import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.event.EventHandler;
import javafx.event.ActionEvent;
import javafx.geometry.Pos;

public class Kalkulator extends Application {

    // trenger tilgang til disse i KnappBehandler
    TextField tall1, tall2; // tallene
    TextField resultat; // svaret

    @Override
    public void start(Stage teater) {
        VBox kulisser = new VBox();
        kulisser.setAlignment(Pos.CENTER);

        HBox knappeBoks = new HBox();
        knappeBoks.setAlignment(Pos.CENTER);

        tall1 = new TextField("tall1");
        tall2 = new TextField("tall2");
        resultat = new TextField("resultat");
        Text erLik = new Text(" = ");

        Button pluss = new Button("+");
        Button minus = new Button("-");
        Button gange = new Button("*");
        Button dele = new Button("/");

        KnappBehandler handling = new KnappBehandler();
        pluss.setOnAction(handling);
        minus.setOnAction(handling);
        gange.setOnAction(handling);
        dele.setOnAction(handling);

        knappeBoks.getChildren().addAll(pluss, minus, gange, dele);

        kulisser.getChildren().addAll(tall1, knappeBoks, tall2, erLik, resultat);

        teater.setTitle("Kalkulator");
        teater.setScene(new Scene(kulisser, 250, 150));
        teater.show();
    }

    // indre klasse - handling som skal skje naar vi trykker paa knappene
    class KnappBehandler implements EventHandler<ActionEvent> {
        @Override
        public void handle(ActionEvent e) {
            Button trykket = (Button) e.getSource();
            String knappeTekst = trykket.getText();
            double tallInn1 = 0.0;
            double tallInn2 = 0.0;
            try {
                tallInn1 = Double.parseDouble(tall1.getText()); // leser inn tall
                tallInn2 = Double.parseDouble(tall2.getText()); // leser inn tall
            } catch (NumberFormatException eksept) {
                System.out.println("Ikke tall");
                return;
            }
            if (knappeTekst.equals("+")) {
                resultat.setText(" " + (tallInn1 + tallInn2));
            } else if (knappeTekst.equals("-")) {
                resultat.setText(" " + (tallInn1 - tallInn2));
            } else if (knappeTekst.equals("*")) {
                resultat.setText(" " + tallInn1*tallInn2);
            } else if (knappeTekst.equals("/")) {
                if (tallInn2 != 0) {
                    resultat.setText(" " + tallInn1/tallInn2);
                } else {
                    System.out.println("Kan ikke dele p? 0");
                }
            }
        }
    }



}