<?php

declare (strict_types=1);
namespace WP2FA_Vendor\BaconQrCode\Renderer\RendererStyle;

use WP2FA_Vendor\BaconQrCode\Exception\RuntimeException;
use WP2FA_Vendor\BaconQrCode\Renderer\Color\ColorInterface;
final class EyeFill
{
    /**
     * @var ColorInterface|null
     */
    private $externalColor;
    /**
     * @var ColorInterface|null
     */
    private $internalColor;
    /**
     * @var self|null
     */
    private static $inherit;
    public function __construct(?ColorInterface $externalColor, ?ColorInterface $internalColor)
    {
        $this->externalColor = $externalColor;
        $this->internalColor = $internalColor;
    }
    public static function uniform(ColorInterface $color) : self
    {
        return new self($color, $color);
    }
    public static function inherit() : self
    {
        return self::$inherit ?: (self::$inherit = new self(null, null));
    }
    public function inheritsBothColors() : bool
    {
        return null === $this->externalColor && null === $this->internalColor;
    }
    public function inheritsExternalColor() : bool
    {
        return null === $this->externalColor;
    }
    public function inheritsInternalColor() : bool
    {
        return null === $this->internalColor;
    }
    public function getExternalColor() : ColorInterface
    {
        if (null === $this->externalColor) {
            throw new RuntimeException('External eye color inherits foreground color');
        }
        return $this->externalColor;
    }
    public function getInternalColor() : ColorInterface
    {
        if (null === $this->internalColor) {
            throw new RuntimeException('Internal eye color inherits foreground color');
        }
        return $this->internalColor;
    }
}
