<?php

namespace App\Traits\StockTransfer;

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

trait WithStockTransferStock
{
    public function transferStockBetweenOutlets($sourceOutlet, $destinationOutlet, $item): void
    {
        $quantity = $item->quantity;

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

        // Decrease source outlet stock
        $sourceItem = $sourceOutlet->{$relation}()
            ->where("{$relation}.id", $item->transferable_id)
            ->lockForUpdate()
            ->withPivot('stock')
            ->first();

        $sourcePreviousStock = 0;

        if ($sourceItem) {
            $sourcePreviousStock = $sourceItem->pivot->stock ?? 0;
        }

        if ($sourcePreviousStock < $quantity) {
            throw new \Exception("Stok {$item->transferable->name} di outlet asal tidak mencukupi. Tersisa {$sourcePreviousStock}, diminta {$quantity}.");
        }

        $sourceNewStock = $sourcePreviousStock - $quantity;

        $sourceOutlet->{$relation}()->updateExistingPivot($item->transferable_id, [
            'stock' => $sourceNewStock,
        ]);

        // Increase destination outlet stock
        $destinationItem = $destinationOutlet->{$relation}()
            ->where("{$relation}.id", $item->transferable_id)
            ->lockForUpdate()
            ->withPivot('stock')
            ->first();

        if ($destinationItem) {
            $destinationPreviousStock = $destinationItem->pivot->stock ?? 0;
            $destinationOutlet->{$relation}()->updateExistingPivot($item->transferable_id, [
                'stock' => $destinationPreviousStock + $quantity,
            ]);
        } else {
            $destinationPreviousStock = 0;
            $destinationOutlet->{$relation}()->attach($item->transferable_id, [
                'stock' => $quantity,
            ]);
        }
        $destinationNewStock = $destinationPreviousStock + $quantity;

        $stockTransfer = $item->stockTransfer ?? StockTransfer::find($item->stock_transfer_id);

        if ($stockTransfer) {
            StockActivityLogService::transfer(
                stockTransfer: $stockTransfer,
                product: $item->transferable,
                quantity: $quantity,
                sourcePreviousStock: $sourcePreviousStock,
                sourceNewStock: $sourceNewStock,
                destinationPreviousStock: $destinationPreviousStock,
                destinationNewStock: $destinationNewStock
            );
        }
    }

    public function reverseStockTransferBetweenOutlets($sourceOutlet, $destinationOutlet, $item): void
    {
        $quantity = $item->quantity;

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

        // Return items to source outlet
        $sourcePivot = $sourceOutlet->{$relation}()
            ->where("{$relation}.id", $item->transferable_id)
            ->first();

        $currentSourceStock = $sourcePivot?->pivot?->stock ?? 0;
        $newSourceStock = $currentSourceStock + $quantity;

        if ($sourcePivot) {
            $sourceOutlet->{$relation}()->updateExistingPivot($item->transferable_id, [
                'stock' => $newSourceStock,
            ]);
        } else {
            $sourceOutlet->{$relation}()->attach($item->transferable_id, [
                'stock' => $quantity,
            ]);
        }

        $stockTransfer = $item->stockTransfer ?? StockTransfer::find($item->stock_transfer_id);

        if ($stockTransfer) {
            StockActivityLogService::logOutlet(
                logName: StockActivityLogService::LOG_TRANSFER,
                event: 'increase',
                description: "Stock Transfer #{$stockTransfer->hash_id} Deleted: Returned {$quantity} stock to source outlet.",
                performedOn: $item->transferable,
                outlet: $sourceOutlet,
                quantityChange: $quantity,
                previousStock: $currentSourceStock,
                newStock: $newSourceStock,
                extraProperties: ['stock_transfer_id' => $stockTransfer->id]
            );
        }

        // Remove items from destination outlet
        $destinationPivot = $destinationOutlet->{$relation}()
            ->where("{$relation}.id", $item->transferable_id)
            ->first();

        $currentDestinationStock = $destinationPivot?->pivot?->stock ?? 0;
        $newDestinationStock = max(0, $currentDestinationStock - $quantity);

        if ($destinationPivot) {
            $destinationOutlet->{$relation}()->updateExistingPivot($item->transferable_id, [
                'stock' => $newDestinationStock,
            ]);
        }

        if ($stockTransfer) {
            StockActivityLogService::logOutlet(
                logName: StockActivityLogService::LOG_TRANSFER,
                event: 'decrease',
                description: "Stock Transfer #{$stockTransfer->hash_id} Deleted: Removed {$quantity} stock from destination outlet.",
                performedOn: $item->transferable,
                outlet: $destinationOutlet,
                quantityChange: -1 * abs($quantity),
                previousStock: $currentDestinationStock,
                newStock: $newDestinationStock,
                extraProperties: ['stock_transfer_id' => $stockTransfer->id]
            );
        }
    }
}