/**
 * Copyright IBM Corp. 2020, 2026
 *
 * This source code is licensed under the Apache-2.0 license found in the
 * LICENSE file in the root directory of this source tree.
 */

import { __toESM } from "../../_virtual/_rolldown/runtime.js";
import { require_classnames } from "../../node_modules/classnames/index.js";
import { pkg } from "../../settings.js";
import { useIsomorphicEffect } from "../../global/js/hooks/useIsomorphicEffect.js";
import { getDevtoolsProps } from "../../global/js/utils/devtools.js";
import { ScrollStates, useIsOverflow } from "./constants.js";
import React, { useEffect, useRef, useState } from "react";
import PropTypes from "prop-types";
import { usePrefix } from "@carbon/react";

//#region src/components/ScrollGradient/ScrollGradient.jsx
/**
* Copyright IBM Corp. 2024, 2025
*
* This source code is licensed under the Apache-2.0 license found in the
* LICENSE file in the root directory of this source tree.
*/
var import_classnames = /* @__PURE__ */ __toESM(require_classnames());
const blockClass = `${pkg.prefix}--scroll-gradient`;
const componentName = "ScrollGradient";
const defaults = {
	hideStartGradient: false,
	onScroll: () => {},
	getScrollElementRef: () => {}
};
/**
* TODO: A description of the component.
*/
let ScrollGradient = React.forwardRef(({ children, className, color, onScroll = defaults.onScroll, scrollElementClassName, getScrollElementRef = defaults.getScrollElementRef, hideStartGradient = defaults.hideStartGradient, ...rest }, ref) => {
	const intersectionStartRef = useRef(void 0);
	const intersectionEndRef = useRef(void 0);
	const intersectionLeftRef = useRef(void 0);
	const intersectionRightRef = useRef(void 0);
	const fallbackColor = `var(--${usePrefix()}-layer-01)`;
	const scrollContainer = useRef(void 0);
	const contentChildrenContainer = useRef(void 0);
	const { xScrollable, yScrollable } = useIsOverflow(scrollContainer);
	const gradientRight = yScrollable && scrollContainer.current && contentChildrenContainer.current ? scrollContainer.current.offsetWidth - contentChildrenContainer.current.offsetWidth : 0;
	const gradientBottom = xScrollable && scrollContainer.current && contentChildrenContainer.current ? scrollContainer.current.offsetHeight - contentChildrenContainer.current.offsetHeight : 0;
	const [verticalPosition] = useState(ScrollStates.NONE);
	const [horizontalPosition] = useState(ScrollStates.NONE);
	const startVerticalRef = useRef(null);
	const startHorizontalRef = useRef(null);
	const endVerticalRef = useRef(null);
	const endHorizontalRef = useRef(null);
	useIsomorphicEffect(() => {
		startVerticalRef.current.style.right = gradientRight;
		startVerticalRef.current.style.backgroundImage = `linear-gradient(0deg, transparent, ${color ?? fallbackColor} 90%)`;
		startHorizontalRef.current.backgroundImage = `linear-gradient(-90deg, transparent, ${color ?? fallbackColor} 90%)`;
		startHorizontalRef.current.bottom = gradientBottom;
		endVerticalRef.current.style.right = gradientRight;
		endVerticalRef.current.style.bottom = gradientBottom;
		endVerticalRef.current.style.backgroundImage = `linear-gradient(0deg, ${color ?? fallbackColor} 10%, transparent)`;
		endHorizontalRef.current.style.right = gradientRight;
		endHorizontalRef.current.style.bottom = gradientBottom;
		endHorizontalRef.current.style.backgroundImage = `linear-gradient(-90deg, ${color ?? fallbackColor} 10%, transparent)`;
	}, [
		color,
		gradientRight,
		gradientBottom
	]);
	const setGradientOnIntersection = (entry, gradientRef) => {
		if (gradientRef.current) if (entry.isIntersecting) {
			gradientRef.current.style.opacity = 0;
			gradientRef.current.style.display = "none";
			gradientRef?.current.setAttribute("aria-hidden", false);
		} else {
			gradientRef.current.style.opacity = 1;
			gradientRef.current.style.display = "block";
			gradientRef?.current.setAttribute("aria-hidden", true);
		}
	};
	useEffect(() => {
		const observer = new IntersectionObserver((entries) => {
			entries.forEach((entry) => {
				if (entry.target.hasAttribute("data-start-vertical")) setGradientOnIntersection(entry, startVerticalRef);
				if (entry.target.hasAttribute("data-end-vertical")) setGradientOnIntersection(entry, endVerticalRef);
				if (entry.target.hasAttribute("data-start-horizontal")) setGradientOnIntersection(entry, startHorizontalRef);
				if (entry.target.hasAttribute("data-end-horizontal")) setGradientOnIntersection(entry, endHorizontalRef);
			});
		}, {
			root: null,
			rootMargin: "0px",
			threshold: .1
		});
		observer.observe(intersectionStartRef.current);
		observer.observe(intersectionEndRef.current);
		observer.observe(intersectionLeftRef.current);
		observer.observe(intersectionRightRef.current);
		const startVerticalRefValue = intersectionStartRef.current;
		const endVerticalRefValue = intersectionEndRef.current;
		const startHorizontalRefValue = intersectionLeftRef.current;
		const endHorizontalRefValue = intersectionRightRef.current;
		return () => {
			observer.unobserve(startVerticalRefValue);
			observer.unobserve(endVerticalRefValue);
			observer.unobserve(startHorizontalRefValue);
			observer.unobserve(endHorizontalRefValue);
		};
	}, []);
	const setRefs = (element) => {
		scrollContainer.current = element;
		getScrollElementRef(element);
	};
	return /* @__PURE__ */ React.createElement("div", {
		...rest,
		className: (0, import_classnames.default)(blockClass, `${blockClass}--x-${horizontalPosition.toLowerCase()}`, `${blockClass}--y-${verticalPosition.toLowerCase()}`, {
			[`${blockClass}--x-scrollable`]: xScrollable,
			[`${blockClass}--y-scrollable`]: yScrollable
		}, className),
		ref,
		role: "presentation",
		...getDevtoolsProps(componentName)
	}, /* @__PURE__ */ React.createElement("div", {
		onScroll,
		ref: setRefs,
		className: (0, import_classnames.default)(`${blockClass}__content`, scrollElementClassName)
	}, /* @__PURE__ */ React.createElement("span", {
		ref: intersectionStartRef,
		"data-start-vertical": true
	}), /* @__PURE__ */ React.createElement("span", {
		ref: intersectionLeftRef,
		"data-start-horizontal": true
	}), /* @__PURE__ */ React.createElement("div", {
		ref: contentChildrenContainer,
		className: `${blockClass}__content-children`
	}, children), /* @__PURE__ */ React.createElement("span", {
		ref: intersectionEndRef,
		"data-end-vertical": true
	}), /* @__PURE__ */ React.createElement("span", {
		ref: intersectionRightRef,
		"data-end-horizontal": true
	})), !hideStartGradient && /* @__PURE__ */ React.createElement(React.Fragment, null, /* @__PURE__ */ React.createElement("div", {
		ref: startVerticalRef,
		className: `${blockClass}__start-vertical`,
		role: "presentation",
		"aria-hidden": true
	}), /* @__PURE__ */ React.createElement("div", {
		ref: startHorizontalRef,
		className: `${blockClass}__start-horizontal`,
		role: "presentation",
		"aria-hidden": true
	})), /* @__PURE__ */ React.createElement("div", {
		ref: endVerticalRef,
		className: `${blockClass}__end-vertical`,
		role: "presentation",
		"aria-hidden": true
	}), /* @__PURE__ */ React.createElement("div", {
		ref: endHorizontalRef,
		className: `${blockClass}__end-horizontal`,
		role: "presentation",
		"aria-hidden": true
	}));
});
ScrollGradient = pkg.checkComponentEnabled(ScrollGradient, componentName);
ScrollGradient.displayName = componentName;
ScrollGradient.propTypes = {
	children: PropTypes.oneOfType([PropTypes.arrayOf(PropTypes.node), PropTypes.node]),
	className: PropTypes.string,
	color: PropTypes.string,
	getScrollElementRef: PropTypes.func,
	hideStartGradient: PropTypes.bool,
	onScroll: PropTypes.func,
	scrollElementClassName: PropTypes.string
};

//#endregion
export { ScrollGradient };