BackOffice.BFF/src/BackOffice.BFF.Application/InventoryCQ/Queries/GetLowStockItems/GetLowStockItemsQueryHandler.cs

using BackOffice.BFF.Application.InventoryCQ.Queries.GetAllInventoryItems;
using CMSMicroservice.Protobuf.Protos.Inventory;

namespace BackOffice.BFF.Application.InventoryCQ.Queries.GetLowStockItems;

public class GetLowStockItemsQueryHandler : IRequestHandler<GetLowStockItemsQuery, GetLowStockItemsResponseDto>
{
    private readonly IApplicationContractContext _context;

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

    public async Task<GetLowStockItemsResponseDto> Handle(GetLowStockItemsQuery request, CancellationToken cancellationToken)
    {
        var protoRequest = new GetLowStockItemsRequest
        {
            Page = request.Page,
            PageSize = request.PageSize
        };

        if (request.WarehouseId.HasValue)
            protoRequest.WarehouseId = request.WarehouseId.Value;
        
        if (request.ProductType.HasValue)
            protoRequest.ProductType = (ProductType)request.ProductType.Value;

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

        return new GetLowStockItemsResponseDto
        {
            TotalCount = response.TotalCount,
            Items = response.Items.Select(i => new GetAllInventoryItems.InventoryItemDto
            {
                Id = i.Id,
                ProductId = i.ProductId,
                DiscountProductId = i.DiscountProductId,
                ProductType = (int)i.ProductType,
                ProductTitle = i.ProductTitle,
                ProductPrice = i.ProductPrice,
                Quantity = i.Quantity,
                ReservedQuantity = i.ReservedQuantity,
                AvailableQuantity = i.AvailableQuantity,
                LowStockThreshold = i.LowStockThreshold,
                ReorderPoint = i.ReorderPoint,
                MaxStockLevel = i.MaxStockLevel,
                WarehouseId = i.WarehouseId,
                WarehouseName = i.WarehouseName,
                IsLowStock = true
            }).ToList()
        };
    }
}