using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ComputersShopContracts.BindingModels;
using ComputersShopContracts.ViewModels;
using ComputersShopDataModels.Models;
using System.Xml.Linq;

namespace ComputersShopFileImplements.Models
{
    public class Computer: IComputerModel
    {
        public int Id { get; private set; }
        public string ComputerName { 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)>? _computerComponents = null;
        public Dictionary<int, (IComponentModel, int)> ComputerComponents
        {
            get
            {
                if (_computerComponents == null)
                {
                    var source = DataFileSingleton.GetInstance();
                    _computerComponents = Components.ToDictionary(x => x.Key, y =>
                    ((source.Components.FirstOrDefault(z => z.Id == y.Key) as IComponentModel)!,
                    y.Value));
                }
                return _computerComponents;
            }
        }
        public static Computer? Create(ComputerBindingModel model)
        {
            if (model == null)
            {
                return null;
            }
            return new Computer()
            {
                Id = model.Id,
                ComputerName = model.ComputerName,
                Price = model.Price,
                Components = model.ComputerComponents.ToDictionary(x => x.Key, x => x.Value.Item2)
            };
        }
        public static Computer? Create(XElement element)
        {
            if (element == null)
            {
                return null;
            }
            return new Computer()
            {
                Id = Convert.ToInt32(element.Attribute("Id")!.Value),
                ComputerName = element.Element("ComputerName")!.Value,
                Price = Convert.ToDouble(element.Element("Price")!.Value),
                Components =
                element.Element("ComputerComponents")!.Elements("ComputerComponent")
                .ToDictionary(x =>
                Convert.ToInt32(x.Element("Key")?.Value), x =>
                Convert.ToInt32(x.Element("Value")?.Value))
            };
        }
        public void Update(ComputerBindingModel model)
        {
            if (model == null)
            {
                return;
            }
            ComputerName = model.ComputerName;
            Price = model.Price;
            Components = model.ComputerComponents.ToDictionary(x => x.Key, x => x.Value.Item2);
            _computerComponents = null;
        }
        public ComputerViewModel GetViewModel => new()
        {
            Id = Id,
            ComputerName = ComputerName,
            Price = Price,
            ComputerComponents = ComputerComponents
        };
        public XElement GetXElement => new("Computer",
            new XAttribute("Id", Id),
            new XElement("ComputerName", ComputerName),
            new XElement("Price", Price.ToString()),
            new XElement("ComputerComponents", Components.Select(x =>
            new XElement("ComputerComponent", new XElement("Key", x.Key),
            new XElement("Value", x.Value))).ToArray()));
    }
}