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/*
 * Copyright 2008 Search Solution Corporation
 * Copyright 2016 CUBRID Corporation
 *
 *  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.
 *
 */

/*
 * perf.cpp - implementation of performance statistics basic utilities
 */

#include "perf.hpp"

#include "error_manager.h"

#include <stdexcept>

#include <cstring>
// XXX: SHOULD BE THE LAST INCLUDE HEADER
#include "memory_wrapper.hpp"

namespace cubperf
{
  // stat_definition
  stat_definition::stat_definition (void)
  {
    // nothing
  }

  stat_definition::stat_definition (const stat_definition &other)
    : m_id (other.m_id)
    , m_type (other.m_type)
    , m_names { other.m_names[0], other.m_names[1] }
    , m_offset (0)
  {
    //
  }

  stat_definition &
  stat_definition::operator= (const stat_definition &other)
  {
    m_id = other.m_id;
    m_type = other.m_type;
    for (std::size_t i = 0; i < MAX_VALUE_COUNT; ++i)
      {
    m_names[i] = other.m_names[i];
      }
    m_offset = 0;

    return *this;
  }

  std::size_t
  stat_definition::get_value_count (void) const
  {
    return m_type == type::COUNTER_AND_TIMER ? 2 : 1;
  }

  // statset_definition

  statset_definition::statset_definition (statset_definition::init_list_t defs)
    : m_stat_count (defs.size ())
    , m_value_count (0)
    , m_stat_defs (nullptr)
    , m_value_names (nullptr)
  {
    // copy definitions
    m_stat_defs = new stat_definition[defs.size ()];
    std::size_t stat_index = 0;
    for (auto &def_it : defs)
      {
    if (def_it.m_id != stat_index)
      {
        // statset_definition is bad; crash program
        throw std::runtime_error ("statset_definition is bad");
      }
    m_stat_defs[stat_index] = def_it;  // copy definitions

    // set offset and increment value count
    m_stat_defs[stat_index].m_offset = m_value_count;
    m_value_count += def_it.get_value_count ();

    // increment index
    stat_index++;
      }

    // names for all values
    m_value_names = new std::string[m_value_count];
    std::size_t value_index = 0;
    for (stat_index = 0; stat_index < m_stat_count; stat_index++)
      {
    assert (value_index == m_stat_defs[stat_index].m_offset);
    for (std::size_t def_name_index = 0; def_name_index < m_stat_defs[stat_index].get_value_count ();
         def_name_index++)
      {
        m_value_names[value_index++] = m_stat_defs[stat_index].m_names[def_name_index];
      }
      }
  }

  statset_definition::~statset_definition (void)
  {
    delete [] m_stat_defs;
    delete [] m_value_names;
  }

  statset *
  statset_definition::create_statset (void) const
  {
    return new statset (get_value_count ());
  }

  atomic_statset *
  statset_definition::create_atomic_statset (void) const
  {
    return new atomic_statset (get_value_count ());
  }

  std::size_t
  cubperf::statset_definition::get_stat_count () const
  {
    return m_stat_count;
  }

  std::size_t
  cubperf::statset_definition::get_value_count () const
  {
    return m_value_count;
  }

  const char *
  statset_definition::get_value_name (std::size_t value_index) const
  {
    return m_value_names[value_index].c_str ();
  }

  std::size_t
  statset_definition::get_values_memsize (void) const
  {
    return get_value_count () * sizeof (stat_value);
  }

  void
  cubperf::statset_definition::get_stat_values (const statset &statsetr, stat_value *output_stats) const
  {
    std::memcpy (output_stats, statsetr.m_values, get_values_memsize ());
  }

  void
  cubperf::statset_definition::get_stat_values (const atomic_statset &statsetr, stat_value *output_stats) const
  {
    for (std::size_t it = 0; it < get_value_count (); it++)
      {
    output_stats[it] = statsetr.m_values[it];
      }
  }

  void
  cubperf::statset_definition::add_stat_values (const statset &statsetr, stat_value *output_stats) const
  {
    for (std::size_t it = 0; it < get_value_count (); it++)
      {
    output_stats[it] += statsetr.m_values[it];
      }
  }

  void
  cubperf::statset_definition::add_stat_values (const atomic_statset &statsetr, stat_value *output_stats) const
  {
    for (std::size_t it = 0; it < get_value_count (); it++)
      {
    output_stats[it] += statsetr.m_values[it];
      }
  }

} // namespace cubperf