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    package controller;
    
    import static java.util.Objects.*;
    
    import java.util.ArrayList;
    import java.util.List;
    
    
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    import javafx.animation.Animation;
    import javafx.animation.KeyFrame;
    import javafx.animation.Timeline;
    import javafx.event.ActionEvent;
    import javafx.event.EventHandler;
    import javafx.fxml.FXML;
    import javafx.scene.control.Button;
    
    import javafx.scene.control.Label;
    
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    import javafx.scene.control.ToggleButton;
    import javafx.scene.control.ToggleGroup;
    import javafx.util.Duration;
    import javafx.util.Pair;
    
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    import model.Board;
    
    import model.Entity;
    import model.FireFighterScenario;
    
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    import util.Position;
    import view.Grid;
    import view.ViewElement;
    
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    public class Controller {
    
      public static final int PERIOD_IN_MILLISECONDS = 50;
      @FXML
    
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      public Button restartButton;
      @FXML
      public Button oneStepButton;
      @FXML
    
      public Label generationNumberLabel;
      @FXML
    
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      private ToggleButton pauseToggleButton;
      @FXML
      private ToggleButton playToggleButton;
      @FXML
    
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      private Grid<ViewElement> grid;
    
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      private Timeline timeline;
    
      private Board<Entity> board;
    
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      @FXML
      private void initialize() {
        initializePlayAndPauseToggleButtons();
        initializeTimeline();
      }
    
      private void initializePlayAndPauseToggleButtons() {
        ToggleGroup toggleGroup = new PersistentToggleGroup();
        toggleGroup.getToggles().addAll(playToggleButton, pauseToggleButton);
        pauseToggleButton.setSelected(true);
      }
    
    
      private void setModel(Board<Entity> board) {
        this.board = requireNonNull(board, "board is null");
    
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      }
    
      private void updateBoard(){
        List<Position> updatedPositions = board.updateToNextGeneration();
        List<Pair<Position, ViewElement>> updatedSquares = new ArrayList<>();
        for(Position updatedPosition : updatedPositions){
    
          Entity squareState = board.getState(updatedPosition);
    
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          ViewElement viewElement = getViewElement(squareState);
          updatedSquares.add(new Pair<>(updatedPosition, viewElement));
        }
        grid.repaint(updatedSquares);
    
        updateGenerationLabel(board.stepNumber());
    
      private void repaintGrid(){
    
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        int columnCount = board.columnCount();
        int rowCount = board.rowCount();
        ViewElement[][] viewElements = new ViewElement[rowCount][columnCount];
        for(int column = 0; column < columnCount; column++)
          for(int row = 0; row < rowCount; row++)
            viewElements[row][column] = getViewElement(board.getState(new Position(row, column)));
        grid.repaint(viewElements);
    
        updateGenerationLabel(board.stepNumber());
    
      private ViewElement getViewElement(Entity entity) {
          return new ViewElement(entity.getViewColor());
    
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      }
    
      private void initializeTimeline() {
        Duration duration = new Duration(Controller.PERIOD_IN_MILLISECONDS);
        EventHandler<ActionEvent> eventHandler =
                event -> updateBoard();
        KeyFrame keyFrame = new KeyFrame(duration, eventHandler);
        timeline = new Timeline(keyFrame);
        timeline.setCycleCount(Animation.INDEFINITE);
      }
    
      public void play() {
        timeline.play();
      }
    
      public void pause() {
        timeline.pause();
      }
    
    
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      public void pauseToggleButtonAction() {
    
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        this.pause();
      }
    
    
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      public void playToggleButtonAction() {
    
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        this.play();
      }
    
    
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      public void restartButtonAction() {
    
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        this.pause();
        board.reset();
        pauseToggleButton.setSelected(true);
    
        repaintGrid();
    
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      }
    
      public void initialize(int squareWidth, int squareHeight, int columnCount,
                                    int rowCount, int initialFireCount, int initialFirefighterCount) {
    
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        grid.setDimensions(columnCount, rowCount, squareWidth, squareHeight);
    
        this.setModel(new FireFighterScenario(columnCount, rowCount, initialFireCount, initialFirefighterCount));
    
        repaintGrid();
    
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      public void oneStepButtonAction() {
    
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        this.pause();
        updateBoard();
      }
    
      private void updateGenerationLabel(int value){
    
        generationNumberLabel.setText(Integer.toString(value));
      }