using FurnitureAssemblyContracts.BindingModels;
using FurnitureAssemblyContracts.ViewModels;
using FurnitureAssemblyDataModels.Models;
using FurnitureAssemFileImplement;
using System.Xml.Linq;

namespace FurnitureAssemblyFileImplement.Models
{
    public class Furniture : IFurnitureModel
    {
        public int Id { get; private set; }
        public string FurnitureName { 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)>? _furnitureComponents = null;
        public Dictionary<int, (IComponentModel, int)> FurnitureComponents
        {
            get
            {
                if (_furnitureComponents == null)
                {
                    var source = DataFileSingleton.GetInstance();
                    _furnitureComponents = Components.ToDictionary(x => x.Key, y =>
                    ((source.Components.FirstOrDefault(z => z.Id == y.Key) as IComponentModel)!,
                    y.Value));
                }
                return _furnitureComponents;
            }
        }

        public static Furniture? Create(FurnitureBindingModel model)
        {
            if (model == null)
            {
                return null;
            }
            return new Furniture()
            {
                Id = model.Id,
                FurnitureName = model.FurnitureName,
                Price = model.Price,
                Components = model.FurnitureComponents.ToDictionary(x => x.Key, x => x.Value.Item2)
            };
        }

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

        public void Update(FurnitureBindingModel model)
        {
            if (model == null)
            {
                return;
            }
            FurnitureName = model.FurnitureName;
            Price = model.Price;
            Components = model.FurnitureComponents.ToDictionary(x => x.Key, x => x.Value.Item2);
            _furnitureComponents = null;
        }

        public FurnitureViewModel GetViewModel => new()
        {
            Id = Id,
            FurnitureName = FurnitureName,
            Price = Price,
            FurnitureComponents = FurnitureComponents
        };
        public XElement GetXElement => new("Furniture", 
            new XAttribute("Id", Id), 
            new XElement("FurnitureName", FurnitureName), 
            new XElement("Price", Price.ToString()), 
            new XElement("FurnitureComponents", Components.Select(
                x => new XElement("FurnitureComponent", 
                    new XElement("Key", x.Key), 
                    new XElement("Value", x.Value))).ToArray()));
    }
}