import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
import javafx.util.Duration;

public class WhackAMouse extends Application {

    // constants
    private static final int BN_SIZE = 75; 
    private static final int N_ROWS  = 5;
    private static final int N_COLS  = 7;
    private static final int SPACING = 4;
    private static final int APP_WIDTH  = N_COLS * BN_SIZE;
    private static final int APP_HEIGHT = N_ROWS * BN_SIZE;
    private static final String IMG_NAME = "file:Mouse.gif"; // imgName

    private static final int INTERVAL = 1000;   // msec
    private static final int DURATION = 10;     // seconds

    // GUI variables
    private BorderPane mainPane;
    private GridPane   grid;
    private Button[][] buttons;
    private ImageView  ivMouse;

    private Timeline   timerMain;
    private Timeline   timerCountDown;

    // GUI: control panel
    private HBox       controlPanel;
    private Label      lbScore, lbCountDown;
    private Slider     slSpeed;

    // functional variables
    private int score; // gain if user clicks on the mouse button
    private int timeLeft;
    private Button bnCurrent;   // points to the button with the mouse

    public void start(Stage stage) {
        mainPane = new BorderPane();

        // setup calls
        setupControlPanel();
        setupImage();
        setupBoard();
        setupTimers();

        assignMouse();

        Scene scene = new Scene(mainPane, APP_WIDTH, APP_HEIGHT);

        stage.setTitle("CS112 F24 Whack-A-Mouse");
        stage.setScene(scene);

        stage.show();

        // TEMPORARY
        timerMain.play();
        timerCountDown.play();
    }

    private void setupControlPanel() {
        controlPanel = new HBox(SPACING);        
        mainPane.setTop(controlPanel);

        // create buttons
        
        // create slider for game speed/level control
        slSpeed = new Slider(0.5, 2, 1);

        // create labels
        // TEMPORARY
        timeLeft = DURATION;

        lbCountDown = new Label("" + DURATION);
        lbScore     = new Label("" + score);

        controlPanel.getChildren().addAll( // buttons
                new Label("Time left: "), lbCountDown,
                new Label("Score: "), lbScore);

    }

    private void setupImage() {
        ivMouse = new ImageView( new Image(IMG_NAME) );
    }

    private void setupBoard() {
        grid = new GridPane();
        mainPane.setCenter(grid);

        buttons = new Button[N_ROWS][N_COLS];

        for (int r = 0; r < N_ROWS; ++r) {
            for (int c = 0; c < N_COLS; ++c) {
                Button bn = new Button();
                bn.setPrefSize(BN_SIZE, BN_SIZE);

                // add to array
                buttons[r][c] = bn;

                bn.setOnAction( e -> { 
                    onClick(e);
                });

                // add to board (grid pane)
                grid.add(bn, c, r);
            }
        }
    }

    private void onClick(ActionEvent e) {
        Object src = e.getSource();
        Button bnClicked = (Button) src;


        // if the clicked button has the graphics, user scores

        // attempt 1: doesn't work, because all the previous buttons where
        //            the mouse was on still have the pointer (not null)
        //if (bnClicked.getGraphic() != null) { 

        // attempt 2: using global variable, bnCurrent
        if (bnClicked == bnCurrent) {
            ++score;
        }
        else {
            --score;
        }

        System.out.println("Current score = " + score);
        lbScore.setText("" + score);
    }

    private void setupTimers() {
        // timer for speed & mouse jumpting to a random location
        // setup key frame
        KeyFrame keyFrame1 = new KeyFrame(Duration.millis(INTERVAL), e -> { assignMouse(); });

        // setup timerMain
        timerMain = new Timeline(keyFrame1);
        timerMain.setCycleCount(Animation.INDEFINITE);

        // timer for count down
        KeyFrame keyFrame2 = new KeyFrame(Duration.seconds(1), e -> { updateTime(); });

        timerCountDown = new Timeline(keyFrame2);
        timerCountDown.setCycleCount(DURATION);

    }

    private void updateTime() {
        // update count down 
        --timeLeft;

        // update lbCountDown
        lbCountDown.setText("" + timeLeft);

        // check if time is up, perform gameOver routine if yes
        if (timeLeft <= 0) {
            gameOver();
        }
    }

    private void gameOver() {
        // disable all buttons
        disableButtons();

        timerCountDown.stop();
        timerMain.stop();
    }
    
    private void disableButtons() {
        for (Node bn : grid.getChildren()) {
            bn.setDisable(true);
        }
    }

    private void assignMouse() {
        // generate two random integers (row, column)
        int row = (int) (Math.random() * N_ROWS);
        int col = (int) (Math.random() * N_COLS);

        // assign ivMouse to the button at (row, column)
        bnCurrent = buttons[row][col];
        bnCurrent.setGraphic(ivMouse);
    }

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

}