using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using EgtBEAMWALL.DataLayer.DatabaseModels;

namespace EgtBEAMWALL.DataLayer.Controllers
{
   public class DbController : IDisposable
   {
      #region Private Fields

      private AdminContext adbCtx;

      #endregion Private Fields

      #region Public Fields

      /// <summary>
      /// Singleton gestione
      /// </summary>
      public static DbController man = new DbController();

      #endregion Public Fields

      #region Public Constructors

      public DbController()
      {
         // Initialize database context for ADMIN
         adbCtx = new AdminContext(DbConfig.ADMIN_CONNECTION_STRING);
      }

      #endregion Public Constructors

      #region Public Methods

      public bool checkCreateUser(string username, string pwd)
      {
         bool answ = false;
         // ricerca utente...
         var numUser = adbCtx
             .UserList
             .Where(x => x.User == username)
             .ToList()
             .Count;
         if (numUser > 0)
         {
            answ = true;
         }
         if (!answ)
         {
            // creo utente
            string sqlCommand = "FLUSH PRIVILEGES;";
            //string sqlCommand = $"CREATE USER '{username}'@'localhost' IDENTIFIED BY '{pwd}'; GRANT ALL ON *.* TO '{username}'@'localhost'; FLUSH PRIVILEGES;";
            //string sqlCommand = $"CREATE USER '{username}'@'localhost' IDENTIFIED BY '{pwd}'; GRANT ALL ON *.* TO '{username}'@'localhost'; FLUSH PRIVILEGES;";
            adbCtx.Database.ExecuteSqlCommand(System.Data.Entity.TransactionalBehavior.DoNotEnsureTransaction, sqlCommand);
            sqlCommand = $"CREATE USER '{username}'@'localhost' IDENTIFIED BY '{pwd}';";
            adbCtx.Database.ExecuteSqlCommand(System.Data.Entity.TransactionalBehavior.DoNotEnsureTransaction, sqlCommand);
            sqlCommand = $"GRANT ALL ON *.* TO '{username}'@'localhost';";
            adbCtx.Database.ExecuteSqlCommand(System.Data.Entity.TransactionalBehavior.DoNotEnsureTransaction, sqlCommand);
            sqlCommand = "FLUSH PRIVILEGES;";
            adbCtx.Database.ExecuteSqlCommand(System.Data.Entity.TransactionalBehavior.DoNotEnsureTransaction, sqlCommand);
         }
         return answ;
      }

      public void Dispose()
      {
         // Clear database context
         adbCtx.Dispose();
      }

      public bool ResetDb()
      {
         bool answ = false;

         try
         {
            adbCtx
                .Database
                .SqlQuery<int>("CALL stp_ResetDb()");
            answ = true;

            adbCtx.SaveChanges();
         }
         catch (Exception exc)
         {
            Console.WriteLine($"EXCEPTION on ResetDb: {exc}");
         }

         return answ;
      }

      #endregion Public Methods
   }
}