/*
 * Chartkick.js
 * Create beautiful charts with one line of JavaScript
 * https://github.com/ankane/chartkick.js
 * v2.2.0
 * MIT License
 */

/*jslint browser: true, indent: 2, plusplus: true, vars: true */

(function (window) {
  'use strict';

  var config = window.Chartkick || {};
  var Chartkick, ISO8601_PATTERN, DECIMAL_SEPARATOR, adapters = [];
  var DATE_PATTERN = /^(\d\d\d\d)(\-)?(\d\d)(\-)?(\d\d)$/i;
  var GoogleChartsAdapter, HighchartsAdapter, ChartjsAdapter;

  // helpers

  function isArray(variable) {
    return Object.prototype.toString.call(variable) === "[object Array]";
  }

  function isFunction(variable) {
    return variable instanceof Function;
  }

  function isPlainObject(variable) {
    return !isFunction(variable) && variable instanceof Object;
  }

  // https://github.com/madrobby/zepto/blob/master/src/zepto.js
  function extend(target, source) {
    var key;
    for (key in source) {
      if (isPlainObject(source[key]) || isArray(source[key])) {
        if (isPlainObject(source[key]) && !isPlainObject(target[key])) {
          target[key] = {};
        }
        if (isArray(source[key]) && !isArray(target[key])) {
          target[key] = [];
        }
        extend(target[key], source[key]);
      } else if (source[key] !== undefined) {
        target[key] = source[key];
      }
    }
  }

  function merge(obj1, obj2) {
    var target = {};
    extend(target, obj1);
    extend(target, obj2);
    return target;
  }

  // https://github.com/Do/iso8601.js
  ISO8601_PATTERN = /(\d\d\d\d)(\-)?(\d\d)(\-)?(\d\d)(T)?(\d\d)(:)?(\d\d)?(:)?(\d\d)?([\.,]\d+)?($|Z|([\+\-])(\d\d)(:)?(\d\d)?)/i;
  DECIMAL_SEPARATOR = String(1.5).charAt(1);

  function parseISO8601(input) {
    var day, hour, matches, milliseconds, minutes, month, offset, result, seconds, type, year;
    type = Object.prototype.toString.call(input);
    if (type === "[object Date]") {
      return input;
    }
    if (type !== "[object String]") {
      return;
    }
    matches = input.match(ISO8601_PATTERN);
    if (matches) {
      year = parseInt(matches[1], 10);
      month = parseInt(matches[3], 10) - 1;
      day = parseInt(matches[5], 10);
      hour = parseInt(matches[7], 10);
      minutes = matches[9] ? parseInt(matches[9], 10) : 0;
      seconds = matches[11] ? parseInt(matches[11], 10) : 0;
      milliseconds = matches[12] ? parseFloat(DECIMAL_SEPARATOR + matches[12].slice(1)) * 1000 : 0;
      result = Date.UTC(year, month, day, hour, minutes, seconds, milliseconds);
      if (matches[13] && matches[14]) {
        offset = matches[15] * 60;
        if (matches[17]) {
          offset += parseInt(matches[17], 10);
        }
        offset *= matches[14] === "-" ? -1 : 1;
        result -= offset * 60 * 1000;
      }
      return new Date(result);
    }
  }
  // end iso8601.js

  function negativeValues(series) {
    var i, j, data;
    for (i = 0; i < series.length; i++) {
      data = series[i].data;
      for (j = 0; j < data.length; j++) {
        if (data[j][1] < 0) {
          return true;
        }
      }
    }
    return false;
  }

  function jsOptionsFunc(defaultOptions, hideLegend, setMin, setMax, setStacked, setXtitle, setYtitle) {
    return function (chart, opts, chartOptions) {
      var series = chart.data;
      var options = merge({}, defaultOptions);
      options = merge(options, chartOptions || {});

      if (chart.hideLegend) {
        hideLegend(options);
      }

      // min
      if ("min" in opts) {
        setMin(options, opts.min);
      } else if (!negativeValues(series)) {
        setMin(options, 0);
      }

      // max
      if (opts.max) {
        setMax(options, opts.max);
      }

      if ("stacked" in opts) {
        setStacked(options, opts.stacked);
      }

      if (opts.colors) {
        options.colors = opts.colors;
      }

      if (opts.xtitle) {
        setXtitle(options, opts.xtitle);
      }

      if (opts.ytitle) {
        setYtitle(options, opts.ytitle);
      }

      // merge library last
      options = merge(options, opts.library || {});

      return options;
    };
  }

  function setText(element, text) {
    if (document.body.innerText) {
      element.innerText = text;
    } else {
      element.textContent = text;
    }
  }

  function chartError(element, message) {
    setText(element, "Error Loading Chart: " + message);
    element.style.color = "#ff0000";
  }

  function getJSON(element, url, success) {
    ajaxCall(url, success, function (jqXHR, textStatus, errorThrown) {
      var message = (typeof errorThrown === "string") ? errorThrown : errorThrown.message;
      chartError(element, message);
    });
  }

  function ajaxCall(url, success, error) {
    var $ = window.jQuery || window.Zepto || window.$;

    if ($) {
      $.ajax({
        dataType: "json",
        url: url,
        success: success,
        error: error
      });
    } else {
      var xhr = new XMLHttpRequest();
      xhr.open("GET", url, true);
      xhr.setRequestHeader("Content-Type", "application/json");
      xhr.onload = function () {
        if (xhr.status === 200) {
          success(JSON.parse(xhr.responseText), xhr.statusText, xhr);
        } else {
          error(xhr, "error", xhr.statusText);
        }
      };
      xhr.send();
    }
  }

  function errorCatcher(chart, callback) {
    try {
      callback(chart);
    } catch (err) {
      chartError(chart.element, err.message);
      throw err;
    }
  }

  function fetchDataSource(chart, callback, dataSource) {
    if (typeof dataSource === "string") {
      getJSON(chart.element, dataSource, function (data, textStatus, jqXHR) {
        chart.data = data;
        errorCatcher(chart, callback);
      });
    } else {
      chart.data = dataSource;
      errorCatcher(chart, callback);
    }
  }

  function addDownloadButton(chart) {
    var element = chart.element;
    var link = document.createElement("a");
    link.download = chart.options.download === true ? "chart.png" : chart.options.download; // http://caniuse.com/download
    link.style.position = "absolute";
    link.style.top = "20px";
    link.style.right = "20px";
    link.style.zIndex = 1000;
    link.style.lineHeight = "20px";
    link.target = "_blank"; // for safari
    var image = document.createElement("img");
    image.alt = "Download";
    image.style.border = "none";
    // icon from font-awesome
    // http://fa2png.io/
    image.src = "data:image/png;base64,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";
    link.appendChild(image);
    element.style.position = "relative";

    chart.downloadAttached = true;

    // mouseenter
    addEvent(element, "mouseover", function(e) {
      var related = e.relatedTarget;
      // check download option again to ensure it wasn't changed
      if (!related || (related !== this && !childOf(this, related)) && chart.options.download) {
        link.href = chart.toImage();
        element.appendChild(link);
      }
    });

    // mouseleave
    addEvent(element, "mouseout", function(e) {
      var related = e.relatedTarget;
      if (!related || (related !== this && !childOf(this, related))) {
        if (link.parentNode) {
          link.parentNode.removeChild(link);
        }
      }
    });
  }

  // http://stackoverflow.com/questions/10149963/adding-event-listener-cross-browser
  function addEvent(elem, event, fn) {
    if (elem.addEventListener) {
      elem.addEventListener(event, fn, false);
    } else {
      elem.attachEvent("on" + event, function() {
        // set the this pointer same as addEventListener when fn is called
        return(fn.call(elem, window.event));
      });
    }
  }

  // https://gist.github.com/shawnbot/4166283
  function childOf(p, c) {
    if (p === c) return false;
    while (c && c !== p) c = c.parentNode;
    return c === p;
  }

  // type conversions

  function toStr(n) {
    return "" + n;
  }

  function toFloat(n) {
    return parseFloat(n);
  }

  function toDate(n) {
    var matches, year, month, day;
    if (typeof n !== "object") {
      if (typeof n === "number") {
        n = new Date(n * 1000); // ms
      } else if ((matches = n.match(DATE_PATTERN))) {
        year = parseInt(matches[1], 10);
        month = parseInt(matches[3], 10) - 1;
        day = parseInt(matches[5], 10);
        return new Date(year, month, day);
      } else { // str
        // try our best to get the str into iso8601
        // TODO be smarter about this
        var str = n.replace(/ /, "T").replace(" ", "").replace("UTC", "Z");
        n = parseISO8601(str) || new Date(n);
      }
    }
    return n;
  }

  function toArr(n) {
    if (!isArray(n)) {
      var arr = [], i;
      for (i in n) {
        if (n.hasOwnProperty(i)) {
          arr.push([i, n[i]]);
        }
      }
      n = arr;
    }
    return n;
  }

  function sortByTime(a, b) {
    return a[0].getTime() - b[0].getTime();
  }

  function sortByNumber(a, b) {
    return a - b;
  }

  function loadAdapters() {
    if (!HighchartsAdapter && "Highcharts" in window) {
      HighchartsAdapter = new function () {
        var Highcharts = window.Highcharts;

        this.name = "highcharts";

        var defaultOptions = {
          chart: {},
          xAxis: {
            title: {
              text: null
            },
            labels: {
              style: {
                fontSize: "12px"
              }
            }
          },
          yAxis: {
            title: {
              text: null
            },
            labels: {
              style: {
                fontSize: "12px"
              }
            }
          },
          title: {
            text: null
          },
          credits: {
            enabled: false
          },
          legend: {
            borderWidth: 0
          },
          tooltip: {
            style: {
              fontSize: "12px"
            }
          },
          plotOptions: {
            areaspline: {},
            series: {
              marker: {}
            }
          }
        };

        var hideLegend = function (options) {
          options.legend.enabled = false;
        };

        var setMin = function (options, min) {
          options.yAxis.min = min;
        };

        var setMax = function (options, max) {
          options.yAxis.max = max;
        };

        var setStacked = function (options, stacked) {
          options.plotOptions.series.stacking = stacked ? "normal" : null;
        };

        var setXtitle = function (options, title) {
          options.xAxis.title.text = title;
        };

        var setYtitle = function (options, title) {
          options.yAxis.title.text = title;
        };

        var jsOptions = jsOptionsFunc(defaultOptions, hideLegend, setMin, setMax, setStacked, setXtitle, setYtitle);

        this.renderLineChart = function (chart, chartType) {
          chartType = chartType || "spline";
          var chartOptions = {};
          if (chartType === "areaspline") {
            chartOptions = {
              plotOptions: {
                areaspline: {
                  stacking: "normal"
                },
                series: {
                  marker: {
                    enabled: false
                  }
                }
              }
            };
          }
          var options = jsOptions(chart, chart.options, chartOptions), data, i, j;
          options.xAxis.type = chart.discrete ? "category" : "datetime";
          if (!options.chart.type) {
            options.chart.type = chartType;
          }
          options.chart.renderTo = chart.element.id;

          var series = chart.data;
          for (i = 0; i < series.length; i++) {
            data = series[i].data;
            if (!chart.discrete) {
              for (j = 0; j < data.length; j++) {
                data[j][0] = data[j][0].getTime();
              }
            }
            series[i].marker = {symbol: "circle"};
          }
          options.series = series;
          chart.chart = new Highcharts.Chart(options);
        };

        this.renderScatterChart = function (chart) {
          var chartOptions = {};
          var options = jsOptions(chart, chart.options, chartOptions);
          options.chart.type = "scatter";
          options.chart.renderTo = chart.element.id;
          options.series = chart.data;
          chart.chart = new Highcharts.Chart(options);
        };

        this.renderPieChart = function (chart) {
          var chartOptions = {};
          if (chart.options.colors) {
            chartOptions.colors = chart.options.colors;
          }
          if (chart.options.donut) {
            chartOptions.plotOptions = {pie: {innerSize: "50%"}};
          }
          var options = merge(merge(defaultOptions, chartOptions), chart.options.library || {});
          options.chart.renderTo = chart.element.id;
          options.series = [{
            type: "pie",
            name: chart.options.label || "Value",
            data: chart.data
          }];
          chart.chart = new Highcharts.Chart(options);
        };

        this.renderColumnChart = function (chart, chartType) {
          chartType = chartType || "column";
          var series = chart.data;
          var options = jsOptions(chart, chart.options), i, j, s, d, rows = [];
          options.chart.type = chartType;
          options.chart.renderTo = chart.element.id;

          for (i = 0; i < series.length; i++) {
            s = series[i];

            for (j = 0; j < s.data.length; j++) {
              d = s.data[j];
              if (!rows[d[0]]) {
                rows[d[0]] = new Array(series.length);
              }
              rows[d[0]][i] = d[1];
            }
          }

          var categories = [];
          for (i in rows) {
            if (rows.hasOwnProperty(i)) {
              categories.push(i);
            }
          }
          options.xAxis.categories = categories;

          var newSeries = [];
          for (i = 0; i < series.length; i++) {
            d = [];
            for (j = 0; j < categories.length; j++) {
              d.push(rows[categories[j]][i] || 0);
            }

            newSeries.push({
              name: series[i].name,
              data: d
            });
          }
          options.series = newSeries;

          chart.chart = new Highcharts.Chart(options);
        };

        var self = this;

        this.renderBarChart = function (chart) {
          self.renderColumnChart(chart, "bar");
        };

        this.renderAreaChart = function (chart) {
          self.renderLineChart(chart, "areaspline");
        };
      };
      adapters.push(HighchartsAdapter);
    }
    if (!GoogleChartsAdapter && window.google && (window.google.setOnLoadCallback || window.google.charts)) {
      GoogleChartsAdapter = new function () {
        var google = window.google;

        this.name = "google";

        var loaded = {};
        var callbacks = [];

        var runCallbacks = function () {
          var cb, call;
          for (var i = 0; i < callbacks.length; i++) {
            cb = callbacks[i];
            call = google.visualization && ((cb.pack === "corechart" && google.visualization.LineChart) || (cb.pack === "timeline" && google.visualization.Timeline));
            if (call) {
              cb.callback();
              callbacks.splice(i, 1);
              i--;
            }
          }
        };

        var waitForLoaded = function (pack, callback) {
          if (!callback) {
            callback = pack;
            pack = "corechart";
          }

          callbacks.push({pack: pack, callback: callback});

          if (loaded[pack]) {
            runCallbacks();
          } else {
            loaded[pack] = true;

            // https://groups.google.com/forum/#!topic/google-visualization-api/fMKJcyA2yyI
            var loadOptions = {
              packages: [pack],
              callback: runCallbacks
            };
            if (config.language) {
              loadOptions.language = config.language;
            }

            if (window.google.setOnLoadCallback) {
              google.load("visualization", "1", loadOptions);
            } else {
              google.charts.load("current", loadOptions);
            }
          }
        };

        // Set chart options
        var defaultOptions = {
          chartArea: {},
          fontName: "'Lucida Grande', 'Lucida Sans Unicode', Verdana, Arial, Helvetica, sans-serif",
          pointSize: 6,
          legend: {
            textStyle: {
              fontSize: 12,
              color: "#444"
            },
            alignment: "center",
            position: "right"
          },
          curveType: "function",
          hAxis: {
            textStyle: {
              color: "#666",
              fontSize: 12
            },
            titleTextStyle: {},
            gridlines: {
              color: "transparent"
            },
            baselineColor: "#ccc",
            viewWindow: {}
          },
          vAxis: {
            textStyle: {
              color: "#666",
              fontSize: 12
            },
            titleTextStyle: {},
            baselineColor: "#ccc",
            viewWindow: {}
          },
          tooltip: {
            textStyle: {
              color: "#666",
              fontSize: 12
            }
          }
        };

        var hideLegend = function (options) {
          options.legend.position = "none";
        };

        var setMin = function (options, min) {
          options.vAxis.viewWindow.min = min;
        };

        var setMax = function (options, max) {
          options.vAxis.viewWindow.max = max;
        };

        var setBarMin = function (options, min) {
          options.hAxis.viewWindow.min = min;
        };

        var setBarMax = function (options, max) {
          options.hAxis.viewWindow.max = max;
        };

        var setStacked = function (options, stacked) {
          options.isStacked = !!stacked;
        };

        var setXtitle = function (options, title) {
          options.hAxis.title = title;
          options.hAxis.titleTextStyle.italic = false;
        };

        var setYtitle = function (options, title) {
          options.vAxis.title = title;
          options.vAxis.titleTextStyle.italic = false;
        };

        var jsOptions = jsOptionsFunc(defaultOptions, hideLegend, setMin, setMax, setStacked, setXtitle, setYtitle);

        // cant use object as key
        var createDataTable = function (series, columnType) {
          var i, j, s, d, key, rows = [];
          for (i = 0; i < series.length; i++) {
            s = series[i];

            for (j = 0; j < s.data.length; j++) {
              d = s.data[j];
              key = (columnType === "datetime") ? d[0].getTime() : d[0];
              if (!rows[key]) {
                rows[key] = new Array(series.length);
              }
              rows[key][i] = toFloat(d[1]);
            }
          }

          var rows2 = [];
          var day = true;
          var value;
          for (i in rows) {
            if (rows.hasOwnProperty(i)) {
              if (columnType === "datetime") {
                value = new Date(toFloat(i));
                day = day && isDay(value);
              } else if (columnType === "number") {
                value = toFloat(i);
              } else {
                value = i;
              }
              rows2.push([value].concat(rows[i]));
            }
          }
          if (columnType === "datetime") {
            rows2.sort(sortByTime);
          }

          // create datatable
          var data = new google.visualization.DataTable();
          columnType = columnType === "datetime" && day ? "date" : columnType;
          data.addColumn(columnType, "");
          for (i = 0; i < series.length; i++) {
            data.addColumn("number", series[i].name);
          }
          data.addRows(rows2);

          return data;
        };

        var resize = function (callback) {
          if (window.attachEvent) {
            window.attachEvent("onresize", callback);
          } else if (window.addEventListener) {
            window.addEventListener("resize", callback, true);
          }
          callback();
        };

        this.renderLineChart = function (chart) {
          waitForLoaded(function () {
            var options = jsOptions(chart, chart.options);
            var data = createDataTable(chart.data, chart.discrete ? "string" : "datetime");
            chart.chart = new google.visualization.LineChart(chart.element);
            resize(function () {
              chart.chart.draw(data, options);
            });
          });
        };

        this.renderPieChart = function (chart) {
          waitForLoaded(function () {
            var chartOptions = {
              chartArea: {
                top: "10%",
                height: "80%"
              }
            };
            if (chart.options.colors) {
              chartOptions.colors = chart.options.colors;
            }
            if (chart.options.donut) {
              chartOptions.pieHole = 0.5;
            }
            var options = merge(merge(defaultOptions, chartOptions), chart.options.library || {});

            var data = new google.visualization.DataTable();
            data.addColumn("string", "");
            data.addColumn("number", "Value");
            data.addRows(chart.data);

            chart.chart = new google.visualization.PieChart(chart.element);
            resize(function () {
              chart.chart.draw(data, options);
            });
          });
        };

        this.renderColumnChart = function (chart) {
          waitForLoaded(function () {
            var options = jsOptions(chart, chart.options);
            var data = createDataTable(chart.data, "string");
            chart.chart = new google.visualization.ColumnChart(chart.element);
            resize(function () {
              chart.chart.draw(data, options);
            });
          });
        };

        this.renderBarChart = function (chart) {
          waitForLoaded(function () {
            var chartOptions = {
              hAxis: {
                gridlines: {
                  color: "#ccc"
                }
              }
            };
            var options = jsOptionsFunc(defaultOptions, hideLegend, setBarMin, setBarMax, setStacked, setXtitle, setYtitle)(chart, chart.options, chartOptions);
            var data = createDataTable(chart.data, "string");
            chart.chart = new google.visualization.BarChart(chart.element);
            resize(function () {
              chart.chart.draw(data, options);
            });
          });
        };

        this.renderAreaChart = function (chart) {
          waitForLoaded(function () {
            var chartOptions = {
              isStacked: true,
              pointSize: 0,
              areaOpacity: 0.5
            };
            var options = jsOptions(chart, chart.options, chartOptions);
            var data = createDataTable(chart.data, chart.discrete ? "string" : "datetime");
            chart.chart = new google.visualization.AreaChart(chart.element);
            resize(function () {
              chart.chart.draw(data, options);
            });
          });
        };

        this.renderGeoChart = function (chart) {
          waitForLoaded(function () {
            var chartOptions = {
              legend: "none",
              colorAxis: {
                colors: chart.options.colors || ["#f6c7b6", "#ce502d"]
              }
            };
            var options = merge(merge(defaultOptions, chartOptions), chart.options.library || {});

            var data = new google.visualization.DataTable();
            data.addColumn("string", "");
            data.addColumn("number", chart.options.label || "Value");
            data.addRows(chart.data);

            chart.chart = new google.visualization.GeoChart(chart.element);
            resize(function () {
              chart.chart.draw(data, options);
            });
          });
        };

        this.renderScatterChart = function (chart) {
          waitForLoaded(function () {
            var chartOptions = {};
            var options = jsOptions(chart, chart.options, chartOptions);
            var data = createDataTable(chart.data, "number");

            chart.chart = new google.visualization.ScatterChart(chart.element);
            resize(function () {
              chart.chart.draw(data, options);
            });
          });
        };

        this.renderTimeline = function (chart) {
          waitForLoaded("timeline", function () {
            var chartOptions = {
              legend: "none"
            };

            if (chart.options.colors) {
              chartOptions.colors = chart.options.colors;
            }
            var options = merge(merge(defaultOptions, chartOptions), chart.options.library || {});

            var data = new google.visualization.DataTable();
            data.addColumn({type: "string", id: "Name"});
            data.addColumn({type: "date", id: "Start"});
            data.addColumn({type: "date", id: "End"});
            data.addRows(chart.data);

            chart.element.style.lineHeight = "normal";
            chart.chart = new google.visualization.Timeline(chart.element);

            resize(function () {
              chart.chart.draw(data, options);
            });
          });
        };
      };

      adapters.push(GoogleChartsAdapter);
    }
    if (!ChartjsAdapter && "Chart" in window) {
      ChartjsAdapter = new function () {
        var Chart = window.Chart;

        this.name = "chartjs";

        var baseOptions = {
          maintainAspectRatio: false,
          animation: false,
          tooltips: {
            displayColors: false
          }
        };

        var defaultOptions = {
          scales: {
            yAxes: [
              {
                ticks: {
                  maxTicksLimit: 4
                },
                scaleLabel: {
                  fontSize: 16,
                  // fontStyle: "bold",
                  fontColor: "#333"
                }
              }
            ],
            xAxes: [
              {
                gridLines: {
                  drawOnChartArea: false
                },
                scaleLabel: {
                  fontSize: 16,
                  // fontStyle: "bold",
                  fontColor: "#333"
                },
                time: {},
                ticks: {}
              }
            ]
          },
          legend: {}
        };

        // http://there4.io/2012/05/02/google-chart-color-list/
        var defaultColors = [
          "#3366CC", "#DC3912", "#FF9900", "#109618", "#990099", "#3B3EAC", "#0099C6",
          "#DD4477", "#66AA00", "#B82E2E", "#316395", "#994499", "#22AA99", "#AAAA11",
          "#6633CC", "#E67300", "#8B0707", "#329262", "#5574A6", "#3B3EAC"
        ];

        var hideLegend = function (options) {
          options.legend.display = false;
        };

        var setMin = function (options, min) {
          if (min !== null) {
            options.scales.yAxes[0].ticks.min = min;
          }
        };

        var setMax = function (options, max) {
          options.scales.yAxes[0].ticks.max = max;
        };

        var setBarMin = function (options, min) {
          if (min !== null) {
            options.scales.xAxes[0].ticks.min = min;
          }
        };

        var setBarMax = function (options, max) {
          options.scales.xAxes[0].ticks.max = max;
        };

        var setStacked = function (options, stacked) {
          options.scales.xAxes[0].stacked = !!stacked;
          options.scales.yAxes[0].stacked = !!stacked;
        };

        var setXtitle = function (options, title) {
          options.scales.xAxes[0].scaleLabel.display = true;
          options.scales.xAxes[0].scaleLabel.labelString = title;
        };

        var setYtitle = function (options, title) {
          options.scales.yAxes[0].scaleLabel.display = true;
          options.scales.yAxes[0].scaleLabel.labelString = title;
        };

        var drawChart = function(chart, type, data, options) {
          if (chart.chart) {
            chart.chart.destroy();
          } else {
            chart.element.innerHTML = "<canvas></canvas>";
          }

          var ctx = chart.element.getElementsByTagName("CANVAS")[0];
          chart.chart = new Chart(ctx, {
            type: type,
            data: data,
            options: options
          });
        };

        // http://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb
        var addOpacity = function(hex, opacity) {
          var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
          return result ? "rgba(" + parseInt(result[1], 16) + ", " + parseInt(result[2], 16) + ", " + parseInt(result[3], 16) + ", " + opacity + ")" : hex;
        };

        var setLabelSize = function (chart, data, options) {
          var maxLabelSize = Math.ceil(chart.element.offsetWidth / 4.0 / data.labels.length);
          if (maxLabelSize > 25) {
            maxLabelSize = 25;
          }
          options.scales.xAxes[0].ticks.callback = function (value) {
            value = toStr(value);
            if (value.length > maxLabelSize) {
              return value.substring(0, maxLabelSize - 2) + "...";
            } else {
              return value;
            }
          };
        };

        var jsOptions = jsOptionsFunc(merge(baseOptions, defaultOptions), hideLegend, setMin, setMax, setStacked, setXtitle, setYtitle);

        var createDataTable = function (chart, options, chartType) {
          var datasets = [];
          var labels = [];

          var colors = chart.options.colors || defaultColors;

          var day = true;
          var week = true;
          var dayOfWeek;
          var month = true;
          var year = true;
          var hour = true;
          var minute = true;
          var detectType = (chartType === "line" || chartType === "area") && !chart.discrete;

          var series = chart.data;

          var sortedLabels = [];

          var i, j, s, d, key, rows = [];
          for (i = 0; i < series.length; i++) {
            s = series[i];

            for (j = 0; j < s.data.length; j++) {
              d = s.data[j];
              key = detectType ? d[0].getTime() : d[0];
              if (!rows[key]) {
                rows[key] = new Array(series.length);
              }
              rows[key][i] = toFloat(d[1]);
              if (sortedLabels.indexOf(key) === -1) {
                sortedLabels.push(key);
              }
            }
          }

          if (detectType) {
            sortedLabels.sort(sortByNumber);
          }

          var rows2 = [];
          for (j = 0; j < series.length; j++) {
            rows2.push([]);
          }

          var value;
          var k;
          for (k = 0; k < sortedLabels.length; k++) {
            i = sortedLabels[k];
            if (detectType) {
              value = new Date(toFloat(i));
              // TODO make this efficient
              day = day && isDay(value);
              if (!dayOfWeek) {
                dayOfWeek = value.getDay();
              }
              week = week && isWeek(value, dayOfWeek);
              month = month && isMonth(value);
              year = year && isYear(value);
              hour = hour && isHour(value);
              minute = minute && isMinute(value);
            } else {
              value = i;
            }
            labels.push(value);
            for (j = 0; j < series.length; j++) {
              // Chart.js doesn't like undefined
              rows2[j].push(rows[i][j] === undefined ? null : rows[i][j]);
            }
          }

          for (i = 0; i < series.length; i++) {
            s = series[i];

            var backgroundColor = chartType !== "line" ? addOpacity(colors[i], 0.5) : colors[i];

            var dataset = {
              label: s.name,
              data: rows2[i],
              fill: chartType === "area",
              borderColor: colors[i],
              backgroundColor: backgroundColor,
              pointBackgroundColor: colors[i],
              borderWidth: 2
            };

            datasets.push(merge(dataset, s.library || {}));
          }

          if (detectType && labels.length > 0) {
            var minTime = labels[0].getTime();
            var maxTime = labels[0].getTime();
            for (i = 1; i < labels.length; i++) {
              value = labels[i].getTime();
              if (value < minTime) {
                minTime = value;
              }
              if (value > maxTime) {
                maxTime = value;
              }
            }

            var timeDiff = (maxTime - minTime) / (86400 * 1000.0);

            if (!options.scales.xAxes[0].time.unit) {
              var step;
              if (year || timeDiff > 365 * 10) {
                options.scales.xAxes[0].time.unit = "year";
                step = 365;
              } else if (month || timeDiff > 30 * 10) {
                options.scales.xAxes[0].time.unit = "month";
                step = 30;
              } else if (day || timeDiff > 10) {
                options.scales.xAxes[0].time.unit = "day";
                step = 1;
              } else if (hour || timeDiff > 0.5) {
                options.scales.xAxes[0].time.displayFormats = {hour: "MMM D, h a"};
                options.scales.xAxes[0].time.unit = "hour";
                step = 1 / 24.0;
              } else if (minute) {
                options.scales.xAxes[0].time.displayFormats = {minute: "h:mm a"};
                options.scales.xAxes[0].time.unit = "minute";
                step = 1 / 24.0 / 60.0;
              }

              if (step && timeDiff > 0) {
                var unitStepSize = Math.ceil(timeDiff / step / (chart.element.offsetWidth / 100.0));
                if (week && step === 1) {
                  unitStepSize = Math.ceil(unitStepSize / 7.0) * 7;
                }
                options.scales.xAxes[0].time.unitStepSize = unitStepSize;
              }
            }

            if (!options.scales.xAxes[0].time.tooltipFormat) {
              if (day) {
                options.scales.xAxes[0].time.tooltipFormat = "ll";
              } else if (hour) {
                options.scales.xAxes[0].time.tooltipFormat = "MMM D, h a";
              } else if (minute) {
                options.scales.xAxes[0].time.tooltipFormat = "h:mm a";
              }
            }
          }

          var data = {
            labels: labels,
            datasets: datasets
          };

          return data;
        };

        this.renderLineChart = function (chart, chartType) {
          var areaOptions = {};
          if (chartType === "area") {
            // TODO fix area stacked
            // areaOptions.stacked = true;
          }
          // fix for https://github.com/chartjs/Chart.js/issues/2441
          if (!chart.options.max && allZeros(chart.data)) {
            chart.options.max = 1;
          }

          var options = jsOptions(chart, merge(areaOptions, chart.options));

          var data = createDataTable(chart, options, chartType || "line");

          options.scales.xAxes[0].type = chart.discrete ? "category" : "time";

          drawChart(chart, "line", data, options);
        };

        this.renderPieChart = function (chart) {
          var options = merge({}, baseOptions);
          if (chart.options.donut) {
            options.cutoutPercentage = 50;
          }
          options = merge(options, chart.options.library || {});

          var labels = [];
          var values = [];
          for (var i = 0; i < chart.data.length; i++) {
            var point = chart.data[i];
            labels.push(point[0]);
            values.push(point[1]);
          }

          var data = {
            labels: labels,
            datasets: [
              {
                data: values,
                backgroundColor: chart.options.colors || defaultColors
              }
            ]
          };

          drawChart(chart, "pie", data, options);
        };

        this.renderColumnChart = function (chart, chartType) {
          var options;
          if (chartType === "bar") {
            options = jsOptionsFunc(merge(baseOptions, defaultOptions), hideLegend, setBarMin, setBarMax, setStacked, setXtitle, setYtitle)(chart, chart.options);
          } else {
            options = jsOptions(chart, chart.options);
          }
          var data = createDataTable(chart, options, "column");
          setLabelSize(chart, data, options);
          drawChart(chart, (chartType === "bar" ? "horizontalBar" : "bar"), data, options);
        };

        var self = this;

        this.renderAreaChart = function (chart) {
          self.renderLineChart(chart, "area");
        };

        this.renderBarChart = function (chart) {
          self.renderColumnChart(chart, "bar");
        };

        this.renderScatterChart = function (chart) {
          var options = jsOptions(chart, chart.options);

          var colors = chart.options.colors || defaultColors;

          var datasets = [];
          var series = chart.data;
          for (var i = 0; i < series.length; i++) {
            var s = series[i];
            var d = [];
            for (var j = 0; j < s.data.length; j++) {
              d.push({
                x: toFloat(s.data[j][0]),
                y: toFloat(s.data[j][1])
              });
            }

            datasets.push({
              label: s.name,
              showLine: false,
              data: d,
              borderColor: colors[i],
              backgroundColor: colors[i],
              pointBackgroundColor: colors[i]
            })
          }

          var data = {datasets: datasets};

          options.scales.xAxes[0].type = "linear";
          options.scales.xAxes[0].position = "bottom";

          drawChart(chart, "line", data, options);
        };
      };

      adapters.unshift(ChartjsAdapter);
    }
  }

  function renderChart(chartType, chart) {
    callAdapter(chartType, chart);
    if (chart.options.download && !chart.downloadAttached && chart.adapter === "chartjs") {
      addDownloadButton(chart);
    }
  }

  // TODO remove chartType if cross-browser way
  // to get the name of the chart class
  function callAdapter(chartType, chart) {
    var i, adapter, fnName, adapterName;
    fnName = "render" + chartType;
    adapterName = chart.options.adapter;

    loadAdapters();

    for (i = 0; i < adapters.length; i++) {
      adapter = adapters[i];
      if ((!adapterName || adapterName === adapter.name) && isFunction(adapter[fnName])) {
        chart.adapter = adapter.name;
        return adapter[fnName](chart);
      }
    }
    throw new Error("No adapter found");
  }

  // process data

  var toFormattedKey = function (key, keyType) {
    if (keyType === "number") {
      key = toFloat(key);
    } else if (keyType === "datetime") {
      key = toDate(key);
    } else {
      key = toStr(key);
    }
    return key;
  };

  var formatSeriesData = function (data, keyType) {
    var r = [], key, j;
    for (j = 0; j < data.length; j++) {
      key = toFormattedKey(data[j][0], keyType);
      r.push([key, toFloat(data[j][1])]);
    }
    if (keyType === "datetime") {
      r.sort(sortByTime);
    }
    return r;
  };

  function isMinute(d) {
    return d.getMilliseconds() === 0 && d.getSeconds() === 0;
  }

  function isHour(d) {
    return isMinute(d) && d.getMinutes() === 0;
  }

  function isDay(d) {
    return isHour(d) && d.getHours() === 0;
  }

  function isWeek(d, dayOfWeek) {
    return isDay(d) && d.getDay() === dayOfWeek;
  }

  function isMonth(d) {
    return isDay(d) && d.getDate() === 1;
  }

  function isYear(d) {
    return isMonth(d) && d.getMonth() === 0;
  }

  function isDate(obj) {
    return !isNaN(toDate(obj)) && toStr(obj).length >= 6;
  }

  function allZeros(data) {
    var i, j, d;
    for (i = 0; i < data.length; i++) {
      d = data[i].data;
      for (j = 0; j < d.length; j++) {
        if (d[j][1] != 0) {
          return false;
        }
      }
    }
    return true;
  }

  function detectDiscrete(series) {
    var i, j, data;
    for (i = 0; i < series.length; i++) {
      data = toArr(series[i].data);
      for (j = 0; j < data.length; j++) {
        if (!isDate(data[j][0])) {
          return true;
        }
      }
    }
    return false;
  }

  function processSeries(chart, keyType) {
    var i;

    var opts = chart.options;
    var series = chart.data;

    // see if one series or multiple
    if (!isArray(series) || typeof series[0] !== "object" || isArray(series[0])) {
      series = [{name: opts.label || "Value", data: series}];
      chart.hideLegend = true;
    } else {
      chart.hideLegend = false;
    }
    if ((opts.discrete === null || opts.discrete === undefined)) {
      chart.discrete = detectDiscrete(series);
    } else {
      chart.discrete = opts.discrete;
    }
    if (chart.discrete) {
      keyType = "string";
    }

    // right format
    for (i = 0; i < series.length; i++) {
      series[i].data = formatSeriesData(toArr(series[i].data), keyType);
    }

    return series;
  }

  function processSimple(data) {
    var perfectData = toArr(data), i;
    for (i = 0; i < perfectData.length; i++) {
      perfectData[i] = [toStr(perfectData[i][0]), toFloat(perfectData[i][1])];
    }
    return perfectData;
  }

  function processTime(data)
  {
    var i;
    for (i = 0; i < data.length; i++) {
      data[i][1] = toDate(data[i][1]);
      data[i][2] = toDate(data[i][2]);
    }
    return data;
  }

  function processLineData(chart) {
    chart.data = processSeries(chart, "datetime");
    renderChart("LineChart", chart);
  }

  function processColumnData(chart) {
    chart.data = processSeries(chart, "string");
    renderChart("ColumnChart", chart);
  }

  function processPieData(chart) {
    chart.data = processSimple(chart.data);
    renderChart("PieChart", chart);
  }

  function processBarData(chart) {
    chart.data = processSeries(chart, "string");
    renderChart("BarChart", chart);
  }

  function processAreaData(chart) {
    chart.data = processSeries(chart, "datetime");
    renderChart("AreaChart", chart);
  }

  function processGeoData(chart) {
    chart.data = processSimple(chart.data);
    renderChart("GeoChart", chart);
  }

  function processScatterData(chart) {
    chart.data = processSeries(chart, "number");
    renderChart("ScatterChart", chart);
  }

  function processTimelineData(chart) {
    chart.data = processTime(chart.data);
    renderChart("Timeline", chart);
  }

  function setElement(chart, element, dataSource, opts, callback) {
    var elementId;
    if (typeof element === "string") {
      elementId = element;
      element = document.getElementById(element);
      if (!element) {
        throw new Error("No element with id " + elementId);
      }
    }

    chart.element = element;
    opts = merge(Chartkick.options, opts || {});
    chart.options = opts;
    chart.dataSource = dataSource;

    // getters
    chart.getElement = function () {
      return element;
    };
    chart.getDataSource = function () {
      return chart.dataSource;
    };
    chart.getData = function () {
      return chart.data;
    };
    chart.getOptions = function () {
      return chart.options;
    };
    chart.getChartObject = function () {
      return chart.chart;
    };

    // functions
    chart.updateData = function (dataSource, options) {
      chart.dataSource = dataSource;
      if (options) {
        chart.options = merge(Chartkick.options, options);
      }
      fetchDataSource(chart, callback, dataSource);
    };
    chart.refreshData = function () {
      if (typeof dataSource === "string") {
        // prevent browser from caching
        var sep = dataSource.indexOf("?") === -1 ? "?" : "&";
        var url = dataSource + sep + "_=" + (new Date()).getTime();
        fetchDataSource(chart, callback, url);
      }
    };
    chart.stopRefresh = function () {
      if (chart.intervalId) {
        clearInterval(chart.intervalId);
      }
    };
    chart.toImage = function () {
      if (chart.adapter === "chartjs") {
        return chart.chart.toBase64Image();
      } else {
        return null;
      }
    }

    Chartkick.charts[element.id] = chart;

    fetchDataSource(chart, callback, dataSource);

    if (opts.refresh) {
      chart.intervalId = setInterval( function () {
        chart.refreshData();
      }, opts.refresh * 1000);
    }
  }

  // define classes

  Chartkick = {
    LineChart: function (element, dataSource, opts) {
      setElement(this, element, dataSource, opts, processLineData);
    },
    PieChart: function (element, dataSource, opts) {
      setElement(this, element, dataSource, opts, processPieData);
    },
    ColumnChart: function (element, dataSource, opts) {
      setElement(this, element, dataSource, opts, processColumnData);
    },
    BarChart: function (element, dataSource, opts) {
      setElement(this, element, dataSource, opts, processBarData);
    },
    AreaChart: function (element, dataSource, opts) {
      setElement(this, element, dataSource, opts, processAreaData);
    },
    GeoChart: function (element, dataSource, opts) {
      setElement(this, element, dataSource, opts, processGeoData);
    },
    ScatterChart: function (element, dataSource, opts) {
      setElement(this, element, dataSource, opts, processScatterData);
    },
    Timeline: function (element, dataSource, opts) {
      setElement(this, element, dataSource, opts, processTimelineData);
    },
    charts: {},
    configure: function (options) {
      for (var key in options) {
        if (options.hasOwnProperty(key)) {
          config[key] = options[key];
        }
      }
    },
    eachChart: function (callback) {
      for (var chartId in Chartkick.charts) {
        if (Chartkick.charts.hasOwnProperty(chartId)) {
          callback(Chartkick.charts[chartId]);
        }
      }
    },
    options: {}
  };

  if (typeof module === "object" && typeof module.exports === "object") {
    module.exports = Chartkick;
  } else {
    window.Chartkick = Chartkick;
  }
}(window));