using System;
using NHibernate;
using NHibernate.Cfg;
using Tanshu.Accounts.Entities;
using NHibernate.Mapping.ByCode;
using System.Reflection;
using NHibernate.Tool.hbm2ddl;
using NHibernate.Cfg.MappingSchema;
using System.Data;
using Tanshu.Accounts.Entities.Auth;

namespace Tanshu.Accounts.Repository
{
    public sealed class SessionManager
    {
        private readonly Configuration cfg;
        private readonly ISessionFactory factory;

        private static SessionManager instance;
        private SessionManager(bool forTesting)
        {
            cfg = ConfigureNHibernate(forTesting);
            factory = cfg.BuildSessionFactory();
        }

        public static void Initialize(bool forTesting)
        {
            if (instance == null)
            {
                instance = new SessionManager(forTesting);
            }
        }
        public static ISession Session
        {
            get
            {
                if (instance == null)
                    throw new ApplicationException("Session factory not initalized.  Cannot get Session");
                return instance.GetSession();
            }
        }
        public static IStatelessSession StatelessSession
        {
            get
            {
                if (instance == null)
                    throw new ApplicationException("Session factory not initalized.  Cannot get Session");
                return instance.GetStatelessSession();
            }
        }
        private Configuration ConfigureNHibernate(bool forTesting)
        {
            var configure = new Configuration();
            configure.SessionFactoryName("BuildIt");

            configure.DataBaseIntegration(db =>
            {
                db.Dialect<NHibernate.Dialect.MsSql2005Dialect>();
                db.Driver<NHibernate.Driver.SqlClientDriver>();
                db.KeywordsAutoImport = Hbm2DDLKeyWords.AutoQuote;
                db.IsolationLevel = IsolationLevel.ReadCommitted;
                db.ConnectionStringName = "Con";
                db.Timeout = 10;

                if (forTesting)
                {
                    // enabled for testing
                    db.LogFormattedSql = true;
                    db.LogSqlInConsole = true;
                    db.AutoCommentSql = true;
                }
            });

            var mapping = GetMappings();
            configure.AddDeserializedMapping(mapping, "NHSchemaTest");
            //SchemaMetadataUpdater.QuoteTableAndColumns(configure);
            configure.SetInterceptor(new VoucherDirty());

            var timeout = TimeSpan.FromMinutes(10).TotalSeconds;
            configure.SetProperty("command_timeout", timeout.ToString());
            return configure;
        }
        private static HbmMapping GetMappings()
        {
            var mapper = new ModelMapper();
            var entities = new Type[] { 
                typeof(VoucherMap), 
                typeof(UserMap), 
                typeof(CustomerMap),
                typeof(UserGroupMap),
                typeof(KotMap),
                typeof(ReprintMap),
                typeof(InventoryMap),
                typeof(InventoryModifierMap),
                typeof(GroupMap),
                typeof(RoleGroupMap),
                typeof(ProductMap),
                typeof(ModifierMap),
                typeof(ProductGroupModifierMap),
                typeof(RoleMap),
                typeof(ProductGroupMap),
                typeof(PrintLocationMap),
                typeof(TaxMap),
                typeof(VoucherSettlementMap),
                typeof(FoodTableMap),
                typeof(MachineLocationMap),
                typeof(SettingMap)
            };
            mapper.AddMappings(entities);
            var mapping = mapper.CompileMappingForAllExplicitlyAddedEntities();
            return mapping;
        }

        private ISession GetSession()
        {
            return factory.OpenSession();
        }
        private IStatelessSession GetStatelessSession()
        {
            return factory.OpenStatelessSession();
        }
    }
}