using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;
using System.Data;

namespace Payroll.BO
{
    public class UtilsService 
    {
        public UtilsService() { }

        public void BackupDatabase(string filepath)
        {
            ETransactionContext tc = new ETransactionContext();
            try
            {
                tc.Begin();
                for (int i = 0; i <= 3; i++)
                {
                    try
                    {
                        UtilsDA.BackupDatabase(tc, tc.Connection.DataBase, filepath);
                        break;
                    }
                    catch (Exception ex)
                    {
                        if (i == 3) throw new Exception(ex.Message);
                    }

                }
                tc.End();
            }
            catch(Exception e)
            {
                #region Handle Exception
                if (tc != null)
                    tc.HandleError();
                throw new Exception(e.Message);
                #endregion
            }
        }

        public ArrayList GetDatabases()
        {
            ArrayList dbList=new ArrayList();
            ETransactionContext tc = new ETransactionContext();
            try
            {
                tc.Begin();
                IDataReader oReader = UtilsDA.GetDatabases(tc);
                NullHandler oreader = new NullHandler(oReader);
                while (oReader.Read())
                {
                    dbList.Add(oreader.GetString(0));
                    
                }
                tc.End();
            }
            catch (Exception e)
            {
                #region Handle Exception
                if (tc != null)
                    tc.HandleError();
                throw new Exception(e.Message);
                #endregion
            }
            return dbList;
        }


        public void RestorDatabase(string dbName, string filepath)
        {
            ETransactionContext tc = new ETransactionContext();
            try
            {
                tc.Begin();
                for (int i = 0; i <= 3; i++)
                {
                    try
                    {
                        UtilsDA.RestorDatabase(tc, dbName, filepath);
                        break;
                    }
                    catch (Exception ex)
                    {
                        if (i == 3) throw new Exception(ex.Message);
                    }
                }
                tc.End();
            }
            catch (Exception e)
            {
                #region Handle Exception
                if (tc != null)
                    tc.HandleError();
                throw new Exception(e.Message);
                #endregion
            }
        }

        public void RestorDatabase(string sDBName, string sBackupFilePath, string sToDataFilePath, string sToLogFilePath)
        {
            ETransactionContext tc = new ETransactionContext();
            try
            {
                tc.Begin();
                if (UtilsDA.IsExist(tc, sDBName)) throw new Exception(sDBName + " already exist.");

                for (int i = 0; i <= 3; i++)
                {
                    try
                    {
                        UtilsDA.RestorDatabase(tc, sDBName, sBackupFilePath, sToDataFilePath, sToLogFilePath);
                        break;
                    }
                    catch (Exception ex)
                    {
                        if (i == 3) throw new Exception(ex.Message);
                    }
                }
                tc.End();
            }
            catch (Exception e)
            {
                #region Handle Exception
                if (tc != null)
                    tc.HandleError();
                throw new Exception(e.Message);
                #endregion
            }
        }

        public void AttachSingleDB(string sFilePath, string sDBName)
        {
            ETransactionContext tc = new ETransactionContext();
            try
            {
                tc.Begin();
                if (UtilsDA.IsExist(tc,sDBName))
                {
                    UtilsDA.RunCMD(tc,SQL.MakeSQL("EXEC sp_detach_db @dbname = %s",sDBName));

                    UtilsDA.RunCMD(tc, SQL.MakeSQL("EXEC sp_attach_single_file_db @dbname = %s, "
                        + " @physname = %s",sDBName,sFilePath));
                }
                else
                {
                    UtilsDA.RunCMD(tc, SQL.MakeSQL("exec sp_attach_single_file_db %s, %s", sDBName, sFilePath));
                }
                tc.End();
            }
            catch (Exception e)
            {
                #region Handle Exception
                if (tc != null)
                    tc.HandleError();
                throw new Exception(e.Message);
                #endregion
            }
           
        }


    }
}