<?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 string $lastSuccess = '';
    public bool   $installing  = false;
    public bool   $starting    = false;
    public int    $startSecs   = 0;

    private const STARTING_FLAG = '/tmp/mw-clamav-starting';

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

    private function restoreStartingState(): void
    {
        if (!file_exists(self::STARTING_FLAG)) return;
        if ($this->running) {
            @unlink(self::STARTING_FLAG);
            return;
        }
        $elapsed = time() - (int) @file_get_contents(self::STARTING_FLAG);
        if ($elapsed > 180) {
            @unlink(self::STARTING_FLAG);
            return;
        }
        $this->starting  = true;
        $this->startSecs = max(0, $elapsed);
    }

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

    public function install(): void
    {
        $this->installing = true;
        $out = [];
        @exec('sudo -n /usr/local/sbin/mailwolt-clamav install 2>&1', $out, $rc);
        $this->installing = false;
        if ($rc !== 0) {
            $this->lastError = implode(' ', $out) ?: 'Installation fehlgeschlagen.';
        } else {
            $this->dispatch('toast', type: 'success', badge: 'ClamAV',
                title: 'Installiert', text: 'ClamAV wurde installiert. Sie können ihn jetzt aktivieren.');
        }
        $this->refresh();
    }

    public function enable(): void
    {
        $this->lastError   = '';
        $this->lastSuccess = '';
        [$ok, $msg] = $this->runCmd('enable');
        if (!$ok) {
            $this->lastError = $msg;
            return;
        }
        file_put_contents(self::STARTING_FLAG, time());
        $this->enabled   = true;
        $this->starting  = true;
        $this->startSecs = 0;
    }

    public function pollStatus(): void
    {
        if (!$this->starting) return;
        $this->startSecs += 3;
        $this->running = $this->serviceActive();
        if ($this->running) {
            @unlink(self::STARTING_FLAG);
            $this->starting    = false;
            $this->startSecs   = 0;
            $this->enabled     = $this->serviceEnabled();
            $this->ramMb       = $this->readRamMb();
            $this->lastSuccess = 'ClamAV ist aktiv und läuft.';
        }
    }

    public function disable(): void
    {
        [$ok, $msg] = $this->runCmd('disable');
        if ($ok) $this->lastSuccess = 'ClamAV wurde gestoppt und deaktiviert.';
        else     $this->lastError   = $msg;
        $this->running = $this->serviceActive();
        $this->enabled = $this->serviceEnabled();
    }

    public function updateDb(): void
    {
        [$ok, $msg] = $this->runCmd('freshclam');
        if ($ok) $this->lastSuccess = 'Virensignaturen wurden aktualisiert.';
        else     $this->lastError   = $msg;
        [$this->dbDate, $this->dbVersion] = $this->readDbInfo();
    }

    private function runCmd(string $action): array
    {
        $out = []; $rc = null;
        exec('sudo -n /usr/local/sbin/mailwolt-clamav ' . escapeshellarg($action) . ' 2>&1', $out, $rc);
        \Log::info('ClamAV ' . $action, ['rc' => $rc, 'out' => $out]);
        $msg = implode(' ', $out) ?: 'Unbekannter Fehler (rc=' . $rc . ')';
        return [$rc === 0, $msg];
    }

    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');
    }
}