'use client';
import { useButton_unstable } from '@fluentui/react-button';
import { ChevronLeftRegular, ChevronRightRegular } from '@fluentui/react-icons';
import { mergeCallbacks, useEventCallback, slot, useIsomorphicLayoutEffect, useMergedRefs } from '@fluentui/react-utilities';
import * as React from 'react';
import { useCarouselContext_unstable as useCarouselContext } from '../CarouselContext';
import { carouselButtonClassNames } from './useCarouselButtonStyles.styles';
import { useFluent_unstable as useFluent } from '@fluentui/react-shared-contexts';
/**
 * Create the state required to render CarouselButton.
 *
 * The returned state can be modified with hooks such as useCarouselButtonStyles_unstable,
 * before being passed to renderCarouselButton_unstable.
 *
 * @param props - props from this instance of CarouselButton
 * @param ref - reference to root HTMLDivElement of CarouselButton
 */ export const useCarouselButton_unstable = (props, ref)=>{
    const { navType = 'next', ...buttonProps } = props;
    // Locally tracks the total number of slides, will only update if this changes.
    const [totalSlides, setTotalSlides] = React.useState(0);
    const { dir } = useFluent();
    const buttonRef = React.useRef(undefined);
    const circular = useCarouselContext((ctx)=>ctx.circular);
    const [canLoop, setCanLoop] = React.useState(circular);
    const containerRef = useCarouselContext((ctx)=>ctx.containerRef);
    const selectPageByDirection = useCarouselContext((ctx)=>ctx.selectPageByDirection);
    const subscribeForValues = useCarouselContext((ctx)=>ctx.subscribeForValues);
    const resetAutoplay = useCarouselContext((ctx)=>ctx.resetAutoplay);
    const isTrailing = useCarouselContext((ctx)=>{
        if (circular && canLoop) {
            return false;
        }
        if (navType === 'prev') {
            return ctx.activeIndex === 0;
        }
        return ctx.activeIndex === totalSlides - 1;
    });
    const handleClick = (event)=>{
        if (event.isDefaultPrevented()) {
            return;
        }
        const nextIndex = selectPageByDirection(event, navType);
        let _trailing = false;
        if (navType === 'prev') {
            _trailing = nextIndex === 0;
        } else {
            _trailing = nextIndex === totalSlides - 1;
        }
        if (!circular && _trailing && (containerRef === null || containerRef === void 0 ? void 0 : containerRef.current)) {
            // Focus non-disabled element
            const buttonRefs = containerRef.current.querySelectorAll(`.${carouselButtonClassNames.root}`);
            buttonRefs.forEach((_buttonRef)=>{
                if (_buttonRef !== buttonRef.current) {
                    _buttonRef.focus();
                }
            });
        }
        resetAutoplay();
    };
    useIsomorphicLayoutEffect(()=>{
        return subscribeForValues((data)=>{
            if (data.canLoop !== undefined) {
                // Only update canLoop if it has been defined by the carousel engine
                setCanLoop(data.canLoop);
            }
            setTotalSlides(data.navItemsCount);
        });
    }, [
        subscribeForValues
    ]);
    const nextArrowIcon = dir === 'ltr' ? /*#__PURE__*/ React.createElement(ChevronRightRegular, null) : /*#__PURE__*/ React.createElement(ChevronLeftRegular, null);
    const prevArrowIcon = dir === 'ltr' ? /*#__PURE__*/ React.createElement(ChevronLeftRegular, null) : /*#__PURE__*/ React.createElement(ChevronRightRegular, null);
    return {
        navType,
        // We lean on react-button class to handle styling and icon enhancements
        ...useButton_unstable({
            icon: slot.optional(props.icon, {
                defaultProps: {
                    children: navType === 'next' ? nextArrowIcon : prevArrowIcon
                },
                renderByDefault: true,
                elementType: 'span'
            }),
            disabled: isTrailing,
            tabIndex: isTrailing ? -1 : 0,
            'aria-disabled': isTrailing,
            appearance: 'subtle',
            ...buttonProps,
            onClick: useEventCallback(mergeCallbacks(handleClick, props.onClick))
        }, useMergedRefs(ref, buttonRef))
    };
};