export const getNormalizedIndex = (
    subFocus: number | 'first' | 'last',
    registeredIndexes: number
): number =>
    subFocus === 'first'
        ? 0
        : subFocus === 'last'
          ? registeredIndexes - 1
          : subFocus

export const shouldPreventNavigation = (
    direction: 'right' | 'left',
    subFocus: number | 'first' | 'last',
    registeredIndexes: number
): boolean => {
    const index = getNormalizedIndex(subFocus, registeredIndexes)
    if (direction === 'right') {
        return registeredIndexes > 0 && index < registeredIndexes - 1
    } else {
        return registeredIndexes > 0 && index > 0
    }
}

export const getNextSubFocusIndex = (
    direction: 'right' | 'left',
    current: number | 'first' | 'last',
    registeredIndexes: number
): number => {
    const indexNormalized = getNormalizedIndex(current, registeredIndexes)

    if (registeredIndexes > 0) {
        if (direction === 'right') {
            if (indexNormalized < registeredIndexes - 1) {
                return indexNormalized + 1
            }
            return registeredIndexes - 1
        } else {
            if (indexNormalized > 0) {
                return indexNormalized - 1
            }
            return 0
        }
    }
    return -1
}