using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TravelCompanyDataModels.Models;
using TravelCompanyContracts.ViewModels;
using TravelCompanyContracts.BindingModels;
using System.Xml.Linq;


namespace TravelCompanyFileImplement.Models
{
    public class Travel : ITravelModel
    {
        public int Id { get; private set; }
        public string TravelName { get; private set; } = string.Empty;
        public double Price { get; private set; }
        public Dictionary<int, int> Conditions { get; private set; } = new();
        private Dictionary<int, (IConditionModel, int)>? _travelConditions = null;
        public Dictionary<int, (IConditionModel, int)> TravelConditions
        {
            get
            {
                if (_travelConditions == null)
                {
                    var source = DataFileSingleton.GetInstance();
                    _travelConditions = Conditions.ToDictionary(x => x.Key, y => ((source.Conditions.FirstOrDefault(z => z.Id == y.Key) as IConditionModel)!,y.Value));
                }
                return _travelConditions;
            }
        }
        public static Travel? Create(TravelBindingModel model)
        {
            if (model == null)
            {
                return null;
            }
            return new Travel()
            {
                Id = model.Id,
                TravelName = model.TravelName,
                Price = model.Price,
                Conditions = model.TravelConditions.ToDictionary(x => x.Key, x=> x.Value.Item2)
            };
        }
        public static Travel? Create(XElement element)
        {
            if (element == null)
            {
                return null;
            }
            return new Travel()
            {
                Id = Convert.ToInt32(element.Attribute("Id")!.Value),
                TravelName = element.Element("TravelName")!.Value,
                Price = Convert.ToDouble(element.Element("Price")!.Value),
                Conditions = element.Element("TravelConditions")!.Elements("TravelCondition").ToDictionary(x =>Convert.ToInt32(x.Element("Key")?.Value), x =>Convert.ToInt32(x.Element("Value")?.Value))
            };
        }
        public void Update(TravelBindingModel model)
        {
            if (model == null)
            {
                return;
            }
            TravelName = model.TravelName;
            Price = model.Price;
            Conditions = model.TravelConditions.ToDictionary(x => x.Key, x =>x.Value.Item2);
            _travelConditions = null;
        }
        public TravelViewModel GetViewModel => new()
        {
            Id = Id,
            TravelName = TravelName,
            Price = Price,
            TravelConditions = TravelConditions
        };
        public XElement GetXElement => new("Travel",
        new XAttribute("Id", Id),
        new XElement("TravelName", TravelName),
        new XElement("Price", Price.ToString()),
        new XElement("TravelConditions", Conditions.Select(x =>
       new XElement("TravelCondition",

       new XElement("Key", x.Key),

       new XElement("Value", x.Value)))

       .ToArray()));
    }

}