/*
 * Copyright (c) 2009-2012 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.scene.control;

import com.jme3.export.InputCapsule;
import com.jme3.export.JmeExporter;
import com.jme3.export.JmeImporter;
import com.jme3.export.OutputCapsule;
import com.jme3.renderer.RenderManager;
import com.jme3.renderer.ViewPort;
import com.jme3.scene.Spatial;
import com.jme3.util.clone.Cloner;
import com.jme3.util.clone.JmeCloneable;
import java.io.IOException;

/**
 * An abstract implementation of the Control interface.
 *
 * @author Kirill Vainer
 */
public abstract class AbstractControl implements Control, JmeCloneable {

    protected boolean enabled = true;
    protected Spatial spatial;

    public AbstractControl(){
    }

    public void setSpatial(Spatial spatial) {
        if (this.spatial != null && spatial != null && spatial != this.spatial) {
            throw new IllegalStateException("This control has already been added to a Spatial");
        }   
        this.spatial = spatial;
    }
    
    public Spatial getSpatial(){
        return spatial;
    }

    public void setEnabled(boolean enabled) {
        this.enabled = enabled;
    }

    public boolean isEnabled() {
        return enabled;
    }

    /**
     * To be implemented in subclass.
     */
    protected abstract void controlUpdate(float tpf);

    /**
     * To be implemented in subclass.
     */
    protected abstract void controlRender(RenderManager rm, ViewPort vp);

    /**
     *  Default implementation of cloneForSpatial() that
     *  simply clones the control and sets the spatial.
     *  <pre>
     *  AbstractControl c = clone();
     *  c.spatial = null;
     *  c.setSpatial(spatial);
     *  </pre>
     *
     *  Controls that wish to be persisted must be Cloneable.
     */
    @Override
    public Control cloneForSpatial(Spatial spatial) {
        try {
            AbstractControl c = (AbstractControl)clone();
            c.spatial = null; // to keep setSpatial() from throwing an exception
            c.setSpatial(spatial);
            return c;
        } catch(CloneNotSupportedException e) {
            throw new RuntimeException( "Can't clone control for spatial", e );
        } 
    }

    @Override
    public Object jmeClone() {
        try {
            return super.clone();
        } catch( CloneNotSupportedException e ) {
            throw new RuntimeException( "Can't clone control for spatial", e );
        }
    }     

    @Override
    public void cloneFields( Cloner cloner, Object original ) { 
        this.spatial = cloner.clone(spatial);
    }
         
    public void update(float tpf) {
        if (!enabled)
            return;

        controlUpdate(tpf);
    }

    public void render(RenderManager rm, ViewPort vp) {
        if (!enabled)
            return;

        controlRender(rm, vp);
    }

    public void write(JmeExporter ex) throws IOException {
        OutputCapsule oc = ex.getCapsule(this);
        oc.write(enabled, "enabled", true);
        oc.write(spatial, "spatial", null);
    }

    public void read(JmeImporter im) throws IOException {
        InputCapsule ic = im.getCapsule(this);
        enabled = ic.readBoolean("enabled", true);
        spatial = (Spatial) ic.readSavable("spatial", null);
    }

}