<?php

namespace Kirby\Cms;

use Kirby\Exception\BadMethodCallException;

/**
 * HasMethods
 *
 * @package   Kirby Cms
 * @author    Bastian Allgeier <bastian@getkirby.com>
 * @link      https://getkirby.com
 * @copyright Bastian Allgeier GmbH
 * @license   https://getkirby.com/license
 */
trait HasMethods
{
    /**
     * All registered methods
     *
     * @var array
     */
    public static $methods = [];

    /**
     * Calls a registered method class with the
     * passed arguments
     *
     * @internal
     * @param string $method
     * @param array $args
     * @return mixed
     * @throws \Kirby\Exception\BadMethodCallException
     */
    public function callMethod(string $method, array $args = [])
    {
        $closure = $this->getMethod($method);

        if ($closure === null) {
            throw new BadMethodCallException('The method ' . $method . ' does not exist');
        }

        return $closure->call($this, ...$args);
    }

    /**
     * Checks if the object has a registered method
     *
     * @internal
     * @param string $method
     * @return bool
     */
    public function hasMethod(string $method): bool
    {
        return $this->getMethod($method) !== null;
    }

    /**
     * Returns a registered method by name, either from
     * the current class or from a parent class ordered by
     * inheritance order (top to bottom)
     *
     * @param string $method
     * @return \Closure|null
     */
    protected function getMethod(string $method)
    {
        if (isset(static::$methods[$method]) === true) {
            return static::$methods[$method];
        }

        foreach (class_parents($this) as $parent) {
            if (isset($parent::$methods[$method]) === true) {
                return $parent::$methods[$method];
            }
        }

        return null;
    }
}