using GiftShopContracts.BindingModels;
using GiftShopContracts.ViewModels;
using GiftShopDataModels.Models;
using System.Xml.Linq;

namespace GiftShopFileImplement.Models
{
    public class Shop : IShopModel
    {
        public int Id { get; set; }
        public string ShopName { get; private set; }
        public string ShopAdress { get; private set; }
        public DateTime OpeningDate { get; private set; }
        public Dictionary<int, int> Gifts { get; private set; } = new();

        private Dictionary<int, (IGiftModel, int)>? _shopGifts = null;
        public Dictionary<int, (IGiftModel, int)> ShopGifts
        {
            get
            {
                if (_shopGifts == null)
                {
                    var source = DataFileSingleton.GetInstance();
                    _shopGifts = Gifts.ToDictionary(x => x.Key, y =>
                    ((source.Gifts.FirstOrDefault(z => z.Id == y.Key) as IGiftModel)!,
                    y.Value));
                }
                return _shopGifts;
            }
        }

        public int MaxCapacity { get; private set; }

        public static Shop? Create(ShopBindingModel model)
        {
            if (model == null)
                return null;
            return new Shop()
            {
                Id = model.Id,
                ShopName = model.ShopName,
                ShopAdress = model.ShopAdress,
                OpeningDate = model.OpeningDate,
                MaxCapacity = model.MaxCapacity,
                Gifts = model.ShopGifts.ToDictionary(x => x.Key, x => x.Value.Item2)
            };
        }

        public static Shop? Create(XElement element)
        {
            if (element == null)
            {
                return null;
            }
            return new Shop()
            {
                Id = Convert.ToInt32(element.Attribute("Id")!.Value),
                ShopName = element.Element("ShopName")!.Value,
                ShopAdress = element.Element("ShopAdress")!.Value,
                MaxCapacity = Convert.ToInt32(element.Element("MaxCapacity")!.Value),
                OpeningDate = Convert.ToDateTime(element.Element("OpeningDate")!.Value),
                Gifts = element.Element("ShopGifts")!.Elements("ShopGifts").ToDictionary(x =>Convert.ToInt32(x.Element("Key")?.Value), x =>Convert.ToInt32(x.Element("Value")?.Value))
            };
        }


        public void Update(ShopBindingModel model)
        {
            if (model == null)
            {
                return;
            }
            ShopName = model.ShopName;
            ShopAdress = model.ShopAdress;
            OpeningDate = model.OpeningDate;
            MaxCapacity = model.MaxCapacity;
            if (model.ShopGifts.Count > 0)
            {
                Gifts = model.ShopGifts.ToDictionary(x => x.Key, x => x.Value.Item2);
                _shopGifts = null;
            }
        }

        public ShopViewModel GetViewModel => new()
        {
            Id = Id,
            ShopName = ShopName,
            ShopAdress = ShopAdress,
            OpeningDate = OpeningDate,
            MaxCapacity = MaxCapacity,
            ShopGifts = ShopGifts
        };

        public XElement GetXElement => new("Shop",
             new XAttribute("Id", Id),
             new XElement("ShopName", ShopName),
             new XElement("ShopAdress", ShopAdress),
             new XElement("OpeningDate", OpeningDate),
             new XElement("MaxCapacity", MaxCapacity),
             new XElement("Gifts", Gifts.Select(x => new XElement("Gifts",
                     new XElement("Key", x.Key),
                     new XElement("Value", x.Value))).ToArray()));
    }
}