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<?php

namespace Corals\Modules\Inventory\Observers;

use Corals\Modules\Inventory\Classes\Scopes\InventoryItemScope;
use Corals\Modules\Inventory\Models\InventoryItem;
use Corals\Modules\Inventory\Models\Transaction;

class TransactionObserver
{

    /**
     * @param Transaction $transaction
     */
    public function created(Transaction $transaction)
    {
        $this->handleTransactionCreateUpdate($transaction);
    }

    public function updated(Transaction $transaction)
    {
        $this->handleTransactionCreateUpdate($transaction);
    }

    public function deleted(Transaction $transaction)
    {
        $this->handleTransactionCreateUpdate($transaction);
    }


    protected function handleTransactionCreateUpdate(Transaction $transaction)
    {
        $inTotal = Transaction::inDirection();

        (new InventoryItemScope())->apply($inTotal, $transaction->inventory_id, $transaction->item_id);

        $inTotal = $inTotal->sum('quantity');

        $outTotal = Transaction::outDirection();

        (new InventoryItemScope())->apply($outTotal, $transaction->inventory_id, $transaction->item_id);

        $outTotal = $outTotal->sum('quantity');

        $result = $inTotal - $outTotal;

        $query = InventoryItem::query();

        (new InventoryItemScope())->apply($query, $transaction->inventory_id, $transaction->item_id);

        $query->update(['inventory_value' => $result]);
    }
}