<?php
/**
 * @package     FrameworkOnFramework
 * @subpackage  platform
 * @copyright   Copyright (C) 2010-2016 Nicholas K. Dionysopoulos / Akeeba Ltd. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */
// Protect from unauthorized access
defined('F0F_INCLUDED') or die;

/**
 * Part of the F0F Platform Abstraction Layer.
 *
 * This implements the platform class for Joomla! 2.5 or later
 *
 * @package  FrameworkOnFramework
 * @since    2.1
 */
class F0FIntegrationJoomlaPlatform extends F0FPlatform implements F0FPlatformInterface
{
	/**
	 * The table and table field cache object, used to speed up database access
	 *
	 * @var  JRegistry|null
	 */
	private $_cache = null;

	/**
	 * Public constructor
	 */
	public function __construct()
	{
		$this->name = 'joomla';
		$this->humanReadableName = 'Joomla!';
		$this->version = defined('JVERSION') ? JVERSION : '0.0';
	}

    /**
     * Checks if the current script is run inside a valid CMS execution
     *
     * @see F0FPlatformInterface::checkExecution()
     *
     * @return bool
     */
    public function checkExecution()
    {
        return defined('_JEXEC');
    }

    public function raiseError($code, $message)
    {
        if (version_compare($this->version, '3.0', 'ge'))
        {
            throw new Exception($message, $code);
        }
        else
        {
            return JError::raiseError($code, $message);
        }
    }

	/**
	 * Is this platform enabled?
	 *
	 * @see F0FPlatformInterface::isEnabled()
	 *
	 * @return  boolean
	 */
	public function isEnabled()
	{
		if (is_null($this->isEnabled))
		{
			$this->isEnabled = true;

			// Make sure _JEXEC is defined
			if (!defined('_JEXEC'))
			{
				$this->isEnabled = false;
			}

			// We need JVERSION to be defined
			if ($this->isEnabled)
			{
				if (!defined('JVERSION'))
				{
					$this->isEnabled = false;
				}
			}

			// Check if JFactory exists
			if ($this->isEnabled)
			{
				if (!class_exists('JFactory'))
				{
					$this->isEnabled = false;
				}
			}

			// Check if JApplication exists
			if ($this->isEnabled)
			{
				$appExists = class_exists('JApplication');
				$appExists = $appExists || class_exists('JCli');
				$appExists = $appExists || class_exists('JApplicationCli');

				if (!$appExists)
				{
					$this->isEnabled = false;
				}
			}
		}

		return $this->isEnabled;
	}

	/**
	 * Main function to detect if we're running in a CLI environment and we're admin
	 *
	 * @return  array  isCLI and isAdmin. It's not an associtive array, so we can use list.
	 */
	protected function isCliAdmin()
	{
		static $isCLI   = null;
		static $isAdmin = null;

		if (is_null($isCLI) && is_null($isAdmin))
		{
			try
			{
				if (is_null(JFactory::$application))
				{
					$isCLI = true;
				}
				else
				{
                    $app = JFactory::getApplication();
					$isCLI = $app instanceof JException || $app instanceof JApplicationCli;
				}
			}
			catch (Exception $e)
			{
				$isCLI = true;
			}

			if ($isCLI)
			{
				$isAdmin = false;
			}
			else
			{
				$isAdmin = !JFactory::$application ? false : JFactory::getApplication()->isAdmin();
			}
		}

		return array($isCLI, $isAdmin);
	}

    /**
     * Returns absolute path to directories used by the CMS.
     *
     * @see F0FPlatformInterface::getPlatformBaseDirs()
     *
     * @return  array  A hash array with keys root, public, admin, tmp and log.
     */
    public function getPlatformBaseDirs()
    {
        return array(
            'root'   => JPATH_ROOT,
            'public' => JPATH_SITE,
            'admin'  => JPATH_ADMINISTRATOR,
            'tmp'    => JFactory::getConfig()->get('tmp_dir'),
            'log'    => JFactory::getConfig()->get('log_dir')
        );
    }

	/**
	 * Returns the base (root) directories for a given component.
	 *
	 * @param   string  $component  The name of the component. For Joomla! this
	 *                              is something like "com_example"
	 *
	 * @see F0FPlatformInterface::getComponentBaseDirs()
	 *
	 * @return  array  A hash array with keys main, alt, site and admin.
	 */
	public function getComponentBaseDirs($component)
	{
		if ($this->isFrontend())
		{
			$mainPath	= JPATH_SITE . '/components/' . $component;
			$altPath	= JPATH_ADMINISTRATOR . '/components/' . $component;
		}
		else
		{
			$mainPath	= JPATH_ADMINISTRATOR . '/components/' . $component;
			$altPath	= JPATH_SITE . '/components/' . $component;
		}

		return array(
			'main'	=> $mainPath,
			'alt'	=> $altPath,
			'site'	=> JPATH_SITE . '/components/' . $component,
			'admin'	=> JPATH_ADMINISTRATOR . '/components/' . $component,
		);
	}

	/**
	 * Return a list of the view template paths for this component.
	 *
	 * @param   string   $component  The name of the component. For Joomla! this
	 *                               is something like "com_example"
	 * @param   string   $view       The name of the view you're looking a
	 *                               template for
	 * @param   string   $layout     The layout name to load, e.g. 'default'
	 * @param   string   $tpl        The sub-template name to load (null by default)
	 * @param   boolean  $strict     If true, only the specified layout will be searched for.
	 *                               Otherwise we'll fall back to the 'default' layout if the
	 *                               specified layout is not found.
	 *
	 * @see F0FPlatformInterface::getViewTemplateDirs()
	 *
	 * @return  array
	 */
	public function getViewTemplatePaths($component, $view, $layout = 'default', $tpl = null, $strict = false)
	{
		$isAdmin = $this->isBackend();

		$basePath = $isAdmin ? 'admin:' : 'site:';
		$basePath .= $component . '/';
		$altBasePath = $basePath;
		$basePath .= $view . '/';
		$altBasePath .= (F0FInflector::isSingular($view) ? F0FInflector::pluralize($view) : F0FInflector::singularize($view)) . '/';

		if ($strict)
		{
			$paths = array(
				$basePath . $layout . ($tpl ? "_$tpl" : ''),
				$altBasePath . $layout . ($tpl ? "_$tpl" : ''),
			);
		}
		else
		{
			$paths = array(
				$basePath . $layout . ($tpl ? "_$tpl" : ''),
				$basePath . $layout,
				$basePath . 'default' . ($tpl ? "_$tpl" : ''),
				$basePath . 'default',
				$altBasePath . $layout . ($tpl ? "_$tpl" : ''),
				$altBasePath . $layout,
				$altBasePath . 'default' . ($tpl ? "_$tpl" : ''),
				$altBasePath . 'default',
			);
			$paths = array_unique($paths);
		}

		return $paths;
	}

	/**
	 * Get application-specific suffixes to use with template paths. This allows
	 * you to look for view template overrides based on the application version.
	 *
	 * @return  array  A plain array of suffixes to try in template names
	 */
	public function getTemplateSuffixes()
	{
		$jversion = new JVersion;
		$versionParts = explode('.', $jversion->RELEASE);
		$majorVersion = array_shift($versionParts);
		$suffixes = array(
			'.j' . str_replace('.', '', $jversion->getHelpVersion()),
			'.j' . $majorVersion,
		);

		return $suffixes;
	}

	/**
	 * Return the absolute path to the application's template overrides
	 * directory for a specific component. We will use it to look for template
	 * files instead of the regular component directorues. If the application
	 * does not have such a thing as template overrides return an empty string.
	 *
	 * @param   string   $component  The name of the component for which to fetch the overrides
	 * @param   boolean  $absolute   Should I return an absolute or relative path?
	 *
	 * @return  string  The path to the template overrides directory
	 */
	public function getTemplateOverridePath($component, $absolute = true)
	{
		list($isCli, $isAdmin) = $this->isCliAdmin();

		if (!$isCli)
		{
			if ($absolute)
			{
				$path = JPATH_THEMES . '/';
			}
			else
			{
				$path = $isAdmin ? 'administrator/templates/' : 'templates/';
			}

			if (substr($component, 0, 7) == 'media:/')
			{
				$directory = 'media/' . substr($component, 7);
			}
			else
			{
				$directory = 'html/' . $component;
			}

			$path .= JFactory::getApplication()->getTemplate() .
				'/' . $directory;
		}
		else
		{
			$path = '';
		}

		return $path;
	}

	/**
	 * Load the translation files for a given component.
	 *
	 * @param   string  $component  The name of the component. For Joomla! this
	 *                              is something like "com_example"
	 *
	 * @see F0FPlatformInterface::loadTranslations()
	 *
	 * @return  void
	 */
	public function loadTranslations($component)
	{
		if ($this->isBackend())
		{
			$paths = array(JPATH_ROOT, JPATH_ADMINISTRATOR);
		}
		else
		{
			$paths = array(JPATH_ADMINISTRATOR, JPATH_ROOT);
		}

		$jlang = JFactory::getLanguage();
		$jlang->load($component, $paths[0], 'en-GB', true);
		$jlang->load($component, $paths[0], null, true);
		$jlang->load($component, $paths[1], 'en-GB', true);
		$jlang->load($component, $paths[1], null, true);
	}

	/**
	 * Authorise access to the component in the back-end.
	 *
	 * @param   string  $component  The name of the component.
	 *
	 * @see F0FPlatformInterface::authorizeAdmin()
	 *
	 * @return  boolean  True to allow loading the component, false to halt loading
	 */
	public function authorizeAdmin($component)
	{
		if ($this->isBackend())
		{
			// Master access check for the back-end, Joomla! 1.6 style.
			$user = JFactory::getUser();

			if (!$user->authorise('core.manage', $component)
				&& !$user->authorise('core.admin', $component))
			{
				return false;
			}
		}

		return true;
	}

	/**
	 * Return a user object.
	 *
	 * @param   integer  $id  The user ID to load. Skip or use null to retrieve
	 *                        the object for the currently logged in user.
	 *
	 * @see F0FPlatformInterface::getUser()
	 *
	 * @return  JUser  The JUser object for the specified user
	 */
	public function getUser($id = null)
	{
		return JFactory::getUser($id);
	}

	/**
	 * Returns the JDocument object which handles this component's response.
	 *
	 * @see F0FPlatformInterface::getDocument()
	 *
	 * @return  JDocument
	 */
	public function getDocument()
	{
		$document = null;

		if (!$this->isCli())
		{
			try
			{
				$document = JFactory::getDocument();
			}
			catch (Exception $exc)
			{
				$document = null;
			}
		}

		return $document;
	}

    /**
     * Returns an object to handle dates
     *
     * @param   mixed   $time       The initial time
     * @param   null    $tzOffest   The timezone offset
     * @param   bool    $locale     Should I try to load a specific class for current language?
     *
     * @return  JDate object
     */
    public function getDate($time = 'now', $tzOffest = null, $locale = true)
    {
        if($locale)
        {
            return JFactory::getDate($time, $tzOffest);
        }
        else
        {
            return new JDate($time, $tzOffest);
        }
    }

    public function getLanguage()
    {
        return JFactory::getLanguage();
    }

    public function getDbo()
    {
		return F0FDatabaseFactory::getInstance()->getDriver('joomla');
    }

	/**
	 * This method will try retrieving a variable from the request (input) data.
	 *
	 * @param   string    $key           The user state key for the variable
	 * @param   string    $request       The request variable name for the variable
	 * @param   F0FInput  $input         The F0FInput object with the request (input) data
	 * @param   mixed     $default       The default value. Default: null
	 * @param   string    $type          The filter type for the variable data. Default: none (no filtering)
	 * @param   boolean   $setUserState  Should I set the user state with the fetched value?
	 *
	 * @see F0FPlatformInterface::getUserStateFromRequest()
	 *
	 * @return  mixed  The value of the variable
	 */
	public function getUserStateFromRequest($key, $request, $input, $default = null, $type = 'none', $setUserState = true)
	{
		list($isCLI, $isAdmin) = $this->isCliAdmin();

		if ($isCLI)
		{
			return $input->get($request, $default, $type);
		}

		$app = JFactory::getApplication();

		if (method_exists($app, 'getUserState'))
		{
			$old_state = $app->getUserState($key, $default);
		}
		else
		{
			$old_state = null;
		}

		$cur_state = (!is_null($old_state)) ? $old_state : $default;
		$new_state = $input->get($request, null, $type);

		// Save the new value only if it was set in this request
		if ($setUserState)
		{
			if ($new_state !== null)
			{
				$app->setUserState($key, $new_state);
			}
			else
			{
				$new_state = $cur_state;
			}
		}
		elseif (is_null($new_state))
		{
			$new_state = $cur_state;
		}

		return $new_state;
	}

	/**
	 * Load plugins of a specific type. Obviously this seems to only be required
	 * in the Joomla! CMS.
	 *
	 * @param   string  $type  The type of the plugins to be loaded
	 *
	 * @see F0FPlatformInterface::importPlugin()
	 *
	 * @return void
	 */
	public function importPlugin($type)
	{
		if (!$this->isCli())
		{
            JLoader::import('joomla.plugin.helper');
			JPluginHelper::importPlugin($type);
		}
	}

	/**
	 * Execute plugins (system-level triggers) and fetch back an array with
	 * their return values.
	 *
	 * @param   string  $event  The event (trigger) name, e.g. onBeforeScratchMyEar
	 * @param   array   $data   A hash array of data sent to the plugins as part of the trigger
	 *
	 * @see F0FPlatformInterface::runPlugins()
	 *
	 * @return  array  A simple array containing the results of the plugins triggered
	 */
	public function runPlugins($event, $data)
	{
		if (!$this->isCli())
		{
			$app = JFactory::getApplication();

			if (method_exists($app, 'triggerEvent'))
			{
				return $app->triggerEvent($event, $data);
			}

			// IMPORTANT: DO NOT REPLACE THIS INSTANCE OF JDispatcher WITH ANYTHING ELSE. WE NEED JOOMLA!'S PLUGIN EVENT
			// DISPATCHER HERE, NOT OUR GENERIC EVENTS DISPATCHER
			if (class_exists('JEventDispatcher'))
			{
				$dispatcher = JEventDispatcher::getInstance();
			}
			else
			{
				$dispatcher = JDispatcher::getInstance();
			}

			return $dispatcher->trigger($event, $data);
		}
		else
		{
			return array();
		}
	}

	/**
	 * Perform an ACL check.
	 *
	 * @param   string  $action     The ACL privilege to check, e.g. core.edit
	 * @param   string  $assetname  The asset name to check, typically the component's name
	 *
	 * @see F0FPlatformInterface::authorise()
	 *
	 * @return  boolean  True if the user is allowed this action
	 */
	public function authorise($action, $assetname)
	{
		if ($this->isCli())
		{
			return true;
		}

		return JFactory::getUser()->authorise($action, $assetname);
	}

	/**
	 * Is this the administrative section of the component?
	 *
	 * @see F0FPlatformInterface::isBackend()
	 *
	 * @return  boolean
	 */
	public function isBackend()
	{
		list ($isCli, $isAdmin) = $this->isCliAdmin();

		return $isAdmin && !$isCli;
	}

	/**
	 * Is this the public section of the component?
	 *
	 * @see F0FPlatformInterface::isFrontend()
	 *
	 * @return  boolean
	 */
	public function isFrontend()
	{
		list ($isCli, $isAdmin) = $this->isCliAdmin();

		return !$isAdmin && !$isCli;
	}

	/**
	 * Is this a component running in a CLI application?
	 *
	 * @see F0FPlatformInterface::isCli()
	 *
	 * @return  boolean
	 */
	public function isCli()
	{
		list ($isCli, $isAdmin) = $this->isCliAdmin();

		return !$isAdmin && $isCli;
	}

	/**
	 * Is AJAX re-ordering supported? This is 100% Joomla!-CMS specific. All
	 * other platforms should return false and never ask why.
	 *
	 * @see F0FPlatformInterface::supportsAjaxOrdering()
	 *
	 * @return  boolean
	 */
	public function supportsAjaxOrdering()
	{
		return version_compare(JVERSION, '3.0', 'ge');
	}

	/**
	 * Is the global F0F cache enabled?
	 *
	 * @return  boolean
	 */
	public function isGlobalF0FCacheEnabled()
	{
		return !(defined('JDEBUG') && JDEBUG);
	}

	/**
	 * Saves something to the cache. This is supposed to be used for system-wide
	 * F0F data, not application data.
	 *
	 * @param   string  $key      The key of the data to save
	 * @param   string  $content  The actual data to save
	 *
	 * @return  boolean  True on success
	 */
	public function setCache($key, $content)
	{
		$registry = $this->getCacheObject();

		$registry->set($key, $content);

		return $this->saveCache();
	}

	/**
	 * Retrieves data from the cache. This is supposed to be used for system-side
	 * F0F data, not application data.
	 *
	 * @param   string  $key      The key of the data to retrieve
	 * @param   string  $default  The default value to return if the key is not found or the cache is not populated
	 *
	 * @return  string  The cached value
	 */
	public function getCache($key, $default = null)
	{
		$registry = $this->getCacheObject();

		return $registry->get($key, $default);
	}

	/**
	 * Gets a reference to the cache object, loading it from the disk if
	 * needed.
	 *
	 * @param   boolean  $force  Should I forcibly reload the registry?
	 *
	 * @return  JRegistry
	 */
	private function &getCacheObject($force = false)
	{
		// Check if we have to load the cache file or we are forced to do that
		if (is_null($this->_cache) || $force)
		{
			// Create a new JRegistry object
			JLoader::import('joomla.registry.registry');
			$this->_cache = new JRegistry;

			// Try to get data from Joomla!'s cache
			$cache = JFactory::getCache('fof', '');
			$data = $cache->get('cache', 'fof');

			// If data is not found, fall back to the legacy (F0F 2.1.rc3 and earlier) method
			if ($data === false)
			{
				// Find the path to the file
				$cachePath  = JPATH_CACHE . '/fof';
				$filename   = $cachePath . '/cache.php';
                $filesystem = $this->getIntegrationObject('filesystem');

				// Load the cache file if it exists. JRegistryFormatPHP fails
				// miserably, so I have to work around it.
				if ($filesystem->fileExists($filename))
				{
					@include_once $filename;

					$filesystem->fileDelete($filename);

					$className = 'F0FCacheStorage';

					if (class_exists($className))
					{
						$object = new $className;
						$this->_cache->loadObject($object);

						$options = array(
							'class' => 'F0FCacheStorage'
						);
						$cache->store($this->_cache, 'cache', 'fof');
					}
				}
			}
			else
			{
				$this->_cache = $data;
			}
		}

		return $this->_cache;
	}

	/**
	 * Save the cache object back to disk
	 *
	 * @return  boolean  True on success
	 */
	private function saveCache()
	{
		// Get the JRegistry object of our cached data
		$registry = $this->getCacheObject();

		$cache = JFactory::getCache('fof', '');
		return $cache->store($registry, 'cache', 'fof');
	}

	/**
	 * Clears the cache of system-wide F0F data. You are supposed to call this in
	 * your components' installation script post-installation and post-upgrade
	 * methods or whenever you are modifying the structure of database tables
	 * accessed by F0F. Please note that F0F's cache never expires and is not
	 * purged by Joomla!. You MUST use this method to manually purge the cache.
	 *
	 * @return  boolean  True on success
	 */
	public function clearCache()
	{
		$false = false;
		$cache = JFactory::getCache('fof', '');
		$cache->store($false, 'cache', 'fof');
	}

    public function getConfig()
    {
        return JFactory::getConfig();
    }

	/**
	 * logs in a user
	 *
	 * @param   array  $authInfo  authentification information
	 *
	 * @return  boolean  True on success
	 */
	public function loginUser($authInfo)
	{
		JLoader::import('joomla.user.authentication');
		$options = array('remember'		 => false);
		$authenticate = JAuthentication::getInstance();
		$response = $authenticate->authenticate($authInfo, $options);

        // User failed to authenticate: maybe he enabled two factor authentication?
        // Let's try again "manually", skipping the check vs two factor auth
        // Due the big mess with encryption algorithms and libraries, we are doing this extra check only
        // if we're in Joomla 2.5.18+ or 3.2.1+
        if($response->status != JAuthentication::STATUS_SUCCESS && method_exists('JUserHelper', 'verifyPassword'))
        {
            $db    = $this->getDbo();
            $query = $db->getQuery(true)
                        ->select('id, password')
                        ->from('#__users')
                        ->where('username=' . $db->quote($authInfo['username']));
            $result = $db->setQuery($query)->loadObject();

            if ($result)
            {

                $match = JUserHelper::verifyPassword($authInfo['password'], $result->password, $result->id);

                if ($match === true)
                {
                    // Bring this in line with the rest of the system
                    $user = JUser::getInstance($result->id);
                    $response->email = $user->email;
                    $response->fullname = $user->name;

                    if (JFactory::getApplication()->isAdmin())
                    {
                        $response->language = $user->getParam('admin_language');
                    }
                    else
                    {
                        $response->language = $user->getParam('language');
                    }

                    $response->status = JAuthentication::STATUS_SUCCESS;
                    $response->error_message = '';
                }
            }
        }

		if ($response->status == JAuthentication::STATUS_SUCCESS)
		{
			$this->importPlugin('user');
			$results = $this->runPlugins('onLoginUser', array((array) $response, $options));

			JLoader::import('joomla.user.helper');
			$userid = JUserHelper::getUserId($response->username);
			$user = $this->getUser($userid);

			$session = JFactory::getSession();
			$session->set('user', $user);

			return true;
		}

		return false;
	}

	/**
	 * logs out a user
	 *
	 * @return  boolean  True on success
	 */
	public function logoutUser()
	{
		JLoader::import('joomla.user.authentication');
		$app = JFactory::getApplication();
		$options = array('remember'	 => false);
		$parameters = array('username'	 => $this->getUser()->username);

		return $app->triggerEvent('onLogoutUser', array($parameters, $options));
	}

    public function logAddLogger($file)
    {
		if (!class_exists('JLog'))
		{
			return;
		}

        JLog::addLogger(array('text_file' => $file), JLog::ALL, array('fof'));
    }

	/**
	 * Logs a deprecated practice. In Joomla! this results in the $message being output in the
	 * deprecated log file, found in your site's log directory.
	 *
	 * @param   string  $message  The deprecated practice log message
	 *
	 * @return  void
	 */
	public function logDeprecated($message)
	{
		if (!class_exists('JLog'))
		{
			return;
		}

		JLog::add($message, JLog::WARNING, 'deprecated');
	}

    public function logDebug($message)
    {
		if (!class_exists('JLog'))
		{
			return;
		}

        JLog::add($message, JLog::DEBUG, 'fof');
    }

    /**
     * Returns the root URI for the request.
     *
     * @param   boolean  $pathonly  If false, prepend the scheme, host and port information. Default is false.
     * @param   string   $path      The path
     *
     * @return  string  The root URI string.
     */
    public function URIroot($pathonly = false, $path = null)
    {
        JLoader::import('joomla.environment.uri');

        return JUri::root($pathonly, $path);
    }

    /**
     * Returns the base URI for the request.
     *
     * @param   boolean  $pathonly  If false, prepend the scheme, host and port information. Default is false.
     * |
     * @return  string  The base URI string
     */
    public function URIbase($pathonly = false)
    {
        JLoader::import('joomla.environment.uri');

        return JUri::base($pathonly);
    }

    /**
     * Method to set a response header.  If the replace flag is set then all headers
     * with the given name will be replaced by the new one (only if the current platform supports header caching)
     *
     * @param   string   $name     The name of the header to set.
     * @param   string   $value    The value of the header to set.
     * @param   boolean  $replace  True to replace any headers with the same name.
     *
     * @return  void
     */
    public function setHeader($name, $value, $replace = false)
    {
		if (version_compare($this->version, '3.2', 'ge'))
		{
			JFactory::getApplication()->setHeader($name, $value, $replace);
		}
		else
		{
			JResponse::setHeader($name, $value, $replace);
		}
    }

    public function sendHeaders()
    {
    	if (version_compare($this->version, '3.2', 'ge'))
		{
			JFactory::getApplication()->sendHeaders();
		}
		else
		{
			JResponse::sendHeaders();
		}
    }
}
