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/*
 Copyright (c) 2012-2018 Open Lab
 Written by Roberto Bicchierai and Silvia Chelazzi http://roberto.open-lab.com
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
 "Software"), to deal in the Software without restriction, including
 without limitation the rights to use, copy, modify, merge, publish,
 distribute, sublicense, and/or sell copies of the Software, and to
 permit persons to whom the Software is furnished to do so, subject to
 the following conditions:

 The above copyright notice and this permission notice shall be
 included in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


 todo For compatibility with IE and SVGElements.getElementsByClassName not implemented changed every find starting from SVGElement (the other works fine)
 .find(".classname"))  -> .find("[class*=classname])
 */
function Ganttalendar(startMillis, endMillis, master, minGanttSize) {

    this.master = master; // is the a GantEditor instance
    this.element; // is the jquery element containing gantt

    this.svg; // instance of svg object containing gantt
    this.tasksGroup; //instance of svg group containing tasks
    this.linksGroup; //instance of svg group containing links

    this.minGanttSize = minGanttSize;
    this.includeToday = false; //when true today is always visible. If false boundaries comes from tasks periods
    this.showCriticalPath = false; //when true critical path is highlighted

    this.initZoomlevels(); // initialite the zoom level definitions

    this.originalStartMillis = startMillis;
    this.originalEndMillis = endMillis;
    this.gridChanged = true; //witness for boundaries changed. Force to redraw gantt grid
    this.element = this.createGanttGrid(); // fake

    this.linkOnProgress = false; //set to true when creating a new link

    this.taskHeight = 16;
    this.resizeZoneWidth = 5;
    this.taskVertOffset = (this.master.rowHeight - this.taskHeight) / 2;
}


Ganttalendar.prototype.zoomGantt = function (isPlus) {
    var curLevel = this.zoom;
    var pos = this.zoomLevels.indexOf(curLevel + "");

    var centerMillis = this.getCenterMillis();
    var newPos = pos;
    if (isPlus) {
        newPos = pos <= 0 ? 0 : pos - 1;
    } else {
        newPos = pos >= this.zoomLevels.length - 1 ? this.zoomLevels.length - 1 : pos + 1;
    }
    if (newPos != pos) {
        curLevel = this.zoomLevels[newPos];
        this.gridChanged = true;
        this.zoom = curLevel;

        this.storeZoomLevel();
        this.redraw();
        this.goToMillis(centerMillis);
    }
};


Ganttalendar.prototype.getStoredZoomLevel = function () {
    if (localStorage && localStorage.getObject("TWPGanttSavedZooms")) {
        var savedZooms = localStorage.getObject("TWPGanttSavedZooms");
        return savedZooms[this.master.tasks[0].id];
    }
    return false;
};

Ganttalendar.prototype.storeZoomLevel = function () {
    //console.debug("storeZoomLevel: "+this.zoom);
    if (localStorage) {
        var savedZooms;
        if (!localStorage.getObject("TWPGanttSavedZooms"))
            savedZooms = {};
        else
            savedZooms = localStorage.getObject("TWPGanttSavedZooms");

        savedZooms[this.master.tasks[0].id] = this.zoom;

        localStorage.setObject("TWPGanttSavedZooms", savedZooms);
    }
};

Ganttalendar.prototype.createHeadCell = function (level, zoomDrawer, rowCtx, lbl, span, additionalClass, start, end) {
    var x = (start.getTime() - self.startMillis) * zoomDrawer.computedScaleX;
    var th = $("<th>").html(lbl).attr("colSpan", span);
    if (level > 1) { //set width on second level only
        var w = (end.getTime() - start.getTime()) * zoomDrawer.computedScaleX;
        th.width(w);
    }
    if (additionalClass)
        th.addClass(additionalClass);
    rowCtx.append(th);
};

Ganttalendar.prototype.createBodyCell = function (zoomDrawer, tr, span, isEnd, additionalClass) {
    var ret = $("<td>").html("").attr("colSpan", span).addClass("ganttBodyCell");
    if (isEnd)
        ret.addClass("end");
    if (additionalClass)
        ret.addClass(additionalClass);
    tr.append(ret);
};


Ganttalendar.prototype.createGanttGrid = function () {
    //console.debug("Gantt.createGanttGrid zoom: "+this.zoom +"  " + new Date(this.originalStartMillis).format() + " - " + new Date(this.originalEndMillis).format());
    //var prof = new Profiler("ganttDrawer.createGanttGrid");
    var self = this;

    // get the zoomDrawer
    // if the desired level is not there uses the largest one (last one)
    var zoomDrawer = self.zoomDrawers[self.zoom] || self.zoomDrawers[self.zoomLevels[self.zoomLevels.length - 1]];

    //get best dimension for gantt
    var adjustedStartDate = new Date(this.originalStartMillis);
    var adjustedEndDate = new Date(this.originalEndMillis);
    zoomDrawer.adjustDates(adjustedStartDate, adjustedEndDate);

    self.startMillis = adjustedStartDate.getTime(); //real dimension of gantt
    self.endMillis = adjustedEndDate.getTime();

    //this is computed by hand in order to optimize cell size
    var computedTableWidth = (self.endMillis - self.startMillis) * zoomDrawer.computedScaleX;

    //set a minimal width
    computedTableWidth = Math.max(computedTableWidth, self.minGanttSize);

    var table = $("<table cellspacing=0 cellpadding=0>");

    //loop for header1
    var start = new Date(self.startMillis);
    var tr1 = $("<tr>").addClass("ganttHead1");
    while (start.getTime() <= self.endMillis) {
        zoomDrawer.row1(start, tr1);
    }

    //loop for header2  e tbody
    start = new Date(self.startMillis);
    var tr2 = $("<tr>").addClass("ganttHead2");
    var trBody = $("<tr>").addClass("ganttBody");
    while (start.getTime() <= self.endMillis) {
        zoomDrawer.row2(start, tr2, trBody);
    }

    table.append(tr1).append(tr2);   // removed as on FF there are rounding issues  //.css({width:computedTableWidth});

    var head = table.clone().addClass("ganttFixHead");

    table.append(trBody).addClass("ganttTable");


    var height = self.master.editor.element.height();
    table.height(height);

    var box = $("<div>");
    box.addClass("gantt unselectable").attr("unselectable", "true").css({
        position: "relative",
        width: computedTableWidth
    });
    box.append(table);
    box.append(head);

    //create the svg
    box.svg({
        settings: {class: "ganttSVGBox"},
        onLoad: function (svg) {
            //console.debug("svg loaded", svg);

            //creates gradient and definitions
            var defs = svg.defs('myDefs');

            //create backgound
            var extDep = svg.pattern(defs, "extDep", 0, 0, 10, 10, 0, 0, 10, 10, {patternUnits: 'userSpaceOnUse'});
            var img = svg.image(extDep, 0, 0, 10, 10, self.master.resourceUrl + "hasExternalDeps.png", {opacity: .3});

            self.svg = svg;
            $(svg).addClass("ganttSVGBox");

            //creates grid group
            var gridGroup = svg.group("gridGroup");

            //creates links group
            self.linksGroup = svg.group("linksGroup");

            //creates tasks group
            self.tasksGroup = svg.group("tasksGroup");

            //compute scalefactor fx
            //self.fx = computedTableWidth / (endPeriod - startPeriod);
            self.fx = zoomDrawer.computedScaleX;

        }
    });

    return box;
};


//<%-------------------------------------- GANT TASK GRAPHIC ELEMENT --------------------------------------%>
Ganttalendar.prototype.drawTask = function (task) {
    //console.debug("drawTask", task.name,this.master.showBaselines,this.taskHeight);
    var self = this;
    //var prof = new Profiler("ganttDrawTask");

    if (self.master.showBaselines) {
        var baseline = self.master.baselines[task.id];
        if (baseline) {
            //console.debug("baseLine",baseline)
            var baseTask = $(_createBaselineSVG(task, baseline));
            baseTask.css("opacity", .5);
            task.ganttBaselineElement = baseTask;
        }
    }

    let createTaskSVG = _createTaskSVG(task);
    var taskBox = $(createTaskSVG[0]);
    var taskBox2 = $(createTaskSVG[1]);
    task.ganttElement = taskBox;
    task.ganttElementPlan = taskBox2;


    if (self.showCriticalPath && task.isCritical)
        taskBox.addClass("critical");
    prepareTaskBox = (taskBox, isSecond) => {
        isSecond = isSecond || false
        taskBox
            .click(function (e) { // manages selection
                e.stopPropagation();// to avoid body remove focused
                self.element.find("[class*=focused]").removeClass("focused");
                $(".ganttSVGBox .focused").removeClass("focused");
                var el = $(this);
                if (!self.resDrop)
                    el.addClass("focused");
                self.resDrop = false; //hack to avoid select

                $("body").off("click.focused").one("click.focused", function () {
                    $(".ganttSVGBox .focused").removeClass("focused");
                })

            })
            // .dblclick(function () {
            // if (self.master.permissions.canSeePopEdit)
            //     self.master.editor.openFullEditor(task,false);
            // })
            .mouseenter(function () {
                //bring to top
                var el = $(this);
                if (!self.linkOnProgress) {
                    $("[class*=linkHandleSVG]").hide();
                    el.find("[class*=linkHandleSVG]").stopTime("hideLink").show();
                } else {
                    el.addClass("linkOver");
                }
            })
            .mouseleave(function () {
                var el = $(this);
                el.removeClass("linkOver").find("[class*=linkHandleSVG]").oneTime(500, "hideLink", function () {
                    $(this).hide()
                });

            })
            .mouseup(function (e) {
                $(":focus").blur(); // in order to save grid field when moving task
            })
            .mousedown(function () {
                var task = self.master.getTask($(this).attr("taskid"));
                task.rowElement.click();
            })
            .dragExtedSVG($(self.svg.root()), {
                canResize: this.master.permissions.canWrite || task.canWrite,
                canDrag: !task.depends && (this.master.permissions.canWrite || task.canWrite),
                resizeZoneWidth: self.resizeZoneWidth,
                startDrag: function (e) {
                    $(".ganttSVGBox .focused").removeClass("focused");
                },
                drag: function (e) {
                    $("[from=" + task.id + "],[to=" + task.id + "]").trigger("update");
                },
                drop: function (e) {
                    self.resDrop = true; //hack to avoid select
                    var taskbox = $(this);
                    var task = self.master.getTask(taskbox.attr("taskid"));
                    var s = Math.round((parseFloat(taskbox.attr("x")) / self.fx) + self.startMillis);
                    self.master.beginTransaction();
                    self.master.moveTask(task, new Date(s), isSecond);
                    self.master.endTransaction();
                },
                startResize: function (e) {
                    $(".ganttSVGBox .focused").removeClass("focused");
                    var taskbox = $(this);
                    var text = $(self.svg.text(parseInt(taskbox.attr("x")) + parseInt(taskbox.attr("width") + 8), parseInt(taskbox.attr("y")), "", {
                        "font-size": "10px",
                        "fill": "red"
                    }));
                    taskBox.data("textDur", text);
                },
                resize: function (e) {
                    //find and update links from, to
                    var taskbox = $(this);
                    var st = Math.round((parseFloat(taskbox.attr("x")) / self.fx) + self.startMillis);
                    var en = Math.round(((parseFloat(taskbox.attr("x")) + parseFloat(taskbox.attr("width"))) / self.fx) + self.startMillis);
                    var d = getDurationInUnits(computeStartDate(st), computeEndDate(en));
                    var text = taskBox.data("textDur");
                    text.attr("x", parseInt(taskbox.attr("x")) + parseInt(taskbox.attr("width")) + 8).html(durationToString(d));

                    $("[from=" + task.id + "],[to=" + task.id + "]").trigger("update");
                },
                stopResize: function (e) {
                    // self.resDrop = true; //hack to avoid select
                    var textBox = taskBox.data("textDur");
                    if (textBox)
                        textBox.remove();
                    var taskbox = $(this);
                    var task = self.master.getTask(taskbox.attr("taskid"));
                    var st = Math.round((parseFloat(taskbox.attr("x")) / self.fx) + self.startMillis);
                    var en = Math.round(((parseFloat(taskbox.attr("x")) + parseFloat(taskbox.attr("width"))) / self.fx) + self.startMillis);
                    //in order to avoid rounding issue if the movement is less than 1px we keep the same start and end dates
                    if (isSecond) {
                        if (Math.abs(st - task.startPlan) < 1 / self.fx && isSecond) {
                            console.log('3');
                            st = task.startPlan;
                        }
                        if (Math.abs(en - task.endPlan) < 1 / self.fx && isSecond) {
                            console.log('4');
                            en = task.endPlan;
                        }
                    } else {
                        if (Math.abs(st - task.start) < 1 / self.fx) {
                            console.log('1');
                            st = task.start;
                        }
                        if (Math.abs(en - task.end) < 1 / self.fx) {
                            console.log('2');
                            en = task.end;
                        }
                    }



                    self.master.beginTransaction();
                    self.master.changeTaskDates(task, new Date(st), new Date(en), isSecond);
                    self.master.endTransaction();
                }
            })
            .find("[class*=linkHandleSVG]").mousedown(function (e) {
            e.preventDefault();
            e.stopPropagation();
            var taskBox = $(this).closest(".taskBoxSVG");
            var svg = $(self.svg.root());
            var offs = svg.offset();
            self.linkOnProgress = true;
            self.linkFromEnd = $(this).is(".taskLinkEndSVG");
            svg.addClass("linkOnProgress");

            // create the line
            var startX = parseFloat(taskBox.attr("x")) + (self.linkFromEnd ? parseFloat(taskBox.attr("width")) : 0);
            var startY = parseFloat(taskBox.attr("y")) + parseFloat(taskBox.attr("height")) / 2;
            var line = self.svg.line(startX, startY, e.pageX - offs.left - 5, e.pageY - offs.top - 5, {class: "linkLineSVG"});
            var circle = self.svg.circle(startX, startY, 5, {class: "linkLineSVG"});

            //bind mousemove to draw a line
            svg.bind("mousemove.linkSVG", function (e) {
                var offs = svg.offset();
                var nx = e.pageX - offs.left;
                var ny = e.pageY - offs.top;
                var c = Math.sqrt(Math.pow(nx - startX, 2) + Math.pow(ny - startY, 2));
                nx = nx - (nx - startX) * 10 / c;
                ny = ny - (ny - startY) * 10 / c;
                self.svg.change(line, {x2: nx, y2: ny});
                self.svg.change(circle, {cx: nx, cy: ny});
            });

            //bind mouseup un body to stop
            $("body").one("mouseup.linkSVG", function (e) {
                $(line).remove();
                $(circle).remove();
                self.linkOnProgress = false;
                svg.removeClass("linkOnProgress");

                $(self.svg.root()).unbind("mousemove.linkSVG");
                var targetBox = $(e.target).closest(".taskBoxSVG");
                //console.debug("create link from " + taskBox.attr("taskid") + " to " + targetBox.attr("taskid"));

                if (targetBox && targetBox.attr("taskid") != taskBox.attr("taskid")) {
                    var taskTo;
                    var taskFrom;
                    if (self.linkFromEnd) {
                        taskTo = self.master.getTask(targetBox.attr("taskid"));
                        taskFrom = self.master.getTask(taskBox.attr("taskid"));
                        if (taskFrom.id && taskTo) {
                            taskTo.depends = String(Math.abs(taskFrom.id))
                            self.drawLink(taskFrom, taskTo);
                        }
                    } else {
                        taskFrom = self.master.getTask(targetBox.attr("taskid"));
                        taskTo = self.master.getTask(taskBox.attr("taskid"));
                        if (taskFrom.id && taskTo) {
                            taskTo.depends = String(Math.abs(taskFrom.id))
                            self.drawLink(taskFrom, taskTo);
                        }
                    }

                    if (taskTo && taskFrom) {
                        var gap = 0;
                        var depInp = taskTo.rowElement.find("[name=depends]");
                        depInp.val(depInp.val() + ((depInp.val() + "").length > 0 ? "," : "") + (taskFrom.getRow() + 1) + (gap != 0 ? ":" + gap : ""));
                        depInp.blur();
                    }
                }
            })
        })
    }
    if (this.master.permissions.canWrite || task.canWrite) {

        //bind all events on taskBox
        // noinspection JSVoidFunctionReturnValueUsed
        prepareTaskBox(taskBox);
        prepareTaskBox(taskBox2, true);

        //binding for creating link

    }
    //ask for redraw link
    self.redrawLinks();

    //prof.stop();


    function _createTaskSVG(task) {
        var svg = self.svg;

        var dimensions = {
            x: Math.round((task.start - self.startMillis) * self.fx),
            y: task.rowElement.position().top + task.rowElement.offsetParent().scrollTop() + self.taskVertOffset,
            width: Math.max(Math.round((task.end - task.start) * self.fx), 1),
            height: (self.master.showBaselines ? self.taskHeight / 1.3 : self.taskHeight)
        };

        var taskSvg = svg.svg(
            self.tasksGroup,
            dimensions.x,
            dimensions.y + dimensions.height / 2,
            dimensions.width,
            dimensions.height,
            {class: "taskBox taskBoxSVG taskStatusSVG", status: task.status, taskid: task.id, fill: "#6675e3"}
        );

        //svg.title(taskSvg, task.name);
        //external box

        var layout = svg.rect(taskSvg, 0, 0, "100%", "100%", {class: "taskLayout", rx: "2", ry: "2"});
        if (task.end === task.start) {
            taskSvg.classList.add('superCollapse')
        } else {
            taskSvg.classList.remove('superCollapse')
        }
        if (task.startPlan && task.durationPlan) {
            var dimensions2 = {
                x: Math.round((task.startPlan - self.startMillis) * self.fx),
                y: task.rowElement.position().top + task.rowElement.offsetParent().scrollTop() + self.taskVertOffset,
                width: Math.max(Math.round((task.endPlan - task.startPlan) * self.fx), 1),
                height: (self.master.showBaselines ? self.taskHeight / 1.3 : self.taskHeight)
            };

            var taskSvg2 = svg.svg(
                self.tasksGroup,
                dimensions2.x,
                dimensions2.y - dimensions2.height / 2,
                dimensions2.width,
                dimensions2.height,
                {class: "taskBox taskBoxSVG taskStatusSVG", status: task.status, taskid: task.id, fill: "#20309c"}
            );

            var layout2 = svg.rect(taskSvg2, 0, 0, "100%", "100%", {class: "taskLayout", rx: "2", ry: "2"});
        }
        //external dep
        // if (task.hasExternalDep)
        //   svg.rect(taskSvg, 0, 0, "100%", "100%", {fill:"url(#extDep)"});

        //progress
        // if (task.progress > 0) {
        //   var progress = svg.rect(taskSvg, 0, "20%", (task.progress > 100 ? 100 : task.progress) + "%", "60%", {rx:"2", ry:"2",fill:"rgba(0,0,0,.4)"});
        //   if (dimensions.width > 50) {
        //     var textStyle = {fill:"#888", "font-size":"10px",class:"textPerc teamworkIcons",transform:"translate(5)"};
        //     if (task.progress > 100)
        //       textStyle["font-weight"]="bold";
        //     if (task.progress > 90)
        //       textStyle.transform = "translate(-40)";
        //     svg.text(taskSvg, (task.progress > 90 ? 100 : task.progress) + "%", (self.master.rowHeight - 5) / 2, (task.progress > 100 ? "!!! " : "") + task.progress + "%", textStyle);
        //   }
        // }

        // if (task.isParent())
        // svg.rect(taskSvg, 0, 0, "100%", 3, {fill:"#000"});

        // if (task.startIsMilestone) {
        //   svg.image(taskSvg, -9, dimensions.height/2-9, 18, 18, self.master.resourceUrl +"milestone.png")
        // }
        //
        // if (task.endIsMilestone) {
        //   svg.image(taskSvg, "100%",dimensions.height/2-9, 18, 18, self.master.resourceUrl +"milestone.png", {transform:"translate(-9)"})
        // }

        //task label
        // svg.text(taskSvg, "100%", 18, task.name, {class:"taskLabelSVG", transform:"translate(20,-5)"});

        //link tool
        if (task.level > 0) {
            svg.circle(taskSvg, -self.resizeZoneWidth, dimensions.height / 2, dimensions.height / 3, {
                class: "taskLinkStartSVG linkHandleSVG",
                transform: "translate(" + (-dimensions.height / 3 + 1) + ")"
            });
            svg.circle(taskSvg, dimensions.width + self.resizeZoneWidth, dimensions.height / 2, dimensions.height / 3, {
                class: "taskLinkEndSVG linkHandleSVG",
                transform: "translate(" + (dimensions.height / 3 - 1) + ")"
            });
        }
        svg.text(taskSvg, "50%", 18, task.progress ? task.progress : '', {
            class: "taskLabelSVG",
            transform: "translate(0,-8)"
        });
        return [taskSvg, taskSvg2]
    }

    function _createBaselineSVG(task, baseline) {
        var svg = self.svg;

        var dimensions = {
            x: Math.round((baseline.startDate - self.startMillis) * self.fx),
            y: task.rowElement.position().top + task.rowElement.offsetParent().scrollTop() + self.taskVertOffset + self.taskHeight / 2,
            width: Math.max(Math.round((baseline.endDate - baseline.startDate) * self.fx), 1),
            height: (self.master.showBaselines ? self.taskHeight / 1.5 : self.taskHeight)
        };
        var taskSvg = svg.svg(self.tasksGroup, dimensions.x, dimensions.y, dimensions.width, dimensions.height, {
            class: "taskBox taskBoxSVG taskStatusSVG baseline",
            status: baseline.status,
            taskid: task.id,
            fill: task.color || "#eee"
        });

        //tooltip
        var label = "<b>" + task.name + "</b>";
        label += "<br>";
        label += "@" + new Date(self.master.baselineMillis).format();
        label += "<br><br>";
        label += "<b>Status:</b> " + baseline.status;
        label += "<br><br>";
        label += "<b>Start:</b> " + new Date(baseline.startDate).format();
        label += "<br>";
        label += "<b>End:</b> " + new Date(baseline.endDate).format();
        label += "<br>";
        label += "<b>Duration:</b> " + baseline.duration;
        label += "<br>";
        label += "<b>Progress:</b> " + baseline.progress + "%";

        $(taskSvg).attr("data-label", label).on("click", function (event) {
            showBaselineInfo(event, this);
            //bind hide
        });

        //external box
        var layout = svg.rect(taskSvg, 0, 0, "100%", "100%", {class: "taskLayout", rx: "2", ry: "2"});
        // var layout2 = svg.rect(taskSvg, 0, 0, "100%", "100%", {class: "taskLayout", rx: "2", ry: "2"});

        //progress

        if (baseline.progress > 0) {
            var progress = svg.rect(taskSvg, 0, "20%", (baseline.progress > 100 ? 100 : baseline.progress) + "%", "60%", {
                rx: "2",
                ry: "2",
                fill: "rgba(0,0,0,.4)"
            });
            /*if (dimensions.width > 50) {
             var textStyle = {fill:"#888", "font-size":"10px",class:"textPerc teamworkIcons",transform:"translate(5)"};
             if (baseline.progress > 100)
             textStyle["font-weight"]="bold";
             if (baseline.progress > 90)
             textStyle.transform = "translate(-40)";
             svg.text(taskSvg, (baseline.progress > 90 ? 100 : baseline.progress) + "%", (self.master.rowHeight - 5) / 2, (baseline.progress > 100 ? "!!! " : "") + baseline.progress + "%", textStyle);
             }*/
        }

        //if (task.isParent())
        //  svg.rect(taskSvg, 0, 0, "100%", 3, {fill:"#000"});


        //task label
        //svg.text(taskSvg, "100%", 18, task.name, {class:"taskLabelSVG", transform:"translate(20,-5)"});

        return taskSvg
    }

};


Ganttalendar.prototype.addTask = function (task) {
    //currently do nothing
};


//<%-------------------------------------- GANT DRAW LINK SVG ELEMENT --------------------------------------%>
//'from' and 'to' are tasks already drawn
Ganttalendar.prototype.drawLink = function (from, to, type) {
    //console.debug("drawLink")
    var self = this;
    var peduncolusSize = 10;

    /**
     * Given an item, extract its rendered position
     * width and height into a structure.
     */
    function buildRectFromTask(task) {
        var self = task.master.gantt;
        var editorRow = task.rowElement;
        var top = editorRow.position().top + editorRow.offsetParent().scrollTop();
        var x = Math.round((task.start - self.startMillis) * self.fx);
        var rect = {
            left: x,
            top: top + self.taskVertOffset,
            width: Math.max(Math.round((task.end - task.start) * self.fx), 1),
            height: self.taskHeight
        };
        return rect;
    }

    /**
     * The default rendering method, which paints a start to end dependency.
     */
    function drawStartToEnd(from, to, ps) {
        var svg = self.svg;

        //this function update an existing link
        function update() {
            var group = $(this);
            var from = group.data("from");
            var to = group.data("to");
            var rectFrom = buildRectFromTask(from);
            var rectTo = buildRectFromTask(to);

            var fx1 = rectFrom.left;
            var fx2 = rectFrom.left + rectFrom.width;
            var fy = rectFrom.height / 2 + rectFrom.top;

            var tx1 = rectTo.left;
            var tx2 = rectTo.left + rectTo.width;
            var ty = rectTo.height / 2 + rectTo.top;

            var tooClose = tx1 < fx2 + 2 * ps;
            var r = 5; //radius
            var arrowOffset = 5;
            var up = fy > ty;
            var fup = up ? -1 : 1;

            var prev = fx2 + 2 * ps > tx1;
            var fprev = prev ? -1 : 1;

            var image = group.find("image");
            var p = svg.createPath();

            if (tooClose) {
                var firstLine = fup * (rectFrom.height / 2 - 2 * r + 2);
                p.move(fx2, fy + self.taskHeight / 2)
                    .line(ps, 0, true)
                    .arc(r, r, 90, false, !up, r, fup * r, true)
                    .line(0, firstLine, true)
                    .arc(r, r, 90, false, !up, -r, fup * r, true)
                    .line(fprev * 2 * ps + (tx1 - fx2), 0, true)
                    .arc(r, r, 90, false, up, -r, fup * r, true)
                    .line(0, (Math.abs(ty - fy + self.taskHeight / 2) - 4 * r - Math.abs(firstLine)) * fup - arrowOffset, true)
                    .arc(r, r, 90, false, up, r, fup * r, true)
                    .line(ps, 0, true);

                image.attr({x: tx1 - 5, y: ty - 5 - arrowOffset + self.taskHeight});

            } else {
                p.move(fx2, fy + self.taskHeight / 2)
                    .line((tx1 - fx2) / 2 - r, 0, true)
                    .arc(r, r, 90, false, !up, r, fup * r, true)
                    .line(0, ty - fy + self.taskHeight / 2 - fup * 4 * r + arrowOffset, true)
                    .arc(r, r, 90, false, up, r, fup * r, true)
                    .line((tx1 - fx2) / 2 - r, 0, true);
                image.attr({x: tx1 - 5, y: ty - 5 - arrowOffset + self.taskHeight});
            }

            group.find("path").attr({d: p.path()});
        }


        // create the group
        var group = svg.group(self.linksGroup, "" + from.id + "-" + to.id);
        svg.title(group, from.name + " -> " + to.name);

        var p = svg.createPath();

        //add the arrow
        svg.image(group, 0, 0, 5, 10, self.master.resourceUrl + "linkArrow.png");
        //create empty path
        svg.path(group, p, {class: "taskLinkPathSVG"});

        //set "from" and "to" to the group, bind "update" and trigger it
        var jqGroup = $(group).data({from: from, to: to}).attr({
            from: from.id,
            to: to.id
        }).on("update", update).trigger("update");
        if (self.showCriticalPath && from.isCritical && to.isCritical) {
            jqGroup.addClass("critical");
        }

        jqGroup.addClass("linkGroup");
        return jqGroup;
    }


    /**
     * A rendering method which paints a start to start dependency.
     */
    function drawStartToStart(from, to) {
        console.error("StartToStart not supported on SVG");
        var rectFrom = buildRectFromTask(from);
        var rectTo = buildRectFromTask(to);
    }

    var link;
    // Dispatch to the correct renderer
    if (type == 'start-to-start') {
        link = drawStartToStart(from, to, peduncolusSize);
    } else {
        link = drawStartToEnd(from, to, peduncolusSize);
    }

    // in order to create a dependency you will need permissions on both tasks
    if (this.master.permissions.canWrite || (from.canWrite && to.canWrite)) {
        link.click(function (e) {
            var el = $(this);
            e.stopPropagation();// to avoid body remove focused
            self.element.find("[class*=focused]").removeClass("focused");
            $(".ganttSVGBox .focused").removeClass("focused");
            var el = $(this);
            if (!self.resDrop)
                el.addClass("focused");
            self.resDrop = false; //hack to avoid select

            $("body").off("click.focused").one("click.focused", function () {
                $(".ganttSVGBox .focused").removeClass("focused");
            })

        });
    }


};

Ganttalendar.prototype.redrawLinks = function () {
    //console.debug("redrawLinks ");
    var self = this;
    this.element.stopTime("ganttlnksredr");
    this.element.oneTime(10, "ganttlnksredr", function () {

        //var prof=new Profiler("gd_drawLink_real");

        //remove all links
        $("#linksGroup").empty();

        var collapsedDescendant = [];

        //[expand]
        var collapsedDescendant = self.master.getCollapsedDescendant();
        for (var i = 0; i < self.master.links.length; i++) {
            var link = self.master.links[i];

            if (collapsedDescendant.indexOf(link.from) >= 0 || collapsedDescendant.indexOf(link.to) >= 0) continue;

            var rowA = link.from.getRow();
            var rowB = link.to.getRow();

            //if link is out of visible screen continue
            if (Math.max(rowA, rowB) < self.master.firstVisibleTaskIndex || Math.min(rowA, rowB) > self.master.lastVisibleTaskIndex) continue;

            self.drawLink(link.from, link.to);
        }
        //prof.stop();
    });
};


Ganttalendar.prototype.reset = function () {
    //var prof= new Profiler("ganttDrawerSVG.reset");
    this.element.find("[class*=linkGroup]").remove();
    this.element.find("[taskid]").remove();
    //prof.stop()
};


Ganttalendar.prototype.redrawTasks = function (drawAll) {
    //console.debug("redrawTasks ");
    var self = this;
    //var prof = new Profiler("ganttRedrawTasks");

    self.element.find("table.ganttTable").height(self.master.editor.element.height());

    var collapsedDescendant = this.master.getCollapsedDescendant();

    var startRowAdd = self.master.firstScreenLine - self.master.rowBufferSize;
    var endRowAdd = self.master.firstScreenLine + self.master.numOfVisibleRows + self.master.rowBufferSize;

    $("#linksGroup,#tasksGroup").empty();
    var gridGroup = $("#gridGroup").empty().get(0);

    //add missing ones
    var row = 0;
    self.master.firstVisibleTaskIndex = -1;
    for (var i = 0; i < self.master.tasks.length; i++) {

        var task = self.master.tasks[i];

        if (collapsedDescendant.indexOf(task) >= 0) {
            continue;
        }
        if (drawAll || (row >= startRowAdd && row < endRowAdd)) {
            this.drawTask(task);
            self.master.firstVisibleTaskIndex = self.master.firstVisibleTaskIndex == -1 ? i : self.master.firstVisibleTaskIndex;
            self.master.lastVisibleTaskIndex = i;
        }
        row++
    }

    //creates rows grid
    for (var i = 45.2; i <= self.master.editor.element.height(); i += self.master.rowHeight)
        self.svg.rect(gridGroup, 0, i, "100%", self.master.rowHeight, {class: "ganttLinesSVG"});

    // drawTodayLine
    if (new Date().getTime() > self.startMillis && new Date().getTime() < self.endMillis) {
        var x = Math.round(((new Date().getTime()) - self.startMillis) * self.fx);
        self.svg.line(gridGroup, x, 0, x, "100%", {class: "ganttTodaySVG"});
    }


    //prof.stop();
};


Ganttalendar.prototype.shrinkBoundaries = function () {
    //console.debug("shrinkBoundaries")
    var start = Infinity;
    var end = -Infinity;
    for (var i = 0; i < this.master.tasks.length; i++) {
        var task = this.master.tasks[i];
        if (start > task.start)
            start = task.start;
        if (end < task.end)
            end = task.end;
    }

    //if include today synch extremes
    if (this.includeToday) {
        var today = new Date().getTime();
        start = start > today ? today : start;
        end = end < today ? today : end;
    }

    //mark boundaries as changed
    this.gridChanged = this.gridChanged || this.originalStartMillis != start || this.originalEndMillis != end;

    this.originalStartMillis = start;
    this.originalEndMillis = end;
};

Ganttalendar.prototype.setBestFittingZoom = function () {
    //console.debug("setBestFittingZoom");

    if (this.getStoredZoomLevel()) {
        this.zoom = this.getStoredZoomLevel();
        return;
    }


    //if zoom is not defined get the best fitting one
    var dur = this.originalEndMillis - this.originalStartMillis;
    var minDist = Number.MAX_VALUE;
    var i = 0;
    for (; i < this.zoomLevels.length; i++) {
        var dist = Math.abs(dur - millisFromString(this.zoomLevels[i]));
        if (dist <= minDist) {
            minDist = dist;
        } else {
            break;
        }
        this.zoom = this.zoomLevels[i];
    }

    this.zoom = this.zoom || this.zoomLevels[this.zoomLevels.length - 1];

};

Ganttalendar.prototype.redraw = function () {
    //console.debug("redraw",this.zoom, this.originalStartMillis, this.originalEndMillis);
    //var prof= new Profiler("Ganttalendar.redraw");

    if (this.showCriticalPath) {
        this.master.computeCriticalPath();
    }

    if (this.gridChanged) {
        this.gridChanged = false;
        var par = this.element.parent();

        //try to maintain last scroll
        var scrollY = par.scrollTop();
        var scrollX = par.scrollLeft();

        this.element.remove();

        var domEl = this.createGanttGrid();
        this.element = domEl;
        par.append(domEl);
        this.redrawTasks();

        //set old scroll
        par.scrollTop(scrollY);
        par.scrollLeft(scrollX);

    } else {
        this.redrawTasks();
    }


    //set current task
    this.synchHighlight();

    //prof.stop();
    //Profiler.displayAll();
    //Profiler.reset()

};


Ganttalendar.prototype.fitGantt = function () {
    delete this.zoom;
    this.redraw();
};

Ganttalendar.prototype.synchHighlight = function () {
    //console.debug("synchHighlight",this.master.currentTask);
    if (this.master.currentTask) {
        // take care of collapsed rows
        var ganttHighLighterPosition = this.master.editor.element.find(".taskEditRow:visible").index(this.master.currentTask.rowElement);
        this.master.gantt.element.find(".ganttLinesSVG").removeClass("rowSelected").eq(ganttHighLighterPosition).addClass("rowSelected");
    } else {
        $(".rowSelected").removeClass("rowSelected"); // todo non c'era
    }
};


Ganttalendar.prototype.getCenterMillis = function () {
    return parseInt((this.element.parent().scrollLeft() + this.element.parent().width() / 2) / this.fx + this.startMillis);
};

Ganttalendar.prototype.goToMillis = function (millis) {
    var x = Math.round(((millis) - this.startMillis) * this.fx) - this.element.parent().width() / 2;
    this.element.parent().scrollLeft(x);
};

Ganttalendar.prototype.centerOnToday = function () {
    this.goToMillis(new Date().getTime());
};


/**
 * Allows drag and drop and extesion of task boxes. Only works on x axis
 * @param opt
 * @return {*}
 */
$.fn.dragExtedSVG = function (svg, opt) {

    //doing this can work with one svg at once only
    var target;
    var svgX;
    var offsetMouseRect;

    var options = {
        canDrag: true,
        canResize: true,
        resizeZoneWidth: 5,
        minSize: 10,
        startDrag: function (e) {
        },
        drag: function (e) {
        },
        drop: function (e) {
        },
        startResize: function (e) {
        },
        resize: function (e) {
        },
        stopResize: function (e) {
        }
    };

    $.extend(options, opt);

    this.each(function () {
        var el = $(this);
        svgX = svg.parent().offset().left; //parent is used instead of svg for a Firefox oddity
        if (options.canDrag)
            el.addClass("deSVGdrag");
        if (options.canResize || options.canDrag) {
            el.bind("mousedown.deSVG", function (e) {
                    //console.debug("mousedown.deSVG");
                    if ($(e.target).is("image")) {
                        e.preventDefault();
                    }

                    target = $(this);
                    var x1 = parseFloat(el.find("[class*=taskLayout]").offset().left);
                    var x2 = x1 + parseFloat(el.attr("width"));
                    var posx = e.pageX;

                    $("body").unselectable();

                    //start resize end
                    if (options.canResize && Math.abs(posx - x2) <= options.resizeZoneWidth) {
                        //store offset mouse x2
                        offsetMouseRect = x2 - e.pageX;
                        target.attr("oldw", target.attr("width"));
                        var one = true;

                        //bind event for start resizing
                        $(svg).bind("mousemove.deSVG", function (e) {
                            //hide link circle
                            $("[class*=linkHandleSVG]").hide();

                            if (one) {
                                //trigger startResize
                                options.startResize.call(target.get(0), e);
                                one = false;
                            }

                            //manage resizing
                            var nW = e.pageX - x1 + offsetMouseRect;

                            target.attr("width", nW < options.minSize ? options.minSize : nW);
                            //callback

                            options.resize.call(target.get(0), e);
                        });

                        //bind mouse up on body to stop resizing
                        $("body").one("mouseup.deSVG", stopResize);


                        //start resize start
                    } else if (options.canResize && Math.abs(posx - x1) <= options.resizeZoneWidth) {
                        //store offset mouse x1
                        offsetMouseRect = parseFloat(target.attr("x"));
                        target.attr("oldw", target.attr("width")); //todo controllare se è ancora usato oldw
                        var one = true;

                        //bind event for start resizing
                        $(svg).bind("mousemove.deSVG", function (e) {
                            //hide link circle
                            $("[class*=linkHandleSVG]").hide();

                            if (one) {
                                //trigger startResize
                                options.startResize.call(target.get(0), e);
                                one = false;
                            }

                            //manage resizing
                            var nx1 = offsetMouseRect - (posx - e.pageX);
                            var nW = (x2 - x1) + (posx - e.pageX);
                            nW = nW < options.minSize ? options.minSize : nW;
                            target.attr("x", nx1);
                            target.attr("width", nW);
                            //callback
                            options.resize.call(target.get(0), e);
                        });

                        //bind mouse up on body to stop resizing
                        $("body").one("mouseup.deSVG", stopResize);


                        // start drag
                    } else if (options.canDrag) {
                        //store offset mouse x1
                        offsetMouseRect = parseFloat(target.attr("x")) - e.pageX;
                        target.attr("oldx", target.attr("x"));

                        var one = true;
                        //bind event for start dragging
                        $(svg).bind("mousemove.deSVG", function (e) {
                            //hide link circle
                            $("[class*=linkHandleSVG]").hide();
                            if (one) {
                                //trigger startDrag
                                options.startDrag.call(target.get(0), e);
                                one = false;
                            }

                            //manage resizing
                            target.attr("x", offsetMouseRect + e.pageX);
                            //callback
                            options.drag.call(target.get(0), e);

                        }).bind("mouseleave.deSVG", drop);

                        //bind mouse up on body to stop resizing
                        $("body").one("mouseup.deSVG", drop);

                    }
                }
            ).bind("mousemove.deSVG",
                function (e) {
                    var el = $(this);
                    var x1 = el.find("[class*=taskLayout]").offset().left;
                    var x2 = x1 + parseFloat(el.attr("width"));
                    var posx = e.pageX;
                    //set cursor handle
                    //if (options.canResize && (x2-x1)>3*options.resizeZoneWidth &&((posx<=x2 &&  posx >= x2- options.resizeZoneWidth) || (posx>=x1 && posx<=x1+options.resizeZoneWidth))) {
                    if (options.canResize && (Math.abs(posx - x1) <= options.resizeZoneWidth || Math.abs(posx - x2) <= options.resizeZoneWidth)) {
                        el.addClass("deSVGhand");
                    } else {
                        el.removeClass("deSVGhand");
                    }
                }
            ).addClass("deSVG");
        }
    });
    return this;


    function stopResize(e) {
        $(svg).unbind("mousemove.deSVG").unbind("mouseup.deSVG").unbind("mouseleave.deSVG");
        if (target && target.attr("oldw") != target.attr("width"))
            options.stopResize.call(target.get(0), e); //callback
        target = undefined;
        $("body").clearUnselectable();
    }

    function drop(e) {
        $(svg).unbind("mousemove.deSVG").unbind("mouseup.deSVG").unbind("mouseleave.deSVG");
        if (target && target.attr("oldx") != target.attr("x"))
            console.log('hello world!')
            options.drop.call(target.get(0), e); //callback
        target = undefined;
        $("body").clearUnselectable();
    }

};