<?php
/**
 * Style Engine: WP_Style_Engine_CSS_Rule class
 *
 * @package WordPress
 * @subpackage StyleEngine
 * @since 6.1.0
 */

/**
 * Core class used for style engine CSS rules.
 *
 * Holds, sanitizes, processes, and prints CSS declarations for the style engine.
 *
 * @since 6.1.0
 */
#[AllowDynamicProperties]
class WP_Style_Engine_CSS_Rule {

    /**
     * The selector.
     *
     * @since 6.1.0
     * @var string
     */
    protected $selector;

    /**
     * The selector declarations.
     *
     * Contains a WP_Style_Engine_CSS_Declarations object.
     *
     * @since 6.1.0
     * @var WP_Style_Engine_CSS_Declarations
     */
    protected $declarations;

    /**
     * A parent CSS selector in the case of nested CSS, or a CSS nested @rule,
     * such as `@media (min-width: 80rem)` or `@layer module`.
     *
     * @since 6.6.0
     * @var string
     */
    protected $rules_group;

    /**
     * Constructor.
     *
     * @since 6.1.0
     * @since 6.6.0 Added the `$rules_group` parameter.
     *
     * @param string                                    $selector     Optional. The CSS selector. Default empty string.
     * @param string[]|WP_Style_Engine_CSS_Declarations $declarations Optional. An associative array of CSS definitions,
     *                                                                e.g. `array( "$property" => "$value", "$property" => "$value" )`,
     *                                                                or a WP_Style_Engine_CSS_Declarations object.
     *                                                                Default empty array.
     * @param 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`.
     */
    public function __construct( $selector = '', $declarations = array(), $rules_group = '' ) {
        $this->set_selector( $selector );
        $this->add_declarations( $declarations );
        $this->set_rules_group( $rules_group );
    }

    /**
     * Sets the selector.
     *
     * @since 6.1.0
     *
     * @param string $selector The CSS selector.
     * @return WP_Style_Engine_CSS_Rule Returns the object to allow chaining of methods.
     */
    public function set_selector( $selector ) {
        $this->selector = $selector;
        return $this;
    }

    /**
     * Sets the declarations.
     *
     * @since 6.1.0
     *
     * @param string[]|WP_Style_Engine_CSS_Declarations $declarations An array of declarations (property => value pairs),
     *                                                                or a WP_Style_Engine_CSS_Declarations object.
     * @return WP_Style_Engine_CSS_Rule Returns the object to allow chaining of methods.
     */
    public function add_declarations( $declarations ) {
        $is_declarations_object = ! is_array( $declarations );
        $declarations_array     = $is_declarations_object ? $declarations->get_declarations() : $declarations;

        if ( null === $this->declarations ) {
            if ( $is_declarations_object ) {
                $this->declarations = $declarations;
                return $this;
            }
            $this->declarations = new WP_Style_Engine_CSS_Declarations( $declarations_array );
        }
        $this->declarations->add_declarations( $declarations_array );

        return $this;
    }

    /**
     * Sets the rules group.
     *
     * @since 6.6.0
     *
     * @param 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`.
     * @return WP_Style_Engine_CSS_Rule Returns the object to allow chaining of methods.
     */
    public function set_rules_group( $rules_group ) {
        $this->rules_group = $rules_group;
        return $this;
    }

    /**
     * Gets the rules group.
     *
     * @since 6.6.0
     *
     * @return string
     */
    public function get_rules_group() {
        return $this->rules_group;
    }

    /**
     * Gets the declarations object.
     *
     * @since 6.1.0
     *
     * @return WP_Style_Engine_CSS_Declarations The declarations object.
     */
    public function get_declarations() {
        return $this->declarations;
    }

    /**
     * Gets the full selector.
     *
     * @since 6.1.0
     *
     * @return string
     */
    public function get_selector() {
        return $this->selector;
    }

    /**
     * Gets the CSS.
     *
     * @since 6.1.0
     * @since 6.6.0 Added support for nested CSS with rules groups.
     *
     * @param bool $should_prettify Optional. Whether to add spacing, new lines and indents.
     *                              Default false.
     * @param int  $indent_count    Optional. The number of tab indents to apply to the rule.
     *                              Applies if `prettify` is `true`. Default 0.
     * @return string
     */
    public function get_css( $should_prettify = false, $indent_count = 0 ) {
        $rule_indent                = $should_prettify ? str_repeat( "\t", $indent_count ) : '';
        $nested_rule_indent         = $should_prettify ? str_repeat( "\t", $indent_count + 1 ) : '';
        $declarations_indent        = $should_prettify ? $indent_count + 1 : 0;
        $nested_declarations_indent = $should_prettify ? $indent_count + 2 : 0;
        $suffix                     = $should_prettify ? "\n" : '';
        $spacer                     = $should_prettify ? ' ' : '';
        // Trims any multiple selectors strings.
        $selector         = $should_prettify ? implode( ',', array_map( 'trim', explode( ',', $this->get_selector() ) ) ) : $this->get_selector();
        $selector         = $should_prettify ? str_replace( array( ',' ), ",\n", $selector ) : $selector;
        $rules_group      = $this->get_rules_group();
        $has_rules_group  = ! empty( $rules_group );
        $css_declarations = $this->declarations->get_declarations_string( $should_prettify, $has_rules_group ? $nested_declarations_indent : $declarations_indent );

        if ( empty( $css_declarations ) ) {
            return '';
        }

        if ( $has_rules_group ) {
            $selector = "{$rule_indent}{$rules_group}{$spacer}{{$suffix}{$nested_rule_indent}{$selector}{$spacer}{{$suffix}{$css_declarations}{$suffix}{$nested_rule_indent}}{$suffix}{$rule_indent}}";
            return $selector;
        }

        return "{$rule_indent}{$selector}{$spacer}{{$suffix}{$css_declarations}{$suffix}{$rule_indent}}";
    }
}