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app/Http/Controllers/Api/WeightLogController.php

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+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Http\Resources\WeightLogResource;
+use App\Models\WeightLog;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+
+class WeightLogController extends Controller
+{
+    public function index(): JsonResponse
+    {
+        $logs = Auth::user()->weightLogs()->orderBy('logged_at')->get();
+
+        return response()->json(['data' => WeightLogResource::collection($logs)]);
+    }
+
+    public function store(Request $request): JsonResponse
+    {
+        $data = $request->validate([
+            'weight_kg' => ['required', 'numeric', 'min:20', 'max:400'],
+            'logged_at' => ['nullable', 'date', 'before_or_equal:today'],
+        ]);
+
+        $loggedAt = $data['logged_at'] ?? now()->toDateString();
+
+        $entry = WeightLog::where('user_id', Auth::id())->whereDate('logged_at', $loggedAt)->first()
+            ?? new WeightLog(['user_id' => Auth::id(), 'logged_at' => $loggedAt]);
+        $entry->weight_kg = $data['weight_kg'];
+        $entry->save();
+
+        return response()->json(['weight_log' => new WeightLogResource($entry)], 201);
+    }
+
+    public function destroy(WeightLog $weightLog): JsonResponse
+    {
+        if ($weightLog->user_id !== Auth::id()) {
+            abort(403);
+        }
+
+        $weightLog->delete();
+
+        return response()->json(['message' => __('app.weight_log.deleted')]);
+    }
+}