function TrimModifier(){
}
extendPrototype([ShapeModifier], TrimModifier);
TrimModifier.prototype.initModifierProperties = function(elem, data) {
    this.s = PropertyFactory.getProp(elem, data.s, 0, 0.01, this);
    this.e = PropertyFactory.getProp(elem, data.e, 0, 0.01, this);
    this.o = PropertyFactory.getProp(elem, data.o, 0, 0, this);
    this.sValue = 0;
    this.eValue = 0;
    this.getValue = this.processKeys;
    this.m = data.m;
    this._isAnimated = !!this.s.effectsSequence.length || !!this.e.effectsSequence.length || !!this.o.effectsSequence.length;
};

TrimModifier.prototype.addShapeToModifier = function(shapeData){
    shapeData.pathsData = [];
};

TrimModifier.prototype.calculateShapeEdges = function(s, e, shapeLength, addedLength, totalModifierLength) {
    var segments = [];
    if (e <= 1) {
        segments.push({
            s: s,
            e: e
        });
    } else if (s >= 1) {
        segments.push({
            s: s - 1,
            e: e - 1
        });
    } else {
        segments.push({
            s: s,
            e: 1
        });
        segments.push({
            s: 0,
            e: e - 1
        });
    }
    var shapeSegments = [];
    var i, len = segments.length, segmentOb;
    for (i = 0; i < len; i += 1) {
        segmentOb = segments[i];
        if (segmentOb.e * totalModifierLength < addedLength || segmentOb.s * totalModifierLength > addedLength + shapeLength) {
            
        } else {
            var shapeS, shapeE;
            if (segmentOb.s * totalModifierLength <= addedLength) {
                shapeS = 0;
            } else {
                shapeS = (segmentOb.s * totalModifierLength - addedLength) / shapeLength;
            }
            if(segmentOb.e * totalModifierLength >= addedLength + shapeLength) {
                shapeE = 1;
            } else {
                shapeE = ((segmentOb.e * totalModifierLength - addedLength) / shapeLength);
            }
            shapeSegments.push([shapeS, shapeE]);
        }
    }
    if (!shapeSegments.length) {
        shapeSegments.push([0, 0]);
    }
    return shapeSegments;
};

TrimModifier.prototype.releasePathsData = function(pathsData) {
    var i, len = pathsData.length;
    for (i = 0; i < len; i += 1) {
        segments_length_pool.release(pathsData[i]);
    }
    pathsData.length = 0;
    return pathsData;
};

TrimModifier.prototype.processShapes = function(_isFirstFrame) {
    var s, e;
    if (this._mdf || _isFirstFrame) {
        var o = (this.o.v % 360) / 360;
        if (o < 0) {
            o += 1;
        }
        s = (this.s.v > 1 ? 1 : this.s.v < 0 ? 0 : this.s.v) + o;
        e = (this.e.v > 1 ? 1 : this.e.v < 0 ? 0 : this.e.v) + o;
        if (s === e) {

        }
        if (s > e) {
            var _s = s;
            s = e;
            e = _s;
        }
        s = Math.round(s * 10000) * 0.0001;
        e = Math.round(e * 10000) * 0.0001;
        this.sValue = s;
        this.eValue = e;
    } else {
        s = this.sValue;
        e = this.eValue;
    }
    var shapePaths;
    var i, len = this.shapes.length, j, jLen;
    var pathsData, pathData, totalShapeLength, totalModifierLength = 0;

    if (e === s) {
        for (i = 0; i < len; i += 1) {
            this.shapes[i].localShapeCollection.releaseShapes();
            this.shapes[i].shape._mdf = true;
            this.shapes[i].shape.paths = this.shapes[i].localShapeCollection;
            if (this._mdf) {
                this.shapes[i].pathsData.length = 0;
            }
        }
    } else if (!((e === 1 && s === 0) || (e===0 && s === 1))){
        var segments = [], shapeData, localShapeCollection;
        for (i = 0; i < len; i += 1) {
            shapeData = this.shapes[i];
            // if shape hasn't changed and trim properties haven't changed, cached previous path can be used
            if (!shapeData.shape._mdf && !this._mdf && !_isFirstFrame && this.m !== 2) {
                shapeData.shape.paths = shapeData.localShapeCollection;
            } else {
                shapePaths = shapeData.shape.paths;
                jLen = shapePaths._length;
                totalShapeLength = 0;
                if (!shapeData.shape._mdf && shapeData.pathsData.length) {
                    totalShapeLength = shapeData.totalShapeLength;
                } else {
                    pathsData = this.releasePathsData(shapeData.pathsData);
                    for (j = 0; j < jLen; j += 1) {
                        pathData = bez.getSegmentsLength(shapePaths.shapes[j]);
                        pathsData.push(pathData);
                        totalShapeLength += pathData.totalLength;
                    }
                    shapeData.totalShapeLength = totalShapeLength;
                    shapeData.pathsData = pathsData;
                }

                totalModifierLength += totalShapeLength;
                shapeData.shape._mdf = true;
            }
        }
        var shapeS = s, shapeE = e, addedLength = 0, edges;
        for (i = len - 1; i >= 0; i -= 1) {
            shapeData = this.shapes[i];
            if (shapeData.shape._mdf) {
                localShapeCollection = shapeData.localShapeCollection;
                localShapeCollection.releaseShapes();
                //if m === 2 means paths are trimmed individually so edges need to be found for this specific shape relative to whoel group
                if (this.m === 2 && len > 1) {
                    edges = this.calculateShapeEdges(s, e, shapeData.totalShapeLength, addedLength, totalModifierLength);
                    addedLength += shapeData.totalShapeLength;
                } else {
                    edges = [[shapeS, shapeE]];
                }
                jLen = edges.length;
                for (j = 0; j < jLen; j += 1) {
                    shapeS = edges[j][0];
                    shapeE = edges[j][1];
                    segments.length = 0;
                    if (shapeE <= 1) {
                        segments.push({
                            s:shapeData.totalShapeLength * shapeS,
                            e:shapeData.totalShapeLength * shapeE
                        });
                    } else if (shapeS >= 1) {
                        segments.push({
                            s:shapeData.totalShapeLength * (shapeS - 1),
                            e:shapeData.totalShapeLength * (shapeE - 1)
                        });
                    } else {
                        segments.push({
                            s:shapeData.totalShapeLength * shapeS,
                            e:shapeData.totalShapeLength
                        });
                        segments.push({
                            s:0,
                            e:shapeData.totalShapeLength * (shapeE - 1)
                        });
                    }
                    var newShapesData = this.addShapes(shapeData,segments[0]);
                    if (segments[0].s !== segments[0].e) {
                        if (segments.length > 1) {
                            var lastShapeInCollection = shapeData.shape.paths.shapes[shapeData.shape.paths._length - 1];
                            if (lastShapeInCollection.c) {
                                var lastShape = newShapesData.pop();
                                this.addPaths(newShapesData, localShapeCollection);
                                newShapesData = this.addShapes(shapeData, segments[1], lastShape);
                            } else {
                                this.addPaths(newShapesData, localShapeCollection);
                                newShapesData = this.addShapes(shapeData, segments[1]);
                            }
                        } 
                        this.addPaths(newShapesData, localShapeCollection);
                    }
                    
                }
                shapeData.shape.paths = localShapeCollection;
            }
        }
    } else if (this._mdf) {
        for (i = 0; i < len; i += 1) {
            //Releasign Trim Cached paths data when no trim applied in case shapes are modified inbetween.
            //Don't remove this even if it's losing cached info.
            this.shapes[i].pathsData.length = 0;
            this.shapes[i].shape._mdf = true;
        }
    }
};

TrimModifier.prototype.addPaths = function(newPaths, localShapeCollection) {
    var i, len = newPaths.length;
    for (i = 0; i < len; i += 1) {
        localShapeCollection.addShape(newPaths[i]);
    }
};

TrimModifier.prototype.addSegment = function(pt1, pt2, pt3, pt4, shapePath, pos, newShape) {
    shapePath.setXYAt(pt2[0], pt2[1], 'o', pos);
    shapePath.setXYAt(pt3[0], pt3[1], 'i', pos + 1);
    if(newShape){
        shapePath.setXYAt(pt1[0], pt1[1], 'v', pos);
    }
    shapePath.setXYAt(pt4[0], pt4[1], 'v', pos + 1);
};

TrimModifier.prototype.addSegmentFromArray = function(points, shapePath, pos, newShape) {
    shapePath.setXYAt(points[1], points[5], 'o', pos);
    shapePath.setXYAt(points[2], points[6], 'i', pos + 1);
    if(newShape){
        shapePath.setXYAt(points[0], points[4], 'v', pos);
    }
    shapePath.setXYAt(points[3], points[7], 'v', pos + 1);
};

TrimModifier.prototype.addShapes = function(shapeData, shapeSegment, shapePath) {
    var pathsData = shapeData.pathsData;
    var shapePaths = shapeData.shape.paths.shapes;
    var i, len = shapeData.shape.paths._length, j, jLen;
    var addedLength = 0;
    var currentLengthData,segmentCount;
    var lengths;
    var segment;
    var shapes = [];
    var initPos;
    var newShape = true;
    if (!shapePath) {
        shapePath = shape_pool.newElement();
        segmentCount = 0;
        initPos = 0;
    } else {
        segmentCount = shapePath._length;
        initPos = shapePath._length;
    }
    shapes.push(shapePath);
    for (i = 0; i < len; i += 1) {
        lengths = pathsData[i].lengths;
        shapePath.c = shapePaths[i].c;
        jLen = shapePaths[i].c ? lengths.length : lengths.length + 1;
        for (j = 1; j < jLen; j +=1) {
            currentLengthData = lengths[j-1];
            if (addedLength + currentLengthData.addedLength < shapeSegment.s) {
                addedLength += currentLengthData.addedLength;
                shapePath.c = false;
            } else if(addedLength > shapeSegment.e) {
                shapePath.c = false;
                break;
            } else {
                if (shapeSegment.s <= addedLength && shapeSegment.e >= addedLength + currentLengthData.addedLength) {
                    this.addSegment(shapePaths[i].v[j - 1], shapePaths[i].o[j - 1], shapePaths[i].i[j], shapePaths[i].v[j], shapePath, segmentCount, newShape);
                    newShape = false;
                } else {
                    segment = bez.getNewSegment(shapePaths[i].v[j - 1], shapePaths[i].v[j], shapePaths[i].o[j - 1], shapePaths[i].i[j], (shapeSegment.s - addedLength)/currentLengthData.addedLength,(shapeSegment.e - addedLength)/currentLengthData.addedLength, lengths[j-1]);
                    this.addSegmentFromArray(segment, shapePath, segmentCount, newShape);
                    // this.addSegment(segment.pt1, segment.pt3, segment.pt4, segment.pt2, shapePath, segmentCount, newShape);
                    newShape = false;
                    shapePath.c = false;
                }
                addedLength += currentLengthData.addedLength;
                segmentCount += 1;
            }
        }
        if (shapePaths[i].c && lengths.length) {
            currentLengthData = lengths[j - 1];
            if (addedLength <= shapeSegment.e) {
                var segmentLength = lengths[j - 1].addedLength;
                if (shapeSegment.s <= addedLength && shapeSegment.e >= addedLength + segmentLength) {
                    this.addSegment(shapePaths[i].v[j - 1], shapePaths[i].o[j - 1], shapePaths[i].i[0], shapePaths[i].v[0], shapePath, segmentCount, newShape);
                    newShape = false;
                } else {
                    segment = bez.getNewSegment(shapePaths[i].v[j - 1], shapePaths[i].v[0], shapePaths[i].o[j - 1], shapePaths[i].i[0], (shapeSegment.s - addedLength) / segmentLength, (shapeSegment.e - addedLength) / segmentLength, lengths[j - 1]);
                    this.addSegmentFromArray(segment, shapePath, segmentCount, newShape);
                    // this.addSegment(segment.pt1, segment.pt3, segment.pt4, segment.pt2, shapePath, segmentCount, newShape);
                    newShape = false;
                    shapePath.c = false;
                }
            } else {
                shapePath.c = false;
            }
            addedLength += currentLengthData.addedLength;
            segmentCount += 1;
        }
        if (shapePath._length) {
            shapePath.setXYAt(shapePath.v[initPos][0], shapePath.v[initPos][1], 'i', initPos);
            shapePath.setXYAt(shapePath.v[shapePath._length - 1][0], shapePath.v[shapePath._length - 1][1],'o', shapePath._length - 1);
        }
        if (addedLength > shapeSegment.e) {
            break;
        }
        if (i < len - 1) {
            shapePath = shape_pool.newElement();
            newShape = true;
            shapes.push(shapePath);
            segmentCount = 0;
        }
    }
    return shapes;
};


ShapeModifiers.registerModifier('tm', TrimModifier);