class ColorHSL

class ColorHSL extends ColorBase {
    
    /**
     * Hue value (0-360).
     *
     * @var int
     */
    protected int $hue;
    
    /**
     * Saturation value (0-100).
     *
     * @var int
     */
    protected int $sat;
    
    /**
     * Luminance value (0-100).
     *
     * @var int
     */
    protected int $lum;
    
    /**
     * Create a new HSL color.
     *
     * @param int $hue
     *   The hue (0-360)
     * @param int $sat
     *   The sat (0-100)
     * @param int $lum
     *   The lum (0-100)
     * @param float $opacity
     *   The opacity.
     *
     * @throws \Exception
     */
    public function __construct(int $hue, int $sat, int $lum, float $opacity) {
        if ($hue < 0 || $hue > 360) {
            throw new \Exception("Invalid hue: {$hue}");
        }
        if ($sat < 0 || $sat > 100) {
            throw new \Exception("Invalid saturation: {$sat}");
        }
        if ($lum < 0 || $lum > 100) {
            throw new \Exception("Invalid luminosity: {$lum}");
        }
        $this->hue = $hue;
        $this->sat = $sat;
        $this->lum = $lum;
        $this->opacity = $opacity;
    }
    
    /**
     * Get the hue value.
     *
     * @return int
     *   The hue value
     */
    public function getHue() : int {
        return $this->hue;
    }
    
    /**
     * Get the sat value.
     *
     * @return int
     *   The sat value
     */
    public function getSat() : int {
        return $this->sat;
    }
    
    /**
     * Get the lum value.
     *
     * @return int
     *   The lum value
     */
    public function getLum() : int {
        return $this->lum;
    }
    
    /**
     * A string representation of this color in the current format.
     *
     * @param bool $opacity
     *   Whether to display the opacity.
     *
     * @return string
     *   The color as hsla(#, #, #, #) or hsl(#, #, #) if opacity is false.
     */
    public function toString(bool $opacity = TRUE) : string {
        $output = $opacity ? 'hsla(' . $this->hue . ',' . $this->sat . ',' . $this->lum . ',' . $this->getOpacity() . ')' : 'hsl(' . $this->hue . ',' . $this->sat . ',' . $this->lum . ')';
        return strtolower($output);
    }
    
    /**
     * {@inheritdoc}
     */
    public function toHex() : ColorHex {
        return $this->toRGB()
            ->toHex();
    }
    
    /**
     * {@inheritdoc}
     */
    public function toRgb() : ColorRGB {
        $h = $this->getHue();
        $s = $this->getSat();
        $l = $this->getLum();
        $h /= 60;
        if ($h < 0) {
            $h = 6 - fmod(-$h, 6);
        }
        $h = fmod($h, 6);
        $s = max(0, min(1, $s / 100));
        $l = max(0, min(1, $l / 100));
        $c = (1 - abs(2 * $l - 1)) * $s;
        $x = $c * (1 - abs(fmod($h, 2) - 1));
        if ($h < 1) {
            $r = $c;
            $g = $x;
            $b = 0;
        }
        elseif ($h < 2) {
            $r = $x;
            $g = $c;
            $b = 0;
        }
        elseif ($h < 3) {
            $r = 0;
            $g = $c;
            $b = $x;
        }
        elseif ($h < 4) {
            $r = 0;
            $g = $x;
            $b = $c;
        }
        elseif ($h < 5) {
            $r = $x;
            $g = 0;
            $b = $c;
        }
        else {
            $r = $c;
            $g = 0;
            $b = $x;
        }
        $m = $l - $c / 2;
        $r = round(($r + $m) * 255);
        $g = round(($g + $m) * 255);
        $b = round(($b + $m) * 255);
        return new ColorRGB((int) $r, (int) $g, (int) $b, $this->getOpacity());
    }
    
    /**
     * {@inheritdoc}
     */
    public function toHsl() : ColorHSL {
        return $this;
    }

}