/**
 * Minerva CSS Custom properties
 * ----------------------------
 * Please be aware that these properties are accessible via *any* client-side code.
 * These variables should mirror Codex design token names and values:
 * https://doc.wikimedia.org/codex/latest/design-tokens
 * Only include properties that are required for client-side modification.
 *
 * @private - Currently, these variables are only intended for use by Minerva,
 *            however, they are designed to mimic the naming convention in Codex tokens
 *            in order to facilitate an eventual migration to a centralized source.
 * @experimental
 * @since February 2024 (MediaWiki 1.43)
 */

@import 'mediawiki.skin.variables.less';

// Import CSS variable values from Codex
// TODO in the future this should be managed by MW core instead
@import ( less ) 'mediawiki.skin.codex-design-tokens/theme-codex-wikimedia-experimental.css';
@import 'mediawiki.skin.codex-design-tokens/theme-codex-wikimedia-mode-dark.less';

// :extend merges this :root selector into the one provided by theme-codex-wikimedia-experimental.less.
:root:extend( :root ) {
	// <T361717>FIXME: These can be removed when T361717 is resolved.
	--minerva-diff-addedline: @color-success;
	--minerva-diff-deletedline: @color-destructive;
	// </T361717>
}

/**
* Placeholder Night mode color palette.
* NOTE: These values are temporarily hard coded.
*/
.mixin-night-mode-palette() {
	.cdx-mode-dark();
	// <T361717>FIXME: These can be removed when T361717 is resolved.
	--minerva-diff-deletedline: #886525;
	--minerva-diff-addedline: #36c;
	// </T361717>
}

/**
* == Forced night mode ==
* Applies the night mode color palette per the users explicit preference,
* regardless of system settings.
*/
html.skin-theme-clientpref-night {
	color-scheme: dark;
	.mixin-night-mode-palette();
}

/**
* == Auto night mode ==
* Applies the night mode color palette only in response to system settings.
*/
@media ( prefers-color-scheme: dark ) {
	html.skin-theme-clientpref-os {
		color-scheme: light dark;
		.mixin-night-mode-palette();
	}
}

/**
* == Night-mode helpers ==
* The following classes are provided to help third-parties deal with night mode when using the
* CSS color variables is not feasible.
*
* .skin-invert - This class implements an inverted night-mode effect on applied elements using
*     a CSS filter instead of CSS custom properties. For this effect to work, the light mode palette
*     has to be applied to avoid inverting night-mode colors.
*
* .notheme - This class prevents night mode from being applied to a specific element. It needs the
*     the light mode color palette, and includes an opinionated color: var( --color-base ); rule
*     since the main assumption underlying the light theme is black text.
*/

/* stylelint-disable-next-line block-no-empty */
.skin-invert:extend( :root ),
.notheme:extend( :root ) {
}

.skin-invert,
.notheme {
	color-scheme: light;
	color: var( --color-base );
}

html.skin-theme-clientpref-night .skin-invert {
	filter: invert( 1 ) hue-rotate( 180deg );
}

@media ( prefers-color-scheme: dark ) {
	html.skin-theme-clientpref-os .skin-invert {
		filter: invert( 1 ) hue-rotate( 180deg );
	}
}