#include "muduo/base/noncopyable.h"
#include "muduo/base/Types.h"
#include <vector>
#include <stdlib.h> // ssize_t

typedef struct gdImageStruct* gdImagePtr;

class Plot : muduo::noncopyable
{
 public:
  Plot(int width, int height, int totalSeconds, int samplingPeriod);
  ~Plot();
  muduo::string plotCpu(const std::vector<double>& data);

 private:
  muduo::string toPng();
  // pair<shared_ptr<void*>, int> toPng();
  int getX(ssize_t x, ssize_t total) const;
  int getY(double value) const;
  void label(double maxValue);

  // gdFont is a typedef of unnamed struct, cannot be forward declared
  // wordaround suggested in http://stackoverflow.com/questions/7256436/forward-declarations-of-unnamed-struct
  struct MyGdFont;
  typedef struct MyGdFont* MyGdFontPtr;

  const int width_;
  const int height_;
  const int totalSeconds_;
  const int samplingPeriod_;
  gdImagePtr const image_;
  MyGdFontPtr const font_;
  const int fontWidth_;
  const int fontHeight_;
  const int background_;
  const int black_;
  const int gray_;
  const int blue_;

  const int kRightMargin_;
  static const int kLeftMargin_ = 5;
  static const int kMarginY_ = 5;

  const double ratioX_;
};