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Filename : class-evo-ajax.php
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<?php
/**
 * EventON Ajax Handlers
 * Handles AJAX requests via wp_ajax hook (both admin and front-end events)
 *
 * @author 		AJDE
 * @category 	Core
 * @package 	EventON/Functions/AJAX
 * @version     2.9
 */

class evo_ajax{
	/**
	 * Hook into ajax events
	 */
	public function __construct(){
		$ajax_events = array(
			'init_load'=>'init_load',			
			'ajax_events_data'=>'ajax_events_data',			
			'the_ajax_hook'=>'main_ajax_call',			
			'load_event_content'=>'load_event_content',
			'load_single_eventcard_content'=>'load_single_eventcard_content',
			'ics_download'=>'eventon_ics_download',			
			'export_events_ics'=>'export_events_ics',
			'search_evo_events'=>'search_evo_events',
			'get_local_event_time'=>'get_local_event_time',
			'refresh_now_cal'=>'refresh_now_cal',

		);
		foreach ( $ajax_events as $ajax_event => $class ) {
			$prepend = ( in_array($ajax_event, array('the_ajax_hook','evo_dynamic_css','the_post_ajax_hook_3','the_post_ajax_hook_2')) )? '': 'eventon_';
			add_action( 'wp_ajax_'. $prepend . $ajax_event, array( $this, $class ) );
			add_action( 'wp_ajax_nopriv_'. $prepend . $ajax_event, array( $this, $class ) );
		}
	}	

	// Initial load
		function callback($name, $nonce){
			$name = str_replace('eventon_', '', $name);
			if(!wp_verify_nonce( $nonce, 'rest_'.EVO()->version)) return false;
			return call_user_func_array(array($this, $name),array(true) );
		}
		function init_load($return = false){
			// get global cals on init
			global $EVOAJAX;		

			// init load calendar events
			$CALS = array();
			if(isset($_POST['cals']) && is_array($_POST['cals'])){
				foreach($_POST['cals'] as $calid=>$CD){
					if(!isset( $CD['sc'])) continue;

					$CALS[$calid]['sc']= $CD['sc'];

					EVO()->calendar->process_arguments( $CD['sc'] );

					// get events for the calendar
					$E = EVO()->calendar->_generate_events(
						'both',	apply_filters('evo_init_ajax_wparg_additions',array())
					);

					$CALS[$calid]['json'] = $E['data'];
					$CALS[$calid]['html'] = $E['html'];
					$CALS[$calid]['debug'] = date('Y-m-d H:i', $CD['sc']['focus_start_date_range']).'-'.date('Y-m-d H:i', $CD['sc']['focus_end_date_range']);
				}
			}

			$global = isset($_POST['global'])? $_POST['global']: array();

			$R =  apply_filters('evo_init_ajax_data', array(
				'cal_def'=> EVO()->calendar->helper->get_calendar_defaults(),
				'temp'=> EVO()->temp->get_init(),
				'dms' => array(
					'd'=> EVO()->cal->get_all_day_names(),
					'd3'=> EVO()->cal->get_all_day_names('three'),
					'd1'=> EVO()->cal->get_all_day_names('one'),
					'm'=> EVO()->cal->_get_all_month_names(),
					'm3'=> EVO()->cal->_get_all_month_names('short'),
				),		
				'cals'=> apply_filters('evo_init_ajax_cals',$CALS),		
				'txt'=> array(
					'no_events'=> evo_lang_get('evcal_lang_noeve','No Events'),
					'all_day'=> evo_lang_get('evcal_lang_allday','All Day'),
					'event_completed'=> evo_lang('Event Completed'),
				), // language translated texts for client side
				'terms'=> array(),
			), $global);

			if($return){ return $R; }else{ echo json_encode($R);	}
			exit;

		}

	// Primary function to load event data 
		function main_ajax_call(){
			$shortcode_args = $focused_month_num = $focused_year = '';
			$status = 'GOOD';

			$SC = isset($_POST['shortcode']) ? $_POST['shortcode']: array();
			$ajaxtype = isset($_POST['ajaxtype'])? $_POST['ajaxtype']: '';

			extract($SC);

			if(empty($number_of_months)){ return false; exit; }
			if($number_of_months < 1){ return false; exit; }

			EVO()->calendar->shortcode_args = $SC;
							
			// date range calculation
				if( isset($SC['focus_start_date_range']) && isset($SC['focus_end_date_range']) ){
					$focus_start_date_range = (int)$SC['focus_start_date_range'];
					$focus_end_date_range = (int)$SC['focus_end_date_range'];
				}

				$calendar_type = 'default';
				// event list with more than one month
				if( $SC['number_of_months']==1){

					// calculate new date range if calendar direction is changing
					if($_POST['direction'] !='none'){
						if(!empty($fixed_month) && !empty($fixed_year)){
							$fixed_year = ($_POST['direction']=='next')? 
								(($fixed_month==12)? $fixed_year+1:$fixed_year):
								(($fixed_month==1)? $fixed_year-1:$fixed_year);

							$fixed_month = ($_POST['direction']=='next')?
								(($fixed_month==12)? 1:$fixed_month+1):
								(($fixed_month==1)? 12:$fixed_month-1);													

							$DD = new DateTime();
							$DD->setTimezone( EVO()->calendar->timezone0 );
							$DD->setDate($fixed_year,$fixed_month,1 );
							$DD->setTime(0,0,0);

							$SC['fixed_month'] = $fixed_month;
							$SC['fixed_year'] = $fixed_year;
							$SC['focus_start_date_range'] = $DD->format('U');
							$DD->modify('last day of this month');
							$DD->setTime(23,59,59);
							$SC['focus_end_date_range'] = $DD->format('U');							
						}
					}else{ // not switching months

						// Going to today
						if($ajaxtype == 'today' || $ajaxtype == 'jumper'){
							$SC['focus_start_date_range']='';
							$SC['focus_end_date_range']='';	
							EVO()->calendar->shortcode_args = $SC;						
							EVO()->calendar->shell->set_calendar_range();	
							$SC = EVO()->calendar->shortcode_args;
						}
					}

				}else{	$calendar_type = 'list';	}
														

			// set calendar shortcode values
				$SC = apply_filters('eventon_ajax_arguments',$SC, $_POST, $ajaxtype);		
				ksort($SC);
				extract($SC);

				EVO()->calendar->shortcode_args = $SC; // set arguments to the calendar object
					
			// GET calendar header month year values
				$calendar_month_title = get_eventon_cal_title_month($fixed_month, $fixed_year, $lang);
						
			// Calendar content		
				$content = EVO()->evo_generator->_generate_events();

			// RETURN VALUES
				echo json_encode( apply_filters('evo_ajax_query_returns', array(
					'status'=> 					$status,
					'json'=> 					$content['data'],	
					'html'=>					$content['html'],				
					'cal_month_title'=>			$calendar_month_title,
					'SC'=> 	$SC,
					'debug' => array(
						's' => date('y-m-d h:i:s', $focus_start_date_range),
						'e' => date('y-m-d h:i:s', $focus_end_date_range),
					),
					
				), 
				$SC, $content) );exit;
		}

	// AJAX Events data
		function ajax_events_data(){
			$SC = isset($_POST['shortcode']) ? $_POST['shortcode']: array();
			EVO()->calendar->shortcode_args = $SC;
		}

	// Now Calendar
		public function refresh_now_cal(){

			$calnow = new Evo_Calendar_Now();
			
			$defA = isset($_POST['defA']) ? $_POST['defA'] : array();

			$calnow->process_a( $defA );

			ob_start();
			$calnow->get_body( true );
			$html = ob_get_clean();

			echo json_encode(array(
				'status'=>'good',
				'html'=> $html,
			)); exit;
		}


	// Load single event content
	// @2.6.13
		function load_event_content(){

			if(!isset($_POST['eid'])) return false;
			if(!isset($_POST['nonce'])) return false;

			if(!wp_verify_nonce($_POST['nonce'], 'eventon_nonce')) {echo 'nonce failed'; exit;} // nonce verification

			$EVENT = new EVO_Event($_POST['eid']);
			echo json_encode(
				apply_filters('evo_single_event_content_data',array(), $EVENT)
			);exit;
		}

	// load single eventcard content
	// @ 2.9.2
		public function load_single_eventcard_content(){
			$event_id = (int) $_POST['event_id'];
			$ri = (int) $_POST['ri'];
			$lang = isset($_POST['lang'])? $_POST['lang']:'L1';

			$event_data = EVO()->calendar->get_single_event_data( $event_id, $lang, $ri, array(
				'show_exp_evc'=>'yes'
			));

			if($event_data && is_array($event_data)) $event_data = $event_data[0];

			echo json_encode(array(
				'status'=>'good',
				'html'=> $event_data['content']
			)); exit;
		}

	// OUTPUT: json headers
		private function json_headers() {		header( 'Content-Type: application/json; charset=utf-8' );	}

	// for event post repeat intervals 
	// @return converted unix time stamp on UTC timezone
		public function repeat_interval(){
			$date_format = $_POST['date_format'];
		}

	

	// ICS file generation for add to calendar buttons
		function eventon_ics_download(){
			$event_id = (int)($_GET['event_id']);
			$ri = isset($_GET['ri'])? (int)$_GET['ri']:0;

			$EVENT = new EVO_Event($event_id,'',$ri);
			$EVENT->get_event_post();
			
			// Location information
				$lDATA = $EVENT->get_location_data();

				$location = '';
				if($lDATA){
					if($lDATA['name']) $location_name = $lDATA['name'];
					if($lDATA['location_address']) $location_address = $lDATA['location_address'];
					$location = ($location_name? $location_name . ' ':'') . ($location_address?$location_address:'');
					$location = $this->esc_ical_text( stripslashes($location) );
				}

			// start and end time
				$dDATA = $EVENT->get_utc_adjusted_times();
				$start = $this->sanitize_unix( $dDATA['start'] );
				$end = $this->sanitize_unix( $dDATA['end'] );
			
			$name = $summary = $EVENT->get_title();

			// summary for ICS file			
			$content = (!empty($EVENT->content))? $EVENT->content:'';
			if(!empty($content)){
				$content = strip_tags($content);
				$content = str_replace(']]>', ']]&gt;', $content);
				$summary = wp_trim_words($content, 50, '[..]');
				//$summary = substr($content, 0, 500).' [..]';
			}			
							
			
			$uid = uniqid();
			//$description = $the_event->post_content;
			
			//ob_clean();
				
			$time = current_time('timestamp');
			$year = date('Y', $time);

			//$slug = strtolower(str_replace(array(' ', "'", '.'), array('_', '', ''), $name));
			$slug = $EVENT->post_name;
						
			header("Content-Type: text/Calendar; charset=utf-8");
			header("Content-Disposition: inline; filename={$slug}.ics");

			/*
				// DAY LIGHT SAVING
				echo "BEGIN:VTIMEZONE\r\n";
				echo "TZID:". get_option('timezone_string'). "\r\n";
				echo "LAST-MODIFIED:". $this->sanitize_unix( $time ) . "\r\n";
				echo "BEGIN:STANDARD\r\n";
				echo "DTSTART:".$year."1104T020000\r\n";
				echo "TZOFFSETFROM:-0400\r\n";
				echo "TZOFFSETTO:-0500\r\n";
				echo "TZNAME:EST\r\n";
				echo "END:STANDARD\r\n";
				echo "BEGIN:DAYLIGHT\r\n";
				echo "DTSTART:".$year."0311T020000\r\n";
				echo "TZOFFSETFROM:-0500\r\n";
				echo "TZOFFSETTO:-0400\r\n";
				echo "TZNAME:EDT\r\n";
				echo "END:DAYLIGHT\r\n";
				echo "END:VTIMEZONE\r\n";
			*/

			echo "BEGIN:VCALENDAR\r\n";
			echo "VERSION:2.0\r\n";
			echo "PRODID:-//eventon.com NONSGML v1.0//EN\n";
			//echo "METHOD:REQUEST\n"; // requied by Outlook
			echo "BEGIN:VEVENT\n";
			echo "UID:{$uid}\n"; // required by Outlok
			echo "DTSTAMP:".date_i18n('Ymd').'T'.date_i18n('His')."\n"; // required by Outlook
			//echo "DTSTART:{$start}\n"; 
			//echo "DTEND:{$end}\n";
			echo "DTSTART:". 	( strpos($start, 'T')===false? date_i18n('Ymd\THis',$start): $start)."\n";
			echo "DTEND:".		( strpos($start, 'T')===false? date_i18n('Ymd\THis',$end): $end)."\n";
			echo "LOCATION:{$location}\n";
			echo "SUMMARY:".html_entity_decode( $this->esc_ical_text($name))."\n";
			echo "DESCRIPTION: ".$this->esc_ical_text($summary)."\n";

			echo "URL:" . ($EVENT->is_virtual() ? $EVENT->virtual_url() : $EVENT->get_permalink() ) . "\n";


			echo "END:VEVENT\n";
			echo "END:VCALENDAR";
			exit;
		}
		// 8932480932T0302Z format
		function sanitize_unix($unix){
			$t = explode('Z', $unix);
			$u = explode('T', $t[0]);

			$a = (int)$u[0];
			$b = (int)$u[1];

			if(strlen($a)<6) $a = sprintf('%06d', $a);
			if(strlen($b)<6) $b = sprintf('%06d', $b);

			return $a.'T'. $b .'Z';
		}
		function esc_ical_text( $text='' ) {
			
		    $text = str_replace("\\", "", $text);
		    $text = str_replace("\r", "\r\n ", $text);
		    $text = str_replace("\n", "\r\n ", $text);
		    $text = str_replace(",", "\, ", $text);
		    $text = EVO()->calendar->helper->htmlspecialchars_decode($text);
		    return $text;
		}

	// download all event data as ICS
		function export_events_ics(){
			global $eventon;

			if(!wp_verify_nonce($_REQUEST['nonce'], 'eventon_download_events')) die('Nonce Security Failed.');

			$events = EVO()->calendar->get_all_event_data(array(
				'hide_past'=>'yes'
			));
			
			if(!empty($events)):
				$slug = 'eventon_events';
				header("Content-Type: text/Calendar; charset=utf-8");
				header("Content-Disposition: inline; filename={$slug}.ics");
				echo "BEGIN:VCALENDAR\n";
				echo "VERSION:2.0\n";
				echo "PRODID:-//eventon.com NONSGML v1.0//EN\n";
				echo "CALSCALE:GREGORIAN\n";
				echo "METHOD:PUBLISH\n";

				foreach($events as $event_id=>$event){
					$location = $summary = '';

					if(!empty($event['details'])){
						$summary = wp_trim_words($event['details'], 50, '[..]');
					}

					// location 
						$Locterms = wp_get_object_terms( $event_id, 'event_location' );
						$location_name = $locationAddress = '';
						if ( $Locterms && ! is_wp_error( $Locterms ) ){
							$location_name = $Locterms[0]->name;
							$termMeta = evo_get_term_meta('event_location',$Locterms[0]->term_id, '', true);
							$locationAddress = !empty($termMeta['location_address'])? 
								$termMeta['location_address']:
								(!empty($event['location_address'])? $event['location_address']:'');
						}
						$location = (!empty($location_name)? $location_name:'').' '. (!empty($locationAddress)? $locationAddress:'');

					$uid = uniqid();
					echo "BEGIN:VEVENT\n";
					echo "UID:{$uid}\n"; // required by Outlok
					echo "DTSTAMP:".date_i18n('Ymd').'T'.date_i18n('His')."\n"; // required by Outlook
					echo "DTSTART:" . evo_get_adjusted_utc($event['start']) ."\n"; 
					echo "DTEND:" . evo_get_adjusted_utc($event['end']) ."\n";
					if(!empty($location)) echo "LOCATION:". $this->esc_ical_text($location) ."\n";
					echo "SUMMARY:". EVO()->calendar->helper->htmlspecialchars_decode($event['name'])."\n";
					if(!empty($summary)) echo "DESCRIPTION: ".$this->esc_ical_text($summary)."\n";
					echo "END:VEVENT\n";

					// repeating instances
						if(!empty($event['repeats']) && is_array($event['repeats'])){
							foreach( $event['repeats'] as $interval=>$repeats){
								if($interval==0) continue;

								$uid = uniqid();
								echo "BEGIN:VEVENT\n";
								echo "UID:{$uid}\n"; // required by Outlok
								echo "DTSTAMP:".date_i18n('Ymd').'T'.date_i18n('His')."\n"; // required by Outlook
								echo "DTSTART:" . evo_get_adjusted_utc($repeats[0]) ."\n"; 
								echo "DTEND:" . evo_get_adjusted_utc($repeats[1]) ."\n";
								if(!empty($location)) echo "LOCATION:". $this->esc_ical_text($location) ."\n";
								echo "SUMMARY:". EVO()->calendar->helper->htmlspecialchars_decode($event['name'])."\n";
								if(!empty($summary)) echo "DESCRIPTION: ".$this->esc_ical_text($summary)."\n";
								echo "END:VEVENT\n";
							}
						}

				}
				echo "END:VCALENDAR";
				exit;

			endif;
		}

	// get event time based on local time on browswr
		function get_local_event_time(){
			$datetime = new evo_datetime();
			$offset = $datetime->get_UTC_offset();
			$brosweroffset = (int)$_POST['browser_offset'] *60;
			echo $brosweroffset.' '.$offset.' '.$object->evvals['evcal_srow'][0];

			$newunix = $object->evvals['evcal_srow'][0] + ($offset + $brosweroffset);
			echo date('Y-m-d h:ia', $newunix);
		}


	// Search results for ajax search of events from search box
	function search_evo_events(){
		$searchfor = $_POST['search'];
		$shortcode = $_POST['shortcode'];

		// if search all events regardless of date
		if( !empty($shortcode['search_all'] ) && $shortcode['search_all']=='yes'){
			$DD = EVO()->calendar->DD;
			$DD->modify('first day of this month'); $DD->setTime(0,0,0);
			$DD->modify('-15 years');
			$__focus_start_date_range = $DD->format('U');
			$DD->modify('+30 years');
			$__focus_end_date_range = $DD->format('U');
		}else{
			$current_timestamp = current_time('timestamp');

			// restrained time unix
				$number_of_months = !empty($shortcode['number_of_months'])? $shortcode['number_of_months']:12;
				$month_dif = '+';
				$unix_dif = strtotime($month_dif.($number_of_months-1).' months', $current_timestamp);

				$restrain_monthN = ($number_of_months>0)?				
					date('n',  $unix_dif):
					date('n',$current_timestamp);

				$restrain_year = ($number_of_months>0)?				
					date('Y', $unix_dif):
					date('Y',$current_timestamp);			

			// upcoming events list 
				$restrain_day = date('t', mktime(0, 0, 0, $restrain_monthN+1, 0, $restrain_year));
				$__focus_start_date_range = $current_timestamp;
				$__focus_end_date_range =  mktime(23,59,59,($restrain_monthN),$restrain_day, ($restrain_year));
		}
		

		// Add extra arguments to shortcode arguments			
			$new_arguments = array(
				'focus_start_date_range'=>$__focus_start_date_range,
				'focus_end_date_range'=>$__focus_end_date_range,
				's'=>$searchfor,
				'search_all'=> (isset($shortcode['search_all'])? $shortcode['search_all']:'no')
			);

			$args = (!empty($args) && is_array($args))? 
				wp_parse_args($new_arguments, $args): $new_arguments;

			// merge passed shortcode values
				if(!empty($shortcode))
					$args= wp_parse_args($shortcode, $args);

			EVO()->calendar->process_arguments($args);

			$content = EVO()->calendar->get_calendar_header(
				array(
					'date_header'=>false,
					'sortbar'=>false,
					'range_start'=>$__focus_start_date_range,
					'range_end'=>$__focus_end_date_range,
					'header_title'=>'',
					'send_unix'=>true
				)
			);

			$content .= EVO()->calendar->_generate_events('html');
			
			$content .= EVO()->calendar->body->get_calendar_footer();
			
			echo json_encode(array(
				'content'=>$content,
				'range'=> date('Y-m-d', $__focus_start_date_range).' '.date('Y-m-d', $__focus_end_date_range)
			));
			exit;

	}
	/* dynamic styles */
		/*function eventon_dymanic_css(){
			//global $foodpress_menus;
			require('admin/inline-styles.php');
			exit;
		}*/

}