incr/app/Http/Controllers/TrackerController.php

<?php

declare(strict_types=1);

namespace App\Http\Controllers;

use App\Models\Asset;
use App\Models\User;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;

class TrackerController extends Controller
{
    public function show(): JsonResponse
    {
        $tracker = User::default()->tracker;

        if (! $tracker) {
            return response()->json(null);
        }

        return response()->json($tracker->load('asset'));
    }

    public function store(Request $request): RedirectResponse|JsonResponse
    {
        $validated = $request->validate([
            'label' => 'required|string|max:255',
            'unit' => 'required|string|max:50',
            'price_tracking_enabled' => 'boolean',
            'symbol' => 'nullable|string|max:10',
            'full_name' => 'nullable|string|max:255',
        ]);

        $user = User::default();

        if ($user->tracker) {
            return response()->json(['error' => 'Tracker already exists.'], 409);
        }

        $assetId = null;
        if (! empty($validated['symbol'])) {
            $asset = Asset::findOrCreateBySymbol($validated['symbol'], $validated['full_name'] ?? null);
            $assetId = $asset->id;
        }

        $user->tracker()->create([
            'label' => $validated['label'],
            'unit' => $validated['unit'],
            'price_tracking_enabled' => $validated['price_tracking_enabled'] ?? false,
            'asset_id' => $assetId,
        ]);

        return back();
    }

    public function update(Request $request): RedirectResponse|JsonResponse
    {
        $validated = $request->validate([
            'label' => 'sometimes|string|max:255',
            'unit' => 'sometimes|string|max:50',
            'price_tracking_enabled' => 'sometimes|boolean',
            'symbol' => 'nullable|string|max:10',
            'full_name' => 'nullable|string|max:255',
        ]);

        $tracker = User::default()->tracker;

        if (! $tracker) {
            return response()->json(['error' => 'No tracker found.'], 404);
        }

        if (array_key_exists('symbol', $validated)) {
            if ($validated['symbol']) {
                $asset = Asset::findOrCreateBySymbol($validated['symbol'], $validated['full_name'] ?? null);
                $tracker->asset_id = $asset->id;
            } else {
                $tracker->asset_id = null;
            }
        }

        $update = [];
        if (isset($validated['label'])) {
            $update['label'] = $validated['label'];
        }
        if (isset($validated['unit'])) {
            $update['unit'] = $validated['unit'];
        }
        if (array_key_exists('price_tracking_enabled', $validated)) {
            $update['price_tracking_enabled'] = $validated['price_tracking_enabled'];
        }
        if (array_key_exists('symbol', $validated)) {
            $update['asset_id'] = $tracker->asset_id;
        }

        $tracker->update($update);

        return back();
    }
}