using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Configuration;
using System.Net.Mail;
using System.Text;
using System.Threading.Tasks;
using System.Web.Configuration;

namespace Sevomin.Models.Helpers
{
    public enum EmailType
    {
        EmailConfirmation,
        PasswordReset,
        NewPassword,
        NewApplication,
        NewJob,
        ExpiringJob
    }

    public class SevominEmailer
    {
        public Dictionary<string, string> Parameters { get; set; }
        public EmailType EmailType { get; set; }
        private string EmailFolderPath;
        private string EmailConfirmationFilePath;        
        private string PasswordResetFilePath;
        private string ExpiringJobFilePath;
        private string NewJobFilePath;
        private string NewApplicationFilePath;
        public SevominEmailer()
        {
            EmailFolderPath = Path.Combine(System.Web.HttpContext.Current.Server.MapPath("~/app_data"), "emails");
            if (!Directory.Exists(EmailFolderPath))
                throw new ApplicationException("Emails folder does not exist in the right address.");
            EmailConfirmationFilePath = Path.Combine(EmailFolderPath, "email-confirmation.html");            
            PasswordResetFilePath = Path.Combine(EmailFolderPath, "password-reset.html");
            ExpiringJobFilePath = Path.Combine(EmailFolderPath, "expiring-job.html");
            NewJobFilePath = Path.Combine(EmailFolderPath, "new-job.html");
            NewApplicationFilePath = Path.Combine(EmailFolderPath, "new-application.html");
            if(!File.Exists(EmailConfirmationFilePath))
                throw new ApplicationException("Email confirmation template does not exist in the right address.");            
            if (!File.Exists(PasswordResetFilePath))
                throw new ApplicationException("Password reset template does not exist in the right address.");
            if (!File.Exists(ExpiringJobFilePath))
                throw new ApplicationException("Expiring job template does not exist in the right address.");
            if (!File.Exists(NewJobFilePath))
                throw new ApplicationException("New job template does not exist in the right address.");
            if (!File.Exists(NewApplicationFilePath))
                throw new ApplicationException("New application template does not exist in the right address.");
            Parameters = new Dictionary<string, string>();
        }
        public SevominEmailer(Dictionary<string, string> parameters, EmailType emailType) : this()
        {
            Parameters = parameters;
            EmailType = emailType;
        }

        public async Task SendAsync(string to, bool isHtml, bool optedOut)
        {
            SmtpClient client = new SmtpClient();
            MailMessage msg = new MailMessage();

            string template;
            switch (EmailType)
            {
                case EmailType.EmailConfirmation:
                    template =
                        File.ReadAllText(EmailConfirmationFilePath, Encoding.UTF8);
                    msg.Subject = "تایید عضویت";
                    break;
                case EmailType.PasswordReset:
                    template =
                        File.ReadAllText(PasswordResetFilePath, Encoding.UTF8);
                    msg.Subject = "بازیابی رمز عبور";
                    break;
                case EmailType.ExpiringJob:
                    template =
                        File.ReadAllText(ExpiringJobFilePath, Encoding.UTF8);
                    msg.Subject = "اتمام اعتبار آگهی";
                    break;
                case EmailType.NewApplication:
                    template =
                        File.ReadAllText(NewApplicationFilePath, Encoding.UTF8);
                    msg.Subject = "آمادگی جدید";
                    break;
                case EmailType.NewJob:
                    template =
                        File.ReadAllText(NewJobFilePath, Encoding.UTF8);
                    msg.Subject = "آگهی استخدام جدید";
                    break;
                default:
                    template = string.Empty;
                    msg.Subject = string.Empty;
                    break;
            }

            if (!optedOut)
            {
                foreach (var address in to.Split(','))
                    msg.To.Add(address);
                //msg.Bcc.Add("[email protected]");
                Func<string> getBody = () =>
                {
                    foreach (var param in Parameters)
                        template = template.Replace(string.Format("[{0}]", param.Key), param.Value);

                    return template;
                };

                msg.Body = getBody();

                msg.From = new MailAddress("[email protected]");

                msg.SubjectEncoding = Encoding.UTF8;
                msg.BodyEncoding = Encoding.UTF8;

                msg.IsBodyHtml = isHtml;

                client.Port = 587;
                client.Credentials = new System.Net.NetworkCredential("[email protected]", "4XdWMRVFBO-pow4I1md1Bw");
                client.EnableSsl = true;

                await Task.Run(() =>
                {
                    client.Send(msg);
                });
            }
        }
    }
}