<?php
/**
 * @package     Joomla.Site
 * @subpackage  com_config
 *
 * @copyright   Copyright (C) 2005 - 2017 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;

/**
 * Prototype admin model.
 *
 * @since  3.2
 */
abstract class ConfigModelCms extends JModelDatabase
{
	/**
	 * The model (base) name
	 *
	 * @var    string
	 * @since  3.2
	 */
	protected $name;

	/**
	 * The URL option for the component.
	 *
	 * @var    string
	 * @since  3.2
	 */
	protected $option = null;

	/**
	 * The prefix to use with controller messages.
	 *
	 * @var    string
	 * @since  3.2
	 */
	protected $text_prefix = null;

	/**
	 * Indicates if the internal state has been set
	 *
	 * @var    boolean
	 * @since  3.2
	 */
	protected $__state_set = null;

	/**
	 * Constructor
	 *
	 * @param   array  $config  An array of configuration options (name, state, dbo, table_path, ignore_request).
	 *
	 * @since   3.2
	 * @throws  Exception
	 */
	public function __construct($config = array())
	{
		// Guess the option from the class name (Option)Model(View).
		if (empty($this->option))
		{
			$r = null;

			if (!preg_match('/(.*)Model/i', get_class($this), $r))
			{
				throw new Exception(JText::_('JLIB_APPLICATION_ERROR_MODEL_GET_NAME'), 500);
			}

			$this->option = 'com_' . strtolower($r[1]);
		}

		// Set the view name
		if (empty($this->name))
		{
			if (array_key_exists('name', $config))
			{
				$this->name = $config['name'];
			}
			else
			{
				$this->name = $this->getName();
			}
		}

		// Set the model state
		if (array_key_exists('state', $config))
		{
			$this->state = $config['state'];
		}
		else
		{
			$this->state = new Registry;
		}

		// Set the model dbo
		if (array_key_exists('dbo', $config))
		{
			$this->db = $config['dbo'];
		}

		// Register the paths for the form
		$paths = $this->registerTablePaths($config);

		// Set the internal state marker - used to ignore setting state from the request
		if (!empty($config['ignore_request']))
		{
			$this->__state_set = true;
		}

		// Set the clean cache event
		if (isset($config['event_clean_cache']))
		{
			$this->event_clean_cache = $config['event_clean_cache'];
		}
		elseif (empty($this->event_clean_cache))
		{
			$this->event_clean_cache = 'onContentCleanCache';
		}

		$state = new Registry($config);

		parent::__construct($state);
	}

	/**
	 * Method to get the model name
	 *
	 * The model name. By default parsed using the classname or it can be set
	 * by passing a $config['name'] in the class constructor
	 *
	 * @return  string  The name of the model
	 *
	 * @since   3.2
	 * @throws  Exception
	 */
	public function getName()
	{
		if (empty($this->name))
		{
			$r = null;

			if (!preg_match('/Model(.*)/i', get_class($this), $r))
			{
				throw new Exception(JText::_('JLIB_APPLICATION_ERROR_MODEL_GET_NAME'), 500);
			}

			$this->name = strtolower($r[1]);
		}

		return $this->name;
	}

	/**
	 * Method to get model state variables
	 *
	 * @return  object  The property where specified, the state object where omitted
	 *
	 * @since   3.2
	 */
	public function getState()
	{
		if (!$this->__state_set)
		{
			// Protected method to auto-populate the model state.
			$this->populateState();

			// Set the model state set flag to true.
			$this->__state_set = true;
		}

		return $this->state;
	}

	/**
	 * Method to register paths for tables
	 *
	 * @param   array  $config  Configuration array
	 *
	 * @return  object  The property where specified, the state object where omitted
	 *
	 * @since   3.2
	 */
	public function registerTablePaths($config = array())
	{
		// Set the default view search path
		if (array_key_exists('table_path', $config))
		{
			$this->addTablePath($config['table_path']);
		}
		elseif (defined('JPATH_COMPONENT_ADMINISTRATOR'))
		{
			// Register the paths for the form
			$paths = new SplPriorityQueue;
			$paths->insert(JPATH_COMPONENT_ADMINISTRATOR . '/table', 'normal');

			// For legacy purposes. Remove for 4.0
			$paths->insert(JPATH_COMPONENT_ADMINISTRATOR . '/tables', 'normal');
		}
	}

	/**
	 * Clean the cache
	 *
	 * @param   string   $group      The cache group
	 * @param   integer  $client_id  The ID of the client
	 *
	 * @return  void
	 *
	 * @since   3.2
	 */
	protected function cleanCache($group = null, $client_id = 0)
	{
		$conf = JFactory::getConfig();
		$dispatcher = JEventDispatcher::getInstance();

		$options = array(
			'defaultgroup' => $group ?: (isset($this->option) ? $this->option : JFactory::getApplication()->input->get('option')),
			'cachebase' => $client_id ? JPATH_ADMINISTRATOR . '/cache' : $conf->get('cache_path', JPATH_SITE . '/cache'));

		$cache = JCache::getInstance('callback', $options);
		$cache->clean();

		// Trigger the onContentCleanCache event.
		$dispatcher->trigger($this->event_clean_cache, $options);
	}

	/**
	 * Method to auto-populate the model state.
	 *
	 * This method should only be called once per instantiation and is designed
	 * to be called on the first call to the getState() method unless the model
	 * configuration flag to ignore the request is set.
	 *
	 * @return  void
	 *
	 * @note    Calling getState in this method will result in recursion.
	 * @since   3.2
	 */
	protected function populateState()
	{
		$this->loadState();
	}

	/**
	 * Method to test whether a record can be deleted.
	 *
	 * @param   object  $record  A record object.
	 *
	 * @return  boolean  True if allowed to delete the record. Defaults to the permission set in the component.
	 *
	 * @since   3.2
	 */
	protected function canDelete($record)
	{
		if (!empty($record->id))
		{
			if ($record->published != -2)
			{
				return false;
			}

			$user = JFactory::getUser();

			return $user->authorise('core.delete', $this->option);
		}
	}

	/**
	 * Method to test whether a record can have its state changed.
	 *
	 * @param   object  $record  A record object.
	 *
	 * @return  boolean  True if allowed to change the state of the record. Defaults to the permission set in the component.
	 *
	 * @since   3.2
	 */
	protected function canEditState($record)
	{
		$user = JFactory::getUser();

		return $user->authorise('core.edit.state', $this->option);
	}
}
