using System.ComponentModel.DataAnnotations.Schema;

namespace Distribution.Models
{
    public class Order : Template
    {
        public Guid? FK_SaleId { get; set; }
        [ForeignKey("FK_SaleId")]
        public Sale? Sale { get; set; }

        public Guid CreatedByUserId { get; set; }
        [ForeignKey("CreatedByUserId")]
        public User CreatedByUser { get; set; }

        /// <summary>Set once an Invoice is created for this PO (either mode). No DB-level FK
        /// constraint — configured explicitly in Fluent API per order_invoice_lifecycle.md.</summary>
        public Guid? InvoiceId { get; set; }

        public DateTime OrderDate { get; set; }
        public Guid FK_StoreId { get; set; }
        [ForeignKey("FK_StoreId")]
        public Store Store { get; set; }
        public decimal TotalAmount { get; set; }
        public OrderStatus Status { get; set; } = OrderStatus.Pending;
        public DateTime? FulfilledAt { get; set; }

        /// <summary>Null = Shop PO (items editable). Set = Confirmed PO (items locked). Not modeled
        /// as an explicit field in order_invoice_lifecycle.md's diagram, but required to implement
        /// its Business Rule 1 (item edits gated on confirmation) independent of Invoice existing —
        /// Mode B confirms a PO with no Invoice at all.</summary>
        public DateTime? ConfirmedAt { get; set; }
        public Guid? ConfirmedByUserId { get; set; }
        [ForeignKey("ConfirmedByUserId")]
        public User? ConfirmedByUser { get; set; }

        public ICollection<OrderItem> OrderItems { get; set; } = new List<OrderItem>();
    }
}