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

#vector-toc-collapsed-button {
	display: none;
	float: left;
	margin-right: 4px;
	margin-left: -@icon-padding-md;
	// Reduce padding to fit with page title
	padding: 7px 10px 7px 10px;
	// 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;
	}
}

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

// Override button styles for the "move to sidebar/hide" links. Default hide.
.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;
	}
}

// Applies when TOC is collapsed in it's original DOM location
// Doesn't apply to the collapsed TOC in the sticky header
.mixin-toc-collapsed-unmoved() {
	#vector-toc-collapsed-button {
		display: block;
	}

	.mw-table-of-contents-container {
		position: relative;

		.vector-layout-legacy & {
			// !important needed to override rules in screen.less
			top: 0 !important; /* stylelint-disable-line declaration-no-important */
		}
	}

	@{sidebar-toc-selector} {
		display: none;
		position: absolute;
		margin: 0;
		// 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} ~ @{sidebar-toc-selector} {
		// Hide the TOC when the button is not checked
		display: block;
	}
}

.mixin-toc-collapsed-floating() {
	#vector-toc-collapsed-button,
	.sidebar-toc {
		position: fixed;
	}

	#vector-toc-collapsed-button {
		top: 0;
		left: 0;
		margin: 0;
	}

	.sidebar-toc {
		top: @height-collapsed-toc-button; // TOC button height
		left: 6px;
	}
}

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

	@{sidebar-toc-selector} {
		top: ~'calc(@{height-collapsed-toc-button} + @{padding-top-content-px})'; // 44px
		left: -4px;
	}

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

@media ( min-width: @min-width-desktop ) {
	@supports ( display: grid ) {
		.client-js {
			// Collapsed to page title
			.vector-toc-collapsed .vector-layout-grid {
				.mixin-toc-collapsed-unmoved();

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

				@{sidebar-toc-selector} {
					top: ~'calc(@{height-collapsed-toc-button} + @{padding-top-content-px})'; // 44px
					left: -@icon-padding-md;
				}

				// Collapsed to floating icon
				// when sticky header not visible and below page title
				body:not( .vector-sticky-header-visible ).vector-below-page-title& {
					.mixin-toc-collapsed-floating();
				}
			}

			.vector-toc-collapsed {
				.vector-toc-uncollapse-button {
					display: inline-block;
				}
			}

			body:not( .vector-toc-collapsed ) {
				.vector-toc-collapse-button {
					display: inline-block;
				}
			}
		}
	}
}