/* *
 * (c) 2010-2017 Sebastian Bochan
 *
 * License: www.highcharts.com/license
 */

'use strict';

import H from '../parts/Globals.js';
import '../parts/Utilities.js';
import '../parts/Options.js';
import derivedSeriesMixin from '../mixins/derived-series.js';

var correctFloat = H.correctFloat,
    seriesType = H.seriesType,
    merge = H.merge;


/**
 * The pareto series type.
 *
 * @private
 * @class
 * @name Highcharts.seriesTypes.pareto
 *
 * @augments Highcharts.Series
 */
seriesType('pareto', 'line'

/**
 * A pareto diagram is a type of chart that contains both bars and a line graph,
 * where individual values are represented in descending order by bars, and the
 * cumulative total is represented by the line.
 *
 * @sample {highcharts} highcharts/demo/pareto/
 *         Pareto diagram
 *
 * @extends      plotOptions.line
 * @since        6.0.0
 * @product      highcharts
 * @excluding    allAreas, boostThreshold, borderColor, borderRadius,
 *               borderWidth, crisp, colorAxis, depth, data, edgeColor,
 *               edgeWidth, findNearestPointBy, gapSize, gapUnit, grouping,
 *               groupPadding, groupZPadding, maxPointWidth, keys,
 *               negativeColor, pointInterval, pointIntervalUnit, pointPadding,
 *               pointPlacement, pointRange, pointStart, pointWidth, shadow,
 *               step, softThreshold, stacking, threshold, zoneAxis, zones
 * @optionparent plotOptions.pareto
 */
, {
    /**
     * Higher zIndex than column series to draw line above shapes.
     */
    zIndex: 3
}, merge(derivedSeriesMixin, {
    /**
     * Calculate sum and return percent points.
     *
     * @private
     * @function Highcharts.Series#setDerivedData
     *
     * @return {Array<Array<number,number>>}
     *         Returns array of points [x,y]
     */
    setDerivedData: function () {
        if (this.baseSeries.yData.length > 1) {
            var xValues = this.baseSeries.xData,
                yValues = this.baseSeries.yData,
                sum = this.sumPointsPercents(yValues, xValues, null, true);

            this.setData(
                this.sumPointsPercents(yValues, xValues, sum, false),
                false
            );
        }
    },
    /**
     * Calculate y sum and each percent point.
     *
     * @private
     * @function Highcharts.Series#sumPointsPercents
     *
     * @param {Array<number>} yValues
     *        Y values
     *
     * @param {Array<number>} xValues
     *        X values
     *
     * @param {number} sum
     *        Sum of all y values
     *
     * @param {boolean} [isSum]
     *        Declares if calculate sum of all points
     *
     * @return {number|Array<number,number>}
     *         Returns sum of points or array of points [x,sum]
     */
    sumPointsPercents: function (yValues, xValues, sum, isSum) {
        var sumY = 0,
            sumPercent = 0,
            percentPoints = [],
            percentPoint;

        yValues.forEach(function (point, i) {
            if (point !== null) {
                if (isSum) {
                    sumY += point;
                } else {
                    percentPoint = (point / sum) * 100;
                    percentPoints.push(
                        [xValues[i], correctFloat(sumPercent + percentPoint)]
                    );
                    sumPercent += percentPoint;
                }
            }
        });

        return isSum ? sumY : percentPoints;
    }
}));

/**
 * A `pareto` series. If the [type](#series.pareto.type) option is not
 * specified, it is inherited from [chart.type](#chart.type).
 *
 * @extends   series,plotOptions.pareto
 * @since     6.0.0
 * @product   highcharts
 * @excluding data, dataParser, dataURL
 * @apioption series.pareto
 */

/**
 * An integer identifying the index to use for the base series, or a string
 * representing the id of the series.
 *
 * @type      {number|string}
 * @default   undefined
 * @apioption series.pareto.baseSeries
 */

/**
 * An array of data points for the series. For the `pareto` series type,
 * points are calculated dynamically.
 *
 * @type      {Array<Array<number|string>|*>}
 * @extends   series.column.data
 * @since     6.0.0
 * @product   highcharts
 * @apioption series.pareto.data
 */
