using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Net.Mail;
using System.Threading.Tasks;
using EnVisage.Properties;
using NLog;
using System.Text;
using System.Data.Entity.Validation;

namespace EnVisage.Code
{
    public class MailManager
    {
        private const string INVITATION_MESSAGE_SUBJECT = "Activate your Prevu account";
        private const string INVITATION_SSO_MESSAGE_SUBJECT = "Your Prevu account has been created";
        private const string INVITATION_MESSAGE_BODY = "Hello, {{user_name}}. {{new_line}}{{new_line}}Please activate your Prevu account by clicking the following link: {{activation_link}} {{new_line}}{{new_line}}Thank you!";
        private const string INVITATION_SSO_MESSAGE_BODY = "Hello, {{user_name}}. {{new_line}}{{new_line}}your Prevu account has been created and is ready for you to access by clicking the following link: {{activation_link}} {{new_line}}{{new_line}}Thank you!";
        private const string RESTORE_PASSWORD_MESSAGE_SUBJECT = "Restore password";
        private const string RESTORE_PASSWORD_MESSAGE_BODY = "Hello, {{user_name}}. {{new_line}}{{new_line}}You can restore your Prevu account by clicking the following link: {{activation_link}}{{new_line}}{{new_line}}The link can only be used for {{TTL}} hours. {{new_line}}{{new_line}}Thank you!";
        protected static readonly Logger Logger = LogManager.GetCurrentClassLogger();

        public static void SendInvitationMessage(string email, string userName, string userId, bool isSSO)
        {
            string text = INVITATION_MESSAGE_BODY;
            string subject = INVITATION_MESSAGE_SUBJECT;

            if (isSSO)
            {
                text = INVITATION_SSO_MESSAGE_BODY;
                subject = INVITATION_SSO_MESSAGE_SUBJECT;
            }
            string link;

            if (HttpContext.Current.Request.Url.Port == 80 || HttpContext.Current.Request.Url.Port == 443)
                link = string.Format("{2}://{1}/Account/Activate/?userId={0}", userId, HttpContext.Current.Request.Url.Host, HttpContext.Current.Request.Url.Scheme);
            else
                link = string.Format("{3}://{1}:{2}/Account/Activate/?userId={0}",
                    userId,
                    HttpContext.Current.Request.Url.Host,
                    HttpContext.Current.Request.Url.Port, HttpContext.Current.Request.Url.Scheme);
            if (isSSO)
            {
                if (HttpContext.Current.Request.Url.Port == 80 || HttpContext.Current.Request.Url.Port == 443)
                    link = string.Format("{1}://{0}/", HttpContext.Current.Request.Url.Host, HttpContext.Current.Request.Url.Scheme);
                else
                    link = string.Format("{2}://{0}:{1}/",
                        HttpContext.Current.Request.Url.Host,
                        HttpContext.Current.Request.Url.Port, HttpContext.Current.Request.Url.Scheme);
            }
            text = text.Replace("{{user_name}}", userName);
            text = text.Replace("{{activation_link}}", link);
            text = text.Replace("{{new_line}}", Environment.NewLine);

            SendMessage(subject, email, text);
        }
        public static void SendRestorePasswordMessage(string email, Guid token, string userName)
        {
            string text = RESTORE_PASSWORD_MESSAGE_BODY;

            string link;
            if (HttpContext.Current.Request.Url.Port == 80 || HttpContext.Current.Request.Url.Port == 443)
                link = string.Format("{2}://{1}/Account/RestorePassword/?token={0}", token, HttpContext.Current.Request.Url.Host, HttpContext.Current.Request.Url.Scheme);
            else
                link = string.Format("{3}://{1}:{2}/Account/RestorePassword/?token={0}", token, HttpContext.Current.Request.Url.Host,
                    HttpContext.Current.Request.Url.Port, HttpContext.Current.Request.Url.Scheme);
            var ttl = Settings.Default.ForgotPasswordLinkTTLDays * 24; // time to live in hours instead of days

            text = text.Replace("{{user_name}}", userName);
            text = text.Replace("{{activation_link}}", link);
            text = text.Replace("{{new_line}}", Environment.NewLine);
            text = text.Replace("{{TTL}}", ttl.ToString());

            SendMessage(RESTORE_PASSWORD_MESSAGE_SUBJECT, email, text);
        }

        public static void SendMessage(string subject, string emailTo, string text)
        {
            var recipient = Settings.Default.IsEmailTestMode ? Settings.Default.TestEmailAddress : emailTo;
            var message = new MailMessage("support@prevuplan.com", recipient, subject, text);
            using (var client = new SmtpClient())
            {
                client.Send(message);
                client.Dispose();
            }

        }
        
        public static void SendMessageHtml(string subject, string emailTo, string text, string fromAddress)
        {
            try
            {
                System.Threading.Thread t = new System.Threading.Thread(() => SendMessageHtmlThread(subject, emailTo, text, fromAddress));
                t.Start();
            }
            catch (Exception dds) { LogException(dds); }
        }
        public static void SendMessageHtmlThread(string subject, string emailTo, string text, string fromAddress )
        {
            MailMessage message = null;
            var recipient = emailTo;
            var MessageID = Guid.NewGuid();
            try {
                recipient = Settings.Default.IsEmailTestMode ? Settings.Default.TestEmailAddress : emailTo;
            }
            catch (Exception)
            {
               
            }
            if (Settings.Default.IsEmailTestMode)
                text += "<br/><br/> this is a test email! the original recipient is:" + emailTo;
            try
            {
                message = new MailMessage(fromAddress, recipient, subject, text);
                message.IsBodyHtml = true;
                using (var client = new SmtpClient())
                {
                    client.Send(message);
                    client.Dispose();
                }

               

            }
            catch (Exception dds)
            {
                LogException(dds);
               
            }
        }
        public static void LogException(Exception ex)
        {
            var sb = new StringBuilder();
            sb.AppendLine(string.Format("{0}: {1}", ex.GetType(), ex.Message));
            sb.AppendLine(ex.StackTrace);

            var innerCount = 0;
            var innerEx = ex;
            while (innerEx.InnerException != null && innerCount++ < Constants.MAX_INNER_EXCEPTION_LOG_LEVEL)
            {
                if (innerEx.Message != innerEx.InnerException.Message)
                    sb.AppendLine("Inner Exception Message: " + innerEx.InnerException.Message);
                innerEx = innerEx.InnerException;
            }
            var dbEntityValidationException = ex as DbEntityValidationException;
            if (dbEntityValidationException != null)
            {
                foreach (var validationErrors in dbEntityValidationException.EntityValidationErrors)
                {
                    foreach (var validationError in validationErrors.ValidationErrors)
                    {
                        sb.AppendFormat("Property: {0} Error: {1}", validationError.PropertyName,
                            validationError.ErrorMessage);

                    }
                }
                sb.AppendLine(dbEntityValidationException.StackTrace);
            }
            if (System.Web.HttpContext.Current != null)
            {
                sb.AppendLine();
                sb.AppendLine(string.Format("URL: {0}", System.Web.HttpContext.Current.Request.Url));
                sb.AppendLine(string.Format("Referrer: {0}", System.Web.HttpContext.Current.Request.UrlReferrer));
                sb.AppendLine(string.Format("QueryString: {0}", System.Web.HttpContext.Current.Request.QueryString));
                sb.AppendLine(string.Format("UserHostAddress: {0}", System.Web.HttpContext.Current.Request.UserHostAddress));
                sb.AppendLine(string.Format("UserAgent: {0}", System.Web.HttpContext.Current.Request.UserAgent));
                if (System.Web.HttpContext.Current.Request.Form.Count > 0)
                {
                    sb.AppendLine();
                    sb.AppendLine("Form:");
                    foreach (string key in System.Web.HttpContext.Current.Request.Form.Keys)
                    {
                        sb.AppendLine(string.Format("{0}: {1}", key, System.Web.HttpContext.Current.Request.Form[key]));
                    }
                }
            }

            // log error using NLog
            Logger.Fatal(sb.ToString());
        }
    }
}