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/**!
 * easyPieChart
 * Lightweight plugin to render simple, animated and retina optimized pie charts
 *
 * @license 
 * @author Robert Fleischmann <rendro87@gmail.com> (http://robert-fleischmann.de)
 * @version 2.1.5
 **/

(function(root, factory) {
    if(typeof exports === 'object') {
        module.exports = factory(require('jquery'));
    }
    else if(typeof define === 'function' && define.amd) {
        define(['jquery'], factory);
    }
    else {
        factory(root.jQuery);
    }
}(this, function($) {

/**
 * Renderer to render the chart on a canvas object
 * @param {DOMElement} el      DOM element to host the canvas (root of the plugin)
 * @param {object}     options options object of the plugin
 */
var CanvasRenderer = function(el, options) {
        var cachedBackground;
        var canvas = document.createElement('canvas');

        el.appendChild(canvas);

        if (typeof(G_vmlCanvasManager) !== 'undefined') {
                G_vmlCanvasManager.initElement(canvas);
        }

        var ctx = canvas.getContext('2d');

        canvas.width = canvas.height = options.size;

        // canvas on retina devices
        var scaleBy = 1;
        if (window.devicePixelRatio > 1) {
                scaleBy = window.devicePixelRatio;
                canvas.style.width = canvas.style.height = [options.size, 'px'].join('');
                canvas.width = canvas.height = options.size * scaleBy;
                ctx.scale(scaleBy, scaleBy);
        }

        // move 0,0 coordinates to the center
        ctx.translate(options.size / 2, options.size / 2);

        // rotate canvas -90deg
        ctx.rotate((-1 / 2 + options.rotate / 180) * Math.PI);

        var radius = (options.size - options.lineWidth) / 2;
        if (options.scaleColor && options.scaleLength) {
                radius -= options.scaleLength + 2; // 2 is the distance between scale and bar
        }

        // IE polyfill for Date
        Date.now = Date.now || function() {
                return +(new Date());
        };

        /**
         * Draw a circle around the center of the canvas
         * @param {strong} color     Valid CSS color string
         * @param {number} lineWidth Width of the line in px
         * @param {number} percent   Percentage to draw (float between -1 and 1)
         */
        var drawCircle = function(color, lineWidth, percent) {
                percent = Math.min(Math.max(-1, percent || 0), 1);
                var isNegative = percent <= 0 ? true : false;

                ctx.beginPath();
                ctx.arc(0, 0, radius, 0, Math.PI * 2 * percent, isNegative);

                ctx.strokeStyle = color;
                ctx.lineWidth = lineWidth;

                ctx.stroke();
        };

        /**
         * Draw the scale of the chart
         */
        var drawScale = function() {
                var offset;
                var length;

                ctx.lineWidth = 1;
                ctx.fillStyle = options.scaleColor;

                ctx.save();
                for (var i = 24; i > 0; --i) {
                        if (i % 6 === 0) {
                                length = options.scaleLength;
                                offset = 0;
                        } else {
                                length = options.scaleLength * 0.6;
                                offset = options.scaleLength - length;
                        }
                        ctx.fillRect(-options.size/2 + offset, 0, length, 1);
                        ctx.rotate(Math.PI / 12);
                }
                ctx.restore();
        };

        /**
         * Request animation frame wrapper with polyfill
         * @return {function} Request animation frame method or timeout fallback
         */
        var reqAnimationFrame = (function() {
                return  window.requestAnimationFrame ||
                                window.webkitRequestAnimationFrame ||
                                window.mozRequestAnimationFrame ||
                                function(callback) {
                                        window.setTimeout(callback, 1000 / 60);
                                };
        }());

        /**
         * Draw the background of the plugin including the scale and the track
         */
        var drawBackground = function() {
                if(options.scaleColor) drawScale();
                if(options.trackColor) drawCircle(options.trackColor, options.lineWidth, 1);
        };

  /**
    * Canvas accessor
   */
  this.getCanvas = function() {
    return canvas;
  };
  
  /**
    * Canvas 2D context 'ctx' accessor
   */
  this.getCtx = function() {
    return ctx;
  };

        /**
         * Clear the complete canvas
         */
        this.clear = function() {
                ctx.clearRect(options.size / -2, options.size / -2, options.size, options.size);
        };

        /**
         * Draw the complete chart
         * @param {number} percent Percent shown by the chart between -100 and 100
         */
        this.draw = function(percent) {
                // do we need to render a background
                if (!!options.scaleColor || !!options.trackColor) {
                        // getImageData and putImageData are supported
                        if (ctx.getImageData && ctx.putImageData) {
                                if (!cachedBackground) {
                                        drawBackground();
                                        cachedBackground = ctx.getImageData(0, 0, options.size * scaleBy, options.size * scaleBy);
                                } else {
                                        ctx.putImageData(cachedBackground, 0, 0);
                                }
                        } else {
                                this.clear();
                                drawBackground();
                        }
                } else {
                        this.clear();
                }

                ctx.lineCap = options.lineCap;

                // if barcolor is a function execute it and pass the percent as a value
                var color;
                if (typeof(options.barColor) === 'function') {
                        color = options.barColor(percent);
                } else {
                        color = options.barColor;
                }

                // draw bar
                drawCircle(color, options.lineWidth, percent / 100);
        }.bind(this);

        /**
         * Animate from some percent to some other percentage
         * @param {number} from Starting percentage
         * @param {number} to   Final percentage
         */
        this.animate = function(from, to) {
                var startTime = Date.now();
                options.onStart(from, to);
                var animation = function() {
                        var process = Math.min(Date.now() - startTime, options.animate.duration);
                        var currentValue = options.easing(this, process, from, to - from, options.animate.duration);
                        this.draw(currentValue);
                        options.onStep(from, to, currentValue);
                        if (process >= options.animate.duration) {
                                options.onStop(from, to);
                        } else {
                                reqAnimationFrame(animation);
                        }
                }.bind(this);

                reqAnimationFrame(animation);
        }.bind(this);
};

var EasyPieChart = function(el, opts) {
        var defaultOptions = {
                barColor: '#ef1e25',
                trackColor: '#f9f9f9',
                scaleColor: '#dfe0e0',
                scaleLength: 5,
                lineCap: 'round',
                lineWidth: 3,
                size: 110,
                rotate: 0,
                animate: {
                        duration: 1000,
                        enabled: true
                },
                easing: function (x, t, b, c, d) { // more can be found here: http://gsgd.co.uk/sandbox/jquery/easing/
                        t = t / (d/2);
                        if (t < 1) {
                                return c / 2 * t * t + b;
                        }
                        return -c/2 * ((--t)*(t-2) - 1) + b;
                },
                onStart: function(from, to) {
                        return;
                },
                onStep: function(from, to, currentValue) {
                        return;
                },
                onStop: function(from, to) {
                        return;
                }
        };

        // detect present renderer
        if (typeof(CanvasRenderer) !== 'undefined') {
                defaultOptions.renderer = CanvasRenderer;
        } else if (typeof(SVGRenderer) !== 'undefined') {
                defaultOptions.renderer = SVGRenderer;
        } else {
                throw new Error('Please load either the SVG- or the CanvasRenderer');
        }

        var options = {};
        var currentValue = 0;

        /**
         * Initialize the plugin by creating the options object and initialize rendering
         */
        var init = function() {
                this.el = el;
                this.options = options;

                // merge user options into default options
                for (var i in defaultOptions) {
                        if (defaultOptions.hasOwnProperty(i)) {
                                options[i] = opts && typeof(opts[i]) !== 'undefined' ? opts[i] : defaultOptions[i];
                                if (typeof(options[i]) === 'function') {
                                        options[i] = options[i].bind(this);
                                }
                        }
                }

                // check for jQuery easing
                if (typeof(options.easing) === 'string' && typeof(jQuery) !== 'undefined' && jQuery.isFunction(jQuery.easing[options.easing])) {
                        options.easing = jQuery.easing[options.easing];
                } else {
                        options.easing = defaultOptions.easing;
                }

                // process earlier animate option to avoid bc breaks
                if (typeof(options.animate) === 'number') {
                        options.animate = {
                                duration: options.animate,
                                enabled: true
                        };
                }

                if (typeof(options.animate) === 'boolean' && !options.animate) {
                        options.animate = {
                                duration: 1000,
                                enabled: options.animate
                        };
                }

                // create renderer
                this.renderer = new options.renderer(el, options);

                // initial draw
                this.renderer.draw(currentValue);

                // initial update
                if (el.dataset && el.dataset.percent) {
                        this.update(parseFloat(el.dataset.percent));
                } else if (el.getAttribute && el.getAttribute('data-percent')) {
                        this.update(parseFloat(el.getAttribute('data-percent')));
                }
        }.bind(this);

        /**
         * Update the value of the chart
         * @param  {number} newValue Number between 0 and 100
         * @return {object}          Instance of the plugin for method chaining
         */
        this.update = function(newValue) {
                newValue = parseFloat(newValue);
                if (options.animate.enabled) {
                        this.renderer.animate(currentValue, newValue);
                } else {
                        this.renderer.draw(newValue);
                }
                currentValue = newValue;
                return this;
        }.bind(this);

        /**
         * Disable animation
         * @return {object} Instance of the plugin for method chaining
         */
        this.disableAnimation = function() {
                options.animate.enabled = false;
                return this;
        };

        /**
         * Enable animation
         * @return {object} Instance of the plugin for method chaining
         */
        this.enableAnimation = function() {
                options.animate.enabled = true;
                return this;
        };

        init();
};

$.fn.easyPieChart = function(options) {
        return this.each(function() {
                var instanceOptions;

                if (!$.data(this, 'easyPieChart')) {
                        instanceOptions = $.extend({}, options, $(this).data());
                        $.data(this, 'easyPieChart', new EasyPieChart(this, instanceOptions));
                }
        });
};


}));