/*
 * 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.shader;

import com.jme3.export.InputCapsule;
import com.jme3.export.JmeExporter;
import com.jme3.export.JmeImporter;
import com.jme3.export.OutputCapsule;
import com.jme3.export.Savable;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * A ShaderNode is the unit brick part of a shader program. A shader can be
 * describe with several shader nodes that are plugged together through inputs
 * and outputs.
 *
 * A ShaderNode is based on a definition that has a shader code, inputs and
 * output variables. This node can be activated based on a condition, and has
 * input and output mapping.
 *
 * This class is not intended to be used by JME users directly. It's the
 * structure for loading shader nodes from a J3md material definition file
 *
 * @author Nehon
 */
public class ShaderNode implements Savable, Cloneable {

    private String name;
    private ShaderNodeDefinition definition;
    private String condition;
    private List<VariableMapping> inputMapping = new ArrayList<VariableMapping>();
    private List<VariableMapping> outputMapping = new ArrayList<VariableMapping>();

    /**
     * creates a ShaderNode
     *
     * @param name the name
     * @param definition the ShaderNodeDefinition
     * @param condition the condition to activate this node
     */
    public ShaderNode(String name, ShaderNodeDefinition definition, String condition) {
        this.name = name;
        this.definition = definition;
        this.condition = condition;
    }

    /**
     * creates a ShaderNode
     */
    public ShaderNode() {
    }

    /**
     *
     * @return the name of the node
     */
    public String getName() {
        return name;
    }

    /**
     * sets the name of th node
     *
     * @param name the name
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * returns the definition
     *
     * @return the ShaderNodeDefinition
     */
    public ShaderNodeDefinition getDefinition() {
        return definition;
    }

    /**
     * sets the definition
     *
     * @param definition the ShaderNodeDefinition
     */
    public void setDefinition(ShaderNodeDefinition definition) {
        this.definition = definition;
    }

    /**
     *
     * @return the condition
     */
    public String getCondition() {
        return condition;
    }

    /**
     * sets the condition
     *
     * @param condition the condition
     */
    public void setCondition(String condition) {
        this.condition = condition;
    }

    /**
     * return a list of VariableMapping representing the input mappings of this
     * node
     *
     * @return the input mappings
     */
    public List<VariableMapping> getInputMapping() {
        return inputMapping;
    }

    /**
     * sets the input mappings
     *
     * @param inputMapping the input mappings
     */
    public void setInputMapping(List<VariableMapping> inputMapping) {
        this.inputMapping = inputMapping;
    }

    /**
     * return a list of VariableMapping representing the output mappings of this
     * node
     *
     * @return the output mappings
     */
    public List<VariableMapping> getOutputMapping() {
        return outputMapping;
    }

    /**
     * sets the output mappings
     *
     * @param outputMapping the output mappings
     */
    public void setOutputMapping(List<VariableMapping> outputMapping) {
        this.outputMapping = outputMapping;
    }

    /**
     * jme serialization
     *
     * @param ex the exporter
     * @throws IOException
     */
    @Override
    public void write(JmeExporter ex) throws IOException {
        OutputCapsule oc = (OutputCapsule) ex.getCapsule(this);
        oc.write(name, "name", "");
        oc.write(definition, "definition", null);
        oc.write(condition, "condition", null);
        oc.writeSavableArrayList((ArrayList) inputMapping, "inputMapping", new ArrayList<VariableMapping>());
        oc.writeSavableArrayList((ArrayList) outputMapping, "outputMapping", new ArrayList<VariableMapping>());
    }

    /**
     * jme serialization 
     *
     * @param im the importer
     * @throws IOException
     */
    @Override
    public void read(JmeImporter im) throws IOException {
        InputCapsule ic = (InputCapsule) im.getCapsule(this);
        name = ic.readString("name", "");
        definition = (ShaderNodeDefinition) ic.readSavable("definition", null);
        condition = ic.readString("condition", null);
        inputMapping = (List<VariableMapping>) ic.readSavableArrayList("inputMapping", new ArrayList<VariableMapping>());
        outputMapping = (List<VariableMapping>) ic.readSavableArrayList("outputMapping", new ArrayList<VariableMapping>());
    }

    /**
     * convenience tostring
     *
     * @return a string
     */
    @Override
    public String toString() {
        return "\nShaderNode{" + "\nname=" + name + ", \ndefinition=" + definition.getName() + ", \ncondition=" + condition + ", \ninputMapping=" + inputMapping + ", \noutputMapping=" + outputMapping + '}';
    }

    @Override
    public ShaderNode clone() throws CloneNotSupportedException {
        ShaderNode clone = (ShaderNode) super.clone();

        //No need to clone the definition.
        clone.definition = definition;

        clone.inputMapping = new ArrayList<>();
        for (VariableMapping variableMapping : inputMapping) {
            clone.inputMapping.add((VariableMapping) variableMapping.clone());
        }

        clone.outputMapping = new ArrayList<>();
        for (VariableMapping variableMapping : outputMapping) {
            clone.outputMapping.add((VariableMapping) variableMapping.clone());
        }

        return clone;
    }
}