<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_banners
 *
 * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

/**
 * Banner model.
 *
 * @package     Joomla.Administrator
 * @subpackage  com_banners
 * @since       1.6
 */
class BannersModelBanner extends JModelAdmin
{
	/**
	 * @var    string  The prefix to use with controller messages.
	 * @since  1.6
	 */
	protected $text_prefix = 'COM_BANNERS_BANNER';

	/**
	 * Method to perform batch operations on an item or a set of items.
	 *
	 * @param   array   $commands   An array of commands to perform.
	 * @param   array   $pks        An array of item ids.
	 * @param   array   $contexts   An array of item contexts.
	 *
	 * @return  boolean   Returns true on success, false on failure.
	 *
	 * @since	2.5
	 */
	public function batch($commands, $pks, $contexts)
	{
		// Sanitize user ids.
		$pks = array_unique($pks);
		JArrayHelper::toInteger($pks);

		// Remove any values of zero.
		if (array_search(0, $pks, true))
		{
			unset($pks[array_search(0, $pks, true)]);
		}

		if (empty($pks))
		{
			$this->setError(JText::_('JGLOBAL_NO_ITEM_SELECTED'));
			return false;
		}

		$done = false;

		if (!empty($commands['category_id']))
		{
			$cmd = JArrayHelper::getValue($commands, 'move_copy', 'c');

			if ($cmd == 'c')
			{
				$result = $this->batchCopy($commands['category_id'], $pks, $contexts);
				if (is_array($result))
				{
					$pks = $result;
				}
				else
				{
					return false;
				}
			}
			elseif ($cmd == 'm' && !$this->batchMove($commands['category_id'], $pks, $contexts))
			{
				return false;
			}
			$done = true;
		}

		if (strlen($commands['client_id']) > 0)
		{
			if (!$this->batchClient($commands['client_id'], $pks, $contexts))
			{
				return false;
			}

			$done = true;
		}

		if (!empty($commands['language_id']))
		{
			if (!$this->batchLanguage($commands['language_id'], $pks, $contexts))
			{
				return false;
			}

			$done = true;
		}

		if (!$done)
		{
			$this->setError(JText::_('JLIB_APPLICATION_ERROR_INSUFFICIENT_BATCH_INFORMATION'));
			return false;
		}

		// Clear the cache
		$this->cleanCache();

		return true;
	}

	/**
	 * Batch client changes for a group of banners.
	 *
	 * @param   string  $value     The new value matching a client.
	 * @param   array   $pks       An array of row IDs.
	 * @param   array   $contexts  An array of item contexts.
	 *
	 * @return  boolean  True if successful, false otherwise and internal error is set.
	 *
	 * @since   2.5
	 */
	protected function batchClient($value, $pks, $contexts)
	{
		// Set the variables
		$user = JFactory::getUser();
		$table = $this->getTable();

		foreach ($pks as $pk)
		{
			if ($user->authorise('core.edit', $contexts[$pk]))
			{
				$table->reset();
				$table->load($pk);
				$table->cid = (int) $value;

				if (!$table->store())
				{
					$this->setError($table->getError());
					return false;
				}
			}
			else
			{
				$this->setError(JText::_('JLIB_APPLICATION_ERROR_BATCH_CANNOT_EDIT'));
				return false;
			}
		}

		// Clean the cache
		$this->cleanCache();

		return true;
	}

	/**
	 * Batch copy items to a new category or current.
	 *
	 * @param   integer  $value     The new category.
	 * @param   array    $pks       An array of row IDs.
	 * @param   array    $contexts  An array of item contexts.
	 *
	 * @return  mixed  An array of new IDs on success, boolean false on failure.
	 *
	 * @since	2.5
	 */
	protected function batchCopy($value, $pks, $contexts)
	{
		$categoryId = (int) $value;

		$table = $this->getTable();
		$i = 0;

		// Check that the category exists
		if ($categoryId)
		{
			$categoryTable = JTable::getInstance('Category');
			if (!$categoryTable->load($categoryId))
			{
				if ($error = $categoryTable->getError())
				{
					// Fatal error
					$this->setError($error);
					return false;
				}
				else
				{
					$this->setError(JText::_('JLIB_APPLICATION_ERROR_BATCH_MOVE_CATEGORY_NOT_FOUND'));
					return false;
				}
			}
		}

		if (empty($categoryId))
		{
			$this->setError(JText::_('JLIB_APPLICATION_ERROR_BATCH_MOVE_CATEGORY_NOT_FOUND'));
			return false;
		}

		// Check that the user has create permission for the component
		$user = JFactory::getUser();
		if (!$user->authorise('core.create', 'com_banners.category.' . $categoryId))
		{
			$this->setError(JText::_('JLIB_APPLICATION_ERROR_BATCH_CANNOT_CREATE'));
			return false;
		}

		// Parent exists so we let's proceed
		while (!empty($pks))
		{
			// Pop the first ID off the stack
			$pk = array_shift($pks);

			$table->reset();

			// Check that the row actually exists
			if (!$table->load($pk))
			{
				if ($error = $table->getError())
				{
					// Fatal error
					$this->setError($error);
					return false;
				}
				else
				{
					// Not fatal error
					$this->setError(JText::sprintf('JLIB_APPLICATION_ERROR_BATCH_MOVE_ROW_NOT_FOUND', $pk));
					continue;
				}
			}

			// Alter the title & alias
			$data = $this->generateNewTitle($categoryId, $table->alias, $table->name);
			$table->name = $data['0'];
			$table->alias = $data['1'];

			// Reset the ID because we are making a copy
			$table->id = 0;

			// New category ID
			$table->catid = $categoryId;

			// TODO: Deal with ordering?
			//$table->ordering	= 1;

			// Check the row.
			if (!$table->check())
			{
				$this->setError($table->getError());
				return false;
			}

			// Store the row.
			if (!$table->store())
			{
				$this->setError($table->getError());
				return false;
			}

			// Get the new item ID
			$newId = $table->get('id');

			// Add the new ID to the array
			$newIds[$i]	= $newId;
			$i++;
		}

		// Clean the cache
		$this->cleanCache();

		return $newIds;
	}

	/**
	 * Method to test whether a record can be deleted.
	 *
	 * @param   object  $record  A record object.
	 *
	 * @return  boolean  True if allowed to delete the record. Defaults to the permission set in the component.
	 *
	 * @since   1.6
	 */
	protected function canDelete($record)
	{
		if (!empty($record->id))
		{
			if ($record->state != -2)
			{
				return;
			}
			$user = JFactory::getUser();

			if (!empty($record->catid))
			{
				return $user->authorise('core.delete', 'com_banners.category.' . (int) $record->catid);
			}
			else
			{
				return parent::canDelete($record);
			}
		}
	}

	/**
	 * Method to test whether a record can have its state changed.
	 *
	 * @param   object  $record  A record object.
	 *
	 * @return  boolean  True if allowed to change the state of the record. Defaults to the permission set in the component.
	 *
	 * @since   1.6
	 */
	protected function canEditState($record)
	{
		$user = JFactory::getUser();

		// Check against the category.
		if (!empty($record->catid))
		{
			return $user->authorise('core.edit.state', 'com_banners.category.' . (int) $record->catid);
		}
		// Default to component settings if category not known.
		else
		{
			return parent::canEditState($record);
		}
	}

	/**
	 * Returns a JTable object, always creating it.
	 *
	 * @param   string  $type    The table type to instantiate. [optional]
	 * @param   string  $prefix  A prefix for the table class name. [optional]
	 * @param   array   $config  Configuration array for model. [optional]
	 *
	 * @return  JTable  A database object
	 *
	 * @since   1.6
	 */
	public function getTable($type = 'Banner', $prefix = 'BannersTable', $config = array())
	{
		return JTable::getInstance($type, $prefix, $config);
	}

	/**
	 * Method to get the record form.
	 *
	 * @param   array    $data      Data for the form. [optional]
	 * @param   boolean  $loadData  True if the form is to load its own data (default case), false if not. [optional]
	 *
	 * @return  mixed  A JForm object on success, false on failure
	 *
	 * @since   1.6
	 */
	public function getForm($data = array(), $loadData = true)
	{
		// Get the form.
		$form = $this->loadForm('com_banners.banner', 'banner', array('control' => 'jform', 'load_data' => $loadData));
		if (empty($form))
		{
			return false;
		}

		// Determine correct permissions to check.
		if ($this->getState('banner.id'))
		{
			// Existing record. Can only edit in selected categories.
			$form->setFieldAttribute('catid', 'action', 'core.edit');
		}
		else
		{
			// New record. Can only create in selected categories.
			$form->setFieldAttribute('catid', 'action', 'core.create');
		}

		// Modify the form based on access controls.
		if (!$this->canEditState((object) $data))
		{
			// Disable fields for display.
			$form->setFieldAttribute('ordering', 'disabled', 'true');
			$form->setFieldAttribute('publish_up', 'disabled', 'true');
			$form->setFieldAttribute('publish_down', 'disabled', 'true');
			$form->setFieldAttribute('state', 'disabled', 'true');
			$form->setFieldAttribute('sticky', '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('publish_up', 'filter', 'unset');
			$form->setFieldAttribute('publish_down', 'filter', 'unset');
			$form->setFieldAttribute('state', 'filter', 'unset');
			$form->setFieldAttribute('sticky', '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.
		$app  = JFactory::getApplication();
		$data = $app->getUserState('com_banners.edit.banner.data', array());

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

			// Prime some default values.
			if ($this->getState('banner.id') == 0)
			{
				$data->set('catid', $app->input->getInt('catid', $app->getUserState('com_banners.banners.filter.category_id')));
			}
		}

		return $data;
	}

	/**
	 * Method to stick records.
	 *
	 * @param   array    &$pks   The ids of the items to publish.
	 * @param   integer  $value  The value of the published state
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   1.6
	 */
	public function stick(&$pks, $value = 1)
	{
		$user = JFactory::getUser();
		$table = $this->getTable();
		$pks = (array) $pks;

		// Access checks.
		foreach ($pks as $i => $pk)
		{
			if ($table->load($pk))
			{
				if (!$this->canEditState($table))
				{
					// Prune items that you can't change.
					unset($pks[$i]);
					JError::raiseWarning(403, JText::_('JLIB_APPLICATION_ERROR_EDITSTATE_NOT_PERMITTED'));
				}
			}
		}

		// Attempt to change the state of the records.
		if (!$table->stick($pks, $value, $user->get('id')))
		{
			$this->setError($table->getError());
			return false;
		}

		return true;
	}

	/**
	 * A protected method to get a set of ordering conditions.
	 *
	 * @param   JTable  $table  A record object.
	 *
	 * @return  array  An array of conditions to add to add to ordering queries.
	 *
	 * @since   1.6
	 */
	protected function getReorderConditions($table)
	{
		$condition = array();
		$condition[] = 'catid = '. (int) $table->catid;
		$condition[] = 'state >= 0';
		return $condition;
	}

	/**
	 * @since  3.0
	 */
	protected function prepareTable($table)
	{
		$date = JFactory::getDate();
		$user = JFactory::getUser();

		if (empty($table->id))
		{
			// Set the values
			$table->created	= $date->toSql();

			// Set ordering to the last item if not set
			if (empty($table->ordering))
			{
				$db = JFactory::getDbo();
				$db->setQuery('SELECT MAX(ordering) FROM #__banners');
				$max = $db->loadResult();

				$table->ordering = $max + 1;
			}
		}
		else
		{
			// Set the values
			$table->modified	= $date->toSql();
			$table->modified_by	= $user->get('id');
		}
		// Increment the content version number.
		$table->version++;
	}
}
