ERP_Distribution/Distribution/Models/SchemeRedemption.cs

using System.ComponentModel.DataAnnotations.Schema;

namespace Distribution.Models
{
    public class SchemeRedemption
    {
        public Guid Id { get; set; } = Guid.NewGuid();

        public Guid FK_SchemeId { get; set; }
        [ForeignKey("FK_SchemeId")]
        public Scheme Scheme { get; set; }

        public Guid? FK_ShopPOId { get; set; }
        [ForeignKey("FK_ShopPOId")]
        public ShopPO? ShopPO { get; set; }

        /// <summary>Placeholder for the future field-invoice module — no FieldInvoice entity exists yet.</summary>
        public Guid? FieldInvoiceId { get; set; }

        public decimal? DiscountAmount { get; set; }

        public Guid? FK_FreeItemId { get; set; }
        [ForeignKey("FK_FreeItemId")]
        public Item? FreeItem { get; set; }

        public decimal? FreeQty { get; set; }

        /// <summary>
        /// Cost price of the free item snapshotted at redemption time, so getSchemeROI stays
        /// accurate even after the item's cost price later changes.
        /// </summary>
        public decimal? FreeItemCostValue { get; set; }

        public DateTime RedeemedAt { get; set; } = DateTime.Now;
    }
}