<?php

declare(strict_types=1);

namespace App\Controllers;

use App\Services\Logging\LoggingService;
use App\Services\Logging\LogViewerService;

/**
 * Controller für den Log Viewer (read-only).
 */
class LogViewerController
{
    /** @var array<string, mixed> */
    private array $config;

    private LoggingService $logger;
    private LogViewerService $logViewer;

    /**
     * @param array<string, mixed> $config
     */
    public function __construct(array $config)
    {
        $this->config = $config;

        $loggingConfig = $config['logging'] ?? [];
        $this->logger = new LoggingService($loggingConfig);
        $this->logViewer = new LogViewerService($loggingConfig);
    }

    /**
     * Zeigt den Log Viewer an.
     *
     * Erwartet optionale GET-Parameter:
     * - file   (Dateiname, z.B. app.log)
     * - level  (DEBUG|INFO|WARNING|ERROR)
     * - q      (Suche)
     * - lines  (Anzahl Zeilen, Default 200)
     *
     * @return array<string, mixed>
     */
    public function show(): array
    {
        $files = $this->logViewer->listLogFiles();

        $selectedFile = (string)($_GET['file'] ?? '');
        if ($selectedFile === '' && isset($files[0]['name'])) {
            $selectedFile = (string)$files[0]['name'];
        }

        $level = (string)($_GET['level'] ?? '');
        $level = strtoupper(trim($level));
        if ($level === '') {
            $level = '';
        }

        $q = (string)($_GET['q'] ?? '');
        $q = trim($q);

        $lines = (int)($_GET['lines'] ?? 200);
        if ($lines <= 0) {
            $lines = 200;
        }
        if ($lines > 2000) {
            $lines = 2000;
        }

        $error = null;
        $fileMeta = null;
        $entries = [];

        try {
            if ($selectedFile !== '') {
                $fileMeta = $this->logViewer->getFileMeta($selectedFile);
                $entries = $this->logViewer->getEntries(
                    $selectedFile,
                    $lines,
                    $level !== '' ? $level : null,
                    $q !== '' ? $q : null
                );

                if ($fileMeta === null) {
                    $error = 'Die ausgewählte Log-Datei ist nicht verfügbar.';
                    $entries = [];
                }
            } else {
                $error = 'Es wurde keine Log-Datei gefunden.';
            }
        } catch (\Throwable $ex) {
            $this->logger->logException(
                'LogViewerController: Fehler beim Laden der Logs.',
                $ex,
                [
                    'route' => 'logs',
                    'file' => $selectedFile,
                ]
            );

            $error = 'Technischer Fehler beim Laden der Logs. Details stehen im app.log.';
        }

        $viewPath = __DIR__ . '/../../public/views/logs.php';

        return [
            'view' => $viewPath,
            'data' => [
                'loginPage' => false,
                'files' => $files,
                'selectedFile' => $selectedFile,
                'fileMeta' => $fileMeta,
                'entries' => $entries,
                'filterLevel' => $level,
                'searchQuery' => $q,
                'lines' => $lines,
                'error' => $error,
            ],
            'pageTitle' => 'Logs',
            'activeMenu' => 'logs',
        ];
    }
}