using AircraftPlantContracts.BindingModels;
using AircraftPlantContracts.ViewModels;
using AircraftPlantDataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;

namespace AircraftPlantDatabaseImplement.Models
{
    /// <summary>
    /// Сущность "Магазин"
    /// </summary>
    public class Shop : IShopModel
    {
        /// <summary>
        /// Идентификатор
        /// </summary>
        public int Id { get; set; }

        /// <summary>
        /// Название магазина
        /// </summary>
        [Required]
        public string ShopName { get; set; } = string.Empty;

        /// <summary>
        /// Адрес магазина
        /// </summary>
        [Required]
        public string Address { get; set; } = string.Empty;

        /// <summary>
        /// Дата открытия магазина
        /// </summary>
        [Required]
        public DateTime DateOpening { get; set; }

        /// <summary>
        /// Коллекция изделий в магазине
        /// </summary>
        private Dictionary<int, (IPlaneModel, int)>? _shopPlanes = null;

        [NotMapped]
        public Dictionary<int, (IPlaneModel, int)> ShopPlanes
        {
            get
            {
                if (_shopPlanes == null)
                {
                    _shopPlanes = Planes
                        .ToDictionary(recSP => recSP.PlaneId, recSP => (recSP.Plane as IPlaneModel, recSP.Count));
                }
                return _shopPlanes;
            }
        }

        /// <summary>
        /// Максимальное количество изделий
        /// </summary>
        public int MaxPlanes { get; set; }

        /// <summary>
        /// Связь с классом связи магазина и изделий
        /// </summary>
        [ForeignKey("ShopId")]
        public List<ShopPlane> Planes { get; set; } = new();

        /// <summary>
        /// Создание модели магазина
        /// </summary>
        /// <param name="context"></param>
        /// <param name="model"></param>
        /// <returns></returns>
        public static Shop Create(AircraftPlantDatabase context, ShopBindingModel model)
        {
            return new Shop
            {
                Id = model.Id,
                ShopName = model.ShopName,
                Address = model.Address,
                DateOpening = model.DateOpening,
                MaxPlanes = model.MaxPlanes,
                Planes = model.ShopPlanes.Select(x => new ShopPlane
                {
                    Plane = context.Planes.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }

        /// <summary>
        /// Изменение модели магазина
        /// </summary>
        /// <param name="model"></param>
        public void Update(ShopBindingModel model)
        {
            ShopName = model.ShopName;
            Address = model.Address;
            DateOpening = model.DateOpening;
            MaxPlanes = model.MaxPlanes;
        }

        /// <summary>
        /// Получение модели магазина
        /// </summary>
        public ShopViewModel GetViewModel => new()
        {
            Id = Id,
            ShopName = ShopName,
            Address = Address,
            DateOpening = DateOpening,
            ShopPlanes = ShopPlanes,
            MaxPlanes = MaxPlanes
        };

        /// <summary>
        /// Метод обновления списка связей
        /// </summary>
        /// <param name="context"></param>
        /// <param name="model"></param>
        public void UpdatePlanes(AircraftPlantDatabase context, ShopBindingModel model)
        {
            var shopPlanes = context.ShopPlanes.Where(rec => rec.ShopId == model.Id).ToList();
            if (shopPlanes != null && shopPlanes.Count > 0)
            {
                // Удаление изделий, которых нет в магазине
                context.ShopPlanes.RemoveRange(shopPlanes.Where(rec => !model.ShopPlanes.ContainsKey(rec.PlaneId)));
                context.SaveChanges();
                // Обновление количества у существующих записей
                foreach (var updatePlanes in shopPlanes)
                {
                    updatePlanes.Count = model.ShopPlanes[updatePlanes.PlaneId].Item2;
                    model.ShopPlanes.Remove(updatePlanes.PlaneId);
                }
                context.SaveChanges();
            }

            var shop = context.Shops.First(x => x.Id == Id);
            foreach (var sp in model.ShopPlanes)
            {
                context.ShopPlanes.Add(new ShopPlane
                {
                    Shop = shop,
                    Plane = context.Planes.First(x => x.Id == sp.Key),
                    Count = sp.Value.Item2
                });
                context.SaveChanges();
            }
            _shopPlanes = null;
        }
    }
}