/* PayrollGUI.java        Authors: Koffman & Wolz
 * Payroll application with a GUI.
 * Uses Employee.
 */
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

public class PayrollGUI extends JFrame 
                        implements ActionListener, ItemListener {
  private JTextField empIDText = new JTextField(10);
  private JTextField hoursText = new JTextField(10);
  private JTextField rateText = new JTextField(10);
  private JCheckBox c1 = new JCheckBox("union member");
  private JRadioButton r1 = new JRadioButton("1.0");
  private JRadioButton r2 = new JRadioButton("1.5");
  private JRadioButton r3 = new JRadioButton("2.0");
  private JTextArea output = new JTextArea(8, 30);
  private JButton viewData = new JButton("view data");
  private JButton addPayroll = new JButton("add to payroll");
  private JButton clearPayroll = new JButton("clear payroll");
  private double payroll;   // accumulating payroll amount
  NewEmployee programmer = new NewEmployee();

  // Creates the initial payroll GUI
  public PayrollGUI() {
    // Define the layout manager for the frame.
    getContentPane().setLayout(new FlowLayout());

    // Fill idPanel and add it to frame.
    JPanel dataPanel = new JPanel();
    dataPanel.setLayout(new BoxLayout(dataPanel, BoxLayout.Y_AXIS));
    JPanel idPanel = new JPanel();
    JLabel askEmpID = new JLabel("employee id >>");
    idPanel.add(askEmpID);
    idPanel.add(empIDText);
    dataPanel.add(idPanel);

    // Fill hoursPanel and add it to frame.
    JPanel hoursPanel = new JPanel();
    JLabel askHours = new JLabel("hours worked >>");
    hoursPanel.add(askHours);
    hoursPanel.add(hoursText);
    dataPanel.add(hoursPanel);

    // Fill ratePanel and add it to frame.
    JPanel ratePanel = new JPanel();
    JLabel askRate = new JLabel("hourly rate >>");
    ratePanel.add(askRate);
    ratePanel.add(rateText);
    dataPanel.add(ratePanel);

    // Fill unionPanel and add it to dataPanel.
    JPanel unionPanel = new JPanel();
    unionPanel.add(c1);
    dataPanel.add(unionPanel);
    getContentPane().add(dataPanel);

    // Fill overtimePanel and add it to frame.
    JPanel overtimePanel = new JPanel();
    overtimePanel.add(r1);
    overtimePanel.add(r2);
    overtimePanel.add(r3);
    overtimePanel.setBorder(
       BorderFactory.createTitledBorder("Select overtime rate"));
    getContentPane().add(overtimePanel);

    // Add each radio button to buttonGroup rates.
    ButtonGroup rates = new ButtonGroup();
    rates.add(r1);
    rates.add(r2);
    rates.add(r3);

    // Fill buttonPanel and add it to frame.
    JPanel buttonPanel = new JPanel();
    buttonPanel.add(viewData);
    buttonPanel.add(addPayroll);
    buttonPanel.add(clearPayroll);
    getContentPane().add(buttonPanel);

    // Add output text area to Frame().
    getContentPane().add(output);

    // Register applet as listener for action events
    //   on all buttons.
    viewData.addActionListener(this);
    addPayroll.addActionListener(this);
    clearPayroll.addActionListener(this);
    r1.addActionListener(this);
    r2.addActionListener(this);
    r3.addActionListener(this);

    // Register applet as listener for item events
    //   on checkbox
    c1.addItemListener(this);
  }

  public void actionPerformed(ActionEvent aE) {
    String empID;
    String hoursStr;
    String rateStr;
    double hours;
    double rate;
    double overtimeRate;

    Object buttonPressed = aE.getSource();
    if (buttonPressed == viewData) {
       // Get data.
       empID = empIDText.getText();
       hoursStr = hoursText.getText();
       hours = Double.parseDouble(hoursStr);
       rateStr = rateText.getText();
       rate = Double.parseDouble(rateStr);

       // Store data in programmer.
       programmer.setPayData(empID, hours, rate);
       output.setText(programmer.toString() + "\n" +
          "Press 'Add to payroll' to process employee data\n");
    }
    else if (buttonPressed == addPayroll) {
       // Get data.
       empID = empIDText.getText();
       hoursStr = hoursText.getText().trim();
       hours = Double.parseDouble(hoursStr);
       rateStr = rateText.getText().trim();
       rate = Double.parseDouble(rateStr);

       // Store data and compute gross pay.
       programmer.setPayData(empID, hours, rate);
       double gross = programmer.computeGross();

       // Compute net pay, given gross pay.
       double net = programmer.computeNet(gross);

       // Add gross pay to payroll
       payroll = payroll + gross;

       // Display pay amounts and payroll so far.
       output.setText(programmer.toString() +
                      "Gross pay is $" + gross +
                      "\nNet pay is $" + net +
                      "\n\nTotal gross payroll is $" + payroll);
       empIDText.setText("");
       rateText.setText("");
       hoursText.setText("");
    }
    else if (buttonPressed == clearPayroll) {
       // Clear payroll
       output.setText("Final gross payroll is $" + payroll +
                      "\nGross payroll reset to 0");
       payroll = 0;
       empIDText.setText("");
       rateText.setText("");
       hoursText.setText("");
    }
    else if (r1.isSelected()) {
       overtimeRate = Double.parseDouble(r1.getText());
       programmer.setOvertimeRate(overtimeRate);
    }
    else if (r2.isSelected()) {
       overtimeRate = Double.parseDouble(r2.getText());
       programmer.setOvertimeRate(overtimeRate);
    }
    else if (r3.isSelected()) {
       overtimeRate = Double.parseDouble(r3.getText());
       programmer.setOvertimeRate(overtimeRate);
    }
  }  // end actionPerformed()

  public void itemStateChanged(ItemEvent iE) {
    Object choice = iE.getItemSelectable();
    if (choice == c1)
       programmer.setInUnion(c1.isSelected());
  }

  // Creates the frame and closes the frame.
  public static void main(String[] args) {
    PayrollGUI pay = new PayrollGUI();
    pay.setSize(350, 430);
    pay.setVisible(true);
    pay.setTitle("Payroll with GUI");
    pay.addWindowListener(
        new WindowAdapter() {
           public void windowClosing(WindowEvent e) {
              System.exit(0);
           }
        }
    );
  }
}