package jrummikub.control;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import jrummikub.model.GameSettings;
import jrummikub.model.GameState;
import jrummikub.model.IRoundState;
import jrummikub.util.Event;
import jrummikub.util.Event3;
import jrummikub.util.IEvent3;
import jrummikub.util.IListener1;
import jrummikub.view.IView;

/**
 * The save control is responsible for loading and saving game and round states
 */
public class SaveControl {
	private GameSettings gameSettings;
	private GameState gameState;
	private IRoundState roundState;
	private Event3<GameSettings, GameState, IRoundState> loadEvent = new Event3<GameSettings, GameState, IRoundState>();
	private Event loadErrorEvent = new Event();

	/**
	 * Creates a new SaveControl
	 * 
	 * @param view
	 *            the view to use
	 */
	public SaveControl(final IView view) {
		view.getSaveEvent().add(new IListener1<File>() {
			@Override
			public void handle(File file) {
				save(file);
			}
		});
		view.getLoadFileEvent().add(new IListener1<File>() {
			@Override
			public void handle(final File file) {
				load(file);
			}
		});
	}

	/**
	 * Getter for loadEvent
	 * 
	 * @return loadEvent
	 */
	public IEvent3<GameSettings, GameState, IRoundState> getLoadEvent() {
		return loadEvent;
	}

	/**
	 * Sets the current game settings
	 * 
	 * @param gameSettings
	 *            the game settings
	 */
	public void setGameSettings(GameSettings gameSettings) {
		this.gameSettings = gameSettings;
	}

	/**
	 * Sets the current game state
	 * 
	 * @param gameState
	 *            the game state
	 */
	public void setGameState(GameState gameState) {
		this.gameState = gameState;
	}

	/**
	 * Sets the current round state
	 * 
	 * @param roundState
	 *            the round state
	 */
	public void setRoundState(IRoundState roundState) {
		this.roundState = roundState;
	}

	/**
	 * Loads the specified file and sets game state and round state. If the file
	 * selected cannot be handled, an error will occur and show
	 * 
	 * @param file
	 *            to be loaded
	 */
	private void load(File file) {
		try {
			ObjectInputStream stream = new ObjectInputStream(
					new FileInputStream(file));

			gameSettings = (GameSettings) stream.readObject();
			gameState = (GameState) stream.readObject();
			roundState = (IRoundState) stream.readObject();

			stream.close();

			if (gameState == null || gameSettings == null) {
				loadErrorEvent.emit();
				return;
			}

			loadEvent.emit(gameSettings, gameState, roundState);

		} catch (Exception e) {
			loadErrorEvent.emit();
		}
	}

	/**
	 * The load error event is emitted when the file selected for loading is not
	 * a rum file
	 * 
	 * @return the event
	 */
	public Event getLoadErrorEvent() {
		return loadErrorEvent;
	}

	/**
	 * Saves the current game state and round state to a file with the specified
	 * file name
	 * 
	 * @param file
	 *            file to save game in
	 */
	private void save(File file) {
		if (gameState == null || gameSettings == null) {
			return;
		}
		try {
			ObjectOutputStream stream = new ObjectOutputStream(
					new FileOutputStream(file));

			stream.writeObject(gameSettings);
			stream.writeObject(gameState);
			stream.writeObject(roundState);
			stream.flush();

			stream.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}