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/**

 * jqPlot

 * Pure JavaScript plotting plugin using jQuery

 *

 * Version: 1.0.8

 * Revision: 1250

 *

 * Copyright (c) 2009-2013 Chris Leonello

 * jqPlot is currently available for use in all personal or commercial projects

 * under both the MIT (http://www.opensource.org/licenses/mit-license.php) and GPL

 * version 2.0 (http://www.gnu.org/licenses/gpl-2.0.html) licenses. This means that you can

 * choose the license that best suits your project and use it accordingly.

 *

 * Although not required, the author would appreciate an email letting him

 * know of any substantial use of jqPlot.  You can reach the author at:

 * chris at jqplot dot com or see http://www.jqplot.com/info.php .

 *

 * If you are feeling kind and generous, consider supporting the project by

 * making a donation at: http://www.jqplot.com/donate.php .

 *

 * sprintf functions contained in jqplot.sprintf.js by Ash Searle:

 *

 *     version 2007.04.27

 *     author Ash Searle

 *     http://hexmen.com/blog/2007/03/printf-sprintf/

 *     http://hexmen.com/js/sprintf.js

 *     The author (Ash Searle) has placed this code in the public domain:

 *     "This code is unrestricted: you are free to use it however you like."

 *

 */

(function($) {

    /**

     * Class: $.jqplot.Dragable

     * Plugin to make plotted points dragable by the user.

     */

    $.jqplot.Dragable = function(options) {

        // Group: Properties

        this.markerRenderer = new $.jqplot.MarkerRenderer({shadow:false});

        this.shapeRenderer = new $.jqplot.ShapeRenderer();

        this.isDragging = false;

        this.isOver = false;

        this._ctx;

        this._elem;

        this._point;

        this._gridData;

        // prop: color

        // CSS color spec for the dragged point (and adjacent line segment or bar).

        this.color;

        // prop: constrainTo

        // Constrain dragging motion to an axis or to none.

        // Allowable values are 'none', 'x', 'y'

        this.constrainTo = 'none';  // 'x', 'y', or 'none';

        $.extend(true, this, options);

    };

    function DragCanvas() {

        $.jqplot.GenericCanvas.call(this);

        this.isDragging = false;

        this.isOver = false;

        this._neighbor;

        this._cursors = [];

    }

    DragCanvas.prototype = new $.jqplot.GenericCanvas();

    DragCanvas.prototype.constructor = DragCanvas;

    // called within scope of series

    $.jqplot.Dragable.parseOptions = function (defaults, opts) {

        var options = opts || {};

        this.plugins.dragable = new $.jqplot.Dragable(options.dragable);

        // since this function is called before series options are parsed,

        // we can set this here and it will be overridden if needed.

        this.isDragable = $.jqplot.config.enablePlugins;

    };

    // called within context of plot

    // create a canvas which we can draw on.

    // insert it before the eventCanvas, so eventCanvas will still capture events.

    // add a new DragCanvas object to the plot plugins to handle drawing on this new canvas.

    $.jqplot.Dragable.postPlotDraw = function() {

        // Memory Leaks patch

        if (this.plugins.dragable && this.plugins.dragable.highlightCanvas) {

            this.plugins.dragable.highlightCanvas.resetCanvas();

            this.plugins.dragable.highlightCanvas = null;

        }

        this.plugins.dragable = {previousCursor:'auto', isOver:false};

        this.plugins.dragable.dragCanvas = new DragCanvas();

        this.eventCanvas._elem.before(this.plugins.dragable.dragCanvas.createElement(this._gridPadding, 'jqplot-dragable-canvas', this._plotDimensions, this));

        var dctx = this.plugins.dragable.dragCanvas.setContext();

    };

    //$.jqplot.preInitHooks.push($.jqplot.Dragable.init);

    $.jqplot.preParseSeriesOptionsHooks.push($.jqplot.Dragable.parseOptions);

    $.jqplot.postDrawHooks.push($.jqplot.Dragable.postPlotDraw);

    $.jqplot.eventListenerHooks.push(['jqplotMouseMove', handleMove]);

    $.jqplot.eventListenerHooks.push(['jqplotMouseDown', handleDown]);

    $.jqplot.eventListenerHooks.push(['jqplotMouseUp', handleUp]);

    function initDragPoint(plot, neighbor) {

        var s = plot.series[neighbor.seriesIndex];

        var drag = s.plugins.dragable;

        // first, init the mark renderer for the dragged point

        var smr = s.markerRenderer;

        var mr = drag.markerRenderer;

        mr.style = smr.style;

        mr.lineWidth = smr.lineWidth + 2.5;

        mr.size = smr.size + 5;

        if (!drag.color) {

            var rgba = $.jqplot.getColorComponents(smr.color);

            var newrgb = [rgba[0], rgba[1], rgba[2]];

            var alpha = (rgba[3] >= 0.6) ? rgba[3]*0.6 : rgba[3]*(2-rgba[3]);

            drag.color = 'rgba('+newrgb[0]+','+newrgb[1]+','+newrgb[2]+','+alpha+')';

        }

        mr.color = drag.color;

        mr.init();

        var start = (neighbor.pointIndex > 0) ? neighbor.pointIndex - 1 : 0;

        var end = neighbor.pointIndex+2;

        drag._gridData = s.gridData.slice(start, end);

    }

    function handleMove(ev, gridpos, datapos, neighbor, plot) {

        if (plot.plugins.dragable.dragCanvas.isDragging) {

            var dc = plot.plugins.dragable.dragCanvas;

            var dp = dc._neighbor;

            var s = plot.series[dp.seriesIndex];

            var drag = s.plugins.dragable;

            var gd = s.gridData;

            // compute the new grid position with any constraints.

            var x = (drag.constrainTo == 'y') ? dp.gridData[0] : gridpos.x;

            var y = (drag.constrainTo == 'x') ? dp.gridData[1] : gridpos.y;

            // compute data values for any listeners.

            var xu = s._xaxis.series_p2u(x);

            var yu = s._yaxis.series_p2u(y);

            // clear the canvas then redraw effect at new position.

            var ctx = dc._ctx;

            ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);

            // adjust our gridData for the new mouse position

            if (dp.pointIndex > 0) {

                drag._gridData[1] = [x, y];

            }

            else {

                drag._gridData[0] = [x, y];

            }

            plot.series[dp.seriesIndex].draw(dc._ctx, {gridData:drag._gridData, shadow:false, preventJqPlotSeriesDrawTrigger:true, color:drag.color, markerOptions:{color:drag.color, shadow:false}, trendline:{show:false}});

            plot.target.trigger('jqplotSeriesPointChange', [dp.seriesIndex, dp.pointIndex, [xu,yu], [x,y]]);

        }

        else if (neighbor != null) {

            var series = plot.series[neighbor.seriesIndex];

            if (series.isDragable) {

                var dc = plot.plugins.dragable.dragCanvas;

                if (!dc.isOver) {

                    dc._cursors.push(ev.target.style.cursor);

                    ev.target.style.cursor = "pointer";

                }

                dc.isOver = true;

            }

        }

        else if (neighbor == null) {

            var dc = plot.plugins.dragable.dragCanvas;

            if (dc.isOver) {

                ev.target.style.cursor = dc._cursors.pop();

                dc.isOver = false;

            }

        }

    }

    function handleDown(ev, gridpos, datapos, neighbor, plot) {

        var dc = plot.plugins.dragable.dragCanvas;

        dc._cursors.push(ev.target.style.cursor);

        if (neighbor != null) {

            var s = plot.series[neighbor.seriesIndex];

            var drag = s.plugins.dragable;

            if (s.isDragable && !dc.isDragging) {

                dc._neighbor = neighbor;

                dc.isDragging = true;

                initDragPoint(plot, neighbor);

                drag.markerRenderer.draw(s.gridData[neighbor.pointIndex][0], s.gridData[neighbor.pointIndex][1], dc._ctx);

                ev.target.style.cursor = "move";

                plot.target.trigger('jqplotDragStart', [neighbor.seriesIndex, neighbor.pointIndex, gridpos, datapos]);

            }

        }

        // Just in case of a hickup, we'll clear the drag canvas and reset.

        else {

           var ctx = dc._ctx;

           ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);

           dc.isDragging = false;

        }

    }

    function handleUp(ev, gridpos, datapos, neighbor, plot) {

        if (plot.plugins.dragable.dragCanvas.isDragging) {

            var dc = plot.plugins.dragable.dragCanvas;

            // clear the canvas

            var ctx = dc._ctx;

            ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);

            dc.isDragging = false;

            // redraw the series canvas at the new point.

            var dp = dc._neighbor;

            var s = plot.series[dp.seriesIndex];

            var drag = s.plugins.dragable;

            // compute the new grid position with any constraints.

            var x = (drag.constrainTo == 'y') ? dp.data[0] : datapos[s.xaxis];

            var y = (drag.constrainTo == 'x') ? dp.data[1] : datapos[s.yaxis];

            // var x = datapos[s.xaxis];

            // var y = datapos[s.yaxis];

            s.data[dp.pointIndex][0] = x;

            s.data[dp.pointIndex][1] = y;

            plot.drawSeries({preventJqPlotSeriesDrawTrigger:true}, dp.seriesIndex);

            dc._neighbor = null;

            ev.target.style.cursor = dc._cursors.pop();

            plot.target.trigger('jqplotDragStop', [gridpos, datapos]);

        }

    }

})(jQuery);