// color-mixins.less
//
// Mixins specifically dependent on theme colors.
// Shortcuts for easily getting consistent colorization rules onto components.
//

@import "./mixins.less";

// ---------------------------------------
// Focus Shadow and background setup
// ---------------------------------------
.sand-bg-colors (@bg) {
	//// Relocate the bg styling to a pseudo-element
	// &::after {
		@bg();
	// }
}
// .sand-shadow-colors (@shadow) {
// 	// &::before {
// 		@shadow();
// 	// }
// }

// Establish rules assignment for before focus has happened
.sand-spotlight-resting-bg-colors (@opacity: 0, @bg: {}, @shadow: {}) {
	// These lines are really long, and occasionally repeated. Defining here as shorthand.
	// @transition-opacity: opacity @sand-spotlight-focus-animation-duration ease-out;
	// @transition-transform: transform @sand-spotlight-focus-animation-duration ease-out;
	// @transition-filter: filter @sand-spotlight-focus-animation-duration ease-out;

	opacity: @opacity;
	// transition+: @transition-opacity;
	// will-change+: opacity;

	// Prep common aspects
	// @pseudo-element-setup: {
	// 	content: "";
	// 	position: absolute;
	// 	.position(0);
	// 	border-radius: inherit;
	// };

	// // Shadow
	// .sand-shadow-colors({
	// 	@pseudo-element-setup();
	// 	background-color: @sand-spotlight-bg-color;
	// 	opacity: 0;

	// 	// filter+: drop-shadow(@sand-spotlight-focus-shadow);
	// 	box-shadow: @sand-spotlight-focus-shadow;

	// 	//// Include a transform on the shadow for a better effect
	// 	// transform+_: scale(0.9, 0.5); // Hard-coded values, not part of the design. This transform is responsible for tucking the shadow up inside the background so it can transition out.
	// 	// transition+: @transition-opacity, @transition-transform;
	// 	// will-change+: opacity, transition;

	// 	//// Simple opacity change to the shadow (fade-in)
	// 	transition+: @transition-opacity;
	// 	will-change+: opacity;
	// 	will-change+: box-shadow;

	// 	@shadow();
	// });

	// Background coloration
	.sand-bg-colors({
		// @pseudo-element-setup();

		background-color: @sand-spotlight-bg-color;
		// transition+: @transition-filter;
		will-change+: box-shadow;

		@bg();
		@shadow();
	});
}

// Establish rules assignment for after focus has happened
.sand-spotlight-focus-bg-colors (@bg: {}, @shadow: {}) {
	opacity: 1;
	.sand-bg-colors({
		background-color: @sand-spotlight-bg-color;
		box-shadow: @sand-spotlight-focus-shadow;
		@bg();
		@shadow();
	});
}

// // Just the spotlight shadow (merge-safe)
// .sand-spotlight-focus-shadow-colors (@shadow: {}) {
// 	.sand-shadow-colors({
// 		transform: scale(1);
// 		opacity: 1;
// 		box-shadow: @sand-spotlight-focus-shadow;
// 		@shadow();
// 	});
// }

.sand-spotlight-focus-text-colors () {
	// font-weight: @sand-spotlight-font-weight;
	color: @sand-spotlight-text-color;
}

//
// The following 3 mixins should be used inside the `.sand-disabled()` mixin's ruleset.
//

// Assign the standard disabled rules
.sand-disabled-colors () {
	opacity: @sand-disabled-opacity;
}

.sand-disabled-bg-colors () {
	opacity: @sand-disabled-bg-opacity;
}

// Assign the standard disabled rules of content to content nodes.
// This should be used on children of a root component node.
.sand-disabled-focus-content-colors () {
	opacity: @sand-disabled-focus-content-opacity;
}

// Assign the standard disabled rules of backgrounds to bg nodes.
// This should be used on children of a root component node.
.sand-disabled-focus-bg-colors (@bg: {}, @shadow: {}) {
	opacity: @sand-disabled-focus-bg-opacity;

	.sand-bg-colors({
		@bg();
		@shadow();
	});
}

// The technique below is special handling for opaque buttons, which have an opaque
// color defined for the initial background-color. This means we can't use the
// traditional opacity change to animate the difference. Instead, this smoothly applies
// (via transition) a series of filters that match the spotlight-focus bg color. The
// values were manually calculated to perfectly match, taking the resting bg-color and
// adjusting it to become the focus-bg-color. If either color value changes, these
// adjustments must be recalculated. This is not automatic. It may be possible to
// autonomously calculate this in the future...
// Button single-color mixins
.sand-button-resting-bg-color () {
	background-color: @sand-button-bg-color;
}
.sand-button-selected-bg-color () {
	background-color: @sand-button-selected-bg-color;
	filter+_: @sand-button-selected-filter;
}
.sand-button-focus-bg-color () {
	background-color: @sand-button-focus-bg-color;
	filter+_: @sand-button-focus-filter;
}

// Button state mixins
.sand-button-resting-bg-colors (@bg: {}, @shadow: {}) {
	.sand-spotlight-resting-bg-colors(@opacity: 0, @bg: {
		.sand-button-resting-bg-color();
		will-change+: transform, filter;
		transition+: transform @sand-button-focus-duration ease-out;
		@bg();
	}, @shadow);
}

.sand-button-selected-colors (@bg: {}, @shadow: {}) {
	.sand-bg-colors({
		.sand-button-selected-bg-color();
		@bg();
		@shadow();
	});
}

.sand-button-focus-bg-colors (@bg: {}, @shadow: {}) {
	.sand-spotlight-focus-bg-colors(@bg: {
		.sand-button-focus-bg-color();
		@bg();
	}, @shadow);
}