@import 'mediawiki.mixins';
@import 'mediawiki.ui/variables';
@import 'mw.rcfilters.variables';

.animation-delay( ... ) {
	-webkit-animation-delay: @arguments; // Chrome 4-42, Safari 4-8, Opera 15-29, Android 2.1-4.4.4
	-moz-animation-delay: @arguments; // Firefox 5-15
	animation-delay: @arguments; // Chrome 43+, Firefox 16+, IE 10+, Edge 12+, Safari 9+, Opera 12.10 & 30+, iOS 9+, Android 47+
}

// This is a general mixin for a color circle
.mw-rcfilters-mixin-circle( @color: @color-base--inverted, @diameter: 2em, @padding: 0.5em, @border: false, @borderColor: @colorGray5, @emptyBackground: false ) {
	.box-sizing( border-box );
	min-width: @diameter;
	width: @diameter;
	min-height: @diameter;
	height: @diameter;
	margin: @padding;
	border-radius: 50%;

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

	& when ( @border = true ) {
		border: 1px solid @borderColor;
	}
}

// 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} {
		.mw-rcfilters-mixin-circle( ~'@{highlight-@{colorName}}', @result-circle-diameter, 0 );
		display: none;

		.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( ( @{result-circle-diameter} + @{result-circle-margin} ) * 5 + @{result-circle-general-margin} )';
}

// 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-changesListWrapperWidget( @bgcolor ) {
	.mw-rcfilters-ui-changesListWrapperWidget li&,
	.mw-rcfilters-ui-changesListWrapperWidget & tr:first-child,
	.mw-rcfilters-ui-changesListWrapperWidget tr&.mw-rcfilters-ui-changesListWrapperWidget-enhanced-toplevel:not( .mw-rcfilters-ui-changesListWrapperWidget-enhanced-grey ) td:not( :nth-child( -n+2 ) ),
	.mw-rcfilters-ui-changesListWrapperWidget tr&.mw-rcfilters-ui-changesListWrapperWidget-enhanced-nested:not( .mw-rcfilters-ui-changesListWrapperWidget-enhanced-grey ) td:not( :nth-child( -n+4 ) ) {
		background-color: @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-changesListWrapperWidget( 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-changesListWrapperWidget( 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-changesListWrapperWidget( tint( mix( @@c1var, mix( @@c2var, average( @@c3var, @@c4var ), 25% ), 25% ), 25% ) );
	}
}
