/* *
 *
 *  License: www.highcharts.com/license
 *
 * */

'use strict';

import H from '../parts/Globals.js';
import multipleLinesMixin from '../mixins/multipe-lines.js';

// Utils

// Index of element with extreme value from array (min or max)
function getExtremeIndexInArray(arr, extreme) {
    var extremeValue = arr[0],
        valueIndex = 0,
        i;

    for (i = 1; i < arr.length; i++) {
        if (
            extreme === 'max' && arr[i] >= extremeValue ||
            extreme === 'min' && arr[i] <= extremeValue
        ) {
            extremeValue = arr[i];
            valueIndex = i;
        }
    }

    return valueIndex;
}

/**
 * The Aroon series type.
 *
 * @private
 * @class
 * @name Highcharts.seriesTypes.aroon
 *
 * @augments Highcharts.Series
 */
H.seriesType(
    'aroon',
    'sma',
    /**
     * Aroon. This series requires the `linkedTo` option to be
     * set and should be loaded after the `stock/indicators/indicators.js`.
     *
     * @sample {highstock} stock/indicators/aroon
     *         Aroon
     *
     * @extends      plotOptions.sma
     * @since        7.0.0
     * @product      highstock
     * @excluding    allAreas, colorAxis, compare, compareBase, joinBy, keys,
     *               navigatorOptions, pointInterval, pointIntervalUnit,
     *               pointPlacement, pointRange, pointStart, showInNavigator,
     *               stacking
     * @optionparent plotOptions.aroon
     */
    {
        /**
         * Paramters used in calculation of aroon series points.
         *
         * @excluding periods, index
         */
        params: {
            /**
             * Period for Aroon indicator
             */
            period: 25
        },
        marker: {
            enabled: false
        },
        tooltip: {
            pointFormat: '<span style="color:{point.color}">\u25CF</span><b> {series.name}</b><br/>Aroon Up: {point.y}<br/>Aroon Down: {point.aroonDown}<br/>'
        },
        /**
         * aroonDown line options.
         */
        aroonDown: {
            /**
             * Styles for an aroonDown line.
             */
            styles: {
                /**
                 * Pixel width of the line.
                 */
                lineWidth: 1,
                /**
                 * Color of the line. If not set, it's inherited from
                 * [plotOptions.aroon.color](#plotOptions.aroon.color).
                 *
                 * @type {Highcharts.ColorString}
                 */
                lineColor: undefined
            }
        },
        dataGrouping: {
            approximation: 'averages'
        }
    },
    /**
     * @lends Highcharts.Series#
     */
    H.merge(multipleLinesMixin, {
        nameBase: 'Aroon',
        pointArrayMap: ['y', 'aroonDown'],
        pointValKey: 'y',
        linesApiNames: ['aroonDown'],
        getValues: function (series, params) {
            var period = params.period,
                xVal = series.xData,
                yVal = series.yData,
                yValLen = yVal ? yVal.length : 0,
                AR = [], // 0- date, 1- Aroon Up, 2- Aroon Down
                xData = [],
                yData = [],
                slicedY,
                low = 2,
                high = 1,
                aroonUp,
                aroonDown,
                xLow,
                xHigh,
                i;

            // For a N-period, we start from N-1 point, to calculate Nth point
            // That is why we later need to comprehend slice() elements list
            // with (+1)
            for (i = period - 1; i < yValLen; i++) {
                slicedY = yVal.slice(i - period + 1, i + 2);

                xLow = getExtremeIndexInArray(slicedY.map(function (elem) {
                    return H.pick(elem[low], elem);
                }), 'min');

                xHigh = getExtremeIndexInArray(slicedY.map(function (elem) {
                    return H.pick(elem[high], elem);
                }), 'max');

                aroonUp = (xHigh / period) * 100;
                aroonDown = (xLow / period) * 100;

                if (xVal[i + 1]) {
                    AR.push([xVal[i + 1], aroonUp, aroonDown]);
                    xData.push(xVal[i + 1]);
                    yData.push([aroonUp, aroonDown]);
                }
            }

            return {
                values: AR,
                xData: xData,
                yData: yData
            };
        }
    })
);

/**
 * A Aroon indicator. If the [type](#series.aroon.type) option is not
 * specified, it is inherited from [chart.type](#chart.type).
 *
 * @extends   series,plotOptions.aroon
 * @since     7.0.0
 * @product   highstock
 * @excluding allAreas, colorAxis, compare, compareBase, dataParser, dataURL,
 *            joinBy, keys, navigatorOptions, pointInterval, pointIntervalUnit,
 *            pointPlacement, pointRange, pointStart, showInNavigator, stacking
 * @apioption series.aroon
 */