/* *
 *
 *  (c) 2010-2019 Torstein Honsi
 *
 *  License: www.highcharts.com/license
 *
 *  !!!!!!! SOURCE GETS TRANSPILED BY TYPESCRIPT. EDIT TS FILE ONLY. !!!!!!!
 *
 * */
'use strict';
import H from './Globals.js';
/**
 * @typedef {"average"|"averages"|"open"|"high"|"low"|"close"|"sum"} Highcharts.DataGroupingApproximationValue
 */
/**
 * @interface Highcharts.DataGroupingInfoObject
 */ /**
* @name Highcharts.DataGroupingInfoObject#length
* @type {number}
*/ /**
* @name Highcharts.DataGroupingInfoObject#options
* @type {Highcharts.SeriesOptionsType|undefined}
*/ /**
* @name Highcharts.DataGroupingInfoObject#start
* @type {number}
*/
import U from './Utilities.js';
var defined = U.defined, isNumber = U.isNumber;
import './Axis.js';
import './Series.js';
import './Tooltip.js';
var addEvent = H.addEvent, arrayMax = H.arrayMax, arrayMin = H.arrayMin, Axis = H.Axis, correctFloat = H.correctFloat, defaultPlotOptions = H.defaultPlotOptions, extend = H.extend, format = H.format, merge = H.merge, pick = H.pick, Point = H.Point, Series = H.Series, Tooltip = H.Tooltip;
/* ************************************************************************** *
 *  Start data grouping module                                                *
 * ************************************************************************** */
/* eslint-disable no-invalid-this, valid-jsdoc */
/**
 * Define the available approximation types. The data grouping
 * approximations takes an array or numbers as the first parameter. In case
 * of ohlc, four arrays are sent in as four parameters. Each array consists
 * only of numbers. In case null values belong to the group, the property
 * .hasNulls will be set to true on the array.
 *
 * @product highstock
 *
 * @private
 * @name Highcharts.approximations
 * @type {Highcharts.Dictionary<Function>}
 */
var approximations = H.approximations = {
    sum: function (arr) {
        var len = arr.length, ret;
        // 1. it consists of nulls exclusive
        if (!len && arr.hasNulls) {
            ret = null;
            // 2. it has a length and real values
        }
        else if (len) {
            ret = 0;
            while (len--) {
                ret += arr[len];
            }
        }
        // 3. it has zero length, so just return undefined
        // => doNothing()
        return ret;
    },
    average: function (arr) {
        var len = arr.length, ret = approximations.sum(arr);
        // If we have a number, return it divided by the length. If not,
        // return null or undefined based on what the sum method finds.
        if (isNumber(ret) && len) {
            ret = correctFloat(ret / len);
        }
        return ret;
    },
    // The same as average, but for series with multiple values, like area
    // ranges.
    averages: function () {
        var ret = [];
        [].forEach.call(arguments, function (arr) {
            ret.push(approximations.average(arr));
        });
        // Return undefined when first elem. is undefined and let
        // sum method handle null (#7377)
        return ret[0] === undefined ? undefined : ret;
    },
    open: function (arr) {
        return arr.length ? arr[0] : (arr.hasNulls ? null : undefined);
    },
    high: function (arr) {
        return arr.length ?
            arrayMax(arr) :
            (arr.hasNulls ? null : undefined);
    },
    low: function (arr) {
        return arr.length ?
            arrayMin(arr) :
            (arr.hasNulls ? null : undefined);
    },
    close: function (arr) {
        return arr.length ?
            arr[arr.length - 1] :
            (arr.hasNulls ? null : undefined);
    },
    // ohlc and range are special cases where a multidimensional array is
    // input and an array is output
    ohlc: function (open, high, low, close) {
        open = approximations.open(open);
        high = approximations.high(high);
        low = approximations.low(low);
        close = approximations.close(close);
        if (isNumber(open) ||
            isNumber(high) ||
            isNumber(low) ||
            isNumber(close)) {
            return [open, high, low, close];
        }
        // else, return is undefined
    },
    range: function (low, high) {
        low = approximations.low(low);
        high = approximations.high(high);
        if (isNumber(low) || isNumber(high)) {
            return [low, high];
        }
        if (low === null && high === null) {
            return null;
        }
        // else, return is undefined
    }
};
var groupData = function (xData, yData, groupPositions, approximation) {
    var series = this, data = series.data, dataOptions = series.options && series.options.data, groupedXData = [], groupedYData = [], groupMap = [], dataLength = xData.length, pointX, pointY, groupedY, 
    // when grouping the fake extended axis for panning,
    // we don't need to consider y
    handleYData = !!yData, values = [], approximationFn, pointArrayMap = series.pointArrayMap, pointArrayMapLength = pointArrayMap && pointArrayMap.length, extendedPointArrayMap = ['x'].concat(pointArrayMap || ['y']), pos = 0, start = 0, valuesLen, i, j;
    /**
     * @private
     */
    function getApproximation(approx) {
        if (typeof approx === 'function') {
            return approx;
        }
        if (approximations[approx]) {
            return approximations[approx];
        }
        return approximations[(series.getDGApproximation && series.getDGApproximation()) ||
            'average'];
    }
    approximationFn = getApproximation(approximation);
    // Calculate values array size from pointArrayMap length
    if (pointArrayMapLength) {
        pointArrayMap.forEach(function () {
            values.push([]);
        });
    }
    else {
        values.push([]);
    }
    valuesLen = pointArrayMapLength || 1;
    // Start with the first point within the X axis range (#2696)
    for (i = 0; i <= dataLength; i++) {
        if (xData[i] >= groupPositions[0]) {
            break;
        }
    }
    for (i; i <= dataLength; i++) {
        // when a new group is entered, summarize and initialize
        // the previous group
        while ((groupPositions[pos + 1] !== undefined &&
            xData[i] >= groupPositions[pos + 1]) ||
            i === dataLength) { // get the last group
            // get group x and y
            pointX = groupPositions[pos];
            series.dataGroupInfo = {
                start: series.cropStart + start,
                length: values[0].length
            };
            groupedY = approximationFn.apply(series, values);
            // By default, let options of the first grouped point be passed over
            // to the grouped point. This allows preserving properties like
            // `name` and `color` or custom properties. Implementers can
            // override this from the approximation function, where they can
            // write custom options to `this.dataGroupInfo.options`.
            if (series.pointClass && !defined(series.dataGroupInfo.options)) {
                // Convert numbers and arrays into objects
                series.dataGroupInfo.options = merge(series.pointClass.prototype
                    .optionsToObject.call({ series: series }, series.options.data[series.cropStart + start]));
                // Make sure the raw data (x, y, open, high etc) is not copied
                // over and overwriting approximated data.
                extendedPointArrayMap.forEach(function (key) {
                    delete series.dataGroupInfo.options[key];
                });
            }
            // push the grouped data
            if (groupedY !== undefined) {
                groupedXData.push(pointX);
                groupedYData.push(groupedY);
                groupMap.push(series.dataGroupInfo);
            }
            // reset the aggregate arrays
            start = i;
            for (j = 0; j < valuesLen; j++) {
                values[j].length = 0; // faster than values[j] = []
                values[j].hasNulls = false;
            }
            // Advance on the group positions
            pos += 1;
            // don't loop beyond the last group
            if (i === dataLength) {
                break;
            }
        }
        // break out
        if (i === dataLength) {
            break;
        }
        // for each raw data point, push it to an array that contains all values
        // for this specific group
        if (pointArrayMap) {
            var index = series.cropStart + i, point = (data && data[index]) ||
                series.pointClass.prototype.applyOptions.apply({
                    series: series
                }, [dataOptions[index]]), val;
            for (j = 0; j < pointArrayMapLength; j++) {
                val = point[pointArrayMap[j]];
                if (isNumber(val)) {
                    values[j].push(val);
                }
                else if (val === null) {
                    values[j].hasNulls = true;
                }
            }
        }
        else {
            pointY = handleYData ? yData[i] : null;
            if (isNumber(pointY)) {
                values[0].push(pointY);
            }
            else if (pointY === null) {
                values[0].hasNulls = true;
            }
        }
    }
    return {
        groupedXData: groupedXData,
        groupedYData: groupedYData,
        groupMap: groupMap
    };
};
var dataGrouping = {
    approximations: approximations,
    groupData: groupData
};
// -----------------------------------------------------------------------------
// The following code applies to implementation of data grouping on a Series
var seriesProto = Series.prototype, baseProcessData = seriesProto.processData, baseGeneratePoints = seriesProto.generatePoints, 
/**
 * @ignore
 */
commonOptions = {
    // enabled: null, // (true for stock charts, false for basic),
    // forced: undefined,
    groupPixelWidth: 2,
    // the first one is the point or start value, the second is the start
    // value if we're dealing with range, the third one is the end value if
    // dealing with a range
    dateTimeLabelFormats: {
        millisecond: [
            '%A, %b %e, %H:%M:%S.%L',
            '%A, %b %e, %H:%M:%S.%L',
            '-%H:%M:%S.%L'
        ],
        second: [
            '%A, %b %e, %H:%M:%S',
            '%A, %b %e, %H:%M:%S',
            '-%H:%M:%S'
        ],
        minute: [
            '%A, %b %e, %H:%M',
            '%A, %b %e, %H:%M',
            '-%H:%M'
        ],
        hour: [
            '%A, %b %e, %H:%M',
            '%A, %b %e, %H:%M',
            '-%H:%M'
        ],
        day: [
            '%A, %b %e, %Y',
            '%A, %b %e',
            '-%A, %b %e, %Y'
        ],
        week: [
            'Week from %A, %b %e, %Y',
            '%A, %b %e',
            '-%A, %b %e, %Y'
        ],
        month: [
            '%B %Y',
            '%B',
            '-%B %Y'
        ],
        year: [
            '%Y',
            '%Y',
            '-%Y'
        ]
    }
    // smoothed = false, // enable this for navigator series only
}, specificOptions = {
    line: {},
    spline: {},
    area: {},
    areaspline: {},
    column: {
        groupPixelWidth: 10
    },
    columnrange: {
        groupPixelWidth: 10
    },
    candlestick: {
        groupPixelWidth: 10
    },
    ohlc: {
        groupPixelWidth: 5
    }
}, 
// units are defined in a separate array to allow complete overriding in
// case of a user option
defaultDataGroupingUnits = H.defaultDataGroupingUnits = [
    [
        'millisecond',
        [1, 2, 5, 10, 20, 25, 50, 100, 200, 500] // allowed multiples
    ], [
        'second',
        [1, 2, 5, 10, 15, 30]
    ], [
        'minute',
        [1, 2, 5, 10, 15, 30]
    ], [
        'hour',
        [1, 2, 3, 4, 6, 8, 12]
    ], [
        'day',
        [1]
    ], [
        'week',
        [1]
    ], [
        'month',
        [1, 3, 6]
    ], [
        'year',
        null
    ]
];
// Set default approximations to the prototypes if present. Properties are
// inherited down. Can be overridden for individual series types.
seriesProto.getDGApproximation = function () {
    if (H.seriesTypes.arearange && this instanceof H.seriesTypes.arearange) {
        return 'range';
    }
    if (H.seriesTypes.ohlc && this instanceof H.seriesTypes.ohlc) {
        return 'ohlc';
    }
    if (H.seriesTypes.column && this instanceof H.seriesTypes.column) {
        return 'sum';
    }
    return 'average';
};
/**
 * Takes parallel arrays of x and y data and groups the data into intervals
 * defined by groupPositions, a collection of starting x values for each group.
 *
 * @private
 * @function Highcharts.Series#groupData
 *
 * @param {Array<number>} xData
 *
 * @param {Array<number>} yData
 *
 * @param {boolean} groupPositions
 *
 * @param {string|Function} approximation
 *
 * @return {void}
 */
seriesProto.groupData = groupData;
// Extend the basic processData method, that crops the data to the current zoom
// range, with data grouping logic.
seriesProto.processData = function () {
    var series = this, chart = series.chart, options = series.options, dataGroupingOptions = options.dataGrouping, groupingEnabled = series.allowDG !== false && dataGroupingOptions &&
        pick(dataGroupingOptions.enabled, chart.options.isStock), visible = (series.visible || !chart.options.chart.ignoreHiddenSeries), hasGroupedData, skip, lastDataGrouping = this.currentDataGrouping, currentDataGrouping, croppedData, revertRequireSorting = false;
    // Run base method
    series.forceCrop = groupingEnabled; // #334
    series.groupPixelWidth = null; // #2110
    series.hasProcessed = true; // #2692
    // Data needs to be sorted for dataGrouping
    if (groupingEnabled && !series.requireSorting) {
        series.requireSorting = revertRequireSorting = true;
    }
    // Skip if processData returns false or if grouping is disabled (in that
    // order)
    skip = (baseProcessData.apply(series, arguments) === false ||
        !groupingEnabled);
    // Revert original requireSorting value if changed
    if (revertRequireSorting) {
        series.requireSorting = false;
    }
    if (!skip) {
        series.destroyGroupedData();
        var i, processedXData = dataGroupingOptions.groupAll ?
            series.xData :
            series.processedXData, processedYData = dataGroupingOptions.groupAll ?
            series.yData :
            series.processedYData, plotSizeX = chart.plotSizeX, xAxis = series.xAxis, ordinal = xAxis.options.ordinal, groupPixelWidth = series.groupPixelWidth =
            xAxis.getGroupPixelWidth && xAxis.getGroupPixelWidth();
        // Execute grouping if the amount of points is greater than the limit
        // defined in groupPixelWidth
        if (groupPixelWidth) {
            hasGroupedData = true;
            // Force recreation of point instances in series.translate, #5699
            series.isDirty = true;
            series.points = null; // #6709
            var extremes = xAxis.getExtremes(), xMin = extremes.min, xMax = extremes.max, groupIntervalFactor = (ordinal &&
                xAxis.getGroupIntervalFactor(xMin, xMax, series)) || 1, interval = (groupPixelWidth * (xMax - xMin) / plotSizeX) *
                groupIntervalFactor, groupPositions = xAxis.getTimeTicks(xAxis.normalizeTimeTickInterval(interval, dataGroupingOptions.units ||
                defaultDataGroupingUnits), 
            // Processed data may extend beyond axis (#4907)
            Math.min(xMin, processedXData[0]), Math.max(xMax, processedXData[processedXData.length - 1]), xAxis.options.startOfWeek, processedXData, series.closestPointRange), groupedData = seriesProto.groupData.apply(series, [
                processedXData,
                processedYData,
                groupPositions,
                dataGroupingOptions.approximation
            ]), groupedXData = groupedData.groupedXData, groupedYData = groupedData.groupedYData, gapSize = 0;
            // Prevent the smoothed data to spill out left and right, and make
            // sure data is not shifted to the left
            if (dataGroupingOptions.smoothed && groupedXData.length) {
                i = groupedXData.length - 1;
                groupedXData[i] = Math.min(groupedXData[i], xMax);
                while (i-- && i > 0) {
                    groupedXData[i] += interval / 2;
                }
                groupedXData[0] = Math.max(groupedXData[0], xMin);
            }
            // Record what data grouping values were used
            for (i = 1; i < groupPositions.length; i++) {
                // The grouped gapSize needs to be the largest distance between
                // the group to capture varying group sizes like months or DST
                // crossing (#10000). Also check that the gap is not at the
                // start of a segment.
                if (!groupPositions.info.segmentStarts ||
                    groupPositions.info.segmentStarts.indexOf(i) === -1) {
                    gapSize = Math.max(groupPositions[i] - groupPositions[i - 1], gapSize);
                }
            }
            currentDataGrouping = groupPositions.info;
            currentDataGrouping.gapSize = gapSize;
            series.closestPointRange = groupPositions.info.totalRange;
            series.groupMap = groupedData.groupMap;
            // Make sure the X axis extends to show the first group (#2533)
            // But only for visible series (#5493, #6393)
            if (defined(groupedXData[0]) &&
                groupedXData[0] < xAxis.min &&
                visible) {
                if ((!defined(xAxis.options.min) &&
                    xAxis.min <= xAxis.dataMin) ||
                    xAxis.min === xAxis.dataMin) {
                    xAxis.min = groupedXData[0];
                }
                xAxis.dataMin = groupedXData[0];
            }
            // We calculated all group positions but we should render
            // only the ones within the visible range
            if (dataGroupingOptions.groupAll) {
                croppedData = series.cropData(groupedXData, groupedYData, xAxis.min, xAxis.max, 1 // Ordinal xAxis will remove left-most points otherwise
                );
                groupedXData = croppedData.xData;
                groupedYData = croppedData.yData;
            }
            // Set series props
            series.processedXData = groupedXData;
            series.processedYData = groupedYData;
        }
        else {
            series.groupMap = null;
        }
        series.hasGroupedData = hasGroupedData;
        series.currentDataGrouping = currentDataGrouping;
        series.preventGraphAnimation =
            (lastDataGrouping && lastDataGrouping.totalRange) !==
                (currentDataGrouping && currentDataGrouping.totalRange);
    }
};
// Destroy the grouped data points. #622, #740
seriesProto.destroyGroupedData = function () {
    var groupedData = this.groupedData;
    // clear previous groups
    (groupedData || []).forEach(function (point, i) {
        if (point) {
            groupedData[i] = point.destroy ? point.destroy() : null;
        }
    });
    this.groupedData = null;
};
// Override the generatePoints method by adding a reference to grouped data
seriesProto.generatePoints = function () {
    baseGeneratePoints.apply(this);
    // Record grouped data in order to let it be destroyed the next time
    // processData runs
    this.destroyGroupedData(); // #622
    this.groupedData = this.hasGroupedData ? this.points : null;
};
// Override point prototype to throw a warning when trying to update grouped
// points.
addEvent(Point, 'update', function () {
    if (this.dataGroup) {
        H.error(24, false, this.series.chart);
        return false;
    }
});
// Extend the original method, make the tooltip's header reflect the grouped
// range.
addEvent(Tooltip, 'headerFormatter', function (e) {
    var tooltip = this, time = this.chart.time, labelConfig = e.labelConfig, series = labelConfig.series, options = series.options, tooltipOptions = series.tooltipOptions, dataGroupingOptions = options.dataGrouping, xDateFormat = tooltipOptions.xDateFormat, xDateFormatEnd, xAxis = series.xAxis, currentDataGrouping, dateTimeLabelFormats, labelFormats, formattedKey, formatString = tooltipOptions[(e.isFooter ? 'footer' : 'header') + 'Format'];
    // apply only to grouped series
    if (xAxis &&
        xAxis.options.type === 'datetime' &&
        dataGroupingOptions &&
        isNumber(labelConfig.key)) {
        // set variables
        currentDataGrouping = series.currentDataGrouping;
        dateTimeLabelFormats = dataGroupingOptions.dateTimeLabelFormats ||
            // Fallback to commonOptions (#9693)
            commonOptions.dateTimeLabelFormats;
        // if we have grouped data, use the grouping information to get the
        // right format
        if (currentDataGrouping) {
            labelFormats =
                dateTimeLabelFormats[currentDataGrouping.unitName];
            if (currentDataGrouping.count === 1) {
                xDateFormat = labelFormats[0];
            }
            else {
                xDateFormat = labelFormats[1];
                xDateFormatEnd = labelFormats[2];
            }
            // if not grouped, and we don't have set the xDateFormat option, get the
            // best fit, so if the least distance between points is one minute, show
            // it, but if the least distance is one day, skip hours and minutes etc.
        }
        else if (!xDateFormat && dateTimeLabelFormats) {
            xDateFormat = tooltip.getXDateFormat(labelConfig, tooltipOptions, xAxis);
        }
        // now format the key
        formattedKey = time.dateFormat(xDateFormat, labelConfig.key);
        if (xDateFormatEnd) {
            formattedKey += time.dateFormat(xDateFormatEnd, labelConfig.key + currentDataGrouping.totalRange - 1);
        }
        // Replace default header style with class name
        if (series.chart.styledMode) {
            formatString = this.styledModeFormat(formatString);
        }
        // return the replaced format
        e.text = format(formatString, {
            point: extend(labelConfig.point, { key: formattedKey }),
            series: series
        }, time);
        e.preventDefault();
    }
});
// Destroy grouped data on series destroy
addEvent(Series, 'destroy', seriesProto.destroyGroupedData);
// Handle default options for data grouping. This must be set at runtime because
// some series types are defined after this.
addEvent(Series, 'afterSetOptions', function (e) {
    var options = e.options, type = this.type, plotOptions = this.chart.options.plotOptions, defaultOptions = defaultPlotOptions[type].dataGrouping, 
    // External series, for example technical indicators should also
    // inherit commonOptions which are not available outside this module
    baseOptions = this.useCommonDataGrouping && commonOptions;
    if (specificOptions[type] || baseOptions) { // #1284
        if (!defaultOptions) {
            defaultOptions = merge(commonOptions, specificOptions[type]);
        }
        options.dataGrouping = merge(baseOptions, defaultOptions, plotOptions.series && plotOptions.series.dataGrouping, // #1228
        plotOptions[type].dataGrouping, // Set by the StockChart constructor
        this.userOptions.dataGrouping);
    }
});
// When resetting the scale reset the hasProccessed flag to avoid taking
// previous data grouping of neighbour series into accound when determining
// group pixel width (#2692).
addEvent(Axis, 'afterSetScale', function () {
    this.series.forEach(function (series) {
        series.hasProcessed = false;
    });
});
// Get the data grouping pixel width based on the greatest defined individual
// width of the axis' series, and if whether one of the axes need grouping.
Axis.prototype.getGroupPixelWidth = function () {
    var series = this.series, len = series.length, i, groupPixelWidth = 0, doGrouping = false, dataLength, dgOptions;
    // If multiple series are compared on the same x axis, give them the same
    // group pixel width (#334)
    i = len;
    while (i--) {
        dgOptions = series[i].options.dataGrouping;
        if (dgOptions) {
            groupPixelWidth = Math.max(groupPixelWidth, 
            // Fallback to commonOptions (#9693)
            pick(dgOptions.groupPixelWidth, commonOptions.groupPixelWidth));
        }
    }
    // If one of the series needs grouping, apply it to all (#1634)
    i = len;
    while (i--) {
        dgOptions = series[i].options.dataGrouping;
        if (dgOptions && series[i].hasProcessed) { // #2692
            dataLength = (series[i].processedXData || series[i].data).length;
            // Execute grouping if the amount of points is greater than the
            // limit defined in groupPixelWidth
            if (series[i].groupPixelWidth ||
                dataLength >
                    (this.chart.plotSizeX / groupPixelWidth) ||
                (dataLength && dgOptions.forced)) {
                doGrouping = true;
            }
        }
    }
    return doGrouping ? groupPixelWidth : 0;
};
/**
 * Highstock only. Force data grouping on all the axis' series.
 *
 * @product highstock
 *
 * @function Highcharts.Axis#setDataGrouping
 *
 * @param {boolean|Highcharts.PlotSeriesDataGroupingOptions} [dataGrouping]
 *        A `dataGrouping` configuration. Use `false` to disable data grouping
 *        dynamically.
 *
 * @param {boolean} [redraw=true]
 *        Whether to redraw the chart or wait for a later call to
 *        {@link Chart#redraw}.
 *
 * @return {void}
 */
Axis.prototype.setDataGrouping = function (dataGrouping, redraw) {
    var i;
    redraw = pick(redraw, true);
    if (!dataGrouping) {
        dataGrouping = {
            forced: false,
            units: null
        };
    }
    // Axis is instantiated, update all series
    if (this instanceof Axis) {
        i = this.series.length;
        while (i--) {
            this.series[i].update({
                dataGrouping: dataGrouping
            }, false);
        }
        // Axis not yet instanciated, alter series options
    }
    else {
        this.chart.options.series.forEach(function (seriesOptions) {
            seriesOptions.dataGrouping = dataGrouping;
        }, false);
    }
    // Clear ordinal slope, so we won't accidentaly use the old one (#7827)
    this.ordinalSlope = null;
    if (redraw) {
        this.chart.redraw();
    }
};
H.dataGrouping = dataGrouping;
export default dataGrouping;
/* eslint-enable no-invalid-this, valid-jsdoc */
/**
 * Data grouping is the concept of sampling the data values into larger
 * blocks in order to ease readability and increase performance of the
 * JavaScript charts. Highstock by default applies data grouping when
 * the points become closer than a certain pixel value, determined by
 * the `groupPixelWidth` option.
 *
 * If data grouping is applied, the grouping information of grouped
 * points can be read from the [Point.dataGroup](
 * /class-reference/Highcharts.Point#dataGroup). If point options other than
 * the data itself are set, for example `name` or `color` or custom properties,
 * the grouping logic doesn't know how to group it. In this case the options of
 * the first point instance are copied over to the group point. This can be
 * altered through a custom `approximation` callback function.
 *
 * @product   highstock
 * @apioption plotOptions.series.dataGrouping
 */
/**
 * The method of approximation inside a group. When for example 30 days
 * are grouped into one month, this determines what value should represent
 * the group. Possible values are "average", "averages", "open", "high",
 * "low", "close" and "sum". For OHLC and candlestick series the approximation
 * is "ohlc" by default, which finds the open, high, low and close values
 * within all the grouped data. For ranges, the approximation is "range",
 * which finds the low and high values. For multi-dimensional data,
 * like ranges and OHLC, "averages" will compute the average for each
 * dimension.
 *
 * Custom aggregate methods can be added by assigning a callback function
 * as the approximation. This function takes a numeric array as the
 * argument and should return a single numeric value or `null`. Note
 * that the numeric array will never contain null values, only true
 * numbers. Instead, if null values are present in the raw data, the
 * numeric array will have an `.hasNulls` property set to `true`. For
 * single-value data sets the data is available in the first argument
 * of the callback function. For OHLC data sets, all the open values
 * are in the first argument, all high values in the second etc.
 *
 * Since v4.2.7, grouping meta data is available in the approximation
 * callback from `this.dataGroupInfo`. It can be used to extract information
 * from the raw data.
 *
 * Defaults to `average` for line-type series, `sum` for columns, `range`
 * for range series and `ohlc` for OHLC and candlestick.
 *
 * @sample {highstock} stock/plotoptions/series-datagrouping-approximation
 *         Approximation callback with custom data
 *
 * @type       {Highcharts.DataGroupingApproximationValue|Function}
 * @product    highstock
 * @apioption  plotOptions.series.dataGrouping.approximation
 */
/**
 * Datetime formats for the header of the tooltip in a stock chart.
 * The format can vary within a chart depending on the currently selected
 * time range and the current data grouping.
 *
 * The default formats are:
 *
 * <pre>{
 *     millisecond: [
 *         '%A, %b %e, %H:%M:%S.%L', '%A, %b %e, %H:%M:%S.%L', '-%H:%M:%S.%L'
 *     ],
 *     second: ['%A, %b %e, %H:%M:%S', '%A, %b %e, %H:%M:%S', '-%H:%M:%S'],
 *     minute: ['%A, %b %e, %H:%M', '%A, %b %e, %H:%M', '-%H:%M'],
 *     hour: ['%A, %b %e, %H:%M', '%A, %b %e, %H:%M', '-%H:%M'],
 *     day: ['%A, %b %e, %Y', '%A, %b %e', '-%A, %b %e, %Y'],
 *     week: ['Week from %A, %b %e, %Y', '%A, %b %e', '-%A, %b %e, %Y'],
 *     month: ['%B %Y', '%B', '-%B %Y'],
 *     year: ['%Y', '%Y', '-%Y']
 * }</pre>
 *
 * For each of these array definitions, the first item is the format
 * used when the active time span is one unit. For instance, if the
 * current data applies to one week, the first item of the week array
 * is used. The second and third items are used when the active time
 * span is more than two units. For instance, if the current data applies
 * to two weeks, the second and third item of the week array are used,
 *  and applied to the start and end date of the time span.
 *
 * @type      {object}
 * @product   highstock
 * @apioption plotOptions.series.dataGrouping.dateTimeLabelFormats
 */
/**
 * Enable or disable data grouping.
 *
 * @type      {boolean}
 * @default   true
 * @product   highstock
 * @apioption plotOptions.series.dataGrouping.enabled
 */
/**
 * When data grouping is forced, it runs no matter how small the intervals
 * are. This can be handy for example when the sum should be calculated
 * for values appearing at random times within each hour.
 *
 * @type      {boolean}
 * @default   false
 * @product   highstock
 * @apioption plotOptions.series.dataGrouping.forced
 */
/**
 * The approximate pixel width of each group. If for example a series
 * with 30 points is displayed over a 600 pixel wide plot area, no grouping
 * is performed. If however the series contains so many points that
 * the spacing is less than the groupPixelWidth, Highcharts will try
 * to group it into appropriate groups so that each is more or less
 * two pixels wide. If multiple series with different group pixel widths
 * are drawn on the same x axis, all series will take the greatest width.
 * For example, line series have 2px default group width, while column
 * series have 10px. If combined, both the line and the column will
 * have 10px by default.
 *
 * @type      {number}
 * @default   2
 * @product   highstock
 * @apioption plotOptions.series.dataGrouping.groupPixelWidth
 */
/**
 * By default only points within the visible range are grouped. Enabling this
 * option will force data grouping to calculate all grouped points for a given
 * dataset. That option prevents for example a column series from calculating
 * a grouped point partially. The effect is similar to
 * [Series.getExtremesFromAll](#plotOptions.series.getExtremesFromAll) but does
 * not affect yAxis extremes.
 *
 * @sample {highstock} stock/plotoptions/series-datagrouping-groupall/
 *         Two series with the same data but different groupAll setting
 *
 * @type      {boolean}
 * @default   false
 * @since     6.1.0
 * @product   highstock
 * @apioption plotOptions.series.dataGrouping.groupAll
 */
/**
 * Normally, a group is indexed by the start of that group, so for example
 * when 30 daily values are grouped into one month, that month's x value
 * will be the 1st of the month. This apparently shifts the data to
 * the left. When the smoothed option is true, this is compensated for.
 * The data is shifted to the middle of the group, and min and max
 * values are preserved. Internally, this is used in the Navigator series.
 *
 * @type      {boolean}
 * @default   false
 * @product   highstock
 * @apioption plotOptions.series.dataGrouping.smoothed
 */
/**
 * An array determining what time intervals the data is allowed to be
 * grouped to. Each array item is an array where the first value is
 * the time unit and the second value another array of allowed multiples.
 * Defaults to:
 *
 * <pre>units: [[
 *     'millisecond', // unit name
 *     [1, 2, 5, 10, 20, 25, 50, 100, 200, 500] // allowed multiples
 * ], [
 *     'second',
 *     [1, 2, 5, 10, 15, 30]
 * ], [
 *     'minute',
 *     [1, 2, 5, 10, 15, 30]
 * ], [
 *     'hour',
 *     [1, 2, 3, 4, 6, 8, 12]
 * ], [
 *     'day',
 *     [1]
 * ], [
 *     'week',
 *     [1]
 * ], [
 *     'month',
 *     [1, 3, 6]
 * ], [
 *     'year',
 *     null
 * ]]</pre>
 *
 * @type      {Array<Array<string,(Array<number>|null)>>}
 * @product   highstock
 * @apioption plotOptions.series.dataGrouping.units
 */
/**
 * The approximate pixel width of each group. If for example a series
 * with 30 points is displayed over a 600 pixel wide plot area, no grouping
 * is performed. If however the series contains so many points that
 * the spacing is less than the groupPixelWidth, Highcharts will try
 * to group it into appropriate groups so that each is more or less
 * two pixels wide. Defaults to `10`.
 *
 * @sample {highstock} stock/plotoptions/series-datagrouping-grouppixelwidth/
 *         Two series with the same data density but different groupPixelWidth
 *
 * @type      {number}
 * @default   10
 * @product   highstock
 * @apioption plotOptions.column.dataGrouping.groupPixelWidth
 */
''; // required by JSDoc parsing
