@import '../../common/variables.less';
@import '../../common/mixins.less';

@height-collapsed-toc-button: 36px;
@padding-top-content-px: unit( @padding-top-content * @font-size-browser, px );
@selector-collapsed-toc-open: ~'#vector-toc-collapsed-checkbox:checked';
// Use calc so that the same max width can apply even when the TOC is in different containers
@max-width-collapsed-toc: 0.85 * @max-width-content-container; // 51em

#vector-toc-collapsed-button {
	display: none;
	float: left;
	margin-right: 4px;
	// Override background color for when the TOC is overlaps content
	// as a sticky element when the page is scrolled down.
	background-color: @background-color-base;

	&:hover,
	&:active {
		background-color: @colorGray15;
	}

	// Override the default button styles so the ToC button is slightly shorter when collapsed into the page title
	@media ( max-width: @max-width-tablet ) {
		padding: 7px 12px;
	}
}

#vector-toc-collapsed-button,
.sidebar-toc {
	z-index: @z-index-menu;
}

.ve-active {
	#vector-toc-collapsed-button {
		display: none !important; /* stylelint-disable-line declaration-no-important */
	}
}

// Styles for the "move to sidebar/hide" buttons, hidden by default.
// FIXME: Remove entire selector when I82f23e69b0249c844af9e45fec342217a0755893 has been in prod for a week
.vector-toc-collapse-button,
.vector-toc-uncollapse-button {
	display: none;
	border: 0;
	padding: 0;
	background-color: transparent;
	color: @color-primary;
	cursor: pointer;

	&:hover {
		color: @color-primary--hover;
	}

	&:before {
		content: '@{msg-brackets-start}';
		color: @color-base--subtle;
	}

	&:after {
		content: '@{msg-brackets-end}';
		color: @color-base--subtle;
	}
}

// Hide pin ToC toggles on smaller resolutions
@media ( max-width: @max-width-tablet ) {
	.sidebar-toc .vector-pinnable-header-toggle-button {
		display: none;
	}
}

// Shared collapsed TOC styles, applies across all collapsed cases (header, floating, sticky header)
.mixin-toc-collapsed() {
	// T316056 Remove TOC menu fixed width and apply min/max-width
	// using min() so that the TOC menu doesn't fully cover the text even on small viewports
	width: auto;
	margin-left: 0;
	margin-right: 0;
	min-width: 200px;
	max-width: ~'min( @{max-width-collapsed-toc}, 75vw )'; // 51em
}

// TOC styles when collapsed to header
.mixin-toc-collapsed-header() {
	#vector-toc-collapsed-button {
		display: block;
	}

	// FIXME: Remove .vector-sticky-toc-container selector after I85aec387f87126a17e760fd9fd10e10572ff3152 has been in prod for 5 days
	.vector-sticky-toc-container,
	#vector-toc-pinned-container {
		// Override TOC container's sticky positioning
		position: relative;
	}

	.sidebar-toc {
		.mixin-toc-collapsed();
		display: none;
		position: absolute;
		top: @height-collapsed-toc-button; // TOC button height
		// FIXME: Don't use a magic number. This used to be tied to the private variable in core
		// @icon-padding-md so perhaps this needs to make use of the flush classes?
		left: -12px;
		margin-top: @padding-top-content-px; // Account for padding-top from .mw-body
		// FIXME: Collapsed TOC styles are not consistent with other vector dropdowns
		border: @border-width-base @border-style-base @border-color-base;
	}

	@{selector-collapsed-toc-open} ~ .mw-table-of-contents-container .sidebar-toc {
		// Hide the TOC when the button is not checked
		display: block;
	}
}

// TOC styles when collapsed to floating button
.mixin-toc-collapsed-floating() {
	#vector-toc-collapsed-button {
		position: fixed;
		top: 0;
		left: 0;
		margin: 0;
	}

	.sidebar-toc {
		.mixin-toc-collapsed();
		position: fixed;
		left: 6px;
	}
}

@media ( max-width: @max-width-tablet ) {
	//
	// Collapsed to header on narrow screens
	//
	.mixin-toc-collapsed-header();

	//
	// Collapsed to floating button on narrow screens when below page title
	//
	.vector-below-page-title {
		.mixin-toc-collapsed-floating();
	}
}

@media ( min-width: @min-width-desktop ) {
	@supports ( display: grid ) {
		.client-js {
			.vector-toc-unpinned:not( .vector-sticky-header-visible ) {
				//
				// Collapsed to header
				//
				.mixin-toc-collapsed-header();

				.mw-table-of-contents-container {
					grid-area: pageContent;
				}

				//
				// Collapsed to floating icon when below page title
				//
				.vector-below-page-title& {
					.mixin-toc-collapsed-floating();
				}
			}

			// Align with vector-toc-collapsed-button which uses core flush classes
			// using temporary hardcoded value.
			// FIXME: Remove this entire selector as part of T318013
			.vector-toc-unpinned:not( .vector-sticky-header-visible ) .sidebar-toc {
				@media ( min-width: @width-breakpoint-desktop ) {
					// Copied from mediawiki.ui.icons,
					// (Ifccaadabd72a12814d3d4d01200931f7254c6cd5)
					// but converted to px to match `mw-ui-button`
					left: -5px;
				}
			}

			// Show the "move to sidebar/hide" buttons
			.vector-toc-unpinned .vector-toc-uncollapse-button,
			.vector-toc-pinned .vector-toc-collapse-button {
				display: inline-block;
			}
		}
	}
}

//
// Collapsed to sticky header
//
.vector-toc-unpinned .vector-sticky-header-toc-container .sidebar-toc {
	.mixin-toc-collapsed();
	// T316056 Use max-content because collapsed TOC is absolutely positioned, width is relative to the collapsed TOC button
	// max-content doesn't account for padding even when we use box-sizing, so use content-box instead
	// and manually account for horizontal padding in the max width
	box-sizing: content-box;
	width: max-content;
	@sidebar-toc-left-padding-em: unit( @sidebar-toc-left-padding / @font-size-browser, em );
	@sidebar-toc-right-padding-em: unit( @sidebar-toc-right-padding / @font-size-browser, em );

	@max-width-sticky-header-collapsed-toc: @max-width-collapsed-toc - @sidebar-toc-right-padding-em;
	max-width: ~'min( @{max-width-sticky-header-collapsed-toc}, 75vw )';
}