<?php

/*
 * Textpattern Content Management System
 * https://textpattern.com/
 *
 * Copyright (C) 2026 The Textpattern Development Team
 *
 * This file is part of Textpattern.
 *
 * Textpattern is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation, version 2.
 *
 * Textpattern is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Textpattern. If not, see <https://www.gnu.org/licenses/>.
 */

/**
 * Container.
 *
 * Base container implementation for resolving and initialising classes.
 * Basic usage would happen with the getInstance() method:
 *
 * <code>
 * $container = new \Textpattern\Container\Container();
 * $container->getInstance('Abc_class', 'argument1', 'argument2');
 * </code>
 *
 * Normally you would write a static wrapper class for the container to keep the
 * instances and configuration between calls. See the 'Txp' class for
 * Textpattern's own implementation.
 *
 * @since   4.6.0
 * @package Container
 * @see     Txp
 */
namespace Textpattern\Container;

class Container implements \Textpattern\Container\ContainerInterface
{
    /**
     * Stores registered classes.
     *
     * @var array
     */

    protected $registered = array();

    /**
     * Stores shared instances.
     *
     * @var array
     */

    protected $instances = array();

    /**
     * {@inheritdoc}
     */

    public function register($alias, $class)
    {
        if (isset($this->registered[$alias])) {
            throw new InvalidArgumentException(gTxt('alias_is_taken'));
        }

        $this->registered[$alias] = $class;

        return $this;
    }

    /**
     * {@inheritdoc}
     */

    public function remove($alias)
    {
        unset($this->registered[$alias], $this->instances[$alias]);

        return $this;
    }

    /**
     * Resolves an alias to the actual classname.
     *
     * @param  string $alias The alias
     * @return string The classname
     */

    protected function resolveAlias($alias)
    {
        if (isset($this->registered[$alias])) {
            return $this->registered[$alias];
        }

        return $alias;
    }

    /**
     * {@inheritdoc}
     */

    public function getInstance($alias, array $options)
    {
        if (isset($this->instances[$alias])) {
            $instance = $this->instances[$alias];
        } else {
            $class = $this->resolveAlias($alias);

            if ($options && method_exists($class, '__construct')) {
                $reflection = new \ReflectionClass($class);
                $instance = $reflection->newInstanceArgs($options);
            } else {
                $instance = new $class;
            }

            if ($instance instanceof \Textpattern\Container\ReusableInterface) {
                $this->instances[$alias] = $instance;
            }
        }

        if ($instance instanceof \Textpattern\Container\FactorableInterface) {
            $instance = call_user_func_array(array($instance, 'getInstance'), $options);
        }

        return $instance;
    }
}
