---

const DEFAULT_INDICATOR_COLORS = [
  '#2962FF',
  '#FF6D00',
  '#00C853',
  '#D500F9',
  '#FF1744',
  '#00B8D4',
  '#FFD600',
  '#7C4DFF',
  '#64DD17',
  '#FF4081',
];

export function getNextIndicatorColor(usedColors: readonly string[]): string {
  const normalizedUsedColors = new Set(usedColors.map((color) => color.toLowerCase()));

  const freeColor = DEFAULT_INDICATOR_COLORS.find((color) => !normalizedUsedColors.has(color.toLowerCase()));

  if (freeColor) {
    return freeColor;
  }

  return generateColorByIndex(usedColors.length);
}

function generateColorByIndex(index: number): string {
  const hue = (index * 137.508) % 360;

  return `hsl(${Math.round(hue)}deg 72% 56%)`;
}



export function applyIndicatorColor(config: IndicatorConfig, color: string): IndicatorConfig {
  return {
    ...config,
    series: config.series.map((series) => {
      const isVisibleLine = series.name === 'Line' && series.seriesOptions?.visible !== false;

      if (!isVisibleLine) {
        return series;
      }

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