import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Collections;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Puzzle extends Application {


    Button reset, btns[][], tmps[];
    int br;


    @Override
    public void start(Stage stage) {
        StackPane container = makeContainer();

        Scene s = new Scene(container);
        stage.setScene(s);
        stage.setTitle("Puzzle");
        stage.setResizable(false);
        stage.sizeToScene();
        stage.show();
    }

    private StackPane makeContainer() {
        tmps = new Button[2];
        br = 0;
        StackPane sp = new StackPane();
        sp.getChildren().add(makeBackground());
        sp.getChildren().add(makeButtons());
        return sp;
    }

    private ImageView makeBackground() {
        ImageView iv = new ImageView();
        FileInputStream path;
        try {
            path = new FileInputStream("pineapple.png");
            Image img = new Image(path);
            iv.setImage(img);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return iv;
    }

    @SuppressWarnings("static-access")
    private BorderPane makeButtons() {
        BorderPane bp = new BorderPane();
        reset = new Button("Reset");
        reset.setOnAction(this::reseting);
        bp.setTop(reset);
        bp.setMargin(reset, new Insets(15,5,30,5));
        bp.setCenter(makeCenter());
        return bp;
    }

    @SuppressWarnings("static-access")
    private GridPane makeCenter() {
        GridPane gp = new GridPane();
        btns = new Button[4][4];
        for(int i = 0; i < 4; i++) {
            for(int j = 0; j < 4; j++) {
                btns[i][j] = new Button();
                btns[i][j].setPrefSize(97, 97);
                btns[i][j].setOnAction(this::clicked);
                gp.setMargin(btns[i][j], new Insets(5));
                gp.add(btns[i][j], i, j);
            }
        }
        setText();
        return gp;
    }

    private void setText() {
        ArrayList<Integer> list = new ArrayList<>();
        for(int i = 1; i < 9; i++) {
            list.add(i);
            list.add(i);
        }
        Collections.shuffle(list);
        int br = 0;
        for(int i = 0; i < 4; i++) {
            for(int j = 0; j < 4; j++) {
                btns[i][j].setVisible(true);
                btns[i][j].setText(list.get(br++).toString());
            }
        }
    }

    private void clicked(ActionEvent e) {
        if(br++ % 2 == 0) {
            tmps[0] = (Button) e.getSource();
        } else {
            tmps[1] = (Button) e.getSource();
            if(tmps[0].getText().equals(tmps[1].getText()) && tmps[0]!=tmps[1]) {
                tmps[0].setVisible(false);
                tmps[1].setVisible(false);
                if(isFinish()) showMessage();
            }

        }
    }

    private void reseting(ActionEvent e) {
        br = 0;
        setText();
    }

    private boolean isFinish() {
        for(int i = 0; i < 4; i++) {
            for(int j = 0; j < 4; j++) {
                if(btns[i][j].isVisible()) return false;
            }
        }
        return true;
    }

    private void showMessage() {
        Alert a = new Alert(Alert.AlertType.INFORMATION, "You finished this game with "
                + br + " trys.");
        a.showAndWait();
    }

    public static void main(String[] args) {
        launch(args);
    }
}