using System;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Ink;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using System.Xml.Linq;

using System.IO;

using System.Collections.Generic;

using System.Threading;

namespace Iri.Modernisation.Data.Models

{

    public interface ILoader

    {

    }

    /// <summary>

    /// Classe permettant de charger un XML et de convertir son contenu en un type ReturnType désiré

    /// </summary>

    /// <typeparam name="ReturnType">Type Désiré</typeparam>

    {

        private AutoResetEvent Are { get; set; }

        public String Path { get; set; }

        /// <summary>

        /// WebClient qui permet de charger le XML distant

        /// </summary>

        public  WebClient xmlClient {get; private set;}

        /// <summary>

        /// Fonction permettant de transcrire le document XML en Type désiré

        /// </summary>

        private Func<XDocument, ResultType> ProcessFunction { get; set; }

        /// <summary>

        /// Constructeur

        /// </summary>

        /// <param name="processFunction">Fonction de transtypage</param>

       public Loader(Func<XDocument,ResultType> processFunction)

        {

            ProcessFunction = processFunction;

            xmlClient = new WebClient();

        }

        /// <summary>

        /// Téléchargement des données 

        /// </summary>

        /// <param name="path">Chemin du fichier</param>

        public void Load(String path)

        {

            //Here it's working

            // Are.Set();

            this.Path = path;

            xmlClient.DownloadStringCompleted += new DownloadStringCompletedEventHandler(xmlClient_DownloadStringCompleted);

            xmlClient.DownloadStringAsync(new Uri(path,UriKind.RelativeOrAbsolute));

            //Here not

            //Are.Set();

        }

        /// <summary>

        /// Une fois le fichier télécharger, on commence le transtypage

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void xmlClient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)

        {

            //On utilise la fonction donnée lors de la construction du Loader pour créer l'objet grâce au fichier XML

            ResultType result = ProcessFunction.Invoke(XDocument.Parse(e.Result));

            if (LoaderFinished != null)

            {

                //Une fois le Transtypage Fini, on lance l'évenement indiquant que le chargement est fini et donnant

                // en argument l'objet créé.

                LoaderFinished(this, new LoaderEventArgs<ResultType>(result));

            }

        }

        public void  Execute(Object sender)

        {

            Are = (AutoResetEvent)sender;

            Load(this.Path);

        }

    }

    public class LoaderEventArgs<ResultType> :  EventArgs

    {

        public ResultType CreatedObject { get; private set; }

        public AutoResetEvent Are { get; private set; }

        public LoaderEventArgs(ResultType createdObject)

        {

            CreatedObject = createdObject;

            Are = null;

        }

        public LoaderEventArgs(ResultType createdObject,AutoResetEvent are)

        {

            CreatedObject = createdObject;

            Are = are;

        }

    }

}