<?php

declare(strict_types=1);

namespace App\Services;

use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;

readonly class IpLookupService
{
    private const array BLOCKLISTS = [
        // FireHol - All Levels (werkt)
        'firehol_level1' => 'https://raw.githubusercontent.com/firehol/blocklist-ipsets/master/firehol_level1.netset',
        'firehol_level2' => 'https://raw.githubusercontent.com/firehol/blocklist-ipsets/master/firehol_level2.netset',
        'firehol_level3' => 'https://raw.githubusercontent.com/firehol/blocklist-ipsets/master/firehol_level3.netset',
        'firehol_level4' => 'https://raw.githubusercontent.com/firehol/blocklist-ipsets/master/firehol_level4.netset',

        // Spamhaus (werkt)
        'spamhaus_drop' => 'https://www.spamhaus.org/drop/drop.txt',
        'spamhaus_edrop' => 'https://www.spamhaus.org/drop/edrop.txt',

        // Threat Intelligence (werkt)
        'dshield' => 'https://raw.githubusercontent.com/firehol/blocklist-ipsets/master/dshield.netset',
        'emerging_threats' => 'https://rules.emergingthreats.net/blockrules/compromised-ips.txt',

        // Blocklist.de (werkt)
        'blocklist_de_all' => 'https://lists.blocklist.de/lists/all.txt',
        'blocklist_de_mail' => 'https://lists.blocklist.de/lists/mail.txt',
        'blocklist_de_ssh' => 'https://lists.blocklist.de/lists/ssh.txt',
        'blocklist_de_ftp' => 'https://lists.blocklist.de/lists/ftp.txt',
        'blocklist_de_sip' => 'https://lists.blocklist.de/lists/sip.txt',
    ];

    private const int CACHE_TIME = 43200;

    public function getCountryInfo(string $ip): array
    {
        $cacheKey = "ip_country_{$ip}";

        return Cache::remember($cacheKey, now()->addDays(7), function () use ($ip) {
            try {
                $response = Http::timeout(10)->get("http://ip-api.com/json/{$ip}");

                if ($response->ok()) {
                    $data = $response->json();

                    return [
                        'country_code' => $data['countryCode'] ?? null,
                        'country_name' => $data['country'] ?? null,
                        'region' => $data['regionName'] ?? null,
                        'city' => $data['city'] ?? null,
                        'isp' => $data['isp'] ?? null,
                        'org' => $data['org'] ?? null,
                        'as' => $data['as'] ?? null,
                    ];
                }
            } catch (\Exception $e) {
                return ['error' => $e->getMessage()];
            }

            return ['error' => 'Failed to fetch'];
        });
    }

    public function checkVpnProxyTor(string $ip): array
    {
        $cacheKey = "ip_check_{$ip}";

        return Cache::remember($cacheKey, now()->addHours(6), function () use ($ip) {
            $isBlocked = $this->isIpInAnyBlocklist($ip);

            return [
                'is_vpn' => $isBlocked,
                'is_proxy' => $isBlocked,
                'is_tor' => $isBlocked,
                'is_malicious' => $isBlocked,
                'source' => 'multi_blocklist',
            ];
        });
    }

    private function isIpInAnyBlocklist(string $ip): bool
    {
        foreach (self::BLOCKLISTS as $name => $url) {
            $cidrs = $this->getBlocklistCidrs($name, $url);

            foreach ($cidrs as $cidr) {
                if ($this->ipInCidr($ip, $cidr)) {
                    return true;
                }
            }
        }

        return false;
    }

    private function getBlocklistCidrs(string $name, string $url): array
    {
        $cacheKey = "cidr_blocklist_{$name}";

        return Cache::remember($cacheKey, now()->addHours(self::CACHE_TIME), function () use ($url) {
            try {
                $response = Http::timeout(120)->get($url);

                if (! $response->ok()) {
                    return [];
                }

                $lines = explode("\n", $response->body());
                $cidrs = [];

                foreach ($lines as $line) {
                    $line = trim($line);

                    if ($line === '' || $line === '0' || str_starts_with($line, '#') || str_starts_with($line, ';')) {
                        continue;
                    }

                    if (str_contains($line, '/')) {
                        $cidrs[] = $line;
                    } elseif (filter_var($line, FILTER_VALIDATE_IP)) {
                        $cidrs[] = $line . '/32';
                    }
                }

                return $cidrs;
            } catch (\Exception) {
                return [];
            }
        });
    }

    private function ipInCidr(string $ip, string $cidr): bool
    {
        if (! str_contains($cidr, '/')) {
            return $ip === $cidr;
        }

        try {
            [$subnet, $mask] = explode('/', $cidr);
            $mask = (int) $mask;

            if ($mask < 0 || $mask > 32) {
                return false;
            }

            $ipLong = ip2long($ip);
            $subnetLong = ip2long($subnet);

            if ($ipLong === false || $subnetLong === false) {
                return false;
            }

            $maskLong = -1 << (32 - $mask);

            return ($ipLong & $maskLong) === ($subnetLong & $maskLong);
        } catch (\Exception) {
            return false;
        }
    }

    public function refreshBlocklists(): void
    {
        foreach (array_keys(self::BLOCKLISTS) as $name) {
            Cache::forget("cidr_blocklist_{$name}");
        }
    }

    public function getBlocklistStats(): array
    {
        $totalCidrs = 0;

        foreach (self::BLOCKLISTS as $name => $url) {
            $cidrs = $this->getBlocklistCidrs($name, $url);
            $totalCidrs += count($cidrs);
        }

        return [
            'total' => $totalCidrs,
            'source' => 'multi_blocklist',
        ];
    }
}