using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Web;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Forms;
using System.Windows.Threading;
using BS.Shared.DataContracts;
using Newtonsoft.Json;
using MessageBox = System.Windows.MessageBox;

namespace BeWo.ownChat
{
    public class OwnChatHelper
    {
        public static void OpenOwnChatPdf(string tenant, string apikey, string benutzername, string passwort, string chatcode)
        {
            var r = HoleOwnChatPdf(tenant, apikey, benutzername, passwort, chatcode);


            switch (r)
            {
                case 0:
                    // wenn hier dann alles ok 

                    break;
                case 11:
                    MessageBox.Show("Kundennummer unbekannt.", "Fehler", MessageBoxButton.OK, MessageBoxImage.Exclamation);
                    break;
                case 12:
                    MessageBox.Show("Der API-Key ist falsch -> Auth-Error.", "Fehler", MessageBoxButton.OK, MessageBoxImage.Exclamation);
                    break;
                case 13:
                    MessageBox.Show("Es existiert kein API-Key für die angegebene Kundennummer.", "Fehler", MessageBoxButton.OK, MessageBoxImage.Exclamation);
                    break;
                case 40:
                    MessageBox.Show("Vorlage nicht gefunden.", "Fehler", MessageBoxButton.OK, MessageBoxImage.Exclamation);
                    break;
                case 41:
                    MessageBox.Show("Ungültige Custom-Logo-URL.", "Fehler", MessageBoxButton.OK, MessageBoxImage.Exclamation);
                    break;
                case 60:
                    MessageBox.Show("Fehler: \n" + "", "Fehler", MessageBoxButton.OK, MessageBoxImage.Exclamation);
                    break;
            }
        }

        private static int HoleOwnChatPdf(string tenant, string apikey, string benutzername, string passwort, string chatcode)
        {
            try
            {
                #region ServerErmittlung und Link ermittlung 
                string serverUrl = ErmittleServerURL(tenant);

                if (serverUrl == null)
                {
                    return 11;
                }
                else if (serverUrl.Equals(""))
                {
                    return 11;
                }

                var endurl = serverUrl + "/api/ownchat/createpdfmanual/" + apikey + "/" + tenant;
                #endregion

                #region Post Parameter Uebergabe

                Dictionary<string, string> postparameter = new Dictionary<string, string>();

                if (!String.IsNullOrEmpty(benutzername))
                    postparameter.Add("username", benutzername);

                if (!String.IsNullOrEmpty(passwort))
                    postparameter.Add("password", passwort);

                if (!String.IsNullOrEmpty(chatcode))
                    postparameter.Add("chatcode", chatcode);

                string postdaten = "";
                int i = 0;
                foreach (var key in postparameter.Keys)
                {
                    postdaten += HttpUtility.UrlEncode(key) + "=" + HttpUtility.UrlEncode(postparameter[key]) + "&";
                }
                #endregion

                #region Webrequest Aufbau ink. stream
                WebRequest requesten = WebRequest.Create(endurl);

                requesten.Method = "POST";
                requesten.ContentType = "application/x-www-form-urlencoded";

                byte[] daten = Encoding.ASCII.GetBytes(postdaten);

                requesten.ContentLength = daten.Length;

                try
                {
                    Stream requestStream = requesten.GetRequestStream();

                    requestStream.Write(daten, 0, daten.Length);

                    requestStream.Close();

                    var inte = VerarbeiteErhalteneDaten(requesten, chatcode);

                    return inte;
                }
                catch (Exception e)
                {
                    MessageBox.Show("Es konnte keine Verbindung aufgebaut werden.", "Fehler", MessageBoxButton.OK);
                    
                    return 0;
                }
                #endregion

            }
            catch (Exception e)
            {
                return 60;
            }
        }

        public static int VerarbeiteErhalteneDaten(WebRequest requesten, string chatcode)
        {
            try
            {
                #region Verarbeitung der Erhaltenen Daten 

                using (HttpWebResponse response = (HttpWebResponse) requesten.GetResponse())
                {

                    string responseFromServer = "";

                    using (Stream reqStr2 = response.GetResponseStream())
                    {

                        byte[] barray = null;

                        byte[] Stringmesage = null;

                        using (var memoryStream = new MemoryStream())
                        {
                            reqStr2.CopyTo(memoryStream);
                            barray = memoryStream.ToArray();
                        }

                        if (barray != null)
                        {
                            Stringmesage = barray;

                            responseFromServer = System.Text.Encoding.Default.GetString(Stringmesage);
                        }

                        if (responseFromServer.Contains("PDF"))
                        {

                            SaveFileDialog saveFileDialog1 = new SaveFileDialog();

                            saveFileDialog1.Title = "Dokument Speichern";
                            saveFileDialog1.FileName = Path.GetFileName(String.Format("ownChat-Kurzanleitung_{0}.pdf", chatcode));
                            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
                            {

                                File.WriteAllBytes(saveFileDialog1.FileName, barray);

                                Process.Start(saveFileDialog1.FileName);

                                reqStr2.Close();
                            }
                            return 0;
                        }
                        else
                        {
                            var jsonDatentyp = JsonConvert.DeserializeObject<PdfChatHandoutDC>(responseFromServer);

                            return jsonDatentyp.Result;
                        }
                    }

                }


                #endregion
            }
            catch (Exception e)
            {
                return 60;
            }
        }

        private static string ErmittleServerURL(string tenant)
        {
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

            string url = "https://dict.ownchat.de/api/server/resolve/1/" + tenant;//customerId; //customerid == kundennummer

            WebRequest request = WebRequest.Create(url);

            request.Credentials = CredentialCache.DefaultCredentials;

            WebResponse response = request.GetResponse();


            Stream dataStream = response.GetResponseStream();

            StreamReader reader = new StreamReader(dataStream);

            string responseFromServer = reader.ReadToEnd();

            dataStream.Dispose();
            reader.Dispose();

            dataStream.Close();
            reader.Close();

            var definition = new { status = "", URL = "", SYNCTYPE = "" };

            var jsondaten = JsonConvert.DeserializeAnonymousType(responseFromServer, definition);

            string serverUrl = jsondaten.URL;
            response.Close();

            return serverUrl;
            
        }
    }
}