/**
 *    Copyright (C) 2017 MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#include "mongo/platform/basic.h"

#include "mongo/db/client.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/db/service_context_d_test_fixture.h"
#include "mongo/db/session_catalog.h"
#include "mongo/stdx/future.h"
#include "mongo/stdx/memory.h"
#include "mongo/unittest/unittest.h"

namespace mongo {
namespace {

class SessionCatalogTest : public ServiceContextMongoDTest {
protected:
    void setUp() final {
        ServiceContextMongoDTest::setUp();
        SessionCatalog::create(getServiceContext());
    }

    void tearDown() final {
        SessionCatalog::reset_forTest(getServiceContext());
        ServiceContextMongoDTest::tearDown();
    }
};

TEST_F(SessionCatalogTest, CheckoutAndReleaseSession) {
    auto opCtx = Client::getCurrent()->makeOperationContext();
    opCtx->setLogicalSessionId(LogicalSessionId());

    auto scopedSession = SessionCatalog::get(opCtx.get())->checkOutSession(opCtx.get());

    ASSERT(scopedSession.get());
    ASSERT_EQ(*opCtx->getLogicalSessionId(), scopedSession->getSessionId());
}

TEST_F(SessionCatalogTest, OperationContextSession) {
    auto opCtx = Client::getCurrent()->makeOperationContext();
    opCtx->setLogicalSessionId(LogicalSessionId());

    {
        OperationContextSession ocs(opCtx.get());
        auto session = OperationContextSession::get(opCtx.get());

        ASSERT(session);
        ASSERT_EQ(*opCtx->getLogicalSessionId(), session->getSessionId());
    }

    ASSERT(!OperationContextSession::get(opCtx.get()));
}

TEST_F(SessionCatalogTest, GetOrCreateNonExistentSession) {
    auto opCtx = Client::getCurrent()->makeOperationContext();

    const LogicalSessionId lsid;
    auto scopedSession = SessionCatalog::get(opCtx.get())->getOrCreateSession(opCtx.get(), lsid);

    ASSERT(scopedSession.get());
    ASSERT_EQ(lsid, scopedSession->getSessionId());
}

TEST_F(SessionCatalogTest, GetOrCreateSessionAfterCheckOutSession) {
    const LogicalSessionId lsid;

    auto opCtx = Client::getCurrent()->makeOperationContext();
    opCtx->setLogicalSessionId(lsid);

    boost::optional<OperationContextSession> ocs(opCtx.get());

    stdx::async(stdx::launch::async, [&] {
        Client::initThreadIfNotAlready();
        auto sideOpCtx = Client::getCurrent()->makeOperationContext();
        auto scopedSession =
            SessionCatalog::get(sideOpCtx.get())->getOrCreateSession(sideOpCtx.get(), lsid);

        ASSERT(scopedSession.get());
        ASSERT_EQ(lsid, scopedSession->getSessionId());
    }).get();

    ocs.reset();

    stdx::async(stdx::launch::async, [&] {
        Client::initThreadIfNotAlready();
        auto sideOpCtx = Client::getCurrent()->makeOperationContext();
        auto scopedSession =
            SessionCatalog::get(sideOpCtx.get())->getOrCreateSession(sideOpCtx.get(), lsid);

        ASSERT(scopedSession.get());
        ASSERT_EQ(lsid, scopedSession->getSessionId());
    }).get();
}

TEST_F(SessionCatalogTest, NestedOperationContextSession) {
    auto opCtx = Client::getCurrent()->makeOperationContext();
    opCtx->setLogicalSessionId(LogicalSessionId());

    {
        OperationContextSession outerScopedSession(opCtx.get());

        {
            OperationContextSession innerScopedSession(opCtx.get());
            auto session = OperationContextSession::get(opCtx.get());
            ASSERT_TRUE(nullptr != session);
            ASSERT_EQ(*opCtx->getLogicalSessionId(), session->getSessionId());
        }

        auto session = OperationContextSession::get(opCtx.get());
        ASSERT_TRUE(nullptr != session);
        ASSERT_EQ(*opCtx->getLogicalSessionId(), session->getSessionId());
    }

    ASSERT_TRUE(nullptr == OperationContextSession::get(opCtx.get()));
}

}  // namespace
}  // namespace mongo