fuel-price/app/Http/Controllers/Api/UserController.php

<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Validation\Rule;

final class UserController extends Controller
{
    public function preferences(Request $request): JsonResponse
    {
        return response()->json([
            'preferred_fuel_type' => $request->user()->preferred_fuel_type,
            'postcode' => $request->user()->postcode,
        ]);
    }

    public function updatePreferences(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'preferred_fuel_type' => ['sometimes', Rule::in(['petrol', 'diesel', 'e5', 'b7_premium', 'b10', 'hvo'])],
            'postcode' => ['sometimes', 'string', 'max:8'],
        ]);

        $request->user()->update($validated);

        return response()->json([
            'preferred_fuel_type' => $request->user()->fresh()->preferred_fuel_type,
            'postcode' => $request->user()->fresh()->postcode,
        ]);
    }

    public function savedStations(Request $request): JsonResponse
    {
        $stations = $request->user()->savedStations()->get();

        return response()->json(['data' => $stations]);
    }

    public function saveStation(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'station_id' => ['required', 'string', 'max:64'],
        ]);

        $request->user()->savedStations()->firstOrCreate([
            'station_id' => $validated['station_id'],
        ]);

        return response()->json(null, 201);
    }

    public function removeStation(Request $request, string $stationId): Response
    {
        $request->user()->savedStations()->where('station_id', $stationId)->delete();

        return response()->noContent();
    }
}