using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using NHibernate;

namespace Tanshu.Accounts.Repository
{
    public class FluentGenericBase<T> : IDisposable, IRepository<T> where T : class
    {
        protected readonly bool DisposeSession;
        protected readonly ISession Session;
        protected readonly ITransaction Transaction;

        public FluentGenericBase()
        {
            Session = SessionManager.Session;
            DisposeSession = true;
            Transaction = Session.BeginTransaction();

        }
        public FluentGenericBase(bool beginTransaction)
        {
            Session = SessionManager.Session;
            DisposeSession = true;
            if (beginTransaction)
                Transaction = Session.BeginTransaction();
        }
        public FluentGenericBase(ISession session)
        {
            this.Session = session;
            DisposeSession = false;
        }
        public FluentGenericBase(ISession session, bool beginTransaction)
        {
            this.Session = session;
            DisposeSession = false;
            if (beginTransaction)
                Transaction = Session.BeginTransaction();
        }

        #region IDisposable Members
        public void Dispose()
        {
            if (Transaction != null)
            {
                Transaction.Commit();
                Transaction.Dispose();
            }
            if (DisposeSession && Session != null)
                Session.Dispose();
        }
        //public void Dispose()
        //{
        //    Dispose(true);
        //    GC.SuppressFinalize(this);
        //}

        //protected virtual void Dispose(bool disposing)
        //{
        //    if (Transaction != null)
        //    {
        //        Transaction.Commit();
        //        Transaction.Dispose();
        //    }
        //    if (DisposeSession && Session != null)
        //        Session.Dispose();

        //    if (disposing)
        //    {
        //        // get rid of managed resources
        //    }
        //    // get rid of unmanaged resources
        //}
        //~FluentGenericBase()
        //{
        //    Dispose(false);
        //}
        #endregion

        #region IRepository<T> Members

        public void Insert(T item)
        {
            Session.Save(item);
        }

        public void Update(T item)
        {
            Session.Update(item);
        }

        public void Delete(T item)
        {
            Session.Delete(item);
        }

        public void Delete(Expression<Func<T, bool>> query)
        {
            Delete(Get(query));
        }

        public void DeleteList(Expression<Func<T, bool>> query)
        {
            foreach (T item in List(query))
                Delete(item);
        }

        public T Get(Expression<Func<T, bool>> query)
        {
            return Session.QueryOver<T>()
                .Where(query)
                .SingleOrDefault();
        }

        public IList<T> List()
        {
            return Session.CreateCriteria<T>()
                .List<T>();
        }

        public IList<T> List(Expression<Func<T, bool>> query)
        {
            return Session.QueryOver<T>()
                .Where(query)
                .List();
        }

        public void DeleteList(IList<T> list)
        {
            foreach (T item in list)
                Delete(item);
        }

        public IQueryOver<T, T> Query()
        {
            return Session.QueryOver<T>();
        }
        #endregion
    }
}