///
/// Copyright (c) 2013-2018 Sensus Slovensko a.s.
///
using System;
using System.Windows.Forms;
using FluentNHibernate.Cfg;
using FluentNHibernate.Cfg.Db;
using NHibernate;
using NHibernate.Cfg;
using NHibernate.Tool.hbm2ddl;
using Config.Resources;

namespace Config
{
    public static class FluentCommon
    {
		/// <summary>
		/// Session factories for regular sessions.
		/// </summary>
		public static ISessionFactory[] SessionFactories = new ISessionFactory[(int)Users.Entities.DBKind.Count];

        /// <summary>
        /// NHibernate session factory (to create the database session 'SessionFactory')
        /// </summary>
        /// <returns>A database session</returns>
        static ISessionFactory CreateSessionFactory(Users.Entities.DBKind database)
        {
            Users.Entities.DBType dbType;
            string connectionString;

			switch (database)
			{
                default:
                case Users.Entities.DBKind.Config:
					dbType = Data.CurrentBench.ProceduresDBSettings.DbType;
					connectionString = Data.CurrentBench.ProceduresDBSettings.ConnectionString;
                    break;
                case Users.Entities.DBKind.Results:
					dbType = Data.CurrentBench.WaterMetersDBSettings.DbType;
					connectionString = Data.CurrentBench.WaterMetersDBSettings.ConnectionString;
                    break;
                case Users.Entities.DBKind.RemoteConfig:
                    dbType = Data.CurrentBench.UsersDBSettings.DbType;
                    connectionString = Data.CurrentBench.UsersDBSettings.ConnectionString;
                    break;
            }

            return CreateSessionFactory(database, dbType, connectionString, false);
		}

        /// <summary>
        /// NHibernate session factory (to create the database session 'SessionFactory')
        /// </summary>
        /// <returns>A database session</returns>
		public static ISessionFactory CreateSessionFactory(Users.Entities.DBKind database, Users.Entities.DBType dbType, string connectionString, bool createDB)
        {
			try
			{
                FluentConfiguration cfg = Fluently.Configure();

                switch (dbType)
				{
					default:
                    case Users.Entities.DBType.SQLite:
						cfg = cfg.Database(SQLiteConfiguration.Standard.UsingFile(connectionString));
                        break;
                    case Users.Entities.DBType.MySql:
                        cfg = cfg.Database(MySQLConfiguration.Standard.ConnectionString(connectionString));
                        break;
				}

                switch (database)
                {
                    default:
					case Users.Entities.DBKind.Config:
                    case Users.Entities.DBKind.RemoteConfig:
                        cfg = cfg.Mappings(m => m.FluentMappings.AddFromAssemblyOf<Data>());
                        break;
                    case Users.Entities.DBKind.Results:
                        cfg = cfg.Mappings(m => m.FluentMappings.AddFromAssemblyOf<Data>());
                        break;
                }

                if (createDB)
                {
                    return cfg.ExposeConfiguration(BuildSchemaCreate).BuildSessionFactory();
                }
                else
                {
                    return cfg.ExposeConfiguration(BuildSchema).BuildSessionFactory();
                }
			}
			catch (Exception exc)
			{
				MessageBox.Show(string.Format(Strings.Cannot_open_DB_Cause_0, exc.Message),
								Strings.Error,
								MessageBoxButtons.OK,
								MessageBoxIcon.Error);
				return null;
			}
        }

        public delegate void BuildSchemaDlgt(Configuration config);

        static void BuildSchema(Configuration config)
        {
            /// This NHibernate tool takes a configuration (with mapping info in)
            /// and exports a database schema from it
            new SchemaExport(config).SetOutputFile("db_schema");
        }

        static void BuildSchemaCreate(Configuration config)
        {
            /// This NHibernate tool takes a configuration (with mapping info in)
            /// and exports a database schema from it
            new SchemaExport(config).Create(true, true);
        }

		/// Create a NHibernate session for the given database
		public static ISession CreateSession(Users.Entities.DBKind database)
		{
            if (database < 0 || database >= Users.Entities.DBKind.Count) return null;

            int ix = (int)database;
            if (SessionFactories[ix] == null) SessionFactories[ix] = CreateSessionFactory(database);

			return SessionFactories[ix].OpenSession();
		}

        /// <summary>
        /// Create an empty users database.
		/// Database contains only the user 'admin' and the control board component 'CB'.
        /// </summary>
        /// <param name="dbType">DBType.SQLite or DBType.MySql</param>
        /// <param name="connectionString">Connection string</param>
        /// <returns>true=success, false=error</returns>
		public static bool CreateEmptyConfigDB(Users.Entities.DBType dbType, string connectionString)
		{
			ISessionFactory sessionFactory = CreateSessionFactory(Users.Entities.DBKind.Config, dbType, connectionString, true);
			if (sessionFactory == null) return false;

            /// Populate the database
            using (var session = sessionFactory.OpenSession())
            {
                using (var transaction = session.BeginTransaction())
                {
                    ///
					/// Create user 'admin'
                    ///
                    var admin = new Config.Entities.User
                    {
						UserName = Data.AdminUsername,
                        FullName = Strings.Administrator,
                        LastPwChange = DateTime.Now
                    };
					admin.SetPassword(Data.AdminPassword);

                    ///
                    /// Prepare all groups, add some of them to admin
                    ///
                    for (Users.Entities.GID gid = 0; gid < Users.Entities.GID.NrOfGroups; gid++)
                    {
                        Config.Entities.Group group = new Config.Entities.Group(gid);
                        switch (gid)
                        {
                            case Users.Entities.GID.Testers:
                            case Users.Entities.GID.TestingSpecialists:
                            case Users.Entities.GID.HeadOfLab:
                            case Users.Entities.GID.MaintenanceSpecialists:
                            case Users.Entities.GID.Metrologists:
                            case Users.Entities.GID.CalibrationSpecialists:
                            case Users.Entities.GID.Administrators:
#if TURA_IPERL || TURA_IPERL_NEW || TURA_SPECIAL
                            case Users.Entities.GID.TraceabilityManagement:
#elif KEMPNO_50 || KRAKOW_50 || TORUN_50 || WARSAW_END
                            case Users.Entities.GID.MetrologicalAuthority:
                            case Users.Entities.GID.WaterMeterAuthority:
#endif
                                admin.AddGroup(group);
                                session.SaveOrUpdate(group);    /// Save this group
                                break;
                        }
                    }

                    session.SaveOrUpdate(admin);                /// Save user 'admin'
                    transaction.Commit();
                }
            }

            return true;
        }
    }
}