// UserInterface.cpp
  
  include <iostream>
  include <stdexcept>
  include <string>
  
  include <Database.h>
  
  using namespace std;
  using namespace Records;
  
  int displayMenu();
  void doHire(Database& inDB);
  void doFire(Database& inDB);
  void doPromote(Database& inDB);
  void doDemote(Database& inDB);
  
  int main(int argc, char** argv)
  {
    Database employeeDB;
    bool done = false;
  
    while (!done) {
      int selection = displayMenu();
  
      switch (selection) {
      case 1:
        doHire(employeeDB);
        break;
      case 2:
        doFire(employeeDB);
        break;
      case 3:
        doPromote(employeeDB);
        break;
      case 4:
        employeeDB.displayAll();
        break;
      case 5:
        employeeDB.displayCurrent();
        break;
      case 6:
        employeeDB.displayFormer();
        break;
      case 0:
        done = true;
        break;
      default:
        cerr << "Unknown command." << endl;
      }
    }
  }
  
  int displayMenu()
  {
    int selection;
  
    cout << endl;
    cout << "Employee Database" << endl;
    cout << "-----------------" << endl;
    cout << "1) Hire a new employee" << endl;
    cout << "2) Fire an employee" << endl;
    cout << "3) Promote an employee" << endl;
    cout << "4) List all employees" << endl;
    cout << "5) List all current employees" << endl;
    cout << "6) List all previous employees" << endl;
    cout << "0) Quit" << endl;
    cout << endl;
    cout << "---> ";
  
    cin >> selection;
  
    return selection;
  }
  
  void doHire(Database& inDB)
  {
    string firstName;
    string lastName;
  
    cout << "First name? ";
    cin >> firstName;
    cout << "Last name? ";
    cin >> lastName;
  
    try {
      inDB.addEmployee(firstName, lastName);
    } catch (std::exception ex) { 
      cerr << "Unable to add new employee!" << endl;
    }
  }
  
  void doFire(Database& inDB)
  {
    int employeeNumber;
  
    cout << "Employee number? ";
    cin >> employeeNumber;
  
    try {
      Employee& emp = inDB.getEmployee(employeeNumber);
      emp.fire();
      cout << "Employee " << employeeNumber << " has been terminated." << endl;
    } catch (std::exception ex) {
      cerr << "Unable to terminate employee!" << endl;
    }
  }
  
  void doPromote(Database& inDB)
  {
    int employeeNumber;
    int raiseAmount;
  
    cout << "Employee number? ";
    cin >> employeeNumber;
  
    cout << "How much of a raise? ";
    cin >> raiseAmount;
  
    try {
      Employee& emp = inDB.getEmployee(employeeNumber);
      emp.promote(raiseAmount);
    } catch (...) {
      cerr << "Unable to promote employee!" << endl;
    }
  }