using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Xml;

namespace Neo.Legitimate.LTPSWebService.Data
{
    public class LTPSApplication
    {
        private LTPSApplication()
        {
        }
        public static string Verify(string password, string data)
        {
            string result;
            if (!LTPSApplication.ValidPassword(password))
            {
                result = null;
            }
            else
            {
                XmlDocument xmlDoc = LTPSApplication.DecryptXml(data);
                LTPSOperatingLicence ol = new LTPSOperatingLicence(xmlDoc.SelectSingleNode("OperatingLicence") as XmlElement);
                ol.Verify();
                result = LTPSApplication.Encrypt(xmlDoc.OuterXml);
            }
            return result;
        }
        public static string Submit(string password, string data)
        {
            string result;
            if (!LTPSApplication.ValidPassword(password))
            {
                result = null;
            }
            else
            {
                XmlDocument xmlDoc = LTPSApplication.DecryptXml(data);
                LTPSOperatingLicence ol = new LTPSOperatingLicence(xmlDoc.SelectSingleNode("OperatingLicence") as XmlElement);
                ol.Create(null);
                result = LTPSApplication.Encrypt(xmlDoc.OuterXml);
            }
            return result;
        }
        public static string Query(string password, string data)
        {
            string result;
            if (!LTPSApplication.ValidPassword(password))
            {
                result = null;
            }
            else
            {
                XmlDocument xmlCommand = LTPSApplication.DecryptXml(data);
                LTPSDataBroker db = new LTPSDataBroker();
                XmlDocument xmlResult = db.Execute(xmlCommand);
                result = LTPSApplication.Encrypt(xmlResult.OuterXml);
            }
            return result;
        }
        private static string Encrypt(string plainText)
        {
            return CryptoProvider.Encrypt(ConfigurationManager.AppSettings["RijndaelKey"], ConfigurationManager.AppSettings["RijndaelIV"], plainText);
        }
        private static string Decrypt(string cipher)
        {
            return CryptoProvider.Decrypt(ConfigurationManager.AppSettings["RijndaelKey"], ConfigurationManager.AppSettings["RijndaelIV"], cipher);
        }
        private static XmlDocument DecryptXml(string xmlCipher)
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.LoadXml(LTPSApplication.Decrypt(xmlCipher));
            return xmlDoc;
        }
        private static bool ValidPassword(string password)
        {
            return ConfigurationManager.AppSettings["Password"] == LTPSApplication.Decrypt(password);
        }
    }
}