import java.util.*;


public class EmployeeManager {


  private Hashtable employees;


  public EmployeeManager() {

    employees = new Hashtable();
  }


  public void addEmployee(Payable p) throws Exception {

    if (employees.containsKey(p.getName())) {
      throw new Exception("An employee by this name (" + p.getName() + ") already exists");
    } else {
      employees.put(p.getName(), p);
    }
  }


  public void payEmployee(String name, double hoursWorked, float payRate) throws Exception {

    if (!employees.containsKey(name)) {
      throw new Exception("An employee by name " + name + " does not exist and cannot be paid");
    } else {
      try {
        Payable p = (Payable)employees.get(name);
        p.setPayRate(payRate);
        double paid = p.addHoursWorked(hoursWorked);
        System.out.println("Employee " + p.getName() + " has been paid: $" + paid);
      } catch (Exception e) {
        System.out.println(e.getMessage());
      }
    }
  }


  public void payEmployee(String name, double hoursWorked) throws Exception {

    if (!employees.containsKey(name)) {
      throw new Exception("An employee by name " + name + " does not exist and cannot be paid");
    } else {
      try {
        Payable p = (Payable)employees.get(name);
        double paid = p.addHoursWorked(hoursWorked);
        System.out.println("Employee " + p.getName() + " has been paid: $" + paid);
      } catch (Exception e) {
        System.out.println(e.getMessage());
      }
    }
  }


  public void printAll() {

    for (Enumeration e = employees.keys(); e.hasMoreElements(); ) {
      Payable p = (Payable)employees.get(e.nextElement());
      System.out.println(p);
      p.printAccount();
    }
  }
}