# All files / src/components/display Tooltip.tsx

97.26% Statements 71/73
86.66% Branches 26/30
100% Functions 12/12
97.26% Lines 71/73

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     import {
      cloneElement,
      isValidElement,
      useCallback,
      useEffect,
      useId,
      useRef,
      useState,
      type JSX,
      type ReactElement,
      type ReactNode,
    } from "react";
    import { createPortal } from "react-dom";
    import { type TooltipBuiltinProps, type TooltipPlacement } from "@grackle-ai/common";
    import styles from "./Tooltip.module.scss";

    // `text`/`placement`/`delayMs` now live in the built-in's zod schema
    // (@grackle-ai/common); re-export TooltipPlacement so the package barrel keeps
    // exposing it.
    export type { TooltipPlacement };

    /** Props for the {@link Tooltip} component. */
    export interface TooltipProps extends TooltipBuiltinProps {
      /** Whether the wrapper is inline (`span`) or block (`div`). Defaults to `true`. */
      inline?: boolean;
      /** The trigger element to wrap. */
      children: ReactNode;
      /** Additional CSS class for the wrapper element. */
      className?: string;
      /** Test ID for the tooltip content element. */
      "data-testid"?: string;
    }

    /** Default delay in milliseconds before the tooltip appears. */
    const DEFAULT_DELAY_MS: number = 300;

    /** Gap in pixels between the tooltip and the trigger element. */
    const TOOLTIP_GAP_PX: number = 6;

    /**
     * Lightweight tooltip wrapper that shows text on hover or keyboard focus.
     *
     * Wraps a single child element with a hover/focus-triggered tooltip.
     * Renders the tooltip bubble via a portal to `document.body` so it escapes
     * all stacking contexts, `overflow: hidden`, and `backdrop-filter` traps.
     */
    export function Tooltip({
      text,
      placement = "top",
      delayMs = DEFAULT_DELAY_MS,
      inline = true,
      children,
      className,
      "data-testid": testId,
    }: TooltipProps): JSX.Element {
      const [visible, setVisible] = useState(false);
      const [coords, setCoords] = useState<{ top: number; left: number }>({ top: 0, left: 0 });
      const wrapperRef = useRef<HTMLElement>(null);
      const tooltipRef = useRef<HTMLDivElement>(null);
      const timerRef = useRef<ReturnType<typeof setTimeout> | undefined>(undefined);
      const tooltipId = useId();

      const canPortal = typeof document !== "undefined";

      const computePosition = useCallback((): void => {
        Iif (!wrapperRef.current || !tooltipRef.current) {
          return;
        }
        const rect = wrapperRef.current.getBoundingClientRect();
        const tipRect = tooltipRef.current.getBoundingClientRect();
        let top = 0;
        let left = 0;
        switch (placement) {
          case "top":
            top = rect.top - tipRect.height - TOOLTIP_GAP_PX;
            left = rect.left + rect.width / 2 - tipRect.width / 2;
            break;
          case "bottom":
            top = rect.bottom + TOOLTIP_GAP_PX;
            left = rect.left + rect.width / 2 - tipRect.width / 2;
            break;
          case "left":
            top = rect.top + rect.height / 2 - tipRect.height / 2;
            left = rect.left - tipRect.width - TOOLTIP_GAP_PX;
            break;
          case "right":
            top = rect.top + rect.height / 2 - tipRect.height / 2;
            left = rect.right + TOOLTIP_GAP_PX;
            break;
        }
        setCoords({ top, left });
      }, [placement]);

      const showWithDelay = useCallback(
        (delay: number): void => {
          if (timerRef.current !== undefined) {
            clearTimeout(timerRef.current);
          }
          timerRef.current = setTimeout(() => {
            computePosition();
            setVisible(true);
            timerRef.current = undefined;
          }, delay);
        },
        [computePosition],
      );

      const showHover = useCallback((): void => {
        showWithDelay(delayMs);
      }, [delayMs, showWithDelay]);
      const showFocus = useCallback((): void => {
        showWithDelay(0);
      }, [showWithDelay]);

      const hide = useCallback((): void => {
        if (timerRef.current !== undefined) {
          clearTimeout(timerRef.current);
          timerRef.current = undefined;
        }
        setVisible(false);
      }, []);

      // Dismiss on Escape key; reposition on scroll/resize while visible.
      useEffect(() => {
        if (!visible) {
          return;
        }
        const handleKeyDown = (event: KeyboardEvent): void => {
          if (event.key === "Escape") {
            hide();
          }
        };
        document.addEventListener("keydown", handleKeyDown);
        window.addEventListener("scroll", computePosition, true);
        window.addEventListener("resize", computePosition);
        return () => {
          document.removeEventListener("keydown", handleKeyDown);
          window.removeEventListener("scroll", computePosition, true);
          window.removeEventListener("resize", computePosition);
        };
      }, [visible, hide, computePosition]);

      // Cleanup timer on unmount
      useEffect(() => {
        return () => {
          Iif (timerRef.current !== undefined) {
            clearTimeout(timerRef.current);
          }
        };
      }, []);

      const Tag = inline ? "span" : "div";
      const wrapperClass = [inline ? styles.wrapper : styles.wrapperBlock, className]
        .filter(Boolean)
        .join(" ");

      // Inject aria-describedby onto the child element when it is a single
      // ReactElement so screen readers announce the tooltip from the focused node.
      // Merges with any existing aria-describedby value on the child.
      let renderedChildren: React.ReactNode = children;
      if (isValidElement(children)) {
        const child = children as ReactElement<{ "aria-describedby"?: string }>;
        const existing = child.props["aria-describedby"];
        const mergedDescribedBy = visible
          ? existing
            ? `${existing} ${tooltipId}`
            : tooltipId
          : existing;
        renderedChildren = cloneElement(child, {
          "aria-describedby": mergedDescribedBy,
        });
      }

      const tooltipElement = (
        <div
          ref={tooltipRef}
          id={tooltipId}
          role="tooltip"
          className={`${styles.tooltip} ${styles[placement]} ${visible ? styles.visible : ""}`}
          style={{ top: coords.top, left: coords.left }}
          data-testid={testId ?? "tooltip"}
        >
          {text}
        </div>
      );

      return (
        <Tag
          ref={wrapperRef as React.Ref<HTMLSpanElement & HTMLDivElement>}
          className={wrapperClass}
          onMouseEnter={showHover}
          onMouseLeave={hide}
          onFocus={showFocus}
          onBlur={hide}
        >
          {renderedChildren}
          {canPortal ? createPortal(tooltipElement, document.body) : null}
        </Tag>
      );
    }