using ConfectioneryContracts.BindingModels;
using ConfectioneryContracts.ViewModels;
using ConfectioneryDataModels.Models;
using System.Xml.Linq;
namespace ConfectioneryFileImplement.Models
{
    public class Pastry : IPastryModel
    {
        public int Id { get; private set; }
        public string PastryName { get; private set; } = string.Empty;
        public double Price { get; private set; }
        public Dictionary<int, int> Components { get; private set; } = new();
        private Dictionary<int, (IComponentModel, int)>?
            _pastryComponents = null;
        public Dictionary<int, (IComponentModel, int)> PastryComponents
        {
            get
            {
                if (_pastryComponents == null)
                {
                    var source = DataFileSingleton.GetInstance();
                    _pastryComponents = Components
                        .ToDictionary(x => x.Key, y => ((source.Components
                        .FirstOrDefault(z => z.Id == y.Key) as 
                        IComponentModel)!, y.Value));
                }
                return _pastryComponents;
            }
        }
        public static Pastry? Create(PastryBindingModel model)
        {
            if (model == null)
            {
                return null;
            }
            return new Pastry()
            {
                Id = model.Id,
                PastryName = model.PastryName,
                Price = model.Price,
                Components = model.PastryComponents.ToDictionary(x => x.Key,
                    x => x.Value.Item2)
            };
        }
        public static Pastry? Create(XElement element)
        {
            if (element == null)
            {
                return null;
            }
            return new Pastry()
            {
                Id = Convert.ToInt32(element.Attribute("Id")!.Value),
                PastryName = element.Element("PastryName")!.Value,
                Price = Convert.ToDouble(element.Element("Price")!.Value),
                Components = element.Element("PastryComponents")!
                .Elements("PastryComponent").ToDictionary(x => 
                Convert.ToInt32(x.Element("Key")?.Value), x =>
                Convert.ToInt32(x.Element("Value")?.Value))
            };
        }
        public void Update(PastryBindingModel model)
        {
            if (model == null)
            {
                return;
            }
            PastryName = model.PastryName;
            Price = model.Price;
            Components = model.PastryComponents.ToDictionary(x => x.Key,
                x => x.Value.Item2);
            _pastryComponents = null;
        }
        public PastryViewModel GetViewModel => new()
        {
            Id = Id,
            PastryName = PastryName,
            Price = Price,
            PastryComponents = PastryComponents
        };
        public XElement GetXElement => new("Pastry",
            new XAttribute("Id", Id),
            new XElement("PastryName", PastryName),
            new XElement("Price", Price.ToString()),
            new XElement("PastryComponents", Components.Select(x =>
            new XElement("PastryComponent",
            new XElement("Key", x.Key),
            new XElement("Value", x.Value))).ToArray()));
    }
}