package memory;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javafx.animation.FadeTransition;
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Pane;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import javafx.util.Duration;

public class Memory extends Application {

    private static final int NUM_OF_PAIRS = 8;
    private static final int NUM_PER_ROW = 4;

    Image A = new Image("file:bilder/apple.png");
    Image B = new Image("file:bilder/ananas.png");
    Image C = new Image("file:bilder/kiwi.png");
    Image D = new Image("file:bilder/melone.png");
    Image E = new Image("file:bilder/banana.png");
    Image F = new Image("file:bilder/pear.png");
    Image G = new Image("file:bilder/raspberry.png");
    Image H = new Image("file:bilder/strawberry.png");
    Image I = new Image("file:bilder/cocnut.png");

    private Tile selected = null;
    private int clickCount = 2;

    private Parent createContent() {

        Pane root = new Pane();
        root.setPrefSize(400, 400);

        List<Tile> tiles = new ArrayList<>();
        tiles.add(new Tile("A", A));
        tiles.add(new Tile("A", A));
        tiles.add(new Tile("B", B));
        tiles.add(new Tile("B", B));
        tiles.add(new Tile("C", C));
        tiles.add(new Tile("C", C));
        tiles.add(new Tile("D", D));
        tiles.add(new Tile("D", D));
        tiles.add(new Tile("E", E));
        tiles.add(new Tile("E", E));
        tiles.add(new Tile("F", F));
        tiles.add(new Tile("F", F));
        tiles.add(new Tile("G", G));
        tiles.add(new Tile("G", G));
        tiles.add(new Tile("H", H));
        tiles.add(new Tile("H", H));

        Collections.shuffle(tiles);

        for (int i = 0; i < tiles.size(); i++) {
            Tile tile = tiles.get(i);
            tile.setTranslateX(100 * (i % NUM_PER_ROW));
            tile.setTranslateY(100 * (i / NUM_PER_ROW));
            root.getChildren().add(tile);
        }

        return root;
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setScene(new Scene(createContent()));
        primaryStage.show();
    }

    private class Tile extends StackPane {
        private Text text = new Text();
        private ImageView imgView = new ImageView();

        public Tile(String value, Image img) {
            Rectangle border = new Rectangle(100, 100);
            border.setFill(null);
            border.setStroke(Color.BLACK);

            text.setText(value);

            imgView.setImage(img);
            imgView.setFitWidth(80);
            imgView.setFitHeight(80);

            setAlignment(Pos.CENTER);
            getChildren().addAll(border);
            getChildren().addAll(imgView);

            setOnMouseClicked(this::handleMouseClick);
            close();
        }

        public void handleMouseClick(MouseEvent event) {
            if (isOpen() || clickCount == 0)
                return;

            clickCount--;

            if (selected == null) {
                selected = this;
                open(() -> {
                });
            } else {
                open(() -> {
                    if (!hasSameValue(selected)) {
                        selected.close();
                        this.close();
                    }

                    selected = null;
                    clickCount = 2;
                });
            }
        }

        public boolean isOpen() {
            return imgView.getOpacity() == 1;
        }

        public void open(Runnable action) {
            FadeTransition ft = new FadeTransition(Duration.seconds(0.5), imgView);
            ft.setToValue(1);
            ft.setOnFinished(e -> action.run());
            ft.play();
        }

        public void close() {
            FadeTransition ft = new FadeTransition(Duration.seconds(0.5), imgView);
            ft.setToValue(0);
            ft.play();
        }

        public boolean hasSameValue(Tile other) {
            return text.getText().equals(other.text.getText());
        }
    }

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