<?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 ShellTv
 */
class ShellTv extends AbstractDeviceParser
{
    /**
     * @var string
     */
    protected $fixtureFile = 'regexes/device/shell_tv.yml';

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

    /**
     * Returns if the parsed UA was identified as ShellTv device
     *
     * @return bool
     *
     * @throws \Exception
     */
    public function isShellTv(): bool
    {
        $regex = '[a-z]+[ _]Shell[ _]\w{6}';
        $match = $this->matchUserAgent($regex);

        return null !== $match;
    }

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