<?php

namespace App\Services\Qr;

use App\Models\QrCode;
use App\Models\QrScanEvent;
use App\Models\QrWallet;
use Carbon\Carbon;
use Illuminate\Http\Request;
use Illuminate\Support\Str;

class QrScanRecorder
{
    public function record(QrCode $qrCode, Request $request): QrScanEvent
    {
        $parsed = $this->parseUserAgent((string) $request->userAgent());
        $ipHash = $this->hashIp((string) $request->ip());
        $windowHours = (int) config('qr.scan_unique_window_hours', 24);
        $isUnique = ! QrScanEvent::query()
            ->where('qr_code_id', $qrCode->id)
            ->where('ip_hash', $ipHash)
            ->where('scanned_at', '>=', now()->subHours($windowHours))
            ->exists();

        $event = QrScanEvent::create([
            'qr_code_id' => $qrCode->id,
            'scanned_at' => now(),
            'ip_hash' => $ipHash,
            'user_agent' => Str::limit((string) $request->userAgent(), 500, ''),
            'device_type' => $parsed['device_type'],
            'browser' => $parsed['browser'],
            'os' => $parsed['os'],
            'referrer' => Str::limit((string) $request->headers->get('referer'), 255, ''),
            'is_unique' => $isUnique,
        ]);

        $qrCode->increment('scans_total');
        if ($isUnique) {
            $qrCode->increment('unique_scans_total');
        }
        $qrCode->update(['last_scanned_at' => now()]);

        QrWallet::query()
            ->where('user_id', $qrCode->user_id)
            ->increment('scans_total');

        return $event;
    }

    private function hashIp(string $ip): string
    {
        return hash('sha256', $ip . '|' . (string) config('app.key'));
    }

    /**
     * @return array{device_type: string, browser: string, os: string}
     */
    private function parseUserAgent(string $ua): array
    {
        $uaLower = strtolower($ua);

        $device = str_contains($uaLower, 'mobile') || str_contains($uaLower, 'android') || str_contains($uaLower, 'iphone')
            ? 'mobile'
            : (str_contains($uaLower, 'tablet') || str_contains($uaLower, 'ipad') ? 'tablet' : 'desktop');

        $browser = match (true) {
            str_contains($uaLower, 'edg/') => 'Edge',
            str_contains($uaLower, 'chrome/') && ! str_contains($uaLower, 'edg/') => 'Chrome',
            str_contains($uaLower, 'safari/') && ! str_contains($uaLower, 'chrome/') => 'Safari',
            str_contains($uaLower, 'firefox/') => 'Firefox',
            default => 'Other',
        };

        $os = match (true) {
            str_contains($uaLower, 'iphone') || str_contains($uaLower, 'ipad') => 'iOS',
            str_contains($uaLower, 'android') => 'Android',
            str_contains($uaLower, 'windows') => 'Windows',
            str_contains($uaLower, 'mac os') || str_contains($uaLower, 'macintosh') => 'macOS',
            str_contains($uaLower, 'linux') => 'Linux',
            default => 'Other',
        };

        return [
            'device_type' => $device,
            'browser' => $browser,
            'os' => $os,
        ];
    }
}