<?php

namespace App\Traits\Purchase;

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

trait WithUpdateStock
{
    public function increaseWarehouseStock($warehouse, $item): void
    {
        $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;
        }

        // Lock the row to prevent race conditions
        $existing = $warehouse->{$relation}()
            ->where("{$relation}.id", $item->purchasable_id)
            ->lockForUpdate()
            ->withPivot('stock')
            ->first();

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

        StockActivityLogService::logWarehouse(
            logName: 'Belanja',
            event: 'Menambah',
            description: 'Stok '.$item->purchasable->name.' di '.$warehouse->name.' bertambah '.formatCurrencyNumber($quantity),
            performedOn: $item->purchasable,
            warehouse: $warehouse,
            quantityChange: $quantity,
            previousStock: $previousStock,
            newStock: $previousStock + $quantity,
            extraProperties: [
                'purchasable_id' => $item->purchasable_id,
                'purchasable_type' => $item->purchasable_type,
                'purchase_id' => $item->purchase_id ?? null,
            ]
        );
    }

    public function decreaseWarehouseStock($warehouse, $item): void
    {
        $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 = $warehouse->{$relation}()
            ->where("{$relation}.id", $item->purchasable_id)
            ->lockForUpdate()
            ->withPivot('stock')
            ->first();

        $currentStock = $existing?->pivot->stock ?? 0;
        $newStock = max(0, $currentStock - $quantity);

        if ($existing) {
            if ($newStock === 0) {
                $warehouse->{$relation}()->detach($item->purchasable_id);
            } else {
                $warehouse->{$relation}()->updateExistingPivot(
                    $item->purchasable_id,
                    ['stock' => $newStock]
                );
            }
        }

        StockActivityLogService::logWarehouse(
            logName: 'Belanja',
            event: 'Mengurangi',
            description: 'Stok '.$item->purchasable->name.' di '.$warehouse->name.' berkurang '.$quantity,
            performedOn: $item->purchasable,
            warehouse: $warehouse,
            quantityChange: $quantity,
            previousStock: $currentStock,
            newStock: $newStock,
            extraProperties: [
                'purchasable_id' => $item->purchasable_id,
                'purchasable_type' => $item->purchasable_type,
                'purchase_id' => $item->purchase_id,
            ]
        );
    }
}