<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2005 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE
 */

namespace Joomla\CMS\Dispatcher;

use Joomla\CMS\Access\Exception\NotAllowed;
use Joomla\CMS\Application\CMSApplicationInterface;
use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Language\Text;
use Joomla\CMS\MVC\Controller\BaseController;
use Joomla\CMS\MVC\Factory\MVCFactoryInterface;
use Joomla\Input\Input;

// phpcs:disable PSR1.Files.SideEffects
\defined('_JEXEC') or die;
// phpcs:enable PSR1.Files.SideEffects

/**
 * Base class for a Joomla Component Dispatcher
 *
 * Dispatchers are responsible for checking ACL of a component if appropriate and
 * choosing an appropriate controller (and if necessary, a task) and executing it.
 *
 * @since  4.0.0
 */
class ComponentDispatcher extends Dispatcher
{
    /**
     * The URL option for the component.
     *
     * @var    string
     * @since  4.0.0
     */
    protected $option;

    /**
     * The MVC factory
     *
     * @var  MVCFactoryInterface
     *
     * @since   4.0.0
     */
    protected $mvcFactory;

    /**
     * Constructor for ComponentDispatcher
     *
     * @param   CMSApplicationInterface  $app         The application instance
     * @param   Input                    $input       The input instance
     * @param   MVCFactoryInterface      $mvcFactory  The MVC factory instance
     *
     * @since   4.0.0
     */
    public function __construct(CMSApplicationInterface $app, Input $input, MVCFactoryInterface $mvcFactory)
    {
        parent::__construct($app, $input);

        $this->mvcFactory = $mvcFactory;

        // If option is not provided, detect it from dispatcher class name, ie ContentDispatcher
        if (empty($this->option)) {
            $this->option = ComponentHelper::getComponentName(
                $this,
                str_replace('com_', '', $input->get('option'))
            );
        }

        $this->loadLanguage();
    }

    /**
     * Load the language
     *
     * @return  void
     *
     * @since   4.0.0
     */
    protected function loadLanguage()
    {
        // Load common and local language files.
        $this->app->getLanguage()->load($this->option, JPATH_BASE) ||
        $this->app->getLanguage()->load($this->option, JPATH_COMPONENT);
    }

    /**
     * Method to check component access permission
     *
     * @return  void
     *
     * @since   4.0.0
     */
    protected function checkAccess()
    {
        // Check the user has permission to access this component if in the backend
        if ($this->app->isClient('administrator') && !$this->app->getIdentity()->authorise('core.manage', $this->option)) {
            throw new NotAllowed($this->app->getLanguage()->_('JERROR_ALERTNOAUTHOR'), 403);
        }
    }

    /**
     * Dispatch a controller task. Redirecting the user if appropriate.
     *
     * @return  void
     *
     * @since   4.0.0
     */
    public function dispatch()
    {
        // Check component access permission
        $this->checkAccess();

        $command = $this->input->getCmd('task', 'display');

        // Check for a controller.task command.
        if (strpos($command, '.') !== false) {
            // Explode the controller.task command.
            list ($controller, $task) = explode('.', $command);

            $this->input->set('controller', $controller);
            $this->input->set('task', $task);
        } else {
            // Do we have a controller?
            $controller = $this->input->get('controller', 'display');
            $task       = $command;
        }

        // Build controller config data
        $config['option'] = $this->option;

        // Set name of controller if it is passed in the request
        if ($this->input->exists('controller')) {
            $config['name'] = strtolower($this->input->get('controller'));
        }

        // Execute the task for this component
        $controller = $this->getController($controller, ucfirst($this->app->getName()), $config);
        $controller->execute($task);
        $controller->redirect();
    }

    /**
     * Get a controller from the component
     *
     * @param   string  $name    Controller name
     * @param   string  $client  Optional client (like Administrator, Site etc.)
     * @param   array   $config  Optional controller config
     *
     * @return  BaseController
     *
     * @since   4.0.0
     */
    public function getController(string $name, string $client = '', array $config = array()): BaseController
    {
        // Set up the client
        $client = $client ?: ucfirst($this->app->getName());

        // Get the controller instance
        $controller = $this->mvcFactory->createController(
            $name,
            $client,
            $config,
            $this->app,
            $this->input
        );

        // Check if the controller could be created
        if (!$controller) {
            throw new \InvalidArgumentException(Text::sprintf('JLIB_APPLICATION_ERROR_INVALID_CONTROLLER_CLASS', $name));
        }

        return $controller;
    }
}