<?php

namespace App\Console\Commands;

use App\Models\BackupJob;
use Illuminate\Console\Command;

class RestoreRun extends Command
{
    protected $signature = 'restore:run {backupJobId : ID des Quell-Backups} {token : Statusdatei-Token}';
    protected $description = 'Stellt ein Backup wieder her und schreibt den Status in eine Temp-Datei';

    public function handle(): int
    {
        $sourceJob = BackupJob::find($this->argument('backupJobId'));
        $token     = $this->argument('token');
        $statusFile = sys_get_temp_dir() . '/' . $token . '.json';

        $artifact = $sourceJob?->artifact_path;

        if (!$artifact || !file_exists($artifact)) {
            $this->writeStatus($statusFile, 'failed', ['✗ Archivdatei nicht gefunden: ' . $artifact]);
            return self::FAILURE;
        }

        $this->writeStatus($statusFile, 'running', ['Archiv wird extrahiert…']);

        $extractDir = sys_get_temp_dir() . '/mailwolt_restore_' . $token;
        mkdir($extractDir, 0700, true);

        $log      = [];
        $exitCode = 0;

        // ── 1. Archiv extrahieren ─────────────────────────────────────────
        $tarOut  = [];
        $tarExit = 0;
        exec(
            "tar --ignore-failed-read -xzf " . escapeshellarg($artifact)
            . " -C " . escapeshellarg($extractDir) . " 2>&1",
            $tarOut, $tarExit
        );

        if ($tarExit > 1) {
            $log[]    = '✗ Extraktion fehlgeschlagen: ' . implode('; ', array_slice($tarOut, -3));
            $exitCode = 1;
        } else {
            $log[] = '✓ Archiv extrahiert';
        }
        $this->writeStatus($statusFile, 'running', $log);

        // ── 2. Datenbank ─────────────────────────────────────────────────
        $dbFiles = [];
        exec("find " . escapeshellarg($extractDir) . " -name 'database.sql' -type f 2>/dev/null", $dbFiles);

        if (!empty($dbFiles)) {
            $log[] = 'Datenbank wird importiert…';
            $this->writeStatus($statusFile, 'running', $log);

            [$ok, $msg] = $this->importDatabase($dbFiles[0]);
            $log[] = $ok ? '✓ Datenbank wiederhergestellt' : '✗ Datenbank: ' . $msg;
            if (!$ok) $exitCode = 1;
        } else {
            $log[] = '— Kein Datenbank-Dump im Archiv';
        }
        $this->writeStatus($statusFile, 'running', $log);

        // ── 3. E-Mails (Maildirs) ────────────────────────────────────────
        foreach (["{$extractDir}/var/mail", "{$extractDir}/var/vmail"] as $mailSrc) {
            if (is_dir($mailSrc)) {
                $log[] = 'E-Mails werden wiederhergestellt…';
                $this->writeStatus($statusFile, 'running', $log);

                $destParent = '/' . implode('/', array_slice(explode('/', $mailSrc, -1 + substr_count($mailSrc, '/')), 1, -1));
                $cpOut  = [];
                $cpExit = 0;
                exec("cp -rp " . escapeshellarg($mailSrc) . " " . escapeshellarg($destParent) . "/ 2>&1", $cpOut, $cpExit);
                $log[] = $cpExit === 0
                    ? '✓ E-Mails wiederhergestellt'
                    : '✗ Mails: ' . implode('; ', array_slice($cpOut, -3));
                if ($cpExit !== 0) $exitCode = 1;
            }
        }

        // ── 4. Konfiguration ─────────────────────────────────────────────
        $etcSrc = "{$extractDir}/etc";
        if (is_dir($etcSrc)) {
            $log[] = 'Konfiguration wird wiederhergestellt…';
            $this->writeStatus($statusFile, 'running', $log);

            foreach (scandir($etcSrc) ?: [] as $entry) {
                if ($entry === '.' || $entry === '..') continue;
                $cpOut  = [];
                $cpExit = 0;
                exec("cp -rp " . escapeshellarg("{$etcSrc}/{$entry}") . " /etc/ 2>&1", $cpOut, $cpExit);
                $log[] = $cpExit === 0
                    ? '✓ /etc/' . $entry
                    : '— /etc/' . $entry . ': ' . implode('; ', array_slice($cpOut, -1));
            }
        }

        // ── 5. Dienste neu laden ─────────────────────────────────────────
        foreach (['postfix', 'dovecot'] as $svc) {
            if (is_dir("{$etcSrc}/{$svc}")) {
                $restOut = [];
                exec("systemctl reload-or-restart {$svc} 2>&1", $restOut, $restExit);
                $log[] = $restExit === 0 ? '✓ ' . $svc . ' neu geladen' : '— ' . $svc . ': ' . implode('; ', $restOut);
            }
        }

        // ── Aufräumen ────────────────────────────────────────────────────
        exec("rm -rf " . escapeshellarg($extractDir));

        $finalStatus = $exitCode === 0 ? 'ok' : 'failed';
        $this->writeStatus($statusFile, $finalStatus, $log);

        return $exitCode === 0 ? self::SUCCESS : self::FAILURE;
    }

    private function importDatabase(string $sqlFile): array
    {
        $conn = config('database.connections.' . config('database.default'));
        if (($conn['driver'] ?? '') !== 'mysql') {
            return [false, 'Nur MySQL/MariaDB wird unterstützt.'];
        }

        $cmd = 'MYSQL_PWD=' . escapeshellarg($conn['password'] ?? '')
            . ' mysql'
            . ' -h ' . escapeshellarg($conn['host'] ?? '127.0.0.1')
            . ' -P ' . escapeshellarg((string)($conn['port'] ?? '3306'))
            . ' -u ' . escapeshellarg($conn['username'] ?? '')
            . ' '    . escapeshellarg($conn['database'] ?? '')
            . ' < '  . escapeshellarg($sqlFile)
            . ' 2>&1';

        $output = [];
        $exit   = 0;
        exec($cmd, $output, $exit);

        return $exit === 0
            ? [true, '']
            : [false, implode('; ', array_slice($output, -3))];
    }

    private function writeStatus(string $file, string $status, array $log): void
    {
        file_put_contents($file, json_encode([
            'status'    => $status,
            'log'       => implode("\n", $log),
            'timestamp' => time(),
        ]));
    }
}