import placeholderImg from "@assets/images/placeholder255x255.png";
import {
  getAttributesAfterFileAttributesUpdate,
  mergeAttributeValueDeleteErrors,
  mergeFileUploadErrors,
} from "@saleor/attributes/utils/data";
import {
  handleDeleteMultipleAttributeValues,
  handleUploadMultipleFiles,
  prepareAttributesInput,
} from "@saleor/attributes/utils/handlers";
import { createVariantChannels } from "@saleor/channels/utils";
import { AttributeInput } from "@saleor/components/Attributes";
import NotFoundPage from "@saleor/components/NotFoundPage";
import { WindowTitle } from "@saleor/components/WindowTitle";
import { DEFAULT_INITIAL_SEARCH_DATA } from "@saleor/config";
import {
  ProductErrorWithAttributesFragment,
  ProductVariantFragment,
  useAttributeValueDeleteMutation,
  useFileUploadMutation,
  useProductVariantChannelListingUpdateMutation,
  useProductVariantDetailsQuery,
  useProductVariantPreorderDeactivateMutation,
  useProductVariantReorderMutation,
  useUpdateMetadataMutation,
  useUpdatePrivateMetadataMutation,
  useVariantDeleteMutation,
  useVariantMediaAssignMutation,
  useVariantMediaUnassignMutation,
  useVariantUpdateMutation,
  useWarehouseListQuery,
} from "@saleor/graphql";
import useNavigator from "@saleor/hooks/useNavigator";
import useNotifier from "@saleor/hooks/useNotifier";
import useOnSetDefaultVariant from "@saleor/hooks/useOnSetDefaultVariant";
import useShop from "@saleor/hooks/useShop";
import { commonMessages } from "@saleor/intl";
import { getAttributeInputFromVariant } from "@saleor/products/utils/data";
import usePageSearch from "@saleor/searches/usePageSearch";
import useProductSearch from "@saleor/searches/useProductSearch";
import useAttributeValueSearchHandler from "@saleor/utils/handlers/attributeValueSearchHandler";
import createDialogActionHandlers from "@saleor/utils/handlers/dialogActionHandlers";
import createMetadataUpdateHandler from "@saleor/utils/handlers/metadataUpdateHandler";
import { mapEdgesToItems } from "@saleor/utils/maps";
import { warehouseAddPath } from "@saleor/warehouses/urls";
import React, { useEffect, useState } from "react";
import { useIntl } from "react-intl";

import { extractMutationErrors, weight } from "../../misc";
import ProductVariantDeleteDialog from "../components/ProductVariantDeleteDialog";
import ProductVariantPage from "../components/ProductVariantPage";
import { ProductVariantUpdateSubmitData } from "../components/ProductVariantPage/form";
import {
  productUrl,
  productVariantEditUrl,
  ProductVariantEditUrlDialog,
  ProductVariantEditUrlQueryParams,
} from "../urls";
import { mapFormsetStockToStockInput } from "../utils/data";
import { createVariantReorderHandler } from "./ProductUpdate/handlers";

interface ProductUpdateProps {
  variantId: string;
  productId: string;
  params: ProductVariantEditUrlQueryParams;
}

export const ProductVariant: React.FC<ProductUpdateProps> = ({
  variantId,
  productId,
  params,
}) => {
  const shop = useShop();
  const navigate = useNavigator();
  const notify = useNotifier();
  const intl = useIntl();
  const [errors, setErrors] = useState<ProductErrorWithAttributesFragment[]>(
    [],
  );
  useEffect(() => {
    setErrors([]);
  }, [variantId]);

  const { data, loading } = useProductVariantDetailsQuery({
    displayLoader: true,
    variables: {
      id: variantId,
      firstValues: 10,
    },
  });
  const [updateMetadata] = useUpdateMetadataMutation({});
  const [updatePrivateMetadata] = useUpdatePrivateMetadataMutation({});

  const [
    updateChannels,
    updateChannelsOpts,
  ] = useProductVariantChannelListingUpdateMutation({});

  const [openModal] = createDialogActionHandlers<
    ProductVariantEditUrlDialog,
    ProductVariantEditUrlQueryParams
  >(
    navigate,
    params => productVariantEditUrl(productId, variantId, params),
    params,
  );

  const [uploadFile, uploadFileOpts] = useFileUploadMutation({});

  const [assignMedia, assignMediaOpts] = useVariantMediaAssignMutation({});
  const [unassignMedia, unassignMediaOpts] = useVariantMediaUnassignMutation(
    {},
  );
  const [deleteVariant, deleteVariantOpts] = useVariantDeleteMutation({
    onCompleted: () => {
      notify({
        status: "success",
        text: intl.formatMessage({
          id: "BUKMzM",
          defaultMessage: "Variant removed",
        }),
      });
      navigate(productUrl(productId));
    },
  });

  const [updateVariant, updateVariantOpts] = useVariantUpdateMutation({
    onCompleted: data => {
      if (data.productVariantUpdate.errors.length === 0) {
        notify({
          status: "success",
          text: intl.formatMessage(commonMessages.savedChanges),
        });
      }
      setErrors(data.productVariantUpdate.errors);
    },
  });

  const [
    deleteAttributeValue,
    deleteAttributeValueOpts,
  ] = useAttributeValueDeleteMutation({});

  const handleSubmitChannels = async (
    data: ProductVariantUpdateSubmitData,
    variant: ProductVariantFragment,
  ) => {
    const channelsHaveChanged = data.channelListings.some(channel => {
      const variantChannel = variant.channelListings.find(
        variantChannel => variantChannel.channel.id === channel.id,
      );

      const priceHasChanged =
        channel.value.price !== variantChannel?.price?.amount.toString();

      const costPriceHasChanged =
        channel.value.costPrice !==
        variantChannel?.costPrice?.amount.toString();

      const preorderThresholdHasChanged =
        channel.value?.preorderThreshold !==
        variantChannel.preorderThreshold.quantity;

      return (
        priceHasChanged || costPriceHasChanged || preorderThresholdHasChanged
      );
    });

    if (channelsHaveChanged) {
      return extractMutationErrors(
        updateChannels({
          variables: {
            id: variant.id,
            input: data.channelListings.map(listing => ({
              channelId: listing.id,
              costPrice: listing.value.costPrice || null,
              price: listing.value.price,
              preorderThreshold: listing.value.preorderThreshold,
            })),
          },
        }),
      );
    }

    return [];
  };

  const variant = data?.productVariant;
  const channels = createVariantChannels(variant);

  const warehouses = useWarehouseListQuery({
    displayLoader: true,
    variables: {
      first: 50,
      filter: {
        channels: channels.map(channel => channel.id),
      },
    },
  });

  const [
    deactivatePreorder,
    deactivatePreoderOpts,
  ] = useProductVariantPreorderDeactivateMutation({});
  const handleDeactivateVariantPreorder = (id: string) =>
    deactivatePreorder({ variables: { id } });

  const [
    reorderProductVariants,
    reorderProductVariantsOpts,
  ] = useProductVariantReorderMutation({});

  const onSetDefaultVariant = useOnSetDefaultVariant(productId, variant);

  const handleVariantReorder = createVariantReorderHandler(
    variant?.product,
    variables => reorderProductVariants({ variables }),
  );

  const disableFormSave =
    loading ||
    uploadFileOpts.loading ||
    deleteVariantOpts.loading ||
    updateVariantOpts.loading ||
    assignMediaOpts.loading ||
    unassignMediaOpts.loading ||
    deactivatePreoderOpts.loading ||
    reorderProductVariantsOpts.loading ||
    deleteAttributeValueOpts.loading;

  const handleMediaSelect = (id: string) => () => {
    if (variant) {
      if (variant?.media?.map(media_obj => media_obj.id).indexOf(id) !== -1) {
        unassignMedia({
          variables: {
            mediaId: id,
            variantId: variant.id,
          },
        });
      } else {
        assignMedia({
          variables: {
            mediaId: id,
            variantId: variant.id,
          },
        });
      }
    }
  };

  const handleUpdate = async (data: ProductVariantUpdateSubmitData) => {
    const uploadFilesResult = await handleUploadMultipleFiles(
      data.attributesWithNewFileValue,
      variables => uploadFile({ variables }),
    );

    const deleteAttributeValuesResult = await handleDeleteMultipleAttributeValues(
      data.attributesWithNewFileValue,
      variant?.nonSelectionAttributes,
      variables => deleteAttributeValue({ variables }),
    );

    const updatedFileAttributes = getAttributesAfterFileAttributesUpdate(
      data.attributesWithNewFileValue,
      uploadFilesResult,
    );

    const result = await updateVariant({
      variables: {
        addStocks: data.addStocks.map(mapFormsetStockToStockInput),
        attributes: prepareAttributesInput({
          attributes: data.attributes,
          prevAttributes: getAttributeInputFromVariant(variant),
          updatedFileAttributes,
        }),
        id: variantId,
        removeStocks: data.removeStocks,
        sku: data.sku,
        quantityLimitPerCustomer: Number(data.quantityLimitPerCustomer) || null,
        stocks: data.updateStocks.map(mapFormsetStockToStockInput),
        trackInventory: data.trackInventory,
        preorder: data.isPreorder
          ? {
              globalThreshold: data.globalThreshold
                ? parseInt(data.globalThreshold, 10)
                : null,
              endDate: data?.preorderEndDateTime || null,
            }
          : null,
        weight: weight(data.weight),
        firstValues: 10,
      },
    });
    await handleSubmitChannels(data, variant);

    return [
      ...mergeFileUploadErrors(uploadFilesResult),
      ...mergeAttributeValueDeleteErrors(deleteAttributeValuesResult),
      ...result.data?.productVariantStocksCreate.errors,
      ...result.data?.productVariantStocksDelete.errors,
      ...result.data?.productVariantStocksUpdate.errors,
      ...result.data?.productVariantUpdate.errors,
    ];
  };
  const handleSubmit = createMetadataUpdateHandler(
    data?.productVariant,
    handleUpdate,
    variables => updateMetadata({ variables }),
    variables => updatePrivateMetadata({ variables }),
  );

  const handleAssignAttributeReferenceClick = (attribute: AttributeInput) =>
    navigate(
      productVariantEditUrl(productId, variantId, {
        action: "assign-attribute-value",
        id: attribute.id,
      }),
    );

  const {
    loadMore: loadMorePages,
    search: searchPages,
    result: searchPagesOpts,
  } = usePageSearch({
    variables: DEFAULT_INITIAL_SEARCH_DATA,
  });
  const {
    loadMore: loadMoreProducts,
    search: searchProducts,
    result: searchProductsOpts,
  } = useProductSearch({
    variables: DEFAULT_INITIAL_SEARCH_DATA,
  });
  const {
    loadMore: loadMoreAttributeValues,
    search: searchAttributeValues,
    result: searchAttributeValuesOpts,
    reset: searchAttributeReset,
  } = useAttributeValueSearchHandler(DEFAULT_INITIAL_SEARCH_DATA);

  const fetchMoreReferencePages = {
    hasMore: searchPagesOpts.data?.search?.pageInfo?.hasNextPage,
    loading: searchPagesOpts.loading,
    onFetchMore: loadMorePages,
  };
  const fetchMoreReferenceProducts = {
    hasMore: searchProductsOpts.data?.search?.pageInfo?.hasNextPage,
    loading: searchProductsOpts.loading,
    onFetchMore: loadMoreProducts,
  };
  const fetchMoreAttributeValues = {
    hasMore: !!searchAttributeValuesOpts.data?.attribute?.choices?.pageInfo
      ?.hasNextPage,
    loading: !!searchAttributeValuesOpts.loading,
    onFetchMore: loadMoreAttributeValues,
  };

  const attributeValues =
    mapEdgesToItems(searchAttributeValuesOpts?.data?.attribute.choices) || [];

  if (variant === null) {
    return <NotFoundPage backHref={productUrl(productId)} />;
  }

  return (
    <>
      <WindowTitle title={data?.productVariant?.name} />
      <ProductVariantPage
        productId={productId}
        defaultWeightUnit={shop?.defaultWeightUnit}
        defaultVariantId={data?.productVariant.product.defaultVariant?.id}
        errors={errors}
        attributeValues={attributeValues}
        channels={channels}
        channelErrors={
          updateChannelsOpts?.data?.productVariantChannelListingUpdate
            ?.errors || []
        }
        onSetDefaultVariant={onSetDefaultVariant}
        saveButtonBarState={updateVariantOpts.status}
        loading={disableFormSave}
        placeholderImage={placeholderImg}
        variant={variant}
        header={variant?.name || variant?.sku}
        warehouses={mapEdgesToItems(warehouses?.data?.warehouses) || []}
        onDelete={() => openModal("remove")}
        onMediaSelect={handleMediaSelect}
        onSubmit={async data => {
          const errors = await handleSubmit(data);
          const channelErrors = await handleSubmitChannels(data, variant);

          return [...errors, ...channelErrors];
        }}
        onWarehouseConfigure={() => navigate(warehouseAddPath)}
        onVariantPreorderDeactivate={handleDeactivateVariantPreorder}
        variantDeactivatePreoderButtonState={deactivatePreoderOpts.status}
        onVariantReorder={handleVariantReorder}
        assignReferencesAttributeId={
          params.action === "assign-attribute-value" && params.id
        }
        onAssignReferencesClick={handleAssignAttributeReferenceClick}
        referencePages={mapEdgesToItems(searchPagesOpts?.data?.search) || []}
        referenceProducts={
          mapEdgesToItems(searchProductsOpts?.data?.search) || []
        }
        fetchReferencePages={searchPages}
        fetchMoreReferencePages={fetchMoreReferencePages}
        fetchReferenceProducts={searchProducts}
        fetchMoreReferenceProducts={fetchMoreReferenceProducts}
        fetchAttributeValues={searchAttributeValues}
        fetchMoreAttributeValues={fetchMoreAttributeValues}
        onCloseDialog={() =>
          navigate(productVariantEditUrl(productId, variantId))
        }
        onAttributeSelectBlur={searchAttributeReset}
      />
      <ProductVariantDeleteDialog
        confirmButtonState={deleteVariantOpts.status}
        onClose={() => navigate(productVariantEditUrl(productId, variantId))}
        onConfirm={() =>
          deleteVariant({
            variables: {
              id: variantId,
            },
          })
        }
        open={params.action === "remove"}
        name={data?.productVariant?.name}
      />
    </>
  );
};
export default ProductVariant;