<?php

namespace App\Traits\Purchase;

use App\Models\Bottle;
use App\Models\Perfume;
use App\Models\Product;

trait WithUpdateStock
{
    public function increaseOutletStock($outlet, $item)
    {
        $quantity = $item->quantity;

        switch ($item->purchasable_type) {
            case Perfume::class:
                $relation = 'perfumes';
                break;
            case Product::class:
                $relation = 'products';
                break;
            case Bottle::class:
                $relation = 'bottles';
                break;
            default:
                return;
        }

        $existing = $outlet->{$relation}()
            ->where("{$relation}.id", $item->purchasable_id)
            ->first();

        if ($existing) {
            $currentStock = $existing->pivot->stock ?? 0;
            $outlet->{$relation}()->updateExistingPivot($item->purchasable_id, [
                'stock' => $currentStock + $quantity,
            ]);
        } else {
            $outlet->{$relation}()->attach($item->purchasable_id, [
                'stock' => $quantity,
            ]);
        }
    }
}