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<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Workflow;

use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Event\AbstractEvent;
use Joomla\CMS\Factory;
use Joomla\CMS\MVC\Factory\MVCFactoryInterface;
use Joomla\CMS\MVC\Model\WorkflowModelInterface;
use Joomla\Event\DispatcherAwareInterface;

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

/**
 * Trait for component workflow service.
 *
 * @since  4.0.0
 */
trait WorkflowServiceTrait
{
    /**
     * Get a MVC factory
     *
     * @return  MVCFactoryInterface
     *
     * @since   4.0.0
     */
    abstract public function getMVCFactory(): MVCFactoryInterface;

    /**
     * Check if the functionality is supported by the component
     * The variable $supportFunctionality has the following structure
     * [
     *   'core.featured' => [
     *     'com_content.article',
     *   ],
     *   'core.state' => [
     *     'com_content.article',
     *   ],
     * ]
     *
     * @param   string  $functionality  The functionality
     * @param   string  $context        The context of the functionality
     *
     * @return boolean
     */
    public function supportFunctionality($functionality, $context): bool
    {
        if (empty($this->supportedFunctionality[$functionality])) {
            return false;
        }

        if (!is_array($this->supportedFunctionality[$functionality])) {
            return true;
        }

        return in_array($context, $this->supportedFunctionality[$functionality], true);
    }

    /**
     * Check if the functionality is used by a plugin
     *
     * @param   string  $functionality  The functionality
     * @param   string  $extension      The extension
     *
     * @return boolean
     * @throws \Exception
     *
     * @since   4.0.0
     */
    public function isFunctionalityUsed($functionality, $extension): bool
    {
        static $used = [];

        $cacheKey = $extension . '.' . $functionality;

        if (isset($used[$cacheKey])) {
            return $used[$cacheKey];
        }

        // The container to get the services from
        $app = Factory::getApplication();

        if (!($app instanceof DispatcherAwareInterface)) {
            return false;
        }

        $eventResult = $app->getDispatcher()->dispatch(
            'onWorkflowFunctionalityUsed',
            AbstractEvent::create(
                'onWorkflowFunctionalityUsed',
                [
                    'eventClass'    => 'Joomla\CMS\Event\Workflow\WorkflowFunctionalityUsedEvent',
                    'subject'       => $this,
                    'extension'     => $extension,
                    'functionality' => $functionality,
                ]
            )
        );

        $used[$cacheKey] = $eventResult->getArgument('used', false);

        return $used[$cacheKey];
    }

    /**
     * Returns the model name, based on the context
     *
     * @param   string  $context  The context of the workflow
     *
     * @return boolean
     *
     * @since   4.0.0
     */
    public function getModelName($context): string
    {
        $parts = explode('.', $context);

        if (count($parts) < 2) {
            return '';
        }

        array_shift($parts);

        return ucfirst(array_shift($parts));
    }

    /**
     * Returns an array of possible conditions for the component.
     *
     * @param   string  $extension  The component and section separated by ".".
     *
     * @return  array
     *
     * @since   4.0.0
     */
    public static function getConditions(string $extension): array
    {
        return \defined('self::CONDITION_NAMES') ? self::CONDITION_NAMES : Workflow::CONDITION_NAMES;
    }

    /**
     * Check if the workflow is active
     *
     * @param   string  $context  The context of the workflow
     *
     * @return boolean
     */
    public function isWorkflowActive($context): bool
    {
        $parts  = explode('.', $context);
        $config = ComponentHelper::getParams($parts[0]);

        if (!$config->get('workflow_enabled')) {
            return false;
        }

        $modelName = $this->getModelName($context);

        if (empty($modelName)) {
            return false;
        }

        $component = $this->getMVCFactory();
        $appName   = Factory::getApplication()->getName();
        $model     = $component->createModel($modelName, $appName, ['ignore_request' => true]);

        return $model instanceof WorkflowModelInterface;
    }
}