feat: Fragen-Export (JSON) und -Import im Admin-Bereich

app/Http/Controllers/Admin/QuestionController.php

@@ -5,6 +5,7 @@ use App\Models\Question;
 use App\Models\Subject;
 use App\Models\AnswerOption;
 use Illuminate\Http\Request;
+use Illuminate\Support\Facades\DB;
 class QuestionController extends Controller {
     public function index(Request $r) {
         $subjects  = Subject::all();
@@ -97,4 +98,64 @@ class QuestionController extends Controller {
         $question->delete();
         return redirect()->route('admin.questions.index')->with('success','Frage gelöscht.');
     }
+
+    public function export(Request $r) {
+        $query = Question::with(['subject','answerOptions'])->latest();
+        if ($r->filled('subject')) $query->where('subject_id', $r->subject);
+        $data = $query->get()->map(fn($q) => [
+            'subject'       => $q->subject->slug,
+            'question_text' => $q->question_text,
+            'type'          => $q->type,
+            'difficulty'    => $q->difficulty,
+            'points_value'  => $q->points_value,
+            'active'        => (bool)$q->active,
+            'options'       => $q->answerOptions->map(fn($o) => [
+                'text'       => $o->text,
+                'is_correct' => (bool)$o->is_correct,
+            ])->values(),
+        ]);
+        $filename = 'fragen-' . now()->format('Y-m-d') . '.json';
+        return response()->streamDownload(
+            fn() => print(json_encode($data, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE)),
+            $filename,
+            ['Content-Type' => 'application/json']
+        );
+    }
+
+    public function import(Request $r) {
+        $r->validate(['file' => 'required|file|mimes:json|max:2048']);
+        $raw = json_decode(file_get_contents($r->file('file')->getRealPath()), true);
+        if (!is_array($raw)) {
+            return back()->with('error', 'Ungültiges JSON-Format.');
+        }
+        $subjects = Subject::pluck('id','slug');
+        $imported = 0;
+        $skipped  = 0;
+        DB::transaction(function() use ($raw, $subjects, &$imported, &$skipped) {
+            foreach ($raw as $item) {
+                if (empty($item['subject']) || !isset($subjects[$item['subject']])) { $skipped++; continue; }
+                if (empty($item['question_text']))                                  { $skipped++; continue; }
+                $q = Question::create([
+                    'subject_id'    => $subjects[$item['subject']],
+                    'question_text' => $item['question_text'],
+                    'type'          => $item['type'] ?? 'multiple_choice',
+                    'difficulty'    => $item['difficulty'] ?? 1,
+                    'points_value'  => $item['points_value'] ?? 5,
+                    'active'        => $item['active'] ?? true,
+                ]);
+                foreach (($item['options'] ?? []) as $i => $opt) {
+                    AnswerOption::create([
+                        'question_id' => $q->id,
+                        'text'        => $opt['text'],
+                        'is_correct'  => $opt['is_correct'] ?? false,
+                        'sort_order'  => $i,
+                    ]);
+                }
+                $imported++;
+            }
+        });
+        $msg = "{$imported} Fragen importiert.";
+        if ($skipped) $msg .= " {$skipped} übersprungen (unbekanntes Fach oder fehlender Text).";
+        return back()->with('success', $msg);
+    }
 }

resources/views/admin/questions/index.blade.php

@@ -1,7 +1,7 @@
 @extends('layouts.admin')
 @section('title','Fragen')
 @section('content')
-<div class="flex flex-wrap gap-3 items-center justify-between mb-6">
+<div class="flex flex-wrap gap-3 items-center justify-between mb-6" x-data="{showImport:false}">
   <form method="GET" class="flex gap-2">
     <select name="subject" class="border border-slate-300 rounded-lg px-3 py-2 text-sm">
       <option value="">Alle Fächer</option>
@@ -9,8 +9,36 @@
     </select>
     <button class="bg-slate-700 text-white px-4 py-2 rounded-lg text-sm">Filtern</button>
   </form>
+  <div class="flex gap-2 flex-wrap">
+    {{-- Export --}}
+    <a href="{{ route('admin.questions.export', request()->only('subject')) }}"
+       class="flex items-center gap-1.5 bg-slate-100 hover:bg-slate-200 text-slate-700 px-4 py-2 rounded-lg text-sm font-medium">
+      ⬇ Export JSON
+    </a>
+    {{-- Import trigger --}}
+    <button @click="showImport=!showImport"
+            class="flex items-center gap-1.5 bg-slate-100 hover:bg-slate-200 text-slate-700 px-4 py-2 rounded-lg text-sm font-medium">
+      ⬆ Import JSON
+    </button>
     <a href="{{ route('admin.questions.create') }}" class="bg-violet-600 hover:bg-violet-700 text-white px-4 py-2 rounded-lg text-sm font-medium">+ Neue Frage</a>
   </div>
+
+  {{-- Import panel --}}
+  <div x-show="showImport" x-cloak class="w-full mt-1">
+    <div class="bg-amber-50 border border-amber-200 rounded-xl p-5">
+      <h3 class="font-semibold text-slate-800 mb-1">Fragen importieren</h3>
+      <p class="text-xs text-slate-500 mb-3">JSON-Datei im gleichen Format wie der Export. Bestehende Fragen bleiben erhalten.</p>
+      <form method="POST" action="{{ route('admin.questions.import') }}" enctype="multipart/form-data" class="flex items-center gap-3">
+        @csrf
+        <input type="file" name="file" accept=".json" required
+               class="flex-1 text-sm text-slate-600 file:mr-3 file:py-1.5 file:px-3 file:rounded-lg file:border-0 file:text-sm file:font-medium file:bg-violet-100 file:text-violet-700 hover:file:bg-violet-200">
+        <button type="submit" class="bg-violet-600 hover:bg-violet-700 text-white px-4 py-2 rounded-lg text-sm font-medium whitespace-nowrap">
+          Importieren
+        </button>
+      </form>
+    </div>
+  </div>
+</div>
 <div class="bg-white rounded-xl shadow-sm border border-slate-200 overflow-hidden">
   <table class="w-full text-sm">
     <thead class="bg-slate-50 border-b border-slate-200">

routes/web.php

@@ -17,6 +17,8 @@ Route::middleware(['auth','admin'])->prefix('admin')->name('admin.')->group(func
     Route::get('/', [Admin\DashboardController::class, 'index'])->name('dashboard');
     Route::resource('users',    Admin\UserController::class);
     Route::post('users/{user}/reset', [Admin\UserController::class, 'reset'])->name('users.reset');
+    Route::get ('questions/export', [Admin\QuestionController::class,'export'])->name('questions.export');
+    Route::post('questions/import', [Admin\QuestionController::class,'import'])->name('questions.import');
     Route::resource('questions',Admin\QuestionController::class);
     Route::resource('rewards',  Admin\RewardController::class)->except('show');
     Route::get   ('redemptions',                          [Admin\RedemptionController::class,'index'])  ->name('redemptions.index');