using AircraftPlantContracts.BindingModels;
using AircraftPlantContracts.ViewModels;
using AircraftPlantDataModels.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

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

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

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

        /// <summary>
        /// Дата открытия магазина
        /// </summary>
        public DateTime DateOpening { get; private set; }

        /// <summary>
        /// Коллекция изделий магазина в виде
        /// «идентификатор изделия – количество изделий»
        /// </summary>
        public Dictionary<int, int> Planes { get; private set; } = new();

        /// <summary>
        /// Коллекция изделий в магазине
        /// </summary>
        private Dictionary<int, (IPlaneModel, int)>? _shopPlanes = null;
        public Dictionary<int, (IPlaneModel, int)> ShopPlanes
        {
            get
            {
                if (_shopPlanes == null)
                {
                    var source = DataFileSingleton.GetInstance();
                    _shopPlanes = Planes.ToDictionary(x => x.Key, y => ((source.Planes.FirstOrDefault(z => z.Id == y.Key) as IPlaneModel)!, y.Value));
                }
                return _shopPlanes;
            }
        }

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

        /// <summary>
        /// Создание модели магазина из данных файла
        /// </summary>
        /// <param name="element"></param>
        /// <returns></returns>
        public static Shop? Create(XElement element)
        {
            if (element == null)
            {
                return null;
            }
            return new()
            {
                Id = Convert.ToInt32(element.Attribute("Id")!.Value),
                ShopName = element.Element("ShopName")!.Value,
                Address = element.Element("Address")!.Value,
                DateOpening = Convert.ToDateTime(element.Element("DateOpening")!.Value),
                Planes = element.Element("ShopPlanes")!.Elements("ShopPlanes")!
                    .ToDictionary(x => Convert.ToInt32(x.Element("Key")?.Value), x => Convert.ToInt32(x.Element("Value")?.Value)),
                MaxPlanes = Convert.ToInt32(element.Element("MaxPlanes")!.Value)
            };
        }

        /// <summary>
        /// Создание модели магазина
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public static Shop? Create(ShopBindingModel? model)
        {
            if (model == null)
            {
                return null;
            }

            return new Shop()
            {
                Id = model.Id,
                ShopName = model.ShopName,
                Address = model.Address,
                DateOpening = model.DateOpening,
                Planes = model.ShopPlanes.ToDictionary(x => x.Key, x => x.Value.Item2),
                MaxPlanes = model.MaxPlanes
            };
        }

        /// <summary>
        /// Изменение модели магазина
        /// </summary>
        /// <param name="model"></param>
        public void Update(ShopBindingModel? model)
        {
            if (model == null)
            {
                return;
            }

            ShopName = model.ShopName;
            Address = model.Address;
            DateOpening = model.DateOpening;
            Planes = model.ShopPlanes.ToDictionary(x => x.Key, x => x.Value.Item2);
            MaxPlanes = model.MaxPlanes;
            _shopPlanes = null;
        }

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

        /// <summary>
        /// Запись данных о модели магазина в файл
        /// </summary>
        public XElement GetXElement => new("Shop",
            new XAttribute("Id", Id),
            new XElement("ShopName", ShopName),
            new XElement("Address", Address),
            new XElement("DateOpening", DateOpening.ToString()),
            new XElement("ShopPlanes", Planes.Select(x =>
                new XElement("ShopPlanes",
                new XElement("Key", x.Key),
                new XElement("Value", x.Value))).ToArray()),
            new XElement("MaxPlanes", MaxPlanes.ToString()));
    }
}