/*
 * Copyright (c) 2009-2010 jMonkeyEngine
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jme3.niftygui;

import com.jme3.input.InputManager;
import com.jme3.input.KeyInput;
import com.jme3.input.RawInputListener;
import com.jme3.input.event.*;
import de.lessvoid.nifty.Nifty;
import de.lessvoid.nifty.NiftyInputConsumer;
import de.lessvoid.nifty.tools.resourceloader.NiftyResourceLoader;
import de.lessvoid.nifty.input.keyboard.KeyboardInputEvent;
import de.lessvoid.nifty.spi.input.InputSystem;
import java.util.ArrayList;

public class InputSystemJme implements InputSystem, RawInputListener {

    private final ArrayList<InputEvent> inputQueue = new ArrayList<InputEvent>();

    private InputManager inputManager;

    private boolean isDragging = false, niftyOwnsDragging = false;
    private boolean pressed = false;
    private int buttonIndex;
    private int x, y;
    private int height;

    private boolean shiftDown = false;
    private boolean ctrlDown  = false;

    private Nifty nifty;

    public InputSystemJme(InputManager inputManager){
        this.inputManager = inputManager;
    }

    public void setResourceLoader(NiftyResourceLoader niftyResourceLoader) {
    }

    public void setNifty(Nifty nifty) {
        this.nifty = nifty;
    }

    /**
     * @param height The height of the viewport. Used to convert
     * buttom-left origin to upper-left origin.
     */
    public void setHeight(int height){
        this.height = height;
    }

    public void setMousePosition(int x, int y){
    }

    public void beginInput(){
    }

    public void endInput(){
        boolean result = nifty.update();
    }

    private void onTouchEventQueued(TouchEvent evt, NiftyInputConsumer nic) {  
        boolean consumed = false;

        x = (int) evt.getX();
        y = (int) (height - evt.getY());

        switch (evt.getType()) {
           case DOWN:
               consumed = nic.processMouseEvent(x, y, 0, 0, false);
               isDragging = true;
               niftyOwnsDragging = consumed;
               if (consumed){
                   evt.setConsumed();
               }

               break;

           case UP:
               if (niftyOwnsDragging){
                   consumed = nic.processMouseEvent(x, y, 0, buttonIndex, pressed);
                   if (consumed){
                       evt.setConsumed();
                   }
               }

               isDragging = false;
               niftyOwnsDragging = false;
               break;
       }
    }
    
    private void onMouseMotionEventQueued(MouseMotionEvent evt, NiftyInputConsumer nic) {
        x = evt.getX();
        y = height - evt.getY();
        nic.processMouseEvent(x, y, evt.getDeltaWheel(), buttonIndex, pressed);
//        if (nic.processMouseEvent(niftyEvt) /*|| nifty.getCurrentScreen().isMouseOverElement()*/){
            // Do not consume motion events
            //evt.setConsumed();
//        }
    }

    private void onMouseButtonEventQueued(MouseButtonEvent evt, NiftyInputConsumer nic) {
        boolean wasPressed = pressed;
        boolean forwardToNifty = true;
        
        buttonIndex = evt.getButtonIndex();
        pressed = evt.isPressed();
        
        // Mouse button raised. End dragging
        if (wasPressed && !pressed){
            if (!niftyOwnsDragging){
                forwardToNifty = false;
            }
            isDragging = false;
            niftyOwnsDragging = false;
        }

        boolean consumed = false;
        if (forwardToNifty){
            consumed = nic.processMouseEvent(x, y, 0, buttonIndex, pressed);
            if (consumed){
                evt.setConsumed();
            }
        }
        
        // Mouse button pressed. Begin dragging
        if (!wasPressed && pressed){
            isDragging = true;
            niftyOwnsDragging = consumed;
        }
    }

    private void onKeyEventQueued(KeyInputEvent evt, NiftyInputConsumer nic) {
        int code = evt.getKeyCode();

        if (code == KeyInput.KEY_LSHIFT || code == KeyInput.KEY_RSHIFT) {
            shiftDown = evt.isPressed();
        } else if (code == KeyInput.KEY_LCONTROL || code == KeyInput.KEY_RCONTROL) {
            ctrlDown = evt.isPressed();
        }
        
        KeyboardInputEvent keyEvt = new KeyboardInputEvent(code,
                                                           evt.getKeyChar(),
                                                           evt.isPressed(),
                                                           shiftDown,
                                                           ctrlDown);

        if (nic.processKeyboardEvent(keyEvt)){
            evt.setConsumed();
        }
    }
    
    public void onMouseMotionEvent(MouseMotionEvent evt) {
        // Only forward the event if there's actual motion involved.
        if (inputManager.isCursorVisible() && (evt.getDX() != 0 ||
                                               evt.getDY() != 0 ||
                                               evt.getDeltaWheel() != 0)){
            inputQueue.add(evt);
        }
    }

    public void onMouseButtonEvent(MouseButtonEvent evt) {
        if (inputManager.isCursorVisible() && evt.getButtonIndex() >= 0 && evt.getButtonIndex() <= 2){
            inputQueue.add(evt);
        }
    }
    
    public void onJoyAxisEvent(JoyAxisEvent evt) {
    }

    public void onJoyButtonEvent(JoyButtonEvent evt) {
    }
    
    public void onKeyEvent(KeyInputEvent evt) {
        inputQueue.add(evt);
    }
    
    public void onTouchEvent(TouchEvent evt) {     
        inputQueue.add(evt);
    }

    public void forwardEvents(NiftyInputConsumer nic) {
        int queueSize = inputQueue.size();

        for (int i = 0; i < queueSize; i++){
            InputEvent evt = inputQueue.get(i);
            if (evt instanceof MouseMotionEvent){
                onMouseMotionEventQueued( (MouseMotionEvent)evt, nic);
            }else if (evt instanceof MouseButtonEvent){
                onMouseButtonEventQueued( (MouseButtonEvent)evt, nic);
            }else if (evt instanceof KeyInputEvent){
                onKeyEventQueued( (KeyInputEvent)evt, nic);
            }else if (evt instanceof TouchEvent){
                onTouchEventQueued( (TouchEvent)evt, nic);
            }
        }

        inputQueue.clear();
    }
    
    
}