incr/app/Http/Controllers/Transactions/EntryController.php

<?php

declare(strict_types=1);

namespace App\Http\Controllers\Transactions;

use App\Http\Controllers\Controller;
use App\Models\Transactions\Entry;
use App\Models\User;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;

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

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

        return response()->json($tracker->entries()->orderBy('date', 'desc')->get());
    }

    public function store(Request $request): RedirectResponse
    {
        $validated = $request->validate([
            'date' => 'required|date|before_or_equal:today',
            'quantity' => 'required|numeric|min:0.000001',
            'unit_price' => 'nullable|numeric|min:0.01',
            'total_cost' => 'nullable|numeric|min:0.01',
        ]);

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

        if (! $tracker) {
            return back()->withErrors(['tracker' => 'No tracker found. Please complete onboarding first.']);
        }

        // If unit_price and total_cost provided, verify the calculation
        if (isset($validated['unit_price'], $validated['total_cost'])) {
            $calculatedTotal = $validated['quantity'] * $validated['unit_price'];
            if (abs($calculatedTotal - $validated['total_cost']) > 0.01) {
                return back()->withErrors([
                    'total_cost' => 'Total cost does not match quantity × unit price.',
                ]);
            }
        }

        $tracker->entries()->create($validated);

        return back()->with('success', 'Entry added successfully!');
    }

    public function summary(): JsonResponse
    {
        $tracker = User::default()->tracker;

        if (! $tracker) {
            return response()->json([
                'total_quantity' => 0,
                'total_cost' => 0,
                'average_cost_per_unit' => 0,
            ]);
        }

        return response()->json([
            'total_quantity' => Entry::totalQuantity($tracker->id),
            'total_cost' => Entry::totalCost($tracker->id),
            'average_cost_per_unit' => Entry::averageCostPerUnit($tracker->id),
        ]);
    }

    public function destroy(Entry $entry): JsonResponse
    {
        $tracker = User::default()->tracker;

        if (! $tracker || $entry->tracker_id !== $tracker->id) {
            return response()->json(['error' => 'Entry not found.'], 404);
        }

        $entry->delete();

        return response()->json([
            'success' => true,
            'message' => 'Entry deleted successfully!',
        ]);
    }
}