package corseworkerino;


import java.io.IOException;
import java.util.function.Consumer;

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.RadioButton;
import javafx.scene.control.TextField;
import javafx.scene.control.Toggle;
import javafx.scene.control.ToggleGroup;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

public class CalcView extends Application implements ViewInterface {

      @FXML
      // fx:id="calcButton"
      private Button calcButton; // Value injected by FXMLLoader

      @FXML
      // fx:id="infixButton"
      private RadioButton infixButton; // Value injected by FXMLLoader

      @FXML
      // fx:id="type"
      private ToggleGroup type; // Value injected by FXMLLoader

      @FXML
      // fx:id="postfixButton"
      private RadioButton postfixButton; // Value injected by FXMLLoader

      @FXML
      // fx:id="question"
      private TextField question; // Value injected by FXMLLoader

      @FXML
      // fx:id="answer"
      private Label answer; // Value injected by FXMLLoader
      /////////////////////////////////////////////////////////////////////////////////
      // Block for creating an instance variable for others to use.
      //
      // Make it a JavaFX singleton.  Instance is set by the javafx "initialize" method
      private volatile static CalcView instance = null;

      @FXML
      void initialize() {
        instance = this;
      }

      public synchronized static CalcView getInstance() {
        if (instance == null) {
          new Thread(() -> Application.launch(CalcView.class)).start();
          // Wait until the instance is ready since initialize has executed.
          while (instance == null) {// empty body
          }
        }

        return instance;
      }
      // End of special block
      /////////////////////////////////////////////////////////////////////////////////

      @Override
      public void start(Stage primaryStage) throws IOException {
        GridPane page = (GridPane) FXMLLoader.load(CalcView.class
            .getResource("CalcView.fxml"));
        Scene scene = new Scene(page);
        scene.getStylesheets().add(
            getClass().getResource("application.css").toExternalForm());
        primaryStage.setScene(scene);
        primaryStage.setTitle("MVC with JavaFX and FXML");
        primaryStage.show();
      }




    @Override
    public void addCalcObserver(Observer f) {
        calcButton.setOnAction(event -> f.tell());

    }

    @Override
    public void addTypeObserver(Observer f) {
        infixButton.setOnAction(event -> f.tell());
        postfixButton.setOnAction(event -> f.tell());

    }
    @Override
    public OpType getType() {
        if (postfixButton.isSelected()) {
            return OpType.POSTFIX;

        }else {
            return OpType.INFIX;
        }
    }

    @Override
    public String getQuestion() {
        return question.getText();
    }

    @Override
    public void setAnswer(String a) {

                answer.setText(a);

    }
}