//get CampusCE courses by category ID

public static function cecf_get_courses_by_category_id( $category_id ) {

$data_url = sprintf( CE_Plugin_Settings::get_data_url() . '?CategoryID=%s', esc_attr( $category_id ) );

$data = CE_Custom_Functions::cecf_call_data_url( $data_url );

//loop through all returned classes to extract unique courses

$already_processed = array(); //keep track of courses already processed

$courses = array(); //keep track of courses to return

$classes = $data->Class; //get only class data

if ( ! empty( $classes ) ) {

foreach ( $classes as $class ) {

if ( ! in_array( $class->CourseID, $already_processed ) ) {

//not already processed, so create course object with relevant data and add to courses array

$obj = new StdClass();

$obj->CourseID = (string) $class->CourseID;

$obj->Title = trim( (string) $class->Title);

$obj->WebDescr = trim( (string) $class->WebDescr);

$obj->CategoryID = (string) $class->CategoryID;

$obj->NewTag = (string) $class->NewTag;

$courses[] = $obj;

$already_processed[] = ( string ) $class->CourseID; //add courseID to list of processed courses

//var_dump($obj);

}

}

}

//var_dump($courses);

return $courses;

}

//get CampusCE classes by category ID

public static function cecf_get_classes_by_category_id( $category_id ) {

$data_url = sprintf( CE_Plugin_Settings::get_data_url() . '?CategoryID=%s', esc_attr( $category_id ) );

$classes = CE_Custom_Functions::cecf_call_data_url( $data_url );

//var_dump($classes);

return $classes->Class;

}

//get CampusCE category by ID

public static function cecf_get_category_by_id( $category_id ) {

$data_url = sprintf( CE_Plugin_Settings::get_data_url() . '?CategoryID=%s', esc_attr( $category_id ) );

$courses = CE_Custom_Functions::cecf_call_data_url($data_url);

$category = null;

if ( isset( $courses->Category ) ) {

$category = $courses->Category;

}

//var_dump($category);

return $category;

}

/** REMOVING for now as this call doesn't return the data as expected **/

//get single CampusCE course by ID

/*public static function cecf_get_course_by_id($course_id) {

$data_url = sprintf(CE_Plugin_Settings::get_data_url() . "?CourseID=%s", esc_attr($course_id));

$course = CE_Custom_Functions::cecf_call_data_url($data_url);

//var_dump($course);

return $course;

}*/

//call data source to return information

private static function cecf_call_data_url( $data_url ){

$user_key = base64_encode( CE_Plugin_Settings::get_user_key() ); //encode user key

$output = null;

try {

//use cURL to contact server and get response with data

$ch = curl_init( $data_url );

curl_setopt( $ch, CURLOPT_HTTPHEADER, array ( 'UserKey:' . $user_key ) );

curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );

$output = curl_exec( $ch );

$output1 = curl_close( $ch );

$output = simplexml_load_string( $output );

} catch ( Exception $e ) {

trigger_error( 'Unable to retrieve information from data source.' );

}

return $output;

}

/*

* cecf_rest_course_info() is a callback function passed into a registered route

* to send class data via REST

* @param WP_REST_Request $request The request object being served from the registered route

* @return WP_REST_Response $data in JSON, an array of courses and the corresponding category

*/

public static function cecf_rest_course_info( WP_REST_Request $request) {

$parameters = $request->get_url_params(); //get the URL parameters from the request

$rest_url_category_ID = $parameters['id']; //get only the ID passed into URL parameters from the registered route

//Verify ID format (4 numeric chars)

if ( preg_match( '/^(\d{4})$/', $rest_url_category_ID ) ) {

// Retrieve data from CampusCE

$courses = CE_Custom_Functions::cecf_get_courses_by_category_id( $rest_url_category_ID );

$category = CE_Custom_Functions::cecf_get_category_by_id( $rest_url_category_ID );

// If there are courses

if ( ! empty( $courses ) ) {

// Truncate Description

foreach ( $courses as $class ) {

if ( false == empty( $class->CourseID ) ) {

//Load title and desc in to variables, and force tags to be balanced

$class_title = balanceTags( $class->Title, true );

$class->Title = $class_title;

$class_desc = balanceTags( wp_trim_words( $class->WebDescr, 40, '...' ), true );

$class->WebDescr = $class_desc;

}

}

// Build data array from course and category arrays

$data = array(

'courses' => (array) $courses,

'category' => (array) $category,

);

//send the data as a JSON response

return new WP_Rest_Response($data, 200);

} else {

// Message if there are no classes

echo '<p>Courses have begun. Please check back for future offerings.</p><p>Also, check out our <a href="http://www.campusce.net/BC/category/category.aspx">online catalog</a> for other offerings.</p>';

}

} else {

// Return error if ID format is incorrect

echo '<p>Error: Incorrect CampusCE ID Format</p>';

}

// Don't print any extra information

die();

}