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

var Material = require("js/lib/rdge/materials/material").Material;

var __textureCounter = 0;

///////////////////////////////////////////////////////////////////////
// Class GLTexture
//      GL representation of a texture.
///////////////////////////////////////////////////////////////////////
function Texture( dstWorld, texMapName,  wrap, mips )
{
    ///////////////////////////////////////////////////////////////////////
    // Instance variables
    ///////////////////////////////////////////////////////////////////////
    this._texture;

   // the canvas generating the texture map (if there is one)
    this._srcCanvas;
    this._srcWorld;

    // texture attributes
    if (typeof texMapName === "string")
        this._texMapName = texMapName.slice();
    else
        this._srcCanvas = texMapName;


    // set default values for wrap and mips
    if (wrap === undefined)
        wrap = "REPEAT";
    if (mips === undefined)
        mips = true;
    this._wrap = wrap;
    this._mips = mips;

    // cache whether or not the source is animated
    this._isAnimated = false;

    // the destination world that will use the texture map
    this._dstWorld = dstWorld;

    this._texCount = __textureCounter;
    __textureCounter++;

    ///////////////////////////////////////////////////////////////////////
    // Property Accessors
    ///////////////////////////////////////////////////////////////////////
    this.getTexture     = function()    {  return this._texture;    }

    this.setSrcWorld    = function(w)   {  this._srcWorld = w;      }
    this.getSrcWorld    = function()    {  return this._srcWorld;   }

    this.setDstWorld    = function(w)   {  this._dstWorld = w;      }
    this.getDstWorld    = function()    {  return this._dstWorld;   }

    this.isAnimated     = function()    {  return this._isAnimated; }

    ///////////////////////////////////////////////////////////////////////
    // Methods
    ///////////////////////////////////////////////////////////////////////

    this.init = function()
    {
        // determine if the source is a canvas or an image file
        var viewUtils = require("js/helper-classes/3D/view-utils").ViewUtils;
        //var root = viewUtils.application.ninja.currentDocument.documentRoot;
        var root;
        if (viewUtils.application.ninja.currentDocument)
            root = viewUtils.application.ninja.currentDocument.model.documentRoot;
        var srcCanvas = this._srcCanvas;
        if (!srcCanvas && root)
            srcCanvas = this.findCanvas( this._texMapName, root );
        if (srcCanvas)
        {
            this._srcCanvas = srcCanvas;
            var srcWorld
            if (srcCanvas.elementModel && srcCanvas.elementModel.shapeModel  && srcCanvas.elementModel.shapeModel.GLWorld)
             srcWorld = srcCanvas.elementModel.shapeModel.GLWorld;
            if (!srcWorld)  srcWorld = srcCanvas.__GLWorld;
            if (srcWorld)
            {
                this._srcWorld = srcWorld;

                // add a notifier to the world
                srcWorld.addListener( this,  this.worldCallback,  { srcWorld: this._srcWorld } );

                // check if the source is animated
                this._isAnimated = srcWorld._hasAnimatedMaterials;
            }

            this.loadFromCanvas();
        }
        else
        {
            this.loadFromFile();
        }
    }

    this.worldCallback = function( type, callbackObj,  calleeData,  callerData )
    {
        console.log( "texture callback, type: " + type );
        if (calleeData.srcWorld)
        {
            var srcWorld = callbackObj.getSrcWorld();
            var dstWorld = callbackObj.getDstWorld();
            var notifier = srcWorld._notifier;
            var texture = this.callbackObj;
            if (texture)
            {
                switch (type)
                {
                    case notifier.OBJECT_DELETE:
                        texture.rebuildSrcLocally();
                        break;

                    case notifier.OBJECT_REINSTANTIATE:
                        break;

                    case notifier.OBJECT_CHANGE:
                        break;

                    case notifier.FIRST_RENDER:
                        texture._isAnimated = srcWorld.hasAnimatedMaterials();
                        break;

                    default:
                        throw new Exception( "unrecognized texture callback type: " + type );
                        break;
                }
           }
        }
    }

    this.rebuildSrcLocally = function()
    {
        var srcWorld = this._srcWorld;
        if (srcWorld)
        {
            // get the data from the old world
            var jStr = srcWorld.exportJSON();
            var index = jStr.indexOf( ';' );
            if ((jStr[0] === 'v') && (index < 24))
                jStr = jStr.substr( index+1 );
            var jObj = JSON.parse( jStr );
            var oldCanvas = srcWorld.getCanvas();

            // create a new canvas
            var NJUtils = require("js/lib/NJUtils").NJUtils;
            this._srcCanvas = NJUtils.makeNJElement("canvas", "texture_internal_canvas", "shape", {"data-RDGE-id": NJUtils.generateRandom()}, true);
            srcCanvas = this._srcCanvas;
            srcCanvas.width  = oldCanvas.width;
            srcCanvas.height = oldCanvas.height;

            // rebuild the world
            var GLWorld = require("js/lib/drawing/world").World;
            this._srcWorld = new GLWorld( this._srcCanvas, true, true );
            this._srcWorld.importJSON( jObj );

            this._isLocal = true;
        }
    }

    this.loadFromFile = function()
    {
        var tex = this._texture;
        this._srcCanvas = null;

        // only load if something has changed
        //if (this._texMapName !== texMapName)  // does RDGE allow us to change wrap or mips?
        {
            var texMapName = this._texMapName;
            var wrap = this._wrap;
            var mips = this._mips;

            var dstWorld = this.getDstWorld();
            if (dstWorld)
            {
                var renderer = dstWorld.getRenderer();
                tex = renderer.getTextureByName(texMapName, wrap, mips );
                this._texture = tex;
                dstWorld.textureToLoad( tex );
            }
        }

        return tex;
    }

    var __texCounter = 0;
    this.loadFromCanvas = function()
    {
        var NJUtils = require("js/lib/NJUtils").NJUtils;

        var srcCanvas = this._srcCanvas;
        var wrap = this._wrap;
        var mips = this._mips;

        this._texMapName = "GLTexture_" + __texCounter;
        __texCounter++;

        // create the texture
        var world = this.getDstWorld();
        tex = world.getGLContext().createTexture();
        this._texture = tex;
        tex.texparams = new _texparams(wrap, mips); // defined in renderer.js
        tex.image = new Image;

        // create the canvas and context to render into
        var doc = srcCanvas.ownerDocument;
        //this._renderCanvas = doc.createElement("texture_canvas");
        this._renderCanvas = NJUtils.makeNJElement("canvas", "texture_canvas", "shape", {"data-RDGE-id": NJUtils.generateRandom()}, true);

        this.render();

        return tex;
    }

    this.render = function()
    {
        if (!this._srcCanvas)
            return;
        var srcCanvas = this._srcCanvas;

        if (this._isLocal)
        {
            this._srcWorld.update();
            this._srcWorld.draw();
        }

        var world = this.getDstWorld();
        if (!world)
        {
            console.log( "no world in GLTexture.render" );
            return;
        }
        var renderer = world.getRenderer();

        var width = srcCanvas.width,  height = srcCanvas.height;
        if (!this.isPowerOfTwo(width) || !this.isPowerOfTwo(height))
        {
            width = this.nextLowerPowerOfTwo( width );
            height = this.nextLowerPowerOfTwo( height );
        }

        // create a canvas to be used as the image for the texture map
        var renderCanvas = this._renderCanvas;
        if (!renderCanvas)
        {
            console.log( "no render canvas in GLTexture.render" );
            return;
        }
        renderCanvas.width = width;
        renderCanvas.height = height;
        var renderCtx = renderCanvas.getContext("2d");

        // create the texture
        var tex = this._texture;
        if (!tex)
        {
            console.log( "no texture in GLTexture.render" );
            return;
        }

        // copy the source canvas to the context to be used in the texture
        renderCtx.drawImage(srcCanvas, 0, 0, width, height);
        /*
        renderCtx.fillStyle = "#00000a";
        renderCtx.fillRect(0, 0, width, height );
        var imageData = renderCtx.getImageData(0,0,width, height);
        for (var i=3;  i<imageData.data.length;  i+=4)
        {
            imageData.data[i] = 128;
        }
        */

        /////////////////
        tex.image = renderCanvas;

        renderer.commitTexture( tex );

        return tex;
    }

    this.isPowerOfTwo = function(x)
    {
        return (x & (x - 1)) == 0;
    }

    this.nextHighestPowerOfTwo = function(x)
    {
        --x;
        for (var i = 1; i < 32; i <<= 1) {
            x = x | x >> i;
        }
        return x + 1;
    }

    this.nextLowerPowerOfTwo = function(x)
    {
        return this.nextHighestPowerOfTwo(x) >> 1;
    }

    this.findCanvas = function( id,  elt )
    {
        if (elt.id && elt.id === id)
            return elt;

        if (elt.children)
        {
            var nKids = elt.children.length;
            for (var i=0;  i<nKids;  i++)
            {
                var child = elt.children[i];
                var canvas = this.findCanvas( id, child );
                if (canvas)  return canvas;
            }
        }
   }

   // initialize the object
   this.init();
}

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