/************************************************************************
* file name         : block.cpp
* ----------------- :
* creation time     : 2016/02/16
* authors           : Sergey Yagovtsev, Victor Zarubkin
* emails            : yse.sey@gmail.com, v.s.zarubkin@gmail.com
* ----------------- :
* description       : The file contains implementation of profiling blocks
*                   :
* license           : Lightweight profiler library for c++
*                   : Copyright(C) 2016  Sergey Yagovtsev, Victor Zarubkin
*                   :
*                   : This program is free software : you can redistribute it and / or modify
*                   : it under the terms of the GNU General Public License as published by
*                   : the Free Software Foundation, either version 3 of the License, or
*                   : (at your option) any later version.
*                   :
*                   : This program is distributed in the hope that it will be useful,
*                   : but WITHOUT ANY WARRANTY; without even the implied warranty of
*                   : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
*                   : GNU General Public License for more details.
*                   :
*                   : You should have received a copy of the GNU General Public License
*                   : along with this program.If not, see <http://www.gnu.org/licenses/>.
************************************************************************/
#include "profiler/profiler.h"
#include "profile_manager.h"
#include <ctime>
#include <chrono>
#include <thread>

using namespace profiler;

#ifdef _WIN32
decltype(LARGE_INTEGER::QuadPart) CPU_FREQUENCY = ([](){ LARGE_INTEGER freq; QueryPerformanceFrequency(&freq); return freq.QuadPart; })();
#endif

inline timestamp_t getCurrentTime()
{
#ifdef _WIN32
    //see https://msdn.microsoft.com/library/windows/desktop/dn553408(v=vs.85).aspx
    LARGE_INTEGER elapsedMicroseconds;
    if (!QueryPerformanceCounter(&elapsedMicroseconds))
        return 0;
    //elapsedMicroseconds.QuadPart *= 1000000000LL;
    //elapsedMicroseconds.QuadPart /= CPU_FREQUENCY;
    return (timestamp_t)elapsedMicroseconds.QuadPart;
#else
    std::chrono::time_point<std::chrono::system_clock, std::chrono::nanoseconds> time_point;
    time_point = std::chrono::time_point_cast<std::chrono::nanoseconds>(std::chrono::system_clock::now());
    return time_point.time_since_epoch().count();
#endif
}

BaseBlockData::BaseBlockData(timestamp_t _begin_time, block_id_t _descriptor_id)
    : m_begin(_begin_time)
    , m_end(0)
    , m_id(_descriptor_id)
{

}

Block::Block(Block&& that)
    : BaseBlockData(that.m_begin, that.m_id)
    , m_name(that.m_name)
    , m_enabled(that.m_enabled)
{
    m_end = that.m_end;
}

Block::Block(const BaseBlockDescriptor& _descriptor, const char* _runtimeName)
    : BaseBlockData(_descriptor.enabled() ? getCurrentTime() : 1ULL, _descriptor.id())
    , m_name(_runtimeName)
    , m_enabled(_descriptor.enabled())
{
}

Block::Block(timestamp_t _begin_time, block_id_t _descriptor_id, const char* _runtimeName)
    : BaseBlockData(_begin_time, _descriptor_id)
    , m_name(_runtimeName)
    , m_enabled(true)
{
}

void Block::start()
{
    m_begin = getCurrentTime();
}

void Block::start(timestamp_t _time)
{
    m_begin = _time;
}

void Block::finish()
{
    m_end = getCurrentTime();
}

void Block::finish(timestamp_t _time)
{
    m_end = _time;
}

Block::~Block()
{
    if (!finished())
        ::profiler::endBlock();
}