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///////////////////////////////////////////////////////////////////////
// Class HitRecord
//
///////////////////////////////////////////////////////////////////////
var viewUtils = require("js/helper-classes/3D/view-utils").ViewUtils;
var snapManager = require("js/helper-classes/3D/snap-manager");
var Snap2DRecord = exports.Snap2DRecord = Object.create(Object.prototype,
{
    ///////////////////////////////////////////////////////////////////////
    // Constant definitions
    ///////////////////////////////////////////////////////////////////////

    ///////////////////////////////////////////////////////////////////////
    // Instance variables
    ///////////////////////////////////////////////////////////////////////
    _elt : { value: null , writable: true},             // the four boundary points for the element in global screen space
    _screenPtArray : { value: null , writable: true},   // snap point in global screen space
    _alignPtArray : { value: null , writable: true},        // points for snap-align.  Kept in working plane space

    _localToGlobalMat : { value: null, writable: true },
    _globalToLocalMat : { value: null, writable: true },

    // indices to the extremal align points
    _xMinArray : { value: [], writable: true },
    _xMaxArray : { value: [] , writable: true},
    _yMinArray : { value: [] , writable: true},
    _yMaxArray : { value: [] , writable: true},

    ///////////////////////////////////////////////////////////////////////
    // Property accessors
    ///////////////////////////////////////////////////////////////////////
    getElement: { value: function()         {  return this._elt;                    }},
    setElement: { value: function()         {  this._elt = e;                       }},

    getScreenPointArray: { value: function()            {  return this._screenPtArray;          }},
    getAlignPointArray: { value: function()         {  return this._alignPtArray;           }},

    getLocalToGlobalMatrix: { value: function()         {  return this._localToGlobalMat;       }},
    setLocalToGlobalMatrix: { value: function()         {  this._localToGlobalMat = l2g.slice(0);   }},

    getGlobalToLocalMatrix: { value: function()         {  return this._globalToLocalMat;       }},
    setGlobalToLocalMatrix: { value: function()         {  this._globalToLocalMat = g2l.slice(0);   }},

    ///////////////////////////////////////////////////////////////////////
    // Methods
    ///////////////////////////////////////////////////////////////////////
    init: {
        value: function( elt ) {
            this._elt = elt;
            var bounds = viewUtils.getElementViewBounds3D( elt );

            // get the screen and align points from the bounds
            this._screenPtArray = new Array();
            this._alignPtArray  = new Array();
            this._localToGlobalMat = viewUtils.getLocalToGlobalMatrix( elt );
            //this._globalToLocalMat = this._localToGlobalMat.inverse();
            this._globalToLocalMat = glmat4.inverse( this._localToGlobalMat, []);
            for (var i=0;  i<4;  i++)
            {
                this._screenPtArray[i] = viewUtils.localToGlobal( bounds[i],  elt );
                var worldPt = viewUtils.localToStageWorld( bounds[i], elt );
                this._alignPtArray[i] = MathUtils.transformPoint( worldPt, snapManager.SnapManager._worldToDragPlane );

                //////////////////////////////////////////////////////////////////////
                // DEBUG CODE
                var tmp = MathUtils.transformHomogeneousPoint( bounds[i], this._localToGlobalMat );
                tmp = MathUtils.applyHomogeneousCoordinate( tmp );
                if (!MathUtils.pointsEqual( 3,  tmp, this._screenPtArray[i] ))
                    console.log( "**** Snap2DRecord cache screen points do not agree **** " + tmp + " => " + this._screenPtArray[i] );
                //////////////////////////////////////////////////////////////////////
            }

            // add the center point
            var xCtr = 0.5*(bounds[0][0] + bounds[3][0]),  yCtr = 0.5*(bounds[0][1] + bounds[1][1]);
            var ctr = [xCtr, yCtr, 0];
            this._screenPtArray[4] = viewUtils.localToGlobal( ctr,  elt );
            var worldPt = viewUtils.localToStageWorld( ctr, elt );
            this._alignPtArray[4] = MathUtils.transformPoint( worldPt, snapManager.SnapManager._worldToDragPlane );

            // set up the align points
            this.initAlignExtremalPoints()
        }
    },

    initAlignExtremalPoints: {
        value: function() {
            var xMinArray = [0],  xMaxArray = [0],
                yMinArray = [0],  yMaxArray = [0];
            var alignPts = this._alignPtArray;
            var xMin = alignPts[0][0],  xMax = alignPts[0][0],
                yMin = alignPts[0][1],  yMax = alignPts[0][1];
            var sign;
            for (var i=1;  i<4;  i++)
            {
                var pt = alignPts[i];
                sign = MathUtils.fpCmp(pt[0], xMin);  if (sign < 0)  { xMinArray = [i];  xMin = pt[0]; }  else if (sign == 0)  xMinArray.push(i);
                sign = MathUtils.fpCmp(pt[0], xMax);  if (sign > 0)  { xMaxArray = [i];  xMax = pt[0]; }  else if (sign == 0)  xMaxArray.push(i);
                sign = MathUtils.fpCmp(pt[1], yMin);  if (sign < 0)  { yMinArray = [i];  yMin = pt[1]; }  else if (sign == 0)  yMinArray.push(i);
                sign = MathUtils.fpCmp(pt[1], yMax);  if (sign > 0)  { yMaxArray = [i];  yMax = pt[1]; }  else if (sign == 0)  yMaxArray.push(i);
            }
            this._xMinArray = xMinArray;
            this._xMaxArray = xMaxArray;
            this._yMinArray = yMinArray;
            this._yMaxArray = yMaxArray;
        }
    },

    getScreenPoint: {
        value: function( index ) {
            var rtnPt;
            if ((index >= 0) && (index < 4) && (this._screenPtArray != null))
                rtnPt = this._screenPtArray[index].slice(0);

            return rtnPt;
        }
    },

    addAlignPoint: {
        value: function( pt ) {
            this._alignPtArray.push( pt );
        }
    }
});