<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_plugins
 *
 * @copyright   Copyright (C) 2005 - 2016 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

use Joomla\Registry\Registry;

/**
 * Plugin model.
 *
 * @since  1.6
 */
class PluginsModelPlugin extends JModelAdmin
{
	/**
	 * @var     string  The help screen key for the module.
	 * @since   1.6
	 */
	protected $helpKey = 'JHELP_EXTENSIONS_PLUGIN_MANAGER_EDIT';

	/**
	 * @var     string  The help screen base URL for the module.
	 * @since   1.6
	 */
	protected $helpURL;

	/**
	 * @var     array  An array of cached plugin items.
	 * @since   1.6
	 */
	protected $_cache;

	/**
	 * Constructor.
	 *
	 * @param   array  $config  An optional associative array of configuration settings.
	 */
	public function __construct($config = array())
	{
		$config = array_merge(
			array(
				'event_after_save'  => 'onExtensionAfterSave',
				'event_before_save' => 'onExtensionBeforeSave',
				'events_map'        => array(
					'save' => 'extension'
				)
			), $config
		);

		parent::__construct($config);
	}

	/**
	 * Method to get the record form.
	 *
	 * @param   array    $data      Data for the form.
	 * @param   boolean  $loadData  True if the form is to load its own data (default case), false if not.
	 *
	 * @return  JForm	A JForm object on success, false on failure.
	 *
	 * @since   1.6
	 */
	public function getForm($data = array(), $loadData = true)
	{
		// The folder and element vars are passed when saving the form.
		if (empty($data))
		{
			$item    = $this->getItem();
			$folder  = $item->folder;
			$element = $item->element;
		}
		else
		{
			$folder  = JArrayHelper::getValue($data, 'folder', '', 'cmd');
			$element = JArrayHelper::getValue($data, 'element', '', 'cmd');
		}

		// Add the default fields directory
		JForm::addFieldPath(JPATH_PLUGINS . '/' . $folder . '/' . $element . '/field');

		// These variables are used to add data from the plugin XML files.
		$this->setState('item.folder', $folder);
		$this->setState('item.element', $element);

		// Get the form.
		$form = $this->loadForm('com_plugins.plugin', 'plugin', array('control' => 'jform', 'load_data' => $loadData));

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

		// Modify the form based on access controls.
		if (!$this->canEditState((object) $data))
		{
			// Disable fields for display.
			$form->setFieldAttribute('ordering', 'disabled', 'true');
			$form->setFieldAttribute('enabled', 'disabled', 'true');

			// Disable fields while saving.
			// The controller has already verified this is a record you can edit.
			$form->setFieldAttribute('ordering', 'filter', 'unset');
			$form->setFieldAttribute('enabled', 'filter', 'unset');
		}

		return $form;
	}

	/**
	 * Method to get the data that should be injected in the form.
	 *
	 * @return  mixed  The data for the form.
	 *
	 * @since   1.6
	 */
	protected function loadFormData()
	{
		// Check the session for previously entered form data.
		$data = JFactory::getApplication()->getUserState('com_plugins.edit.plugin.data', array());

		if (empty($data))
		{
			$data = $this->getItem();
		}

		$this->preprocessData('com_plugins.plugin', $data);

		return $data;
	}

	/**
	 * Method to get a single record.
	 *
	 * @param   integer  $pk  The id of the primary key.
	 *
	 * @return  mixed  Object on success, false on failure.
	 */
	public function getItem($pk = null)
	{
		$pk = (!empty($pk)) ? $pk : (int) $this->getState('plugin.id');

		if (!isset($this->_cache[$pk]))
		{
			// Get a row instance.
			$table = $this->getTable();

			// Attempt to load the row.
			$return = $table->load($pk);

			// Check for a table object error.
			if ($return === false && $table->getError())
			{
				$this->setError($table->getError());

				return false;
			}

			// Convert to the JObject before adding other data.
			$properties = $table->getProperties(1);
			$this->_cache[$pk] = JArrayHelper::toObject($properties, 'JObject');

			// Convert the params field to an array.
			$registry = new Registry;
			$registry->loadString($table->params);
			$this->_cache[$pk]->params = $registry->toArray();

			// Get the plugin XML.
			$path = JPath::clean(JPATH_PLUGINS . '/' . $table->folder . '/' . $table->element . '/' . $table->element . '.xml');

			if (file_exists($path))
			{
				$this->_cache[$pk]->xml = simplexml_load_file($path);
			}
			else
			{
				$this->_cache[$pk]->xml = null;
			}
		}

		return $this->_cache[$pk];
	}

	/**
	 * Returns a reference to the Table object, always creating it.
	 *
	 * @param   string  $type    The table type to instantiate.
	 * @param   string  $prefix  A prefix for the table class name. Optional.
	 * @param   array   $config  Configuration array for model. Optional.
	 *
	 * @return  JTable	A database object
	 */
	public function getTable($type = 'Extension', $prefix = 'JTable', $config = array())
	{
		return JTable::getInstance($type, $prefix, $config);
	}

	/**
	 * Auto-populate the model state.
	 *
	 * Note. Calling getState in this method will result in recursion.
	 *
	 * @return  void
	 *
	 * @since   1.6
	 */
	protected function populateState()
	{
		// Execute the parent method.
		parent::populateState();

		$app = JFactory::getApplication('administrator');

		// Load the User state.
		$pk = $app->input->getInt('extension_id');
		$this->setState('plugin.id', $pk);
	}

	/**
	 * Preprocess the form.
	 *
	 * @param   JForm   $form   A form object.
	 * @param   mixed   $data   The data expected for the form.
	 * @param   string  $group  Cache group name.
	 *
	 * @return  mixed  True if successful.
	 *
	 * @throws	Exception if there is an error in the form event.
	 * @since   1.6
	 */
	protected function preprocessForm(JForm $form, $data, $group = 'content')
	{
		jimport('joomla.filesystem.path');

		$folder  = $this->getState('item.folder');
		$element = $this->getState('item.element');
		$lang    = JFactory::getLanguage();

		// Load the core and/or local language sys file(s) for the ordering field.
		$db    = $this->getDbo();
		$query = $db->getQuery(true)
			->select($db->quoteName('element'))
			->from($db->quoteName('#__extensions'))
			->where($db->quoteName('type') . ' = ' . $db->quote('plugin'))
			->where($db->quoteName('folder') . ' = ' . $db->quote($folder));
		$db->setQuery($query);
		$elements = $db->loadColumn();

		foreach ($elements as $elementa)
		{
			$lang->load('plg_' . $folder . '_' . $elementa . '.sys', JPATH_ADMINISTRATOR, null, false, true)
			|| $lang->load('plg_' . $folder . '_' . $elementa . '.sys', JPATH_PLUGINS . '/' . $folder . '/' . $elementa, null, false, true);
		}

		if (empty($folder) || empty($element))
		{
			$app = JFactory::getApplication();
			$app->redirect(JRoute::_('index.php?option=com_plugins&view=plugins', false));
		}

		$formFile = JPath::clean(JPATH_PLUGINS . '/' . $folder . '/' . $element . '/' . $element . '.xml');

		if (!file_exists($formFile))
		{
			throw new Exception(JText::sprintf('COM_PLUGINS_ERROR_FILE_NOT_FOUND', $element . '.xml'));
		}

		// Load the core and/or local language file(s).
			$lang->load('plg_' . $folder . '_' . $element, JPATH_ADMINISTRATOR, null, false, true)
		||	$lang->load('plg_' . $folder . '_' . $element, JPATH_PLUGINS . '/' . $folder . '/' . $element, null, false, true);

		if (file_exists($formFile))
		{
			// Get the plugin form.
			if (!$form->loadFile($formFile, false, '//config'))
			{
				throw new Exception(JText::_('JERROR_LOADFILE_FAILED'));
			}
		}

		// Attempt to load the xml file.
		if (!$xml = simplexml_load_file($formFile))
		{
			throw new Exception(JText::_('JERROR_LOADFILE_FAILED'));
		}

		// Get the help data from the XML file if present.
		$help = $xml->xpath('/extension/help');

		if (!empty($help))
		{
			$helpKey = trim((string) $help[0]['key']);
			$helpURL = trim((string) $help[0]['url']);

			$this->helpKey = $helpKey ? $helpKey : $this->helpKey;
			$this->helpURL = $helpURL ? $helpURL : $this->helpURL;
		}

		// Trigger the default form events.
		parent::preprocessForm($form, $data, $group);
	}

	/**
	 * A protected method to get a set of ordering conditions.
	 *
	 * @param   object  $table  A record object.
	 *
	 * @return  array  An array of conditions to add to add to ordering queries.
	 *
	 * @since   1.6
	 */
	protected function getReorderConditions($table)
	{
		$condition = array();
		$condition[] = 'type = ' . $this->_db->quote($table->type);
		$condition[] = 'folder = ' . $this->_db->quote($table->folder);

		return $condition;
	}

	/**
	 * Override method to save the form data.
	 *
	 * @param   array  $data  The form data.
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   1.6
	 */
	public function save($data)
	{
		// Setup type.
		$data['type'] = 'plugin';

		return parent::save($data);
	}

	/**
	 * Get the necessary data to load an item help screen.
	 *
	 * @return  object  An object with key, url, and local properties for loading the item help screen.
	 *
	 * @since   1.6
	 */
	public function getHelp()
	{
		return (object) array('key' => $this->helpKey, 'url' => $this->helpURL);
	}

	/**
	 * Custom clean cache method, plugins are cached in 2 places for different clients.
	 *
	 * @param   string   $group      Cache group name.
	 * @param   integer  $client_id  Application client id.
	 *
	 * @return  void
	 *
	 * @since   1.6
	 */
	protected function cleanCache($group = null, $client_id = 0)
	{
		parent::cleanCache('com_plugins', 0);
		parent::cleanCache('com_plugins', 1);
	}
}
