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

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.
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    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
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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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 TagTool = require("js/tools/TagTool").TagTool;
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");
                }
            }
        }
    }

});