using Grand.Business.Core.Commands.Checkout.Orders;
using Grand.Business.Core.Interfaces.Catalog.Products;
using Grand.Business.Core.Interfaces.Checkout.Orders;
using Grand.Business.Core.Interfaces.Checkout.Shipping;
using Grand.Domain.Orders;
using Grand.Domain.Shipping;
using MediatR;

namespace Grand.Business.Checkout.Commands.Handlers.Orders;

public class CancelOrderItemCommandHandler : IRequestHandler<CancelOrderItemCommand, (bool error, string message)>
{
    private readonly IInventoryManageService _inventoryManageService;
    private readonly IMediator _mediator;
    private readonly IOrderService _orderService;
    private readonly IProductService _productService;
    private readonly IShipmentService _shipmentService;

    public CancelOrderItemCommandHandler(
        IMediator mediator,
        IOrderService orderService,
        IShipmentService shipmentService,
        IProductService productService,
        IInventoryManageService inventoryManageService)
    {
        _mediator = mediator;
        _orderService = orderService;
        _shipmentService = shipmentService;
        _productService = productService;
        _inventoryManageService = inventoryManageService;
    }

    public async Task<(bool error, string message)> Handle(CancelOrderItemCommand request,
        CancellationToken cancellationToken)
    {
        if (request.Order == null)
            throw new ArgumentNullException(nameof(request.Order));

        if (request.OrderItem == null)
            throw new ArgumentNullException(nameof(request.OrderItem));

        var product = await _productService.GetProductById(request.OrderItem.ProductId);
        if (product == null)
            return (true, "Product not exists.");

        if (request.OrderItem.OpenQty == 0 || request.OrderItem.Status == OrderItemStatus.Close)
            return (true, "You can't cancel this order item.");
        if (product.IsGiftVoucher) return (true, "You can't cancel gift voucher, please delete it.");

        //add a note
        await _orderService.InsertOrderNote(new OrderNote {
            Note = $"Order item has been canceled - {product.Name} - Qty: {request.OrderItem.OpenQty}",
            DisplayToCustomer = false,
            OrderId = request.Order.Id
        });

        await _inventoryManageService.AdjustReserved(product, request.OrderItem.OpenQty, request.OrderItem.Attributes,
            request.OrderItem.WarehouseId);

        request.OrderItem.CancelQty = request.OrderItem.OpenQty;
        request.OrderItem.CancelAmount =
            Math.Round(request.OrderItem.UnitPriceInclTax / request.OrderItem.CancelQty, 2);
        request.OrderItem.OpenQty = 0;
        request.OrderItem.Status = OrderItemStatus.Close;

        if (request.Order.ShippingStatusId == ShippingStatus.PartiallyShipped)
        {
            var shipments = await _shipmentService.GetShipmentsByOrder(request.Order.Id);
            if (!request.Order.HasItemsToAddToShipment() && shipments.All(x => x.ShippedDateUtc != null))
                request.Order.ShippingStatusId = ShippingStatus.Shipped;
            if (!request.Order.HasItemsToAddToShipment() && shipments.All(x => x.DeliveryDateUtc != null))
                request.Order.ShippingStatusId = ShippingStatus.Delivered;
        }

        await _orderService.UpdateOrder(request.Order);

        //check order status
        await _mediator.Send(new CheckOrderStatusCommand { Order = request.Order }, cancellationToken);

        return (false, "");
    }
}