/*
 * Copyright (C) 2020 Open Source Robotics Foundation
 *
 * 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.
 *
*/

syntax = "proto3";
package gz.msgs;
option java_package = "com.gz.msgs";
option java_outer_classname = "StatisticProtos";

/// \ingroup gz.msgs
/// \interface Statistic
/// \brief A message that contains statistics data.

import "gz/msgs/header.proto";

message Statistic
{
  /// \brief The type of data represented by this statistic.
  enum DataType
  {
    /// \brief The data type has not been initialized.
    UNINITIALIZED    = 0;
    /// \brief An average value is represented.
    AVERAGE          = 1;
    /// \brief A minimum value is represented.
    MINIMUM          = 2;
    /// \brief A maximum value is represented.
    MAXIMUM          = 3;
    /// \brief A variance is represented.
    VARIANCE         = 4;
    /// \brief A standard deviation is represented.
    STDDEV           = 5;
    /// \brief A sample count is represented.
    SAMPLE_COUNT     = 6;
    /// \brief A root mean square value is represented.
    ROOT_MEAN_SQUARE = 7;
    /// \brief A maximum absolute value is represented.
    MAX_ABS_VALUE    = 8;
  }

  /// \brief Optional header data
  Header header  = 1;

  /// \brief The data type.
  DataType type  = 2;

  /// \brief Name associated with the statistic.
  string   name  = 3;

  /// \brief The statistic's value.
  double   value = 4;
}

/// \brief A named group of statistics.
message StatisticsGroup
{
  /// \brief Optional header data.
  Header header                 = 1;

  /// \brief Name of the group.
  string name                   = 2;

  /// \brief Statistics the belong to this group.
  repeated Statistic statistics = 3;
}

message Metric
{
  /// \brief Optional header data
  Header header  = 1;

  /// \brief Unit of measurement such as seconds, meters, liters.
  string   unit  = 2;

  /// \brief Zero or more named groups of statistics. A statistic group is
  /// used to bundle data into a logical set with an associated name.
  repeated StatisticsGroup statistics_groups = 3;

  /// \brief Zero or more statistics.
  repeated Statistic statistics          = 4;
}