/**
 *    Copyright (C) 2018-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    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
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    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 Server Side 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/catalog/capped_utils.h"
#include "mongo/db/catalog/collection_catalog_entry.h"
#include "mongo/db/client.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/repl/replication_coordinator_mock.h"
#include "mongo/db/repl/storage_interface_impl.h"
#include "mongo/db/service_context_d_test_fixture.h"
#include "mongo/stdx/memory.h"
#include "mongo/unittest/unittest.h"

namespace {

using namespace mongo;

class CappedUtilsTest : public ServiceContextMongoDTest {
private:
    void setUp() override;
    void tearDown() override;

protected:
    // Use StorageInterface to access storage features below catalog interface.
    std::unique_ptr<repl::StorageInterface> _storage;
};

void CappedUtilsTest::setUp() {
    // Set up mongod.
    ServiceContextMongoDTest::setUp();

    auto service = getServiceContext();

    // Set up ReplicationCoordinator and ensure that we are primary.
    auto replCoord = stdx::make_unique<repl::ReplicationCoordinatorMock>(service);
    ASSERT_OK(replCoord->setFollowerMode(repl::MemberState::RS_PRIMARY));
    repl::ReplicationCoordinator::set(service, std::move(replCoord));

    _storage = stdx::make_unique<repl::StorageInterfaceImpl>();
}

void CappedUtilsTest::tearDown() {
    _storage = {};

    // Tear down mongod.
    ServiceContextMongoDTest::tearDown();
}

/**
 * Creates an OperationContext.
 */
ServiceContext::UniqueOperationContext makeOpCtx() {
    return cc().makeOperationContext();
}

/**
 * Returns true if collection exists.
 */
bool collectionExists(OperationContext* opCtx, const NamespaceString& nss) {
    return AutoGetCollectionForRead(opCtx, nss).getCollection() != nullptr;
}

/**
 * Returns collection options.
 */
CollectionOptions getCollectionOptions(OperationContext* opCtx, const NamespaceString& nss) {
    AutoGetCollectionForRead autoColl(opCtx, nss);
    auto collection = autoColl.getCollection();
    ASSERT_TRUE(collection) << "Unable to get collections options for " << nss
                            << " because collection does not exist.";
    auto catalogEntry = collection->getCatalogEntry();
    return catalogEntry->getCollectionOptions(opCtx);
}

// Size of capped collection to be passed to convertToCapped() which accepts a double.
// According to documentation, the size (in bytes) of capped collection must be a minimum of 4096
// and a multiple of 256.
const double cappedCollectionSize = 8192.0;

TEST_F(CappedUtilsTest, ConvertToCappedReturnsNamespaceNotFoundIfCollectionIsMissing) {
    NamespaceString nss("test.t");
    auto opCtx = makeOpCtx();
    ASSERT_FALSE(collectionExists(opCtx.get(), nss));
    ASSERT_EQUALS(ErrorCodes::NamespaceNotFound, convertToCapped(opCtx.get(), nss, 1000.0));
}

TEST_F(CappedUtilsTest, ConvertToCappedUpdatesCollectionOptionsOnSuccess) {
    NamespaceString nss("test.t");

    auto opCtx = makeOpCtx();
    ASSERT_OK(_storage->createCollection(opCtx.get(), nss, {}));
    auto options = getCollectionOptions(opCtx.get(), nss);
    ASSERT_FALSE(options.capped);

    ASSERT_OK(convertToCapped(opCtx.get(), nss, cappedCollectionSize));
    options = getCollectionOptions(opCtx.get(), nss);
    ASSERT_TRUE(options.capped);
    ASSERT_APPROX_EQUAL(cappedCollectionSize, options.cappedSize, 0.001)
        << "unexpected capped collection size: " << options.toBSON();
}

TEST_F(CappedUtilsTest, ConvertToCappedReturnsNamespaceNotFoundIfCollectionIsDropPending) {
    NamespaceString nss("test.t");
    repl::OpTime dropOpTime(Timestamp(Seconds(100), 0), 1LL);
    auto dropPendingNss = nss.makeDropPendingNamespace(dropOpTime);

    auto opCtx = makeOpCtx();
    ASSERT_OK(_storage->createCollection(opCtx.get(), dropPendingNss, {}));
    auto options = getCollectionOptions(opCtx.get(), dropPendingNss);
    ASSERT_FALSE(options.capped);

    ASSERT_EQUALS(ErrorCodes::NamespaceNotFound,
                  convertToCapped(opCtx.get(), dropPendingNss, cappedCollectionSize));
    options = getCollectionOptions(opCtx.get(), dropPendingNss);
    ASSERT_FALSE(options.capped);
}

}  // namespace