/*
 * 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.plugins.blender.lights;

import java.util.logging.Level;
import java.util.logging.Logger;

import com.jme3.light.DirectionalLight;
import com.jme3.light.Light;
import com.jme3.light.PointLight;
import com.jme3.light.SpotLight;
import com.jme3.math.ColorRGBA;
import com.jme3.math.FastMath;
import com.jme3.scene.plugins.blender.AbstractBlenderHelper;
import com.jme3.scene.plugins.blender.BlenderContext;
import com.jme3.scene.plugins.blender.BlenderContext.LoadedDataType;
import com.jme3.scene.plugins.blender.file.BlenderFileException;
import com.jme3.scene.plugins.blender.file.Structure;

/**
 * A class that is used in light calculations.
 * @author Marcin Roguski
 */
public class LightHelper extends AbstractBlenderHelper {

    private static final Logger LOGGER = Logger.getLogger(LightHelper.class.getName());

    /**
     * This constructor parses the given blender version and stores the result. Some functionalities may differ in
     * different blender versions.
     * @param blenderVersion
     *            the version read from the blend file
     * @param blenderContext
     *            the blender context
     */
    public LightHelper(String blenderVersion, BlenderContext blenderContext) {
        super(blenderVersion, blenderContext);
    }

    public Light toLight(Structure structure, BlenderContext blenderContext) throws BlenderFileException {
        Light result = (Light) blenderContext.getLoadedFeature(structure.getOldMemoryAddress(), LoadedDataType.FEATURE);
        if (result != null) {
            return result;
        }
        Light light = null;
        int type = ((Number) structure.getFieldValue("type")).intValue();
        switch (type) {
            case 0:// Lamp
                light = new PointLight();
                float distance = ((Number) structure.getFieldValue("dist")).floatValue();
                ((PointLight) light).setRadius(distance);
                break;
            case 1:// Sun
                LOGGER.log(Level.WARNING, "'Sun' lamp is not supported in jMonkeyEngine. Using PointLight with radius = Float.MAX_VALUE.");
                light = new PointLight();
                ((PointLight) light).setRadius(Float.MAX_VALUE);
                break;
            case 2:// Spot
                light = new SpotLight();
                // range
                ((SpotLight) light).setSpotRange(((Number) structure.getFieldValue("dist")).floatValue());
                // outer angle
                float outerAngle = ((Number) structure.getFieldValue("spotsize")).floatValue() * FastMath.DEG_TO_RAD * 0.5f;
                ((SpotLight) light).setSpotOuterAngle(outerAngle);

                // inner angle
                float spotblend = ((Number) structure.getFieldValue("spotblend")).floatValue();
                spotblend = FastMath.clamp(spotblend, 0, 1);
                float innerAngle = outerAngle * (1 - spotblend);
                ((SpotLight) light).setSpotInnerAngle(innerAngle);
                break;
            case 3:// Hemi
                LOGGER.log(Level.WARNING, "'Hemi' lamp is not supported in jMonkeyEngine. Using DirectionalLight instead.");
            case 4:// Area
                light = new DirectionalLight();
                break;
            default:
                throw new BlenderFileException("Unknown light source type: " + type);
        }
        float r = ((Number) structure.getFieldValue("r")).floatValue();
        float g = ((Number) structure.getFieldValue("g")).floatValue();
        float b = ((Number) structure.getFieldValue("b")).floatValue();
        light.setColor(new ColorRGBA(r, g, b, 1.0f));
        light.setName(structure.getName());
        return light;
    }
}