src/Services/Catalog/Catalog.API/Model/CatalogItem.cs

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namespace Microsoft.eShopOnContainers.Services.Catalog.API.Model;

public class CatalogItem
{
    public int Id { get; set; }

    public string Name { get; set; }

    public string Description { get; set; }

    public decimal Price { get; set; }

    public string PictureFileName { get; set; }

    public string PictureUri { get; set; }

    public int CatalogTypeId { get; set; }

    public CatalogType CatalogType { get; set; }

    public int CatalogBrandId { get; set; }

    public CatalogBrand CatalogBrand { get; set; }

    // Quantity in stock
    public int AvailableStock { get; set; }

    // Available stock at which we should reorder
    public int RestockThreshold { get; set; }


    // Maximum number of units that can be in-stock at any time (due to physicial/logistical constraints in warehouses)
    public int MaxStockThreshold { get; set; }

    /// <summary>
    /// True if item is on reorder
    /// </summary>
    public bool OnReorder { get; set; }

    public CatalogItem() { }


    /// <summary>
    /// Decrements the quantity of a particular item in inventory and ensures the restockThreshold hasn't
    /// been breached. If so, a RestockRequest is generated in CheckThreshold. 
    /// 
    /// If there is sufficient stock of an item, then the integer returned at the end of this call should be the same as quantityDesired. 
    /// In the event that there is not sufficient stock available, the method will remove whatever stock is available and return that quantity to the client.
    /// In this case, it is the responsibility of the client to determine if the amount that is returned is the same as quantityDesired.
    /// It is invalid to pass in a negative number. 
    /// </summary>
    /// <param name="quantityDesired"></param>
    /// <returns>int: Returns the number actually removed from stock. </returns>
    /// 
    public int RemoveStock(int quantityDesired)
    {
        if (AvailableStock == 0)
        {
            throw new CatalogDomainException($"Empty stock, product item {Name} is sold out");
        }