---

export function applyNextIndicatorColors(config: IndicatorConfig, usedColors: readonly string[]): IndicatorConfig {
  const nextConfig = cloneDeep(config);
  const reservedColors = new Set(usedColors.map(normalizeColor));
  const colorizableSeriesCount = nextConfig.series.filter(shouldUsePaletteColor).length;
  const startIndex = getNextFreePaletteIndex(reservedColors);

  let colorizableSeriesIndex = 0;

  nextConfig.series = nextConfig.series.map((serie) => {
    if (!shouldUsePaletteColor(serie)) {
      return serie;
    }

    const color =
      colorizableSeriesCount > 1
        ? getGroupedPaletteColor(reservedColors, startIndex, colorizableSeriesIndex, colorizableSeriesCount)
        : getNextPaletteColor(reservedColors);

    colorizableSeriesIndex += 1;
    reservedColors.add(normalizeColor(color));

    return {
      ...serie,
      seriesOptions: {
        ...serie.seriesOptions,
        color,
      },
    };
  });

  return nextConfig;
}