///
/// Copyright (c) 2012, Texas A&M University
/// All rights reserved.
///
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/// modification, are permitted provided that the following conditions
/// are met:
///
///  * Redistributions of source code must retain the above copyright
///    notice, this list of conditions and the following disclaimer.
///  * Redistributions in binary form must reproduce the above
///    copyright notice, this list of conditions and the following
///    disclaimer in the documentation and/or other materials provided
///    with the distribution.
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///    contributors may be used to endorse or promote products derived
///    from this software without specific prior written permission.
///
/// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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/// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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/// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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/// The following software was written as part of a collaboration with the
/// University of South Carolina, Interdisciplinary Mathematics Institute.
///

/// @file statistics.h
/// @details The statistics of the current editing. These statistics will be
/// displayed in a pop-up dialog.
/// @author Yue Li and Matthew Hielsberg

#pragma once

#include <vector>
#include <string>
#include <cassert>
#include <pcl/apps/point_cloud_editor/localTypes.h>

class Statistics
{
  public:
    /// @brief Destructor
    virtual ~Statistics ()
    = default;

    /// @brief Returns the strings of the statistics.
    static
    std::string
    getStats();
    
    static
    void
    clear();
    
  protected:
    /// @brief The default constructor.
    Statistics ()
    = default;

    /// @brief Copy Constructor
    Statistics (const Statistics&)
    {
      assert(false); 
    }

    /// @brief Equal Operator
    virtual
    Statistics&
    operator= (const Statistics&)
    {
      assert(false); return (*this);
    }

    /// @brief Returns the statistics in string.
    virtual
    std::string
    getStat () const = 0;

    /// @brief Register a statistics
    void
    registerStats ();
    
  private:
    static std::vector<Statistics*> stat_vec_;
};
