import { useCallback, useEffect, useMemo, useState } from 'react';
import { useWatch } from 'react-hook-form';
import type { UseQueryOptions } from '@tanstack/react-query';

import { useGetList } from '../../dataProvider';
import { useReference } from '../useReference';
import { useReferenceParams } from './useReferenceParams';
import { useWrappedSource } from '../../core';
import type { FilterPayload, RaRecord, SortPayload } from '../../types';
import type { ChoicesContextValue } from '../../form';

/**
 * A hook for choosing a reference record. Useful for foreign keys.
 *
 * This hook fetches the possible values in the reference resource
 * (using `dataProvider.getList()`), it returns the possible choices
 * as the `choices` attribute.
 *
 * @example
 * const {
 *      choices, // the available reference resource
 * } = useReferenceInputController({
 *      input, // the input props
 *      resource: 'comments',
 *      reference: 'posts',
 *      source: 'post_id',
 * });
 *
 * The hook also allow to filter results. It returns a `setFilters`
 * function. It uses the value to create a filter for the query.
 * You can also add a permanentFilter to further filter the result:
 *
 * @example
 * const {
 *      choices, // the available reference resource
 *      setFilter,
 * } = useReferenceInputController({
 *      input, // the input props
 *      resource: 'comments',
 *      reference: 'posts',
 *      source: 'post_id',
 *      permanentFilter: {
 *          author: 'john'
 *      },
 * });
 */
export const useReferenceInputController = <RecordType extends RaRecord = any>(
    props: UseReferenceInputControllerParams
): ChoicesContextValue<RecordType> => {
    const {
        debounce,
        enableGetChoices,
        filter,
        page: initialPage = 1,
        perPage: initialPerPage = 25,
        sort: initialSort,
        queryOptions = {},
        reference,
        source,
    } = props;
    const { meta, ...otherQueryOptions } = queryOptions;

    const [params, paramsModifiers] = useReferenceParams({
        resource: reference,
        page: initialPage,
        perPage: initialPerPage,
        sort: initialSort,
        debounce,
        filter,
    });

    // selection logic
    const finalSource = useWrappedSource(source);
    const currentValue = useWatch({ name: finalSource });

    const isGetMatchingEnabled = enableGetChoices
        ? enableGetChoices(params.filterValues)
        : true;

    // fetch possible values
    const {
        data: possibleValuesData = [],
        total,
        pageInfo,
        isFetching: isFetchingPossibleValues,
        isLoading: isLoadingPossibleValues,
        isPending: isPendingPossibleValues,
        error: errorPossibleValues,
        refetch: refetchGetList,
    } = useGetList<RecordType>(
        reference,
        {
            pagination: {
                page: params.page,
                perPage: params.perPage,
            },
            sort: { field: params.sort, order: params.order },
            filter: { ...params.filter, ...filter },
            meta,
        },
        {
            enabled: isGetMatchingEnabled,
            placeholderData: previousData => previousData,
            ...otherQueryOptions,
        }
    );

    // fetch current value
    const {
        referenceRecord: currentReferenceRecord,
        refetch: refetchReference,
        error: errorReference,
        isLoading: isLoadingReference,
        isFetching: isFetchingReference,
        isPending: isPendingReference,
    } = useReference<RecordType>({
        id: currentValue,
        reference,
        // @ts-ignore the types of the queryOptions for the getMAny and getList are not compatible
        options: {
            enabled: currentValue != null && currentValue !== '',
            meta,
            ...otherQueryOptions,
        },
    });

    const isPending =
        // The reference query isn't enabled when there is no value yet but as it has no data, react-query will flag it as pending
        (currentValue != null && currentValue !== '' && isPendingReference) ||
        isPendingPossibleValues;

    // We need to delay the update of the referenceRecord and the finalData
    // to the next React state update, because otherwise it can raise a warning
    // with AutocompleteInput saying the current value is not in the list of choices
    const [referenceRecord, setReferenceRecord] = useState<
        RecordType | undefined
    >(undefined);
    useEffect(() => {
        setReferenceRecord(currentReferenceRecord);
    }, [currentReferenceRecord]);

    // add current value to possible sources
    let finalData: RecordType[], finalTotal: number | undefined;
    if (
        !referenceRecord ||
        possibleValuesData.find(record => record.id === referenceRecord.id)
    ) {
        finalData = possibleValuesData;
        finalTotal = total;
    } else {
        finalData = [referenceRecord, ...possibleValuesData];
        finalTotal = total == null ? undefined : total + 1;
    }

    const refetch = useCallback(() => {
        refetchGetList();
        refetchReference();
    }, [refetchGetList, refetchReference]);

    const currentSort = useMemo(
        () => ({
            field: params.sort,
            order: params.order,
        }),
        [params.sort, params.order]
    );
    return {
        sort: currentSort,
        allChoices: finalData,
        availableChoices: possibleValuesData,
        selectedChoices: referenceRecord ? [referenceRecord] : [],
        displayedFilters: params.displayedFilters,
        error: errorReference || errorPossibleValues,
        filter: params.filter,
        filterValues: params.filterValues,
        hideFilter: paramsModifiers.hideFilter,
        isFetching: isFetchingReference || isFetchingPossibleValues,
        isLoading: isLoadingReference || isLoadingPossibleValues,
        isPending: isPending,
        page: params.page,
        perPage: params.perPage,
        refetch,
        resource: reference,
        setFilters: paramsModifiers.setFilters,
        setPage: paramsModifiers.setPage,
        setPerPage: paramsModifiers.setPerPage,
        setSort: paramsModifiers.setSort,
        showFilter: paramsModifiers.showFilter,
        // we return source and not finalSource because child inputs (e.g. AutocompleteInput) already call useInput and compute the final source
        source,
        total: finalTotal,
        hasNextPage: pageInfo
            ? pageInfo.hasNextPage
            : total != null
              ? params.page * params.perPage < total
              : undefined,
        hasPreviousPage: pageInfo ? pageInfo.hasPreviousPage : params.page > 1,
        isFromReference: true,
    } as ChoicesContextValue<RecordType>;
};

export interface UseReferenceInputControllerParams<
    RecordType extends RaRecord = any,
> {
    debounce?: number;
    filter?: FilterPayload;
    queryOptions?: Omit<
        UseQueryOptions<{
            data: RecordType[];
            total?: number;
            pageInfo?: {
                hasNextPage?: boolean;
                hasPreviousPage?: boolean;
            };
        }>,
        'queryFn' | 'queryKey'
    > & { meta?: any };
    page?: number;
    perPage?: number;
    record?: RaRecord;
    reference: string;
    resource?: string;
    sort?: SortPayload;
    source: string;
    enableGetChoices?: (filters: any) => boolean;
}