PhoneToolMX/PhoneToolMX.Models/ViewModels/ExtensionVM.cs

using PhoneToolMX.Data;
using System.ComponentModel.DataAnnotations;

namespace PhoneToolMX.Models.ViewModels
{
    public class ExtensionVM: IViewModel
    {

        public int? Id { get; set; }
        
        [Header("Ext.", Primary = true, Small = true)]
        public int ExtId { get; set; }

        [Header("Directory Name")]
        [Required]
        [MaxLength(15)]
        public string DirectoryName { get; set; }
        
        [Header("Listed?", Small = true)]
        [Required]
        public bool Listed { get; set; }

        public int? HoldMusic { get; set; }
        
        public IOwnedModel ToEntity(PTMXContext ctx)
        {
            return new Extension
            {
                Id = Id,
                ExtId = ExtId,
                DirectoryName = DirectoryName,
                Listed = Listed,
                HoldMusic = HoldMusic == null ? null : ctx.CustomData.FirstOrDefault(c => c.Id == HoldMusic),
                Owners = new List<User>(),
            };
        }
        public IOwnedModel ToEntity(PTMXContext ctx, IOwnedModel current)
        {
            var ent = ToEntity(ctx);
            ent.Owners = current.Owners;
            return ent;
        }
        
        public IViewModel FromEntity(IOwnedModel entity)
        {
            if (entity is not Extension extEnt) throw new ArgumentException("entity must be of type Extension");
            return new ExtensionVM
            {
                Id = extEnt.Id,
                ExtId = extEnt.ExtId,
                DirectoryName = extEnt.DirectoryName,
                Listed = extEnt.Listed,
                HoldMusic = extEnt.HoldMusic?.Id,
            };
        }
        // TODO: fix hack
        public string NotifyOnChange() => (ExtId == 0 ? Id + 1000 : ExtId).ToString();
    }
}