resources/src/mediawiki.rcfilters/styles/mw.rcfilters.mixins.less
@import 'mediawiki.skin.variables.less';
@import 'mw.rcfilters.variables.less';
@import 'mediawiki.mixins.less';

/* stylelint-disable selector-class-pattern */

// Circle mixin
.mw-rcfilters-circle( @min-size-diameter: @min-size-circle, @size-diameter: @size-circle, @margin: 0.5em ) {
	box-sizing: border-box;
	min-width: @min-size-diameter;
	width: @size-diameter;
	min-height: @min-size-diameter;
	height: @size-diameter;
	margin: @margin;
	border-radius: @border-radius-circle;
}

// Circle color mixin
.mw-rcfilters-circle-color( @param-background-color: @background-color-base, @param-border: false, @param-border-color: #54595d, @param-empty-background: false ) {
	& when ( @param-empty-background = false ) {
		background-color: @param-background-color;
	}

	& when ( @param-empty-background = true ) {
		background-color: @highlight-none;
	}

	& when ( @param-border = true ) {
		border: @border-width-base @border-style-base @param-border-color;
	}
}

// This is the circle that appears next to the results
// Its visibility is directly dependent on whether there is
// a color class on its parent element
.result-circle( @colorName: 'none' ) {
	&-@{colorName} {
		display: none;
		.mw-rcfilters-circle-color( ~'@{highlight-@{colorName}}' );

		.mw-rcfilters-highlight-color-@{colorName} & {
			display: inline-block;
		}
	}
}

// A mixin for changes list containers. Applies enough margin-left to fit the 5 highlight circles.
.result-circle-margin() {
	margin-left: ~'calc( ( @{size-circle-result} + @{margin-circle-result} ) * 5 + @{margin-circle} )';
}

.background-color-with-dark-mode( @bgcolor ) {
	background-color: @bgcolor;

	html.skin-theme-clientpref-night & {
		background-color: darken( @bgcolor, 70% );
	}

	/**
	 * Auto night mode.
	 *
	 * Applies the night mode color palette only in response to system settings.
	 */
	/* stylelint-disable-next-line plugin/no-unsupported-browser-features */
	@media ( prefers-color-scheme: dark ) {
		html.skin-theme-clientpref-os & {
			background-color: darken( @bgcolor, 70% );
		}
	}
}

// A mixin just for changesListWrapperWidget page, to output the scope of the widget
// so it is before the rest of the rule; we need the li& to be in
// between the wrapper scope and the color-cX class, which doesn't
// work if the rules are inside the above widget LESS scope
.highlight-results( @bgcolor ) {
	.mw-rcfilters-ui-changesListWrapperWidget li&,
	.mw-rcfilters-ui-changesListWrapperWidget & tr:first-child,
	.mw-rcfilters-ui-changesListWrapperWidget tr&.mw-rcfilters-ui-highlights-enhanced-toplevel:not( .mw-rcfilters-ui-changesListWrapperWidget-enhanced-grey ) td:not( :nth-child( -n+2 ) ),
	.mw-rcfilters-ui-changesListWrapperWidget tr&.mw-rcfilters-ui-highlights-enhanced-nested:not( .mw-rcfilters-ui-changesListWrapperWidget-enhanced-grey ) td:not( :nth-child( -n+4 ) ) {
		.background-color-with-dark-mode( @bgcolor );
	}
}

// This mixin produces color mixes for two, three and four colors
.highlight-color-mix( @color1, @color2, @color3: false, @color4: false ) {
	@highlight-color-class-var: ~'.mw-rcfilters-highlight-color-@{color1}.mw-rcfilters-highlight-color-@{color2}';

	// The nature of these variables and them being inside
	// a 'tint' and 'average' LESS functions is such where
	// the parsing is failing if it is done inside those functions.
	// Instead, we first construct their LESS variable names,
	// and then we call them inside those functions by calling @@var
	@c1var: ~'highlight-@{color1}';
	@c2var: ~'highlight-@{color2}';

	// Two colors
	@{highlight-color-class-var} when ( @color3 = false ) and ( @color4 = false ) and not ( @color1 = false ), ( @color2 = false ) {
		.highlight-results( tint( average( @@c1var, @@c2var ), 50% ) );
	}
	// Three colors
	@{highlight-color-class-var}.mw-rcfilters-highlight-color-@{color3} when ( @color4 = false ) and not ( @color3 = false ) {
		@c3var: ~'highlight-@{color3}';
		.highlight-results( tint( mix( @@c1var, average( @@c2var, @@c3var ), 33% ), 30% ) );
	}

	// Four colors
	@{highlight-color-class-var}.mw-rcfilters-highlight-color-@{color3}.mw-rcfilters-highlight-color-@{color4} when not ( @color4 = false ) {
		@c3var: ~'highlight-@{color3}';
		@c4var: ~'highlight-@{color4}';
		.highlight-results( tint( mix( @@c1var, mix( @@c2var, average( @@c3var, @@c4var ), 25% ), 25% ), 25% ) );
	}
}
