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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.rocketmq.mqtt.common.util;

import org.apache.commons.lang3.StringUtils;

public class NamespaceUtil {
    public static final String NAMESPACE_SPLITER = "%";
    private static final int RESOURCE_LENGTH = 2;
    public static final String MQ_DEFAULT_NAMESPACE_NAME = "DEFAULT_INSTANCE";

    public static String encodeToNamespaceResource(String namespace, String resource) {
        return resource != null && namespace != null ? StringUtils.join(namespace, NAMESPACE_SPLITER, resource) : resource;
    }

    public static String decodeOriginResource(String resource) {
        if (resource != null && resource.contains(NAMESPACE_SPLITER)) {
            int firstIndex = resource.indexOf(NAMESPACE_SPLITER);
            return resource.substring(firstIndex + 1);
        }
        return resource;
    }

    public static String decodeMqttNamespaceIdFromKey(String key) {
        return decodeMqttNamespaceIdFromClientId(key);
    }

    public static String decodeMqttNamespaceIdFromClientId(String clientId) {
        return splitNamespaceStr(clientId);
    }

    public static String decodeStoreNamespaceIdFromTopic(String topic) {
        return splitNamespaceStr(topic);
    }

    public static String decodeNamespaceId(String resource) {
        return splitNamespaceStr(resource);
    }

    private static String splitNamespaceStr(String namespaceStr) {
        return namespaceStr != null && namespaceStr.contains(NAMESPACE_SPLITER) ? namespaceStr.split(NAMESPACE_SPLITER)[0] : null;
    }
}