using FurnitureAssemblyContracts.BindingModels;
using FurnitureAssemblyContracts.ViewModels;
using FurnitureAssemblyDataModels.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace FurnitureAssemblyFileImplement.Models
{
    internal class Furniture
    {
        public int Id { get; private set; }

        public string FurnitureName { get; private set; } = string.Empty;
        public double Price { get; private set; }

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

        private Dictionary<int, (IWorkpieceModel, int)>? _furnitureWorkpieces = null;

        public Dictionary<int, (IWorkpieceModel, int)> FurnitureWorkpieces
        {
            get
            {
                if (_furnitureWorkpieces == null)
                {
                    var source = DataFileSingleton.GetInstance();

                    _furnitureWorkpieces = Workpieces.ToDictionary(x => x.Key,
                                                                    y => ((source.Workpieces.FirstOrDefault(z => z.Id == y.Key) as IWorkpieceModel)!, y.Value));
                }

                return _furnitureWorkpieces;
            }
        }

        public static Furniture? Create(FurnitureBindingModel model)
        {
            if (model == null)
            {
                return null;
            }

            return new Furniture()
            {
                Id = model.Id,
                FurnitureName = model.FurnitureName,
                Price = model.Price,
                Workpieces = model.FurnitureWorkpieces.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),
                Workpieces = element.Element("FurnitureWorkpieces")!.Elements("FurnitureWorkpieces").ToDictionary(
                    x => Convert.ToInt32(x.Element("Key")?.Value),
                    y => Convert.ToInt32(y.Element("Value")?.Value))
            };
        }

        public void Update(FurnitureBindingModel model)
        {
            if (model == null)
            {
                return;
            }

            FurnitureName = model.FurnitureName;
            Price = model.Price;
            Workpieces = model.FurnitureWorkpieces.ToDictionary(x => x.Key, x => x.Value.Item2);
            _furnitureWorkpieces = null;
        }

        public FurnitureViewModel GetViewModel => new()
        {
            Id = Id,
            FurnitureName = FurnitureName,
            Price = Price,
            FurnitureWorkpieces = FurnitureWorkpieces
        };

        public XElement GetXElement => new("Furniture",
            new XAttribute("Id", Id),
            new XElement("FurnitureName", FurnitureName),
            new XElement("Price", Price.ToString()),
            new XElement("FurnitureWorkpieces", Workpieces.Select(
                x => new XElement("FurnitureWorkpieces",
                    new XElement("Key", x.Key),
                    new XElement("Value", x.Value))
                ).ToArray()));
    }
}