/*

 * The MIT License



Copyright (c) 2010 by Juergen Marsch



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.

*/

/*

Flot plugin for gantt data sets



  series: {

    gantt: { active: false,

             show: false,

             barHeight: 2

    }

  }

data: [



  $.plot($("#placeholder"), [{ data: [ ... ], gantt:{show: true} }])



*/
var h1;
var  data = null, canvas = null, target = null, axes = null, now = null,now_shadow = null, offset = null, highlights = [];

(function ($) {

    var options = {

        series: {

                        gantt: {active: false

                                , show: false

								, connectSteps: { show: false, lineWidth:2, color:"rgb(0,0,0)" }

                                , barHeight: 1

								, highlight: { opacity: 0.5 }

								, drawstep: drawStepDefault
								
								, stepcolorfunc : selectStepColorFuncDefault
								

                        }

                }

    };

    /*var  data = null, canvas = null, target = null, axes = null, offset = null, highlights = [];*/

	/**
	* @author Jordi Castells
	*
	*
	* Given an Alert value return its corresponding color.
	* with the colors and thresholds attributes
	*
	* If there's an error (ex, no color or threshold defined) the returned color is "Chewing gum pink"
	*
	* @param <value>		A specific value
	* @param <colors>		The colors array
	* @param <thresholds>	The thresholds array
	*/
	function selectStepColorFuncDefault(value,colors,isHighlight)
	{
            /*if(typeof(colors)=='undefined' || colors == null ) return "rgb(255,20,147)";
            return colors[value];*/
            if(value == 'no_alert')
                return 'rgba(102,102,102,1)';
            else
                return value;
	}
	
	/**
	* Default function for drawing a step 
	*/
 	function drawStepDefault(ctx,series,data,x,y,x2,color, isHighlight)

	{	

        var height;


        if(isHighlight){

            //draws a rectangle arround the cell
            ctx.strokeStyle = "rgba(255,255,255,1)";
            height = series.gantt.barheight;
            ctx.beginPath();
            ctx.lineWidth = 1;


            ctx.moveTo(x,y-(height/2));
            ctx.lineTo(x,y+(height/2));
            ctx.lineTo(x2,y+(height/2));
            ctx.lineTo(x2,y-(height/2));
            ctx.closePath();
            ctx.stroke();
        }

        //past cell
        //console.log("serie: "+data[1]+";----now: "+now+";----data_finish: "+ data[2]);
        if(now_shadow && now > data[2])
            ctx.globalAlpha = 0.1;

        //cell without highlighting
        else if(!isHighlight)
            ctx.globalAlpha = 0.6;

        else
            ctx.globalAlpha = 1;

        ctx.beginPath();
		//Color Selection. @author Jordi Castells Sala (HYDS)
        ctx.strokeStyle = series.gantt.stepcolorfunc(data[5],series.colorarray,isHighlight); 

        ctx.lineWidth = series.gantt.barheight - 2;

        ctx.lineCap = "butt";

	ctx.moveTo(x + 1, y);

        ctx.lineTo(x2 - 1, y);

        ctx.stroke();

	}

    function init(plot) 

	{	plot.hooks.processOptions.push(processOptions);

        function processOptions(plot,options)

        {   if (options.series.gantt.active)

            {   plot.hooks.draw.push(draw);

                plot.hooks.bindEvents.push(bindEvents);

                plot.hooks.drawOverlay.push(drawOverlay);

            }

        }

       	function draw(plot, ctx)

        {   var series;
            canvas = plot.getCanvas();

            target = $(canvas).parent();

            axes = plot.getAxes();           

            offset = plot.getPlotOffset();   

            data = plot.getData();

            now = plot.getOptions().now;

            now_shadow = plot.getOptions().now_shadow;

            for (var i = 0; i < data.length; i++)

            {	series = data[i];

                            var f1 = axes.yaxis.p2c(1)
			    series.gantt.barheight = f1 / (axes.yaxis.max - axes.yaxis.min) * series.gantt.barHeight;

				if (series.gantt.show) 

				{	for (var j = 0; j < series.data.length; j++)

					{	drawData(ctx,series, series.data[j], series.color,false); }

					if(series.gantt.connectSteps.show)

					{	drawConnections(ctx,series); }

                }

            }

     	}

        function drawData(ctx,series,data,color,isHighlight)


        {	var x,y,x2;
			
            x = offset.left + axes.xaxis.p2c(data[0]);

            y = offset.top + axes.yaxis.p2c(data[1]);

            x2 = offset.left + axes.xaxis.p2c(data[2]);

 			if (data.length == 4) 

			{	drawStepDefault(ctx, series, data, x, y, x2, color, isHighlight);}

			else

			{	series.gantt.drawstep(ctx,series,data,x,y,x2,color,isHighlight);}

        }

		function drawConnections(ctx,series)

		{	for(var i = 0; i < series.data.length; i++)

			{	for(var j = 0; j < series.data.length; j++)

				{	if(series.data[i][2] == series.data[j][0])

					{	var x = offset.left + axes.xaxis.p2c(series.data[i][2])

					       ,y = offset.top + axes.yaxis.p2c(series.data[i][1])

						   ,y2 = offset.top + axes.yaxis.p2c(series.data[j][1]);

						   drawConnection(ctx,x,y,y2,series.gantt.connectSteps.lineWidth,series.gantt.connectSteps.color);		   

					}

				}

			}

		}

		function drawConnection(ctx,x,y,y2,lineWidth,color)

		{	ctx.beginPath();

			ctx.lineWidth = lineWidth;

			ctx.strokeStyle = color;

			ctx.moveTo(x, y);

			ctx.lineTo(x, y2);

			ctx.stroke();

		}

        function bindEvents(plot, eventHolder)

        {   var r = null;

            var options = plot.getOptions();

            h1 = new HighLighting(plot, eventHolder, findNearby, options.series.gantt.active,highlights)

        }

        function findNearby(plot,mousex, mousey)

		{	var series, r;

            axes = plot.getAxes();

            for (var i = 0; i < data.length; i++) 

			{	series = data[i];

                if (series.gantt.show)

				{	for (var j = 0; j < series.data.length; j++) 

					{	var dataitem = series.data[j];

                        var dx = axes.xaxis.p2c(dataitem[0])

						  , dx2 = axes.xaxis.p2c(dataitem[2])

                          , dy = Math.abs(axes.yaxis.p2c(dataitem[1]) - mousey);

                        if (dy <= series.gantt.barheight / 2) 

						{	if (mousex >= dx && mousex <= dx2)

							{	r = { i: i, j: j }; }

						}

					}

            	}

        	}

         	return r;

    	}

        function drawOverlay(plot, octx)

        { 	
		
			octx.save();
            octx.clearRect(0, 0, target.width(), target.height());
			
            for (i = 0; i < highlights.length; ++i) {	
			
			drawHighlight(highlights[i]);
			
			}

            octx.restore();

            function drawHighlight(s)
			{	
				var c = "rgba(255, 255, 255, " + s.series.gantt.highlight.opacity + ")";

               	drawData(octx, s.series, s.point, c,true);

         	}

      	}

    }

    $.plot.plugins.push({

        init: init,

        options: options,

        name: 'gantt',

        version: '0.1'

    });

})(jQuery);