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/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.graphics.g3d;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.TextureRef;
import com.badlogic.gdx.graphics.glutils.ShaderProgram;

/** Holds material data. The data contains texture/shader information and material properties for lighting. Currently the material
 * also supports partial serialization of its data.

 * 
 * @author Dave Clayton  */
public class Material {
	public String Name;
	public ShaderProgram Shader;
	public TextureRef Texture = null;
	public String TexturePath = "";
	public Color Ambient = null;
	public Color Diffuse = null;
	public Color Specular = null;
	public Color Emissive = null;
	public int BlendSourceFactor = 0;
	public int BlendDestFactor = 0;
	private static final float tmp[] = new float[4];

	/** Constructs a new material.
	 * @param name The material's name. */
	public Material (String name) {
		Name = name;
	}

	private void setTmpArray (float r, float g, float b, float a) {
		tmp[0] = r;
		tmp[1] = g;
		tmp[2] = b;
		tmp[3] = a;
	}

	/** Sends the material properties to the OpenGL state.
	 * @param face Which faces this applies to (e.g. GL10.GL_FRONT). */
	public void set (int face) {
		// TODO: should probably load shaderprogram here if we're using them
		GL10 gl = Gdx.graphics.getGL10();
		// TODO: caching of last material set using statics to see if we need to set material states again
		if (Ambient != null) {
			setTmpArray(Ambient.r, Ambient.g, Ambient.b, Ambient.a);
			gl.glMaterialfv(face, GL10.GL_AMBIENT, tmp, 0);
		}
		if (Diffuse != null) {
			setTmpArray(Diffuse.r, Diffuse.g, Diffuse.b, Diffuse.a);
			gl.glMaterialfv(face, GL10.GL_DIFFUSE, tmp, 0);
		}

		if (BlendSourceFactor > 0) {
			gl.glBlendFunc(BlendSourceFactor, BlendDestFactor);
			gl.glEnable(GL10.GL_BLEND);
		} else {
			gl.glDisable(GL10.GL_BLEND);
		}
	}

	/** Serialization. Experimental.
	 * @param i The DataInputStream to serialize from.
	 * @return whether serialization succeeded.
	 * @throws IOException */
	public boolean read (DataInputStream i) throws IOException {
		Name = i.readUTF();
		TexturePath = i.readUTF();
		boolean hasAmbient = i.readBoolean();
		if (hasAmbient) {
			float r = i.readFloat();
			float g = i.readFloat();
			float b = i.readFloat();
			float a = i.readFloat();
			Ambient = new Color(r, g, b, a);
		}
		boolean hasDiffuse = i.readBoolean();
		if (hasDiffuse) {
			float r = i.readFloat();
			float g = i.readFloat();
			float b = i.readFloat();
			float a = i.readFloat();
			Diffuse = new Color(r, g, b, a);
		}
		BlendSourceFactor = i.readInt();
		BlendDestFactor = i.readInt();
		return true;
	}

	/** Serialization. Experimental.
	 * @param o The DataOutputStream to serialize to.
	 * @return Whether serialization succeeded.
	 * @throws IOException */
	public boolean write (DataOutputStream o) throws IOException {
		// TODO: serialize out shader
		o.writeUTF(Name);
		// process path
		String filename = Texture.Name.substring(Texture.Name.lastIndexOf("\\") + 1);
		o.writeUTF(filename);
		o.writeBoolean(Ambient != null);
		if (Ambient != null) {
			o.writeFloat(Ambient.r);
			o.writeFloat(Ambient.g);
			o.writeFloat(Ambient.b);
			o.writeFloat(Ambient.a);
		}
		o.writeBoolean(Diffuse != null);
		if (Diffuse != null) {
			o.writeFloat(Diffuse.r);
			o.writeFloat(Diffuse.g);
			o.writeFloat(Diffuse.b);
			o.writeFloat(Diffuse.a);
		}
		o.writeInt(BlendSourceFactor);
		o.writeInt(BlendDestFactor);
		return true;
	}
}