/**
    * o------------------------------------------------------------------------------o
    * | This file is part of the RGraph package - you can learn more at:             |
    * |                                                                              |
    * |                          http://www.rgraph.net                               |
    * |                                                                              |
    * | This package is licensed under the RGraph license. For all kinds of business |
    * | purposes there is a small one-time licensing fee to pay and for non          |
    * | commercial  purposes it is free to use. You can read the full license here:  |
    * |                                                                              |
    * |                      http://www.rgraph.net/LICENSE.txt                       |
    * o------------------------------------------------------------------------------o
    */
    
    if (typeof(RGraph) == 'undefined') RGraph = {};

    /**
    * Draws the graph key (used by various graphs)
    * 
    * @param object obj The graph object
    * @param array  key An array of the texts to be listed in the key
    * @param colors An array of the colors to be used
    */
    RGraph.DrawKey = function (obj, key, colors)
    {
        var canvas  = obj.canvas;
        var context = obj.context;
        context.lineWidth = 1;

        context.beginPath();

        /**
        * Key positioned in the gutter
        */
        var keypos   = obj.Get('chart.key.position');
        var textsize = obj.Get('chart.text.size');

        /**
        * Change the older chart.key.vpos to chart.key.position.y
        */
        if (typeof(obj.Get('chart.key.vpos')) == 'number') {
            obj.Set('chart.key.position.y', obj.Get('chart.key.vpos') * this.Get('chart.gutter.top') );
        }

        /**
        * Account for null values in the key
        */
        var key_non_null    = [];
        var colors_non_null = [];
        for (var i=0; i<key.length; ++i) {
            if (key[i] != null) {
                colors_non_null.push(colors[i]);
                key_non_null.push(key[i]);
            }
        }
        
        key    = key_non_null;
        colors = colors_non_null;



        if (keypos && keypos == 'gutter') {
    
            RGraph.DrawKey_gutter(obj, key, colors);


        /**
        * In-graph style key
        */
        } else if (keypos && keypos == 'graph') {

            RGraph.DrawKey_graph(obj, key, colors);
        
        } else {
            alert('[COMMON] (' + obj.id + ') Unknown key position: ' + keypos);
        }
    }





    /**
    * This does the actual drawing of the key when it's in the graph
    * 
    * @param object obj The graph object
    * @param array  key The key items to draw
    * @param array colors An aray of colors that the key will use
    */
    RGraph.DrawKey_graph = function (obj, key, colors)
    {
        var canvas      = obj.canvas;
        var context     = obj.context;
        var text_size   = typeof(obj.Get('chart.key.text.size')) == 'number' ? obj.Get('chart.key.text.size') : obj.Get('chart.text.size');
        var text_font   = obj.Get('chart.text.font');
        
        var gutterLeft   = obj.Get('chart.gutter.left');
        var gutterRight  = obj.Get('chart.gutter.right');
        var gutterTop    = obj.Get('chart.gutter.top');
        var gutterBottom = obj.Get('chart.gutter.bottom');

        var hpos        = obj.Get('chart.yaxispos') == 'right' ? gutterLeft + 10 : RGraph.GetWidth(obj) - gutterRight - 10;
        var vpos        = gutterTop + 10;
        var title       = obj.Get('chart.title');
        var blob_size   = text_size; // The blob of color
        var hmargin      = 8; // This is the size of the gaps between the blob of color and the text
        var vmargin      = 4; // This is the vertical margin of the key
        var fillstyle    = obj.Get('chart.key.background');
        var strokestyle  = '#333';
        var height       = 0;
        var width        = 0;

        if (!obj.coords) obj.coords = {};
        obj.coords.key = [];


        // Need to set this so that measuring the text works out OK
        context.font = text_size + 'pt ' + obj.Get('chart.text.font');

        // Work out the longest bit of text
        for (i=0; i<key.length; ++i) {
            width = Math.max(width, context.measureText(key[i]).width);
        }

        width += 5;
        width += blob_size;
        width += 5;
        width += 5;
        width += 5;

        /**
        * Now we know the width, we can move the key left more accurately
        */
        if (   obj.Get('chart.yaxispos') == 'left'
            || (obj.type == 'pie' && !obj.Get('chart.yaxispos'))
            || (obj.type == 'hbar' && !obj.Get('chart.yaxispos'))
            || (obj.type == 'hbar' && obj.Get('chart.yaxispos') == 'center')
            || (obj.type == 'rscatter' && !obj.Get('chart.yaxispos'))
            || (obj.type == 'radar' && !obj.Get('chart.yaxispos'))
            || (obj.type == 'rose' && !obj.Get('chart.yaxispos'))
            || (obj.type == 'funnel' && !obj.Get('chart.yaxispos'))
            || (obj.type == 'vprogress' && !obj.Get('chart.yaxispos'))
            || (obj.type == 'hprogress' && !obj.Get('chart.yaxispos'))
           ) {

            hpos -= width;
        }

        /**
        * Horizontal alignment
        */
        if (typeof(obj.Get('chart.key.halign')) == 'string') {
            if (obj.Get('chart.key.halign') == 'left') {
                hpos = gutterLeft + 10;
            } else if (obj.Get('chart.key.halign') == 'right') {
                hpos = RGraph.GetWidth(obj) - gutterRight  - width;
            }
        }

        /**
        * Specific location coordinates
        */
        if (typeof(obj.Get('chart.key.position.x')) == 'number') {
            hpos = obj.Get('chart.key.position.x');
        }
        
        if (typeof(obj.Get('chart.key.position.y')) == 'number') {
            vpos = obj.Get('chart.key.position.y');
        }


        // Stipulate the shadow for the key box
        if (obj.Get('chart.key.shadow')) {
            context.shadowColor   = obj.Get('chart.key.shadow.color');
            context.shadowBlur    = obj.Get('chart.key.shadow.blur');
            context.shadowOffsetX = obj.Get('chart.key.shadow.offsetx');
            context.shadowOffsetY = obj.Get('chart.key.shadow.offsety');
        }




        // Draw the box that the key resides in
        context.beginPath();
            context.fillStyle   = obj.Get('chart.key.background');
            context.strokeStyle = 'black';

        if (typeof(obj.Get('chart.key.position.graph.boxed')) == 'undefined' || (typeof(obj.Get('chart.key.position.graph.boxed')) == 'boolean' && obj.Get('chart.key.position.graph.boxed')) ) {
            if (arguments[3] != false) {
    
                context.lineWidth = typeof(obj.Get('chart.key.linewidth')) == 'number' ? obj.Get('chart.key.linewidth') : 1;
    
                // The older square rectangled key
                if (obj.Get('chart.key.rounded') == true) {
                    context.beginPath();
                        context.strokeStyle = strokestyle;
                        RGraph.strokedCurvyRect(context, AA(this, hpos), AA(this, vpos), width - 5, 5 + ( (text_size + 5) * RGraph.getKeyLength(key)),4);
            
                    context.stroke();
                    context.fill();
            
                    RGraph.NoShadow(obj);
            
                } else {
                    context.strokeRect(AA(this, hpos), AA(this, vpos), width - 5, 5 + ( (text_size + 5) * RGraph.getKeyLength(key)));
                    context.fillRect(AA(this, hpos), AA(this, vpos), width - 5, 5 + ( (text_size + 5) * RGraph.getKeyLength(key)));
                }
            }
        }

        RGraph.NoShadow(obj);

        context.beginPath();

            /**
            * Custom colors for the key
            */
            if (obj.Get('chart.key.colors')) {
                colors = obj.Get('chart.key.colors');
            }

            // Draw the labels given
            for (var i=key.length - 1; i>=0; i--) {
            
                var j = Number(i) + 1;

                // Draw the blob of color
                if (obj.Get('chart.key.color.shape') == 'circle') {
                    context.beginPath();
                        context.strokeStyle = 'rgba(0,0,0,0)';
                        context.fillStyle = colors[i];
                        context.arc(hpos + 5 + (blob_size / 2), vpos + (5 * j) + (text_size * j) - text_size + (blob_size / 2), blob_size / 2, 0, 6.26, 0);
                    context.fill();
                
                } else if (obj.Get('chart.key.color.shape') == 'line') {
                    context.beginPath();
                        context.strokeStyle = colors[i];
                        context.moveTo(hpos + 5, vpos + (5 * j) + (text_size * j) - text_size + (blob_size / 2));
                        context.lineTo(hpos + blob_size + 5, vpos + (5 * j) + (text_size * j) - text_size + (blob_size / 2));
                    context.stroke();

                } else {
                    context.fillStyle =  colors[i];
                    context.fillRect(hpos + 5, vpos + (5 * j) + (text_size * j) - text_size, text_size, text_size + 1);
                }

                context.beginPath();
            
                context.fillStyle = 'black';
            
                RGraph.Text(context,
                            text_font,
                            text_size,
                            hpos + blob_size + 5 + 5,
                            vpos + (5 * j) + (text_size * j),
                            key[i]);

                if (obj.Get('chart.key.interactive')) {
                
                    var px = hpos + 5;
                    var py = vpos + (5 * j) + (text_size * j) - text_size;
                    var pw = width - 5 - 5 - 5;
                    var ph = text_size;
                    
                    
                    obj.coords.key.push([px, py, pw, ph]);
                }

            }
        context.fill();

        /**
        * Install the interactivity event handler
        */
        if (obj.Get('chart.key.interactive')) {
        
            InteractiveKey_line_mousemove = function (e)
            {
                var objects = RGraph.ObjectRegistry.getObjectsByCanvasID(e.target.id);

                for (var i=0; i<objects.length; ++i) {
                
                    var obj = objects[i];

                    var mouseXY = RGraph.getMouseXY(e);
                    var mouseX  = mouseXY[0];
                    var mouseY  = mouseXY[1];

                    if (obj.coords.key && obj.coords.key.length) {
                        for (var i=0; i<obj.coords.key.length; ++i) {
                        
                            var px = obj.coords.key[i][0];
                            var py = obj.coords.key[i][1];
                            var pw = obj.coords.key[i][2];
                            var ph = obj.coords.key[i][3];

                            if (mouseX > (px-2) && mouseX < (px + pw + 2) && mouseY > (py - 2) && mouseY < (py + ph + 2) ) {
                                mouse_over_key = true;
                                return;
                            }
                            
                            mouse_over_key = false;
    
                            if (typeof(obj.Get('chart.tooltips')) == 'object' && typeof(canvas_onmousemove_func) == 'function') {
                                canvas_onmousemove_func(e);
                            }
                        }
                    }
                }
            }











            InteractiveKey_line_mouseup = function (e)
            {
                //var obj = RGraph.ObjectRegistry.getObjectByXY(e);
                var objects = RGraph.ObjectRegistry.getObjectsByCanvasID(e.target.id);
                
                for (var i=0; i<objects.length; ++i) {
                
                    var obj = objects[i]

                    if (!RGraph.is_null(obj) && obj.type == 'line') {
    
                        var mouseXY = RGraph.getMouseXY(e);
                        var mouseX  = mouseXY[0];
                        var mouseY  = mouseXY[1];
    
                        RGraph.DrawKey(obj, obj.Get('chart.key'), obj.Get('chart.colors'));
                
                        for (var i=0; i<obj.coords.key.length; ++i) {
                        
                            var px = obj.coords.key[i][0];
                            var py = obj.coords.key[i][1];
                            var pw = obj.coords.key[i][2];
                            var ph = obj.coords.key[i][3];
                
                            if ( mouseX > (px - 2) && mouseX < (px + pw + 2) && mouseY > (py - 2) && mouseY < (py + ph + 2) ) {
        
                                /**
                                * Redraw the chart
                                */
                                RGraph.RedrawCanvas(obj.canvas);
    
                                var index = obj.coords.key.length - i - 1;
    
                                // Cover the canvas...
                                obj.context.beginPath();
                                    obj.context.fillStyle = 'rgba(255,255,255,0.9)';
                                    obj.context.fillRect(obj.Get('chart.gutter.left') + 1,obj.Get('chart.gutter.top'),obj.canvas.width, canvas.height - obj.Get('chart.gutter.bottom') - obj.Get('chart.gutter.top'));
                                obj.context.fill();
    
                                // ...and highlight the line
                                obj.context.beginPath();
                                    if (obj.Get('chart.shadow')) {
                                        if (typeof(obj.Get('chart.shadow.color')) == 'string') {
                                            RGraph.SetShadow(obj, obj.Get('chart.shadow.color'), obj.Get('chart.shadow.offsetx'), obj.Get('chart.shadow.offsety'), obj.Get('chart.shadow.blur'));
                                        } else {
                                            RGraph.SetShadow(obj, obj.Get('chart.shadow.color')[obj.Get('chart.shadow.color').length - 1 - i], obj.Get('chart.shadow.offsetx'), obj.Get('chart.shadow.offsety'), obj.Get('chart.shadow.blur'));
                                        }
                                    }
    
                                    obj.context.strokeStyle = obj.Get('chart.colors')[index];
                                    obj.context.lineWidth  = obj.Get('chart.linewidth');
                                    if (obj.coords2 &&obj.coords2[index] &&obj.coords2[index].length) {
                                        for (var j=0; j<obj.coords2[index].length; ++j) {
                                            
                                            var x     = obj.coords2[index][j][0];
                                            var y     = obj.coords2[index][j][1];
                                            var prevY = obj.coords2[index][j - 1] && obj.coords2[index][j - 1][1]
                                        
                                            if (j == 0 || y == null || prevY == null) {
                                                obj.context.moveTo(x, y);
                                            } else {
                                                obj.context.lineTo(x, y);
                                            }
                                        }
                                    }
                                obj.context.stroke();
        
                                // Add the key highlight
                                obj.context.lineWidth  = 1;
                                obj.context.beginPath();
                                    obj.context.strokeStyle = 'black';
                                    obj.context.fillStyle   = 'white';
                                    
                                    RGraph.SetShadow(obj, 'rgba(0,0,0,0.5)', 0,0,10);
        
                                    obj.context.strokeRect(px - 2, py - 2, pw + 4, ph + 4);
                                    obj.context.fillRect(px - 2, py - 2, pw + 4, ph + 4);
        
                                obj.context.stroke();
                                obj.context.fill();
        
        
                                RGraph.NoShadow(obj);
        
        
                                obj.context.beginPath();
                                    obj.context.fillStyle = obj.Get('chart.colors')[index];
                                    obj.context.fillRect(px, py, blob_size, blob_size);
                                obj.context.fill();
        
                                obj.context.beginPath();
                                    obj.context.fillStyle = obj.Get('chart.text.color');
                                
                                    RGraph.Text(obj.context,
                                                obj.Get('chart.text.font'),
                                                obj.Get('chart.text.size'),
                                                px + 5 + blob_size,
                                                py + ph,
                                                obj.Get('chart.key')[obj.Get('chart.key').length - i - 1]
                                               );
                                context.fill();
        
                
                                obj.canvas.style.cursor = 'pointer';
                                
                                e.cancelBubble = true;
                                e.stopPropagation();
                            }
                            
                            canvas.style.cursor = 'default';
                        }
                    }
                }
            }




















            /**
            * Interactive key mouseup for the pie
            */
            InteractiveKey_pie_mousemove = function (e)
            {
                // Simply call the line chart key mousemove function as it's the same
                InteractiveKey_line_mousemove(e);
            }



            /**
            * This function handles the Pie chart interactive key (the click event)
            * 
            * @param object e The event object
            */
            InteractiveKey_pie_mouseup = function (e)
            {
                // MUST go through all of the objects as the keys could be placed anywhere on the
                // canvas - not just withing the gutter region
                var objects = RGraph.ObjectRegistry.objects.byCanvasID;

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

                    if (objects[i][0] == e.target.id && objects[i][1].type == 'pie') {
                        
                        var obj = objects[i][1];

                        var mouseXY = RGraph.getMouseXY(e);
                        var mouseX  = mouseXY[0];
                        var mouseY  = mouseXY[1];

                        if (obj.coords.key && obj.coords.key.length) {
                            for (var i=0; i<obj.coords.key.length; ++i) {
    
                                var index = obj.coords.key.length - i - 1;
    
                                var px = obj.coords.key[i][0];
                                var py = obj.coords.key[i][1];
                                var pw = obj.coords.key[i][2];
                                var ph = obj.coords.key[i][3];
        
                                if (mouseX >= (px - 2) && mouseX <= (px + pw + 2) && mouseY >= (py - 2) && mouseY <= (py + ph + 2)) {
                                
                                    RGraph.RedrawCanvas(obj.canvas);
    
                                    // First cover the canvas in a semi-transparent layer
                                    obj.context.beginPath();
                                        obj.context.fillStyle = 'rgba(255,255,255,0.9)';
                                        obj.context.fillRect(0,0,obj.canvas.width,obj.canvas.height);
                                    obj.context.fill();
                                    
                                    // Highllight the segment
                                    var segment = obj.angles[index];
                                    
                                    obj.context.beginPath();
                                        RGraph.SetShadow(obj,'gray',0,0,15);
                                        obj.context.fillStyle = obj.Get('chart.colors')[index];
                                        obj.context.moveTo(obj.angles[index][2], obj.angles[index][3]);
                                        obj.context.arc(obj.angles[index][2], obj.angles[index][3], obj.radius, segment[0], segment[1], false);
                                    obj.context.closePath();
                                    obj.context.fill();
    
                                    // Highlight the key
                                    obj.context.lineWidth  = 1;
                                    obj.context.beginPath();
                                        obj.context.strokeStyle = 'black';
                                        obj.context.fillStyle   = 'white';
                                        
                                        RGraph.SetShadow(obj, 'rgba(0,0,0,0.5)', 0,0,10);
            
                                        obj.context.strokeRect(px - 2, py - 2, pw + 4, ph + 4);
                                        obj.context.fillRect(px - 2, py - 2, pw + 4, ph + 4);
                                    obj.context.stroke();
                                    obj.context.fill();
                                    
                                    // Turn off the shadow again
                                    RGraph.NoShadow(obj);
    
                                    // Add the blob of color
                                    obj.context.beginPath();
                                        obj.context.fillStyle = obj.Get('chart.colors')[index];
                                        obj.context.fillRect(px, py, blob_size, blob_size);
                                    obj.context.fill();
        
                                    // And add the text
                                    obj.context.beginPath();
                                        obj.context.fillStyle = obj.Get('chart.text.color');
                                    
                                        RGraph.Text(obj.context,
                                                    obj.Get('chart.text.font'),
                                                    obj.Get('chart.text.size'),
                                                    px + 5 + blob_size,
                                                    py + ph,
                                                    obj.Get('chart.key')[obj.Get('chart.key').length - i - 1]
                                                   );
                                    context.fill();
    
                                    e.stopPropagation();
                                    return;
                                }
                            }
                        }
                    }
                }
            }
        }
    }






    /**
    * This does the actual drawing of the key when it's in the gutter
    * 
    * @param object obj The graph object
    * @param array  key The key items to draw
    * @param array colors An aray of colors that the key will use
    */
    RGraph.DrawKey_gutter = function (obj, key, colors)
    {
        var canvas      = obj.canvas;
        var context     = obj.context;
        var text_size   = typeof(obj.Get('chart.key.text.size')) == 'number' ? obj.Get('chart.key.text.size') : obj.Get('chart.text.size');
        var text_font   = obj.Get('chart.text.font');
        
        var gutterLeft   = obj.gutterLeft;
        var gutterRight  = obj.gutterRight;
        var gutterTop    = obj.gutterTop;
        var gutterBottom = obj.gutterBottom;

        var hpos        = ((obj.canvas.width - obj.gutterLeft - obj.gutterRight) / 2) + obj.gutterLeft;
        var vpos        = gutterTop - text_size - 5;
        var title       = obj.Get('chart.title');
        var blob_size   = text_size; // The blob of color
        var hmargin      = 8; // This is the size of the gaps between the blob of color and the text
        var vmargin      = 4; // This is the vertical margin of the key
        var fillstyle   = obj.Get('chart.key.background');
        var strokestyle = '#999';
        var length      = 0;



        // Need to work out the length of the key first
        context.font = text_size + 'pt ' + text_font;
        for (i=0; i<key.length; ++i) {
            length += hmargin;
            length += blob_size;
            length += hmargin;
            length += context.measureText(key[i]).width;
        }
        length += hmargin;




        /**
        * Work out hpos since in the Pie it isn't necessarily dead center
        */
        if (obj.type == 'pie') {
            if (obj.Get('chart.align') == 'left') {
                var hpos = obj.radius + gutterLeft;
                
            } else if (obj.Get('chart.align') == 'right') {
                var hpos = obj.canvas.width - obj.radius - gutterRight;

            } else {
                hpos = canvas.width / 2;
            }
        }





        /**
        * This makes the key centered
        */  
        hpos -= (length / 2);


        /**
        * Override the horizontal/vertical positioning
        */
        if (typeof(obj.Get('chart.key.position.x')) == 'number') {
            hpos = obj.Get('chart.key.position.x');
        }
        if (typeof(obj.Get('chart.key.position.y')) == 'number') {
            vpos = obj.Get('chart.key.position.y');
        }



        /**
        * Draw the box that the key sits in
        */
        if (obj.Get('chart.key.position.gutter.boxed')) {

            if (obj.Get('chart.key.shadow')) {
                context.shadowColor   = obj.Get('chart.key.shadow.color');
                context.shadowBlur    = obj.Get('chart.key.shadow.blur');
                context.shadowOffsetX = obj.Get('chart.key.shadow.offsetx');
                context.shadowOffsetY = obj.Get('chart.key.shadow.offsety');
            }

            
            context.beginPath();
                context.fillStyle = fillstyle;
                context.strokeStyle = strokestyle;

                if (obj.Get('chart.key.rounded')) {
                    RGraph.strokedCurvyRect(context, hpos, vpos - vmargin, length, text_size + vmargin + vmargin)
                    // Odd... RGraph.filledCurvyRect(context, hpos, vpos - vmargin, length, text_size + vmargin + vmargin);
                } else {
                    context.strokeRect(hpos, vpos - vmargin, length, text_size + vmargin + vmargin);
                    context.fillRect(hpos, vpos - vmargin, length, text_size + vmargin + vmargin);
                }
                
            context.stroke();
            context.fill();


            RGraph.NoShadow(obj);
        }


        /**
        * Draw the blobs of color and the text
        */

        // Custom colors for the key
        if (obj.Get('chart.key.colors')) {
            colors = obj.Get('chart.key.colors');
        }

        for (var i=0, pos=hpos; i<key.length; ++i) {
            pos += hmargin;
            
            // Draw the blob of color - line
            if (obj.Get('chart.key.color.shape') =='line') {
                
                context.beginPath();
                    context.strokeStyle = colors[i];
                    context.moveTo(pos, vpos + (blob_size / 2));
                    context.lineTo(pos + blob_size, vpos + (blob_size / 2));
                context.stroke();
                
            // Circle
            } else if (obj.Get('chart.key.color.shape') == 'circle') {
                
                context.beginPath();
                    context.fillStyle = colors[i];
                    context.moveTo(pos, vpos + (blob_size / 2));
                    context.arc(pos + (blob_size / 2), vpos + (blob_size / 2), (blob_size / 2), 0, 6.28, 0);
                context.fill();


            } else {

                context.beginPath();
                    context.fillStyle = colors[i];
                    context.fillRect(pos, vpos, blob_size, blob_size);
                context.fill();
            }

            pos += blob_size;
            
            pos += hmargin;

            context.beginPath();
                context.fillStyle = 'black';
                RGraph.Text(context, text_font, text_size, pos, vpos + text_size - 1, key[i]);
            context.fill();
            pos += context.measureText(key[i]).width;
        }
    }
    
    
    /**
    * Returns the key length, but accounts for null values
    * 
    * @param array key The key elements
    */
    RGraph.getKeyLength = function (key)
    {
        var len = 0;

        for (var i=0; i<key.length; ++i) {
            if (key[i] != null) {
                ++len;
            }
        }

        return len;
    }