#region License

/*
 * Copyright © 2002-2007 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#endregion

#region Imports

using System;
using NHibernate;
using NUnit.Framework;
using Rhino.Mocks;

#endregion

namespace Spring.Data.NHibernate.Support
{
    /// <summary>
    /// Tests <see cref="SessionScopeSettings"/> functionality.
    /// </summary>
    /// <author>Erich Eichinger</author>
    [TestFixture]
    public class SessionScopeSettingsTests
    {
        private class DerivedSessionScopeSettings : SessionScopeSettings
        {
            public DerivedSessionScopeSettings()
                :base() // note, that we're calling default ctor here
            {
            }
        }

        private class LazyResolvingSessionScopeSettings : SessionScopeSettings
        {
            private readonly ISessionFactory sessionFactory;
            private readonly IInterceptor entityInterceptor;


            public LazyResolvingSessionScopeSettings(ISessionFactory sessionFactory, IInterceptor entityInterceptor)
                : base() // note, that we're calling default ctor here
            {
                this.sessionFactory = sessionFactory;
                this.entityInterceptor = entityInterceptor;
            }

            protected override ISessionFactory ResolveSessionFactory()
            {
                // simulates lazy resolving
                return this.sessionFactory;
            }

            protected override IInterceptor ResolveEntityInterceptor()
            {
                // simulates lazy resolving
                return this.entityInterceptor;
            }
        }

        [Test]
        public void CheckDefaults()
        {
            Assert.IsTrue( SessionScopeSettings.SINGLESESSION_DEFAULT );
            Assert.AreEqual( FlushMode.Never, SessionScopeSettings.FLUSHMODE_DEFAULT );
        }

        [Test]
        public void WorksAsExpected()
        {
            MockRepository mocks = new MockRepository();
            ISessionFactory sessionFactory =  (ISessionFactory) mocks.CreateMock(typeof(ISessionFactory));
            IInterceptor entityInterceptor = (IInterceptor) mocks.CreateMock(typeof(IInterceptor));
            Assert.AreNotEqual( FlushMode.Auto, SessionScopeSettings.FLUSHMODE_DEFAULT ); // ensure noone changed our assumptions
            SessionScopeSettings sss = new SessionScopeSettings(sessionFactory, entityInterceptor, !SessionScopeSettings.SINGLESESSION_DEFAULT, FlushMode.Auto );   

            Assert.AreEqual( sessionFactory, sss.SessionFactory );
            Assert.AreEqual( entityInterceptor, sss.EntityInterceptor);
            Assert.AreEqual( !SessionScopeSettings.SINGLESESSION_DEFAULT, sss.SingleSession );
            Assert.AreEqual( FlushMode.Auto, sss.DefaultFlushMode );
        }

        [Test]
        public void CallingDefaultConstructorLeavesReferencesMarkedUninitialized()
        {
            DerivedSessionScopeSettings sss = new DerivedSessionScopeSettings();
            // config values are set to their defaults
            Assert.AreEqual(SessionScopeSettings.SINGLESESSION_DEFAULT, sss.SingleSession);
            Assert.AreEqual(SessionScopeSettings.FLUSHMODE_DEFAULT, sss.DefaultFlushMode);

            IInterceptor interceptor = sss.EntityInterceptor;
            Assert.IsNull(interceptor);

            try
            {
                ISessionFactory sessionFactory = sss.SessionFactory;
                Assert.Fail("should fail, because derived classes must override ResolveSessionFactory()");
            }
            catch (NotImplementedException) { }
        }

        [Test]
        public void CallingDefaultConstructorCausesLazyResolvingReferences()
        {
            MockRepository mocks = new MockRepository();
            ISessionFactory expectedSessionFactory = (ISessionFactory)mocks.CreateMock(typeof(ISessionFactory));
            IInterceptor expectedEntityInterceptor = (IInterceptor)mocks.CreateMock(typeof(IInterceptor));

            SessionScopeSettings sss = new LazyResolvingSessionScopeSettings(expectedSessionFactory, expectedEntityInterceptor);

            // config values are set to their defaults
            Assert.AreEqual(SessionScopeSettings.SINGLESESSION_DEFAULT, sss.SingleSession);
            Assert.AreEqual(SessionScopeSettings.FLUSHMODE_DEFAULT, sss.DefaultFlushMode);

            Assert.AreSame(expectedSessionFactory, sss.SessionFactory);
            Assert.AreSame(expectedEntityInterceptor, sss.EntityInterceptor);
        }

        [Test]
        [ExpectedException(typeof(ArgumentException))]
        public void MissingSessionFactoryCausesArgumentExceptionDuringLazyResolving()
        {
            SessionScopeSettings sss = new LazyResolvingSessionScopeSettings(null, null);

            // config values are set to their defaults
            Assert.AreEqual(SessionScopeSettings.SINGLESESSION_DEFAULT, sss.SingleSession);
            Assert.AreEqual(SessionScopeSettings.FLUSHMODE_DEFAULT, sss.DefaultFlushMode);

            ISessionFactory sessionFactory = sss.SessionFactory;
        }

        [Test]
        public void MissingEntityInterceptorIsOkDuringLazyResolving()
        {
            MockRepository mocks = new MockRepository();
            ISessionFactory expectedSessionFactory = (ISessionFactory)mocks.CreateMock(typeof(ISessionFactory));

            SessionScopeSettings sss = new LazyResolvingSessionScopeSettings(expectedSessionFactory, null);

            // config values are set to their defaults
            Assert.AreEqual(SessionScopeSettings.SINGLESESSION_DEFAULT, sss.SingleSession);
            Assert.AreEqual(SessionScopeSettings.FLUSHMODE_DEFAULT, sss.DefaultFlushMode);

            Assert.AreSame(expectedSessionFactory, sss.SessionFactory);
            Assert.AreSame(null, sss.EntityInterceptor);
        }

    }
}