/* *
 *
 *  A commercial license may be required depending on use.
 *  See www.highcharts.com/license
 *
 *
 * */
'use strict';
import SeriesRegistry from '../../../Core/Series/SeriesRegistry.js';
const { sma: SMAIndicator } = SeriesRegistry.seriesTypes;
import U from '../../../Core/Utilities.js';
const { isNumber, merge } = U;
/* *
 *
 *  Functions
 *
 * */
// Utils:
/**
 *
 */
function toFixed(a, n) {
    return parseFloat(a.toFixed(n));
}
/* *
 *
 *  Class
 *
 * */
/**
 * The RSI series type.
 *
 * @private
 * @class
 * @name Highcharts.seriesTypes.rsi
 *
 * @augments Highcharts.Series
 */
class RSIIndicator extends SMAIndicator {
    /* *
     *
     *  Functions
     *
     * */
    getValues(series, params) {
        const period = params.period, xVal = series.xData, yVal = series.yData, yValLen = yVal ? yVal.length : 0, decimals = params.decimals, 
        // RSI starts calculations from the second point
        // Cause we need to calculate change between two points
        RSI = [], xData = [], yData = [];
        let gain = 0, loss = 0, index = params.index, range = 1, RSIPoint, change, avgGain, avgLoss, i, values;
        if ((xVal.length < period)) {
            return;
        }
        if (isNumber(yVal[0])) {
            values = yVal;
        }
        else {
            // In case of the situation, where the series type has data length
            // longer then 4 (HLC, range), this ensures that we are not trying
            // to reach the index out of bounds
            index = Math.min(index, yVal[0].length - 1);
            values = yVal
                .map((value) => value[index]);
        }
        // Calculate changes for first N points
        while (range < period) {
            change = toFixed(values[range] - values[range - 1], decimals);
            if (change > 0) {
                gain += change;
            }
            else {
                loss += Math.abs(change);
            }
            range++;
        }
        // Average for first n-1 points:
        avgGain = toFixed(gain / (period - 1), decimals);
        avgLoss = toFixed(loss / (period - 1), decimals);
        for (i = range; i < yValLen; i++) {
            change = toFixed(values[i] - values[i - 1], decimals);
            if (change > 0) {
                gain = change;
                loss = 0;
            }
            else {
                gain = 0;
                loss = Math.abs(change);
            }
            // Calculate smoothed averages, RS, RSI values:
            avgGain = toFixed((avgGain * (period - 1) + gain) / period, decimals);
            avgLoss = toFixed((avgLoss * (period - 1) + loss) / period, decimals);
            // If average-loss is equal zero, then by definition RSI is set
            // to 100:
            if (avgLoss === 0) {
                RSIPoint = 100;
                // If average-gain is equal zero, then by definition RSI is set
                // to 0:
            }
            else if (avgGain === 0) {
                RSIPoint = 0;
            }
            else {
                RSIPoint = toFixed(100 - (100 / (1 + (avgGain / avgLoss))), decimals);
            }
            RSI.push([xVal[i], RSIPoint]);
            xData.push(xVal[i]);
            yData.push(RSIPoint);
        }
        return {
            values: RSI,
            xData: xData,
            yData: yData
        };
    }
}
/* *
 *
 *  Static Properties
 *
 * */
/**
 * Relative strength index (RSI) technical indicator. This series
 * requires the `linkedTo` option to be set and should be loaded after
 * the `stock/indicators/indicators.js` file.
 *
 * @sample stock/indicators/rsi
 *         RSI indicator
 *
 * @extends      plotOptions.sma
 * @since        6.0.0
 * @product      highstock
 * @requires     stock/indicators/indicators
 * @requires     stock/indicators/rsi
 * @optionparent plotOptions.rsi
 */
RSIIndicator.defaultOptions = merge(SMAIndicator.defaultOptions, {
    params: {
        decimals: 4,
        index: 3
    }
});
SeriesRegistry.registerSeriesType('rsi', RSIIndicator);
/* *
 *
 *  Default Export
 *
 * */
export default RSIIndicator;
/* *
 *
 *  API Options
 *
 * */
/**
 * A `RSI` series. If the [type](#series.rsi.type) option is not
 * specified, it is inherited from [chart.type](#chart.type).
 *
 * @extends   series,plotOptions.rsi
 * @since     6.0.0
 * @product   highstock
 * @excluding dataParser, dataURL
 * @requires  stock/indicators/indicators
 * @requires  stock/indicators/rsi
 * @apioption series.rsi
 */
''; // To include the above in the js output
