package calculator;

import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import javax.swing.AbstractButton;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class CalcView extends JFrame {
  private static final long serialVersionUID = -8730447125113729547L;

  private JTextField userValueText;
  private JTextField calcText;
  private JButton sumButton;
  private JButton subtractButton;
  private JButton multiplyButton;
  private JButton divideButton;
  private JButton clearButton;

  public CalcView(CalcController controller) {
    super("Simple Calculator");

    this.userValueText = new JTextField(5);

    this.calcText = new JTextField(20);
    this.calcText.setText("0");
    this.calcText.setEditable(false);

    this.sumButton = new JButton("Add");
    this.setCommand(this.sumButton, CalcController.SUM, controller);

    this.subtractButton = new JButton("Subtract");
    this.setCommand(this.subtractButton, CalcController.SUBTRACT, controller);

    this.multiplyButton = new JButton("Multiply");
    this.setCommand(this.multiplyButton, CalcController.MULTIPLY, controller);

    this.divideButton = new JButton("Divide");
    this.setCommand(this.divideButton, CalcController.DIVIDE, controller);

    this.clearButton = new JButton("Clear");
    this.setCommand(this.clearButton, CalcController.CLEAR, controller);

    this.getContentPane().setLayout(new FlowLayout());
    this.add(new JLabel("Calculated Value"));
    this.add(this.calcText);
    this.add(new JLabel("Input"));
    this.add(this.userValueText);
    this.add(this.sumButton);
    this.add(this.subtractButton);
    this.add(this.multiplyButton);
    this.add(this.divideButton);
    this.add(this.clearButton);
    this.pack();

    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }

  /**
   * Get the string value of the user input text field.
   * 
   * @return The string in the user input text field.
   */
  public String getUserValue() {
    return this.userValueText.getText();
  }

  /**
   * Set the string for the user input text field.
   * 
   * @param value
   *          The new value for the user input text field.
   * @pre. value is not null
   */
  public void setUserValue(String value) {
    this.userValueText.setText(value);
  }

  /**
   * Set the string for the calculated value text field.
   * 
   * @param value
   *          The new value for the calculated value text field.
   * @pre. value is not null
   */
  public void setCalcValue(String value) {
    this.calcText.setText(value);
  }

  /**
   * Sets the action listener and command for a button or menu item.
   * 
   * @param button
   *          A button or menu item.
   * @param commandName
   *          The name of the command that the button invokes.
   * @param actionListener
   *          The receiver of the action event.
   */
  private void setCommand(AbstractButton button, String commandName,
      ActionListener actionListener) {
    button.addActionListener(actionListener);
    button.setActionCommand(commandName);
  }

}