using System.ComponentModel.DataAnnotations.Schema;

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

        public Guid FK_ItemId { get; set; }
        [ForeignKey("FK_ItemId")]
        public Item Item { get; set; }

        public Guid? FromLocationId { get; set; }
        public LocationType? FromLocationType { get; set; }

        public Guid? ToLocationId { get; set; }
        public LocationType? ToLocationType { get; set; }

        /// <summary>Null for items that don't track batches/expiry — no behavior change for existing items.</summary>
        public Guid? FK_ItemBatchId { get; set; }
        [ForeignKey("FK_ItemBatchId")]
        public ItemBatch? ItemBatch { get; set; }

        /// <summary>Null for items that don't track serial numbers. Quantity is always 1 when set.</summary>
        public Guid? FK_ItemSerialNumberId { get; set; }
        [ForeignKey("FK_ItemSerialNumberId")]
        public ItemSerialNumber? ItemSerialNumber { get; set; }

        public decimal Quantity { get; set; }
        public MovementType Type { get; set; }

        public string? ReasonCode { get; set; }
        public Guid? ReferenceId { get; set; }

        public DateTime CreatedAt { get; set; } = DateTime.Now;
        public Guid CreatedBy { get; set; }
    }
}