package benutzerschnittstelle;

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

import fachkonzept.Person;

import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
import java.awt.event.ActionEvent;

public class GUI extends JFrame
{

	private JPanel contentPane;
	private JLabel lblGewicht;
	private JTextField txtGewicht;
	private JLabel lblKg;
	private JLabel lblGre;
	private JTextField txtGroesse;
	private JLabel lblM;
	private JLabel lblBmi;
	private JTextField txtBmi;
	private JTextField txtGewichtsklasse;
	private JButton btnBmiBerechnen;
	private JButton btnLschen;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args)
	{
		try
		{
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
		}
		catch (Exception e)
		{
			System.out.println(e.getLocalizedMessage());
		}
		EventQueue.invokeLater(new Runnable()
		{
			public void run()
			{
				try
				{
					GUI frame = new GUI();
					frame.setVisible(true);
				}
				catch (Exception e)
				{
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public GUI()
	{
		setResizable(false);
		setTitle("BMI-Rechner");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 277, 305);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);

		lblGewicht = new JLabel("Gewicht");
		lblGewicht.setBounds(10, 22, 46, 13);
		contentPane.add(lblGewicht);

		txtGewicht = new JTextField();
		txtGewicht.setBounds(64, 19, 96, 19);
		contentPane.add(txtGewicht);
		txtGewicht.setColumns(10);

		lblKg = new JLabel("kg");
		lblKg.setBounds(170, 22, 46, 13);
		contentPane.add(lblKg);

		lblGre = new JLabel("Gr\u00F6\u00DFe");
		lblGre.setBounds(10, 45, 46, 13);
		contentPane.add(lblGre);

		txtGroesse = new JTextField();
		txtGroesse.setBounds(64, 42, 96, 19);
		contentPane.add(txtGroesse);
		txtGroesse.setColumns(10);

		lblM = new JLabel("m");
		lblM.setBounds(170, 45, 46, 13);
		contentPane.add(lblM);

		lblBmi = new JLabel("BMI");
		lblBmi.setBounds(10, 70, 46, 13);
		contentPane.add(lblBmi);

		txtBmi = new JTextField();
		txtBmi.setEditable(false);
		txtBmi.setBounds(64, 67, 130, 19);
		contentPane.add(txtBmi);
		txtBmi.setColumns(10);

		txtGewichtsklasse = new JTextField();
		txtGewichtsklasse.setEditable(false);
		txtGewichtsklasse.setBounds(64, 96, 130, 19);
		contentPane.add(txtGewichtsklasse);
		txtGewichtsklasse.setColumns(10);

		btnBmiBerechnen = new JButton("BMI berechnen");
		btnBmiBerechnen.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				geklicktBMIBerechnen();
			}
		});
		btnBmiBerechnen.setBounds(10, 129, 243, 21);
		contentPane.add(btnBmiBerechnen);

		btnLschen = new JButton("l\u00F6schen");
		btnLschen.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				geklicktLoeschen();
			}
		});
		btnLschen.setBounds(10, 160, 243, 21);
		contentPane.add(btnLschen);
	}

	private void geklicktLoeschen()
	{
		txtGewicht.setText(null);
		txtGroesse.setText(null);
		txtBmi.setText(null);
		txtGewichtsklasse.setText(null);
	}

	private void geklicktBMIBerechnen()
	{
		int gew = 1;
		try
		{
			gew = Integer.parseInt(txtGewicht.getText());
		}
		catch (NumberFormatException nfe)
		{
			JOptionPane.showMessageDialog(this, "Nur ganze Zahlen zulässig!", "Gewicht", JOptionPane.ERROR_MESSAGE);
			txtGewicht.selectAll();
			txtGewicht.requestFocus();
			return;
		}

		double gr = 1;
		try
		{
			gr = Double.parseDouble(txtGroesse.getText());
		}
		catch (NumberFormatException nfe)
		{
			JOptionPane.showMessageDialog(this, "Nur Dezimalzahlen zulässig!", "Größe", JOptionPane.ERROR_MESSAGE);
			txtGroesse.selectAll();
			txtGroesse.requestFocus();
			return;
		}

		Person diePerson = null;
		try
		{
			diePerson = new Person(gew, gr);
		}
		catch (Exception e)
		{
			JOptionPane.showMessageDialog(this, "ungültige Eingabe!");
		}
		double bmi = diePerson.berechneBMI();
		DecimalFormat df = new DecimalFormat("0.00");
		txtBmi.setText(df.format(bmi));
		String gewKlasse = diePerson.setzeGewichtsklasse();
		txtGewichtsklasse.setText(gewKlasse);

	}
}