RocketChat/Rocket.Chat

import { useDebouncedState, useMediaQuery } from '@rocket.chat/fuselage-hooks';
import { TooltipComponent } from '@rocket.chat/ui-client';
import { TooltipContext } from '@rocket.chat/ui-contexts';
import type { FC, ReactNode } from 'react';
import React, { useEffect, useMemo, useRef, memo, useCallback, useState } from 'react';

import TooltipPortal from '../portals/TooltipPortal';

const TooltipProvider: FC = ({ children }) => {
    const lastAnchor = useRef<HTMLElement>();
    const hasHover = !useMediaQuery('(hover: none)');

    const [tooltip, setTooltip] = useDebouncedState<ReactNode>(null, 300);

    const restoreTitle = useCallback((previousAnchor: HTMLElement | undefined): void => {
        setTimeout(() => {
            if (previousAnchor && !previousAnchor.getAttribute('title')) {
                previousAnchor.setAttribute('title', previousAnchor.getAttribute('data-title') ?? '');
                previousAnchor.removeAttribute('data-title');
            }
        }, 0);
    }, []);

    const contextValue = useMemo(
        () => ({
            open: (tooltip: ReactNode, anchor: HTMLElement): void => {
                const previousAnchor = lastAnchor.current;
                setTooltip(<TooltipComponent key={new Date().toISOString()} title={tooltip} anchor={anchor} />);
                lastAnchor.current = anchor;
                previousAnchor && restoreTitle(previousAnchor);
            },
            close: (): void => {
                const previousAnchor = lastAnchor.current;
                setTooltip(null);
                setTooltip.flush();
                lastAnchor.current = undefined;
                previousAnchor && restoreTitle(previousAnchor);
            },
            dismiss: (): void => {
                setTooltip(null);
                setTooltip.flush();
            },
        }),
        [setTooltip, restoreTitle],
    );

    useEffect(() => {
        if (!hasHover) {
            return;
        }

        const handleMouseOver = (e: MouseEvent): void => {
            const target = e.target as HTMLElement;
            if (lastAnchor.current === target) {
                return;
            }

            const anchor = target.closest('[title], [data-tooltip]') as HTMLElement;

            if (lastAnchor.current === anchor) {
                return;
            }

            if (!anchor) {
                contextValue.close();
                return;
            }

            const title = anchor.getAttribute('title') ?? anchor.getAttribute('data-tooltip') ?? '';
            if (!title) {
                contextValue.close();
                return;
            }

            // eslint-disable-next-line react/no-multi-comp
            const Handler = () => {
                const [state, setState] = useState(title);
                useEffect(() => {
                    const close = (): void => contextValue.close();
                    // store the title in a data attribute
                    anchor.setAttribute('data-title', title);
                    // Removes the title attribute to prevent the browser's tooltip from showing
                    anchor.setAttribute('title', '');

                    anchor.addEventListener('mouseleave', close);

                    const observer = new MutationObserver(() => {
                        const title = anchor.getAttribute('title') ?? anchor.getAttribute('data-tooltip') ?? '';

                        if (title === '') {
                            return;
                        }

                        // store the title in a data attribute
                        anchor.setAttribute('data-title', title);
                        // Removes the title attribute to prevent the browser's tooltip from showing
                        anchor.setAttribute('title', '');

                        setState(title);
                    });

                    observer.observe(anchor, {
                        attributes: true,
                        attributeFilter: ['title', 'data-tooltip'],
                    });

                    return () => {
                        anchor.removeEventListener('mouseleave', close);
                        observer.disconnect();
                    };
                }, []);
                return <>{state}</>;
            };
            contextValue.open(<Handler />, anchor);
        };

        const dismissOnClick = (): void => {
            contextValue.dismiss();
        };

        document.body.addEventListener('mouseover', handleMouseOver, {
            passive: true,
        });
        document.body.addEventListener('click', dismissOnClick, { capture: true });

        return (): void => {
            contextValue.close();
            document.body.removeEventListener('mouseover', handleMouseOver);
            document.body.removeEventListener('click', dismissOnClick);
        };
    }, [contextValue, setTooltip, hasHover]);

    return (
        <TooltipContext.Provider value={contextValue}>
            {children}
            {tooltip && <TooltipPortal>{tooltip}</TooltipPortal>}
        </TooltipContext.Provider>
    );
};

export default memo<typeof TooltipProvider>(TooltipProvider);