<?php
namespace Misuzu;

use InvalidArgumentException;
use Stringable;
use DeviceDetector\ClientHints;
use DeviceDetector\DeviceDetector;

class ClientInfo implements Stringable {
    private DeviceDetector $dd;

    public function __construct(DeviceDetector $dd) {
        $this->dd = $dd;
    }

    public function __toString(): string {
        if($this->dd->isBot()) {
            $botInfo = $this->dd->getBot();
            return $botInfo['name'] ?? 'an unknown bot';
        }

        $clientInfo = $this->dd->getClient();
        if(empty($clientInfo['name']))
            return 'an unknown browser';

        $string = $clientInfo['name'];
        if(!empty($clientInfo['version']))
            $string .= ' ' . $clientInfo['version'];

        $osInfo = $this->dd->getOs();
        $hasOsInfo = !empty($osInfo['name']);

        $brandName = $this->dd->getBrandName();
        $modelName = $this->dd->getModel();
        $hasModelName = !empty($modelName);

        if($hasOsInfo || $hasModelName)
            $string .= ' on ';

        if($hasModelName) {
            $deviceName = trim($brandName . ' ' . $modelName);
            // most naive check in the world but it works well enough for this lol
            $firstCharIsVowel = in_array(strtolower($deviceName[0]), ['a', 'i', 'u', 'e', 'o']);
            $string .= ($firstCharIsVowel ? 'an' : 'a') . ' ' . $deviceName;
        }

        if($hasOsInfo) {
            if($hasModelName)
                $string .= ' running ';

            $string .= $osInfo['name'];
            if(!empty($osInfo['version']))
                $string .= ' ' . $osInfo['version'];
            if(!empty($osInfo['platform']))
                $string .= ' (' . $osInfo['platform'] . ')';
        }

        return $string;
    }

    public static function parse(array|string $serverVarsOrUserAgent): self {
        if(is_string($serverVarsOrUserAgent)) {
            $userAgent = $serverVarsOrUserAgent;
            $clientHints = null;
        } else {
            $userAgent = array_key_exists('HTTP_USER_AGENT', $serverVarsOrUserAgent)
                ? $serverVarsOrUserAgent['HTTP_USER_AGENT'] : '';
            $clientHints = ClientHints::factory($serverVarsOrUserAgent);
        }

        $dd = new DeviceDetector($userAgent, $clientHints);
        $dd->parse();

        return new static($dd);
    }
}