using LawCompanyDataModels.Models;
using LawCompanyContracts.BindingModels;
using LawCompanyContracts.ViewModels;
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;

namespace LawCompanyDatabaseImplement.Models
{
	public class Visit : IVisitModel
	{
		public int Id { get; private set; }
		[Required]
		public DateTime VisitDate { get; private set; }

		//связь один-к-одному
		public int? HearingId { get; private set; }
		public Hearing Hearing { get; set; } = null!;
		//---
		public int ExecutorId { get; set; }

		private Dictionary<int, IClientModel>? _visitClients = null;

		[NotMapped]
		public Dictionary<int, IClientModel> VisitClients
		{
			get
			{

				if (_visitClients == null)
				{
					_visitClients = Clients.ToDictionary(x => x.ClientId, x => (x.Client as IClientModel));
				}
				return _visitClients;
			}
		}

		[ForeignKey("VisitId")]
		public virtual List<VisitClient> Clients { get; set; } = new();

		public static Visit Create(LawCompanyDatabase context, VisitBindingModel model)
		{
			return new Visit()
			{
				Id = model.Id,
				VisitDate = model.VisitDate,
				HearingId = model.HearingId,
				ExecutorId = model.ExecutorId,
				Clients = model.VisitClients.Select(x => new VisitClient
				{
					Client = context.Clients.First(y => y.Id == x.Key)
				}).ToList()
			};
		}

		public void Update(VisitBindingModel model)
		{
			VisitDate = model.VisitDate;
			HearingId = model.HearingId;
		}

		public VisitViewModel GetViewModel => new()
		{
			Id = Id,
			VisitDate = VisitDate,
			HearingId = HearingId,
			ExecutorId = ExecutorId,
		};

		public void UpdateClients(LawCompanyDatabase context, VisitBindingModel model)
		{
			var visitClients = context.VisitClients.Where(rec => rec.VisitId == model.Id).ToList();

			if (visitClients != null && visitClients.Count > 0)
			{ // удалили те, которых нет в модели
				context.VisitClients.RemoveRange(visitClients.Where(rec => !model.VisitClients.ContainsKey(rec.ClientId)));
				context.SaveChanges();

				foreach (var updateLunch in visitClients)
				{
					model.VisitClients.Remove(updateLunch.ClientId);
				}
				context.SaveChanges();
			}

			var _visit = context.Visits.First(x => x.Id == Id);

			foreach (var pc in model.VisitClients)
			{
				context.VisitClients.Add(new VisitClient
				{
					Visit = _visit,
					Client = context.Clients.First(x => x.Id == pc.Key),
				});
				context.SaveChanges();
			}
			_visitClients = null;
		}
	}
}