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var MaterialParser = require("js/lib/rdge/materials/material-parser").MaterialParser;
var Material = require("js/lib/rdge/materials/material").Material;
var ShapePrimitive = require("js/lib/geom/shape-primitive").ShapePrimitive;

var LinearGradientMaterial = function LinearGradientMaterial() {
    ///////////////////////////////////////////////////////////////////////
    // Instance variables
    ///////////////////////////////////////////////////////////////////////
    this._name = "Linear Gradient";
    this._shaderName = "linearGradient";

    this._color1 = [1, 0, 0, 1];
    this._color2 = [0, 1, 0, 1];
    this._color3 = [0, 0, 1, 1];
    this._color4 = [0, 1, 1, 1];
    this._colorStop1 = 0.0;
    this._colorStop2 = 0.3;
    this._colorStop3 = 0.6;
    this._colorStop4 = 1.0;
    //  this._colorCount    = 4;
    this._angle = 0.0; // the shader takes [cos(a), sin(a)]

    this._textureTransform = [1,0,0, 0,1,0, 0,0,1];

    ///////////////////////////////////////////////////////////////////////
    // Property Accessors
    ///////////////////////////////////////////////////////////////////////
    this.getShaderDef       = function()            {  return linearGradientMaterialDef;    }

    ///////////////////////////////////////////////////////////////////////
    // Material Property Accessors
    ///////////////////////////////////////////////////////////////////////
    this._propNames = ["u_color1", "u_color2", "u_color3", "u_color4", "u_colorStop1", "u_colorStop2", "u_colorStop3", "u_colorStop4", "u_cos_sin_angle"];
    this._propLabels = ["Color 1", "Color 2", "Color 3", "Color 4", "Color Stop 1", "Color Stop 2", "Color Stop 3", "Color Stop 4", "Angle"];
    this._propTypes = ["color", "color", "color", "color", "float", "float", "float", "float", "vector2d"];
    this._propValues = [];

    this._propValues[this._propNames[0]] = this._color1.slice(0);
    this._propValues[this._propNames[1]] = this._color2.slice(0);
    this._propValues[this._propNames[2]] = this._color3.slice(0);
    this._propValues[this._propNames[3]] = this._color4.slice(0);

    this._propValues[this._propNames[4]] = this._colorStop1;
    this._propValues[this._propNames[5]] = this._colorStop2;
    this._propValues[this._propNames[6]] = this._colorStop3;
    this._propValues[this._propNames[7]] = this._colorStop4;

    this._propValues[this._propNames[8]] = [ Math.cos(this._angle), Math.sin(this._angle) ];

    ///////////////////////////////////////////////////////////////////////
    // Methods
    ///////////////////////////////////////////////////////////////////////
    // duplcate method requirde

    this.init = function (world) {
        this.setWorld(world);

        // set up the shader
        this._shader = new RDGE.jshader();
        this._shader.def = linearGradientMaterialDef;
        this._shader.init();

        // set up the material node
        this._materialNode = RDGE.createMaterialNode(this.getShaderName() + "_" + world.generateUniqueNodeID());
        this._materialNode.setShader(this._shader);


        if (this._shader && this._shader['default'])
            this._shader['default'].u_texTransform.set( this._textureTransform );


        // send the current values to the shader
        this.setShaderValues();
        this.update( 0 );
    };

	this.resetToDefault = function()
	{
		this._propValues[this._propNames[0]] = this._color1.slice(0);
		this._propValues[this._propNames[1]] = this._color2.slice(0);
		this._propValues[this._propNames[2]] = this._color3.slice(0);
		this._propValues[this._propNames[3]] = this._color4.slice(0);

		this._propValues[this._propNames[4]] = this._colorStop1;
		this._propValues[this._propNames[5]] = this._colorStop2;
		this._propValues[this._propNames[6]] = this._colorStop3;
		this._propValues[this._propNames[7]] = this._colorStop4;

		this._propValues[this._propNames[8]] = [ Math.cos(this._angle), Math.sin(this._angle) ];

		var nProps = this._propNames.length;
		for (var i=0; i<nProps;  i++) {
			this.setProperty( this._propNames[i],  this._propValues[this._propNames[i]]  );
		}
	};

    // Only Linear Gradient and Radial Gradients support gradients;
    this.gradientType = "linear";

    this.getGradientData = function() {
        var angle = Math.round(this._angle*180/Math.PI),
            color,
            colorStr,
            css = "-webkit-gradient(linear, " + angle + "deg";

        // TODO - Angle is not supported in -webkit-gradient syntax, so just default to across:
        css = '-webkit-gradient(linear, left top, right top';

        // TODO - Also, Color Model requires from and to in the gradient string
        color = this.getProperty('u_color1');
        colorStr = Math.round(color[0] * 255) + ', ' + Math.round(color[1] * 255) + ', ' + Math.round(color[2] * 255) + ', ' + Math.round(color[3] * 100);
        css += ', from(rgba(' + colorStr + '))';

        for (var i=2; i < 4; i++) {
            color = this.getProperty('u_color'+i);
            colorStr = Math.round(color[0] * 255) + ', ' + Math.round(color[1] * 255) + ', ' + Math.round(color[2] * 255) + ', ' + Math.round(color[3] * 100);
            css += ', color-stop(' + this.getProperty('u_colorStop'+i) + ', rgba(' + colorStr + '))';
        }

        color = this.getProperty('u_color4');
        colorStr = Math.round(color[0] * 255) + ', ' + Math.round(color[1] * 255) + ', ' + Math.round(color[2] * 255) + ', ' + Math.round(color[3] * 100);
        css += ', to(rgba(' + colorStr + '))';

        css += ')';

        return css;
	};

    // Only Linear Gradient and Radial Gradient have gradient data.
    this.setGradientData = function(colors) {
        var len = colors.length;
        // TODO - Current shaders only support 4 color stops
        if (len > 4) {
            len = 4;
        }

        for (var n = 0; n < len; n++) {
            var position = colors[n].position/100;
            var cs = colors[n].value;
            var stop = [cs.r/255, cs.g/255, cs.b/255, cs.a];

            this.setProperty("u_color" + (n + 1), stop.slice(0));
            this.setProperty("u_colorStop" + (n + 1), position);
        }
    };
};

///////////////////////////////////////////////////////////////////////////////////////
// RDGE shader

// shader spec (can also be loaded from a .JSON file, or constructed at runtime)
var linearGradientMaterialDef =
{'shaders':
    {
            // shader file
            'defaultVShader':"assets/shaders/linearGradient.vert.glsl",
            'defaultFShader':"assets/shaders/linearGradient.frag.glsl",

            // this shader is inline
            'dirLightVShader': "\
                uniform mat4 u_mvMatrix;\
                uniform mat4 u_normalMatrix;\
                uniform mat4 u_projMatrix;\
                uniform mat4 u_worldMatrix;\
                attribute vec3  a_pos;\
                attribute vec3  a_nrm;\
                varying vec3 vNormal;\
                varying vec3 vPos;\
                void main() {\
                    vNormal.xyz = (u_normalMatrix*vec4(a_nrm, 0.0)).xyz;\
                    gl_Position = u_projMatrix * u_mvMatrix * vec4(a_pos,1.0);\
                    vPos = (u_worldMatrix * vec4(a_pos,1.0)).xyz;\
                }",
            'dirLightFShader': "\
                precision highp float;\
                uniform vec4 u_light1Diff;\
                uniform vec3 u_light1Pos;\
                uniform vec4 u_light2Diff;\
                uniform vec3 u_light2Pos;\
                varying vec3 vNormal;\
                varying vec3 vPos;\
                void main() {\
                    vec3 light1 = vec3(u_light1Pos.x - vPos.x, u_light1Pos.y - vPos.y, u_light1Pos.z - vPos.z);\
                    vec3 light2 = vec3(u_light2Pos.x - vPos.x, u_light2Pos.y - vPos.y, u_light2Pos.z - vPos.z);\
                    float t = 0.75;\
                    float range = t*t;\
                    float alpha1 = max(0.0, 1.0 - ( (light1.x*light1.x)/range + (light1.y*light1.y)/range + (light1.z*light1.z)/range));\
                    float alpha2 = max(0.0, 1.0 - ( (light2.x*light2.x)/range + (light2.y*light2.y)/range + (light2.z*light2.z)/range));\
                    gl_FragColor = vec4((u_light2Diff*alpha2 + u_light1Diff*alpha1).rgb, 1.0);\
                }"
        },
        'techniques':
        {
            'default':
            [
                {
                    'vshader' : 'defaultVShader',
                    'fshader' : 'defaultFShader',
                    // attributes
                    'attributes' :
                    {
                        'vert'  :   { 'type' : 'vec3' },
                        'normal' :  { 'type' : 'vec3' },
                        'texcoord'  :   { 'type' : 'vec2' }
                    },
                    // parameters
                    'params' :
                    {
                        'u_color1' :        { 'type' : 'vec4' },
                        'u_color2' :        { 'type' : 'vec4' },
                        'u_color3' :        { 'type' : 'vec4' },
                        'u_color4' :        { 'type' : 'vec4' },
                        'u_colorStop1':     { 'type' : 'float' },
                        'u_colorStop2':     { 'type' : 'float' },
                        'u_colorStop3':     { 'type' : 'float' },
                        'u_colorStop4':     { 'type' : 'float' },
                        'u_cos_sin_angle':  { 'type' : 'vec2' },
                        'u_texTransform':   { 'type' : 'mat3' }
                        //'u_colorCount':       {'type' : 'int' }

                    },

                    // render states
                    'states' :
                    {
                        'depthEnable' : true,
                        'offset':[1.0, 0.1]
                    }
                },
                {   // light pass
                    'vshader' : 'dirLightVShader',
                    'fshader' : 'dirLightFShader',
                    // attributes
                    'attributes' :
                    {
                        'a_pos' :   { 'type' : 'vec3' },
                        'a_nrm' :   { 'type' : 'vec3' }
                    },
                    // parameters
                    'params' :
                    {
                    },

                    // render states
                    'states' :
                    {
                        'depthEnable' : true,
                        "blendEnable" : true,
                        "srcBlend" : "SRC_ALPHA",
                        "dstBlend" : "DST_ALPHA"
                    }
                }
            ]
        }
};

LinearGradientMaterial.prototype = new Material();

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