PIbd-21_Kurs_Work_Hotel/Hotel/HotelDataBaseImplement/Models/MealPlan.cs

using HotelContracts.BindingModels;
using HotelContracts.ViewModels;
using HotelDataModels.Models;
using Npgsql.PostgresTypes;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Globalization;

namespace HotelDataBaseImplement.Models
{
	public class MealPlan : IMealPlanModel
	{
		public int Id { get; private set; }

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

		[Required]
		public double MealPlanPrice { get; set; }

		public int OrganiserId { get; private set; }

		public virtual Organiser Organiser { get; set; }

		private Dictionary<int, IParticipantModel> _mealPlanParticipants = null;

		[ForeignKey("MealPlanId")]
		public virtual List<MealPlanParticipant> Participants { get; set; } = new();

		[ForeignKey("MealPlanId")]
		public virtual List<MealPlanRoom> Rooms { get; set; } = new();

		[NotMapped]
		public Dictionary<int, IParticipantModel> MealPlanParticipants
		{
			get
			{
				if( _mealPlanParticipants == null )
				{
					using var contex = new HotelDataBase();
					_mealPlanParticipants = Participants.ToDictionary(x => x.ParticipantId, x => (contex.Participants
														.FirstOrDefault(y => y.Id == x.ParticipantId)! as IParticipantModel));
				}
				return _mealPlanParticipants;
			}
		}

		public static MealPlan Create(HotelDataBase context, MealPlanBindingModel model)
		{
			return new MealPlan()
			{
				Id = model.Id,
				MealPlanName = model.MealPlanName,
				MealPlanPrice = model.MealPlanPrice,
				OrganiserId = model.OrganiserId,
				Participants = model.MealPlanParticipants.Select(x => new MealPlanParticipant
				{
					Participant = context.Participants.First(y => y.Id == x.Key),
				}).ToList()
			};
		}

		public void Update(MealPlanBindingModel model)
		{
			MealPlanName = model.MealPlanName;
			MealPlanPrice = model.MealPlanPrice;
			OrganiserId = model.OrganiserId;
		}

		public MealPlanViewModel GetViewModel => new()
		{
			Id = Id,
			MealPlanName = MealPlanName,
			MealPlanPrice = MealPlanPrice,
			OrganiserId = OrganiserId,
			MealPlanParticipants = MealPlanParticipants
		};

		public void UpdateParticipants(HotelDataBase context, MealPlanBindingModel model)
		{
			var mealPlanParticipants = context.MealPlanParticipants.Where(rec => rec.MealPlanId == model.Id).ToList();

			if (mealPlanParticipants != null && mealPlanParticipants.Count > 0)
			{
				context.MealPlanParticipants.RemoveRange(mealPlanParticipants.Where(rec => !model.MealPlanParticipants.ContainsKey(rec.ParticipantId)));
				context.SaveChanges();

				foreach (var updateMember in mealPlanParticipants)
				{
					model.MealPlanParticipants.Remove(updateMember.ParticipantId);
				}
				context.SaveChanges();
			}

			var mealPlan = context.MealPlans.First(x => x.Id == Id);

			foreach (var cm in model.MealPlanParticipants)
			{
				context.MealPlanParticipants.Add(new MealPlanParticipant
				{
					MealPlan = mealPlan,
					Participant = context.Participants.First(x => x.Id == cm.Key)
				});
				context.SaveChanges();
			}
			_mealPlanParticipants = null;
		}
	}
}