GameController.java

	package lab;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Random;
import java.util.Set;

import javafx.animation.AnimationTimer;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.fxml.FXML;
import javafx.scene.canvas.Canvas;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.control.Slider;
import javafx.scene.control.TextField;

public class GameController {

	private World world;
	
	@FXML
	private Slider angleSlider;
	
	@FXML
	private Slider strengthSlider;
	
	@FXML
	private Canvas canvas;
	
	@FXML
	private Label shoots;
	
	@FXML
	private Label hits;
	
	@FXML 
	private ListView<Score> scoreList;
	
	@FXML
	private TextField nameTextField;
	
	private List<Score> highScores = new LinkedList<>();
	
	private AnimationTimer animationTimer;
	
	public GameController() {
	}
	
	public void startGame() {
		initScoreList();

		this.world = new World(canvas.getWidth(), canvas.getHeight());
		this.world.setGameListener(new GameListenerImpl());
		//Draw scene on a separate thread to avoid blocking UI.
		animationTimer = new DrawingThread(canvas, world);
		angleSlider.valueProperty().addListener(this::angleChanged);
		world.setCannonAngle(angleSlider.getValue());
		
		strengthSlider.valueProperty().addListener(this::strenghtChanged);
		world.setCannonStrength(strengthSlider.getValue());
		animationTimer.start();
	}


	public void stopGame() {
		animationTimer.stop();
	}
	
	
	@FXML
	private void firePressed() {
		world.fire();
	}
	
	
	private void angleChanged(ObservableValue<? extends Number> observable
								, Number oldValue, Number newValue) {
		world.setCannonAngle(newValue.doubleValue());
	}

	private void strenghtChanged(ObservableValue<? extends Number> observable
			, Number oldValue, Number newValue) {
		world.setCannonStrength(newValue.doubleValue());
	}
	
	@FXML
	private void gameOverPressed() {
		Score score = new Score(new Random().nextInt(11), nameTextField.getText());
		scoreList.getItems().add(score);
		Collections.sort(scoreList.getItems(),  new ScoreComparator().reversed());
	}
	
	@FXML
	private void highScoresPressed() {
		Set<Score> tempScores = new HashSet<>();
		tempScores.addAll(highScores);
		highScores.clear();
		highScores.addAll(tempScores);
		Collections.sort(highScores,  new ScoreComparator().reversed());
		initScoreList();
	}

	@FXML
	private void savePressed() throws IOException {
		try(PrintWriter pw = new PrintWriter(new FileWriter("high_score.csv"))){
			for(Score score: highScores) {
				pw.printf("%s;%d\n", score.getName(), score.getScore());
			}
		}
	}
	
	
	@FXML
	private void loadPressed() throws IOException{
		highScores.clear();
		try(BufferedReader br = new BufferedReader(new FileReader("high_score.csv"))){
			String line;
			while(null != (line = br.readLine())) {
				String [] tokens = line.split(";");
				highScores.add(new Score(Integer.parseInt(tokens[1]), tokens[0]));
			}
		}
		initScoreList();
	}

	private void initScoreList() {
		scoreList.setItems(FXCollections.observableList(highScores));
	}
	
	private class GameListenerImpl implements GameListener {

		@Override
		public void stateChanged(int shoots, int hits) {
			GameController.this.shoots.setText("" + shoots);
			GameController.this.hits.setText("" + hits);
		}

		@Override
		public void gameOver() {
			stopGame();
		}
		
	}
	
	
}