using CMSMicroservice.Protobuf.Protos.Inventory;

namespace BackOffice.BFF.Application.InventoryCQ.Commands.AdjustStock;

public class AdjustStockCommandHandler : IRequestHandler<AdjustStockCommand, AdjustStockResponseDto>
{
    private readonly IApplicationContractContext _context;

    public AdjustStockCommandHandler(IApplicationContractContext context)
    {
        _context = context;
    }

    public async Task<AdjustStockResponseDto> Handle(AdjustStockCommand request, CancellationToken cancellationToken)
    {
        var protoRequest = new AdjustStockRequest
        {
            ProductId = request.ProductId,
            ProductType = (ProductType)request.ProductType,
            NewQuantity = request.NewQuantity
        };

        if (!string.IsNullOrWhiteSpace(request.Reason))
            protoRequest.Reason = request.Reason;

        if (!string.IsNullOrWhiteSpace(request.ReferenceNumber))
            protoRequest.ReferenceNumber = request.ReferenceNumber;

        var response = await _context.Inventory.AdjustStockAsync(protoRequest, cancellationToken: cancellationToken);

        return new AdjustStockResponseDto
        {
            PreviousQuantity = response.PreviousQuantity,
            NewQuantity = response.NewQuantity,
            Difference = response.Difference
        };
    }
}