<?php declare(strict_types=1);

/**
 * Device Detector - The Universal Device Detection library for parsing User Agents
 *
 * @link https://matomo.org
 *
 * @license http://www.gnu.org/licenses/lgpl.html LGPL v3 or later
 */

namespace DeviceDetector\Parser\Device;

/**
 * Class HbbTv
 *
 * Device parser for hbbtv detection
 */
class HbbTv extends AbstractDeviceParser
{
    /**
     * @var string
     */
    protected $fixtureFile = 'regexes/device/televisions.yml';

    /**
     * @var string
     */
    protected $parserName = 'tv';

    /**
     * Parses the current UA and checks whether it contains HbbTv information
     *
     * @see televisions.yml for list of detected televisions
     *
     * @return array|null
     */
    public function parse(): ?array
    {
        // only parse user agents containing hbbtv fragment
        if (null === $this->isHbbTv()) {
            return null;
        }

        parent::parse();

        // always set device type to tv, even if no model/brand could be found
        $this->deviceType = self::DEVICE_TYPE_TV;

        return $this->getResult();
    }

    /**
     * Returns if the parsed UA was identified as a HbbTV device
     *
     * @return string|null
     */
    public function isHbbTv(): ?string
    {
        $regex = 'HbbTV/([1-9]{1}(?:\.[0-9]{1}){1,2})';
        $match = $this->matchUserAgent($regex);

        return $match[1] ?? null;
    }
}