////////////////////////////////////////////////////////////////////////////////
/// @brief utilities for figures
///
/// @file
///
/// DISCLAIMER
///
/// Copyright 2014 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// 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.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
/// @author Copyright 2010-2013, triAGENS GmbH, Cologne, Germany
////////////////////////////////////////////////////////////////////////////////

#ifndef ARANGODB_STATISTICS_FIGURES_H
#define ARANGODB_STATISTICS_FIGURES_H 1

#include "Basics/Common.h"

// -----------------------------------------------------------------------------
// --SECTION--                                                      public types
// -----------------------------------------------------------------------------

namespace triagens {
  namespace basics {

////////////////////////////////////////////////////////////////////////////////
/// @brief vector generator
////////////////////////////////////////////////////////////////////////////////

    struct StatisticsVector {
      StatisticsVector ()
        : _value() {
      }

      StatisticsVector& operator<< (double v) {
        _value.push_back(v);
        return *this;
      }

      std::vector<double> _value;
    };

////////////////////////////////////////////////////////////////////////////////
/// @brief a simple counter
////////////////////////////////////////////////////////////////////////////////

    struct StatisticsCounter {
      StatisticsCounter()
        : _count(0) {
      }

      void incCounter () {
        ++_count;
      }

      void decCounter () {
        --_count;
      }

      int64_t _count;
    };

////////////////////////////////////////////////////////////////////////////////
/// @brief a distribution with count, min, max, mean, and variance
////////////////////////////////////////////////////////////////////////////////

    struct StatisticsDistribution {
      StatisticsDistribution ()
        : _count(0), _total(0.0), _cuts(), _counts() {
      }

      StatisticsDistribution (StatisticsVector const& dist)
        : _count(0), _total(0.0), _cuts(dist._value), _counts() {
        _counts.resize(_cuts.size() + 1);
      }

      void addFigure (double value) {
        ++_count;
        _total += value;

        std::vector<double>::iterator i = _cuts.begin();
        std::vector<uint64_t>::iterator j = _counts.begin();

        for (;  i != _cuts.end();  ++i, ++j) {
          if (value < *i) {
            ++(*j);
            return;
          }
        }

        ++(*j);
      }

      uint64_t _count;
      double _total;
      std::vector<double> _cuts;
      std::vector<uint64_t> _counts;
    };
  }
}

#endif

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