,
					});

					if (addResult?.data?.addWishlistProduct?.wishlist) {
						wishlistStore.setWishlist(addResult.data.addWishlistProduct.wishlist);

						$notify({
							message: t('popup.success.addToWishlist', {
								product: args.productName,
							}),
							type: 'success',
						});
					}

					break;
				}

				case 'remove': {
					const removeResult = await removeMutate({
						wishlistUuid: wishlistUuid.value,
						productUuid: args.productUuid,
					});

					if (removeResult?.data?.removeWishlistProduct?.wishlist) {
						wishlistStore.setWishlist(removeResult.data.removeWishlistProduct.wishlist);

						$notify({
							message: t('popup.success.removeFromWishlist', {
								product: args.productName,
							}),
							type: 'success',
						});
					}

					break;
				}

				case 'removeAll': {
					const removeAllResult = await removeAllMutate({
						wishlistUuid: wishlistUuid.value,
						productUuid: args.productUuid,
					});

					if (removeAllResult?.data?.removeAllWishlistProducts?.wishlist) {
						wishlistStore.setWishlist(removeAllResult.data.removeAllWishlistProducts.wishlist);

						$notify({
							message: t('popup.success.removeAllFromWishlist'),
							type: 'success',
						});
					}

					break;
				}

				case 'bulk': {
					const bulkResult = await bulkMutate({
						wishlistUuid: wishlistUuid.value,
						action: args.bulkAction,
						products: args.products,
					});

					if (bulkResult?.data?.bulkWishlistAction?.wishlist) {
						wishlistStore.setWishlist(bulkResult.data.bulkWishlistAction.wishlist);

						if (args.isBulkSync) {
							cookieWishlist.value = [];
						} else {
							$notify({
								message: t('popup.success.bulkRemoveWishlist'),
								type: 'success',
							});
						}
					}

					break;
				}

				default:
					console.error('No type provided for overwriteWishlist');
			}
		} else {
			switch (args.type) {
				case 'add': {
					const current = Array.isArray(cookieWishlist.value)
							? [...cookieWishlist.value]
							: [];

					if (current.includes(args.productUuid)) {
						$notify({
							message: t('popup.errors.alreadyInWishlist', {
								product: args.productName,
							}),
							type: 'warning',
						});
						return;
					}

					current.push(args.productUuid);
					cookieWishlist.value = current;

					$notify({
						message: t('popup.success.addToWishlist', {
							product: args.productName,
						}),
						type: 'success',
					});

					break;
				}

				case 'remove': {
					cookieWishlist.value = Array.isArray(cookieWishlist.value)
							? cookieWishlist.value.filter(
									(uuid) => uuid !== args.productUuid
							)
							: [];

					$notify({
						message: t('popup.success.removeFromWishlist', {
							product: args.productName,
						}),
						type: 'success',
					});

					break;
				}

				case 'removeAll': {
					cookieWishlist.value = [];

					$notify({
						message: t('popup.success.removeAllFromWishlist'),
						type: 'success',
					});

					break;
				}

				case 'bulk': {
					const bulkResult = await bulkMutate({
						wishlistUuid: wishlistUuid.value,
						action: args.bulkAction,
						products: args.products,
					});

					if (bulkResult?.data?.bulkWishlistAction?.wishlist) {
						wishlistStore.setWishlist(bulkResult.data.bulkWishlistAction.wishlist);

						if (args.isBulkSync) {
							cookieWishlist.value = [];
						} else {
							$notify({
								message: t('popup.success.bulkRemoveWishlist'),
								type: 'success',
							});
						}
					}

					break;
				}

				default:
					console.error('No type provided for overwriteWishlist');
			}
		}
	}

	watch(
			[addError, removedError, removeAllError, bulkError],
			(errors) => {
				const err = errors.find(Boolean);
				if (!err) return;
				console.error('useWishlistOverwrite error:', err);
				let message = t('popup.errors.defaultError');
				if (isGraphQLError(err)) {
					message = err.graphQLErrors?.[0]?.message || message;
				} else {
					message = err.message;
				}
				$notify({
					message,
					type: 'error',
					title: t('popup.errors.main'),
				});
			}
	);

	return {
		addLoading,
		removeLoading,
		removeAllLoading,
		bulkLoading,
		overwriteWishlist,
	};
}