src/hooks/useCurrentDateIndices.js

import { useSelector } from 'react-redux'
import dataDateRanges from '../config/dataDateRanges'
import { paramsSelectors } from '../stores/paramsStore'
import { dataSelectors } from '../stores/dataStore'
const { selectStoredDataset } = dataSelectors
const { selectPartialDataParam, selectCurrentTable, selectDates } =
    paramsSelectors

/**
 * Helper hook to get date indices in the current redux state. Returns
 * positional information for easy renaming.
 *
 * @category Hooks
 * @returns {Array} Positional data [ currentIndex: number, currDates: string[],
 *   currDatesAvailable: string[], dates:string[], currRange: number, rangeType:
 *   string ]
 */
function useCurrentDateIndices() {
    const nIndex = useSelector(selectPartialDataParam('nIndex'))
    const dIndex = useSelector(selectPartialDataParam('dIndex'))
    const nRange = useSelector(selectPartialDataParam('nRange'))
    const dRange = useSelector(selectPartialDataParam('dRange'))
    const rangeType = useSelector(selectPartialDataParam('rangeType'))
    const dates = useSelector(selectDates)
    const currentTable = useSelector(selectCurrentTable)
    const currentNumeratorName = currentTable?.numerator?.name?.split('.')[0]

    const dataset = useSelector(selectStoredDataset(currentNumeratorName))
    const currDates = dataset?.dates

    const currDatesAvailable =
        dataDateRanges[currentTable?.numerator?.name?.split('.')[0]]

    const currentIndex = nIndex === null && dIndex === null
            ? currDatesAvailable?.slice(-1)[0] || dates.length - 1
            : nIndex || dIndex
    const currRange = nRange || dRange
    
    return [
        currentIndex,
        currDates || [],
        currDatesAvailable || [],
        dates || [],
        currRange,
        rangeType,
    ]
}

export default useCurrentDateIndices