Implement View Payslip History

<UserStory> EMP011 : View Payslip History </UserStory>

<Changes>
 - Implemented Enums::Month enum and helper functions getMonth() and getMonthString() for month formatting.
 - Created viewPayslipHistory() helper in MenuHelper.h to display payslip history in aligned tabular format.
 - Integrated viewPayslipHistory() option into EmployeeMenu, FinanceExecutiveMenu, HRManagerMenu, ITExecutiveMenu, TalentExecutiveMenu, TeamExecutiveMenu, and TeamLeadMenu.
</Changes>

<Review>
  Smitha Mohan
</Review>

Trenser.Zenvy/Trenser.Zenvy/views/EmployeeMenu.cpp

@@ -33,17 +33,16 @@ bool EmployeeMenu::handleOperation(int choice)
 {
 	switch (choice)
 	{
-	/*
-	case 1:
+	/*case 1:
 		m_zenvyController.applyLeave();
 		break;
 	case 2:
 		m_zenvyController.viewPayslip();
-		break;
+		break;*/
 	case 3:
-		m_zenvyController.viewPayslipHistory();
+		viewPayslipHistory(m_zenvyController);
 		break;
-	case 4 :
+	/*case 4 :
 		m_zenvyController.raiseTicket();
 		break;
 	case 5 :

Trenser.Zenvy/Trenser.Zenvy/views/FinanceExecutiveMenu.cpp

@@ -65,6 +65,9 @@ bool FinanceExecutiveMenu::handleOperation(int choice)
 {
 	switch (choice)
 	{
+	case 3:
+		viewPayslipHistory(m_zenvyController);
+		break;
 	case 4:
 		viewEmployees(m_zenvyController);
 		break;

Trenser.Zenvy/Trenser.Zenvy/views/HRManagerMenu.cpp

@@ -32,6 +32,9 @@ bool HRManagerMenu::handleOperation(int choice)
 {
 	switch (choice)
 	{
+	case 3:
+		viewPayslipHistory(m_zenvyController);
+		break;
 	case 4:
 		viewEmployees(m_zenvyController);
 		break;

Trenser.Zenvy/Trenser.Zenvy/views/ITExecutiveMenu.cpp

@@ -32,6 +32,9 @@ bool ITExecutiveMenu::handleOperation(int choice)
 {
 	switch (choice)
 	{
+	case 3:
+		viewPayslipHistory(m_zenvyController);
+		break;
 	case 4:
 		viewEmployees(m_zenvyController);
 		break;

Trenser.Zenvy/Trenser.Zenvy/views/MenuHelper.h

@@ -2,7 +2,9 @@
 #include <map>
 #include <memory>
 #include <vector>
+#include <string>
 #include <iostream>
+#include <sstream>
 #include <iomanip>
 #include <utility>
 #include "Enums.h"
@@ -15,6 +17,33 @@
 
 void createEmployee(std::shared_ptr<ZenvyController> controller);
 
+inline void viewPayslipHistory(std::shared_ptr<ZenvyController> controller)
+{
+    auto employeePayslips = controller->getCurrentEmployee()->getEmployeePayslips();
+    util::clear();
+    std::cout << "Payslips\n" << std::endl;
+    std::cout << std::left
+        << std::setw(15) << "Date"
+        << std::setw(15) << "Payslip ID"
+        << std::setw(15) << "Employee ID"
+        << std::setw(12) << "Salary"
+        << std::setw(25) << "TimeStamp"
+        << std::endl;
+    for (const auto& payslip : employeePayslips) 
+    {
+        std::ostringstream dateStream;
+        dateStream << payslip.second->getTimestamp().getYear() << " - " << Enums::getMonthString(Enums::getMonth(payslip.second->getTimestamp().getMonth()));
+        std::cout << std::left
+            << std::setw(15) << dateStream.str()
+            << std::setw(15) << payslip.first
+            << std::setw(15) << payslip.second->getEmployeeId()
+            << std::setw(12) << payslip.second->getSalary()
+            << std::setw(25) << payslip.second->getTimestamp().toString()
+            << std::endl;
+    }
+    util::pressEnter();
+}
+
 inline void viewProfile(std::shared_ptr<ZenvyController> controller) 
 {
     util::clear();

Trenser.Zenvy/Trenser.Zenvy/views/TalentExecutiveMenu.cpp

@@ -32,6 +32,9 @@ bool TalentExecutiveMenu::handleOperation(int choice)
 {
 	switch (choice)
 	{
+	case 3:
+		viewPayslipHistory(m_zenvyController);
+		break;
 	case 4:
 		viewEmployees(m_zenvyController);
 		break;

Trenser.Zenvy/Trenser.Zenvy/views/TeamExecutiveMenu.cpp

@@ -32,6 +32,9 @@ bool TeamExecutiveMenu::handleOperation(int choice)
 {
 	switch (choice)
 	{
+	case 3:
+		viewPayslipHistory(m_zenvyController);
+		break;
 	case 4:
 		viewEmployees(m_zenvyController);
 		break;

Trenser.Zenvy/Trenser.Zenvy/views/TeamLeadMenu.cpp

@@ -32,6 +32,9 @@ bool TeamLeadMenu::handleOperation(int choice)
 {
 	switch (choice)
 	{
+	case 3:
+		viewPayslipHistory(m_zenvyController);
+		break;
 	case 7:
 		viewEmployees(m_zenvyController);
 		break;