<?php

/*
 * This file is part of Contao.
 *
 * (c) Leo Feyer
 *
 * @license LGPL-3.0-or-later
 */


/**
 * Load tl_content language file
 */
System::loadLanguageFile('tl_content');


/**
 * Table tl_calendar_events
 */
$GLOBALS['TL_DCA']['tl_calendar_events'] = array
(

	// Config
	'config' => array
	(
		'dataContainer'               => 'Table',
		'ptable'                      => 'tl_calendar',
		'ctable'                      => array('tl_content'),
		'switchToEdit'                => true,
		'enableVersioning'            => true,
		'onload_callback' => array
		(
			array('tl_calendar_events', 'checkPermission'),
			array('tl_calendar_events', 'generateFeed')
		),
		'oncut_callback' => array
		(
			array('tl_calendar_events', 'scheduleUpdate')
		),
		'ondelete_callback' => array
		(
			array('tl_calendar_events', 'scheduleUpdate')
		),
		'onsubmit_callback' => array
		(
			array('tl_calendar_events', 'adjustTime'),
			array('tl_calendar_events', 'scheduleUpdate')
		),
		'sql' => array
		(
			'keys' => array
			(
				'id' => 'primary',
				'alias' => 'index',
				'pid,start,stop,published' => 'index'
			)
		)
	),

	// List
	'list' => array
	(
		'sorting' => array
		(
			'mode'                    => 4,
			'fields'                  => array('startTime DESC'),
			'headerFields'            => array('title', 'jumpTo', 'tstamp', 'protected', 'allowComments'),
			'panelLayout'             => 'filter;sort,search,limit',
			'child_record_callback'   => array('tl_calendar_events', 'listEvents'),
			'child_record_class'      => 'no_padding'
		),
		'global_operations' => array
		(
			'all' => array
			(
				'label'               => &$GLOBALS['TL_LANG']['MSC']['all'],
				'href'                => 'act=select',
				'class'               => 'header_edit_all',
				'attributes'          => 'onclick="Backend.getScrollOffset()" accesskey="e"'
			)
		),
		'operations' => array
		(
			'edit' => array
			(
				'label'               => &$GLOBALS['TL_LANG']['tl_calendar_events']['edit'],
				'href'                => 'table=tl_content',
				'icon'                => 'edit.gif'
			),
			'editheader' => array
			(
				'label'               => &$GLOBALS['TL_LANG']['tl_calendar_events']['editmeta'],
				'href'                => 'act=edit',
				'icon'                => 'header.gif'
			),
			'copy' => array
			(
				'label'               => &$GLOBALS['TL_LANG']['tl_calendar_events']['copy'],
				'href'                => 'act=paste&amp;mode=copy',
				'icon'                => 'copy.gif'
			),
			'cut' => array
			(
				'label'               => &$GLOBALS['TL_LANG']['tl_calendar_events']['cut'],
				'href'                => 'act=paste&amp;mode=cut',
				'icon'                => 'cut.gif'
			),
			'delete' => array
			(
				'label'               => &$GLOBALS['TL_LANG']['tl_calendar_events']['delete'],
				'href'                => 'act=delete',
				'icon'                => 'delete.gif',
				'attributes'          => 'onclick="if(!confirm(\'' . $GLOBALS['TL_LANG']['MSC']['deleteConfirm'] . '\'))return false;Backend.getScrollOffset()"'
			),
			'toggle' => array
			(
				'label'               => &$GLOBALS['TL_LANG']['tl_calendar_events']['toggle'],
				'icon'                => 'visible.gif',
				'attributes'          => 'onclick="Backend.getScrollOffset();return AjaxRequest.toggleVisibility(this,%s)"',
				'button_callback'     => array('tl_calendar_events', 'toggleIcon')
			),
			'show' => array
			(
				'label'               => &$GLOBALS['TL_LANG']['tl_calendar_events']['show'],
				'href'                => 'act=show',
				'icon'                => 'show.gif'
			)
		)
	),

	// Palettes
	'palettes' => array
	(
		'__selector__'                => array('addTime', 'addImage', 'recurring', 'addEnclosure', 'source'),
		'default'                     => '{title_legend},title,alias,author;{date_legend},addTime,startDate,endDate;{details_legend},location,teaser;{image_legend},addImage;{recurring_legend},recurring;{enclosure_legend:hide},addEnclosure;{source_legend:hide},source;{expert_legend:hide},cssClass,noComments;{publish_legend},published,start,stop'
	),

	// Subpalettes
	'subpalettes' => array
	(
		'addTime'                     => 'startTime,endTime',
		'addImage'                    => 'singleSRC,alt,size,imagemargin,imageUrl,fullsize,caption,floating',
		'recurring'                   => 'repeatEach,recurrences',
		'addEnclosure'                => 'enclosure',
		'source_internal'             => 'jumpTo',
		'source_article'              => 'articleId',
		'source_external'             => 'url,target'
	),

	// Fields
	'fields' => array
	(
		'id' => array
		(
			'sql'                     => "int(10) unsigned NOT NULL auto_increment"
		),
		'pid' => array
		(
			'foreignKey'              => 'tl_calendar.title',
			'sql'                     => "int(10) unsigned NOT NULL default '0'",
			'relation'                => array('type'=>'belongsTo', 'load'=>'eager')
		),
		'tstamp' => array
		(
			'sql'                     => "int(10) unsigned NOT NULL default '0'"
		),
		'title' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['title'],
			'exclude'                 => true,
			'search'                  => true,
			'sorting'                 => true,
			'flag'                    => 1,
			'inputType'               => 'text',
			'eval'                    => array('mandatory'=>true, 'maxlength'=>255),
			'sql'                     => "varchar(255) NOT NULL default ''"
		),
		'alias' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['alias'],
			'exclude'                 => true,
			'search'                  => true,
			'inputType'               => 'text',
			'eval'                    => array('rgxp'=>'alias', 'doNotCopy'=>true, 'unique'=>true, 'maxlength'=>128, 'tl_class'=>'w50'),
			'save_callback' => array
			(
				array('tl_calendar_events', 'generateAlias')
			),
			'sql'                     => "varchar(128) COLLATE utf8_bin NOT NULL default ''"
		),
		'author' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['author'],
			'default'                 => BackendUser::getInstance()->id,
			'exclude'                 => true,
			'search'                  => true,
			'filter'                  => true,
			'sorting'                 => true,
			'flag'                    => 11,
			'inputType'               => 'select',
			'foreignKey'              => 'tl_user.name',
			'eval'                    => array('doNotCopy'=>true, 'chosen'=>true, 'mandatory'=>true, 'includeBlankOption'=>true, 'tl_class'=>'w50'),
			'sql'                     => "int(10) unsigned NOT NULL default '0'",
			'relation'                => array('type'=>'hasOne', 'load'=>'eager')
		),
		'addTime' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['addTime'],
			'exclude'                 => true,
			'inputType'               => 'checkbox',
			'eval'                    => array('submitOnChange'=>true, 'doNotCopy'=>true),
			'sql'                     => "char(1) NOT NULL default ''"
		),
		'startTime' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['startTime'],
			'default'                 => time(),
			'exclude'                 => true,
			'filter'                  => true,
			'sorting'                 => true,
			'flag'                    => 8,
			'inputType'               => 'text',
			'eval'                    => array('rgxp'=>'time', 'mandatory'=>true, 'doNotCopy'=>true, 'tl_class'=>'w50'),
			'sql'                     => "int(10) unsigned NULL"
		),
		'endTime' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['endTime'],
			'default'                 => time(),
			'exclude'                 => true,
			'inputType'               => 'text',
			'eval'                    => array('rgxp'=>'time', 'doNotCopy'=>true, 'tl_class'=>'w50'),
			'save_callback' => array
			(
				array('tl_calendar_events', 'setEmptyEndTime')
			),
			'sql'                     => "int(10) unsigned NULL"
		),
		'startDate' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['startDate'],
			'exclude'                 => true,
			'inputType'               => 'text',
			'eval'                    => array('rgxp'=>'date', 'mandatory'=>true, 'doNotCopy'=>true, 'datepicker'=>true, 'tl_class'=>'w50 wizard'),
			'sql'                     => "int(10) unsigned NULL"
		),
		'endDate' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['endDate'],
			'default'                 => null,
			'exclude'                 => true,
			'inputType'               => 'text',
			'eval'                    => array('rgxp'=>'date', 'doNotCopy'=>true, 'datepicker'=>true, 'tl_class'=>'w50 wizard'),
			'save_callback' => array
			(
				array('tl_calendar_events', 'setEmptyEndDate')
			),
			'sql'                     => "int(10) unsigned NULL"
		),
		'location' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['location'],
			'exclude'                 => true,
			'search'                  => true,
			'inputType'               => 'text',
			'eval'                    => array('maxlength'=>255, 'tl_class'=>'long'),
			'sql'                     => "varchar(255) NOT NULL default ''"
		),
		'teaser' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['teaser'],
			'exclude'                 => true,
			'search'                  => true,
			'inputType'               => 'textarea',
			'eval'                    => array('rte'=>'tinyMCE', 'tl_class'=>'clr'),
			'sql'                     => "text NULL"
		),
		'addImage' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['addImage'],
			'exclude'                 => true,
			'inputType'               => 'checkbox',
			'eval'                    => array('submitOnChange'=>true),
			'sql'                     => "char(1) NOT NULL default ''"
		),
		'singleSRC' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_content']['singleSRC'],
			'exclude'                 => true,
			'inputType'               => 'fileTree',
			'eval'                    => array('filesOnly'=>true, 'extensions'=>Config::get('validImageTypes'), 'fieldType'=>'radio', 'mandatory'=>true),
			'save_callback' => array
			(
				array('tl_calendar_events', 'storeFileMetaInformation')
			),
			'sql'                     => "binary(16) NULL"
		),
		'alt' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_content']['alt'],
			'exclude'                 => true,
			'search'                  => true,
			'inputType'               => 'text',
			'eval'                    => array('maxlength'=>255, 'tl_class'=>'long'),
			'sql'                     => "varchar(255) NOT NULL default ''"
		),
		'size' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_content']['size'],
			'exclude'                 => true,
			'inputType'               => 'imageSize',
			'options'                 => System::getImageSizes(),
			'reference'               => &$GLOBALS['TL_LANG']['MSC'],
			'eval'                    => array('rgxp'=>'natural', 'includeBlankOption'=>true, 'nospace'=>true, 'helpwizard'=>true, 'tl_class'=>'w50'),
			'sql'                     => "varchar(64) NOT NULL default ''"
		),
		'imagemargin' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_content']['imagemargin'],
			'exclude'                 => true,
			'inputType'               => 'trbl',
			'options'                 => $GLOBALS['TL_CSS_UNITS'],
			'eval'                    => array('includeBlankOption'=>true, 'tl_class'=>'w50'),
			'sql'                     => "varchar(128) NOT NULL default ''"
		),
		'imageUrl' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_content']['imageUrl'],
			'exclude'                 => true,
			'search'                  => true,
			'inputType'               => 'text',
			'eval'                    => array('rgxp'=>'url', 'decodeEntities'=>true, 'maxlength'=>255, 'fieldType'=>'radio', 'filesOnly'=>true, 'tl_class'=>'w50 wizard'),
			'wizard' => array
			(
				array('tl_calendar_events', 'pagePicker')
			),
			'sql'                     => "varchar(255) NOT NULL default ''"
		),
		'fullsize' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_content']['fullsize'],
			'exclude'                 => true,
			'inputType'               => 'checkbox',
			'eval'                    => array('tl_class'=>'w50 m12'),
			'sql'                     => "char(1) NOT NULL default ''"
		),
		'caption' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_content']['caption'],
			'exclude'                 => true,
			'search'                  => true,
			'inputType'               => 'text',
			'eval'                    => array('maxlength'=>255, 'allowHtml'=>true, 'tl_class'=>'w50'),
			'sql'                     => "varchar(255) NOT NULL default ''"
		),
		'floating' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_content']['floating'],
			'default'                 => 'above',
			'exclude'                 => true,
			'inputType'               => 'radioTable',
			'options'                 => array('above', 'left', 'right', 'below'),
			'eval'                    => array('cols'=>4, 'tl_class'=>'w50'),
			'reference'               => &$GLOBALS['TL_LANG']['MSC'],
			'sql'                     => "varchar(32) NOT NULL default ''"
		),
		'recurring' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['recurring'],
			'exclude'                 => true,
			'filter'                  => true,
			'inputType'               => 'checkbox',
			'eval'                    => array('submitOnChange'=>true),
			'sql'                     => "char(1) NOT NULL default ''"
		),
		'repeatEach' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['repeatEach'],
			'exclude'                 => true,
			'inputType'               => 'timePeriod',
			'options'                 => array('days', 'weeks', 'months', 'years'),
			'reference'               => &$GLOBALS['TL_LANG']['tl_calendar_events'],
			'eval'                    => array('mandatory'=>true, 'rgxp'=>'natural', 'minval'=>1, 'tl_class'=>'w50'),
			'sql'                     => "varchar(64) NOT NULL default ''"
		),
		'repeatEnd' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['repeatEnd'],
			'sql'                     => "int(10) unsigned NOT NULL default '0'"
		),
		'recurrences' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['recurrences'],
			'exclude'                 => true,
			'inputType'               => 'text',
			'eval'                    => array('mandatory'=>true, 'rgxp'=>'natural', 'tl_class'=>'w50'),
			'sql'                     => "smallint(5) unsigned NOT NULL default '0'"
		),
		'addEnclosure' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['addEnclosure'],
			'exclude'                 => true,
			'inputType'               => 'checkbox',
			'eval'                    => array('submitOnChange'=>true),
			'sql'                     => "char(1) NOT NULL default ''"
		),
		'enclosure' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['enclosure'],
			'exclude'                 => true,
			'inputType'               => 'fileTree',
			'eval'                    => array('multiple'=>true, 'fieldType'=>'checkbox', 'filesOnly'=>true, 'isDownloads'=>true, 'extensions'=>Config::get('allowedDownload'), 'mandatory'=>true),
			'sql'                     => "blob NULL"
		),
		'source' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['source'],
			'default'                 => 'default',
			'exclude'                 => true,
			'filter'                  => true,
			'inputType'               => 'radio',
			'options_callback'        => array('tl_calendar_events', 'getSourceOptions'),
			'reference'               => &$GLOBALS['TL_LANG']['tl_calendar_events'],
			'eval'                    => array('submitOnChange'=>true, 'helpwizard'=>true),
			'sql'                     => "varchar(32) NOT NULL default ''"
		),
		'jumpTo' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['jumpTo'],
			'exclude'                 => true,
			'inputType'               => 'pageTree',
			'foreignKey'              => 'tl_page.title',
			'eval'                    => array('mandatory'=>true, 'fieldType'=>'radio'),
			'sql'                     => "int(10) unsigned NOT NULL default '0'",
			'relation'                => array('type'=>'belongsTo', 'load'=>'lazy')
		),
		'articleId' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['articleId'],
			'exclude'                 => true,
			'inputType'               => 'select',
			'options_callback'        => array('tl_calendar_events', 'getArticleAlias'),
			'eval'                    => array('chosen'=>true, 'mandatory'=>true),
			'sql'                     => "int(10) unsigned NOT NULL default '0'"
		),
		'url' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['MSC']['url'],
			'exclude'                 => true,
			'search'                  => true,
			'inputType'               => 'text',
			'eval'                    => array('mandatory'=>true, 'decodeEntities'=>true, 'maxlength'=>255, 'tl_class'=>'w50'),
			'sql'                     => "varchar(255) NOT NULL default ''"
		),
		'target' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['MSC']['target'],
			'exclude'                 => true,
			'inputType'               => 'checkbox',
			'eval'                    => array('tl_class'=>'w50 m12'),
			'sql'                     => "char(1) NOT NULL default ''"
		),
		'cssClass' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['cssClass'],
			'exclude'                 => true,
			'inputType'               => 'text',
			'eval'                    => array('tl_class'=>'w50'),
			'sql'                     => "varchar(255) NOT NULL default ''"
		),
		'noComments' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['noComments'],
			'exclude'                 => true,
			'filter'                  => true,
			'inputType'               => 'checkbox',
			'eval'                    => array('tl_class'=>'w50 m12'),
			'sql'                     => "char(1) NOT NULL default ''"
		),
		'published' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['published'],
			'exclude'                 => true,
			'filter'                  => true,
			'flag'                    => 2,
			'inputType'               => 'checkbox',
			'eval'                    => array('doNotCopy'=>true),
			'sql'                     => "char(1) NOT NULL default ''"
		),
		'start' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['start'],
			'exclude'                 => true,
			'inputType'               => 'text',
			'eval'                    => array('rgxp'=>'datim', 'datepicker'=>true, 'tl_class'=>'w50 wizard'),
			'sql'                     => "varchar(10) NOT NULL default ''"
		),
		'stop' => array
		(
			'label'                   => &$GLOBALS['TL_LANG']['tl_calendar_events']['stop'],
			'exclude'                 => true,
			'inputType'               => 'text',
			'eval'                    => array('rgxp'=>'datim', 'datepicker'=>true, 'tl_class'=>'w50 wizard'),
			'sql'                     => "varchar(10) NOT NULL default ''"
		)
	)
);


/**
 * Provide miscellaneous methods that are used by the data configuration array.
 *
 * @author Leo Feyer <https://github.com/leofeyer>
 */
class tl_calendar_events extends Backend
{

	/**
	 * Import the back end user object
	 */
	public function __construct()
	{
		parent::__construct();
		$this->import('BackendUser', 'User');
	}


	/**
	 * Check permissions to edit table tl_calendar_events
	 */
	public function checkPermission()
	{
		// HOOK: comments extension required
		if (!in_array('comments', ModuleLoader::getActive()))
		{
			$key = array_search('allowComments', $GLOBALS['TL_DCA']['tl_calendar_events']['list']['sorting']['headerFields']);
			unset($GLOBALS['TL_DCA']['tl_calendar_events']['list']['sorting']['headerFields'][$key]);
		}

		if ($this->User->isAdmin)
		{
			return;
		}

		// Set root IDs
		if (!is_array($this->User->calendars) || empty($this->User->calendars))
		{
			$root = array(0);
		}
		else
		{
			$root = $this->User->calendars;
		}

		$id = strlen(Input::get('id')) ? Input::get('id') : CURRENT_ID;

		// Check current action
		switch (Input::get('act'))
		{
			case 'paste':
			case 'select':
				if (!in_array(CURRENT_ID, $root)) // check CURRENT_ID here (see #247)
				{
					$this->log('Not enough permissions to access calendar ID "'.$id.'"', __METHOD__, TL_ERROR);
					$this->redirect('contao/main.php?act=error');
				}
				break;

			case 'create':
				if (!strlen(Input::get('pid')) || !in_array(Input::get('pid'), $root))
				{
					$this->log('Not enough permissions to create events in calendar ID "'.Input::get('pid').'"', __METHOD__, TL_ERROR);
					$this->redirect('contao/main.php?act=error');
				}
				break;

			case 'cut':
			case 'copy':
				if (!in_array(Input::get('pid'), $root))
				{
					$this->log('Not enough permissions to '.Input::get('act').' event ID "'.$id.'" to calendar ID "'.Input::get('pid').'"', __METHOD__, TL_ERROR);
					$this->redirect('contao/main.php?act=error');
				}
				// NO BREAK STATEMENT HERE

			case 'edit':
			case 'show':
			case 'delete':
			case 'toggle':
				$objCalendar = $this->Database->prepare("SELECT pid FROM tl_calendar_events WHERE id=?")
											  ->limit(1)
											  ->execute($id);

				if ($objCalendar->numRows < 1)
				{
					$this->log('Invalid event ID "'.$id.'"', __METHOD__, TL_ERROR);
					$this->redirect('contao/main.php?act=error');
				}

				if (!in_array($objCalendar->pid, $root))
				{
					$this->log('Not enough permissions to '.Input::get('act').' event ID "'.$id.'" of calendar ID "'.$objCalendar->pid.'"', __METHOD__, TL_ERROR);
					$this->redirect('contao/main.php?act=error');
				}
				break;

			case 'editAll':
			case 'deleteAll':
			case 'overrideAll':
			case 'cutAll':
			case 'copyAll':
				if (!in_array($id, $root))
				{
					$this->log('Not enough permissions to access calendar ID "'.$id.'"', __METHOD__, TL_ERROR);
					$this->redirect('contao/main.php?act=error');
				}

				$objCalendar = $this->Database->prepare("SELECT id FROM tl_calendar_events WHERE pid=?")
											  ->execute($id);

				if ($objCalendar->numRows < 1)
				{
					$this->log('Invalid calendar ID "'.$id.'"', __METHOD__, TL_ERROR);
					$this->redirect('contao/main.php?act=error');
				}

				$session = $this->Session->getData();
				$session['CURRENT']['IDS'] = array_intersect($session['CURRENT']['IDS'], $objCalendar->fetchEach('id'));
				$this->Session->setData($session);
				break;

			default:
				if (strlen(Input::get('act')))
				{
					$this->log('Invalid command "'.Input::get('act').'"', __METHOD__, TL_ERROR);
					$this->redirect('contao/main.php?act=error');
				}
				elseif (!in_array($id, $root))
				{
					$this->log('Not enough permissions to access calendar ID "'.$id.'"', __METHOD__, TL_ERROR);
					$this->redirect('contao/main.php?act=error');
				}
				break;
		}
	}


	/**
	 * Auto-generate the event alias if it has not been set yet
	 *
	 * @param mixed         $varValue
	 * @param DataContainer $dc
	 *
	 * @return mixed
	 *
	 * @throws Exception
	 */
	public function generateAlias($varValue, DataContainer $dc)
	{
		$autoAlias = false;

		// Generate alias if there is none
		if ($varValue == '')
		{
			$autoAlias = true;
			$varValue = StringUtil::generateAlias($dc->activeRecord->title);
		}

		$objAlias = $this->Database->prepare("SELECT id FROM tl_calendar_events WHERE alias=?")
								   ->execute($varValue);

		// Check whether the alias exists
		if ($objAlias->numRows > 1 && !$autoAlias)
		{
			throw new Exception(sprintf($GLOBALS['TL_LANG']['ERR']['aliasExists'], $varValue));
		}

		// Add ID to alias
		if ($objAlias->numRows && $autoAlias)
		{
			$varValue .= '-' . $dc->id;
		}

		return $varValue;
	}


	/**
	 * Automatically set the end time if not set
	 *
	 * @param mixed         $varValue
	 * @param DataContainer $dc
	 *
	 * @return string
	 */
	public function setEmptyEndTime($varValue, DataContainer $dc)
	{
		if ($varValue === '')
		{
			$varValue = $dc->activeRecord->startTime;
		}

		return $varValue;
	}


	/**
	 * Set the end date to null if empty
	 *
	 * @param mixed $varValue
	 *
	 * @return mixed
	 */
	public function setEmptyEndDate($varValue)
	{
		if ($varValue === '')
		{
			$varValue = null;
		}

		return $varValue;
	}


	/**
	 * Add the type of input field
	 *
	 * @param array $arrRow
	 *
	 * @return string
	 */
	public function listEvents($arrRow)
	{
		$span = Calendar::calculateSpan($arrRow['startTime'], $arrRow['endTime']);

		if ($span > 0)
		{
			$date = Date::parse(Config::get(($arrRow['addTime'] ? 'datimFormat' : 'dateFormat')), $arrRow['startTime']) . $GLOBALS['TL_LANG']['MSC']['cal_timeSeparator'] . Date::parse(Config::get(($arrRow['addTime'] ? 'datimFormat' : 'dateFormat')), $arrRow['endTime']);
		}
		elseif ($arrRow['startTime'] == $arrRow['endTime'])
		{
			$date = Date::parse(Config::get('dateFormat'), $arrRow['startTime']) . ($arrRow['addTime'] ? ' ' . Date::parse(Config::get('timeFormat'), $arrRow['startTime']) : '');
		}
		else
		{
			$date = Date::parse(Config::get('dateFormat'), $arrRow['startTime']) . ($arrRow['addTime'] ? ' ' . Date::parse(Config::get('timeFormat'), $arrRow['startTime']) . $GLOBALS['TL_LANG']['MSC']['cal_timeSeparator'] . Date::parse(Config::get('timeFormat'), $arrRow['endTime']) : '');
		}

		return '<div class="tl_content_left">' . $arrRow['title'] . ' <span style="color:#b3b3b3;padding-left:3px">[' . $date . ']</span></div>';
	}


	/**
	 * Get all articles and return them as array
	 *
	 * @param DataContainer $dc
	 *
	 * @return array
	 */
	public function getArticleAlias(DataContainer $dc)
	{
		$arrPids = array();
		$arrAlias = array();

		if (!$this->User->isAdmin)
		{
			foreach ($this->User->pagemounts as $id)
			{
				$arrPids[] = $id;
				$arrPids = array_merge($arrPids, $this->Database->getChildRecords($id, 'tl_page'));
			}

			if (empty($arrPids))
			{
				return $arrAlias;
			}

			$objAlias = $this->Database->prepare("SELECT a.id, a.title, a.inColumn, p.title AS parent FROM tl_article a LEFT JOIN tl_page p ON p.id=a.pid WHERE a.pid IN(". implode(',', array_map('intval', array_unique($arrPids))) .") ORDER BY parent, a.sorting")
									   ->execute($dc->id);
		}
		else
		{
			$objAlias = $this->Database->prepare("SELECT a.id, a.title, a.inColumn, p.title AS parent FROM tl_article a LEFT JOIN tl_page p ON p.id=a.pid ORDER BY parent, a.sorting")
									   ->execute($dc->id);
		}

		if ($objAlias->numRows)
		{
			System::loadLanguageFile('tl_article');

			while ($objAlias->next())
			{
				$arrAlias[$objAlias->parent][$objAlias->id] = $objAlias->title . ' (' . ($GLOBALS['TL_LANG']['COLS'][$objAlias->inColumn] ?: $objAlias->inColumn) . ', ID ' . $objAlias->id . ')';
			}
		}

		return $arrAlias;
	}


	/**
	 * Add the source options depending on the allowed fields (see #5498)
	 *
	 * @param DataContainer $dc
	 *
	 * @return array
	 */
	public function getSourceOptions(DataContainer $dc)
	{
		if ($this->User->isAdmin)
		{
			return array('default', 'internal', 'article', 'external');
		}

		$arrOptions = array('default');

		// Add the "internal" option
		if ($this->User->hasAccess('tl_calendar_events::jumpTo', 'alexf'))
		{
			$arrOptions[] = 'internal';
		}

		// Add the "article" option
		if ($this->User->hasAccess('tl_calendar_events::articleId', 'alexf'))
		{
			$arrOptions[] = 'article';
		}

		// Add the "external" option
		if ($this->User->hasAccess('tl_calendar_events::url', 'alexf'))
		{
			$arrOptions[] = 'external';
		}

		// Add the option currently set
		if ($dc->activeRecord && $dc->activeRecord->source != '')
		{
			$arrOptions[] = $dc->activeRecord->source;
			$arrOptions = array_unique($arrOptions);
		}

		return $arrOptions;
	}


	/**
	 * Adjust start end end time of the event based on date, span, startTime and endTime
	 *
	 * @param DataContainer $dc
	 */
	public function adjustTime(DataContainer $dc)
	{
		// Return if there is no active record (override all)
		if (!$dc->activeRecord)
		{
			return;
		}

		$arrSet['startTime'] = $dc->activeRecord->startDate;
		$arrSet['endTime'] = $dc->activeRecord->startDate;

		// Set end date
		if (strlen($dc->activeRecord->endDate))
		{
			if ($dc->activeRecord->endDate > $dc->activeRecord->startDate)
			{
				$arrSet['endDate'] = $dc->activeRecord->endDate;
				$arrSet['endTime'] = $dc->activeRecord->endDate;
			}
			else
			{
				$arrSet['endDate'] = $dc->activeRecord->startDate;
				$arrSet['endTime'] = $dc->activeRecord->startDate;
			}
		}

		// Add time
		if ($dc->activeRecord->addTime)
		{
			$arrSet['startTime'] = strtotime(date('Y-m-d', $arrSet['startTime']) . ' ' . date('H:i:s', $dc->activeRecord->startTime));
			$arrSet['endTime'] = strtotime(date('Y-m-d', $arrSet['endTime']) . ' ' . date('H:i:s', $dc->activeRecord->endTime));
		}

		// Adjust end time of "all day" events
		elseif ((strlen($dc->activeRecord->endDate) && $arrSet['endDate'] == $arrSet['endTime']) || $arrSet['startTime'] == $arrSet['endTime'])
		{
			$arrSet['endTime'] = (strtotime('+ 1 day', $arrSet['endTime']) - 1);
		}

		$arrSet['repeatEnd'] = 0;

		// Recurring events
		if ($dc->activeRecord->recurring)
		{
			// Unlimited recurrences end on 2038-01-01 00:00:00 (see #4862)
			if ($dc->activeRecord->recurrences == 0)
			{
				$arrSet['repeatEnd'] = 2145913200;
			}
			else
			{
				$arrRange = deserialize($dc->activeRecord->repeatEach);

				if (is_array($arrRange) && isset($arrRange['unit']) && isset($arrRange['value']))
				{
					$arg = $arrRange['value'] * $dc->activeRecord->recurrences;
					$unit = $arrRange['unit'];

					$strtotime = '+ ' . $arg . ' ' . $unit;
					$arrSet['repeatEnd'] = strtotime($strtotime, $arrSet['endTime']);
				}
			}
		}

		$this->Database->prepare("UPDATE tl_calendar_events %s WHERE id=?")->set($arrSet)->execute($dc->id);
	}


	/**
	 * Check for modified calendar feeds and update the XML files if necessary
	 */
	public function generateFeed()
	{
		$session = $this->Session->get('calendar_feed_updater');

		if (!is_array($session) || empty($session))
		{
			return;
		}

		$this->import('Calendar');

		foreach ($session as $id)
		{
			$this->Calendar->generateFeedsByCalendar($id);
		}

		$this->import('Automator');
		$this->Automator->generateSitemap();

		$this->Session->set('calendar_feed_updater', null);
	}


	/**
	 * Schedule a calendar feed update
	 *
	 * This method is triggered when a single event or multiple events are
	 * modified (edit/editAll), moved (cut/cutAll) or deleted (delete/deleteAll).
	 * Since duplicated events are unpublished by default, it is not necessary
	 * to schedule updates on copyAll as well.
	 *
	 * @param DataContainer $dc
	 */
	public function scheduleUpdate(DataContainer $dc)
	{
		// Return if there is no ID
		if (!$dc->activeRecord || !$dc->activeRecord->pid || Input::get('act') == 'copy')
		{
			return;
		}

		// Store the ID in the session
		$session = $this->Session->get('calendar_feed_updater');
		$session[] = $dc->activeRecord->pid;
		$this->Session->set('calendar_feed_updater', array_unique($session));
	}


	/**
	 * Return the link picker wizard
	 *
	 * @param DataContainer $dc
	 *
	 * @return string
	 */
	public function pagePicker(DataContainer $dc)
	{
		return ' <a href="' . (($dc->value == '' || strpos($dc->value, '{{link_url::') !== false) ? 'contao/page.php' : 'contao/file.php') . '?do=' . Input::get('do') . '&amp;table=' . $dc->table . '&amp;field=' . $dc->field . '&amp;value=' . rawurlencode(str_replace(array('{{link_url::', '}}'), '', $dc->value)) . '&amp;switch=1' . '" title="' . specialchars($GLOBALS['TL_LANG']['MSC']['pagepicker']) . '" onclick="Backend.getScrollOffset();Backend.openModalSelector({\'width\':768,\'title\':\'' . specialchars(str_replace("'", "\\'", $GLOBALS['TL_DCA'][$dc->table]['fields'][$dc->field]['label'][0])) . '\',\'url\':this.href,\'id\':\'' . $dc->field . '\',\'tag\':\'ctrl_'. $dc->field . ((Input::get('act') == 'editAll') ? '_' . $dc->id : '') . '\',\'self\':this});return false">' . Image::getHtml('pickpage.gif', $GLOBALS['TL_LANG']['MSC']['pagepicker'], 'style="vertical-align:top;cursor:pointer"') . '</a>';
	}


	/**
	 * Pre-fill the "alt" and "caption" fields with the file meta data
	 *
	 * @param mixed         $varValue
	 * @param DataContainer $dc
	 *
	 * @return mixed
	 */
	public function storeFileMetaInformation($varValue, DataContainer $dc)
	{
		if ($dc->activeRecord->singleSRC != $varValue)
		{
			$this->addFileMetaInformationToRequest($varValue, 'tl_calendar', $dc->activeRecord->pid);
		}

		return $varValue;
	}


	/**
	 * Return the "toggle visibility" button
	 *
	 * @param array  $row
	 * @param string $href
	 * @param string $label
	 * @param string $title
	 * @param string $icon
	 * @param string $attributes
	 *
	 * @return string
	 */
	public function toggleIcon($row, $href, $label, $title, $icon, $attributes)
	{
		if (strlen(Input::get('tid')))
		{
			$this->toggleVisibility(Input::get('tid'), (Input::get('state') == 1), (@func_get_arg(12) ?: null));
			$this->redirect($this->getReferer());
		}

		// Check permissions AFTER checking the tid, so hacking attempts are logged
		if (!$this->User->hasAccess('tl_calendar_events::published', 'alexf'))
		{
			return '';
		}

		$href .= '&amp;tid='.$row['id'].'&amp;state='.($row['published'] ? '' : 1);

		if (!$row['published'])
		{
			$icon = 'invisible.gif';
		}

		return '<a href="'.$this->addToUrl($href).'" title="'.specialchars($title).'"'.$attributes.'>'.Image::getHtml($icon, $label, 'data-state="' . ($row['published'] ? 1 : 0) . '"').'</a> ';
	}


	/**
	 * Disable/enable a user group
	 *
	 * @param integer        $intId
	 * @param boolean        $blnVisible
	 * @param DataContainer $dc
	 */
	public function toggleVisibility($intId, $blnVisible, DataContainer $dc=null)
	{
		// Set the ID and action
		Input::setGet('id', $intId);
		Input::setGet('act', 'toggle');

		if ($dc)
		{
			$dc->id = $intId; // see #8043
		}

		$this->checkPermission();

		// Check the field access
		if (!$this->User->hasAccess('tl_calendar_events::published', 'alexf'))
		{
			$this->log('Not enough permissions to publish/unpublish event ID "'.$intId.'"', __METHOD__, TL_ERROR);
			$this->redirect('contao/main.php?act=error');
		}

		$objVersions = new Versions('tl_calendar_events', $intId);
		$objVersions->initialize();

		// Trigger the save_callback
		if (is_array($GLOBALS['TL_DCA']['tl_calendar_events']['fields']['published']['save_callback']))
		{
			foreach ($GLOBALS['TL_DCA']['tl_calendar_events']['fields']['published']['save_callback'] as $callback)
			{
				if (is_array($callback))
				{
					$this->import($callback[0]);
					$blnVisible = $this->{$callback[0]}->{$callback[1]}($blnVisible, ($dc ?: $this));
				}
				elseif (is_callable($callback))
				{
					$blnVisible = $callback($blnVisible, ($dc ?: $this));
				}
			}
		}

		// Update the database
		$this->Database->prepare("UPDATE tl_calendar_events SET tstamp=". time() .", published='" . ($blnVisible ? '1' : '') . "' WHERE id=?")
					   ->execute($intId);

		$objVersions->create();

		// Update the RSS feed (for some reason it does not work without sleep(1))
		sleep(1);
		$this->import('Calendar');
		$this->Calendar->generateFeedsByCalendar(CURRENT_ID);
	}
}
