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

/**
 * Core class used as a store for WP_Style_Engine_CSS_Rule objects.
 *
 * Holds, sanitizes, processes, and prints CSS declarations for the style engine.
 *
 * @since 6.1.0
 *
 * @phpstan-consistent-constructor
 */
#[AllowDynamicProperties]
class WP_Style_Engine_CSS_Rules_Store {

    /**
     * An array of named WP_Style_Engine_CSS_Rules_Store objects.
     *
     * @static
     *
     * @since 6.1.0
     * @var WP_Style_Engine_CSS_Rules_Store[]
     */
    protected static $stores = array();

    /**
     * The store name.
     *
     * @since 6.1.0
     * @var string
     */
    protected $name = '';

    /**
     * An array of CSS Rules objects assigned to the store.
     *
     * @since 6.1.0
     * @var WP_Style_Engine_CSS_Rule[]
     */
    protected $rules = array();

    /**
     * Gets an instance of the store.
     *
     * @since 6.1.0
     *
     * @param string $store_name The name of the store.
     * @return WP_Style_Engine_CSS_Rules_Store|void
     */
    public static function get_store( $store_name = 'default' ) {
        if ( ! is_string( $store_name ) || empty( $store_name ) ) {
            return;
        }
        if ( ! isset( static::$stores[ $store_name ] ) ) {
            static::$stores[ $store_name ] = new static();
            // Set the store name.
            static::$stores[ $store_name ]->set_name( $store_name );
        }
        return static::$stores[ $store_name ];
    }

    /**
     * Gets an array of all available stores.
     *
     * @since 6.1.0
     *
     * @return WP_Style_Engine_CSS_Rules_Store[]
     */
    public static function get_stores() {
        return static::$stores;
    }

    /**
     * Clears all stores from static::$stores.
     *
     * @since 6.1.0
     */
    public static function remove_all_stores() {
        static::$stores = array();
    }

    /**
     * Sets the store name.
     *
     * @since 6.1.0
     *
     * @param string $name The store name.
     */
    public function set_name( $name ) {
        $this->name = $name;
    }

    /**
     * Gets the store name.
     *
     * @since 6.1.0
     *
     * @return string
     */
    public function get_name() {
        return $this->name;
    }

    /**
     * Gets an array of all rules.
     *
     * @since 6.1.0
     *
     * @return WP_Style_Engine_CSS_Rule[]
     */
    public function get_all_rules() {
        return $this->rules;
    }

    /**
     * Gets a WP_Style_Engine_CSS_Rule object by its selector.
     * If the rule does not exist, it will be created.
     *
     * @since 6.1.0
     * @since 6.6.0 Added the $rules_group parameter.
     *
     * @param string $selector The CSS selector.
     * @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|void Returns a WP_Style_Engine_CSS_Rule object,
     *                                       or void if the selector is empty.
     */
    public function add_rule( $selector, $rules_group = '' ) {
        $selector    = $selector ? trim( $selector ) : '';
        $rules_group = $rules_group ? trim( $rules_group ) : '';

        // Bail early if there is no selector.
        if ( empty( $selector ) ) {
            return;
        }

        if ( ! empty( $rules_group ) ) {
            if ( empty( $this->rules[ "$rules_group $selector" ] ) ) {
                $this->rules[ "$rules_group $selector" ] = new WP_Style_Engine_CSS_Rule( $selector, array(), $rules_group );
            }
            return $this->rules[ "$rules_group $selector" ];
        }

        // Create the rule if it doesn't exist.
        if ( empty( $this->rules[ $selector ] ) ) {
            $this->rules[ $selector ] = new WP_Style_Engine_CSS_Rule( $selector );
        }

        return $this->rules[ $selector ];
    }

    /**
     * Removes a selector from the store.
     *
     * @since 6.1.0
     *
     * @param string $selector The CSS selector.
     */
    public function remove_rule( $selector ) {
        unset( $this->rules[ $selector ] );
    }
}