using ComputerShopContracts.BindingModels;
using ComputerShopDataModels.Models;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace ComputerShopDatabaseImplement.Models
{
	public class Assembly : IAssemblyModel
	{
		public int Id { get; private set; }

		[Required]
		public int UserId { get; private set; }

		[Required]
		public string AssemblyName { get; private set; } = string.Empty;

		[Required]
		public double Cost { get; private set; }

		[Required]
		public string Category { get; private set; } = string.Empty;

		[ForeignKey("ComponentId")]
		public virtual List<AssemblyComponent> Components { get; set; } = new();

		private Dictionary<int, (IComponentModel, int)>? _assemblyComponents;

		[NotMapped]
		public Dictionary<int, (IComponentModel, int)> AssemblyComponents
		{
			get
			{
				if (_assemblyComponents == null)
				{
					_assemblyComponents = Components.ToDictionary(
						AsmComp => AsmComp.ComponentId, 
						AsmComp => (AsmComp.Component as IComponentModel, AsmComp.Count)
					);
				}

				return _assemblyComponents;
			}
		}

		public static Assembly Create(ComputerShopDatabase Context, AssemblyBindingModel Model)
		{
			return new()
			{
				Id = Model.Id,
				UserId = Model.UserId,
				AssemblyName = Model.AssemblyName,
				Cost = Model.Cost,
				Category = Model.Category,
				Components = Model.AssemblyComponents.Select(x => new AssemblyComponent
				{
					Component = Context.Components.First(y => y.Id == x.Key),
					Count = x.Value.Item2
				}).ToList(),
			};
		}

		// TODO: Update(), ViewModel, UpdateComponents()
	}
}