#include <fstream>
#include <iostream>
#include <vector>
#include <iomanip>
#include <string>
#include <cmath>
#include <algorithm>

class Data
{
public:
  Data(std::string const& caption)
    : caption{caption}
  {}
  
  virtual ~Data() = default;

  virtual int get_point(int N) const = 0;

  virtual int size() const = 0;

  std::string get_caption() const
  {
    return caption;
  }

protected:
  std::string caption;
};

class File_Table : public Data
{
public:
    
  File_Table(std::string const& caption, std::string const& filename)
    : Data {caption}, coordinates {}
  {
    std::ifstream ifs {filename};
    int x {};
    int y {};
    while(ifs >> x >> y)
    {
      coordinates.push_back({x,y});
    }
  }

  int get_point(int N) const override
  {
    for (auto [x,y] : coordinates)
    {
      if (x == N)
      {
        return y;
      }
    }
    return 0;
  }

  int size() const override
  {
    return std::max_element(begin(coordinates), end(coordinates))->first;
  }
  
private:

  std::vector<std::pair<int, int>> coordinates;
};

class Sinus_Function : public Data
{
public:
    
  Sinus_Function(std::string const& caption, int x_start, int x_end)
    : Data{caption}, start{x_start}, end{x_end}
  {}
    
  int get_point(int N) const override
  {
    return sin_function(start + N);
  }

  int size() const override
  {
    return end - start + 1;
  }
  
private:

  int sin_function(int x) const
  {
    return static_cast<int>(sin(x) * 3 + 10);
  }

  int start;
  int end;
};

void plot(Data const& data, char mark = '+', char fill = ' ')
{
  std::cout << "=== Plotting " << data.get_caption() << " ===" << std::endl;
  
  for (int i {0}; i <= data.size(); ++i)
  {
    int value { data.get_point(i) };
    std::cout << std::setfill(fill) << std::setw(value) << mark << std::endl;
  }
}

class Plot
{
public:
  Plot(char m, char f) : mark{m}, fill{f} {}

  void operator<<(Data const& d) { plot(d, mark, fill); }
  
private:
  char mark;
  char fill;
};

int main()
{
  File_Table pd {"Measurements", "data.txt"};
  plot(pd, '|', '#');

  Sinus_Function sd {"Sinus", -5, 13};
  plot(sd);

  /*
  Plot barplot{'|', '#'};
  barplot << pd;
  barplot << sd;
  
  Plot mathplot{'+', ' '};
  mathplot << pd;
  mathplot << sd;
  */
}