<?php

declare(strict_types=1);

namespace App\Framework\Process\Services;

use App\Framework\Process\Process;
use App\Framework\Process\ValueObjects\Command;

/**
 * Systemd Service.
 *
 * Verwaltet Systemd-Services über systemctl.
 */
final readonly class SystemdService
{
    public function __construct(
        private Process $process
    ) {
    }

    /**
     * Listet alle Services.
     *
     * @return array<string, array{name: string, status: string, active: bool}>
     */
    public function listServices(bool $all = false): array
    {
        $command = Command::fromArray([
            'systemctl',
            'list-units',
            '--type=service',
            '--no-pager',
            '--no-legend',
        ]);

        if ($all) {
            $command = Command::fromArray([
                'systemctl',
                'list-units',
                '--type=service',
                '--all',
                '--no-pager',
                '--no-legend',
            ]);
        }

        $result = $this->process->run($command);

        if (! $result->isSuccess()) {
            return [];
        }

        $services = [];
        $lines = explode("\n", trim($result->stdout));

        foreach ($lines as $line) {
            if (empty(trim($line))) {
                continue;
            }

            $parts = preg_split('/\s+/', $line, 6);
            if (count($parts) < 5) {
                continue;
            }

            $name = $parts[0];
            $status = $parts[3] ?? 'unknown';
            $active = ($parts[3] ?? '') === 'active';

            $services[] = [
                'name' => $name,
                'status' => $status,
                'active' => $active,
            ];
        }

        return $services;
    }

    /**
     * Gibt den Status eines Services zurück.
     */
    public function getServiceStatus(string $service): ?array
    {
        $command = Command::fromArray([
            'systemctl',
            'status',
            $service,
            '--no-pager',
        ]);

        $result = $this->process->run($command);

        if (! $result->isSuccess()) {
            return null;
        }

        // Parse status output
        $lines = explode("\n", $result->stdout);
        $status = [
            'name' => $service,
            'active' => false,
            'enabled' => false,
        ];

        foreach ($lines as $line) {
            if (strpos($line, 'Active:') !== false) {
                $status['active'] = strpos($line, 'active') !== false;
            }
            if (strpos($line, 'Loaded:') !== false) {
                $status['enabled'] = strpos($line, 'enabled') !== false;
            }
        }

        return $status;
    }

    /**
     * Startet einen Service.
     */
    public function startService(string $service): bool
    {
        $result = $this->process->run(
            Command::fromArray(['systemctl', 'start', $service])
        );

        return $result->isSuccess();
    }

    /**
     * Stoppt einen Service.
     */
    public function stopService(string $service): bool
    {
        $result = $this->process->run(
            Command::fromArray(['systemctl', 'stop', $service])
        );

        return $result->isSuccess();
    }

    /**
     * Startet einen Service neu.
     */
    public function restartService(string $service): bool
    {
        $result = $this->process->run(
            Command::fromArray(['systemctl', 'restart', $service])
        );

        return $result->isSuccess();
    }

    /**
     * Aktiviert einen Service.
     */
    public function enableService(string $service): bool
    {
        $result = $this->process->run(
            Command::fromArray(['systemctl', 'enable', $service])
        );

        return $result->isSuccess();
    }

    /**
     * Deaktiviert einen Service.
     */
    public function disableService(string $service): bool
    {
        $result = $this->process->run(
            Command::fromArray(['systemctl', 'disable', $service])
        );

        return $result->isSuccess();
    }

    /**
     * Gibt fehlgeschlagene Services zurück.
     *
     * @return array<string>
     */
    public function getFailedServices(): array
    {
        $command = Command::fromArray([
            'systemctl',
            'list-units',
            '--type=service',
            '--state=failed',
            '--no-pager',
            '--no-legend',
        ]);

        $result = $this->process->run($command);

        if (! $result->isSuccess()) {
            return [];
        }

        $failed = [];
        $lines = explode("\n", trim($result->stdout));

        foreach ($lines as $line) {
            if (empty(trim($line))) {
                continue;
            }

            $parts = preg_split('/\s+/', $line);
            if (! empty($parts[0])) {
                $failed[] = $parts[0];
            }
        }

        return $failed;
    }
}