<?php

/**
 * OrangeHRM is a comprehensive Human Resource Management (HRM) System that captures
 * all the essential functionalities required for any enterprise.
 * Copyright (C) 2006 OrangeHRM Inc., http://www.orangehrm.com
 *
 * OrangeHRM is free software; you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * OrangeHRM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program;
 * if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA  02110-1301, USA
 *
 */

/**
 * Leave Entitlement Dao class
 */
class LeaveEntitlementDao extends BaseDao {

    protected static $pendingStatusIds = null;
    protected $leaveEntitlementStrategy;
    protected $leaveConfigService;
    protected $logger;
    
    /**
     * Get Logger instance. Creates if not already created.
     *
     * @return Logger
     */
    protected function getLogger() {
        if (is_null($this->logger)) {
            $this->logger = Logger::getLogger('leave.LeaveEntitlementDao');
        }

        return($this->logger);
    }
    
    public function getLeaveConfigService() {
        if (!($this->leaveConfigService instanceof LeaveConfigurationService)) {
            $this->leaveConfigService = new LeaveConfigurationService();
        }        
        return $this->leaveConfigService;
    }

    public function setLeaveConfigService($leaveConfigService) {
        $this->leaveConfigService = $leaveConfigService;
    }
    
    public function getLeaveEntitlementStrategy() {
        if (!isset($this->leaveEntitlementStrategy)) {
            
            $strategyClass = $this->getLeaveConfigService()->getLeaveEntitlementConsumptionStrategy();            
            $this->leaveEntitlementStrategy = new $strategyClass;
        }
        
        return $this->leaveEntitlementStrategy;
    }
    
    public function setLeaveEntitlementStrategy($leaveEntitlementStrategy) {
        $this->leaveEntitlementStrategy = $leaveEntitlementStrategy;
    }    

    public function getPendingStatusIds() {
        if (is_null(self::$pendingStatusIds)) {
            $q = Doctrine_Query::create()
                    ->select('s.status')
                    ->from('LeaveStatus s')
                    ->where("s.name LIKE '%PENDING APPROVAL%'");

            self::$pendingStatusIds = $q->execute(array(), Doctrine_Core::HYDRATE_SINGLE_SCALAR);
            if (count(self::$pendingStatusIds) == 0) {
                $logger = $this->getLogger();
                $logger->error('No PENDING APPROVAL leave status found!');
                throw new DaoException("No PENDING APPROVAL leave statuses in ohrm_leave_status table!");
            }
        }

        return self::$pendingStatusIds;
    }

    public function searchLeaveEntitlements(LeaveEntitlementSearchParameterHolder $searchParameters) {
        try {

            $q = Doctrine_Query::create()->from('LeaveEntitlement le');

            $deletedFlag = $searchParameters->getDeletedFlag();
            $leaveTypeId = $searchParameters->getLeaveTypeId();
            $empNumber = $searchParameters->getEmpNumber();
            $fromDate = $searchParameters->getFromDate();
            $toDate = $searchParameters->getToDate();
            $idList = $searchParameters->getIdList();
            $validDate = $searchParameters->getValidDate();
            $empIdList = $searchParameters->getEmpIdList();
            $hydrationMode = $searchParameters->getHydrationMode();
            $orderField = $searchParameters->getOrderField();
            $order = $searchParameters->getOrderBy();
            $order = (strcasecmp($order, 'DESC') == 0) ? 'DESC' : 'ASC';
            $entitlementTypes = $searchParameters->getEntitlementTypes();

            $params = array();


            if ($deletedFlag === true) {
                $q->addWhere('le.deleted = 1');
            } else if ($deletedFlag === false) {
                $q->addWhere('le.deleted = 0');
            }

            if (!empty($leaveTypeId)) {
                $q->addWhere('le.leave_type_id = :leaveTypeId');
                $params[':leaveTypeId'] = $leaveTypeId;
            }

            if (!is_null($empNumber)) {
                $q->addWhere('le.emp_number = :empNumber');
                $params[':empNumber'] = $empNumber;
            }

            if (!empty($fromDate) && !empty($toDate)) {
                $q->addWhere('(le.from_date BETWEEN :fromDate AND :toDate)');

                $params[':fromDate'] = $fromDate;
                $params[':toDate'] = $toDate;
            }
            if (!empty($validDate)) {
                $q->addWhere('(:validDate BETWEEN le.from_date AND le.to_date)');
                $params[':validDate'] = $validDate;
            }
            if (!empty($idList)) {
                $q->andWhereIn('le.id', $idList);
            }
            
            if (is_array($entitlementTypes) && count($entitlementTypes) > 0) {
                
                // We are not using andWhereIn(), because it causes the error:
                // 'Invalid parameter number: mixed named and positional parameters'.
                // This is because andWhereIn() adds positional parameters (? marks),
                // while we are using named parameters for the other parts of the query.
                // Therefore, we are building the whereIn() part using named parameters here.                
                $count = 0;         
                $namedParams = array();
                foreach($entitlementTypes as $entitlementType) {
                    $count++;
                    $namedParam = ':et' . $count;
                    $namedParams[] = $namedParam;                    
                    $params[$namedParam] = $entitlementType;
                }
                $q->andWhere('le.entitlement_type IN (' . implode(',', $namedParams) . ')');
            }
            
            if (!empty($empIdList)) {
                
                // filter empIdList and create comma separated string.
                $filteredIds = array_map(function($item) {
                                return filter_var($item, FILTER_VALIDATE_INT);
                            }, $empIdList);
                            
                // Remove items which did not validate as int (they will be set to false)
                // NOTE: This doesn't cause SQL injection issues because we filter the array
                // and only allow integers in the array.
                $filteredIds = array_filter($filteredIds);                            
                $q->andWhere('le.emp_number IN (' . implode(',', $filteredIds) . ')');
            }

            // We need leave type name
            $q->leftJoin('le.LeaveType l');

            $orderClause = '';

            switch ($orderField) {
                case 'leave_type' :
                    $orderClause = 'l.name ' . $order;
                    break;
                case 'employee_name':
                    $q->leftJoin('le.Employee e');
                    $orderClause = 'e.emp_lastname ' . $order . ', e.emp_firstname ' . $order;
                    break;
                default:
                    $orderClause = $orderField . ' ' . $order;
                    $orderClause = trim($orderClause);
                    break;
            }

            // get predictable sorting
            if (!empty($orderClause)) {
                $orderClause .= ', le.id ASC';
            }

            $q->addOrderBy($orderClause);

            if (!empty($hydrationMode)) {
                $q->setHydrationMode($hydrationMode);
            }


            $results = $q->execute($params);
            return $results;
        } catch (Exception $e) {
            throw new DaoException($e->getMessage(), 0, $e);
        }
    }

    public function getLeaveEntitlement($id) {
        try {
            $leaveEntitlement = Doctrine::getTable('LeaveEntitlement')->find($id);
            return ($leaveEntitlement === false) ? null : $leaveEntitlement;
        } catch (Exception $e) {
            throw new DaoException($e->getMessage(), 0, $e);
        }
    }

    public function saveLeaveEntitlement(LeaveEntitlement $leaveEntitlement) {
        $conn = Doctrine_Manager::connection();
        $conn->beginTransaction();

        try {
            $leaveEntitlement->save();
            $leaveEntitlement = $this->linkLeaveToUnusedLeaveEntitlement($leaveEntitlement);

            $conn->commit();
            return $leaveEntitlement;
        } catch (Exception $e) {
            $conn->rollback();
            throw new DaoException($e->getMessage(), 0, $e);
        }
    }
    
    protected function bulkLinkLeaveToUnusedLeaveEntitlements($entitlements, $leaveTypeId, $fromDate, $toDate) {
        
        // sort collection by $empNumber key;
        $result = ksort($entitlements, SORT_NUMERIC);
        if (!$result) {
            echo "Sort failed";
            die();
        }
                
        $empNumbers = array_keys($entitlements);            
        $leaveList = $this->getLeaveWithoutEntitlements($empNumbers, $leaveTypeId, $fromDate, $toDate);
        $leaveListByEmployee = array();
        
        foreach ($leaveList as $leave) {
            $empNumber = $leave['empNumber'];
            
            if (isset($leaveListByEmployee[$empNumber])) {
                $leaveListByEmployee[$empNumber][] = $leave;
            } else {
                $leaveListByEmployee[$empNumber] = array($leave);
            }
        }
        
        
        $query = Doctrine_Query::create()
                    ->from('LeaveLeaveEntitlement l')
                    ->where('l.leave_id = ?')
                    ->andWhere('l.entitlement_id = ?');        
            
        foreach ($entitlements as $empNumber => $leaveEntitlement) {
            
            $balance = $leaveEntitlement->getNoOfDays() - $leaveEntitlement->getDaysUsed();
            
            if ($balance > 0 && isset($leaveListByEmployee[$empNumber])) {
                $entitlementId = $leaveEntitlement->getId();

                foreach ($leaveListByEmployee[$empNumber] as $leave) {
                    $daysLeft = $leave['days_left'];
                    $leaveId = $leave['id'];
                    $daysToAssign = $daysLeft > $balance ? $balance : $daysLeft;

                    $leaveEntitlement->setDaysUsed($leaveEntitlement->getDaysUsed() - $daysToAssign);
                    $balance -= $daysToAssign;

                    // assign to leave
                    $entitlementAssignment = $query->fetchOne(array($leaveId, $entitlementId));

                    if ($entitlementAssignment === false) {
                        $entitlementAssignment = new LeaveLeaveEntitlement();
                        $entitlementAssignment->setLeaveId($leaveId);
                        $entitlementAssignment->setEntitlementId($entitlementId);
                        $entitlementAssignment->setLengthDays($daysToAssign);
                    } else {
                        $entitlementAssignment->setLengthDays($entitlementAssignment->getLengthDays() + $daysToAssign);
                    }
                    $entitlementAssignment->save();
                    $entitlementAssignment->free();

                    if ($balance <= 0) {
                        break;
                    }
                }
            
            }
        }
            
        return $leaveEntitlement;
    }    

    protected function linkLeaveToUnusedLeaveEntitlement(LeaveEntitlement $leaveEntitlement) {
        $balance = $leaveEntitlement->getNoOfDays() - $leaveEntitlement->getDaysUsed();
        $entitlementId = $leaveEntitlement->getId();

        if ($balance > 0) {
            $leaveList = $this->getLeaveWithoutEntitlements($leaveEntitlement->getEmpNumber(), $leaveEntitlement->getLeaveTypeId(), $leaveEntitlement->getFromDate(), $leaveEntitlement->getToDate());

            $query = Doctrine_Query::create()
                        ->from('LeaveLeaveEntitlement l')
                        ->where('l.leave_id = ?')
                        ->andWhere('l.entitlement_id = ?');
            
            foreach ($leaveList as $leave) {
                $daysLeft = $leave['days_left'];
                $leaveId = $leave['id'];
                $daysToAssign = $daysLeft > $balance ? $balance : $daysLeft;

                $leaveEntitlement->setDaysUsed($leaveEntitlement->getDaysUsed() - $daysToAssign);
                $balance -= $daysToAssign;

                // assign to leave
                $entitlementAssignment = $query->fetchOne(array($leaveId, $entitlementId));

                if ($entitlementAssignment === false) {
                    $entitlementAssignment = new LeaveLeaveEntitlement();
                    $entitlementAssignment->setLeaveId($leaveId);
                    $entitlementAssignment->setEntitlementId($entitlementId);
                    $entitlementAssignment->setLengthDays($daysToAssign);
                } else {
                    $entitlementAssignment->setLengthDays($entitlementAssignment->getLengthDays() + $daysToAssign);
                }
                $entitlementAssignment->save();
                $entitlementAssignment->free();

                if ($balance <= 0) {
                    break;
                }
            }
        }

        return $leaveEntitlement;
    }

    public function deleteLeaveEntitlements($ids) {
        try {
            $q = Doctrine_Query::create()
                    ->update('LeaveEntitlement le')
                    ->set('le.deleted', 1)
                    ->whereIn('le.id', $ids);

            return $q->execute();
        } catch (Exception $e) {
            throw new DaoException($e->getMessage(), 0, $e);
        }
    }

    public function bulkAssignLeaveEntitlements($employeeNumbers, LeaveEntitlement $leaveEntitlement) {
        $conn = Doctrine_Manager::connection();
        $conn->beginTransaction();

        $pdo = Doctrine_Manager::getInstance()->getCurrentConnection()->getDbh();
        try {
            $allEntitlements = array();
            $updateEmpList = array();
            $updateEntitlementIdList = array();
            $savedCount = 0;
            $leaveTypeId = $leaveEntitlement->getLeaveTypeId();
            $fromDate = $leaveEntitlement->getFromDate();
            $toDate = $leaveEntitlement->getToDate();

            $leaveEntitlementSearchParameterHolder = new LeaveEntitlementSearchParameterHolder();
            $leaveEntitlementSearchParameterHolder->setFromDate($fromDate);
            $leaveEntitlementSearchParameterHolder->setLeaveTypeId($leaveTypeId);
            $leaveEntitlementSearchParameterHolder->setToDate($toDate);
            $leaveEntitlementSearchParameterHolder->setEmpIdList($employeeNumbers);
            $leaveEntitlementSearchParameterHolder->setHydrationMode(Doctrine::HYDRATE_ARRAY);

            $entitlementList = $this->searchLeaveEntitlements($leaveEntitlementSearchParameterHolder);
            if (count($entitlementList) > 0) {
                foreach ($entitlementList as $updateEntitlement) {
                    
                    $empNumber = $updateEntitlement['emp_number'];
                    
                    if (!isset($allEntitlements[$empNumber])) {                    
                        $entitlement = new LeaveEntitlement();
                        $noOfDays = $leaveEntitlement->getNoOfDays();
                        $entitlement->setEmpNumber($empNumber);
                        $entitlement->setLeaveTypeId($leaveTypeId);

                        $entitlement->setCreditedDate($leaveEntitlement->getCreditedDate());
                        $entitlement->setCreatedById($leaveEntitlement->getCreatedById());
                        $entitlement->setCreatedByName($leaveEntitlement->getCreatedByName());

                        $entitlement->setEntitlementType($leaveEntitlement->getEntitlementType());
                        $entitlement->setDeleted(0);

                        $entitlement->setNoOfDays($leaveEntitlement->getNoOfDays());
                        $entitlement->setFromDate($fromDate);
                        $entitlement->setToDate($toDate);
                        $entitlement->setId($updateEntitlement['id']);

                        $allEntitlements[$empNumber] = $entitlement;

                        $updateEmpList[] = $updateEntitlement['emp_number'];
                        $updateEntitlementIdList[] = $updateEntitlement['id'];
                        $savedCount++;
                    }
                }


                $updateQuery = sprintf(" UPDATE ohrm_leave_entitlement SET no_of_days=no_of_days+ %f WHERE id IN (%s)", $leaveEntitlement->getNoOfDays(), implode(',', $updateEntitlementIdList));
                $updateStmt = $pdo->prepare($updateQuery);
                $updateStmt->execute();
            }

            $newEmployeeList = array_diff($employeeNumbers, $updateEmpList);
            if (count($newEmployeeList) > 0) {
                $query = " INSERT INTO ohrm_leave_entitlement(`emp_number`,`leave_type_id`,`from_date`,`to_date`,`no_of_days`,`entitlement_type`) VALUES " .
                         "(?, ?, ?, ?, ?, ?)";
                $stmt = $pdo->prepare($query);
                
                foreach ($newEmployeeList as $empNumber) {
                    if (!isset($allEntitlements[$empNumber])) {
                        $entitlement = new LeaveEntitlement();
                        $noOfDays = $leaveEntitlement->getNoOfDays();
                        $entitlement->setEmpNumber($empNumber);
                        $entitlement->setLeaveTypeId($leaveEntitlement->getLeaveTypeId());

                        $entitlement->setCreditedDate($leaveEntitlement->getCreditedDate());
                        $entitlement->setCreatedById($leaveEntitlement->getCreatedById());
                        $entitlement->setCreatedByName($leaveEntitlement->getCreatedByName());

                        $entitlement->setEntitlementType($leaveEntitlement->getEntitlementType());
                        $entitlement->setDeleted(0);

                        $entitlement->setNoOfDays($noOfDays);
                        $entitlement->setFromDate($fromDate);
                        $entitlement->setToDate($toDate);

                        $params = array($empNumber, $leaveEntitlement->getLeaveTypeId(), $fromDate, $toDate, $noOfDays, LeaveEntitlement::ENTITLEMENT_TYPE_ADD);
                        $stmt->execute($params);
                        $entitlement->setId($pdo->lastInsertId());

                        $allEntitlements[$empNumber] = $entitlement;
                        $savedCount++;
                    }
                }
            }
            
            // If leave period is forced, we can bulk assign at once, because from and to date of
            // all leave entitlements will be the same
            $leavePeriodStatus = LeavePeriodService::getLeavePeriodStatus();
            if ($leavePeriodStatus == LeavePeriodService::LEAVE_PERIOD_STATUS_FORCED) {
                $this->bulkLinkLeaveToUnusedLeaveEntitlements($allEntitlements, $leaveTypeId, $fromDate, $toDate);
            } else { 
                foreach ($allEntitlements as $leaveEntitlement) {
                    $this->linkLeaveToUnusedLeaveEntitlement($leaveEntitlement);
                }
            }
            
            $conn->commit();
            return $savedCount;
        } catch (Exception $e) {
            $conn->rollback();
            throw new DaoException($e->getMessage(), 0, $e);
        }
    }

    public function getValidLeaveEntitlements($empNumber, $leaveTypeId, $fromDate, $toDate, $orderField, $order) {
        try {

            $params = array(
                ':leaveTypeId' => $leaveTypeId,
                ':empNumber' => $empNumber,
                ':fromDate' => $fromDate,
                ':toDate' => $toDate
            );
            $q = Doctrine_Query::create()->from('LeaveEntitlement le')
                    ->addWhere('le.deleted = 0')
                    ->addWhere('le.leave_type_id = :leaveTypeId')
                    ->addWhere('le.emp_number = :empNumber')
                    ->addWhere('(le.no_of_days - le.days_used) > 0')
                    ->addWhere('(:fromDate BETWEEN le.from_date AND le.to_date) OR ' .
                    '(:toDate BETWEEN le.from_date AND le.to_date) OR ' .
                    '(le.from_date BETWEEN :fromDate AND :toDate)');

            $order = (strcasecmp($order, 'DESC') == 0) ? 'DESC' : 'ASC';
            $orderClause = $orderField . ' ' . $order;
            $orderClause = trim($orderClause);

            $q->addOrderBy($orderClause);

            $results = $q->execute($params);
            return $results;
        } catch (Exception $e) {
            throw new DaoException($e->getMessage(), 0, $e);
        }
    }

    public function getLinkedLeaveRequests($entitlementIds, $statuses) {
        try {
            $q = Doctrine_Query::create()->from('Leave l')
                    ->leftJoin('l.LeaveEntitlements le')
                    ->andWhereIn('le.id', $entitlementIds)
                    ->andWhereIn('l.status', $statuses)
                    ->addOrderBy('l.id ASC');

            $results = $q->execute();
            return $results;
        } catch (Exception $e) {
            throw new DaoException($e->getMessage(), 0, $e);
        }
    }

    /**
     * Get leave balance as a LeaveBalance object with the following components
     *    * entitlements
     *    * used (taken)
     *    * scheduled
     *    * pending approval
     *    * leave without entitlements
     * 
     * @param int $empNumber Employee Number
     * @param int $leaveTypeId Leave Type ID
     * @param date $asAtDate Balance as at given date
     * @return LeaveBalance Returns leave balance object
     */
    public function getLeaveBalance($empNumber, $leaveTypeId, $asAtDate, $date = NULL) {
        $conn = Doctrine_Manager::connection()->getDbh();

        $pendingIds = $this->getPendingStatusIds();

        $pendingIdList = is_array($pendingIds) ? implode(',', $pendingIds) : $pendingIds;

        $sql = 'SELECT le.no_of_days AS entitled, ' .
                'le.days_used AS used, ' .
                'sum(IF(l.status = 2, lle.length_days, 0)) AS scheduled, ' .
                'sum(IF(l.status IN (' . $pendingIdList . '), lle.length_days, 0)) AS pending, ' .
                'sum(IF(l.status = 3, l.length_days, 0)) AS taken, 0 as notLinked ' .
                'FROM ohrm_leave_entitlement le LEFT JOIN ' .
                'ohrm_leave_leave_entitlement lle ON le.id = lle.entitlement_id LEFT JOIN ' .
                'ohrm_leave l ON l.id = lle.leave_id ' .
                'WHERE le.deleted = 0 AND le.emp_number = ? AND le.leave_type_id = ? ' .
                ' AND le.to_date >= ?';

        $parameters = array($empNumber, $leaveTypeId, $asAtDate);

        if (!empty($date)) {
            $sql .= ' AND ? BETWEEN le.from_date AND le.to_date ';
            $parameters[] = $date;
        }

        $sql .= ' GROUP BY le.id';
        
        $dateLimits = $this->getLeaveEntitlementStrategy()->getLeaveWithoutEntitlementDateLimitsForLeaveBalance($asAtDate, $date, $empNumber, $leaveTypeId);

        if (is_array($dateLimits) && count($dateLimits) > 0) {
            $sql .= ' UNION ALL ' .
                    'SELECT ' .
                    '0 AS entitled, ' .
                    'SUM(l.length_days) AS used, ' .
                    'sum(IF(l.status = 2, l.length_days, 0)) AS scheduled, ' .
                    'sum(IF(l.status IN (' . $pendingIdList . '), l.length_days, 0)) AS pending, ' .
                    'sum(IF(l.status = 3, l.length_days, 0)) AS taken, ' .
                    'sum(l.length_days) AS notLinked ' .
                    'FROM ohrm_leave l ' .
                    'LEFT JOIN ohrm_leave_leave_entitlement lle ON (lle.leave_id = l.id) ' .
                    'WHERE (lle.leave_id IS NULL) AND l.emp_number = ? AND l.leave_type_id = ? AND l.status NOT IN (-1, 0) ' .
                    ' AND l.date BETWEEN ? AND ? ';

            $parameters[] = $empNumber;
            $parameters[] = $leaveTypeId;
            $parameters[] = $dateLimits[0];
            $parameters[] = $dateLimits[1];

            //$parameters[] = $asAtDate;        


            $sql .= 'GROUP BY l.leave_type_id';
        }
        
        $sql = 'SELECT sum(a.entitled) as entitled, sum(a.used) as used, sum(a.scheduled) as scheduled, ' . 
                      'sum(a.pending) as pending, sum(a.taken) as taken, sum(a.notLinked) as notLinked  ' .
                ' FROM (' . $sql . ') as a';

        $statement = $conn->prepare($sql);
        $result = $statement->execute($parameters);

        $adjustmentSql = " SELECT sum(no_of_days) adjustment FROM ohrm_leave_adjustment la" .
                " WHERE la.emp_number = ? AND la.leave_type_id= ?  AND ? BETWEEN la.from_date AND la.to_date";

        $adjustmentParams = array($empNumber, $leaveTypeId, $asAtDate);

        $statementAdjustment = $conn->prepare($adjustmentSql);
        $resultAdjustment = $statementAdjustment->execute($adjustmentParams);

        
        $balance = new LeaveBalance();
        if ($result) {
            if ($statement->rowCount() > 0) {
                $result = $statement->fetch(PDO::FETCH_ASSOC);
                if (!empty($result['entitled'])) {
                    $balance->setEntitled($result['entitled']);
                }
                if (!empty($result['used'])) {
                    $balance->setUsed($result['used']);
                }
                if (!empty($result['scheduled'])) {
                    $balance->setScheduled($result['scheduled']);
                }
                if (!empty($result['pending'])) {
                    $balance->setPending($result['pending']);
                }
                if (!empty($result['taken'])) {
                    $balance->setTaken($result['taken']);
                }
                if (!empty($result['notLinked'])) {
                    $balance->setNotLinked($result['notLinked']);
                }                
            }
        }

        if ($resultAdjustment) {
            $resultAdjustment = $statementAdjustment->fetch(PDO::FETCH_ASSOC);
            if (!empty($resultAdjustment['adjustment'])) {
                $balance->setAdjustment($resultAdjustment['adjustment']);
            }
        }

        $balance->updateBalance();

        return $balance;
    }

    public function getEntitlementUsageForLeave($leaveId) {
        try {
            $conn = Doctrine_Manager::connection()->getDbh();
            $query = "SELECT e.id, e.no_of_days, e.days_used, e.from_date, e.to_date, sum(lle.length_days) as length_days from ohrm_leave_entitlement e " .
                    "left join ohrm_leave_leave_entitlement lle on lle.entitlement_id = e.id where " .
                    "lle.leave_id = ? AND e.deleted = 0 group by e.id order by e.from_date ASC";
            $statement = $conn->prepare($query);
            $result = $statement->execute(array($leaveId));

            return $statement->fetchAll();
        } catch (Exception $e) {
            throw new DaoException($e->getMessage(), 0, $e);
        }
    }

    /**
     * Get Leave without entitlements sorted by empNumber ASC and leave date ASC
     * 
     * @param mixed $empNumber integer employee number or array of integer employee numbers
     * @param int $leaveTypeId Leave type ID
     * @param string $fromDate From Date
     * @param string $toDate To Date
     * @return array Array containing leave without entitlements. Each element of the array contains the following:
     * 
     * id -> leave id
     * date -> leave date
     * length_hours -> leave length in hours
     * length_days -> leave length in days
     * status -> leave status
     * leave_type_id -> leave type id
     * emp_number -> emp number
     * days_left -> days in leave that are not yet linked to an entitlement
     * 
     * @throws DaoException
     */
    public function getLeaveWithoutEntitlements($empNumber, $leaveTypeId, $fromDate, $toDate) {
        try {
            //print_r("$empNumber, $leaveTypeId, $fromDate, $toDate");
            $statusList = array(Leave::LEAVE_STATUS_LEAVE_REJECTED, Leave::LEAVE_STATUS_LEAVE_CANCELLED,
                Leave::LEAVE_STATUS_LEAVE_WEEKEND, Leave::LEAVE_STATUS_LEAVE_HOLIDAY);

            $params = array();
            
            if (is_array($empNumber)) {
                $questionMarks = str_repeat("?,", count($empNumber) - 1) . "?";    
                $empClause = ' IN (' . $questionMarks . ') ';
                $params = $empNumber;
            } else {
                $empClause = ' = ? ';
                $params[] = $empNumber;
            }
            
            $params = array_merge($params, array($leaveTypeId, $fromDate, $toDate));

            $conn = Doctrine_Manager::connection()->getDbh();
            $query = "select * from (select l.id, l.date, l.length_hours, l.length_days, l.status, l.leave_type_id, l.emp_number, " .
                    "l.length_days - sum(COALESCE(lle.length_days, 0)) as days_left " .
                    "from ohrm_leave l left join ohrm_leave_leave_entitlement lle on lle.leave_id = l.id " .
                    "where l.emp_number " . $empClause . " and l.leave_type_id = ? and l.date >= ? and l.date <= ? and " .
                    "l.status not in (" . implode(',', $statusList) . ") " .
                    "group by l.id order by l.emp_number ASC, l.`date` ASC) as A where days_left > 0";

            $statement = $conn->prepare($query);
            $result = $statement->execute($params);

            return $statement->fetchAll();
        } catch (Exception $e) {
            throw new DaoException($e->getMessage(), 0, $e);
        }
    }

    /**
     * Return any matching entitlements (with identical empNumber, leave type, from and to
     * dates. 
     * 
     * @param int $empNumber Employee Number
     * @param int $leaveTypeId Leave Type ID
     * @param Date $fromDate From Date
     * @param Date $toDate To Date
     * 
     * @return array Array of Entitlement objects. Empty array if no matches
     */
    public function getMatchingEntitlements($empNumber, $leaveTypeId, $fromDate, $toDate) {
        try {
            $params = array(':leaveTypeId' => $leaveTypeId,
                ':empNumber' => $empNumber,
                ':fromDate' => $fromDate,
                ':toDate' => $toDate);

            $q = Doctrine_Query::create()->from('LeaveEntitlement le')
                    ->addWhere('le.deleted = 0')
                    ->addWhere('le.leave_type_id = :leaveTypeId')
                    ->addWhere('le.emp_number = :empNumber')
                    ->addWhere('le.from_date = :fromDate')
                    ->addWhere('le.to_date = :toDate');

            $results = $q->execute($params);
            return $results;
        } catch (Exception $e) {
            throw new DaoException($e->getMessage(), 0, $e);
        }
    }

    /**
     * Save Leave Adjustment and linked to relevent leave entitlement 
     * 
     * @param LeaveAdjustment $leaveAdjustment
     * @return type
     * @throws DaoException
     */
    public function saveLeaveAdjustment(LeaveAdjustment $leaveAdjustment) {
        $conn = Doctrine_Manager::connection();
        $conn->beginTransaction();

        try {
            $leaveAdjustment->save();

            $conn->commit();
            return $leaveAdjustment;
        } catch (Exception $e) {
            $conn->rollback();
            throw new DaoException($e->getMessage(), 0, $e);
        }
    }
    
    /**
     * Get List of LeaveEntitlementTypes
     * 
     * @param string $orderField field to order by
     * @param string $orderBy order (ASC/DESC)
     * @return Collection of LeaveEntitlementType
     * @throws DaoException on an error
     */
    public function getLeaveEntitlementTypeList($orderField = 'name', $orderBy = 'ASC') {
        try {
            $orderBy = (strcasecmp($orderBy, 'DESC') == 0) ? 'DESC' : 'ASC';
            $q = Doctrine_Query::create()->from('LeaveEntitlementType let')
                    ->addOrderBy($orderField . ' ' . $orderBy);
            $results = $q->execute();
            return $results;
        } catch (Exception $e) {
            throw new DaoException($e->getMessage(), 0, $e);
        }        
    }

}