/* <copyright>
Copyright (c) 2012, Motorola Mobility LLC.
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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.

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  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

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  contributors may be used to endorse or promote products derived from this
  software without specific prior written permission.

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</copyright> */

var Texture = require("js/lib/rdge/texture").Texture;


///////////////////////////////////////////////////////////////////////
// Class GLMaterial
//      GL representation of a material.
///////////////////////////////////////////////////////////////////////
var Material = function GLMaterial( world ) {
    ///////////////////////////////////////////////////////////////////////
    // Instance variables
    ///////////////////////////////////////////////////////////////////////
    this._name = "GLMaterial";
    this._shaderName = "undefined";

    this._time = 0.0;
    this._dTime = 0.01;

    // keep a reference to the owning GLWorld
    this._world = null;
    if(world) {
        this._world = world;
    }

    this._glTextures = [];      // indexed by uniform name

    // vertex deformation variables
    this._hasVertexDeformation = false;
    this._vertexDeformationRange = [0, 0, 1, 1];    // (xMin, yMin, xMax, yMax)
	this._vertexDeformationTolerance = 0.1;

    // RDGE variables
    this._shader = null;
    this._materialNode = null;


    ///////////////////////////////////////////////////////////////////////
    // Property Accessors
    ///////////////////////////////////////////////////////////////////////

    this.setName = function(n) {
        this._name = n;
    };

    this.getName = function() {
        return this._name;
    };

    this.setShaderName = function(n) {
        this._shaderName = n;
    };

    this.getShaderName = function() {
        return this._shaderName;
    };

    this.setWorld = function(world) {
        this._world = world;
    };

    this.getWorld = function() {
        return this._world;
    };

    this.getShader = function() {
        return this._shader;
    };

    this.getMaterialNode = function() {
        return this._materialNode;
    };

    // a material can be animated or not. default is not.
    // Any material needing continuous rendering should override this method
    this.isAnimated = function() {
        return false;
    };

    this.getTechniqueName   = function() {
        return 'default'
    };

    // the vertex shader can apply deformations requiring refinement in
    // certain areas.
    this.hasVertexDeformation = function()  {
        return this._hasVertexDeformation;
    };

    this.getVertexDeformationRange = function() {
        return this._vertexDeformationRange.slice();
    };

    this.getVertexDeformationTolerance = function() {
        return this._vertexDeformationTolerance;
    };

    ///////////////////////////////////////////////////////////////////////
    // Common Material Methods
    ///////////////////////////////////////////////////////////////////////
    this.getProperty = function( propName ) {
        return this._propValues[propName];
    };

    this.getPropertyCount = function() {
        return this._propNames.length;
    };

    this.getPropertyAtIndex = function( index ) {
        var rtnArr = [];
        if ((index < 0) || (index >= this.getPropertyCount())) {
            throw new Error( "property index " + index + " is out of range for material" );
        }

        return [ this._propNames[index],  this._propLabels[index],  this._propTypes[index],  this._propValues[index] ];
    };

    this.getAllProperties = function( propNames,  propValues,  propTypes,  propLabels) {
        // clear all the input arrays if there is junk in them
        propNames.length    = 0;
        propValues.length   = 0;
        propTypes.length    = 0;
        propLabels.length   = 0;

        var nProps = this._propNames.length;
        for (var i=0;  i<nProps;  i++) {
            propNames[i]    = this._propNames[i];
            propValues[i]   = this._propValues[this._propNames[i]];
            propTypes[i]    = this._propTypes[i];
            propLabels[i]   = this._propLabels[i];
        }
    };

    this.hasProperty = function( prop )
    {
        var propNames = [],  dummy = [];
        this.getAllProperties( propNames, dummy, dummy, dummy )
        for (var i=0;  i<propNames.length;  i++)
        {
            if (prop === propNames[i])  return true;
        }
    };

    this.getPropertyType = function( prop )
    {
        var n = this.getPropertyCount();
        for (var i=0;  i<n;  i++)
        {
            if (prop === this._propNames[i])  return this._propTypes[i];
        }
    };

    this.dup = function ()
    {
        // get the current values;
        var propNames = [], propValues = [], propTypes = [], propLabels = [];
        this.getAllProperties(propNames, propValues, propTypes, propLabels);

        // allocate a new material
        var MaterialLibrary = require("js/models/materials-model").MaterialsModel;
        var newMat = MaterialLibrary.createMaterialByShaderName( this.getShaderName() );

        // copy over the current values;
        var n = propNames.length;
        for (var i = 0; i < n; i++)
            newMat.setProperty(propNames[i], propValues[i]);

        return newMat;
    };

    this.validateProperty = function( prop, value ) {
        if(prop === "gradient") return true;

        var rtnVal = false;
        try
        {
            //if (!this._propValues[prop])  return false;

            // find the index of the property
            var n = this._propNames.length;
            var valType =  typeof value;
            for (var i=0;  i<n;  i++) {
                if (this._propNames[i] == prop) {

                    switch (this._propTypes[i])
                    {
                        case "color":
                            rtnVal = ((valType == "object") && (value.length >= 4));
                            break;

                        case "vector2d":
                            rtnVal = ((valType == "object") && (value.length >= 2));
                            break;

                        case "vector3d":
                            rtnVal = ((valType == "object") && (value.length >= 3));
                            break;

                        case "angle":
                        case "float":
                            rtnVal = (valType == "number");
                            break;

                        case "file":
                            rtnVal = ((valType == "string") || !value);
                            break;
                    }

                    break;
                }
            }
        }
        catch(e)  {
            console.log( "setting invalid material property: " + prop + ", value: " + value );
        }

//      if (!rtnVal && (prop != 'color')) {
//          console.log( "invalid material property: " + prop + " : " + value );
//        }

        return rtnVal;
    };

    this.setProperty = function( prop,  value )
    {
        var ok = this.validateProperty( prop, value );
        if (!ok && (prop != 'color')) {
            //console.log( "invalid property in Material:" + prop + " : " + value );
            return;
        }

        // get the technique if the shader is instantiated
        var technique;
        var material = this._materialNode;
        if (material)  technique = material.shaderProgram[this.getTechniqueName()];

        // make sure RDGE has the correct context
        if (this.getWorld())
            RDGE.globals.engine.setContext( this.getWorld().getCanvas().rdgeid );

        if(prop === "gradient") {
            this.setGradientData(value);
        } else {
        switch (this.getPropertyType(prop))
        {
            case "angle":
            case "float":
                this._propValues[prop] = value;
                if (technique)  technique[prop].set( [value] );
                break;

            case "file":
                this._propValues[prop] = value.slice();
                if (technique)
                {
                    var glTex = new Texture( this.getWorld(),  value );
                    this._glTextures[prop] = glTex;
                    glTex.render();
                    var tex = glTex.getTexture();
                    if (tex)  technique[prop].set( tex );
                }
                break;

            case "color":
            case "vector2d":
            case "vector3d":
                this._propValues[prop] = value.slice();
                if (technique)  technique[prop].set( value );
                break;
        }
        }
    };

    this.setShaderValues = function()
    {
        var material = this._materialNode;
        if (material)
        {
            var technique = material.shaderProgram[this.getTechniqueName()];
            if (technique)
            {
                var n = this.getPropertyCount();
                for (var i=0;  i<n;  i++)
                {
                    var prop = this._propNames[i],
                        value = this._propValues[prop];

                    switch (this._propTypes[i])
                    {
                        case "angle":
                        case "float":
                            technique[prop].set( [value] );
                            break;

                        case "file":
                            var glTex = this._glTextures[prop];
                            if (glTex)
                            {
                                var tex = glTex.getTexture();
                                if (tex)  technique[prop].set( tex );
                            }
                            else
                                this.setProperty( prop, value );
                            break;

                        case "color":
                        case "vector2d":
                        case "vector3d":
                            technique[prop].set( value );
                            break;
                    }
                }
            }
        }
    };

    // JSON export
    this.exportJSON = function()
    {
        var jObj =
        {
            'material'      : this.getShaderName(),
            'name'          : this.getName(),
            'dTime'         : this._dTime
        };

        var n = this.getPropertyCount();
        for (var i=0;  i<n;  i++)
        {
            var prop  = this._propNames[i],
                value = this._propValues[prop];

            jObj[prop] = value;
        }

        if (this.customExport)
            jObj = this.customExport( jObj );

        return jObj;
    };

    this.importJSON = function (jObj) {
        if (this.getShaderName() != jObj.material) throw new Error("ill-formed material");
        this.setName(jObj.name);

        try
        {
            for (var prop in jObj)
            {
                if ((prop != 'material') && (prop != 'name'))
                {
                    var value = jObj[prop];
                    this.setProperty( prop, value );
                }
            }
        }
        catch (e) {
            throw new Error("could not import material: " + jObj);
        }
    };

    ///////////////////////////////////////////////////////////////////////

    ///////////////////////////////////////////////////////////////////////
    // Methods
    ///////////////////////////////////////////////////////////////////////
    this.init = function( world ) {
        throw new Error( "Material.init() must be overridden by subclass" );
    };

	this.resetToDefault = function()  {
		// materials should override this functinon
	};

    this.update = function( time ) {
        // animated materials should implement the update method
    };

    this.fitToPrimitive = function( prim )  {
        // some materials need to preserve an aspect ratio - or someting else.
    };

	this.fitToPrimitiveArray = function( primArray )  {
		// some materials need to preserve an aspect ratio - or someting else.
	};

    this.registerTexture = function( texture ) {
        // the world needs to know about the texture map
        var world = this.getWorld();
        if (!world) {
            console.log( "**** world not defined for registering texture map: " + texture.lookUpName );
        } else {
            world.textureToLoad( texture );
        }
    };

    this.loadTexture = function( texMapName, wrap, mips ) {
        var tex;
        var world = this.getWorld();
        if (!world) {
            console.log( "world not defined for material with texture map" );
        } else {
            var renderer = world.getRenderer();
            tex = renderer.getTextureByName(texMapName, wrap, mips );
            this.registerTexture( tex );
        }

        return tex;
    };

    this.gradientType = null;

    this.getGradientData = function() {
        return null;
};

    this.setGradientData = function() {
        // override in linear-gradient-material and radial-gradient-material
    };
};

if (typeof exports === "object") {
    exports.Material = Material;
}