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<?php
/**
 * @package     Joomla.Site
 * @subpackage  com_config
 *
 * @copyright   (C) 2013 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\Component\Config\Site\Model;

\defined('_JEXEC') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\Form\Form;
use Joomla\CMS\Language\Text;
use Joomla\CMS\MVC\Model\FormModel as BaseForm;
use Joomla\CMS\Plugin\PluginHelper;
use Joomla\Utilities\ArrayHelper;

/**
 * Prototype form model.
 *
 * @see    JForm
 * @see    \Joomla\CMS\Form\FormField
 * @see    \Joomla\CMS\Form\FormRule
 * @since  3.2
 */
abstract class FormModel extends BaseForm
{
	/**
	 * Array of form objects.
	 *
	 * @var    array
	 * @since  3.2
	 */
	protected $forms = array();

/**
	 * Method to checkin a row.
	 *
	 * @param   integer  $pk  The numeric id of the primary key.
	 *
	 * @return  boolean  False on failure or error, true otherwise.
	 *
	 * @since   3.2
	 * @throws  \RuntimeException
	 */
	public function checkin($pk = null)
	{
		// Only attempt to check the row in if it exists.
		if ($pk)
		{
			$user = Factory::getUser();

// Get an instance of the row to checkin.
			$table = $this->getTable();

if (!$table->load($pk))
			{
				throw new \RuntimeException($table->getError());
			}

// Check if this is the user has previously checked out the row.
			if (!is_null($table->checked_out) && $table->checked_out != $user->get('id') && !$user->authorise('core.admin', 'com_checkin'))
			{
				throw new \RuntimeException($table->getError());
			}

// Attempt to check the row in.
			if (!$table->checkIn($pk))
			{
				throw new \RuntimeException($table->getError());
			}
		}

return true;
	}

/**
	 * Method to check-out a row for editing.
	 *
	 * @param   integer  $pk  The numeric id of the primary key.
	 *
	 * @return  boolean  False on failure or error, true otherwise.
	 *
	 * @since   3.2
	 */
	public function checkout($pk = null)
	{
		// Only attempt to check the row in if it exists.
		if ($pk)
		{
			$user = Factory::getUser();

// Get an instance of the row to checkout.
			$table = $this->getTable();

if (!$table->load($pk))
			{
				throw new \RuntimeException($table->getError());
			}

// Check if this is the user having previously checked out the row.
			if (!is_null($table->checked_out) && $table->checked_out != $user->get('id'))
			{
				throw new \RuntimeException(Text::_('JLIB_APPLICATION_ERROR_CHECKOUT_USER_MISMATCH'));
			}

// Attempt to check the row out.
			if (!$table->checkOut($user->get('id'), $pk))
			{
				throw new \RuntimeException($table->getError());
			}
		}

return true;
	}

/**
	 * Method to get a form object.
	 *
	 * @param   string   $name     The name of the form.
	 * @param   string   $source   The form source. Can be XML string if file flag is set to false.
	 * @param   array    $options  Optional array of options for the form creation.
	 * @param   boolean  $clear    Optional argument to force load a new form.
	 * @param   string   $xpath    An optional xpath to search for the fields.
	 *
	 * @return  mixed  JForm object on success, False on error.
	 *
	 * @see     JForm
	 * @since   3.2
	 */
	protected function loadForm($name, $source = null, $options = array(), $clear = false, $xpath = false)
	{
		// Handle the optional arguments.
		$options['control'] = ArrayHelper::getValue($options, 'control', false);

// Create a signature hash.
		$hash = sha1($source . serialize($options));

// Check if we can use a previously loaded form.
		if (isset($this->_forms[$hash]) && !$clear)
		{
			return $this->_forms[$hash];
		}

//  Register the paths for the form.
		Form::addFormPath(JPATH_SITE . '/components/com_config/forms');
		Form::addFormPath(JPATH_ADMINISTRATOR . '/components/com_config/forms');

try
		{
			// Get the form.
			$form = Form::getInstance($name, $source, $options, false, $xpath);

if (isset($options['load_data']) && $options['load_data'])
			{
				// Get the data for the form.
				$data = $this->loadFormData();
			}
			else
			{
				$data = array();
			}

// Allow for additional modification of the form, and events to be triggered.
			// We pass the data because plugins may require it.
			$this->preprocessForm($form, $data);

// Load the data into the form after the plugins have operated.
			$form->bind($data);
		}
		catch (\Exception $e)
		{
			Factory::getApplication()->enqueueMessage($e->getMessage());

return false;
		}

// Store the form for later.
		$this->_forms[$hash] = $form;

return $form;
	}

/**
	 * Method to get the data that should be injected in the form.
	 *
	 * @return  array    The default data is an empty array.
	 *
	 * @since   3.2
	 */
	protected function loadFormData()
	{
		return array();
	}

/**
	 * Method to allow derived classes to preprocess the data.
	 *
	 * @param   string  $context  The context identifier.
	 * @param   mixed   &$data    The data to be processed. It gets altered directly.
	 * @param   string  $group    The name of the plugin group to import (defaults to "content").
	 *
	 * @return  void
	 *
	 * @since   3.2
	 */
	protected function preprocessData($context, &$data, $group = 'content')
	{
		// Get the dispatcher and load the users plugins.
		PluginHelper::importPlugin('content');

// Trigger the data preparation event.
		Factory::getApplication()->triggerEvent('onContentPrepareData', array($context, $data));
	}

/**
	 * Method to allow derived classes to preprocess the form.
	 *
	 * @param   Form    $form   A Form object.
	 * @param   mixed   $data   The data expected for the form.
	 * @param   string  $group  The name of the plugin group to import (defaults to "content").
	 *
	 * @return  void
	 *
	 * @see     \Joomla\CMS\Form\FormField
	 * @since   3.2
	 * @throws  \Exception if there is an error in the form event.
	 */
	protected function preprocessForm(Form $form, $data, $group = 'content')
	{
		// Import the appropriate plugin group.
		PluginHelper::importPlugin($group);

// Trigger the form preparation event.
		Factory::getApplication()->triggerEvent('onContentPrepareForm', array($form, $data));
	}

/**
	 * Method to validate the form data.
	 *
	 * @param   Form    $form   The form to validate against.
	 * @param   array   $data   The data to validate.
	 * @param   string  $group  The name of the field group to validate.
	 *
	 * @return  mixed  Array of filtered data if valid, false otherwise.
	 *
	 * @see     \Joomla\CMS\Form\FormRule
	 * @see     JFilterInput
	 * @since   3.2
	 */
	public function validate($form, $data, $group = null)
	{
		// Filter and validate the form data.
		$data   = $form->filter($data);
		$return = $form->validate($data, $group);

// Check for an error.
		if ($return instanceof \Exception)
		{
			Factory::getApplication()->enqueueMessage($return->getMessage(), 'error');

return false;
		}

// Check the validation results.
		if ($return === false)
		{
			// Get the validation messages from the form.
			foreach ($form->getErrors() as $message)
			{
				if ($message instanceof \Exception)
				{
					$message = $message->getMessage();
				}

Factory::getApplication()->enqueueMessage($message, 'error');
			}

return false;
		}

return $data;
	}
}