<?php

/**

 * Style engine: Public functions

 *

 * This file contains a variety of public functions developers can use to interact with

 * the Style Engine API.

 *

 * @package WordPress

 * @subpackage StyleEngine

 * @since 6.1.0

 */

/**

 * Global public interface method to generate styles from a single style object,

 * e.g. the value of a block's attributes.style object or the top level styles in theme.json.

 *

 * Example usage:

 *

 *     $styles = wp_style_engine_get_styles(

 *         array(

 *             'color' => array( 'text' => '#cccccc' ),

 *         )

 *     );

 *

 * Returns:

 *

 *     array(

 *         'css'          => 'color: #cccccc',

 *         'declarations' => array( 'color' => '#cccccc' ),

 *         'classnames'   => 'has-color',

 *     )

 *

 * @since 6.1.0

 *

 * @see https://developer.wordpress.org/block-editor/reference-guides/theme-json-reference/theme-json-living/#styles

 * @see https://developer.wordpress.org/block-editor/reference-guides/block-api/block-supports/

 *

 * @param array $block_styles The style object.

 * @param array $options {

 *     Optional. An array of options. Default empty array.

 *

 *     @type string|null $context                    An identifier describing the origin of the style object,

 *                                                   e.g. 'block-supports' or 'global-styles'. Default null.

 *                                                   When set, the style engine will attempt to store the CSS rules,

 *                                                   where a selector is also passed.

 *     @type bool        $convert_vars_to_classnames Whether to skip converting incoming CSS var patterns,

 *                                                   e.g. `var:preset|<PRESET_TYPE>|<PRESET_SLUG>`,

 *                                                   to `var( --wp--preset--* )` values. Default false.

 *     @type string      $selector                   Optional. When a selector is passed,

 *                                                   the value of `$css` in the return value will comprise

 *                                                   a full CSS rule `$selector { ...$css_declarations }`,

 *                                                   otherwise, the value will be a concatenated string

 *                                                   of CSS declarations.

 * }

 * @return array {

 *     @type string   $css          A CSS ruleset or declarations block

 *                                  formatted to be placed in an HTML `style` attribute or tag.

 *     @type string[] $declarations An associative array of CSS definitions,

 *                                  e.g. `array( "$property" => "$value", "$property" => "$value" )`.

 *     @type string   $classnames   Classnames separated by a space.

 * }

 */

function wp_style_engine_get_styles( $block_styles, $options = array() ) {

	$options = wp_parse_args(

		$options,

		array(

			'selector'                   => null,

			'context'                    => null,

			'convert_vars_to_classnames' => false,

		)

	);

	$parsed_styles = WP_Style_Engine::parse_block_styles( $block_styles, $options );

	// Output.

	$styles_output = array();

	if ( ! empty( $parsed_styles['declarations'] ) ) {

		$styles_output['css']          = WP_Style_Engine::compile_css( $parsed_styles['declarations'], $options['selector'] );

		$styles_output['declarations'] = $parsed_styles['declarations'];

		if ( ! empty( $options['context'] ) ) {

			WP_Style_Engine::store_css_rule( $options['context'], $options['selector'], $parsed_styles['declarations'] );

		}

	}

	if ( ! empty( $parsed_styles['classnames'] ) ) {

		$styles_output['classnames'] = implode( ' ', array_unique( $parsed_styles['classnames'] ) );

	}

	return array_filter( $styles_output );

}

/**

 * Returns compiled CSS from a collection of selectors and declarations.

 * Useful for returning a compiled stylesheet from any collection of CSS selector + declarations.

 *

 * Example usage:

 *

 *     $css_rules = array(

 *         array(

 *             'selector'     => '.elephant-are-cool',

 *             'declarations' => array(

 *                 'color' => 'gray',

 *                 'width' => '3em',

 *             ),

 *         ),

 *     );

 *

 *     $css = wp_style_engine_get_stylesheet_from_css_rules( $css_rules );

 *

 * Returns:

 *

 *     .elephant-are-cool{color:gray;width:3em}

 *

 * @since 6.1.0

 * @since 6.6.0 Added support for `$rules_group` in the `$css_rules` array.

 *

 * @param array $css_rules {

 *     Required. A collection of CSS rules.

 *

 *     @type array ...$0 {

 *         @type string   $rules_group  A parent CSS selector in the case of nested CSS,

 *                                      or a CSS nested @rule, such as `@media (min-width: 80rem)` or `@layer module`.

 *         @type string   $selector     A CSS selector.

 *         @type string[] $declarations An associative array of CSS definitions,

 *                                      e.g. `array( "$property" => "$value", "$property" => "$value" )`.

 *     }

 * }

 * @param array $options {

 *     Optional. An array of options. Default empty array.

 *

 *     @type string|null $context  An identifier describing the origin of the style object,

 *                                 e.g. 'block-supports' or 'global-styles'. Default 'block-supports'.

 *                                 When set, the style engine will attempt to store the CSS rules.

 *     @type bool        $optimize Whether to optimize the CSS output, e.g. combine rules.

 *                                 Default false.

 *     @type bool        $prettify Whether to add new lines and indents to output.

 *                                 Defaults to whether the `SCRIPT_DEBUG` constant is defined.

 * }

 * @return string A string of compiled CSS declarations, or empty string.

 */

function wp_style_engine_get_stylesheet_from_css_rules( $css_rules, $options = array() ) {

	if ( empty( $css_rules ) ) {

		return '';

	}

	$options = wp_parse_args(

		$options,

		array(

			'context' => null,

		)

	);

	$css_rule_objects = array();

	foreach ( $css_rules as $css_rule ) {

		if ( empty( $css_rule['selector'] ) || empty( $css_rule['declarations'] ) || ! is_array( $css_rule['declarations'] ) ) {

			continue;

		}

		$rules_group = $css_rule['rules_group'] ?? null;

		if ( ! empty( $options['context'] ) ) {

			WP_Style_Engine::store_css_rule( $options['context'], $css_rule['selector'], $css_rule['declarations'], $rules_group );

		}

		$css_rule_objects[] = new WP_Style_Engine_CSS_Rule( $css_rule['selector'], $css_rule['declarations'], $rules_group );

	}

	if ( empty( $css_rule_objects ) ) {

		return '';

	}

	return WP_Style_Engine::compile_stylesheet_from_css_rules( $css_rule_objects, $options );

}

/**

 * Returns compiled CSS from a store, if found.

 *

 * @since 6.1.0

 *

 * @param string $context A valid context name, corresponding to an existing store key.

 * @param array  $options {

 *     Optional. An array of options. Default empty array.

 *

 *     @type bool $optimize Whether to optimize the CSS output, e.g. combine rules.

 *                          Default false.

 *     @type bool $prettify Whether to add new lines and indents to output.

 *                          Defaults to whether the `SCRIPT_DEBUG` constant is defined.

 * }

 * @return string A compiled CSS string.

 */

function wp_style_engine_get_stylesheet_from_context( $context, $options = array() ) {

	return WP_Style_Engine::compile_stylesheet_from_css_rules( WP_Style_Engine::get_store( $context )->get_all_rules(), $options );

}