using framework_library;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace framework_business
{
    public class licenceHandler
    {

        /// <summary>
        /// Procedure to validate a licence
        /// </summary>
        /// <param name="customerName"></param>
        /// <param name="licenceKey"></param>
        /// <param name="licenceDate"></param>
        /// <param name="customerCode"></param>
        /// <returns>oLicenceResult</returns>
        public static oLicenceResult ValidateLicence(string customerName, string licenceKey, DateTime licenceDate, string customerCode)
        {
            oLicenceResult result = new oLicenceResult();
            bool failed = false;
            encryption encrypt = new encryption("3v0l#t!0ns0ftw@r3");
            oLicence licValidate = GetLicence(licenceKey);
            //validate licence
            if (licValidate.licenceKey == licenceKey)
            {
                if (licValidate.customerName.Trim() != customerName.Trim())
                {
                    failed = true;
                    result.failedReasons.Add("Customer Name does not match.");
                }

                if (licValidate.licenceDate.ToString("yyyy-MM-dd") != licenceDate.ToString("yyyy-MM-dd"))
                {
                    failed = true;
                    result.failedReasons.Add("License Date does not match.");
                }

                if (licValidate.customerCode != customerCode)
                {
                    failed = true;
                    result.failedReasons.Add("Customer Code dont match.");
                }
            }
            else
            {
                failed = true;
                result.failedReasons.Add("Invalid Licence.");
            }



            if (failed)//failed
                result.successful = false;
            else
                result.successful = true;

            return result;
        }

        /// <summary>
        /// Create a License
        /// </summary>
        /// <param name="Licence"></param>
        /// <returns></returns>
        public static oLicence CreateLicence(oLicence Licence)
        {
            oLicence result = new oLicence();
            encryption encrypt = new encryption("3v0l#t!0ns0ftw@r3");
            
            StringBuilder data = new StringBuilder();
            //build up pipe delimited data to be encrypted and hashed

            //customer name
            data.Append(Licence.customerName + "|");
            //licence date
            data.Append(Licence.licenceDate.ToString("yyyy-MM-dd") + "|");
            //customer code
            data.Append(Licence.customerCode);
                        
            //encrypt data
            string key = encrypt.encryptValue(data.ToString());
            if (key != String.Empty)
            {
                Licence.licenceKey = key;
            }
            result = Licence;
            return result;
        }

        /// <summary>
        /// Get License
        /// </summary>
        /// <param name="licenceKey"></param>
        /// <returns></returns>
        public static oLicence GetLicence(string licenceKey)
        {
            oLicence result = new oLicence();
            encryption encrypt = new encryption("3v0l#t!0ns0ftw@r3");
            string data = encrypt.decryptData(licenceKey);

            string[] dataArr = data.Split(char.Parse("|"));

            if (dataArr.Length == 3)
            {
                result.customerName = dataArr[0];
                result.licenceDate = DateTime.Parse(dataArr[1]);
                result.customerCode = dataArr[2];
                result.licenceKey = licenceKey;                
            }

            return result;
        }

    }
}