/**
* Copyright (C) 2013 kangliqiang ,kangliq@163.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.
*/

#ifndef __REMOTINGCOMMAND_H__
#define __REMOTINGCOMMAND_H__

#include <sstream>
#include <string>

#include "RocketMQClient.h"
#include "AtomicValue.h"
#include "RefHandle.h"

namespace rmq
{
    const std::string CODE_STRING = "\"code\":";
    const std::string language_STRING = "\"language\":";
    const std::string version_STRING = "\"version\":";
    const std::string opaque_STRING = "\"opaque\":";
    const std::string flag_STRING = "\"flag\":";
    const std::string remark_STRING = "\"remark\":";
    const std::string extFields_STRING = "\"extFields\":";

    const std::string RemotingVersionKey = "rocketmq.remoting.version";

    class CommandCustomHeader;

    typedef enum
    {
        REQUEST_COMMAND,
        RESPONSE_COMMAND
    } RemotingCommandType;

    typedef enum
    {
        SUCCESS_VALUE = 0,
        SYSTEM_ERROR_VALUE,
        SYSTEM_BUSY_VALUE,
        REQUEST_CODE_NOT_SUPPORTED_VALUE,
    } ResponseCode;

    typedef enum
    {
        JAVA,
        CPP,
        DOTNET,
        PYTHON,
        DELPHI,
        ERLANG,
        RUBY,
        OTHER,
    } LanguageCode;

    const int RPC_TYPE = 0; // 0, REQUEST_COMMAND // 1, RESPONSE_COMMAND
    const int RPC_ONEWAY = 1; // 0, RPC // 1, Oneway

    class RemotingCommand : public kpr::RefCount
    {
    public:
        RemotingCommand(int code);
        RemotingCommand(int code,
                        const std::string& language,
                        int version,
                        int opaque,
                        int flag,
                        const std::string& remark,
                        CommandCustomHeader* pCustomHeader);
        ~RemotingCommand();

        void encode();
        std::string toString() const;

        const char* getData();
        int getDataLen();

        const char* getBody();
        int getBodyLen();
        void setBody(char* pData, int len, bool copy);
        CommandCustomHeader* makeCustomHeader(int code, const char* pData, int len);

        int getCode();
        void setCode(int code);

        std::string getLanguage();
        void setLanguage(const std::string& language);

        int getVersion();
        void setVersion(int version);

        int getOpaque();
        void setOpaque(int opaque);

        int getFlag();
        void setFlag(int flag);

        std::string getRemark();
        void setRemark(const std::string& remark);

        void setCommandCustomHeader(CommandCustomHeader* pCommandCustomHeader);
        CommandCustomHeader* getCommandCustomHeader();

        RemotingCommandType getType();
        void markResponseType();
        bool isResponseType() ;
        void markOnewayRPC();
        bool isOnewayRPC();

        static void setCmdVersion(RemotingCommand* pCmd);
		static RemotingCommand* decode(const char* pData, int len);
        static RemotingCommand* createRequestCommand(int code, CommandCustomHeader* pCustomHeader);
		static RemotingCommand* createResponseCommand(int code, const std::string& remark);
		static RemotingCommand* createResponseCommand(int code, const std::string& remark, CommandCustomHeader* pCustomHeader);


    private:
        static volatile int s_configVersion;

    private:
        int m_code;
        std::string m_language;
        int m_version;
        int m_opaque;
        int m_flag;
        std::string m_remark;
        CommandCustomHeader* m_pCustomHeader;

        int m_dataLen;
        char* m_pData;

        int m_bodyLen;
        char* m_pBody;

        bool m_releaseBody;

        static kpr::AtomicInteger s_seqNumber;
    };
    typedef kpr::RefHandleT<RemotingCommand> RemotingCommandPtr;
}

#endif