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///////////////////////////////////////////////////////////////////////
// Class HitRecord
//
///////////////////////////////////////////////////////////////////////

var viewUtils = require("js/helper-classes/3D/view-utils").ViewUtils;
var vecUtils = require("js/helper-classes/3D/vec-utils").VecUtils;
var drawUtils = require("js/helper-classes/3D/draw-utils").DrawUtils;
var snapManagerModule = require("js/helper-classes/3D/snap-manager");

var HitRecord = exports.HitRecord = Object.create(Object.prototype,
{

    ///////////////////////////////////////////////////////////////////////
    // Constant definitions
    ///////////////////////////////////////////////////////////////////////
    SNAP_TYPE_STAGE : { value: 1, writable: true },
    SNAP_TYPE_GRID_VERTEX : { value: 2, writable: true },
    SNAP_TYPE_GRID_HORIZONTAL : { value: 13, writable: true },
    SNAP_TYPE_GRID_VERTICAL: { value: 14, writable: true },
    SNAP_TYPE_ALIGN_MERGED: { value: 15, writable: true },
    SNAP_TYPE_HORIZONTAL_FROM_START: { value: 3, writable: true },
    SNAP_TYPE_VERTICAL_FROM_START: { value: 4, writable: true },
    SNAP_TYPE_ELEMENT: { value: 5, writable: true },
    SNAP_TYPE_ELEMENT_EDGE: { value: 6, writable: true },
    SNAP_TYPE_ELEMENT_VERTEX: { value: 7, writable: true },
    SNAP_TYPE_ALIGN_HORIZONTAL: { value: 8, writable: true },
    SNAP_TYPE_ALIGN_VERTICAL: { value: 9, writable: true },
    SNAP_TYPE_ALIGN_BOTH: { value: 10, writable: true },
    SNAP_TYPE_ELEMENT_CENTER: { value: 11, writable: true },
    SNAP_TYPE_CONTAINED_ELEMENT: { value: 12, writable: true },
    SNAP_TYPE_UNDEFINED: { value: null, writable: -1 },

    ///////////////////////////////////////////////////////////////////////
    // Instance variables
    ///////////////////////////////////////////////////////////////////////
    _type: { value: this.SNAP_TYPE_UNDEFINED, writable: true },
    _elt: { value: null, writable: true },              // this can be null.  example: snapping to the working plane
    _screenPt: { value: null, writable: true },     // snap point in global screen space
    _localPoint: { value: null, writable: true },       // snap point in the local space of the element
    _plane: { value: null, writable: true },        // plane equation at the snap point in local object space
    _planeMat: { value: Matrix.I(4) , writable: true },         // transform to take the point from plane space to the transformed view space of the element
    _assocScrPt: { value: null, writable: true },       // associated screen point
    _assocScrPt2: { value: null, writable: true },      // a second associated point for drawing multiple snap align hits
    _planarHit: { value: false, writable: true },
    _snapBoundaryIndex : { value: -1, writable: true },     // this used for snap align to object boundaries
    _isQuadPt :{ value: false, writable: true },    // used for snapping to an object's quadrant point

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

    getZIndex : { value: function()         {  return this._zIndex; }},
    setZIndex : { value: function(i)            {  this._zIndex = i;                    }},

    setScreenPoint : { value: function(s)           {  this._screenPt = s.slice(0);         }},
    getScreenPoint : { value: function()            {  return this._screenPt.slice(0);      }},

    setLocalPoint : { value: function(s)            {  this._localPt = s.slice(0);          }},
    getLocalPoint : { value:  function()            {  return this._localPt.slice(0);       }},

    setAssociatedScreenPoint : { value: function(s)         {  this._assocScrPt = s.slice(0);       }},
    getAssociatedScreenPoint : { value: function()          {  return this._assocScrPt.slice(0);    }},
    hasAssociatedScreenPoint : { value: function()          {  return this._assocScrPt != null;     }},

    setAssociatedScreenPoint2 : { value: function(s)            {  this._assocScrPt2 = s.slice(0);      }},
    getAssociatedScreenPoint2 : { value: function()         {  return this._assocScrPt2.slice(0);   }},
    hasAssociatedScreenPoint2 : { value: function()         {  return this._assocScrPt2 != null;    }},

    setPlane : { value: function(p)         {  this._plane = p.slice(0);            }},
    getPlane : { value: function()          {  return this._plane.slice(0);         }},

    setPlaneMatrix : { value: function(pm)          {  this._planeMat = pm.slice(0);        }},
    getPlaneMatrix : { value: function()            {  return this._planeMat.slice(0);      }},

    setPlanarHit : { value:  function(p)            {  this._planarHit = p;                 }},
    isPlanarHit : { value: function()           {  return this._planarHit;              }},

    getSnapBoundaryIndex : { value: function()          {  return this._snapBoundaryIndex;      }},
    setSnapBoundaryIndex : { value: function(i)         {  this._snapBoundaryIndex = i;         }},

    getType : { value: function()           {  return this._type;                   }},
    setType : { value: function(t)          {this._type = t;  if (!this.checkType())  { throw new Error("invalid snap type");  return;  }   }},

    getUseQuadPoint : { value: function()           {  return this._isQuadPt;               }},
    setUseQuadPoint : { value: function(q)          {this._isQuadPt = q;                    }},

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

    checkType :{
        value: function()   {
            var ok = false;
            switch (this._type)
            {
                case this.SNAP_TYPE_STAGE:
                //case this.SNAP_TYPE_GRID:
                case this.SNAP_TYPE_GRID_VERTEX:
                case this.SNAP_TYPE_GRID_HORIZONTAL:
                case this.SNAP_TYPE_GRID_VERTICAL:
                case this.SNAP_TYPE_HORIZONTAL_FROM_START:
                case this.SNAP_TYPE_VERTICAL_FROM_START:
                    ok = true;
                    break;

                case this.SNAP_TYPE_ALIGN_MERGED:
                    ok = true;
                    break;

                case this.SNAP_TYPE_ELEMENT:
                case this.SNAP_TYPE_ELEMENT_EDGE:
                case this.SNAP_TYPE_ELEMENT_VERTEX:
                case this.SNAP_TYPE_ELEMENT_CENTER:
                case this.SNAP_TYPE_CONTAINED_ELEMENT:
                    ok = true;
                    break;

                case this.SNAP_TYPE_ALIGN_HORIZONTAL:
                case this.SNAP_TYPE_ALIGN_VERTICAL:
                case this.SNAP_TYPE_ALIGN_BOTH:
                    ok = true;
                    break;
            }

            return ok;
        }
    },

    isSomeGridTypeSnap : {
        value: function() {
            return ((this._type == this.SNAP_TYPE_GRID_VERTEX) ||
                    (this._type == this.SNAP_TYPE_GRID_HORIZONTAL) ||
                    (this._type == this.SNAP_TYPE_GRID_VERTICAL)
                   );
        }
    },

    convertToWorkingPlane : {
        value: function( wp ) {
            var swp = this.calculateStageWorldPoint();
            var wpMat = drawUtils.getPlaneToWorldMatrix(wp, MathUtils.getPointOnPlane(wp));
            //var wpMatInv = wpMat.inverse();
            var wpMatInv = glmat4.inverse( wpMat, []);
            var localPt = MathUtils.transformPoint( swp, wpMatInv );

            //  create a new hit record
            var hr = Object.create(HitRecord);//new HitRecord();
            hr.setType(  this.SNAP_TYPE_STAGE );
            hr.setScreenPoint(  this.getScreenPoint() );
            hr.setLocalPoint(  localPt );
            hr.setPlane( wp );
            hr.setPlaneMatrix( wpMat );
            hr.setElt( snapManagerModule.SnapManager.getStage() );

            return hr;
        }
    },

    calculateStageWorldPoint : {
        value: function() {
            var wPt;
            var elt = this.getElt();
            if (elt != null)
            {
                var localPt = this.getLocalPoint();
                var planeMat = this.getPlaneMatrix();
                wPt = viewUtils.postViewToStageWorld( MathUtils.transformPoint(localPt,planeMat),  elt );
            }

            return wPt;
        }
    },


    calculateScreenPoint : {
        value: function() {
            var scrPt;

            var stage = snapManagerModule.SnapManager.getStage();
            var stageMat = viewUtils.getMatrixFromElement( stage );
            var offset = viewUtils.getElementOffset( stage );
            offset[2] = 0;
            viewUtils.pushViewportObj( stage );

            var elt = this.getElt();
            if (elt != null)
            {
                var localPt = this.getLocalPoint();
                var planeMat = this.getPlaneMatrix();
                scrPt = viewUtils.postViewToStageWorld( MathUtils.transformPoint(localPt,planeMat),  elt );
                scrPt = vecUtils.vecAdd( 3, viewUtils.viewToScreen( MathUtils.transformPoint(scrPt, stageMat) ), offset);
            }
            viewUtils.popViewportObj();

            return scrPt;
        }
    },

    calculateElementWorldPoint : {
        value: function() {
            var localPt = this.getLocalPoint();
            var worldPt = MathUtils.transformPoint( localPt, this.getPlaneMatrix() );

            return worldPt;
        }
    },

    calculateElementScreenPoint : {
        value: function() {
            var worldPt = this.calculateElementWorldPoint();
            viewUtils.pushViewportObj( this._elt );
            var scrPt = viewUtils.viewToScreen( worldPt );
            viewUtils.popViewportObj();

            return scrPt;
        }
    },

    calculateElementScreenToPlane : {
        value: function( scrPt,  plane ) {
            var elt = this.getElt();
            viewUtils.pushViewportObj( elt );
            var viewPt = viewUtils.screenToView( scrPt[0], scrPt[1], scrPt[2] );
            var eyePt;
            if(viewUtils.getPerspectiveDistFromElement(elt))
            {
                eyePt = viewUtils.getEyePoint();
            }
            else
            {
                eyePt = [viewPt[0], viewPt[1], 1400];
            }
            var projPt = MathUtils.vecIntersectPlane( eyePt, MathUtils.vecSubtract(viewPt,eyePt), plane );

            return projPt;
        }
    },

    calculateElementPreTransformScreenPoint : {
        value: function() {
            var localPt = this.getLocalPoint();

            var worldPt = MathUtils.transformPoint( localPt, this.getPlaneMatrix() );
            var mat = viewUtils.getMatrixFromElement( this._elt );
            glmat4.inverse( mat );
            localPt = MathUtils.transformPoint( worldPt, mat );

            viewUtils.pushViewportObj( this._elt );
            var scrPt = viewUtils.viewToScreen( localPt );
            viewUtils.popViewportObj();

            return scrPt;
        }
    },

    getTypeString :{
        value: function()   {
            var str;
            switch (this.getType())
            {
                case this.SNAP_TYPE_STAGE:                      str = "SNAP_TYPE_STAGE";                    break;
                case this.SNAP_TYPE_GRID_VERTEX:                str = "SNAP_TYPE_GRID_VERTEX";              break;
                case this.SNAP_TYPE_GRID_HORIZONTAL:            str = "SNAP_TYPE_GRID_HORIZONTAL";          break;
                case this.SNAP_TYPE_GRID_VERTICAL:              str = "SNAP_TYPE_GRID_VERTICAL";            break;
                case this.SNAP_TYPE_HORIZONTAL_FROM_START:      str = "SNAP_TYPE_HORIZONTAL_FROM_START";    break;
                case this.SNAP_TYPE_VERTICAL_FROM_START:        str = "SNAP_TYPE_VERTICAL_FROM_START";      break;
                case this.SNAP_TYPE_ELEMENT:                    str = "SNAP_TYPE_ELEMENT";                  break;
                case this.SNAP_TYPE_ELEMENT_EDGE:               str = "SNAP_TYPE_ELEMENT_EDGE";             break;
                case this.SNAP_TYPE_ELEMENT_VERTEX:             str = "SNAP_TYPE_ELEMENT_VERTEX";           break;
                case this.SNAP_TYPE_ELEMENT_CENTER:             str = "SNAP_TYPE_ELEMENT_CENTER";           break;
                case this.SNAP_TYPE_CONTAINED_ELEMENT:          str = "SNAP_TYPE_CONTAINED_ELEMENT";        break;
                case this.SNAP_TYPE_ALIGN_HORIZONTAL:           str = "SNAP_TYPE_ALIGN_HORIZONTAL";         break;
                case this.SNAP_TYPE_ALIGN_VERTICAL:             str = "SNAP_TYPE_ALIGN_VERTICAL";           break;
                case this.SNAP_TYPE_ALIGN_BOTH:                 str = "SNAP_TYPE_ALIGN_BOTH";               break;
                case this.SNAP_TYPE_ALIGN_MERGED:               str = "this.SNAP_TYPE_ALIGN_MERGED";        break;

                default:
                    str = "SNAP_TYPE_UNDEFINED";
                    break;
            }

            return str;
        }
    },

    test:
    {
        value: function()
        {
            var elt = this.getElement();
            var stage = viewUtils.getStage();
            if (elt === stage)  return;

            var localPt = this.calculateElementPreTransformScreenPoint();
            var stageWorldPt = this.calculateStageWorldPoint();
            var globalPt = this.getScreenPoint();
            var err = false;

            var test1 = viewUtils.localToGlobal( localPt, elt );
            var dist = vecUtils.vecDist(3, test1, globalPt);
            if (MathUtils.fpSign(dist) != 0)
            {
                err = true;
                console.log( "**** transform error 1 ***** " + dist + ", localPt: " + localPt );
            }

            var stageWorldToGlobal = viewUtils.getStageWorldToGlobalMatrix();
            var test2 = MathUtils.transformAndDivideHomogeneousPoint( stageWorldPt, stageWorldToGlobal );
            dist = vecUtils.vecDist(3, test2, globalPt);
            if (MathUtils.fpSign(dist) != 0)
            {
                err = true;
                console.log( "**** transform error 2 ***** " + dist + ", localPt: " + localPt );
            }

            var localToGlobal = viewUtils.getLocalToGlobalMatrix( elt );
            var globalToLocal = glmat4.inverse( localToGlobal, [] );
            var test3 = MathUtils.transformAndDivideHomogeneousPoint( globalPt, globalToLocal );
            dist = vecUtils.vecDist(3, test3, localPt);
            if (MathUtils.fpSign(dist) != 0)
            {
                err = true;
                console.log( "**** transform error 3 ***** " + dist + ", localPt: " + localPt );
            }

            var objToStageWorld = viewUtils.getObjToStageWorldMatrix( elt, true );
            var test4 = MathUtils.transformAndDivideHomogeneousPoint( localPt, objToStageWorld );
            dist = vecUtils.vecDist(3, test4, stageWorldPt);
            if (MathUtils.fpSign(dist) != 0)
            {
                err = true;
                console.log( "**** transform error 4 ***** " + dist + ", localPt: " + localPt );
            }

            //if (!err)  console.log( "no hitRecord error" );
        }
    }
});