// Copyright 2016-2019 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 GuidPrefix_t.hpp

 */

#ifndef FASTDDS_RTPS_COMMON__GUIDPREFIX_T_HPP

#define FASTDDS_RTPS_COMMON__GUIDPREFIX_T_HPP

#include <fastdds/fastdds_dll.hpp>

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

#include <cstdint>

#include <cstring>

#include <sstream>

#include <iomanip>

namespace eprosima {

namespace fastdds {

namespace rtps {

//!@brief Structure GuidPrefix_t, Guid Prefix of GUID_t.

//!@ingroup COMMON_MODULE

struct FASTDDS_EXPORTED_API GuidPrefix_t

{

    static constexpr unsigned int size = 12;

    octet value[size];

    //!Default constructor. Set the Guid prefix to 0.

    GuidPrefix_t()

    {

        memset(value, 0, size);

    }

    /**

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

     *

     * @note This method assumes the value of \c other_guid_prefix was originally assigned by Fast-DDS vendor.

     *

     * @param other_guid_prefix GuidPrefix_t to compare to.

     *

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

     */

    bool is_on_same_host_as(

            const GuidPrefix_t& other_guid_prefix) const;

    /**

     * Checks whether this guid prefix is from a (Fast-DDS) entity created on this host (from where this method is called).

     *

     * @return true when this guid prefix is from a (Fast-DDS) entity created on this host, false otherwise.

     */

    bool is_from_this_host() const;

    /**

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

     *

     * @note This method assumes the value of \c other_guid_prefix was originally assigned by Fast-DDS vendor.

     *

     * @param other_guid_prefix GuidPrefix_t to compare to.

     *

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

     */

    bool is_on_same_process_as(

            const GuidPrefix_t& other_guid_prefix) const;

    /**

     * Checks whether this guid prefix is from a (Fast-DDS) entity created on this host and process (from where this method is called).

     *

     * @return true when this guid prefix is from a (Fast-DDS) entity created on this host and process, false otherwise.

     */

    bool is_from_this_process() const;

    static GuidPrefix_t unknown()

    {

        return GuidPrefix_t();

    }

#ifndef DOXYGEN_SHOULD_SKIP_THIS_PUBLIC

    /**

     * Guid prefix comparison operator

     * @param prefix guid prefix to compare

     * @return True if the guid prefixes are equal

     */

    bool operator ==(

            const GuidPrefix_t& prefix) const

    {

        return (memcmp(value, prefix.value, size) == 0);

    }

    /**

     * Guid prefix comparison operator

     * @param prefix Second guid prefix to compare

     * @return True if the guid prefixes are not equal

     */

    bool operator !=(

            const GuidPrefix_t& prefix) const

    {

        return (memcmp(value, prefix.value, size) != 0);

    }

    /**

     * Guid prefix minor operator

     * @param prefix Second guid prefix to compare

     * @return True if prefix is higher than this

     */

    bool operator <(

            const GuidPrefix_t& prefix) const

    {

        return std::memcmp(value, prefix.value, size) < 0;

    }

    /**

     * Guid Prefix compare static method.

     *

     * @param prefix1 First guid prefix to compare

     * @param prefix2 Second guid prefix to compare

     *

     * @return 0 if \c prefix1 is equal to \c prefix2 .

     * @return < 0 if \c prefix1 is lower than \c prefix2 .

     * @return > 0 if \c prefix1 is higher than \c prefix2 .

     */

    static int cmp(

            const GuidPrefix_t& prefix1,

            const GuidPrefix_t& prefix2)

    {

        return std::memcmp(prefix1.value, prefix2.value, size);

    }

#endif // ifndef DOXYGEN_SHOULD_SKIP_THIS_PUBLIC

};

const GuidPrefix_t c_GuidPrefix_Unknown;

inline std::ostream& operator <<(

        std::ostream& output,

        const GuidPrefix_t& guiP)

{

    std::stringstream ss;

    ss << std::hex;

    char old_fill = ss.fill('0');

    for (uint8_t i = 0; i < 11; ++i)

    {

        ss << std::setw(2) << (int)guiP.value[i] << ".";

    }

    ss << std::setw(2) << (int)guiP.value[11];

    ss.fill(old_fill);

    ss << std::dec;

    return output << ss.str();

}

inline std::istream& operator >>(

        std::istream& input,

        GuidPrefix_t& guiP)

{

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

    if (s)

    {

        char point;

        unsigned short hex;

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

        try

        {

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

            input >> std::hex >> hex;

            if (hex > 255)

            {

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

            }

            guiP.value[0] = static_cast<octet>(hex);

            for (int i = 1; i < 12; ++i)

            {

                input >> point >> hex;

                if ( point != '.' || hex > 255 )

                {

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

                }

                guiP.value[i] = static_cast<octet>(hex);

            }

            input >> std::dec;

        }

        catch (std::ios_base::failure& )

        {

            guiP = GuidPrefix_t::unknown();

        }

        input.exceptions(excp_mask);

    }

    return input;

}

} // namespace rtps

} // namespace fastdds

} // namespace eprosima

#endif // FASTDDS_RTPS_COMMON__GUIDPREFIX_T_HPP