package com.badlogic.gdx.input;

import java.io.DataInputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.HashSet;
import java.util.Set;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Input;
import com.badlogic.gdx.InputProcessor;
import com.badlogic.gdx.utils.GdxRuntimeException;

/**
 * <p>An {@link Input} implementation that receives touch, key, accelerometer
 * and compass events from a remote Android device. Just instantiate it
 * and specify the port it should listen on for incoming connections (default
 * 8190). Then store the new RemoteInput instance in Gdx.input. That's it.</p>
 * 
 * <p>On your Android device you can use the gdx-remote application available
 * on the Google Code page as an APK or in SVN (extensions/gdx-remote). Open it,
 * specify the IP address and the port of the PC your libgdx app is running on
 * and then tap away.</p>
 * 
 * <p>The touch coordinates will be translated to the desktop window's coordinate
 * system, no matter the orientation of the device</p>
 * 
 * @author mzechner
 *
 */
public class RemoteInput implements Runnable, Input {
	class KeyEvent {
		static final int KEY_DOWN = 0;
		static final int KEY_UP = 1;
		static final int KEY_TYPED = 2;

		long timeStamp;
		int type;
		int keyCode;
		char keyChar;
	}

	class TouchEvent {
		static final int TOUCH_DOWN = 0;
		static final int TOUCH_UP = 1;
		static final int TOUCH_DRAGGED = 2;

		long timeStamp;
		int type;
		int x;
		int y;
		int pointer;
	}
	
	class EventTrigger implements Runnable {
		TouchEvent touchEvent;
		KeyEvent keyEvent;
		
		public EventTrigger(TouchEvent touchEvent, KeyEvent keyEvent) {
			this.touchEvent = touchEvent;
			this.keyEvent = keyEvent;		
		}
		
		@Override public void run () {
			justTouched = false;
			if(processor != null) {
				if(touchEvent != null) {
					touchX[touchEvent.pointer] = touchEvent.x;
					touchY[touchEvent.pointer] = touchEvent.y;					
					switch(touchEvent.type) {
					case TouchEvent.TOUCH_DOWN:
						processor.touchDown(touchEvent.x, touchEvent.y, touchEvent.pointer, Input.Buttons.LEFT);
						isTouched[touchEvent.pointer] = true;
						justTouched = true;
						break;
					case TouchEvent.TOUCH_UP:
						processor.touchUp(touchEvent.x, touchEvent.y, touchEvent.pointer, Input.Buttons.LEFT);
						isTouched[touchEvent.pointer] = false;
						break;
					case TouchEvent.TOUCH_DRAGGED:
						processor.touchDragged(touchEvent.x, touchEvent.y, touchEvent.pointer);
						break;
					}
				}
				if(keyEvent != null) {
					switch(keyEvent.type) {
					case KeyEvent.KEY_DOWN:
						processor.keyDown(keyEvent.keyCode);
						keys.add(keyEvent.keyCode);
						break;
					case KeyEvent.KEY_UP:
						processor.keyUp(keyEvent.keyCode);
						keys.remove(keyEvent.keyCode);
						break;
					case KeyEvent.KEY_TYPED:
						processor.keyTyped(keyEvent.keyChar);
						break;
					}
				}
			} else {
				if(touchEvent != null) {
					touchX[touchEvent.pointer] = touchEvent.x;
					touchY[touchEvent.pointer] = touchEvent.y;
					if(touchEvent.type == TouchEvent.TOUCH_DOWN) {						
						isTouched[touchEvent.pointer] = true;
						justTouched = true;
					}
					if(touchEvent.type == TouchEvent.TOUCH_UP) {
						isTouched[touchEvent.pointer] = false;
					}
				}
				if(keyEvent != null) {
					if(keyEvent.type == KeyEvent.KEY_DOWN) keys.add(keyEvent.keyCode);
					if(keyEvent.type == KeyEvent.KEY_UP) keys.remove(keyEvent.keyCode);
				}
			}
		}		
	}
		
	public static int DEFAULT_PORT = 8190;
	private ServerSocket serverSocket;
	private float[] accel = new float[3];
	private float[] compass = new float[3];
	private boolean multiTouch = false;
	private float remoteWidth = 0;
	private float remoteHeight = 0;
	private Set<Integer> keys = new HashSet<Integer>();	
	private int[] touchX = new int[20];
	private int[] touchY = new int[20];
	private boolean isTouched[] = new boolean[20];
	private boolean justTouched = false;
	private InputProcessor processor = null;
	private final int port;
	public final String[] ips;
	
	public RemoteInput() {
		this(DEFAULT_PORT);
	}
	
	public RemoteInput(int port) {
		try {
			this.port = port;
			serverSocket = new ServerSocket(port);
			Thread thread = new Thread(this);
			thread.setDaemon(true);
			thread.start();						
			InetAddress[] allByName = InetAddress.getAllByName(InetAddress.getLocalHost().getHostName());
			ips = new String[allByName.length];
			for(int i = 0; i < allByName.length; i++) {
				ips[i] = allByName[i].getHostAddress();
			}						
		} catch(Exception e) {
			throw new GdxRuntimeException("Couldn't open listening socket at port '" + port+ "'", e);
		}
	}

	@Override public void run () {
		while(true) {
			try { 
				System.out.println("listening, port " + port);
				Socket socket = null;
				while(true) {			
						socket = serverSocket.accept();
						break;			
				}										
				socket.setTcpNoDelay(true);	
				socket.setSoTimeout(3000);				
				
				DataInputStream in = new DataInputStream(socket.getInputStream());
				multiTouch = in.readBoolean();
				while(true) {
					int event = in.readInt();
					KeyEvent keyEvent = null;
					TouchEvent touchEvent = null;
					switch(event) {
					case RemoteSender.ACCEL:
						accel[0] = in.readFloat();
						accel[1] = in.readFloat();
						accel[2] = in.readFloat();
						break;
					case RemoteSender.COMPASS:
						compass[0] = in.readFloat();
						compass[1] = in.readFloat();
						compass[2] = in.readFloat();
						break;
					case RemoteSender.SIZE:
						remoteWidth = in.readFloat();
						remoteHeight = in.readFloat();
						break;
					case RemoteSender.KEY_DOWN:
						keyEvent = new KeyEvent();
						keyEvent.keyCode = in.readInt();
						keyEvent.type = KeyEvent.KEY_DOWN;
						break;
					case RemoteSender.KEY_UP:
						keyEvent = new KeyEvent();
						keyEvent.keyCode = in.readInt();
						keyEvent.type = KeyEvent.KEY_UP;
						break;
					case RemoteSender.KEY_TYPED:
						keyEvent = new KeyEvent();
						keyEvent.keyChar = in.readChar();
						keyEvent.type = KeyEvent.KEY_TYPED;
						break;
					case RemoteSender.TOUCH_DOWN:
						touchEvent = new TouchEvent();
						touchEvent.x = (int)((in.readInt() / remoteWidth) * Gdx.graphics.getWidth());
						touchEvent.y = (int)((in.readInt() / remoteHeight) * Gdx.graphics.getHeight());
						touchEvent.pointer = in.readInt();
						touchEvent.type = TouchEvent.TOUCH_DOWN;
						break;
					case RemoteSender.TOUCH_UP:
						touchEvent = new TouchEvent();
						touchEvent.x = (int)((in.readInt() / remoteWidth) * Gdx.graphics.getWidth());
						touchEvent.y = (int)((in.readInt() / remoteHeight) * Gdx.graphics.getHeight());
						touchEvent.pointer = in.readInt();
						touchEvent.type = TouchEvent.TOUCH_UP;
						break;
					case RemoteSender.TOUCH_DRAGGED:
						touchEvent = new TouchEvent();
						touchEvent.x = (int)((in.readInt() / remoteWidth) * Gdx.graphics.getWidth());
						touchEvent.y = (int)((in.readInt() / remoteHeight) * Gdx.graphics.getHeight());
						touchEvent.pointer = in.readInt();
						touchEvent.type = TouchEvent.TOUCH_DRAGGED;
						break;
					}
										
					Gdx.app.postRunnable(new EventTrigger(touchEvent, keyEvent));
				}			
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	@Override public boolean isAccelerometerAvailable () {
		return true;
	}

	@Override public float getAccelerometerX () {
		return accel[0];
	}

	@Override public float getAccelerometerY () {
		return accel[1];
	}

	@Override public float getAccelerometerZ () {
		return accel[2];
	}

	@Override public int getX () {
		return touchX[0];
	}

	@Override public int getX (int pointer) {
		return touchX[pointer];
	}

	@Override public int getY () {
		return touchY[0];
	}

	@Override public int getY (int pointer) {
		return touchY[pointer];
	}

	@Override public boolean isTouched () {				
		return isTouched[0];
	}

	@Override public boolean justTouched () {
		return justTouched;
	}

	@Override public boolean isTouched (int pointer) {
		return isTouched[pointer];
	}

	@Override public boolean isButtonPressed (int button) {
		if(button != Buttons.LEFT) return false;
		for(int i = 0; i < isTouched.length; i++)
			if(isTouched[i]) return true;
		return false;
	}

	@Override public boolean isKeyPressed (int key) {
		return keys.contains(key);
	}

	@Override public void getTextInput (TextInputListener listener, String title, String text) {
		Gdx.app.getInput().getTextInput(listener, title, text);
	}

	@Override public void setOnscreenKeyboardVisible (boolean visible) {		
	}

	@Override public boolean supportsOnscreenKeyboard () {
		return false;
	}

	@Override public boolean supportsMultitouch () {
		return multiTouch;
	}

	@Override public boolean supportsVibrator () {
		return true;
	}

	@Override public void vibrate (int milliseconds) {
		
	}

	@Override public void vibrate (long[] pattern, int repeat) {
		
	}

	@Override public void cancelVibrate () {
		
	}

	@Override public boolean supportsCompass () {
		return true;
	}

	@Override public float getAzimuth () {
		return compass[0];
	}

	@Override public float getPitch () {
		return compass[1];
	}

	@Override public float getRoll () {
		return compass[2];
	}

	@Override public void setCatchBackKey (boolean catchBack) {
		
	}

	@Override public void setInputProcessor (InputProcessor processor) {
		this.processor = processor;
	}
	
	/**
	 * @return the IP addresses {@link RemoteSender} or gdx-remote should connect to. Most likely the LAN addresses if behind a NAT.
	 */
	public String[] getIPs() {
		return ips;
	}
}