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

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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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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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</copyright> */

var ShapeTool = require("js/tools/ShapeTool").ShapeTool;
var ShapesController =  require("js/controllers/elements/shapes-controller").ShapesController;
var DrawingToolBase = require("js/tools/drawing-tool-base").DrawingToolBase;
var defaultEventManager = require("montage/core/event/event-manager").defaultEventManager;
var Montage = require("montage/core/core").Montage;
var NJUtils = require("js/lib/NJUtils").NJUtils;
var ElementMediator = require("js/mediators/element-mediator").ElementMediator;
var snapManager = require("js/helper-classes/3D/snap-manager").SnapManager;
var ViewUtils = require("js/helper-classes/3D/view-utils").ViewUtils;
var BrushStroke = require("js/lib/geom/brush-stroke").BrushStroke;

//whether or not we want the mouse move to be handled all the time (not just while drawing) inside the brush tool
var g_DoBrushToolMouseMove = true;

exports.BrushTool = Montage.create(ShapeTool, {
    hasReel: { value: false },
    _toolID: { value: "brushTool" },
    _imageID: { value: "brushToolImg" },
    _toolImageClass: { value: "brushToolUp" },
    _selectedToolImageClass: { value: "brushToolDown" },
    _toolTipText: { value: "Brush Tool" },
    _brushView: { value: null, writable: true },

    _selectedToolClass: { value: "brushToolSpecificProperties" },
    _penToolProperties: { enumerable: false, value: null, writable: true },
    _parentNode: { enumerable: false, value: null, writable: true },
    _toolsPropertiesContainer: { enumerable: false, value: null, writable: true },

    //config options
    _useWebGL: {value: false, writable: false},

    //view options
    _brushStrokeCanvas: {value: null, writable: true},
    _brushStrokePlaneMat: {value: null, writable: true},
    dragPlane: {value: null, writable: true},

    //the current brush stroke
    _selectedBrushStroke: {value: null, writable: true},

    ShowToolProperties: {
        value: function () {
            this._brushView = PenView.create();
            this._brushView.element = document.getElementById('topPanelContainer').children[0];
            this._brushView.needsDraw = true;
            this._brushView.addEventListener(ToolEvents.TOOL_OPTION_CHANGE, this, false);
        }
    },


    /*
    _getUnsnappedPosition: {
        value: function(x,y){
            var elemSnap = snapManager.elementSnapEnabled();
            var gridSnap = snapManager.gridSnapEnabled();
            var alignSnap = snapManager.snapAlignEnabled();

            snapManager.enableElementSnap(false);
            snapManager.enableGridSnap(false);
            snapManager.enableSnapAlign(false);

            var point = webkitConvertPointFromPageToNode(this.application.ninja.stage.canvas, new WebKitPoint(x,y));
            var unsnappedpos = DrawingToolBase.getHitRecPos(snapManager.snap(point.x, point.y, false));
            this.dragPlane = snapManager.getDragPlane();

            snapManager.enableElementSnap(elemSnap);
            snapManager.enableGridSnap(gridSnap);
            snapManager.enableSnapAlign(alignSnap);

            return unsnappedpos;
        }
    },
    */

    //use the snap manager to build a hit record corresponding to the screen X, Y position
    // will use the plane of the selected path as the working plane if available, else use stage
    getHitRecord:{
        value: function(x,y, doSnap){
            var elemSnap = snapManager.elementSnapEnabled();
            var gridSnap = snapManager.gridSnapEnabled();
            var alignSnap = snapManager.snapAlignEnabled();

            if (!doSnap){
                snapManager.enableElementSnap(false);
                snapManager.enableGridSnap(false);
                snapManager.enableSnapAlign(false);
            }

            if (this._selectedSubpathCanvas){
                var drawingCanvas = this._selectedSubpathCanvas;
                var contentPlane = ViewUtils.getUnprojectedElementPlane(drawingCanvas);
                snapManager.pushWorkingPlane(contentPlane);

            }
            var tmpPoint = webkitConvertPointFromPageToNode(this.application.ninja.stage.canvas, new WebKitPoint(x,y));
            var hitRec = snapManager.snap(tmpPoint.x, tmpPoint.y, false);
            this.dragPlane = snapManager.getDragPlane();
            if (this._selectedSubpathCanvas){
                snapManager.popWorkingPlane();
            }

            if (!doSnap){
                snapManager.enableElementSnap(elemSnap);
                snapManager.enableGridSnap(gridSnap);
                snapManager.enableSnapAlign(alignSnap);
            }
            return hitRec;
        }
    },

    HandleLeftButtonDown: {
         value: function (event) {
             //ignore any right or middle clicks
             if (event.button !== 0) {
                //NOTE: this will work on Webkit only...IE has different codes (left: 1, middle: 4, right: 2)
                return;
             }
             if (this._canDraw) {
                this._isDrawing = true;
             }

             var hitRec = this.getHitRecord(event.pageX, event.pageY, false);
             this._brushStrokePlaneMat = hitRec.getPlaneMatrix();

             //start a new brush stroke
             if (this._selectedBrushStroke === null){
                 this._selectedBrushStroke = new BrushStroke();
                 var colorObj;
                 var fill = this.options.fill;
                 var color = fill.color;
                 if(fill.colorMode === "gradient") {
                     colorObj = {gradientMode:fill.color.gradientMode, color:fill.color.stops};
                 } else if (color) {
                     colorObj = [color.r/255, color.g/255, color.b/255, color.a];
                 } else {
                     colorObj = [1,1,1,0];
                 }
                 this._selectedBrushStroke.setFillColor(colorObj);

                 //add this point to the brush stroke in case the user does a mouse up before doing a mouse move
                 var currMousePos = hitRec.calculateStageWorldPoint();
                 currMousePos[0]+= snapManager.getStageWidth()*0.5;
                 currMousePos[1]+= snapManager.getStageHeight()*0.5;
                 this._selectedBrushStroke.addPoint(currMousePos);

                 var strokeSize = 1;
                 if (this.options.strokeSize) {
                     strokeSize = ShapesController.GetValueInPixels(this.options.strokeSize.value, this.options.strokeSize.units);
                 }
                 this._selectedBrushStroke.setStrokeWidth(strokeSize);

                 var strokeHardness = 100;
                 if (this.options.strokeHardness){
                     strokeHardness = this.options.strokeHardness.value;
                 }
                 this._selectedBrushStroke.setStrokeHardness(strokeHardness);

                 var doSmoothing = false;
                 if (this.options.doSmoothing){
                     doSmoothing = this.options.doSmoothing;
                 }
                 this._selectedBrushStroke.setDoSmoothing(doSmoothing);
                 if (doSmoothing){
                     this._selectedBrushStroke.setSmoothingAmount(this.options.smoothingAmount.value);
                 }

                 var useCalligraphic = false;
                 if (this.options.useCalligraphic){
                     useCalligraphic = this.options.useCalligraphic;
                 }
                 if (useCalligraphic) {
                     this._selectedBrushStroke.setStrokeUseCalligraphic(true);
                     var strokeAngle = 0;
                     if (this.options.strokeAngle){
                         strokeAngle= this.options.strokeAngle.value;
                     }
                     this._selectedBrushStroke.setStrokeAngle(Math.PI * strokeAngle/180);
                 } else {
                     this._selectedBrushStroke.setStrokeUseCalligraphic(false);
                 }

             }
             if (!g_DoBrushToolMouseMove)
                 NJevent("enableStageMove");//stageManagerModule.stageManager.enableMouseMove();
         } //value: function (event) {
     }, //HandleLeftButtonDown

    HandleMouseMove:
    {
        value: function (event) {
            //ignore any right or middle clicks
            if (event.button !== 0) {
               //NOTE: this will work on Webkit only...IE has different codes (left: 1, middle: 4, right: 2)
               return;
            }

            var hitRec = this.getHitRecord(event.pageX, event.pageY, false);
            var currMousePos = hitRec.calculateStageWorldPoint();
            currMousePos[0]+= snapManager.getStageWidth()*0.5;
            currMousePos[1]+= snapManager.getStageHeight()*0.5;
            if (this._isDrawing) {
                if (this._selectedBrushStroke && this._selectedBrushStroke.getNumPoints()<1000){
                   this._selectedBrushStroke.addPoint(currMousePos);
                }
                this.ShowCurrentBrushStrokeOnStage();
            } else {
                this.ShowCurrentBrushIconOnStage(hitRec.getScreenPoint());
            }

            //this.drawLastSnap();        //TODO.. is this line necessary if we're not snapping? // Required cleanup for both Draw/Feedbacks

       }//value: function(event)
    },



    HandleLeftButtonUp: {
        value: function (event) {
            this.endDraw(event);

            this._isDrawing = false;
            this._hasDraw = false;

            //finish giving enough info. to the brush stroke
            if (this._selectedBrushStroke){
                this._selectedBrushStroke.setPlaneMatrix(this._brushStrokePlaneMat);
                this._selectedBrushStroke.setPlaneMatrixInverse(glmat4.inverse(this._brushStrokePlaneMat,[]));
                this._selectedBrushStroke.setDragPlane(this.dragPlane);
            }

            //display the previously drawn stroke in a separate canvas
            this.RenderCurrentBrushStroke();

            this._selectedBrushStroke = null;
            this._brushStrokeCanvas = null;
            if (!g_DoBrushToolMouseMove)
                NJevent("disableStageMove");
        }
    },

    ShowCurrentBrushIconOnStage:{
        value: function(currMousePos) {
            //clear the canvas before we draw anything else
            this.application.ninja.stage.clearDrawingCanvas();
            //display the brush icon of proper size (query the options bar)
            var strokeSize = 1;
            if (this.options.strokeSize) {
                strokeSize = ShapesController.GetValueInPixels(this.options.strokeSize.value, this.options.strokeSize.units);
            }
            var useCalligraphic = false;
            if (this.options.useCalligraphic){
                useCalligraphic = this.options.useCalligraphic;
            }

            var ctx = this.application.ninja.stage.drawingContext;//stageManagerModule.stageManager.drawingContext;
            if (ctx === null)
                throw ("null drawing context in Brushtool::ShowCurrentBrushStrokeOnStage");
            ctx.save();

            var horizontalOffset = 0;//this.application.ninja.stage.userContentLeft;
            var verticalOffset = 0;//this.application.ninja.stage.userContentTop;
            var halfStrokeWidth = 0.5*strokeSize;
            ctx.beginPath();
            if (!useCalligraphic) {
                //for round brushes, draw a circle at the current mouse position
                ctx.arc(currMousePos[0] + horizontalOffset, currMousePos[1]+ verticalOffset, halfStrokeWidth, 0, 2 * Math.PI, false);
            } else {
                //draw an angled stroke to represent the brush tip
                var strokeAngle = 0;
                if (this.options.strokeAngle){
                    strokeAngle= this.options.strokeAngle.value;
                }
                strokeAngle = Math.PI * strokeAngle/180;
                var deltaDisplacement = [Math.cos(strokeAngle),Math.sin(strokeAngle)];
                deltaDisplacement = VecUtils.vecNormalize(2, deltaDisplacement, 1);
                var startPos = VecUtils.vecSubtract(2, currMousePos, [-horizontalOffset+halfStrokeWidth*deltaDisplacement[0],-verticalOffset+halfStrokeWidth*deltaDisplacement[1]]);
                ctx.moveTo(startPos[0], startPos[1]);
                var endPos = VecUtils.vecAdd(2, startPos, [strokeSize*deltaDisplacement[0], strokeSize*deltaDisplacement[1]]);
                ctx.lineTo(endPos[0], endPos[1]);
                ctx.lineWidth = 2;
            }
            ctx.strokeStyle = "black";
            ctx.stroke();
            ctx.restore();
        }
    },

    ShowCurrentBrushStrokeOnStage:{
        value: function() {
            //clear the canvas before we draw anything else
            this.application.ninja.stage.clearDrawingCanvas();
            if (this._selectedBrushStroke && this._selectedBrushStroke.getNumPoints()>0){
                var ctx = this.application.ninja.stage.drawingContext;//stageManagerModule.stageManager.drawingContext;
                if (ctx === null)
                    throw ("null drawing context in Brushtool::ShowCurrentBrushStrokeOnStage");
                ctx.save();

                /*var horizontalOffset = this.application.ninja.stage.userContentLeft;
                var verticalOffset = this.application.ninja.stage.userContentTop;
                var origX = -horizontalOffset;
                var origY = -verticalOffset;*/
                var deltaX = -snapManager.getStageWidth()*0.5;
                var deltaY = -snapManager.getStageHeight()*0.5;
                var swToGlobalMat = ViewUtils.getStageWorldToGlobalMatrix();
                this._selectedBrushStroke.drawToContext(ctx, true, deltaX, deltaY, swToGlobalMat);

                /*
                origX=0;origY=0;

                ctx.lineWidth = 2;
                var numPoints = this._selectedBrushStroke.getNumPoints();
                ctx.beginPath();
                var tempP = this._selectedBrushStroke.getPoint(0);
                tempP[0]-=snapManager.getStageWidth()*0.5;
                tempP[1]-=snapManager.getStageHeight()*0.5;
                var p = MathUtils.transformAndDivideHomogeneousPoint(tempP, swToGlobalMat);
                ctx.moveTo(p[0]-origX, p[1]-origY);
                if (numPoints===1){
                    //display a tiny segment as a single point
                   ctx.lineTo(p[0]-origX, p[1]-origY+0.01);
                }
                for (var i=1;i<numPoints;i++){
                    tempP = this._selectedBrushStroke.getPoint(i);
                    tempP[0]-=snapManager.getStageWidth()*0.5;
                    tempP[1]-=snapManager.getStageHeight()*0.5;
                    p = MathUtils.transformAndDivideHomogeneousPoint(tempP, swToGlobalMat);
                    ctx.lineTo(p[0]-origX, p[1]-origY);
                }
                ctx.stroke();
                */

                ctx.restore();
            }
        }
    },

    RenderCurrentBrushStroke:{
        value: function() {
            if (this._selectedBrushStroke){
                //DEBUGGING
                /*var localData = this._selectedBrushStroke.buildLocalDataFromStageWorldCoord();
                var bboxWidth = localData[1];
                var bboxHeight = localData[2];
                var bboxMid = localData[0];*/
                this._selectedBrushStroke.init();
                var bboxWidth = this._selectedBrushStroke.getWidth();
                var bboxHeight = this._selectedBrushStroke.getHeight();
                var bboxMid = this._selectedBrushStroke.getStageWorldCenter();
                //end DEBUGGING
                //call render shape with the bbox width and height
                this.RenderShape(bboxWidth, bboxHeight, this._brushStrokePlaneMat, bboxMid, this._brushStrokeCanvas);

                /*this._selectedBrushStroke.computeMetaGeometry();
                var bboxMin = this._selectedBrushStroke.getBBoxMin();
                var bboxMax = this._selectedBrushStroke.getBBoxMax();
                var bboxWidth = bboxMax[0] - bboxMin[0];
                var bboxHeight = bboxMax[1] - bboxMin[1];
                var bboxMid = [0.5 * (bboxMax[0] + bboxMin[0]), 0.5 * (bboxMax[1] + bboxMin[1]), 0.5 * (bboxMax[2] + bboxMin[2])];

                this._selectedBrushStroke.setCanvasX(bboxMid[0]);
                this._selectedBrushStroke.setCanvasY(bboxMid[1]);
                //call render shape with the bbox width and height
                this.RenderShape(bboxWidth, bboxHeight, this._brushStrokePlaneMat, bboxMid, this._brushStrokeCanvas);
                */
            }
        }
    },


    RenderShape: {
        value: function (w, h, planeMat, midPt, canvas) {
            if ((Math.floor(w) === 0) || (Math.floor(h) === 0)) {
                return;
            }

            if (!canvas) {
                var newCanvas = document.application.njUtils.make("canvas", {"data-RDGE-id": NJUtils.generateRandom()}, this.application.ninja.currentDocument);
                var styles = document.application.njUtils.stylesFromDraw(newCanvas, w, h, {midPt: midPt, planeMat: planeMat});
                this.application.ninja.elementMediator.addElements(newCanvas, styles, false);

                // create all the GL stuff
                var world = this.getGLWorld(newCanvas, this._useWebGL);
                //store a reference to this newly created canvas
                this._brushStrokeCanvas = newCanvas;

                var brushStroke = this._selectedBrushStroke;
                if (brushStroke){
                    brushStroke.setWorld(world);
                    brushStroke.setCanvas(newCanvas);

                    brushStroke.setPlaneMatrix(planeMat);
                    var planeMatInv = glmat4.inverse( planeMat, [] );
                    brushStroke.setPlaneMatrixInverse(planeMatInv);
                    brushStroke.setPlaneCenter(midPt);

                    world.addObject(brushStroke);
                    world.render();
                    //TODO this will not work if there are multiple shapes in the same canvas
                    newCanvas.elementModel.shapeModel.GLGeomObj = brushStroke;

                    newCanvas.elementModel.shapeModel.shapeCount++;
                    if(newCanvas.elementModel.shapeModel.shapeCount === 1)
                    {
                        newCanvas.elementModel.selection = "BrushStroke";
                        newCanvas.elementModel.pi = "BrushStrokePi";
                        newCanvas.elementModel.shapeModel.strokeSize = this.options.strokeSize.value + " " + this.options.strokeSize.units;

                        newCanvas.elementModel.shapeModel.GLGeomObj = brushStroke;
                        newCanvas.elementModel.shapeModel.useWebGl = this.options.use3D;
                    }
                    else
                    {
                        // TODO - update the shape's info only.  shapeModel will likely need an array of shapes.
                    }

                    //now send the event that will add this canvas to the timeline
                    NJevent("elementAdded", newCanvas);

                    //if(newCanvas.elementModel.isShape)
                    if (true)
                    {
                        this.application.ninja.selectionController.selectElement(newCanvas);
                    }
                }
            } //if (!canvas) {
            else {

                /*
                var world = null;
                if (canvas.elementModel.shapeModel && canvas.elementModel.shapeModel.GLWorld) {
                    world = canvas.elementModel.shapeModel.GLWorld;
                } else {
                    world = this.getGLWorld(canvas, this._useWebGL);
                }


                if (this._entryEditMode !== this.ENTRY_SELECT_CANVAS){
                    //update the left and top of the canvas element
                    var canvasArray=[canvas];
                    ElementMediator.setProperty(canvasArray, "left", [parseInt(left)+"px"],"Changing", "brushTool");
                    ElementMediator.setProperty(canvasArray, "top", [parseInt(top) + "px"],"Changing", "brushTool");
                    canvas.width = w;
                    canvas.height = h;
                    //update the viewport and projection to reflect the new canvas width and height
                    world.setViewportFromCanvas(canvas);
                    if (this._useWebGL){
                        var cam = world.renderer.cameraManager().getActiveCamera();
                        cam.setPerspective(world.getFOV(), world.getAspect(), world.getZNear(), world.getZFar());
                    }
                }

                var brushStroke = this._selectedBrushStroke;

                if (brushStroke){
                    brushStroke.setDrawingTool(this);

                    brushStroke.setPlaneMatrix(planeMat);
                    var planeMatInv = glmat4.inverse( planeMat, [] );
                    brushStroke.setPlaneMatrixInverse(planeMatInv);
                    brushStroke.setPlaneCenter(midPt);

                    brushStroke.setWorld(world);
                    world.addIfNewObject(brushStroke);
                    //world.addObject(subpath);
                    world.render();
                    //TODO this will not work if there are multiple shapes in the same canvas
                    canvas.elementModel.shapeModel.GLGeomObj = brushStroke;
                }
                */
                alert("BrushStroke cannot edit existing canvas");
            } //else of if (!canvas) {
        } //value: function (w, h, planeMat, midPt, canvas) {
    }, //RenderShape: {

    Configure: {
        value: function (wasSelected) {
            if (wasSelected) {
                if (g_DoBrushToolMouseMove){
                    NJevent("enableStageMove");
                }
            }
            else {
                if (g_DoBrushToolMouseMove){
                    NJevent("disbleStageMove");
                }
            }
        }
    }

});