<?php /////////
//	OneNOAA Calendar Feed
//	AS of Nov 17, 2014, Google calendars updated their API to produce the calendar contents as a JSON file, not XML
//	We are rewriting this parser app on 11/18/2014 to use the new format. Requirements:
// 	* A google API key that let's your webserver run the cron job to use curl to copy the calendar file contents.
//		for STAR, this is: AIzaSyDCLNOoGAOGy3BjGAvmaG68_CXXWAAoU8M
// 		The key above was updated 10/9/2015 and the only place it lives is in the file: 
//		/data/home001/lbrown/STAR_seminar_download_all_json.sh
// 	*	Using the URL of the calendar data and today's date and the calendar's id string, build the url of the JSON file
// 	*	Set up a cron job to curl and validate the JSON file, and save it to a location on your webserver
//  	that will let you parse it and render it to whatever web page you like.
//  	We retrieve the next 99 seminars, today and going forward. You can download up to 250 events, per google's spec for the new API
//  	The STARJSONValidator.php sends e-mails to the webmaster when the JSON file is invalid or has error data in it, 
//  	The script does not overwrite the local copy of the JSON file if errors are detected in the latest file update,
// 		This protects a readable and slightly out of date version of the 
//  	calendar listing from being overwritten by garbage when the Google calendar is down or when there's 
//  	something wrong with your API key, whatever.
//  	ID string for the Google NOAA Seminars calendar: noaa.gov_49443234363332@resource.calendar.google.com
//		ID string for the Google STAR seminars calendar: noaa.gov_hvn8pjdu449t75uosgrahqb1u4@group.calendar.google.com
//  	The OneNOAA Seminars URL that returns the list of future seminars,
//  	https://www.googleapis.com/calendar/v3/calendars/noaa.gov_49443234363332@resource.calendar.google.com/events?maxResults=99&timeMin=2014-11-18T05:00:00-05:00&orderBy=startTime&singleEvents=true&key=AIzaSyAEzeSz9ddGEf3q_ULOHZDd5Ed-zwF4pgo

//		5/2/2018 - updated API key from NOAA download seminars script: AIzaSyDCLNOoGAOGy3BjGAvmaG68_CXXWAAoU8M
//		NEW URL for STAR Calendar:
//		https://www.googleapis.com/calendar/v3/calendars/noaa.gov_hvn8pjdu449t75uosgrahqb1u4@group.calendar.google.com/events?maxResults=99&timeMin=2018-05-02T05:00:00-05:00&orderBy=startTime&singleEvents=true&key=AIzaSyDCLNOoGAOGy3BjGAvmaG68_CXXWAAoU8M

//    where in this string, 'timeMin=2014-11-18T05:00:00-05:00' should be replaced with the current date, is:
//    If the cron job has stopped, or you need an instantaneous refresh of the calendar listing information:
//		FORCE A MANUAL UPDATE OF THE SEMINARS FEED - LKB 12/2/2014
//		log onto webserver via putty and run this shell script:
// 		~/STAR_seminar_download_all_json.sh 
// 		after this, the source json file should be downloaded, verified as 'good', and copied to the correct folder in the webserver.
//		the new local webserver download copy of the JSON file of the seminars is always located at:
//		/www/star/CalFeed/STARSeminarsFeed_99_goodFile.json
//		to use the json file on the webpage, we decode it to a PHP associative array and then parse as usual, with a few extra cleanup steps.

// $json = '/www/star/CalFeed/STARSeminarsFeed_99_goodFile.json';  // this is the PHP style path to the JSON file
// $json_contents = file_get_contents('CalFeed/STARSeminarsFeed_99_goodFile.json');  // this is the HTML path to the JSON file
// $tmsrc = 'noaa.gov_hvn8pjdu449t75uosgrahqb1u4%40group.calendar.google.com'  -- this is the value for the new STAR only calendar; 
			// this is a string specific to the particular calendar from which events are being catalogued. 
// $listType = 'future' or 'past' event list

function CalendarMaker($json,$json_contents,$tmsrc,$listType,$pastYr) {
$calArray = json_decode($json_contents,true); // true gives an associative array;
// function used mainly on $descr as a character cleanup function: can add other characters as needed to this cleanup list.
// this function swaps out unneeded html tags from Google and stupid characters from MS Word for something that renders properly in this page

function print_r3($val){
    echo "<pre>";
    print_r($val);
    echo  '</pre>';
}
// print_r3($calArray);

function convertSmartQuotes($string) {
$search = array(chr(145),
	chr(146),
	'’',
	'`',
	chr(147),
	chr(148),
	chr(151),
	chr(160),
	'<span>',
	'</span>',
	'<br>Speaker:',
	'<br>Remote Access:',
	'<br>Abstract:',
	'<br>About the Speaker:',
	'<br>Sponsor:');

$replace = array("'",
	"'",
	"'",
	"'",
	'"',
	'"',
	'-',
	' ',
	'',
	'',
	'<br><strong>Speaker:</strong> ',
	'<br><strong>Remote Access:</strong> ',
	'<br><strong>Abstract:</strong> ',
	'<br><strong>About The Speaker:</strong> ',
	'<br><strong>Sponsor:</strong> ');

return str_replace($search, $replace, $string);
}

// This list is coded in a table w/ inline styles because it permits the page contents to
// be copied and pasted into an e-mail for broadcast to subscribers w/ no loss of layout fidelity
// style th & td swapped in for variables to make the code more readable and editable:

	$styledTH = "	<tr>\n		<th style='text-align: right; color: #93052A; font-weight: normal; padding: 5px; width: 7em; font-size: 1.1em !important;'>";
	$styledTD = "		<td style='padding: 5px; color: #666 !important; vertical-align: middle !important;'>";
	$dateH3 = "<h3 style='color: navy; font-size: 1.25em; margin-top: 1.4em; padding-left: .5em;'>";
	$renderBlob = "";  // this is only the current 'blob';
	$renderBlobFuture = "";
	$renderBlobPast = "";
	$prevEvDate = "";
	$nowDateObj = new DateTime();
	
foreach($calArray['items'] as $elements) {
	// updated 3/16/2016
	// this 'if' catches the condition when users (accidentally?) set the visibility of seminars to 'private', 
	// we don't render events that are set to private;
	// we render cal events when visibility is (a) NOT set, and (b) visibility 'is explicitly set to public
	if (((!isset($elements["visibility"])) || ($elements["visibility"] == "public")) && isset($elements['summary']) && ($elements['summary'] !== "")) {
		new DateTime($elements["start"]["dateTime"]);
		$curDateObj = new DateTime($elements["start"]["dateTime"]);  
		$curDate = date_format($curDateObj,"F j, Y");

		if ($prevEvDate == "") { 
			$renderBlob .= $dateH3 . $curDate . "</h3>\n"; 
		}
		if (($prevEvDate !== "") && ($curDate !== $prevEvDate)) { 
			$renderBlob .= $dateH3 . $curDate . "</h3>\n"; 
		}
		$ExpandLinkID = "Exp" . rand(10000,49999);
		$ExpandDescrID  = $ExpandLinkID . "a";
		$eventTop = "Top" . $ExpandLinkID;
		$renderBlob .= "<a id='" . $eventTop . "'></a>\n<table style='margin: 8px 2px 2px 2px; line-height: 140%; padding-top: 8px; border-top: navy 1px dotted; width: 100%;'>\n";
		$renderBlob .= 	$styledTH . "<strong>Title:</strong></th>\n";

		// 2016-05-24: adding 'new' indicator to the title field
		// $elements['created'] gives the date the seminar entry was created in the format:
		// "2014-11-22T13:10:20.000Z"
		// Take the first 10 chars of this field and get PHP to see it as a date, 
		// then test to see if the date is < 1 week ago, and print 'New' if it is less than 1 week ago 

		$creationDateString = substr($elements['created'],5,2)."/".substr($elements['created'],8,2)."/".substr($elements['created'],0,4);
		$creationDate = (date_create($creationDateString));
		$creationDateFormatted = date("m-d-Y", (strtotime($creationDateString)));
		$today = date_create();
		$daysAgo = date_diff($today,$creationDate);
		if (($daysAgo->days) < 8) {
			$newString = "<div style='color: #93052A; font-weight: bold; font-size: 16px; float: left; height: 1em; padding: 0.3em 0.5em 0 0;'>New</div>";
		}
		else {
			$newString = "";
		}
		$renderBlob .= $styledTD . $newString;
		
		// if 'future', show link to calendar entry
		if ($listType == 'future') {
			$renderBlob .= "<strong><a target='_blank' title='click to add this seminar to your calendar' \n";
			$renderBlob .= "class='NoImage' href='".$elements['htmlLink']."'>" . $elements['summary'] . "</a></strong>";
		}

		// if 'past', no link to calendar, just the event title
		if ($listType == 'past') {
			$renderBlob .= "<strong>" . $elements['summary'] . "</strong>";
		}
		$renderBlob .= "</td>\n	</tr>\n";
		
		// extract the presenter's name and affiliation from the end of the description field, enclosed in {} 				
		if (isset($elements['description']) && ($elements['description'] !== "")) {  // if there is content in the description
			$descr = $elements['description'];			
		}
		
		if (!isset($elements['description']) || ($elements['description'] == "")) { // if no content in description
			$descr = "No description has been supplied for this seminar. Check back soon for complete details.";
		}
		
		$descr = convertSmartQuotes($descr);  // remove unneeded html tags and bad characters
				
		$renderBlob .= $styledTH . "<strong>Presenter(s):</strong></th>\n";
		// there is no data field in the Google calendar for seminar presenter
		// we create such a field for our calendar listing by doing the following:
		// at the end of the description field, we ask everyone who creates a seminar listing
		// UPDATE: 5/4/2018
		// to add, in a separate line, enclosed by CURLY BRACES, the name and affiliation of the presenter(s)
		// so the presenter name looks like: {Dr. Marian Smith, University of Akron, Department of Oceanography}
		// so when we want to render that presenter info into this listing, the next line of code extracts the content between the curly braces
		// have to keep the parenthetical option for backward compatibility

		$lastChars = substr($descr,-20);
		$descrLngth = strlen($descr);
		// echo $lastChars;

		if (stripos($lastChars,'}')) {   // if using {} for presenter block at bottom
			$PresStart = strripos($descr,'{');
			$PresEnd = strripos($descr,'}');
			$presenterString = (substr($descr, $PresStart+1, ($PresEnd - $PresStart - 1)));
			$descr_minusPresenter = substr($descr, 0, $PresStart-1);
		}

		else if (stripos($lastChars,')')) { // using parens
			$PresStart = strripos($descr,'(');
			$PresEnd = strripos($descr,')');
			$presenterString = (substr($descr, $PresStart+1, ($PresEnd - $PresStart - 1)));
			$descr_minusPresenter = substr($descr, 0, $PresStart-1);
		}
		else {
			$presenterString = "TBD";
			$descr_minusPresenter = $descr;
		}	

		$renderBlob .= $styledTD . $presenterString ."</td>\n	</tr>\n";
		$startTime=new DateTime($elements["start"]["dateTime"]);
		$startTimeFormatted = date_format($startTime,'g:i a');
		$endTime = new DateTime($elements["end"]["dateTime"]);
		$endTimeFormatted = date_format($endTime,'g:i a');
		$renderBlob .= $styledTH . "<strong>Date &amp; Time:</strong></th>\n" . $styledTD . $curDate . "\n";
		$renderBlob .= "<br>" . $startTimeFormatted ." - " . $endTimeFormatted ." <span title='All seminar times are given in Eastern Time'>ET</span></td>\n	</tr>\n";

		if (isset($elements['location'])) {
			$location = $elements['location'];
		} else {
			$location = 'TBD';
		}
		$renderBlob .= $styledTH . "<strong>Location:</strong></th>\n" . $styledTD . $location . "</td>\n	</tr>\n";
		$tmeid = substr($elements['htmlLink'],(strpos($elements['htmlLink'],'=')+1)); // $tmeid is a Google event identifier that we use to build the URL

		// when the description field is rendered onto the page,
		// we remove the presenter name from the end, to reduce redundancy
		// the description is rendered into a div that is initially not visible but expanded by clicking the link that says 'Expand'.

		$renderBlob .= $styledTH . "<strong>Description:</strong></th>\n";
		$renderBlob .= $styledTD . "<h3 style='width: 100px; margin-bottom: 3px;'><a title='click to expand description' class='collapsedDescr' \n";
		$renderBlob .= "href='#" .$eventTop ."' id='". $ExpandLinkID ."' OnClick='expandomaticAP_Icons(\"" . $ExpandDescrID. "\",\"" .$ExpandLinkID."\",\"Contract\",\"Expand\");'>Expand</a></h3>\n"; 
		$renderBlob .= "		<div id='". $ExpandDescrID ."' class='acroContainer'>\n";
		$renderBlob .= "		<div style='padding: 10px; border: 1px #CACCCA solid; border-radius: 8px; font-family: arial, sans-serif, helvetica;'>\n";
		$renderBlob .= $descr_minusPresenter ."</div></div></td>\n	</tr>\n";
		// only rendering the 'add to calendar' button for FUTURE events, not PAST
		$todayVal = date_timestamp_get($today);
		$startTimeVal = date_timestamp_get($startTime);
		// if ($todayVal < $startTimeVal) {  // if the event in question is in the FUTURE
		if ($listType == 'future') {
			$renderBlob .= $styledTH . "<strong>Add seminar:</strong></th>\n";
			$renderBlob .= $styledTD . "<a href='https://www.google.com/calendar/event?action=TEMPLATE&amp;tmeid=" . $tmeid . "&amp;tmsrc=" . $tmsrc . "' target='_blank'><img \n";
			$renderBlob .= "src='images/gc_button1_en.gif' \n		alt='add to Google calendar button' title='Add this event to your Google calendar' style='margin-top: 2px;'></a></td>\n	</tr>\n";
		}
		$renderBlob .= "</table>\n";
		// setting prevEvDate to curDate at the end of the 'loop' compares the next seminar's date to the current one's date
		// and when they are different, we display the date header w/ a changed current date.
		$prevEvDate = $curDate;

			if ($curDateObj >= $nowDateObj) {  // if this is a future event
					$renderBlobFuture .= $renderBlob;
			}

			else {  // if this is a past event
					$renderBlobPast .= $renderBlob;
			}
		
		$renderBlob = "";  // reset var to start over with the next event

		}  // end of 'if' for catching events set to private and not displaying them. - 10/2/2015
	}

	// future list type, has content
	if (($listType=='future') && (strlen($renderBlobFuture) > 10)) {
		echo $renderBlobFuture;
	}

	// past list type, has content
	if (($listType=='past') && (strlen($renderBlobPast) > 10)) {
		echo $renderBlobPast;
	}	
	
	// future list type, no content
	if (($listType=='future') && (strlen($renderBlobFuture) < 10)) {
		echo "<br>Please check back later for new seminars.<br>&nbsp;";
	}

	// past list type, no content
	if (($listType=='past') && (strlen($renderBlobPast) < 10)) {
		echo "<br>No past seminars for this period to display.<br>&nbsp;";
	}

} // end of function bracket
?>