- added issue resolution job and libraries for defining how to resolve issues

- added issue inserts (fehlerupdate.php), included them in checksystem
- added getAufenthaltsdauer method to Bisio_model.php
- Add column parameterFuerBehebung to system.tbl_issue

application/libraries/issues/CORE_ZGV_0004.php

@@ -0,0 +1,50 @@
+<?php
+
+if (! defined('BASEPATH')) exit('No direct script access allowed');
+
+/**
+ * ZGV Datum should not be after ZGV master Datum
+ */
+class CORE_ZGV_0004 implements IIssueResolvedChecker
+{
+	public function checkIfIssueIsResolved($params)
+	{
+		if (!isset($params['prestudent_id']) || !is_numeric($params['prestudent_id']))
+			return error('Prestudent Id missing');
+
+		$this->_ci =& get_instance(); // get code igniter instance
+
+		// get zgvdatum of prestudent
+		$this->_ci->load->model('crm/Prestudent_model', 'PrestudentModel');
+
+		$this->_ci->PrestudentModel->addSelect('zgvdatum, zgvmadatum');
+		$prestudentRes = $this->_ci->PrestudentModel->load($params['prestudent_id']);
+
+		if (isError($prestudentRes))
+			return $prestudentRes;
+
+		if (hasData($prestudentRes))
+		{
+			$prestudentData = getData($prestudentRes)[0];
+
+			// get and compare zgvdatum and zgvmadatum
+			$zgvdatum = $prestudentData->zgvdatum;
+
+			if (isEmptyString($zgvdatum))
+				return success(false);
+
+			$zgvmadatum = $prestudentData->zgvmadatum;
+
+			if (isEmptyString($zgvmadatum))
+				return success(false);
+
+			// check if zgvmadatum comes after zgvdatum
+			if ($zgvmadatum < $zgvdatum)
+				return success(false);
+			else
+				return success(true);
+		}
+		else
+			return success(false);
+	}
+}