using CarRepairShopContracts.BindingModels;
using CarRepairShopContracts.ViewModels;
using CarRepairShopDataModels.Models;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace CarRepairShopDatabaseImplement.Models
{
    public class Shop : IShopModel
    {
        public int Id { get; set; }

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

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

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

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

        private Dictionary<int, (IRepairModel, int)>? _shopRepairs = null;

        [NotMapped]
        public Dictionary<int, (IRepairModel, int)> ShopRepairs
        {
            get
            {
                if (_shopRepairs == null)
                {
                    _shopRepairs = Repairs
                            .ToDictionary(x => x.RepairId, x => (x.Repair as IRepairModel, x.Count));
                }
                return _shopRepairs;
            }
        }

        [ForeignKey("ShopId")]
        public virtual List<ShopRepair> Repairs { get; set; } = new();

        public static Shop Create(CarRepairShopDatabase context, ShopBindingModel model)
        {
            return new Shop()
            {
                Id = model.Id,
                ShopName = model.ShopName,
                Address = model.Address,
                DateOpening = model.DateOpening,
                RepairMaxAmount = model.RepairMaxAmount,
                Repairs = model.ShopRepairs.Select(x => new ShopRepair
                {
                    Repair = context.Repairs.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }

        public void Update(ShopBindingModel model)
        {
            ShopName = model.ShopName;
            Address = model.Address;
            DateOpening = model.DateOpening;
            RepairMaxAmount = model.RepairMaxAmount;
        }

        public ShopViewModel GetViewModel => new()
        {
            Id = Id,
            ShopName = ShopName,
            Address = Address,
            DateOpening = DateOpening,
            RepairMaxAmount = RepairMaxAmount,
            ShopRepairs = ShopRepairs
        };

        public void UpdateRepairs(CarRepairShopDatabase context, ShopBindingModel model)
        {
            var shopRepairs = context.ShopRepairs.Where(rec => rec.ShopId == model.Id).ToList();
            if (shopRepairs != null && shopRepairs.Count > 0)
            {
                context.ShopRepairs.RemoveRange(shopRepairs.Where(rec => !model.ShopRepairs.ContainsKey(rec.RepairId)));
                context.SaveChanges();
                foreach (var updateRepair in shopRepairs)
                {
                    if (model.ShopRepairs.ContainsKey(updateRepair.RepairId))
                    {
                        updateRepair.Count = model.ShopRepairs[updateRepair.RepairId].Item2;
                        model.ShopRepairs.Remove(updateRepair.RepairId);
                    }
                }
                context.SaveChanges();
            }
            var shop = context.Shops.First(x => x.Id == Id);
            foreach (var ic in model.ShopRepairs)
            {
                context.ShopRepairs.Add(new ShopRepair
                {
                    Shop = shop,
                    Repair = context.Repairs.First(x => x.Id == ic.Key),
                    Count = ic.Value.Item2
                });
                context.SaveChanges();
            }
            _shopRepairs = null;
        }
    }
}