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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * 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.
 */
package org.neo4j.driver.internal.bolt.api;

import java.util.Objects;
import java.util.Optional;

public final class DatabaseNameUtil {
    static final String DEFAULT_DATABASE_NAME = null;
    public static final String SYSTEM_DATABASE_NAME = "system";

    private static final DatabaseName DEFAULT_DATABASE = new DatabaseName() {
        @Override
        public Optional databaseName() {
            return Optional.empty();
        }

        @Override
        public String description() {
            return "";
        }
    };
    private static final DatabaseName SYSTEM_DATABASE = new InternalDatabaseName(SYSTEM_DATABASE_NAME);

    public static DatabaseName defaultDatabase() {
        return DEFAULT_DATABASE;
    }

    public static DatabaseName systemDatabase() {
        return SYSTEM_DATABASE;
    }

    public static DatabaseName database(String name) {
        if (Objects.equals(name, DEFAULT_DATABASE_NAME)) {
            return defaultDatabase();
        } else if (Objects.equals(name, SYSTEM_DATABASE_NAME)) {
            return systemDatabase();
        }
        return new InternalDatabaseName(name);
    }
}