///////////////////////////////////////////////////////////
//  Bool.cs
//  Implementation of Class DBInfo
//  CSLA type: Read-only object
//  Created on: 26-Dec-2008
//  Object design: John 
//	Coded: John 26-Dec-2008
///////////////////////////////////////////////////////////

using System;
using System.Data;
using CSLA.Data;
using GZTW.Data;
using CSLA;
using System.Threading;
using CSLA.Security;
using System.ComponentModel;



namespace GZTW.AyaNova.BLL 
{
	/// <summary>
	/// Retrieves useful info about the database server
	/// </summary>
	[Serializable]
	public class DBInfo : ReadOnlyBase //case 570
    {
#pragma warning disable 1591
        #region Attributes
        private string mVersion;

        /// <summary>
        /// Database server version
        /// </summary>
        public string Version
        {
            get { return mVersion; }
            
        }
        private string mDBServerType;

        /// <summary>
        /// Database server type
        /// </summary>
        public string DBServerType
        {
            get { return mDBServerType; }
           
        }

        private string _FingerPrint;
        /// <summary>
        /// Fingerprint of database schema
        /// used to determine schema corruption
        /// or 3rd party changes to the schema
        /// </summary>
        public string FingerPrint
        {
            get { return _FingerPrint; }
            set { _FingerPrint = value; }
        }

		#endregion

		#region Constructor	

		/// <summary>
		/// Private constructor to prevent direct instantiation
		/// </summary>
		private DBInfo()
		{			
		
		}
		#endregion		

		#region Static methods
		

		

		public static DBInfo GetInfo()
		{
					
			return (DBInfo)DataPortal.Fetch(new Criteria());
			
		}

		
		#endregion

		#region DAL DATA ACCESS
		/// 
		/// <param Bool="Criteria"></param>
		protected override void DataPortal_Fetch(object Criteria)
		{		
			Criteria crit = (Criteria)Criteria;
            string q = "";
            try
            {
                #region server type and version
                DataBaseType currentdbtype = DBUtil.DB.DBType;

                if (currentdbtype == DataBaseType.MSSQL)
                {
                    q = "select SERVERPROPERTY('PRODUCTVERSION')";
                    mDBServerType = "MSSQL";
                    mVersion = System.Convert.ToString(DBUtil.GetScalarFromSQLString(q));
              
                }

                else if (currentdbtype == DataBaseType.FireBird)
                {
                    q = "SELECT rdb$get_context('SYSTEM', 'ENGINE_VERSION') from rdb$database";
                    mDBServerType = "FireBird";

                    //case 1082, apparently the above doesnt' query the server itself, it checks variables stored in the database
                    //so unless the db was created with FB 2.x tools it will barf when the query is run which is trouble for AyaNova
                    //3.x people updating.

                    //since this is buggy, I'm removing it for now entirely as there is no consistent safe way to check the db server
                    //version, the thrust of this was more aimed at SQL server anyway.
                    mVersion = "Unknown";
                    //try
                    //{
                    //    mVersion = System.Convert.ToString(DBUtil.GetScalarFromSQLString(q));

                    //}
                    //catch (Exception ex)
                    //{
                    //    mVersion = "unknown";
                    //}
                }
                
                
               
                #endregion server type and version

                #region fingerprint
                _FingerPrint = DBUtil.DB.SchemaFingerPrint;
               
                //if (currentdbtype == DataBaseType.FireBird)
                //{
                //    using (IDbConnection cn = DBUtil.DB.GetConnection())
                //    {
                //        cn.Open();
                //    }
                //    try
                //    {
                        
                //    }
                //    catch (Exception ex)
                //    {
                //        FingerPrint = "Error: " + ex.Message;
                //        throw;
                //    }
                //    finally
                //    {
                //        if (cn != null)
                //            cn.Close();
                //    }

                   
                //}
                //else if (currentdbtype == DataBaseType.MSSQL)
                //{
                //    //q = "select SERVERPROPERTY('PRODUCTVERSION')";
                //    _FingerPrint = "blah";
                //}
                #endregion

            }
            catch (Exception ex)
            {
                mVersion = "Error: Can't retrieve database server version, likely an old unsupported version, error was:\r\n " + ex.Message;
            }
            			
		}

		
		
		#endregion			

		#region criteria
		/// <summary>
		/// Criteria for identifying existing object
		/// </summary>
		[Serializable]
			private class Criteria
		{
			 
			//public Guid ReportID;

			public Criteria( /*Guid _ReportID*/)
			{
				//ReportID=_ReportID;

				
			}
			
		}
		#endregion

#pragma warning restore 1591
    }//end class

}//end namespace GZTW.AyaNova.BLL