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<?php
/**
 * Part of the Joomla Framework Application Package
 *
 * @copyright  Copyright (C) 2005 - 2021 Open Source Matters, Inc. All rights reserved.
 * @license    GNU General Public License version 2 or later; see LICENSE
 */

namespace Joomla\Application;

use Joomla\Event\DispatcherAwareInterface;
use Joomla\Event\DispatcherAwareTrait;
use Joomla\Event\EventInterface;
use Joomla\Registry\Registry;
use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerAwareTrait;
use Psr\Log\LoggerInterface;
use Psr\Log\NullLogger;

/**
 * Joomla Framework Base Application Class
 *
 * @since  1.0
 */
abstract class AbstractApplication implements ConfigurationAwareApplicationInterface, LoggerAwareInterface, DispatcherAwareInterface
{
	use LoggerAwareTrait, DispatcherAwareTrait;

/**
	 * The application configuration object.
	 *
	 * @var    Registry
	 * @since  1.0
	 */
	protected $config;

/**
	 * Class constructor.
	 *
	 * @param   Registry  $config  An optional argument to provide dependency injection for the application's config object.  If the argument
	 *                             is a Registry object that object will become the application's config object, otherwise a default config
	 *                             object is created.
	 *
	 * @since   1.0
	 */
	public function __construct(Registry $config = null)
	{
		$this->config = $config ?: new Registry;

// Set the execution datetime and timestamp;
		$this->set('execution.datetime', gmdate('Y-m-d H:i:s'));
		$this->set('execution.timestamp', time());
		$this->set('execution.microtimestamp', microtime(true));

$this->initialise();
	}

/**
	 * Method to close the application.
	 *
	 * @param   integer  $code  The exit code (optional; default is 0).
	 *
	 * @return  void
	 *
	 * @codeCoverageIgnore
	 * @since   1.0
	 */
	public function close($code = 0)
	{
		exit($code);
	}

/**
	 * Dispatches an application event if the dispatcher has been set.
	 *
	 * @param   string               $eventName  The event to dispatch.
	 * @param   EventInterface|null  $event      The event object.
	 *
	 * @return  EventInterface|null  The dispatched event or null if no dispatcher is set
	 *
	 * @since   2.0.0
	 */
	protected function dispatchEvent(string $eventName, ?EventInterface $event = null): ?EventInterface
	{
		try
		{
			$dispatcher = $this->getDispatcher();
		}
		catch (\UnexpectedValueException $exception)
		{
			return null;
		}

return $dispatcher->dispatch($eventName, $event ?: new Event\ApplicationEvent($eventName, $this));
	}

/**
	 * Method to run the application routines.
	 *
	 * Most likely you will want to instantiate a controller and execute it, or perform some sort of task directly.
	 *
	 * @return  mixed
	 *
	 * @since   1.0
	 */
	abstract protected function doExecute();

/**
	 * Execute the application.
	 *
	 * @return  void
	 *
	 * @since   1.0
	 */
	public function execute()
	{
		try
		{
			$this->dispatchEvent(ApplicationEvents::BEFORE_EXECUTE);

// Perform application routines.
			$this->doExecute();

$this->dispatchEvent(ApplicationEvents::AFTER_EXECUTE);
		}
		catch (\Throwable $throwable)
		{
			$this->dispatchEvent(ApplicationEvents::ERROR, new Event\ApplicationErrorEvent($throwable, $this));
		}
	}

/**
	 * Returns a property of the object or the default value if the property is not set.
	 *
	 * @param   string  $key      The name of the property.
	 * @param   mixed   $default  The default value (optional) if none is set.
	 *
	 * @return  mixed   The value of the configuration.
	 *
	 * @since   1.0
	 */
	public function get($key, $default = null)
	{
		return $this->config->get($key, $default);
	}

/**
	 * Get the logger.
	 *
	 * @return  LoggerInterface
	 *
	 * @since   1.0
	 */
	public function getLogger()
	{
		// If a logger hasn't been set, use NullLogger
		if (!($this->logger instanceof LoggerInterface))
		{
			$this->setLogger(new NullLogger);
		}

return $this->logger;
	}

/**
	 * Custom initialisation method.
	 *
	 * Called at the end of the AbstractApplication::__construct method.
	 * This is for developers to inject initialisation code for their application classes.
	 *
	 * @return  void
	 *
	 * @codeCoverageIgnore
	 * @since   1.0
	 */
	protected function initialise()
	{
	}

/**
	 * Modifies a property of the object, creating it if it does not already exist.
	 *
	 * @param   string  $key    The name of the property.
	 * @param   mixed   $value  The value of the property to set (optional).
	 *
	 * @return  mixed   Previous value of the property
	 *
	 * @since   1.0
	 */
	public function set($key, $value = null)
	{
		$previous = $this->config->get($key);
		$this->config->set($key, $value);

return $previous;
	}

/**
	 * Sets the configuration for the application.
	 *
	 * @param   Registry  $config  A registry object holding the configuration.
	 *
	 * @return  $this
	 *
	 * @since   1.0
	 */
	public function setConfiguration(Registry $config)
	{
		$this->config = $config;

return $this;
	}
}