using System;
using System.IO;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Xml;
using Kreta.Resources;

namespace Kreta.EESZTInterface.STS
{
    public class DoRequest
    {
        public static XmlDocument GetSoapSamlResponse(string stsUri, X509Certificate2 sslAuthCert, XmlDocument soapSamlRequest)
        {
            try
            {
                HttpWebRequest request = GetHttpWebRequest(stsUri, sslAuthCert);
                var response = WriteToHttpStream(request, soapSamlRequest);
                var soapResponse = ThrowIfSoapFault(response, stsUri);

                return soapResponse;

            }
            catch (WebException wex)
            {
                string exMessage = wex.Message;

                if (wex.Response != null)
                {
                    using (var responseReader = new StreamReader(wex.Response.GetResponseStream()))
                    {
                        exMessage = responseReader.ReadToEnd();
                        ThrowIfSoapFault(exMessage, wex.Response.ResponseUri.OriginalString);
                    }
                }
                throw new Exception(exMessage, wex);
            }
            catch
            {
                throw;
            }
        }

        private static HttpWebRequest GetHttpWebRequest(string stsUri, X509Certificate2 sslAuthCert)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(stsUri);
            request.Headers.Add("SOAPAction", STSValues.soapActionValue);
            request.ContentType = "application/soap+xml;charset=\"utf-8\"";
            request.Accept = "application/soap+xml";
            request.Method = "POST";
            request.ClientCertificates.Add(sslAuthCert);
            return request;
        }

        private static string WriteToHttpStream(HttpWebRequest request, XmlDocument samlRequest)
        {
            var outputStream = new MemoryStream();
            samlRequest.Save(outputStream);

            request.ContentLength = outputStream.Length;
            outputStream.Seek(0, SeekOrigin.Begin);

            var outStr = outputStream.ToArray();
            outputStream.Close();

            using (Stream requestStream = request.GetRequestStream())
            {
                using (StreamWriter stmw = new StreamWriter(requestStream))
                {
                    requestStream.Write(outStr, 0, outStr.Length);
                }
            }

            string responseString = string.Empty;
            WebResponse response = request.GetResponse();
            using (StreamReader sr = new StreamReader(response.GetResponseStream()))
            {
                responseString = sr.ReadToEnd();
            }
            return responseString;

        }

        private static XmlDocument ThrowIfSoapFault(string response, string responseUri)
        {
            XmlDocument soapMessage = null;

            try
            {
                soapMessage = ExtractDocumentFromResponse(response);

                if (soapMessage == null)
                {
                    throw new Exception();
                }
            }
            catch (Exception ex)
            {
                throw new Exception(string.Format(EESZTInterfaceResource.NemMegfeleloSOAPValaszFormatum, responseUri, response), ex);
            }

            XmlElement fault = XmlHelper.GetElement("Fault", Namespaces.soap12Ns, soapMessage.DocumentElement);
            if (fault == null)
            {
                return soapMessage;
            }

            var faultCodeNodes = XmlHelper.GetElement("Code", Namespaces.soap12Ns, fault);
            var faultReasonNodes = XmlHelper.GetElement("Reason", Namespaces.soap12Ns, fault);
            var exceptionDetailNodes = XmlHelper.GetElement("Detail", Namespaces.soap12Ns, fault);

            throw new Exception("Hiba! Kód:" + faultCodeNodes.InnerText + " Részletek:" + faultReasonNodes.InnerText,
                  new Exception((exceptionDetailNodes == null) ? "" : exceptionDetailNodes.InnerText));
        }

        private static XmlDocument ExtractDocumentFromResponse(string response)
        {
            var soapResponse = new XmlDocument();
            soapResponse.PreserveWhitespace = true;
            soapResponse.LoadXml(response);

            return soapResponse;
        }

        private bool ValidateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
        {
            return true;
        }

    }
}