using LawFirmContracts.BindingModels;
using LawFirmContracts.ViewModels;
using LawFirmDataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LawFirmDatabaseImplement.Models
{
    public class Shop : IShopModel
    {
        public int Id { get; set; }
        [Required]
        public string Name { get; set; } = string.Empty;

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

        [Required]
        public DateTime OpeningDate { get; set; }

        [ForeignKey("ShopId")]
        public List<ShopDocument> Documents { get; set; } = new();

        private Dictionary<int, (IDocumentModel, int)>? _shopDocuments = null;

        [NotMapped]
        public Dictionary<int, (IDocumentModel, int)> ShopDocuments
        {
            get
            {
                if (_shopDocuments == null)
                {
                    _shopDocuments = Documents.ToDictionary(recPC => recPC.DocumentId, recPC => (recPC.Document as IDocumentModel, recPC.Count));
                }
                return _shopDocuments;
            }
        }

        [Required]
        public int MaxCountDocuments { get; set; }

        public static Shop Create(LawFirmDatabase context, ShopBindingModel model)
        {
            return new Shop()
            {
                Id = model.Id,
                Name = model.Name,
                Adress = model.Adress,
                OpeningDate = model.OpeningDate,
                Documents = model.ShopDocuments.Select(x => new ShopDocument
                {
                    Document = context.Documents.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList(),
                MaxCountDocuments = model.MaxCountDocuments
            };
        }

        public void Update(ShopBindingModel model)
        {
            Name = model.Name;
            Adress = model.Adress;
            OpeningDate = model.OpeningDate;
            MaxCountDocuments = model.MaxCountDocuments;
        }

        public ShopViewModel GetViewModel => new()
        {
            Id = Id,
            Name = Name,
            Adress = Adress,
            OpeningDate = OpeningDate,
            ShopDocuments = ShopDocuments,
            MaxCountDocuments = MaxCountDocuments
        };

        public void UpdateDocuments(LawFirmDatabase context, ShopBindingModel model)
        {
            var ShopDocuments = context.ShopDocuments.Where(rec => rec.ShopId == model.Id).ToList();
            if (ShopDocuments != null && ShopDocuments.Count > 0)
            {
                // удалили те, которых нет в модели
                context.ShopDocuments.RemoveRange(ShopDocuments.Where(rec => !model.ShopDocuments.ContainsKey(rec.DocumentId)));
                context.SaveChanges();
                ShopDocuments = context.ShopDocuments.Where(rec => rec.ShopId == model.Id).ToList();
                // обновили количество у существующих записей
                foreach (var updateDoc in ShopDocuments)
                {
                    updateDoc.Count = model.ShopDocuments[updateDoc.DocumentId].Item2;
                    model.ShopDocuments.Remove(updateDoc.DocumentId);
                }
                context.SaveChanges();
            }
            var shop = context.Shops.First(x => x.Id == Id);
            foreach (var elem in model.ShopDocuments)
            {
                context.ShopDocuments.Add(new ShopDocument
                {
                    Shop = shop,
                    Document = context.Documents.First(x => x.Id == elem.Key),
                    Count = elem.Value.Item2
                });
                context.SaveChanges();
            }
            _shopDocuments = null;
        }
    }
}