using FoodOrdersContracts.BindingModels;
using FoodOrdersContracts.ViewModels;
using FoodOrdersDataModels.Models;
using System.Runtime.Serialization;
using System.Xml.Linq;

namespace FoodOrdersFileImplement.Models
{
    [DataContract]
    public class Dish : IDishModel
    {
        [DataMember]
        public int Id { get; private set; }

        [DataMember]
        public string DishName { get; private set; } = string.Empty;

        [DataMember]
        public double Price { get; private set; }

        public Dictionary<int, int> Components { get; private set; } = new();

        private Dictionary<int, (IComponentModel, int)>? _DishComponents = null;

        [DataMember]
        public Dictionary<int, (IComponentModel, int)> DishComponents
        {
            get
            {
                if (_DishComponents == null)
                {
                    var source = DataFileSingleton.GetInstance();
                    _DishComponents = Components.ToDictionary(x => x.Key, 
                        y => ((source.Components.FirstOrDefault(z => z.Id == y.Key) as IComponentModel)!, y.Value));
                }
                return _DishComponents;
            }
        }

        public static Dish? Create(DishBindingModel? model)
        {
            if (model == null)
            {
                return null;
            }
            return new Dish()
            {
                Id = model.Id,
                DishName = model.DishName,
                Price = model.Price,
                Components = model.DishComponents.ToDictionary(x => x.Key, x => x.Value.Item2)
            };
        }

        public static Dish? Create(XElement element)
        {
            if (element == null)
            {
                return null;
            }
            return new Dish()
            {
                Id = Convert.ToInt32(element.Attribute("Id")!.Value),
                DishName = element.Element("DishName")!.Value,
                Price = Convert.ToDouble(element.Element("Price")!.Value),
                Components = element.Element("DishComponents")!.Elements("DishComponent")
                                .ToDictionary(x => Convert.ToInt32(x.Element("Key")?.Value), x => Convert.ToInt32(x.Element("Value")?.Value))
            };
        }

        public void Update(DishBindingModel? model)
        {
            if (model == null)
            {
                return;
            }
            DishName = model.DishName;
            Price = model.Price;
            Components = model.DishComponents.ToDictionary(x => x.Key, x => x.Value.Item2);
            _DishComponents = null;
        }

        public DishViewModel GetViewModel => new()
        {
            Id = Id,
            DishName = DishName,
            Price = Price,
            DishComponents = DishComponents
        };

        public XElement GetXElement => new("Dish",
                        new XAttribute("Id", Id),
                        new XElement("DishName", DishName),
                        new XElement("Price", Price.ToString()),
                        new XElement("DishComponents", 
                            Components.Select(x => new XElement("DishComponent",
                                                                new XElement("Key", x.Key),
                                                                new XElement("Value", x.Value))).ToArray()));
    }
}