AppStateESS/homestead

<?php

namespace Homestead;

use \Homestead\Exception\StudentNotFoundException;

abstract class RoommatePairingStrategy {

    protected $term;

    public function __construct($term)
    {
        $this->term = $term;
    }

    public abstract function doPairing(&$applications, &$pairs);

    protected function pairAllowed($requestor, $requestee)
    {
        return $requestor->gender == $requestee->gender;
    }

    protected function createPairing(HousingApplication $a, HousingApplication $b)
    {
        // Determine lifestyle option
        $option = LO_COED;
        if($a->lifestyle_option == LO_SINGLE_GENDER || $b->lifestyle_option == LO_SINGLE_GENDER) {
            $option = LO_SINGLE_GENDER;
        }

        try{
            $studentA = StudentFactory::getStudentByUsername($a->username, $this->term);
        }catch(StudentNotFoundException $e){
            echo('StudentNotFoundException: ' . $a->username . ' Could not pair ' . $a->username . ', ' . $b->username . "\n");
            return null;
        }

        try{
            $studentB = Studentfactory::getStudentByUsername($b->username, $this->term);
        }catch(StudentNotFoundException $e){
            echo 'StudentNotFoundException: ' . $b->username . ' Could not pair ' . $a->username . ', ' . $b->username . "\n";
            return null;
        }

        if($a->getCreatedOn() < $b->getCreatedOn()){
            $earliestTime = $a->getCreatedOn();
        }else{
            $earliestTime = $b->getCreatedOn();
        }

        // Looks like there is no problem here.
        return new AssignmentPairing($studentA, $studentB, $option, $earliestTime);
    }
}