using Microsoft.EntityFrameworkCore.Metadata.Internal;
using ServiceStationContracts.BindingModels;
using ServiceStationContracts.ViewModels;
using ServiceStationDataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ServiceStationsDataBaseImplement.Models
{
	public class Work : IWorkModel {

		public int Id { get; set; }

		[Required]
		public DateTime Date { get; set; } = DateTime.Now;

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

		[ForeignKey("ExecutorId")]
		public int ExecutorId { get; set; }

		[ForeignKey("TaskId")]
		public int TaskId { get; set; }


		[ForeignKey("WorkId")]
		public virtual List<WorkClient> WorkClients { get; set; } = new();

		
		public Dictionary<int, IClientModel>? _clientList = null;

		[NotMapped]
		public Dictionary<int, IClientModel> ClientList {
			get {
				if (_clientList == null) {
					_clientList = WorkClients.ToDictionary(recWC => recWC.WorkId, recWC => recWC._client as IClientModel);	
				}
				return _clientList;
			}
		}

		public static Work? Create(Database context, WorkBindingModel? model) {
			if (model == null) {
				return null;
			}
			return new Work() {
				Id = model.Id,
				Date = model.Date,
				Price = model.Price,
				ExecutorId = model.ExecutorId,
				TaskId = model.TaskId,
				WorkClients = model.ClientList.Select(x => new WorkClient {
					_work = context.Works.First(y => y.Id == x.Key)
				}).ToList()
			};
		}

		public void Update(WorkBindingModel? model) {
			if (model == null) {
				return;
			}
			Price = model.Price;
		}

		public WorkViewModel GetViewModel => new() {
			Id = Id,
			Date = Date,
			Price = Price,
			ExecutorId = ExecutorId,
			TaskId = TaskId,
			ClientList = ClientList
		};

		public void UpdateClients(Database context, WorkBindingModel model) {
			var worckClients = context.WorksClients.Where(rec => rec.WorkId == model.Id).ToList();
			if (worckClients != null && worckClients.Count > 0) {
				// Нужно удалить те записи, которых нет в модели
				context.WorksClients.RemoveRange(worckClients.Where(rec => !model.ClientList.ContainsKey(rec.ClientId)));
				context.SaveChanges();
			}
			// получаем работу, добавляем новые записи
			var work = context.Works.First(x => x.Id == Id);
			foreach (var wc in model.ClientList) {
				context.WorksClients.Add(new WorkClient {
					_work = work,
					_client = context.Clients.First(x => x.Id == wc.Key)
				});
				context.SaveChanges();
			}
			_clientList = null;
		}

	}
}