feat: questionnaire management (Fasa 6)

- QuestionnaireSetController: full CRUD + publish/archive
- QuestionController: store, update, destroy, reorder
- ProgramQuestionnaireController: attach, confirm, detach
- Public/QuestionnaireController: show form, submit responses, double-submit guard
- Views: admin questionnaire CRUD, program questionnaire assign, public form + thankyou/already

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Http/Controllers/Admin/QuestionnaireSetController.php

@@ -3,63 +3,108 @@
 namespace App\Http\Controllers\Admin;
 
 use App\Http\Controllers\Controller;
+use App\Models\QuestionnaireSet;
 use Illuminate\Http\Request;
+use Illuminate\Http\RedirectResponse;
+use Illuminate\View\View;
 
 class QuestionnaireSetController extends Controller
 {
-    /**
-     * Display a listing of the resource.
-     */
-    public function index()
+    public function index(Request $request): View
     {
-        //
+        $query = QuestionnaireSet::withCount('questions')
+            ->with('creator')
+            ->latest();
+
+        if ($request->filled('q')) {
+            $query->where('title', 'like', '%' . $request->q . '%');
+        }
+
+        if ($request->filled('status')) {
+            $query->where('status', $request->status);
+        }
+
+        $sets = $query->paginate(20)->withQueryString();
+
+        return view('admin.questionnaires.index', compact('sets'));
     }
 
-    /**
-     * Show the form for creating a new resource.
-     */
-    public function create()
+    public function create(): View
     {
-        //
+        return view('admin.questionnaires.create');
     }
 
-    /**
-     * Store a newly created resource in storage.
-     */
-    public function store(Request $request)
+    public function store(Request $request): RedirectResponse
     {
-        //
+        $data = $request->validate([
+            'title'       => 'required|string|max:255',
+            'description' => 'nullable|string|max:1000',
+        ]);
+
+        $data['created_by'] = auth()->id();
+        $data['status']     = 'draft';
+
+        $set = QuestionnaireSet::create($data);
+
+        return redirect()->route('admin.questionnaires.show', $set)
+            ->with('success', 'Set soalselidik berjaya dicipta.');
     }
 
-    /**
-     * Display the specified resource.
-     */
-    public function show(string $id)
+    public function show(QuestionnaireSet $set): View
     {
-        //
+        $set->load(['questions', 'creator']);
+        $usedInPrograms = $set->programs()->get();
+
+        return view('admin.questionnaires.show', compact('set', 'usedInPrograms'));
     }
 
-    /**
-     * Show the form for editing the specified resource.
-     */
-    public function edit(string $id)
+    public function edit(QuestionnaireSet $set): View
     {
-        //
+        return view('admin.questionnaires.edit', compact('set'));
     }
 
-    /**
-     * Update the specified resource in storage.
-     */
-    public function update(Request $request, string $id)
+    public function update(Request $request, QuestionnaireSet $set): RedirectResponse
     {
-        //
+        $data = $request->validate([
+            'title'       => 'required|string|max:255',
+            'description' => 'nullable|string|max:1000',
+        ]);
+
+        $set->update($data);
+
+        return redirect()->route('admin.questionnaires.show', $set)
+            ->with('success', 'Set soalselidik berjaya dikemaskini.');
     }
 
-    /**
-     * Remove the specified resource from storage.
-     */
-    public function destroy(string $id)
+    public function destroy(QuestionnaireSet $set): RedirectResponse
     {
-        //
+        $confirmed = $set->programQuestionnaires()->where('is_confirmed', true)->exists();
+
+        if ($confirmed) {
+            return back()->with('error', 'Soalselidik ini tidak boleh dipadam kerana sudah disahkan untuk program.');
+        }
+
+        $set->delete();
+
+        return redirect()->route('admin.questionnaires.index')
+            ->with('success', 'Set soalselidik berjaya dipadam.');
+    }
+
+    public function publish(QuestionnaireSet $set): RedirectResponse
+    {
+        if ($set->questions()->count() === 0) {
+            return back()->with('error', 'Tambah sekurang-kurangnya satu soalan sebelum menerbitkan.');
+        }
+
+        $set->update(['status' => 'published']);
+
+        return back()->with('success', 'Set soalselidik diterbitkan.');
+    }
+
+    public function archive(QuestionnaireSet $set): RedirectResponse
+    {
+        $set->update(['status' => 'archived']);
+
+        return back()->with('success', 'Set soalselidik diarkibkan.');
     }
 }