<?php

namespace App\Livewire\Ui\Security;

use Livewire\Attributes\Layout;
use Livewire\Attributes\Title;
use Livewire\Component;

#[Layout('layouts.dvx')]
#[Title('Virenschutz · Mailwolt')]
class ClamavManager extends Component
{
    public bool   $installed  = false;
    public bool   $running    = false;
    public bool   $enabled    = false;
    public string $dbDate     = '—';
    public string $dbVersion  = '—';
    public ?int   $ramMb      = null;
    public string $lastError  = '';

    public function mount(): void
    {
        $this->refresh();
    }

    public function refresh(): void
    {
        $this->lastError = '';
        $this->installed = $this->isInstalled();
        $this->running   = $this->installed && $this->serviceActive();
        $this->enabled   = $this->installed && $this->serviceEnabled();
        $this->ramMb     = $this->running ? $this->readRamMb() : null;
        [$this->dbDate, $this->dbVersion] = $this->readDbInfo();
    }

    public function enable(): void
    {
        if (!$this->installed) {
            $this->lastError = 'ClamAV ist nicht installiert.';
            return;
        }
        $out = [];
        @exec('sudo -n /usr/local/sbin/mailwolt-clamav enable 2>&1', $out, $rc);
        if ($rc !== 0) {
            $this->lastError = implode(' ', $out) ?: 'Fehler beim Aktivieren.';
        } else {
            $this->dispatch('toast', type: 'success', badge: 'ClamAV',
                title: 'Aktiviert', text: 'ClamAV läuft jetzt und startet automatisch beim Booten.');
        }
        $this->refresh();
    }

    public function disable(): void
    {
        $out = [];
        @exec('sudo -n /usr/local/sbin/mailwolt-clamav disable 2>&1', $out, $rc);
        if ($rc !== 0) {
            $this->lastError = implode(' ', $out) ?: 'Fehler beim Deaktivieren.';
        } else {
            $this->dispatch('toast', type: 'success', badge: 'ClamAV',
                title: 'Deaktiviert', text: 'ClamAV wurde gestoppt und aus dem Autostart entfernt.');
        }
        $this->refresh();
    }

    public function updateDb(): void
    {
        $out = [];
        @exec('sudo -n /usr/local/sbin/mailwolt-clamav freshclam 2>&1', $out, $rc);
        if ($rc !== 0) {
            $this->lastError = implode(' ', $out) ?: 'Fehler beim Aktualisieren.';
        } else {
            $this->dispatch('toast', type: 'success', badge: 'ClamAV',
                title: 'Datenbank aktualisiert', text: 'Virensignaturen wurden aktualisiert.');
        }
        $this->refresh();
    }

    private function isInstalled(): bool
    {
        return is_executable('/usr/bin/clamscan') || is_executable('/usr/sbin/clamd')
            || @file_exists('/usr/sbin/clamd') || @file_exists('/usr/bin/clamdscan');
    }

    private function serviceActive(): bool
    {
        $exit = null;
        @exec('systemctl is-active --quiet clamav-daemon 2>/dev/null', $_, $exit);
        return $exit === 0;
    }

    private function serviceEnabled(): bool
    {
        $exit = null;
        @exec('systemctl is-enabled --quiet clamav-daemon 2>/dev/null', $_, $exit);
        return $exit === 0;
    }

    private function readRamMb(): ?int
    {
        $out = [];
        @exec("ps -C clamd -o rss= 2>/dev/null", $out);
        $kb = array_sum(array_map('intval', array_filter($out)));
        return $kb > 0 ? (int) round($kb / 1024) : null;
    }

    private function readDbInfo(): array
    {
        $paths = [
            '/var/lib/clamav/main.cvd',
            '/var/lib/clamav/main.cld',
            '/var/lib/clamav/daily.cvd',
            '/var/lib/clamav/daily.cld',
        ];
        $latest = 0;
        foreach ($paths as $p) {
            if (@file_exists($p)) {
                $mtime = @filemtime($p);
                if ($mtime > $latest) $latest = $mtime;
            }
        }
        if ($latest === 0) return ['—', '—'];
        $date = date('d.m.Y H:i', $latest);

        $ver = '—';
        $out = [];
        @exec('sigtool --info /var/lib/clamav/daily.cld 2>/dev/null | grep "^Version:" | head -1', $out);
        if (empty($out)) {
            @exec('sigtool --info /var/lib/clamav/daily.cvd 2>/dev/null | grep "^Version:" | head -1', $out);
        }
        if (!empty($out[0])) {
            $ver = trim(str_replace('Version:', '', $out[0]));
        }

        return [$date, $ver];
    }

    public function render()
    {
        return view('livewire.ui.security.clamav-manager');
    }
}