booking/booking.studygroup_leaders.inc

<?php

/**
 * @file
 * Functions for calculating leaders and helpers for discussion groups
 */


	
/**
 * Function for calculating and assigning leaders and helpers to active study group sessions
 */
function booking_studygroups_leaders_calculate() {
	global $event;
	
	$calculation_messages = array();
	
	//get a randomly ordered list of people to work with
	$people = _booking_shuffle_assoc(_booking_studygroups_retrieve_eligible_people());
	
	//get details of the study groups
	$groups = _booking_studygroups_retrieve_groups();
	
	//loop through the list of people
	foreach ($people as $person)
	{
		$age = _booking_get_age_years($person->booking_dob);	
		$calculation_messages[] = t('Processing eligible Leader/helper with id !id and age !age', 
			array('!id' => $person->nid, '!age' => $age)
		);

		//if someone is 22 or over, they're a leader
		if ($age >= 22)
		{
			$next_group_index = $groups[_booking_get_next_studygroup('leader_nid', $groups)];
			$calculation_messages[] = t('Assigning id !id to study group !group as a leader', 
				array('!id' => $person->nid, '!group' => $next_group_index)
			);			
			$groups[$next_group_index]->leader_nid = $person->nid;
		}
		//if someone is under 22, they're a helper

		//left over people become a reserve leader
	}
	
	watchdog('booking', "<pre>Study Group Leader/Helper calculation\n" . implode("\n", $calculation_messages) . "</pre>");	
	
	//input the data to the database
}

function _booking_get_next_studygroup($type, $studygroups) {
	
	$count = count($studygroups) - 1;
	
	for ($i = 0; $i < $count; $i++) 
	{
		$group = $studygroups[$i];
		$leader = $group->leader_nid;
		//watchdog('booking_debug', "<pre>Study Group Element at index $i:\n@info</pre>", array('@info' => print_r( $group, true)));		
		//watchdog('booking_debug', "<pre>Study Group Leader NID at index $i:\n@info</pre>", array('@info' => var_dump($group)));	
		
		if ($leader == 0)
		{
			return $i;
		}
		
	}
	
}

/**
 * Function for 
 */
function _booking_studygroups_retrieve_eligible_people() {
	global $event;
	
	$attendees = array();
	
	//select males that are booked in
	$query = db_select('booking_person', 'p');
	$db_and = db_and();
	$db_and->condition('p.booking_event_id', $event->eid, '=');
	$db_and->condition('p.booking_gender', 'M', '=');
	$db_and->condition('p.booking_status', 1, '=');
	$query->condition($db_and);
	$query->fields('p');
	$bookedin_result = $query->execute();					
	
	//iterate over the attendee associative array and add some fields	
	foreach ($bookedin_result as $person)
	{
		
		$person->processed = 0;
		$person->leading = array();
		$person->helping = array();
		$person->reserve_leading = array();
		$attendees[] = $person;
	}	
	
	//select males that are on the waiting list up to position number 100
	$result2 = db_query('SELECT DISTINCT nid, booking_firstname, booking_lastname, booking_state, booking_readinggroup, booking_country, booking_status, booking_dob, booking_gender
	                    FROM (
	                      SELECT p.nid, p.booking_firstname, p.booking_lastname, p.booking_state, p.booking_country, p.booking_readinggroup, pay.booking_payment_date, p.booking_status, p.booking_gender, p.booking_dob
	                      FROM {booking_person} p, {booking_payment} pay
					      				WHERE booking_event_id = :eid and p.nid = pay.booking_person_nid and ( booking_status = 2 or booking_status = 4)
												LIMIT 100
	                    ) AS booking
								WHERE booking_gender = \'M\'
	              ORDER BY booking_status, booking_payment_date',
						array(':eid' => $event->eid));			
	
	//iterate over the attendee associative array and add some fields	
	foreach ($result2 as $person)
	{
		
		$person->processed = 0;
		$person->leading = array();
		$person->helping = array();
		$person->reserve_leading = array();
		$attendees[] = $person;
	}		
	
	//watchdog('booking', "<pre>Eligible Leaders/Helpers List:\n@info</pre>", array('@info' => print_r( $attendees, true)));
	
	return $attendees;
	
}



/**
 * Function for 
 */
function _booking_studygroups_retrieve_groups() {
	global $event;
	
	$groups = array();
		
	//select all the study groups for this event id
	$studygroup = db_query("SELECT * FROM {booking_studygroup_list} WHERE booking_eventid = :eid", array(':eid' => $event->eid));
	$group_mapping = $studygroup->fetchAllAssoc('sid');		
	
	//select the number of study group sessions
	//assume they all have the same number of sessions
	//$num_sessions = $studygroup->booking_num_group_sessions;
	
	foreach ($group_mapping as $group)
	{
		//watchdog('booking_debug', "<pre>Study Group Element:\n@info</pre>", array('@info' => print_r( $group, true)));		
		for ($i = 1; $i <= 16; $i++)
		{
			$new_group = clone $group;
			
			$new_group->session_id = $i;
			$new_group->leader_nid = -1;
			$new_group->helper_nid = 0;
			$new_group->reserve_nid = 0;
			$new_group->processed = 0;
			
			$groups[] = $new_group;
		}
	}
	
	watchdog('booking', "<pre>Study Group Sessions:\n@info</pre>", array('@info' => print_r( $groups, true)));
	return $groups;
	
}