/**
 *    Copyright (C) 2015 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/service_context.h"
#include "mongo/db/json.h"
#include "mongo/db/storage/storage_engine_metadata.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_global_options.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_record_store.h"
#include "mongo/db/storage_options.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/mongoutils/str.h"

namespace {

    using namespace mongo;

    class WiredTigerFactoryTest : public mongo::unittest::Test {
    private:
        virtual void setUp() {
            ServiceContext* globalEnv = getGlobalServiceContext();
            ASSERT_TRUE(globalEnv);
            ASSERT_TRUE(getGlobalServiceContext()->isRegisteredStorageEngine(kWiredTigerEngineName));
            std::unique_ptr<StorageFactoriesIterator> sfi(getGlobalServiceContext()->
                                                            makeStorageFactoriesIterator());
            ASSERT_TRUE(sfi);
            bool found = false;
            while (sfi->more()) {
                const StorageEngine::Factory* currentFactory = sfi->next();
                if (currentFactory->getCanonicalName() == kWiredTigerEngineName) {
                    found = true;
                    factory = currentFactory;
                    break;
                }
                found = true;
            }
            ASSERT_TRUE(found);
            _oldOptions = wiredTigerGlobalOptions;
        }

        virtual void tearDown() {
            wiredTigerGlobalOptions = _oldOptions;
            factory = NULL;
        }

        WiredTigerGlobalOptions _oldOptions;

    protected:
        const StorageEngine::Factory* factory;
    };

    void _testValidateMetadata(const StorageEngine::Factory* factory,
                               const BSONObj& metadataOptions,
                               bool directoryPerDB,
                               bool directoryForIndexes,
                               ErrorCodes::Error expectedCode) {
        // It is fine to specify an invalid data directory for the metadata
        // as long as we do not invoke read() or write().
        StorageEngineMetadata metadata("no_such_directory");
        metadata.setStorageEngineOptions(metadataOptions);

        StorageGlobalParams storageOptions;
        storageOptions.directoryperdb = directoryPerDB;
        wiredTigerGlobalOptions.directoryForIndexes = directoryForIndexes;

        Status status = factory->validateMetadata(metadata, storageOptions);
        if (expectedCode != status.code()) {
            FAIL(str::stream()
                << "Unexpected StorageEngine::Factory::validateMetadata result. Expected: "
                << ErrorCodes::errorString(expectedCode) << " but got "
                << status.toString()
                << " instead. metadataOptions: " << metadataOptions
                << "; directoryPerDB: " << directoryPerDB
                << "; directoryForIndexes: " << directoryForIndexes);
        }
    }

    // Do not validate fields that are not present in metadata.
    TEST_F(WiredTigerFactoryTest, ValidateMetadataEmptyOptions) {
        _testValidateMetadata(factory, BSONObj(), false, false, ErrorCodes::OK);
        _testValidateMetadata(factory, BSONObj(), false, true, ErrorCodes::OK);
        _testValidateMetadata(factory, BSONObj(), true, false, ErrorCodes::OK);
        _testValidateMetadata(factory, BSONObj(), false, false, ErrorCodes::OK);
    }

    TEST_F(WiredTigerFactoryTest, ValidateMetadataDirectoryPerDB) {
        _testValidateMetadata(factory, fromjson("{directoryPerDB: 123}"), false, false,
                              ErrorCodes::FailedToParse);
        _testValidateMetadata(factory, fromjson("{directoryPerDB: false}"), false, false,
                              ErrorCodes::OK);
        _testValidateMetadata(factory, fromjson("{directoryPerDB: false}"), true, false,
                              ErrorCodes::InvalidOptions);
        _testValidateMetadata(factory, fromjson("{directoryPerDB: true}"), false, false,
                              ErrorCodes::InvalidOptions);
        _testValidateMetadata(factory, fromjson("{directoryPerDB: true}"), true, false,
                              ErrorCodes::OK);
    }

    TEST_F(WiredTigerFactoryTest, ValidateMetadataDirectoryForIndexes) {
        _testValidateMetadata(factory, fromjson("{directoryForIndexes: 123}"), false, false,
                              ErrorCodes::FailedToParse);
        _testValidateMetadata(factory, fromjson("{directoryForIndexes: false}"), false, false,
                              ErrorCodes::OK);
        _testValidateMetadata(factory, fromjson("{directoryForIndexes: false}"), false, true,
                              ErrorCodes::InvalidOptions);
        _testValidateMetadata(factory, fromjson("{directoryForIndexes: true}"), false, false,
                              ErrorCodes::InvalidOptions);
        _testValidateMetadata(factory, fromjson("{directoryForIndexes: true}"), true, true,
                              ErrorCodes::OK);
    }

    void _testCreateMetadataOptions(const StorageEngine::Factory* factory,
                                    bool directoryPerDB,
                                    bool directoryForIndexes) {
        StorageGlobalParams storageOptions;
        storageOptions.directoryperdb = directoryPerDB;
        wiredTigerGlobalOptions.directoryForIndexes = directoryForIndexes;

        BSONObj metadataOptions = factory->createMetadataOptions(storageOptions);

        BSONElement directoryPerDBElement = metadataOptions.getField("directoryPerDB");
        ASSERT_TRUE(directoryPerDBElement.isBoolean());
        ASSERT_EQUALS(directoryPerDB, directoryPerDBElement.boolean());

        BSONElement directoryForIndexesElement = metadataOptions.getField("directoryForIndexes");
        ASSERT_TRUE(directoryForIndexesElement.isBoolean());
        ASSERT_EQUALS(directoryForIndexes, directoryForIndexesElement.boolean());
    }

    TEST_F(WiredTigerFactoryTest, CreateMetadataOptions) {
        _testCreateMetadataOptions(factory, false, false);
        _testCreateMetadataOptions(factory, false, true);
        _testCreateMetadataOptions(factory, true, false);
        _testCreateMetadataOptions(factory, true, true);
    }

}  // namespace