Distribution.php 40.2 KB
Newer Older
1 2 3
<?php
/**
 * @file
4
 * Contains \Drupal\query_example\Controller\QueryExampleController
5 6 7 8 9 10 11 12 13 14 15
 */

namespace Drupal\epal\Controller;

use Drupal\Core\Entity\Query\QueryFactory;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\HttpFoundation\JsonResponse;
use Drupal\Core\Controller\ControllerBase;

use Symfony\Component\HttpFoundation\RedirectResponse;
16
use Drupal\Core\Database\Database;
17 18 19 20 21
use Drupal\Core\Database\Connection;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Drupal\Core\Logger\LoggerChannelFactoryInterface;

22 23 24 25 26
//use Drupal\Core\Datetime\DrupalDateTime;
use Drupal\Core\TypedData\Plugin\DataType\TimeStamp;

use Drupal\Core\Language\LanguageManagerInterface;

27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61
class Distribution extends ControllerBase
{

    const SUCCESS = 0;
    const ERROR_DB = -1;
    const NO_CLASS_LIMIT_DOWN = -2;
    const SMALL_CLASS = 1;
    const NON_SMALL_CLASS = 2;

    protected $entity_query;
    protected $entityTypeManager;
    protected $logger;
    protected $connection;
    protected $language;
    protected $currentuser;

    protected $pendingStudents = array();
    protected $choice_id = 1;
    protected $globalCounterId = 1;

    public function __construct(
        EntityTypeManagerInterface $entityTypeManager,
        QueryFactory $entity_query,
        Connection $connection,
        LoggerChannelFactoryInterface $loggerChannel
    ) {
		$this->entityTypeManager = $entityTypeManager;
		$this->entity_query = $entity_query;
		$connection = Database::getConnection();
		$this->connection = $connection;
		$language =  \Drupal::languageManager()->getCurrentLanguage()->getId();
		$this->language = $language;
		$currentuser = \Drupal::currentUser()->id();
		$this->currentuser = $currentuser;
		$this->logger = $loggerChannel->get('epal');
62 63
    }

64
    public static function create(ContainerInterface $container)
65 66 67 68 69 70
    {
        return new static(
          $container->get('entity_type.manager'),
          $container->get('entity.query'),
          $container->get('database'),
          $container->get('logger.factory')
71
        );
72 73
    }

74 75
    public function createDistribution(Request $request)
    {
76

77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
        $numDistributions = 3;
        $sizeOfBlock = 1000000;

        // POST method is checked
        if (!$request->isMethod('POST')) {
            return $this->respondWithStatus([
                "message" => t("Method Not Allowed")
            ], Response::HTTP_METHOD_NOT_ALLOWED);
        }

        // user validation
        $authToken = $request->headers->get('PHP_AUTH_USER');
        $users = $this->entityTypeManager->getStorage('user')->loadByProperties(array('name' => $authToken));
        $user = reset($users);
        if (!$user) {
            return $this->respondWithStatus([
                'message' => t("User not found"),
            ], Response::HTTP_FORBIDDEN);
        }

        // user role validation
        if (false === in_array('ministry', $user->getRoles())) {
            return $this->respondWithStatus([
                'message' => t("User Invalid Role"),
            ], Response::HTTP_FORBIDDEN);
        }

        // check where distribution can be done now ($capacityDisabled / $directorViewDisabled settings)
        $config_storage = $this->entityTypeManager->getStorage('epal_config');
        $epalConfigs = $config_storage->loadByProperties(array('id' => 1));
        $epalConfig = reset($epalConfigs);
        if (!$epalConfig) {
             return $this->respondWithStatus([
                'message' => t("EpalConfig Enity not found"),
             ], Response::HTTP_FORBIDDEN);
        } else {
            $capacityDisabled = $epalConfig->lock_school_capacity->getString();
            $directorViewDisabled = $epalConfig->lock_school_students_view->getString();
            $applicantsResultsDisabled = $epalConfig->lock_results->getString();
            if ($capacityDisabled !== "1" || $directorViewDisabled !== "1" || $applicantsResultsDisabled !== "1") {
                return $this->respondWithStatus([
                    'message' => t("capacityDisabled and / or directorViewDisabled settings are false"),
                ], Response::HTTP_FORBIDDEN);
            }
        }

        $transaction = $this->connection->startTransaction();

        try {
            // initialize/empty epal_student_class if there are already data in it!
            if ($this->initializeResults() === self::ERROR_DB) {
	            $transaction->rollback();
                return $this->respondWithStatus([
                    "message" => t("Unexpected Error in initializeResults function")
                ], Response::HTTP_INTERNAL_SERVER_ERROR);
            }
            if (($limitUp_class = $this->retrieveCapacityLimitUp("1")) === self::ERROR_DB) {
	            $transaction->rollback();
                return $this->respondWithStatus([
                    "message" => t("Unexpected Error in retrieveCapacityLimitUp function")
                ], Response::HTTP_INTERNAL_SERVER_ERROR);
            }
            // print_r("<br> ΑΝΩΤΑΤΟ ΟΡΙΟ ΜΑΘΗΤΩΝ: " . $limitUp_class);

            while ($this->choice_id <= $numDistributions) {

                if ($this->choice_id === 1) {
144
					// υπολογισμός πλήθους για να καθοριστεί ο αριθμός των fetches που θα κάνουμε με συγκεκριμένο sizeOfBlock
145 146 147 148
					$sCon = $this->connection->select('epal_student', 'eStudent')
						->fields('eStudent', array('id'));
					$numData = $sCon->countQuery()->execute()->fetchField();
					//print_r("<br>numData: " .  $numData);
149

150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
	                $num = 1;
					$j = 1;
                    while ($num <= $numData) {
                        //print_r("<br>FETCH: " .  $j);
                        $sCon = $this->connection->select('epal_student', 'eStudent')
                            ->fields('eStudent', array('id', 'currentclass', 'currentepal', 'second_period'))
                            ->condition('eStudent.id', 1 + $sizeOfBlock * ($j-1), '>=')
                            ->condition('eStudent.id', $j * $sizeOfBlock, '<=');
                        $epalStudents = $sCon->execute()->fetchAll(\PDO::FETCH_OBJ);

                        if ($this->locateStudent($this->choice_id, $epalStudents) === self::ERROR_DB) {
				            $transaction->rollback();
                            return $this->respondWithStatus([
                                "message" => t("Unexpected Error in locateStudent function")
                            ], Response::HTTP_INTERNAL_SERVER_ERROR);
                        }

                        $num = $num + sizeof($epalStudents);
                        $j = $j + 1;
                    }
                } 
				else { // $this->choice_id !== 1
                    if (sizeof($this->pendingStudents) != 0) {
                        $sCon = $this->connection->select('epal_student', 'eStudent')
                            ->fields('eStudent', array('id', 'currentclass', 'currentepal', 'second_period'))
                            ->condition('eStudent.id', $this->pendingStudents, 'IN');
                        $epalStudents = $sCon->execute()->fetchAll(\PDO::FETCH_OBJ);

                        if ($this->locateStudent($this->choice_id, $epalStudents) === self::ERROR_DB) {
				            $transaction->rollback();
                            return $this->respondWithStatus([
                                "message" => t("Unexpected Error in locateStudent function")
                            ], Response::HTTP_INTERNAL_SERVER_ERROR);
                        }
                    } else { // αν δεν υπάρχουν εκκρεμότητες, μην συνεχίζεις με άλλο πέρασμα
                        break;
                    }
                }

                // Για κάθε σχολείο βρες τα τμήματα
                // Για κάθε τμήμα βρες αν χωράνε και διευθέτησε (checkCapacityAndArrange)
                // checkCapacityAndArrange (school_id, class_id, sectorORcourse_id, limitUp, schoolCapacity)

                $sCon = $this->connection->select('eepal_school_field_data', 'eSchool')
                    ->fields('eSchool', array('id', 'capacity_class_a', 'operation_shift'));
                $eepalSchools = $sCon->execute()->fetchAll(\PDO::FETCH_OBJ);

                foreach ($eepalSchools as $eepalSchool) {
                    if ($this->checkCapacityAndArrange($eepalSchool->id, "1", "-1", $limitUp_class, $eepalSchool->capacity_class_a) === self::ERROR_DB) {
						$transaction->rollback();
                        return $this->respondWithStatus([
                            "message" => t("Unexpected Error in checkCapacityAndArrange function")
                        ], Response::HTTP_INTERNAL_SERVER_ERROR);
                    }

                    $sCon = $this->connection->select('eepal_sectors_in_epal_field_data', 'eSchool')
                        ->fields('eSchool', array('epal_id', 'sector_id', 'capacity_class_sector'))
                        ->condition('eSchool.epal_id', $eepalSchool->id, '=');
                    $eepalSectorsInEpal = $sCon->execute()->fetchAll(\PDO::FETCH_OBJ);
                    foreach ($eepalSectorsInEpal as $eepalSecInEp) {
                        if ($this->checkCapacityAndArrange($eepalSchool->id, "2", $eepalSecInEp->sector_id, $limitUp_class, $eepalSecInEp->capacity_class_sector) === self::ERROR_DB) {
				            $transaction->rollback();
                            return $this->respondWithStatus([
                                "message" => t("Unexpected Error in checkCapacityAndArrange function")
                            ], Response::HTTP_INTERNAL_SERVER_ERROR);
                        }
                    }

                    $sCon = $this->connection->select('eepal_specialties_in_epal_field_data', 'eSchool')
                        ->fields('eSchool', array('epal_id', 'specialty_id', 'capacity_class_specialty'))
                        ->condition('eSchool.epal_id', $eepalSchool->id, '=');
                    $eepalSpecialtiesInEpal = $sCon->execute()->fetchAll(\PDO::FETCH_OBJ);
                    foreach ($eepalSpecialtiesInEpal as $eepalSpecialInEp) {
                        //Γ' Λυκείου
                        if ($this->checkCapacityAndArrange($eepalSchool->id, "3", $eepalSpecialInEp->specialty_id, $limitUp_class, $eepalSpecialInEp->capacity_class_specialty) === self::ERROR_DB) {
				            $transaction->rollback();
                            return $this->respondWithStatus([
                                "message" => t("Unexpected Error in checkCapacityAndArrange function")
                            ], Response::HTTP_INTERNAL_SERVER_ERROR);
                        }
                        //Δ' Λυκείου
                        if ($eepalSchool->operation_shift === "ΕΣΠΕΡΙΝΟ") {
                            if ($this->checkCapacityAndArrange($eepalSchool->id, "4", $eepalSpecialInEp->specialty_id, $limitUp_class, $eepalSpecialInEp->capacity_class_specialty) === self::ERROR_DB) {
					            $transaction->rollback();
                                return $this->respondWithStatus([
                                    "message" => t("Unexpected Error in checkCapacityAndArrange function")
                                ], Response::HTTP_INTERNAL_SERVER_ERROR);
                            }
                        }
                    }
                } //end for each school/department

                $this->choice_id++;
            } //end while

            if ($this->findSmallClasses() === self::ERROR_DB) {
				$transaction->rollback();
247
				return $this->respondWithStatus([
248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264
					"message" => t("Unexpected Error in findSmallClasses function AFTER initial Distribution!")
				], Response::HTTP_INTERNAL_SERVER_ERROR);
				// αν αποτύχει, δεν γίνεται rollback. --> Λύση: διαγραφή των όποιων αποτελεσμάτων
                // if ($this->initializeResults() === self::ERROR_DB) {
                //         return $this->respondWithStatus([
                //                 "message" => t("Unexpected Error in initializeResults function AFTER findSmallClasses call Function")
                //             ], Response::HTTP_INTERNAL_SERVER_ERROR);
                // }
            }
        } 
        catch (\Exception $e) {
            $this->logger->warning($e->getMessage());
            $transaction->rollback();
            return $this->respondWithStatus([
				"message" => t("An unexpected problem occured in createDistribution Method")
			], Response::HTTP_INTERNAL_SERVER_ERROR);
        }
265

266 267 268 269
		return $this->respondWithStatus([
			'message' => "Distribution has made successfully",
		], Response::HTTP_OK);
    }
270

271

272 273
    public function locateStudent($choice_id, &$epalStudents)
    {
274

275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320
        $epal_dist_id = -1;
        $specialization_id = -1;

        try {
            foreach ($epalStudents as $epalStudent) {
                //print_r("<br>ΚΑΤΑΝΟΜΗ ΜΑΘΗΤΩΝ ΝΟ: " . $choice_id);
                //print_r("<br>ΜΑΘΗΤΗΣ: " .  $epalStudent->id);

                $clCon = $this->connection->select('epal_student_epal_chosen', 'epals')
                    ->fields('epals', array('student_id', 'epal_id', 'choice_no'))
                    ->condition('epals.student_id', $epalStudent->id, '=')
                    ->condition('epals.choice_no', $choice_id, '=');
                $epalSchoolsChosen = $clCon->execute()->fetchAll(\PDO::FETCH_OBJ);

                if (sizeof($epalSchoolsChosen) !==  0) {
                    $epalSchoolChos = reset($epalSchoolsChosen);
                    //print_r(" SCHOOL_ID:" . $epalSchoolChos->epal_id . " STUDENT_ID " . $epalStudent->id);
                    $epal_dist_id = $epalSchoolChos->epal_id;

                    if ($epalStudent->currentclass === "2") {
                        $clCon = $this->connection->select('epal_student_sector_field', 'sectors')
                            ->fields('sectors', array('student_id', 'sectorfield_id'))
                            ->condition('sectors.student_id', $epalStudent->id, '=');
                        $epalSectorChosen = $clCon->execute()->fetchAll(\PDO::FETCH_OBJ);
                        $epalSecChos = reset($epalSectorChosen);
                    } //Δ'Λυκείου - Γ' Λυκείου
                    elseif ($epalStudent->currentclass === "3" || $epalStudent->currentclass === "4") {
                        $clCon = $this->connection->select('epal_student_course_field', 'courses')
                            ->fields('courses', array('student_id', 'coursefield_id'))
                            ->condition('courses.student_id', $epalStudent->id, '=');
                        $epalCourseChosen = $clCon->execute()->fetchAll(\PDO::FETCH_OBJ);
                        $epalCourChos = reset($epalCourseChosen);
                    }

                    if ($epalStudent->currentclass === "2") {
                        $specialization_id = $epalSecChos->sectorfield_id;
                    } //Δ'Λυκείου - Γ' Λυκείου
                    elseif ($epalStudent->currentclass === "3" || $epalStudent->currentclass === "4") {
                        $specialization_id = $epalCourChos->coursefield_id;
                    } else {
                        $specialization_id = -1;
                    }

                    $timestamp = strtotime(date("Y-m-d"));

                    $this->connection->insert('epal_student_class')->fields(
321 322
                        array(
							'id' => $this->globalCounterId++,
323 324 325 326 327 328 329 330 331 332 333 334 335 336
                            'uuid' => \Drupal::service('uuid')->generate(),
                            'langcode' => $this->language,
                            'user_id' => $this->currentuser,
                            'student_id'=> $epalStudent->id,
                            'epal_id'=> $epal_dist_id,
                            'currentclass' => $epalStudent->currentclass,
                            'currentepal' => $epalStudent->currentepal,
                            'specialization_id' => $specialization_id,
                            //'points' => $epalStudent->points,
                            'distribution_id' => $choice_id,
                            'finalized' => 1,
                            'second_period' => $epalStudent->second_period,
                            'status' => 1,
                            'created' => $timestamp,
337 338
                            'changed' => $timestamp
						)
339 340 341 342 343 344 345 346 347 348
                    )->execute();
                } //end if
            }   //foreach
        } catch (\Exception $e) {
            $this->logger->warning($e->getMessage());
            return self::ERROR_DB;
        }

        return self::SUCCESS;
    }
349

350

351 352 353 354 355 356 357 358 359 360 361 362 363 364 365
    public function retrieveCapacityLimitUp($className)
    {
        try {
            $clCon = $this->connection->select('epal_class_limits', 'classLimits')
             ->fields('classLimits', array('limit_up'))
             ->condition('classLimits.name', $className, '=');
            $results = $clCon->execute()->fetchAll(\PDO::FETCH_OBJ);
            $row = reset($results);
        } catch (\Exception $e) {
            $this->logger->warning($e->getMessage());
            return self::ERROR_DB;
        }

          return $row->limit_up;
    }
366

367

368 369
    public function checkCapacityAndArrange($epalId, $classId, $secCourId, $limitup, $capacity)
    {
370

371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409
        if (!isset($capacity)) {
            //print_r("<br> ΜΠΗΚΑ!!! ");
            //print_r("<br> ΣΧΟΛΕΙΟ: " .  $epalId . " ΤΑΞΗ: "  . $classId . " ΤΟΜΕΑΣ/ΕΙΔΙΚΟΤΗΤΑ: " . $secCourId .  " ΧΩΡΗΤΙΚΟΤΗΤΑ: " . $capacity);
            $capacity = 0;
        }

        try {
            $clCon = $this->connection->select('epal_student_class', 'studentClass')
                ->fields('studentClass', array('epal_id', 'student_id', 'points', 'currentepal', 'currentclass', 'specialization_id'))
                ->condition('studentClass.epal_id', $epalId, '=')
                ->condition('studentClass.currentclass', $classId, '=')
                ->condition('studentClass.specialization_id', $secCourId, '=');
            $epalStudentClass = $clCon->execute()->fetchAll(\PDO::FETCH_OBJ);

            $limit = $limitup * $capacity;
            if (sizeof($epalStudentClass) > $limit) {
                //print_r("<br>ΥΠΕΡΧΕΙΛΙΣΗ!");

                //foreach ($epalStudentClass as $epalStudCl)	{
                    //Υπολογισμός μορίων του μαθητή και (πιθανή) αποθήκευσή τους
                    //ΣΗΜΕΙΩΣΗ: Ο υπoλογισμός γίνεται στο front-end
                //}
                $this->makeSelectionOfStudents($epalStudentClass, $limit);
            } else { //αφαίρεσε όσους μαθητές βρίσκονται στον πίνακα εκκρεμοτήτων
                foreach ($epalStudentClass as $epalStudCl) {
                    if ($this->choice_id !== 1) {
                        ////διέγραψε τον μαθητή από τον πίνακα εκκρεμοτήτων (αν βρίσκεται εκεί)
                        $this->removeFromPendingStudents($epalStudCl->student_id);
                    }
                }
            }
        } // end try
        catch (\Exception $e) {
            $this->logger->warning($e->getMessage());
            return self::ERROR_DB;
        }

        return self::SUCCESS;
    }
410

411

412 413 414 415 416 417 418
    public function removeFromPendingStudents($val)
    {
        if (($key = array_search($val, $this->pendingStudents)) !== false) {
            unset($this->pendingStudents[$key]);
        }
        //$this->pendingStudents = array_diff($this->pendingStudents, array($val));
    }
419

420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470
    public function makeSelectionOfStudents_VERSION_WITH_POINTS(&$students, $limit)
    {
        //συνάρτηση επιλογής μαθητών σε περίπτωση υπερχείλισης
        // (1) έχουν απόλυτη προτεραιότητα όσοι ήδη φοιτούσαν στο σχολείο (σε περίπτωση που φοιτούσαν περισσότεροι από την χωρητικότητα, τους δεχόμαστε όλους)
        // (2) αν απομένουν κενές θέσεις, επέλεξε από τους εναπομείναντες μαθητές αυτούς με τα περισσότερα μόρια. Σε περίπτωση ισοβαθμίας δεχόμαστε όλους όσους ισοβαθμούν.

        foreach ($students as $student) {
            $student->student_id;
            //print_r("<br>STUDENT_ID:" . $student->student_id);
        }

        //εύρεση αριθμού μαθητών που ήδη φοιτούσαν στο σχολείο
        $cnt = 0;
        foreach ($students as $student) {
            if ($student->currentepal === $student->epal_id) {
                $cnt++;
                if ($this->choice_id !== 1) {
                    ////διέγραψε τον μαθητή από τον πίνακα εκκρεμοτήτων (αν βρίσκεται εκεί)
                    $this->removeFromPendingStudents($student->student_id);
                }
            }
        }
        //print_r("<br>#ΕΓΓΡΑΦΩΝ ΠΟΥ ΟΙ ΜΑΘΗΤΕΣ ΦΟΙΤΟΥΣΑΝ ΗΔΗ:" . $cnt);

        $newlimit = $limit - $cnt;
        //print_r("<br>ΑΝΩΤΑΤΟ ΟΡΙΟ ΜΑΘΗΤΩΝ:" . $limit);
        //print_r("<br>#ΜΑΘΗΤΩΝ ΓΙΑ ΝΑ ΕΠΙΛΕΓΟΥΝ ΜΕ ΜΟΡΙΑ:" . $newlimit);

        $points_arr = [];
        foreach ($students as $student) {
            if ($student->currentepal !== $student->epal_id) {
                $points_arr[] = $student->points;
            }
        }

        rsort($points_arr);
        //for ($i=0; $i < sizeof($points_arr); $i++)
            //print_r("<br>ΜΟΡΙΑ ΜΕΤΑ ΤΗΝ ΤΑΞΙΝΟΜΙΣΗ: " . $points_arr[$i]);

        //print_r("<br>ΟΡΙΟ ΜΟΡΙΩΝ: " . $points_arr[$newlimit-1]);

        $transaction = $this->connection->startTransaction();

        foreach ($students as $student) {
            if ($student->currentepal !== $student->epal_id) {
                if ($student->points < $points_arr[$newlimit-1]) {
                    //print_r("<br>ΣΕ ΕΚΚΡΕΜΟΤΗΤΑ - ΔΙΑΓΡΑΦΗ: " . $student->student_id);
                    //βάλε τον μαθητή στον πίνακα εκκρεμοτήτων και διέγραψέ τον από τον προσωρινό πίνακα αποτελεσμάτων
                    array_push($this->pendingStudents, $student->student_id);
                    try {
                        $this->connection->delete('epal_student_class')
471 472
							->condition('student_id', $student->student_id)
							->execute();
473 474 475 476
                    } catch (\Exception $e) {
                        $this->logger->warning($e->getMessage());
                        $transaction->rollback();
                        return $this->respondWithStatus([
477 478
							"message" => t("An unexpected problem occured during DELETE proccess in makeSelectionOfStudents Method of Distribution")
						], Response::HTTP_INTERNAL_SERVER_ERROR);
479 480 481 482 483 484 485 486 487 488 489
                    }
                } else {
                    if ($this->choice_id !== 1) {
                        //διέγραψε τον μαθητή από τον πίνακα εκκρεμοτήτων (αν βρίσκεται εκεί)
                        $this->removeFromPendingStudents($student->student_id);
                    }
                }
            }
        }

        return $this->respondWithStatus([
490 491
			"message" => t("makeSelectionOfStudents Method of Distribution has made successfully")
		], Response::HTTP_OK);
492
    }
493

494

495

496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561
    public function makeSelectionOfStudents(&$students, $limit)
    {
        // συνάρτηση επιλογής μαθητών σε περίπτωση υπερχείλισης
        // (1) έχουν απόλυτη προτεραιότητα όσοι ήδη φοιτούσαν στο σχολείο (σε περίπτωση που φοιτούσαν περισσότεροι από την χωρητικότητα, τους δεχόμαστε όλους)
        // (2) αν απομένουν κενές θέσεις,...τοποθέτησε και όλους τους άλλους!!.

        //αν capacity = 0, ..διέγραψέ τους από εκεί που τοποθετήθηκαν προσωρινά
        if ($limit === 0) {
            foreach ($students as $student) {
                array_push($this->pendingStudents, $student->student_id);
                try {
                    $this->connection->delete('epal_student_class')
                        ->condition('student_id', $student->student_id)
                        ->execute();
                } catch (\Exception $e) {
                    $this->logger->warning($e->getMessage());
                    return self::ERROR_DB;
                }
            }
            return self::SUCCESS;
        }

        // εύρεση αριθμού μαθητών που ήδη φοιτούσαν στο σχολείο
        $cnt = 0;
        foreach ($students as $student) {
            if ($student->currentepal === $student->epal_id) {
                $cnt++;
                if ($this->choice_id !== 1) {
                    // διέγραψε τον μαθητή από τον πίνακα εκκρεμοτήτων (αν βρίσκεται εκεί)
                    // Κάτι τέτοιο δεν είναι δυνατό πια! (έκδοση χωρίς μόρια..)
                    $this->removeFromPendingStudents($student->student_id);
                }
            }
        }
        //print_r("<br>#ΕΓΓΡΑΦΩΝ ΠΟΥ ΟΙ ΜΑΘΗΤΕΣ ΦΟΙΤΟΥΣΑΝ ΗΔΗ:" . $cnt);

        $newlimit = $limit - $cnt;
        //print_r("<br>ΑΝΩΤΑΤΟ ΟΡΙΟ ΜΑΘΗΤΩΝ:" . $limit);

        //Αν δεν απέμειναν θέσεις (δηλαδή αν η χωρητικότητα είναι μικρότερη ή ίση από το πλήθος μαθητών που ήδη φοιτούν στο σχολείο)
        //τότε διέγραψέ τους από τον προσωρινό πίνακα αποτελεσμάτων και βάλε τους στον στον πίνακα εκκρεμοτήτων

        foreach ($students as $student) {
            if ($student->currentepal !== $student->epal_id) {
                if ($newlimit <= 0) {
                    //print_r("<br>ΣΕ ΕΚΚΡΕΜΟΤΗΤΑ - ΔΙΑΓΡΑΦΗ: " . $student->student_id);
                    array_push($this->pendingStudents, $student->student_id);
                    try {
                        $this->connection->delete('epal_student_class')
                            ->condition('student_id', $student->student_id)
                            ->execute();
                    } catch (\Exception $e) {
                        $this->logger->warning($e->getMessage());
                        return self::ERROR_DB;
                    }
                } // endif new limit
                else { // $newlimit > 0
                    if ($this->choice_id !== 1) {
                            $this->removeFromPendingStudents($student->student_id);
                    }
                }
            } // endif currentepal
        } // end foreach

        return self::SUCCESS;
    }
562

563 564
    private function respondWithStatus($arr, $s)
    {
565 566 567
		$res = new JsonResponse($arr);
		$res->setStatusCode($s);
		return $res;
568
    }
569

570 571
    private function initializeResults()
    {
572
		//initialize/empty epal_student_class if there are already data in it!
573 574 575 576 577 578
        try {
            $this->connection->delete('epal_student_class')->execute();
        } catch (\Exception $e) {
            $this->logger->warning($e->getMessage());
            return self::ERROR_DB;
        }
579

580 581
		return self::SUCCESS;
    }
582

583 584
    private function findSmallClasses()
    {
585

586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640
        //Για κάθε σχολείο βρες τα ολιγομελή τμήματα
        $sCon = $this->connection->select('eepal_school_field_data', 'eSchool')
            ->fields('eSchool', array('id', 'metathesis_region','operation_shift'));
        $eepalSchools = $sCon->execute()->fetchAll(\PDO::FETCH_OBJ);

        foreach ($eepalSchools as $eepalSchool) {
            //isSmallClass (school_id, class_id, sectorORcourse_id, school_category_metathesis)

            // Α' τάξη
            if ($this->isSmallClass($eepalSchool->id, "1", "-1", $eepalSchool->metathesis_region) === self::SMALL_CLASS) {
                //print_r("<br> ΚΛΗΣΗ markStudentsInSmallClass: SCHOOL_ID: " . $eepalSchool->id . " CLASSID: " . "1 " . "SECTOR/COURSE ID: " . "-1 ");
                if ($this->markStudentsInSmallClass($eepalSchool->id, "1", "-1") === self::ERROR_DB) {
                    return self::ERROR_DB;
                }
            }

            // Β' τάξη
            $sCon = $this->connection->select('eepal_sectors_in_epal_field_data', 'eSchool')
                ->fields('eSchool', array('epal_id', 'sector_id'))
                ->condition('eSchool.epal_id', $eepalSchool->id, '=');
            $eepalSectorsInEpal = $sCon->execute()->fetchAll(\PDO::FETCH_OBJ);
            foreach ($eepalSectorsInEpal as $eepalSecInEp) {
                if ($this->isSmallClass($eepalSchool->id, "2", $eepalSecInEp->sector_id, $eepalSchool->metathesis_region) === self::SMALL_CLASS) {
                    if ($this->markStudentsInSmallClass($eepalSchool->id, "2", $eepalSecInEp->sector_id) === self::ERROR_DB) {
                        return self::ERROR_DB;
                    }
                }
            }

            // Γ' τάξη
            $sCon = $this->connection->select('eepal_specialties_in_epal_field_data', 'eSchool')
                ->fields('eSchool', array('epal_id', 'specialty_id'))
                ->condition('eSchool.epal_id', $eepalSchool->id, '=');
            $eepalSpecialtiesInEpal = $sCon->execute()->fetchAll(\PDO::FETCH_OBJ);
            foreach ($eepalSpecialtiesInEpal as $eepalSpecialInEp) {
                if ($this->isSmallClass($eepalSchool->id, "3", $eepalSpecialInEp->specialty_id, $eepalSchool->metathesis_region) === self::SMALL_CLASS) {
                    if ($this->markStudentsInSmallClass($eepalSchool->id, "3", $eepalSpecialInEp->specialty_id) === self::ERROR_DB) {
                        return self::ERROR_DB;
                    }
                }
            }

            // Δ' τάξη
            if ($eepalSchool->operation_shift === "ΕΣΠΕΡΙΝΟ") {
                $sCon = $this->connection->select('eepal_specialties_in_epal_field_data', 'eSchool')
                    ->fields('eSchool', array('epal_id', 'specialty_id'))
                    ->condition('eSchool.epal_id', $eepalSchool->id, '=');
                $eepalSpecialtiesInEpal = $sCon->execute()->fetchAll(\PDO::FETCH_OBJ);
                foreach ($eepalSpecialtiesInEpal as $eepalSpecialInEp) {
                    if ($this->isSmallClass($eepalSchool->id, "4", $eepalSpecialInEp->specialty_id, $eepalSchool->metathesis_region) === self::SMALL_CLASS) {
                        if ($this->markStudentsInSmallClass($eepalSchool->id, "4", $eepalSpecialInEp->specialty_id) === self::ERROR_DB) {
                            return self::ERROR_DB;
                        }
                    }
                }
641
            } //end if ΕΣΠΕΡΙΝΟ
642 643 644 645 646 647 648 649
        } //end for each school/department

        return self::SUCCESS;
    }   //end function


    private function isSmallClass($schoolId, $classId, $sectorOrcourseId, $regionId)
    {
650

651
        $limitDown = $this->retrieveLimitDown($classId, $regionId);
652

653 654 655 656 657
        if ($limitDown === self::NO_CLASS_LIMIT_DOWN) {
            return self::NO_CLASS_LIMIT_DOWN;
        } elseif ($limitDown === self::ERROR_DB) {
            return self::ERROR_DB;
        }
658

659
        $numStudents = $this->countStudents($schoolId, $classId, $sectorOrcourseId);
660

661 662 663
        if ($numStudents === self::ERROR_DB) {
            return self::ERROR_DB;
        }
664

665
        //Αν $numStudents == 0, γύρισε false, ώστε να μη γίνει περιττή κλήση στην markStudentsInSmallClass
666 667 668 669 670
        if (($numStudents < $limitDown) && ($numStudents > 0)) {
            return self::SMALL_CLASS;
        } else {
            return self::NON_SMALL_CLASS;
        }
671 672
    }

673 674
    private function retrieveLimitDown($classId, $regionId)
    {
675

676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692
        try {
            $sCon = $this->connection->select('epal_class_limits', 'eClassLimit')
                ->fields('eClassLimit', array('limit_down'))
                ->condition('eClassLimit.name', $classId, '=')
                ->condition('eClassLimit.category', $regionId, '=');
            $classLimits = $sCon->execute()->fetchAll(\PDO::FETCH_OBJ);
            if (sizeof($classLimits) === 1) {
                $classLimit = reset($classLimits);
                return $classLimit->limit_down;
            } else {
                return self::NO_CLASS_LIMIT_DOWN;
            }
        } //end try
        catch (\Exception $e) {
            $this->logger->warning($e->getMessage());
            return self::ERROR_DB;
        }
693
    } //end function
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708

    private function countStudents($schoolId, $classId, $sectorOrcourseId)
    {
        try {
            $sCon = $this->connection->select('epal_student_class', 'eStudent')
                ->fields('eStudent', array('id'))
                ->condition('eStudent.epal_id', $schoolId, '=')
                ->condition('eStudent.currentclass', $classId, '=')
                ->condition('eStudent.specialization_id', $sectorOrcourseId, '=');
            return $sCon->countQuery()->execute()->fetchField();
        } catch (\Exception $e) {
            $this->logger->warning($e->getMessage());
            return self::ERROR_DB;
        }
    }
709

710 711 712 713
    private function markStudentsInSmallClass($schoolId, $classId, $sectorOrcourseId)
    {
        try {
            $query = $this->connection->update('epal_student_class');
714
            $query->fields(['finalized' => 0]);
715 716 717 718 719 720 721 722 723 724 725 726
            $query->condition('epal_id', $schoolId);
            $query->condition('currentclass', $classId);
            if ($sectorOrcourseId !== "-1") {
                $query->condition('specialization_id', $sectorOrcourseId);
            }
            $query->execute();
        } catch (\Exception $e) {
            $this->logger->warning($e->getMessage());
            return self::ERROR_DB;
        }
        return self::SUCCESS;
    }
727

728 729 730 731 732 733 734 735
    public function locateSecondPeriodStudents(Request $request)
    {
        //POST method is checked
        if (!$request->isMethod('POST')) {
            return $this->respondWithStatus([
				"message" => t("Method Not Allowed")
			], Response::HTTP_METHOD_NOT_ALLOWED);
        }
736

737 738 739 740 741 742 743 744 745
        //user validation
        $authToken = $request->headers->get('PHP_AUTH_USER');
        $users = $this->entityTypeManager->getStorage('user')->loadByProperties(array('name' => $authToken));
        $user = reset($users);
        if (!$user) {
			return $this->respondWithStatus([
				'message' => t("User not found"),
			], Response::HTTP_FORBIDDEN);
        }
746

747 748
        //user role validation
        if (false === in_array('ministry', $user->getRoles())) {
749
			return $this->respondWithStatus([
750 751 752
				'message' => t("User Invalid Role"),
			], Response::HTTP_FORBIDDEN);
        }
753

754 755
        //check where distribution can be done now
        $secondPeriodEnabled = "0";
756

757 758 759 760 761 762 763 764 765 766 767 768 769 770 771
        $config_storage = $this->entityTypeManager->getStorage('epal_config');
        $epalConfigs = $config_storage->loadByProperties(array('id' => 1));
        $epalConfig = reset($epalConfigs);
        if (!$epalConfig) {
             return $this->respondWithStatus([
				'message' => t("EpalConfig Enity not found"),
			], Response::HTTP_FORBIDDEN);
        } else {
             $secondPeriodEnabled = $epalConfig->activate_second_period->getString();
        }
        if ($secondPeriodEnabled === "0") {
             return $this->respondWithStatus([
				'message' => t("secondPeriodEnabled setting is false"),
			], Response::HTTP_FORBIDDEN);
        }
772

773 774
        $transaction = $this->connection->startTransaction();

775 776
        try {
            if ($this->initializeResultsInSecondPeriod() === self::ERROR_DB) {
777
				$transaction->rollback();
778 779 780 781
				return $this->respondWithStatus([
					"message" => t("Unexpected Error in initializeResultsInSecondPeriod function")
				], Response::HTTP_INTERNAL_SERVER_ERROR);
            }
782

783 784 785 786
            $sCon = $this->connection->select('epal_student', 'eStudent')
					->fields('eStudent', array('id', 'currentclass', 'currentepal', 'second_period'))
					->condition('eStudent.second_period', 1, '=');
            $epalStudents = $sCon->execute()->fetchAll(\PDO::FETCH_OBJ);
787

788 789 790
            //τοποθέτηση όλων των μαθητών Β' περιόδου στην πρώτη τους προτίμηση'
            $this->globalCounterId = $this->retrieveLastStudentId() + 1;
            if ($this->locateStudent(1, $epalStudents) === self::ERROR_DB) {
791
				$transaction->rollback();
792 793 794 795 796
				return $this->respondWithStatus([
					"message" => t("Unexpected Error in locateStudent function after calling locateSecondPeriodStudents method"),
					"numOfDeletions" => $num
				], Response::HTTP_INTERNAL_SERVER_ERROR);
            }
797

798
            //επαναϋπολογισμός όλων των ολιγομελών τμημάτων (Προσοχή: αφορά ΟΛΟΥΣ τους μαθητές - κανονικής και Β΄ περιόδου)
799

800 801
            //αρχικοποίηση flag finalize σε 1 για όλους
            if ($this->setFinalize() === self::ERROR_DB) {
802
				$transaction->rollback();
803 804 805 806
				return $this->respondWithStatus([
					"message" => t("Unexpected Error in setFinalize function AFTER locateSecondPeriodStudents!")
				], Response::HTTP_INTERNAL_SERVER_ERROR);
            }
807

808 809
            //εύρεση ολιγομελών και καταχώρηση μαθητών σε αυτά με κατάλληλη ένδειξη (finalize=0)
            if ($this->findSmallClasses() === self::ERROR_DB) {
810 811 812 813 814 815 816
				//αν αποτύχει, δεν γίνεται rollback. --> Λύση: διαγρα΄φή των όποιων αποτελεσμάτων
                // if ($this->initializeResultsInSecondPeriod() === self::ERROR_DB) {
				// 	$transaction->rollback();
				// 	return $this->respondWithStatus([
				// 		"message" => t("Unexpected Error in initializeResults function AFTER findSmallClasses call Function")
				// 	], Response::HTTP_INTERNAL_SERVER_ERROR);
                // }
817

818
				$transaction->rollback();
819 820 821 822 823 824
				return $this->respondWithStatus([
					"message" => t("Unexpected Error in findSmallClasses function AFTER locateSecondPeriodStudents!")
				], Response::HTTP_INTERNAL_SERVER_ERROR);
            }
        } catch (\Exception $e) {
            $this->logger->warning($e->getMessage());
825
			$transaction->rollback();
826 827 828 829
            return $this->respondWithStatus([
				"message" => t("An unexpected problem occured in locateSecondPeriodStudents Method")
			], Response::HTTP_INTERNAL_SERVER_ERROR);
        }
830

831 832 833 834
		return $this->respondWithStatus([
			'message' => "locateSecondPeriodStudents has made successfully",
		], Response::HTTP_OK);
    }
835

836 837 838 839 840 841 842 843 844 845 846 847 848 849
    private function setFinalize()
    {
        try {
            $query = $this->connection->update('epal_student_class');
            $query->fields([
                'finalized' => 1,
            ]);
            $query->execute();
        } catch (\Exception $e) {
            $this->logger->warning($e->getMessage());
            return self::ERROR_DB;
        }
        return self::SUCCESS;
    }
850

851 852
    private function initializeResultsInSecondPeriod()
    {
853
		//initialize/empty epal_student_class if there are already data in it!
854 855 856 857 858 859 860 861 862
        try {
            //$this->connection->delete('epal_student_class')->execute();
            $con = $this->connection->prepare("delete from epal_student_class where second_period = 1 ");
            $con->execute();
            //$num = $con->rowCount();
        } catch (\Exception $e) {
            $this->logger->warning($e->getMessage());
            return self::ERROR_DB;
        }
863 864

		return self::SUCCESS;
865
    }
866

867 868 869
    private function retrieveLastStudentId()
    {
        $sCon = $this->connection->select('epal_student', 'eStudent')
870
			->fields('eStudent', array('id'));
871 872 873 874 875 876
        $sCon->orderBy('eStudent.id', 'desc');
        $epalStudents = $sCon->execute()->fetchAll(\PDO::FETCH_OBJ);
        if ($epalStudents) {
            $epalStrudent = reset($epalStudents);
            return $epalStrudent->id;
        }
877

878 879
        return 0;
    }
880
}