<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_workflow
 *
 * @copyright   (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 * @since       4.0.0
 */
namespace Joomla\Component\Workflow\Administrator\Model;

\defined('_JEXEC') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\Form\Form;
use Joomla\CMS\MVC\Model\AdminModel;
use Joomla\CMS\Plugin\PluginHelper;
use Joomla\Registry\Registry;
use Joomla\String\StringHelper;

/**
 * Model class for transition
 *
 * @since  4.0.0
 */
class TransitionModel extends AdminModel
{
	/**
	 * Auto-populate the model state.
	 *
	 * Note. Calling getState in this method will result in recursion.
	 *
	 * @return  void
	 *
	 * @since   4.0.0
	 */
	public function populateState()
	{
		parent::populateState();

		$app       = Factory::getApplication();
		$context   = $this->option . '.' . $this->name;
		$extension = $app->getUserStateFromRequest($context . '.filter.extension', 'extension', null, 'cmd');

		$this->setState('filter.extension', $extension);
	}

	/**
	 * Method to test whether a record can be deleted.
	 *
	 * @param   object  $record  A record object.
	 *
	 * @return  boolean  True if allowed to delete the record. Defaults to the permission for the component.
	 *
	 * @since  4.0.0
	 */
	protected function canDelete($record)
	{
		if (empty($record->id) || $record->published != -2)
		{
			return false;
		}

		$app = Factory::getApplication();
		$extension = $app->getUserStateFromRequest('com_workflow.transition.filter.extension', 'extension', null, 'cmd');

		return Factory::getUser()->authorise('core.delete', $extension . '.transition.' . (int) $record->id);
	}

	/**
	 * Method to test whether a record can have its state changed.
	 *
	 * @param   object  $record  A record object.
	 *
	 * @return  boolean  True if allowed to change the state of the record. Defaults to the permission set in the component.
	 *
	 * @since   4.0.0
	 */
	protected function canEditState($record)
	{
		$user = Factory::getUser();
		$app = Factory::getApplication();
		$context = $this->option . '.' . $this->name;
		$extension = $app->getUserStateFromRequest($context . '.filter.extension', 'extension', null, 'cmd');

		if (!\property_exists($record, 'workflow_id'))
		{
			$workflowID          = $app->getUserStateFromRequest($context . '.filter.workflow_id', 'workflow_id', 0, 'int');
			$record->workflow_id = $workflowID;
		}

		// Check for existing workflow.
		if (!empty($record->id))
		{
			return $user->authorise('core.edit.state', $extension . '.transition.' . (int) $record->id);
		}

		// Default to component settings if workflow isn't known.
		return $user->authorise('core.edit.state', $extension);
	}

	/**
	 * Method to get a single record.
	 *
	 * @param   integer  $pk  The id of the primary key.
	 *
	 * @return  CMSObject|boolean  Object on success, false on failure.
	 *
	 * @since   4.0.0
	 */
	public function getItem($pk = null)
	{
		$item = parent::getItem($pk);

		if (property_exists($item, 'options'))
		{
			$registry = new Registry($item->options);
			$item->options = $registry->toArray();
		}

		return $item;
	}

	/**
	 * Method to save the form data.
	 *
	 * @param   array  $data  The form data.
	 *
	 * @return   boolean  True on success.
	 *
	 * @since  4.0.0
	 */
	public function save($data)
	{
		$table      = $this->getTable();
		$context    = $this->option . '.' . $this->name;
		$app		= Factory::getApplication();
		$user       = $app->getIdentity();
		$input		= $app->input;

		$workflowID = $app->getUserStateFromRequest($context . '.filter.workflow_id', 'workflow_id', 0, 'int');

		if (empty($data['workflow_id']))
		{
			$data['workflow_id'] = $workflowID;
		}

		$workflow = $this->getTable('Workflow');

		$workflow->load($data['workflow_id']);

		$parts = explode('.', $workflow->extension);

		if (isset($data['rules']) && !$user->authorise('core.admin', $parts[0]))
		{
			unset($data['rules']);
		}

		// Make sure we use the correct workflow_id when editing an existing transition
		$key = $table->getKeyName();
		$pk  = (isset($data[$key])) ? $data[$key] : (int) $this->getState($this->getName() . '.id');

		if ($pk > 0)
		{
			$table->load($pk);

			if ((int) $table->workflow_id)
			{
				$data['workflow_id'] = (int) $table->workflow_id;
			}
		}

		if ($input->get('task') == 'save2copy')
		{
			$origTable = clone $this->getTable();

			// Alter the title for save as copy
			if ($origTable->load(['title' => $data['title']]))
			{
				list($title) = $this->generateNewTitle(0, '', $data['title']);
				$data['title'] = $title;
			}

			$data['published'] = 0;
		}

		return parent::save($data);
	}

	/**
	 * Method to change the title
	 *
	 * @param   integer  $categoryId  The id of the category.
	 * @param   string   $alias       The alias.
	 * @param   string   $title       The title.
	 *
	 * @return	array  Contains the modified title and alias.
	 *
	 * @since	4.0.0
	 */
	protected function generateNewTitle($categoryId, $alias, $title)
	{
		// Alter the title & alias
		$table = $this->getTable();

		while ($table->load(array('title' => $title)))
		{
			$title = StringHelper::increment($title);
		}

		return array($title, $alias);
	}

	/**
	 * Abstract method for getting the form from the model.
	 *
	 * @param   array    $data      Data for the form.
	 * @param   boolean  $loadData  True if the form is to load its own data (default case), false if not.
	 *
	 * @return \JForm|boolean  A JForm object on success, false on failure
	 *
	 * @since  4.0.0
	 */
	public function getForm($data = array(), $loadData = true)
	{
		// Get the form.
		$form = $this->loadForm(
			'com_workflow.transition',
			'transition',
			array(
				'control' => 'jform',
				'load_data' => $loadData
			)
		);

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

		$id = $data['id'] ?? $form->getValue('id');

		$item = $this->getItem($id);

		$canEditState = $this->canEditState((object) $item);

		// Modify the form based on access controls.
		if (!$canEditState)
		{
			$form->setFieldAttribute('published', 'disabled', 'true');
			$form->setFieldAttribute('published', 'required', 'false');
			$form->setFieldAttribute('published', 'filter', 'unset');
		}

		if (!empty($item->workflow_id))
		{
			$data['workflow_id'] = (int) $item->workflow_id;
		}

		if (empty($data['workflow_id']))
		{
			$context = $this->option . '.' . $this->name;

			$data['workflow_id'] = (int) Factory::getApplication()->getUserStateFromRequest(
				$context . '.filter.workflow_id', 'workflow_id',
				0,
				'int'
			);
		}

		$where = $this->getDbo()->quoteName('workflow_id') . ' = ' . (int) $data['workflow_id'];
		$where .= ' AND ' . $this->getDbo()->quoteName('published') . ' = 1';

		$form->setFieldAttribute('from_stage_id', 'sql_where', $where);
		$form->setFieldAttribute('to_stage_id', 'sql_where', $where);

		return $form;
	}

	/**
	 * Method to get the data that should be injected in the form.
	 *
	 * @return mixed  The data for the form.
	 *
	 * @since  4.0.0
	 */
	protected function loadFormData()
	{
		// Check the session for previously entered form data.
		$data = Factory::getApplication()->getUserState(
			'com_workflow.edit.transition.data',
			array()
		);

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

		return $data;
	}

	public function getWorkflow()
	{
		$app = Factory::getApplication();

		$context = $this->option . '.' . $this->name;

		$workflow_id = (int) $app->getUserStateFromRequest($context . '.filter.workflow_id', 'workflow_id', 0, 'int');

		$workflow = $this->getTable('Workflow');

		$workflow->load($workflow_id);

		return (object) $workflow->getProperties();
	}

	/**
	 * Trigger the form preparation for the workflow group
	 *
	 * @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     FormField
	 * @since   4.0.0
	 * @throws  \Exception if there is an error in the form event.
	 */
	protected function preprocessForm(Form $form, $data, $group = 'content')
	{
		$extension = Factory::getApplication()->input->get('extension');

		$parts = explode('.', $extension);

		$extension = array_shift($parts);

		// Set the access control rules field component value.
		$form->setFieldAttribute('rules', 'component', $extension);

		// Import the appropriate plugin group.
		PluginHelper::importPlugin('workflow');

		parent::preprocessForm($form, $data, $group);
	}
}
