// Copyright 2016 Proyectos y Sistemas de Mantenimiento SL (eProsima).

//

// 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.

/**

 * @file Guid.h

 */

#ifndef _FASTDDS_RTPS_RTPS_GUID_H_

#define _FASTDDS_RTPS_RTPS_GUID_H_

#include <fastrtps/fastrtps_dll.h>

#include <fastdds/rtps/common/Types.h>

#include <fastdds/rtps/common/GuidPrefix_t.hpp>

#include <fastdds/rtps/common/EntityId_t.hpp>

#include <cstdint>

#include <cstring>

#include <sstream>

namespace eprosima {

namespace fastrtps {

namespace rtps {

struct InstanceHandle_t;

//!@brief Structure GUID_t, entity identifier, unique in DDS-RTPS Domain.

//!@ingroup COMMON_MODULE

struct RTPS_DllAPI GUID_t

{

    //!Guid prefix

    GuidPrefix_t guidPrefix;

    //!Entity id

    EntityId_t entityId;

    /*!

     * Default constructor. Contructs an unknown GUID.

     */

    GUID_t() noexcept

    {

    }

    /**

     * Construct

     * @param guid_prefix Guid prefix

     * @param id Entity id

     */

    GUID_t(

            const GuidPrefix_t& guid_prefix,

            uint32_t id) noexcept

        : guidPrefix(guid_prefix)

        , entityId(id)

    {

    }

    /**

     * @param guid_prefix Guid prefix

     * @param entity_id Entity id

     */

    GUID_t(

            const GuidPrefix_t& guid_prefix,

            const EntityId_t& entity_id) noexcept

        : guidPrefix(guid_prefix)

        , entityId(entity_id)

    {

    }

    /**

     * Checks whether this guid is for an entity on the same host as another guid.

     *

     * @param other_guid GUID_t to compare to.

     *

     * @return true when this guid is on the same host, false otherwise.

     */

    bool is_on_same_host_as(

            const GUID_t& other_guid) const

    {

        return memcmp(guidPrefix.value, other_guid.guidPrefix.value, 4) == 0;

    }

    /**

     * Checks whether this guid is for an entity on the same host and process as another guid.

     *

     * @param other_guid GUID_t to compare to.

     *

     * @return true when this guid is on the same host and process, false otherwise.

     */

    bool is_on_same_process_as(

            const GUID_t& other_guid) const

    {

        return memcmp(guidPrefix.value, other_guid.guidPrefix.value, 8) == 0;

    }

    /**

     * Checks whether this guid corresponds to a builtin entity.

     *

     * @return true when this guid corresponds to a builtin entity, false otherwise.

     */

    bool is_builtin() const

    {

        return entityId.value[3] >= 0xC0;

    }

    static GUID_t unknown() noexcept

    {

        return GUID_t();

    }

    // TODO Review this conversion once InstanceHandle_t is implemented as DDS standard defines

    explicit operator const InstanceHandle_t&() const

    {

        return *reinterpret_cast<const InstanceHandle_t*>(this);

    }

};

#ifndef DOXYGEN_SHOULD_SKIP_THIS_PUBLIC

/**

 * GUID comparison operator

 * @param g1 First GUID to compare

 * @param g2 Second GUID to compare

 * @return True if equal

 */

inline bool operator ==(

        const GUID_t& g1,

        const GUID_t& g2)

{

    if (g1.guidPrefix == g2.guidPrefix && g1.entityId == g2.entityId)

    {

        return true;

    }

    else

    {

        return false;

    }

}

/**

 * GUID comparison operator

 * @param g1 First GUID to compare

 * @param g2 Second GUID to compare

 * @return True if not equal

 */

inline bool operator !=(

        const GUID_t& g1,

        const GUID_t& g2)

{

    if (g1.guidPrefix != g2.guidPrefix || g1.entityId != g2.entityId)

    {

        return true;

    }

    else

    {

        return false;

    }

}

inline bool operator <(

        const GUID_t& g1,

        const GUID_t& g2)

{

    for (uint8_t i = 0; i < 12; ++i)

    {

        if (g1.guidPrefix.value[i] < g2.guidPrefix.value[i])

        {

            return true;

        }

        else if (g1.guidPrefix.value[i] > g2.guidPrefix.value[i])

        {

            return false;

        }

    }

    for (uint8_t i = 0; i < 4; ++i)

    {

        if (g1.entityId.value[i] < g2.entityId.value[i])

        {

            return true;

        }

        else if (g1.entityId.value[i] > g2.entityId.value[i])

        {

            return false;

        }

    }

    return false;

}

#endif // ifndef DOXYGEN_SHOULD_SKIP_THIS_PUBLIC

const GUID_t c_Guid_Unknown;

#ifndef DOXYGEN_SHOULD_SKIP_THIS_PUBLIC

/**

 * Stream operator, prints a GUID.

 * @param output Output stream.

 * @param guid GUID_t to print.

 * @return Stream operator.

 */

inline std::ostream& operator <<(

        std::ostream& output,

        const GUID_t& guid)

{

    if (guid != c_Guid_Unknown)

    {

        output << guid.guidPrefix << "|" << guid.entityId;

    }

    else

    {

        output << "|GUID UNKNOWN|";

    }

    return output;

}

/**

 * Stream operator, retrieves a GUID.

 * @param input Input stream.

 * @param guid GUID_t to print.

 * @return Stream operator.

 */

inline std::istream& operator >>(

        std::istream& input,

        GUID_t& guid)

{

    std::istream::sentry s(input);

    if (s)

    {

        std::ios_base::iostate excp_mask = input.exceptions();

        try

        {

            input.exceptions(excp_mask | std::ios_base::failbit | std::ios_base::badbit);

            char sep;

            input >> guid.guidPrefix >> sep >> guid.entityId;

            if (sep != '|')

            {

                input.setstate(std::ios_base::failbit);

            }

        }

        catch (std::ios_base::failure&)

        {

            // maybe is unknown or just invalid

            guid = c_Guid_Unknown;

        }

        input.exceptions(excp_mask);

    }

    return input;

}

#endif // ifndef DOXYGEN_SHOULD_SKIP_THIS_PUBLIC

} // namespace rtps

} // namespace fastrtps

} // namespace eprosima

#endif /* _FASTDDS_RTPS_RTPS_GUID_H_ */