using ComputersShopContracts.BindingModels;
using ComputersShopContracts.ViewModels;
using ComputersShopDataModels.Models;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace ComputersShopFileImplements.Models
{
    public class Shop: IShopModel
    {
        public int Id { get; set; }
        public string ShopName { get; set;}
        public string Address { get; set;}
        public DateTime DateOpen { get; set;}
        public int MaxCount { get; set;}
        public Dictionary<int, int> Computers { get; private set; } = new();
        private Dictionary<int, (IComputerModel, int)>? _shopComputers = null;
        public Dictionary<int, (IComputerModel, int)> ShopComputers
        {
            get
            {
                if (_shopComputers == null)
                {
                    var source = DataFileSingleton.GetInstance();
                    _shopComputers = Computers.ToDictionary(x => x.Key, y => ((source.Computers.FirstOrDefault(z => z.Id == y.Key) as IComputerModel)!, y.Value));
                }
                return _shopComputers;
            }
        }
        public static Shop? Create(ShopBindingModel model)
        {
            if (model == null)
            {
                return null;
            }
            return new Shop()
            {
                Id = model.Id,
                ShopName = model.ShopName,
                Address = model.Address,
                MaxCount = model.MaxCount,
                DateOpen = model.DateOpen,
                Computers = model.ShopComputers.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),
                MaxCount = Convert.ToInt32(element.Element("MaxCount")!.Value),
                ShopName = element.Element("ShopName")!.Value,
                Address = element.Element("Address")!.Value,
                DateOpen = Convert.ToDateTime(element.Element("DateOpen")!.Value),

                Computers = element.Element("ShopComputers")!.Elements("ShopComputer").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;
            Address = model.Address;
            MaxCount = model.MaxCount;
            DateOpen = model.DateOpen;
            if (model.ShopComputers.Count > 0)
            {
                Computers = model.ShopComputers.ToDictionary(x => x.Key, x => x.Value.Item2);
                _shopComputers = null;
            }
        }
        public ShopViewModel GetViewModel => new()
        {
            Id = Id,
            ShopName = ShopName,
            Address = Address,
            MaxCount = MaxCount,
            DateOpen = DateOpen,
            ShopComputers = ShopComputers
        };
        public XElement GetXElement => new("Shop",
            new XAttribute("Id", Id),
            new XElement("ShopName", ShopName),
            new XElement("Address", Address.ToString()),
            new XElement("MaxCount", MaxCount.ToString()),
            new XElement("DateOpen", DateOpen.ToString()),
            new XElement("ShopComputers", Computers.Select(x => new XElement("ShopComputer", new XElement("Key", x.Key),
            new XElement("Value", x.Value))).ToArray()));
    }
}