// The use of mixins.buttons requires @font-size-base to be defined for this to work in Storybook
@import '../../common/variables.less';
@import '../../common/mixins.less';
@import 'mediawiki.mixins.less';

// Note vector-feature-language-in-header-enabled class is not used here as that class
// only applies to main page.
// This must be limited to vector-page-titlebar as the mw-portlet-lang class is shared with
// the language portlet that can display in the sidebar.
.vector-page-titlebar .mw-portlet-lang {
	// FIXME [review whether margin-top is needed] center vertically in heading.
	margin-top: 2px;
	box-sizing: border-box;
	height: @height-button-lang;
	flex-shrink: 0;

	// The language button is a BUTTON ICON not a standalone ICON so different rules apply
	// It might make sense to have a mw-ui-icon-flush-right-button class in core to replace this.
	&.mw-ui-icon-flush-right {
		// This number should be synced with the value in:
		// https://github.com/wikimedia/mediawiki/blob/master/resources/src/mediawiki.less/mediawiki.ui/mixins.buttons.less#L33
		margin-right: -12px;
	}

	// If there are no languages and JavaScript is not enabled there is no fallback so we hide
	// the button altogether.
	.mw-portlet-lang-heading-0 {
		.client-nojs & {
			display: none;
		}
	}

	.vector-menu-heading {
		// Prevent select of span text "X languages"
		user-select: none;
		// Remove opacity on language button (it applies to more menu because of label color).
		opacity: 1;

		.vector-menu-heading-label {
			// Special treatment for language button, based on Vector font-size
			font-size: @font-size-base;
		}

		// T291286: Temporarily use progressive ULS style
		&.mw-ui-progressive.mw-ui-quiet {
			.mw-ui-icon:before {
				// Ensure inverted language icon is white
				opacity: 1;
			}

			&:after {
				// Invert arrow color
				background-image: url( ../common/images/arrow-down-progressive.svg );
				opacity: 1;
			}
		}
	}

	input:active + .vector-menu-heading {
		&.mw-ui-progressive.mw-ui-quiet {
			.mw-ui-icon {
				// stylelint-disable-next-line plugin/no-unsupported-browser-features
				filter: brightness( 0 ) invert( 1 );
			}

			&:after {
				background-image: url( ../common/images/arrow-down-invert.svg );
			}
		}
	}

	// The `vector-menu-content` class is present twice in current implementation of language switcher
	// (see FIXME in Dropdown/Open.mustache) so it is important we target the direct child.
	> .vector-menu-content {
		top: auto;
		left: -@border-width-base;
		right: -@border-width-base;
		// align borders of open menu align with button
		box-sizing: border-box;
		max-height: 65vh;
		overflow: auto;

		// Adds to the show/hide technique in Dropdown.less with
		// display to prevent rendering and long scrolling on Main page
		display: none;

		li a {
			font-size: inherit;
		}
	}

	.vector-menu-checkbox:checked ~ .vector-menu-content {
		display: block;
	}

	.after-portlet {
		// ensure there is a visual separation between the language links and additional links.
		margin-top: 10px;
	}

	// styles for less prominent Language button (without label) to be used for non-content pages (see T316559)
	.mw-portlet-lang-heading-empty + .vector-menu-content {
		left: auto;
		right: 0;
		min-width: 300px;

		.mw-portlet-empty-language-selector-body {
			padding: 20px;
			border-bottom: @border-style-base @border-width-base @border-color-portal-heading;
			color: @color-base--subtle;
		}
	}
}

// Hides language button with CSS, ensures language button is in DOM for temporary JS hack for interwiki links
// Temporary solution to T287206, can be removed when ULS dialog includes interwiki links
#p-lang-btn.mw-portlet-empty {
	display: none;
}

.mw-interlanguage-selector {
	display: flex;

	&:after {
		.mixin-vector-menu-heading-arrow();
	}
}

// Hide the "Add languages" on pages which are not action=view where there are 0 languages
.vector-dropdown > .vector-menu-heading.mw-portlet-lang-heading-0 {
	display: none;
}

// Show it on view pages where there are 0 languages so user can add languages (JavaScript required)
.client-js .action-view .vector-dropdown > .vector-menu-heading.mw-portlet-lang-heading-0 {
	display: flex;
}