<?php

/**
 * Ability for discovering available WordPress abilities.
 *
 * @package McpAdapter
 */
declare (strict_types=1);
namespace Bluehost\Plugin\WP\MCP\Abilities;

use WP_Error;
/**
 * Discover Abilities - Lists all available WordPress abilities in the system.
 *
 * This ability provides discovery functionality for the MCP protocol.
 * It discovers all registered WordPress abilities in the system.
 *
 * SECURITY CONSIDERATIONS:
 * - This ability exposes information about all registered abilities in the system
 * - Only abilities with mcp.public=true metadata will be returned
 * - Requires proper WordPress capability checks for secure operation
 *
 * @see https://developer.wordpress.org/apis/security/ for detailed security guidance
 */
final class DiscoverAbilitiesAbility
{
    use McpAbilityHelperTrait;
    /**
     * Register the ability.
     */
    public static function register(): void
    {
        wp_register_ability('mcp-adapter/discover-abilities', array('label' => 'Discover Abilities', 'description' => 'Discover all available WordPress abilities in the system. Returns a list of all registered abilities with their basic information.', 'category' => 'mcp-adapter', 'output_schema' => array('type' => 'object', 'properties' => array('abilities' => array('type' => 'array', 'items' => array('type' => 'object', 'properties' => array('name' => array('type' => 'string'), 'label' => array('type' => 'string'), 'description' => array('type' => 'string')), 'required' => array('name', 'label', 'description')))), 'required' => array('abilities')), 'permission_callback' => array(self::class, 'check_permission'), 'execute_callback' => array(self::class, 'execute'), 'meta' => array('annotations' => array('readonly' => \true, 'destructive' => \false, 'idempotent' => \true))));
    }
    /**
     * Execute the discover abilities functionality.
     *
     * Note: Permission checks are handled by the WP_Ability::execute() framework method
     * before this callback is invoked.
     *
     * @see \WP_Ability::execute()
     *
     * @param array $input Input parameters (unused for this ability).
     *
     * @return array Array containing public MCP abilities.
     */
    public static function execute($input = array()): array
    {
        // Get all abilities and filter for publicly exposed ones
        $abilities = wp_get_abilities();
        $ability_list = array();
        foreach ($abilities as $ability) {
            $ability_name = $ability->get_name();
            // Check if ability is publicly exposed via MCP
            if (!self::is_ability_mcp_public($ability)) {
                continue;
            }
            // Only discover abilities with type='tool' (default type)
            if (self::get_ability_mcp_type($ability) !== 'tool') {
                continue;
            }
            $ability_list[] = array('name' => $ability_name, 'label' => $ability->get_label(), 'description' => $ability->get_description());
        }
        return array('abilities' => $ability_list);
    }
    /**
     * Check permissions for discovering abilities.
     *
     * Validates user capabilities and caller identity.
     *
     * @param array $input Input parameters (unused for this ability).
     *
     * @return bool|\WP_Error True if the user has permission to discover abilities.
     */
    public static function check_permission($input = array())
    {
        // Verify caller identity - ensure user is authenticated
        if (!is_user_logged_in()) {
            return new WP_Error('authentication_required', 'User must be authenticated to access this ability');
        }
        /**
         * Filters the capability required to discover available abilities.
         *
         * This capability is checked before listing all registered WordPress abilities
         * through the mcp-adapter-discover-abilities tool.
         *
         * @since 0.3.0
         *
         * @param string $capability The required capability. Default 'read'.
         */
        $required_capability = apply_filters('mcp_adapter_discover_abilities_capability', 'read');
        // phpcs:ignore WordPress.WP.Capabilities.Undetermined -- Capability is determined dynamically via filter
        if (!current_user_can($required_capability)) {
            return new WP_Error('insufficient_capability', sprintf('User lacks required capability: %s', $required_capability));
        }
        return \true;
    }
}
