88 lines
4.1 KiB
C#
88 lines
4.1 KiB
C#
namespace Netina.Core.EntityServices.DiscountHandlers;
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public class CalculateOrderDiscountCommandHandler : IRequestHandler<CalculateOrderDiscountCommand , double>
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{
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private readonly IRepositoryWrapper _repositoryWrapper;
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private readonly ICurrentUserService _currentUserService;
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public CalculateOrderDiscountCommandHandler(IRepositoryWrapper repositoryWrapper,ICurrentUserService currentUserService)
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{
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_repositoryWrapper = repositoryWrapper;
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_currentUserService = currentUserService;
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}
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public async Task<double> Handle(CalculateOrderDiscountCommand request, CancellationToken cancellationToken)
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{
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if (request.Order == null)
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throw new AppException("Order is null", ApiResultStatusCode.BadRequest);
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var discount = await _repositoryWrapper.SetRepository<Discount>()
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.TableNoTracking
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.FirstOrDefaultAsync(d => d.Code == request.DiscountCode, cancellationToken);
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if (discount == null)
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throw new AppException("تخفیف وجود منقضی شده است یا وجود ندارد", ApiResultStatusCode.NotFound);
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if (_currentUserService.UserId != null && Guid.TryParse(_currentUserService.UserId, out Guid userId))
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{
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var discountedUserOrder = await _repositoryWrapper.SetRepository<Order>()
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.TableNoTracking
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.FirstOrDefaultAsync(f => f.CustomerId == userId && f.DiscountCode == discount.Code, cancellationToken);
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if (discountedUserOrder != null)
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throw new AppException("شما یک بار از این کد تخفیف استفاده کرده اید", ApiResultStatusCode.BadRequest);
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}
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if (discount.IsForFirstPurchase)
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{
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if (_currentUserService.UserId != null && Guid.TryParse(_currentUserService.UserId, out Guid firstPurchaseUserId))
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{
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var userOrderCount = await _repositoryWrapper.SetRepository<Order>()
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.TableNoTracking
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.CountAsync(f => f.CustomerId == firstPurchaseUserId && f.DiscountCode == discount.Code, cancellationToken);
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if (userOrderCount > 0)
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throw new AppException("شما قبلا خریدی داشته اید و نمیتوانید از تخفیف اولین خرید استفاده کنید", ApiResultStatusCode.BadRequest);
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}
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}
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double discountPrice = 0;
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double totalPrice = 0;
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if (discount.Type == DiscountType.All)
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{
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if (!discount.IsExpired())
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{
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totalPrice = request.Order.OrderProducts.Sum(op => op.ProductCost);
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}
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}
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else if (discount.Type == DiscountType.Category)
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{
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var categoryDiscount = await _repositoryWrapper.SetRepository<CategoryDiscount>()
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.TableNoTracking
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.FirstOrDefaultAsync(d => d.Code == request.DiscountCode, cancellationToken);
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if ( categoryDiscount!=null && !categoryDiscount.IsExpired())
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{
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totalPrice = request.Order.OrderProducts.Where(op => op.ProductCategoryId == categoryDiscount.CategoryId).Sum(op => op.ProductCost);
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}
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}
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else if (discount.Type == DiscountType.Product)
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{
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var productDiscount = await _repositoryWrapper.SetRepository<ProductDiscount>()
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.TableNoTracking
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.FirstOrDefaultAsync(d => d.Code == request.DiscountCode, cancellationToken);
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if (productDiscount != null && !productDiscount.IsExpired())
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{
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totalPrice = request.Order.OrderProducts.Where(op => op.ProductId == productDiscount!.ProductId).Sum(op => op.ProductCost);
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}
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}
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else if (discount.Type == DiscountType.Subscriber)
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{
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throw new NotImplementedException("Subscribe discount not implemented");
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}
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discountPrice = discount.AmountType == DiscountAmountType.Amount
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? discount.DiscountAmount
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: ((totalPrice / 100) * discount.DiscountPercent);
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return discountPrice;
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}
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} |