/**
 * Copyright (c) 2009 Chris Leonello
 * jqPlot is currently available for use in all personal or commercial projects 
 * under both the MIT and GPL version 2.0 licenses. This means that you can 
 * choose the license that best suits your project and use it accordingly. 
 *
 * The author would appreciate an email letting him know of any substantial
 * use of jqPlot.  You can reach the author at: chris dot leonello at gmail 
 * dot com or see http://www.jqplot.com/info.php .  This is, of course, 
 * not required.
 *
 * If you are feeling kind and generous, consider supporting the project by
 * making a donation at: http://www.jqplot.com/donate.php .
 *
 * Thanks for using jqPlot!
 * 
 */
(function($) {
    
    // Class: $.jqplot.BarRenderer
    // A plugin renderer for jqPlot to draw a bar plot.
    // Draws series as a line.
    
    $.jqplot.BarRenderer = function(){
        $.jqplot.LineRenderer.call(this);
    };
    
    $.jqplot.BarRenderer.prototype = new $.jqplot.LineRenderer();
    $.jqplot.BarRenderer.prototype.constructor = $.jqplot.BarRenderer;
    
    // called with scope of series.
    $.jqplot.BarRenderer.prototype.init = function(options) {
        // Group: Properties
        //
        // prop: barPadding
        // Number of pixels between adjacent bars at the same axis value.
        this.barPadding = 8;
        // prop: barMargin
        // Number of pixels between groups of bars at adjacent axis values.
        this.barMargin = 10;
        // prop: barDirection
        // 'vertical' = up and down bars, 'horizontal' = side to side bars
        this.barDirection = 'vertical';
        // prop: barWidth
        // Width of the bar in pixels (auto by devaul).  null = calculated automatically.
        this.barWidth = null;
        // prop: shadowOffset
        // offset of the shadow from the slice and offset of 
        // each succesive stroke of the shadow from the last.
        this.shadowOffset = 2;
        // prop: shadowDepth
        // number of strokes to apply to the shadow, 
        // each stroke offset shadowOffset from the last.
        this.shadowDepth = 5;
        // prop: shadowAlpha
        // transparency of the shadow (0 = transparent, 1 = opaque)
        this.shadowAlpha = 0.08;
        // prop: waterfall
        // true to enable waterfall plot.
        this.waterfall = false;
        // prop: varyBarColor
        // true to color each bar separately.
        this.varyBarColor = false;
        $.extend(true, this, options);
        // fill is still needed to properly draw the legend.
        // bars have to be filled.
        this.fill = true;
        
        if (this.waterfall) {
            this.fillToZero = false;
            this.disableStack = true;
        }
        
        if (this.barDirection == 'vertical' ) {
            this._primaryAxis = '_xaxis';
            this._stackAxis = 'y';
            this.fillAxis = 'y';
        }
        else {
            this._primaryAxis = '_yaxis';
            this._stackAxis = 'x';
            this.fillAxis = 'x';
        }
        // set the shape renderer options
        var opts = {lineJoin:'miter', lineCap:'round', fill:true, isarc:false, strokeStyle:this.color, fillStyle:this.color, closePath:this.fill};
        this.renderer.shapeRenderer.init(opts);
        // set the shadow renderer options
        var sopts = {lineJoin:'miter', lineCap:'round', fill:true, isarc:false, angle:this.shadowAngle, offset:this.shadowOffset, alpha:this.shadowAlpha, depth:this.shadowDepth, closePath:this.fill};
        this.renderer.shadowRenderer.init(sopts);
    };
    
    // called with scope of series
    function barPreInit(target, data, seriesDefaults, options) {
        if (this.rendererOptions.barDirection == 'horizontal') {
            this._stackAxis = 'x';
            this._primaryAxis = '_yaxis';
        }
        if (this.rendererOptions.waterfall == true) {
            this._data = $.extend(true, [], this.data);
            var sum = 0;
            var pos = (!this.rendererOptions.barDirection || this.rendererOptions.barDirection == 'vertical') ? 1 : 0;
            for(var i=0; i<this.data.length; i++) {
                sum += this.data[i][pos];
                if (i>0) {
                    this.data[i][pos] += this.data[i-1][pos];
                }
            }
            this.data[this.data.length] = (pos == 1) ? [this.data.length+1, sum] : [sum, this.data.length+1];
            this._data[this._data.length] = (pos == 1) ? [this._data.length+1, sum] : [sum, this._data.length+1];
        }
    }
    
    $.jqplot.preSeriesInitHooks.push(barPreInit);
    
    // needs to be called with scope of series, not renderer.
    $.jqplot.BarRenderer.prototype.calcSeriesNumbers = function() {
        var nvals = 0;
        var nseries = 0;
        var paxis = this[this._primaryAxis];
        var s, series, pos;
        // loop through all series on this axis
        for (var i=0; i < paxis._series.length; i++) {
            series = paxis._series[i];
            if (series === this) {
                pos = i;
            }
            // is the series rendered as a bar?
            if (series.renderer.constructor == $.jqplot.BarRenderer) {
                // gridData may not be computed yet, use data length insted
                nvals += series.data.length;
                nseries += 1;
            }
        }
        return [nvals, nseries, pos];
    };

    $.jqplot.BarRenderer.prototype.setBarWidth = function() {
        // need to know how many data values we have on the approprate axis and figure it out.
        var i;
        var nvals = 0;
        var nseries = 0;
        var paxis = this[this._primaryAxis];
        var s, series, pos;
        var temp = this.renderer.calcSeriesNumbers.call(this);
        nvals = temp[0];
        nseries = temp[1];
        var nticks = paxis.numberTicks;
        var nbins = (nticks-1)/2;
        // so, now we have total number of axis values.
        if (paxis.name == 'xaxis' || paxis.name == 'x2axis') {
            if (this._stack) {
                this.barWidth = (paxis._offsets.max - paxis._offsets.min) / nvals * nseries - this.barMargin;
            }
            else {
                this.barWidth = ((paxis._offsets.max - paxis._offsets.min)/nbins  - this.barPadding * (nseries-1) - this.barMargin*2)/nseries;
                // this.barWidth = (paxis._offsets.max - paxis._offsets.min) / nvals - this.barPadding - this.barMargin/nseries;
            }
        }
        else {
            if (this._stack) {
                this.barWidth = (paxis._offsets.min - paxis._offsets.max) / nvals * nseries - this.barMargin;
            }
            else {
                this.barWidth = ((paxis._offsets.min - paxis._offsets.max)/nbins  - this.barPadding * (nseries-1) - this.barMargin*2)/nseries;
                // this.barWidth = (paxis._offsets.min - paxis._offsets.max) / nvals - this.barPadding - this.barMargin/nseries;
            }
        }
        return [nvals, nseries];
    };
    
    $.jqplot.BarRenderer.prototype.draw = function(ctx, gridData, options) {
        var i;
        var opts = (options != undefined) ? options : {};
        var shadow = (opts.shadow != undefined) ? opts.shadow : this.shadow;
        var showLine = (opts.showLine != undefined) ? opts.showLine : this.showLine;
        var fill = (opts.fill != undefined) ? opts.fill : this.fill;
        var xaxis = this.xaxis;
        var yaxis = this.yaxis;
        var xp = this._xaxis.series_u2p;
        var yp = this._yaxis.series_u2p;
        var pointx, pointy, nvals, nseries, pos;
        
        if (this.barWidth == null) {
            this.renderer.setBarWidth.call(this);
        }
        
        var temp = this.renderer.calcSeriesNumbers.call(this);
        nvals = temp[0];
        nseries = temp[1];
        pos = temp[2];
        
        if (this._stack) {
            this._barNudge = 0;
        }
        else {
            this._barNudge = (-Math.abs(nseries/2 - 0.5) + pos) * (this.barWidth + this.barPadding);
        }
        if (showLine) {
            var negativeColors = new $.jqplot.ColorGenerator(this.negativeSeriesColors);
            var positiveColors = new $.jqplot.ColorGenerator(this.seriesColors);
            var negativeColor = negativeColors.get(this.index);
            if (! this.useNegativeColors) {
                negativeColor = opts.fillStyle;
            }
            var positiveColor = opts.fillStyle;
            
            if (this.barDirection == 'vertical') {
                for (var i=0; i<gridData.length; i++) {
                    points = [];
                    var base = gridData[i][0] + this._barNudge;
                    var ystart;
                    
                    // stacked
                    if (this._stack && this._prevGridData.length) {
                        ystart = this._prevGridData[i][1];
                    }
                    // not stacked and first series in stack
                    else {
                        if (this.fillToZero) {
                            ystart = this._yaxis.series_u2p(0);
                        }
                        else if (this.waterfall && i > 0 && i < this.gridData.length-1) {
                            ystart = this.gridData[i-1][1];
                        }
                        else {
                            ystart = ctx.canvas.height;
                        }
                    }
                    if ((this.fillToZero && this._plotData[i][1] < 0) || (this.waterfall && this._data[i][1] < 0)) {
                        if (this.varyBarColor) {
                            if (this.useNegativeColors) {
                                opts.fillStyle = negativeColors.next();
                            }
                            else {
                                opts.fillStyle = positiveColors.next();
                            }
                        }
                        else {
                            opts.fillStyle = negativeColor;
                        }
                    }
                    else {
                        if (this.varyBarColor) {
                            opts.fillStyle = positiveColors.next();
                        }
                        else {
                            opts.fillStyle = positiveColor;
                        }
                    }
                    
                    points.push([base-this.barWidth/2, ystart]);
                    points.push([base-this.barWidth/2, gridData[i][1]]);
                    points.push([base+this.barWidth/2, gridData[i][1]]);
                    points.push([base+this.barWidth/2, ystart]);
                    // now draw the shadows if not stacked.
                    // for stacked plots, they are predrawn by drawShadow
                    if (shadow && !this._stack) {
                        this.renderer.shadowRenderer.draw(ctx, points, opts);
                    }
                    this.renderer.shapeRenderer.draw(ctx, points, opts); 
                }
            }
            
            else if (this.barDirection == 'horizontal'){
                for (var i=0; i<gridData.length; i++) {
                    points = [];
                    var base = gridData[i][1] - this._barNudge;
                    var xstart;
                    
                    if (this._stack && this._prevGridData.length) {
                        xstart = this._prevGridData[i][0];
                    }
                    // not stacked and first series in stack
                    else {
                        if (this.fillToZero) {
                            xstart = this._xaxis.series_u2p(0);
                        }
                        else if (this.waterfall && i > 0 && i < this.gridData.length-1) {
                            xstart = this.gridData[i-1][1];
                        }
                        else {
                            xstart = 0;
                        }
                    }
                    if ((this.fillToZero && this._plotData[i][1] < 0) || (this.waterfall && this._data[i][1] < 0)) {
                        if (this.varyBarColor) {
                            if (this.useNegativeColors) {
                                opts.fillStyle = negativeColors.next();
                            }
                            else {
                                opts.fillStyle = positiveColors.next();
                            }
                        }
                    }
                    else {
                        if (this.varyBarColor) {
                            opts.fillStyle = positiveColors.next();
                        }
                        else {
                            opts.fillStyle = positiveColor;
                        }                    
                    }
                    
                    points.push([xstart, base+this.barWidth/2]);
                    points.push([gridData[i][0], base+this.barWidth/2]);
                    points.push([gridData[i][0], base-this.barWidth/2]);
                    points.push([xstart, base-this.barWidth/2]);
                    // now draw the shadows if not stacked.
                    // for stacked plots, they are predrawn by drawShadow
                    if (shadow && !this._stack) {
                        this.renderer.shadowRenderer.draw(ctx, points, opts);
                    }
                    this.renderer.shapeRenderer.draw(ctx, points, opts); 
                }  
            }
        }                

    };
    
     
    // for stacked plots, shadows will be pre drawn by drawShadow.
    $.jqplot.BarRenderer.prototype.drawShadow = function(ctx, gridData, options) {
        var i;
        var opts = (options != undefined) ? options : {};
        var shadow = (opts.shadow != undefined) ? opts.shadow : this.shadow;
        var showLine = (opts.showLine != undefined) ? opts.showLine : this.showLine;
        var fill = (opts.fill != undefined) ? opts.fill : this.fill;
        var xaxis = this.xaxis;
        var yaxis = this.yaxis;
        var xp = this._xaxis.series_u2p;
        var yp = this._yaxis.series_u2p;
        var pointx, pointy, nvals, nseries, pos;
        
        if (this._stack && this.shadow) {
            if (this.barWidth == null) {
                this.renderer.setBarWidth.call(this);
            }
        
            var temp = this.renderer.calcSeriesNumbers.call(this);
            nvals = temp[0];
            nseries = temp[1];
            pos = temp[2];
        
            if (this._stack) {
                this._barNudge = 0;
            }
            else {
                this._barNudge = (-Math.abs(nseries/2 - 0.5) + pos) * (this.barWidth + this.barPadding);
            }
            if (showLine) {
            
                if (this.barDirection == 'vertical') {
                    for (var i=0; i<gridData.length; i++) {
                        points = [];
                        var base = gridData[i][0] + this._barNudge;
                        var ystart;
                    
                        if (this._stack && this._prevGridData.length) {
                            ystart = this._prevGridData[i][1];
                        }
                        else {
                            if (this.fillToZero) {
                                ystart = this._yaxis.series_u2p(0);
                            }
                            else {
                                ystart = ctx.canvas.height;
                            }
                        }
                    
                        points.push([base-this.barWidth/2, ystart]);
                        points.push([base-this.barWidth/2, gridData[i][1]]);
                        points.push([base+this.barWidth/2, gridData[i][1]]);
                        points.push([base+this.barWidth/2, ystart]);
                        this.renderer.shadowRenderer.draw(ctx, points, opts);
                    }
                }
            
                else if (this.barDirection == 'horizontal'){
                    for (var i=0; i<gridData.length; i++) {
                        points = [];
                        var base = gridData[i][1] - this._barNudge;
                        var xstart;
                    
                        if (this._stack && this._prevGridData.length) {
                            xstart = this._prevGridData[i][0];
                        }
                        else {
                            xstart = 0;
                        }
                    
                        points.push([xstart, base+this.barWidth/2]);
                        points.push([gridData[i][0], base+this.barWidth/2]);
                        points.push([gridData[i][0], base-this.barWidth/2]);
                        points.push([xstart, base-this.barWidth/2]);
                        this.renderer.shadowRenderer.draw(ctx, points, opts);
                    }  
                }
            }   
            
        }
                     

    };
})(jQuery);