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package mobileapplication1;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
import javax.microedition.lcdui.TextField;
import javax.microedition.lcdui.Ticker;
import javax.microedition.midlet.*;

public class Midlet extends MIDlet implements CommandListener {
	private final Form okno;
	private final TextField tfa;
	private final TextField tfb;
	private final TextField tfc;
	private final Command cmdWylicz;
	private final Command cmdKoniec;
	private final Ticker komunikat;
	private final StringItem tfDelta;
	private final StringItem tfWynik;

	public Midlet() {
		okno = new Form("Wyliczanie pierwiastka");
		tfa = new TextField("Podaj a:", "1", 6, TextField.ANY);
		tfb = new TextField("Podaj b:", "1", 6, TextField.ANY);
		tfc = new TextField("Podaj c:", "1", 6, TextField.ANY);
		tfDelta = new StringItem("Delta:", "");
		tfWynik = new StringItem("Wynik:", "");
		komunikat = new Ticker("Wyliczanie równań kwadratowych");
		cmdWylicz = new Command("Wylicz", Command.ITEM, 0);
		cmdKoniec = new Command("Koniec", Command.ITEM, 1);
		okno.append(tfa);
		okno.append(tfb);
		okno.append(tfc);
		okno.append(tfDelta);
		okno.append(tfWynik);
		okno.setTicker(komunikat);
	}

	public void startApp() {
		Display ekran = Display.getDisplay(this);
		ekran.setCurrent(okno);
		okno.addCommand(cmdWylicz);
		okno.addCommand(cmdKoniec);
		okno.setCommandListener(this);
	}

	public void pauseApp() {
	}

	public void destroyApp(boolean unconditional) {
	}

	public void commandAction(Command cmd, Displayable d) {
		if (cmd == cmdWylicz) {
			try {
				double a = Double.parseDouble(tfa.getString());
				double b = Double.parseDouble(tfb.getString());
				double c = Double.parseDouble(tfc.getString());
				double x1;
				double x2;
				double pierwiastek;
				if (a == 0.0) {
					tfDelta.setText("Równanie nie jest kwadratowe");
					return;
				}
				double delta = (b * b) - (4.0 * a * c);
				tfDelta.setText(delta + "");
				if (delta > 0) {
					pierwiastek = Math.sqrt(delta);
					x1 = ((-b) - pierwiastek) / (2.0 * a);
					x2 = ((-b) + pierwiastek) / (2.0 * a);
					tfWynik.setText("X1=" + x1 + "; X2=" + x2);
				} else if (delta == 0) {
					x1 = (-b) / (2.0 * a);
					tfWynik.setText("X=" + x1);
				} else {
					tfWynik.setText("Brak rozwiązania");
				}
			} catch (NumberFormatException exc) {
				tfDelta.setText("NumberFormatExc");
			} catch (IllegalArgumentException exi) {
				tfDelta.setText("IllegalArgExc");
			}
		}
		if (cmd == cmdKoniec) {
			destroyApp(false);
			notifyDestroyed();
		}
	}
}