<?php

class RequestLogger
{
    private string $logFile;

    public function __construct(string $logFile)
    {
        $this->logFile = $logFile;
    }

    public function log(string $page, string $ip, string $userAgent, string $referrer, string $host, string $acceptLanguage): void
    {
        $dir = dirname($this->logFile);
        if (!is_dir($dir)) {
            @mkdir($dir, 0755, true);
        }

        $timestamp = date('Y-m-d H:i:s');
        $ua = substr(preg_replace('/[[:cntrl:]]/', '', $userAgent), 0, 500);
        $ref = substr(preg_replace('/[[:cntrl:]]/', '', $referrer), 0, 500);
        $line = "[{$timestamp}] [{$ip}] [{$host}] [{$acceptLanguage}] [{$page}] [{$ua}] [{$ref}]\n";
        @file_put_contents($this->logFile, $line, FILE_APPEND | LOCK_EX);
    }

    public static function detectBot(): ?string
    {
        $ua = $_SERVER['HTTP_USER_AGENT'] ?? '';
        if (empty($ua)) return null;

        $bots = [
            'AI' => [
                'GPTBot', 'ChatGPT-User', 'Claude-Web', 'ClaudeBot',
                'anthropic-ai', 'Google-Extended', 'CCBot',
                'PerplexityBot', 'Amazonbot', 'cohere-ai',
                'OAI-SearchBot', 'Bytespider', 'FacebookBot',
                'Applebot-Extended',
            ],
            'Search' => [
                'Googlebot', 'Bingbot', 'BingPreview', 'Slurp',
                'DuckDuckBot', 'Baiduspider', 'YandexBot',
                'Sogou', 'Exabot', 'facebot',
            ],
            'Scraper' => [
                'HTTrack', 'Scrapy', 'PhantomJS', 'HeadlessChrome',
            ],
        ];

        foreach ($bots as $category => $patterns) {
            foreach ($patterns as $pattern) {
                if (stripos($ua, $pattern) !== false) {
                    return $category;
                }
            }
        }

        return null;
    }

    public function getLogs(int $lines = 100): array
    {
        if (!file_exists($this->logFile)) {
            return [];
        }

        $content = file($this->logFile);
        $content = array_slice($content, -$lines);
        $logs = [];

        foreach ($content as $line) {
            if (preg_match('/^\[([^\]]+)\] \[([^\]]+)\] \[([^\]]+)\] \[([^\]]*)\] \[([^\]]+)\] \[([^\]]*)\] \[([^\]]*)\]$/', trim($line), $m)) {
                $logs[] = [
                    'time' => $m[1],
                    'ip' => $m[2],
                    'host' => $m[3],
                    'lang' => $m[4],
                    'page' => $m[5],
                    'ua' => $m[6],
                    'referrer' => $m[7],
                ];
            }
        }

        return array_reverse($logs);
    }
}