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app/Http/Controllers/Api/ExerciseAliasController.php

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+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Models\Exercise;
+use App\Models\ExerciseAlias;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+
+class ExerciseAliasController extends Controller
+{
+    public function store(Request $request, Exercise $exercise): JsonResponse
+    {
+        $data = $request->validate([
+            'name' => ['nullable', 'string', 'max:255'],
+        ]);
+
+        $name = trim((string) ($data['name'] ?? ''));
+        $userId = Auth::id();
+
+        if ($name === '') {
+            ExerciseAlias::where('user_id', $userId)->where('exercise_id', $exercise->id)->delete();
+
+            return response()->json(['message' => __('app.exercises.rename_cleared'), 'name' => null]);
+        }
+
+        ExerciseAlias::updateOrCreate(
+            ['user_id' => $userId, 'exercise_id' => $exercise->id],
+            ['name' => $name]
+        );
+
+        return response()->json(['message' => __('app.exercises.renamed_success'), 'name' => $name]);
+    }
+}