import { AttributeErrorFragment } from "@saleor/fragments/types/AttributeErrorFragment";
import useListSettings from "@saleor/hooks/useListSettings";
import useLocalPageInfo, { getMaxPage } from "@saleor/hooks/useLocalPageInfo";
import useNavigator from "@saleor/hooks/useNavigator";
import useNotifier from "@saleor/hooks/useNotifier";
import { getMutationErrors, getStringOrPlaceholder } from "@saleor/misc";
import { ListViews, ReorderEvent } from "@saleor/types";
import { AttributeErrorCode } from "@saleor/types/globalTypes";
import createDialogActionHandlers from "@saleor/utils/handlers/dialogActionHandlers";
import createMetadataCreateHandler from "@saleor/utils/handlers/metadataCreateHandler";
import {
  add,
  isSelected,
  move,
  remove,
  updateAtIndex
} from "@saleor/utils/lists";
import {
  useMetadataUpdate,
  usePrivateMetadataUpdate
} from "@saleor/utils/metadata/updateMetadata";
import React from "react";
import { useIntl } from "react-intl";
import slugify from "slugify";

import AttributePage, {
  AttributePageFormData
} from "../../components/AttributePage";
import AttributeValueDeleteDialog from "../../components/AttributeValueDeleteDialog";
import AttributeValueEditDialog from "../../components/AttributeValueEditDialog";
import { useAttributeCreateMutation } from "../../mutations";
import {
  attributeAddUrl,
  AttributeAddUrlDialog,
  AttributeAddUrlQueryParams,
  attributeListUrl,
  attributeUrl
} from "../../urls";
import {
  AttributeValueEditDialogFormData,
  getAttributeData
} from "../../utils/data";

interface AttributeDetailsProps {
  params: AttributeAddUrlQueryParams;
}

const attributeValueAlreadyExistsError: AttributeErrorFragment = {
  __typename: "AttributeError",
  code: AttributeErrorCode.ALREADY_EXISTS,
  field: "name"
};

function areValuesEqual(
  a: AttributeValueEditDialogFormData,
  b: AttributeValueEditDialogFormData
) {
  return a.name === b.name;
}

const AttributeDetails: React.FC<AttributeDetailsProps> = ({ params }) => {
  const navigate = useNavigator();
  const notify = useNotifier();
  const intl = useIntl();

  const [values, setValues] = React.useState<
    AttributeValueEditDialogFormData[]
  >([]);
  const [valueErrors, setValueErrors] = React.useState<
    AttributeErrorFragment[]
  >([]);

  const { updateListSettings, settings } = useListSettings(
    ListViews.ATTRIBUTE_VALUE_LIST
  );

  const {
    pageInfo,
    pageValues,
    loadNextPage,
    loadPreviousPage,
    loadPage
  } = useLocalPageInfo(values, settings?.rowNumber);

  const [attributeCreate, attributeCreateOpts] = useAttributeCreateMutation({
    onCompleted: data => {
      if (data.attributeCreate.errors.length === 0) {
        notify({
          status: "success",
          text: intl.formatMessage({
            defaultMessage: "Successfully created attribute"
          })
        });
        navigate(attributeUrl(data.attributeCreate.attribute.id));
      }
    }
  });
  const [updateMetadata] = useMetadataUpdate({});
  const [updatePrivateMetadata] = usePrivateMetadataUpdate({});

  const id = params.id
    ? parseInt(params.id, 0) + pageInfo.startCursor
    : undefined;

  const [openModal, closeModal] = createDialogActionHandlers<
    AttributeAddUrlDialog,
    AttributeAddUrlQueryParams
  >(navigate, attributeAddUrl, params);

  React.useEffect(() => setValueErrors([]), [params.action]);

  const handleValueDelete = () => {
    const newValues = remove(values[id], values, areValuesEqual);
    setValues(newValues);
    closeModal();
  };

  const handleValueUpdate = (input: AttributeValueEditDialogFormData) => {
    if (isSelected(input, values, areValuesEqual)) {
      setValueErrors([attributeValueAlreadyExistsError]);
    } else {
      setValues(updateAtIndex(input, values, id));
      closeModal();
    }
  };

  const handleValueCreate = (input: AttributeValueEditDialogFormData) => {
    if (isSelected(input, values, areValuesEqual)) {
      setValueErrors([attributeValueAlreadyExistsError]);
    } else {
      const newValues = add(input, values);
      setValues(newValues);

      const addedToNotVisibleLastPage =
        newValues.length - pageInfo.startCursor > settings.rowNumber;

      if (addedToNotVisibleLastPage) {
        const maxPage = getMaxPage(newValues.length, settings.rowNumber);
        loadPage(maxPage);
      }

      closeModal();
    }
  };

  const handleValueReorder = ({ newIndex, oldIndex }: ReorderEvent) =>
    setValues(
      move(
        values[pageInfo.startCursor + oldIndex],
        values,
        areValuesEqual,
        pageInfo.startCursor + newIndex
      )
    );

  const handleCreate = async (data: AttributePageFormData) => {
    const result = await attributeCreate({
      variables: {
        input: getAttributeData(data, values)
      }
    });

    return {
      id: result.data.attributeCreate?.attribute?.id || null,
      errors: getMutationErrors(result)
    };
  };

  const handleSubmit = createMetadataCreateHandler(
    handleCreate,
    updateMetadata,
    updatePrivateMetadata
  );

  return (
    <AttributePage
      attribute={null}
      disabled={attributeCreateOpts.loading}
      errors={attributeCreateOpts.data?.attributeCreate.errors || []}
      onBack={() => navigate(attributeListUrl())}
      onDelete={undefined}
      onSubmit={handleSubmit}
      onValueAdd={() => openModal("add-value")}
      onValueDelete={id =>
        openModal("remove-value", {
          id
        })
      }
      onValueReorder={handleValueReorder}
      onValueUpdate={id =>
        openModal("edit-value", {
          id
        })
      }
      saveButtonBarState={attributeCreateOpts.status}
      values={{
        __typename: "AttributeValueCountableConnection" as "AttributeValueCountableConnection",
        pageInfo: {
          __typename: "PageInfo" as "PageInfo",
          endCursor: "",
          hasNextPage: false,
          hasPreviousPage: false,
          startCursor: ""
        },
        edges: pageValues.map((value, valueIndex) => ({
          __typename: "AttributeValueCountableEdge" as "AttributeValueCountableEdge",
          cursor: "1",
          node: {
            __typename: "AttributeValue" as "AttributeValue",
            file: value?.fileUrl
              ? {
                  url: value.fileUrl,
                  contentType: value.contentType,
                  __typename: "File"
                }
              : null,
            id: valueIndex.toString(),
            reference: null,
            slug: slugify(value.name).toLowerCase(),
            sortOrder: valueIndex,
            value: null,
            richText: null,
            boolean: null,
            date: null,
            dateTime: null,
            ...value
          }
        }))
      }}
      settings={settings}
      onUpdateListSettings={updateListSettings}
      pageInfo={pageInfo}
      onNextPage={loadNextPage}
      onPreviousPage={loadPreviousPage}
    >
      {data => (
        <>
          <AttributeValueEditDialog
            attributeValue={null}
            confirmButtonState="default"
            disabled={false}
            errors={valueErrors}
            open={params.action === "add-value"}
            onClose={closeModal}
            onSubmit={handleValueCreate}
            inputType={data.inputType}
          />
          {values.length > 0 && (
            <>
              <AttributeValueDeleteDialog
                attributeName={undefined}
                open={params.action === "remove-value"}
                name={getStringOrPlaceholder(values[id]?.name)}
                confirmButtonState="default"
                onClose={closeModal}
                onConfirm={handleValueDelete}
              />
              <AttributeValueEditDialog
                inputType={data.inputType}
                attributeValue={values[id]}
                confirmButtonState="default"
                disabled={false}
                errors={valueErrors}
                open={params.action === "edit-value"}
                onClose={closeModal}
                onSubmit={handleValueUpdate}
              />
            </>
          )}
        </>
      )}
    </AttributePage>
  );
};
AttributeDetails.displayName = "AttributeDetails";

export default AttributeDetails;