export class Color {
  public hslToRgb(h: number, s: number, l: number): number[] {
    let r, g, b;

    if (s === 0) {
      r = g = b = l;
    } else {
      const q = l < 0.5 ? l * (1 + s) : l + s - l * s;
      const p = 2 * l - q;

      r = this.hue2rgb(p, q, h + 1 / 3);
      g = this.hue2rgb(p, q, h);
      b = this.hue2rgb(p, q, h - 1 / 3);
    }

    return [Math.floor(r * 255), Math.floor(g * 255), Math.floor(b * 255)];
  }

  private hue2rgb(p: number, q: number, t: number): number {
    if (t < 0) {
      t += 1;
    }
    if (t > 1) {
      t -= 1;
    }
    if (t < 1 / 6) {
      return p + (q - p) * 6 * t;
    }
    if (t < 1 / 2) {
      return q;
    }
    if (t < 2 / 3) {
      return p + (q - p) * (2 / 3 - t) * 6;
    }

    return p;
  }
}