using Grand.Business.Core.Queries.Checkout.Orders;
using Grand.Domain.Payments;
using MediatR;

namespace Grand.Business.Checkout.Queries.Handlers.Orders
{
    public class CanPartiallyPaidOfflineQueryHandler : IRequestHandler<CanPartiallyPaidOfflineQuery, bool>
    {
        public Task<bool> Handle(CanPartiallyPaidOfflineQuery request, CancellationToken cancellationToken)
        {
            var paymentTransaction = request.PaymentTransaction;
            if (paymentTransaction == null)
                throw new ArgumentNullException(nameof(request.PaymentTransaction));

            var amountToPaid = request.AmountToPaid;

            if (paymentTransaction.TransactionAmount == 0)
                return Task.FromResult(false);

            var canBePaid = paymentTransaction.TransactionAmount - paymentTransaction.PaidAmount;
            if (canBePaid <= 0)
                return Task.FromResult(false);

            return amountToPaid > canBePaid ? Task.FromResult(false) : Task.FromResult(paymentTransaction.TransactionStatus is TransactionStatus.PartialPaid or TransactionStatus.Pending or TransactionStatus.PartiallyRefunded or TransactionStatus.Refunded);
        }
    }
}
