package com.example.spring.ui;

import java.awt.GridLayout;
import java.awt.HeadlessException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

import com.example.spring.logic.Maths;


public class MyAppFrame extends JFrame implements ActionListener {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	
	private JButton button;
	private JTextField textFiledA;
	private JTextField textFiledB;
	private JLabel answerPanel;
	
	private Maths maths;
	
	public void setMaths(Maths maths) {
		this.maths = maths;
	}
	
	public MyAppFrame() throws HeadlessException {
		super("MyCalc");
		
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		
		textFiledA = new JTextField();
		textFiledA.setHorizontalAlignment(JTextField.RIGHT);
		textFiledB = new JTextField();
		textFiledB.setHorizontalAlignment(JTextField.RIGHT);
		button = new JButton("Add");
		answerPanel = new JLabel();

		setLayout(new GridLayout(2, 2));
		
		JPanel inputPanel = new JPanel();
		inputPanel.setLayout(new GridLayout(2, 2));
		
		inputPanel.add(new JLabel("a:"));
		inputPanel.add(textFiledA);
		inputPanel.add(new JLabel("b:"));
		inputPanel.add(textFiledB);
		
		add(inputPanel);
		
		
		JPanel bottomSection = new JPanel();
		bottomSection.setLayout(new GridLayout(2, 1));

		bottomSection.add(button);
		bottomSection.add(answerPanel);

		add(bottomSection);
		
		
		button.addActionListener(this);
		
		setSize(200, 300);
		setVisible(true);
	}

	@Override
	public void actionPerformed(ActionEvent e) {
		double a, b;
		
		try {
			a = Double.parseDouble(textFiledA.getText());
		} catch (NumberFormatException nfe) {
			answerPanel.setText("Value of \"a\" is invalid.");
			return;
		}
		
		try {
			b = Double.parseDouble(textFiledB.getText());
		} catch (NumberFormatException nfe) {
			answerPanel.setText("Value of \"b\" is invalid.");
			return;
		}
		
		double results = maths.add(a, b);
		answerPanel.setText("Answer: " + results);
	}
}