using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Text;
using System.Net;
using System.IO;
using System.Xml;

/// <summary>
/// Summary description for ShippingCalculator
/// </summary>
namespace MyCo.BusinessLogic
{
    public static class ShippingCalculator
    {
        public static decimal GetShippingCost(string shipFromZipCode, string shipToZipCode, string serviceRateCode, string packageWeight)
        {
            decimal shippingCost = -1;
            string URL = "https://www.ups.com/ups.app/xml/Rate";
            WebRequest objRequest = WebRequest.Create(URL);
            objRequest.Method = "POST";
            objRequest.ContentType = "application/x-www-form-urlencoded";

            using (StreamWriter writer = new StreamWriter(objRequest.GetRequestStream()))
            {
                writer.Write(GetAuthXML("accesskey", "username", "password"));
                writer.Write(GetRequestXML(shipFromZipCode, shipToZipCode, serviceRateCode, packageWeight));
                writer.Flush();
                writer.Close();
            }

            objRequest.Timeout = 5000;

            try
            {
                using (WebResponse objResponse = objRequest.GetResponse())
                {
                    XmlDocument xmlResponse = new XmlDocument();
                    xmlResponse.Load(objResponse.GetResponseStream());
                    int responseStatusCode = int.Parse(xmlResponse.SelectSingleNode("//RatingServiceSelectionResponse/Response/ResponseStatusCode").InnerText);

                    if (responseStatusCode == 1)
                    {
                        XmlNodeList xmlNodeList = xmlResponse.SelectNodes(string.Format("/RatingServiceSelectionResponse/RatedShipment/TotalCharges[../Service/Code={0}]/MonetaryValue", serviceRateCode));

                        foreach (XmlElement xmlElement in xmlNodeList)
                        {
                            shippingCost = decimal.Parse(xmlElement.InnerText);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                //Log exception
            }

            return shippingCost;
        }
        private static string GetAuthXML(string accessLicenseNumber, string userID, string password)
        {
            StringBuilder xmlAuthTemplate = new StringBuilder();

            xmlAuthTemplate.Append("<?xml version="1.0"?>");
            xmlAuthTemplate.Append("<AccessRequest xml:lang="en-US">");
            xmlAuthTemplate.Append(string.Format("<AccessLicenseNumber>{0}</AccessLicenseNumber>", accessLicenseNumber));
            xmlAuthTemplate.Append(string.Format("<UserId>{0}</UserId>", userID));
            xmlAuthTemplate.Append(string.Format("<Password>{0}</Password>", password));
            xmlAuthTemplate.Append("</AccessRequest>");
            xmlAuthTemplate.Append("<?xml version="1.0"?>");

            return xmlAuthTemplate.ToString();
        }
        private static string GetRequestXML(string shipFromZipCode, string shipToZipCode, string serviceRateCode, string packageWeight)
        {
            StringBuilder xmlRequestTemplate = new StringBuilder();

            xmlRequestTemplate.Append("<RatingServiceSelectionRequest xml:lang="en-US">");
            xmlRequestTemplate.Append("<Request>");
            xmlRequestTemplate.Append("<TransactionReference>");
            xmlRequestTemplate.Append("<CustomerContext>Rating and Service</CustomerContext>");
            xmlRequestTemplate.Append("<XpciVersion>1.0001</XpciVersion>");
            xmlRequestTemplate.Append("</TransactionReference>");
            xmlRequestTemplate.Append("<RequestAction>Rate</RequestAction>");
            xmlRequestTemplate.Append("<RequestOption>shop</RequestOption>");
            xmlRequestTemplate.Append("</Request>");
            xmlRequestTemplate.Append("<PickupType>");
            xmlRequestTemplate.Append("<Code>01</Code>");
            xmlRequestTemplate.Append("</PickupType>");
            xmlRequestTemplate.Append("<Shipment>");
            xmlRequestTemplate.Append("<Shipper>");
            xmlRequestTemplate.Append("<Address>");
            xmlRequestTemplate.Append(string.Format("<PostalCode>{0}</PostalCode>", shipFromZipCode));
            xmlRequestTemplate.Append("</Address>");
            xmlRequestTemplate.Append("</Shipper>");
            xmlRequestTemplate.Append("<ShipTo>");
            xmlRequestTemplate.Append("<Address>");
            xmlRequestTemplate.Append(string.Format("<PostalCode>{0}</PostalCode>", shipToZipCode));
            xmlRequestTemplate.Append("</Address>");
            xmlRequestTemplate.Append("</ShipTo>");
            xmlRequestTemplate.Append("<Service>");
            xmlRequestTemplate.Append(string.Format("<Code>{0}</Code>", serviceRateCode));
            xmlRequestTemplate.Append("</Service>");
            xmlRequestTemplate.Append("<Package>");
            xmlRequestTemplate.Append("<PackagingType>");
            xmlRequestTemplate.Append("<Code>02</Code>");
            xmlRequestTemplate.Append("<Description>Package</Description>");
            xmlRequestTemplate.Append("</PackagingType>");
            xmlRequestTemplate.Append("<Description>Rate Shopping</Description>");
            xmlRequestTemplate.Append("<PackageWeight>");
            xmlRequestTemplate.Append(string.Format("<Weight>{0}</Weight>", packageWeight));
            xmlRequestTemplate.Append("</PackageWeight>");
            xmlRequestTemplate.Append("</Package>");
            xmlRequestTemplate.Append("<ShipmentServiceOptions/>");
            xmlRequestTemplate.Append("</Shipment>");
            xmlRequestTemplate.Append("</RatingServiceSelectionRequest>");
            xmlRequestTemplate.Append("</RatingServiceSelectionRequest>");

            return xmlRequestTemplate.ToString();
        }
    }
}