package zeichnen_02_Expo;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.LayoutManager;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

public class JFramePaintFunktionQuadNullstellen extends JFrame {

	private JPanel contentPane;
	private Font f1 = new Font("Comic Sans MS", Font.BOLD, 20);
	private boolean jButtonZeichneIsSelected = false;
	private boolean jButtonEFunktionIsSelected = false;
	private JPanel panel;
	private JButton jButtonZeichne;
	private JTextField textField_a;
	private JTextField textField_b;
	private JTextField textField_c;
	private JLabel labelA;
	private JLabel labelB;
	private JLabel labelC;
	private double a;
	private double b;
	private double c;
	private int key1;
	private int key2;
	private JButton jButtonEFunktion;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					JFramePaintFunktionQuadNullstellen frame = new JFramePaintFunktionQuadNullstellen();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public JFramePaintFunktionQuadNullstellen() {
		initGUI();
	}
	private void initGUI() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 600, 500);
		contentPane = new JPanel();
		contentPane.setBackground(Color.YELLOW);
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		contentPane.setLayout(null);
		{
			panel = new JPanel();
			panel.setBounds(0, 427, 546, 35);
			contentPane.add(panel);
			panel.setLayout(null);
			{
				jButtonZeichne = new JButton("Zeichnen");
				jButtonZeichne.addKeyListener(new KeyAdapter() {
					@Override
					public void keyPressed(KeyEvent e) {
						do_jButtonZeichne_keyPressed(e);
					}
					@Override
					public void keyReleased(KeyEvent e) {
						do_jButtonZeichne_keyReleased(e);
					}
				});
				jButtonZeichne.addActionListener(new ActionListener() {
					public void actionPerformed(ActionEvent e) {
						do_jButtonZeichne_actionPerformed(e);
					}
				});
				jButtonZeichne.setBounds(368, 0, 89, 37);
				panel.add(jButtonZeichne);
			}
			{
				textField_a = new JTextField();
				textField_a.setBounds(38, 0, 40, 34);
				panel.add(textField_a);
				textField_a.setColumns(10);
			}
			{
				textField_b = new JTextField();
				textField_b.setColumns(10);
				textField_b.setBounds(147, 0, 42, 34);
				panel.add(textField_b);
			}
			{
				textField_c = new JTextField();
				textField_c.setColumns(10);
				textField_c.setBounds(259, 0, 38, 34);
				panel.add(textField_c);
			}
			{
				labelA = new JLabel("a=");
				labelA.setBounds(0, 11, 46, 14);
				panel.add(labelA);
			}
			{
				labelB = new JLabel("b=");
				labelB.setBounds(91, 11, 46, 14);
				panel.add(labelB);
			}
			{
				labelC = new JLabel("c=");
				labelC.setBounds(199, 11, 46, 14);
				panel.add(labelC);
			}
			{
				jButtonEFunktion = new JButton("E-Zeichnen");
				jButtonEFunktion.addActionListener(new ActionListener() {
					public void actionPerformed(ActionEvent e) {
						do_jButtonEFunktion_actionPerformed(e);
					}
				});
				jButtonEFunktion.setBounds(457, 0, 89, 37);
				panel.add(jButtonEFunktion);
			}
		}
	}

	public void paint(Graphics g) {
		super.paintComponents(g);
		int sizeX = this.getWidth();
		int sizeY = this.getHeight();

		// oben links soll Name stehen
		g.setColor(Color.green);
		g.setFont(f1);
		g.drawString(" Hallo ", 50, 70);

		// Koordinatensystem erstellen
		KoordinatenSystem koord = new KoordinatenSystem(g, sizeX, sizeY);
		if (this.jButtonZeichneIsSelected)
		{
			if(setKooeffizienten()) {
				koord.paintGanzrationaleFunktion(g, sizeX, sizeY, a, b, c);
			} else {
				JOptionPane.showMessageDialog(null, "Ungültige Eingabe", "Fehlermeldung", JOptionPane.ERROR_MESSAGE);
			}
		}
		else if (this.jButtonEFunktionIsSelected) {
			{
				koord.paintExpoFunktion(g, sizeX, sizeY);
			}
		}
		jButtonEFunktionIsSelected = false;
		jButtonZeichneIsSelected = false;
	}
	protected void do_jButtonZeichne_actionPerformed(ActionEvent e) {
		jButtonZeichneIsSelected = true;
		this.repaint();
	}
	private boolean setKooeffizienten() {
		// Parameter initialisieren
		this.a = 0;
		this.b = 0;
		this.c = 0;
		String strA = textField_a.getText();
		String strB = textField_b.getText();
		String strC = textField_c.getText();
		try {
			if (strA.isEmpty() != true) {
				this.a = Double.parseDouble(textField_a.getText().replace(',', '.'));
			}
			if (strB.isEmpty() != true) {
				this.b = Double.parseDouble(textField_b.getText().replace(',', '.'));
			}
			if (strC.isEmpty() != true)
			{ this.c = Double.parseDouble(textField_c.getText().replace(',', '.'));
			}
			return true;
		}
		catch (NumberFormatException e) {
			return false;
		}
	}
	protected void do_jButtonZeichne_keyPressed(KeyEvent e) {


		if(e.getKeyCode() != KeyEvent.VK_Z) {
			key1 = e.getKeyCode();
		} else {
			key2 = e.getKeyCode();
		}
		if(key1 == KeyEvent.VK_ALT && key2 == KeyEvent.VK_Z) {
			jButtonZeichneIsSelected = true;
			this.repaint();
		}

	}
	protected void do_jButtonZeichne_keyReleased(KeyEvent e) {
		key1 = 0;
		key2 = 0;
	}
	protected void do_jButtonEFunktion_actionPerformed(ActionEvent e) {
		jButtonEFunktionIsSelected = true;
		repaint();
	}
}