// tbench1.cpp. Simple benchmark of Organism class.
//
// g++ compile on Linux:
//   g++ -o tbench1 -std=c++11 -Wall -O3 tbench1.cpp
// Note: the g++ command above also works with mingw C++ compiler (https://sourceforge.net/projects/mingw-w64)
// that comes bundled with Strawberry Perl (C:\Strawberry\c\bin\g++.exe)
//
// MSVC 2017 compile on Windows, start a 64-bit compiler cmdline via:
//   Start > AllApps > Visual Studio 2017 > x64 Native Tools Command Prompt for VS2017
// then:
//   cl /W3 /MT /Ox /EHsc tbench1.cpp

#include <cstdlib>
#include <ctime>
#include <string>
#include <iostream>
#include <fstream>
#include <sstream>

#include "grid.h"

static bool is_file_exist(const char *fname) {
   std::ifstream infile(fname);
   return infile.good();
}

static Cell read_cell(const std::string& str) {
   cell_coord_type x, y;
   std::istringstream iss(str);
   iss >> x; iss >> y;
   return Cell(x, y);
}

// Reads a Life 1.06 text file
static cell_list_type read_cells_106(const char* fname) {
   cell_list_type cells;
   std::ifstream cellfile(fname);
   if (!cellfile) {
      std::cerr << "Error opening '" << fname << "'\n";
      return cells;
   }
   for (std::string line; std::getline(cellfile, line); ) {
      if (line.empty())   continue;    // ignore blank lines
      if (line[0] == '#') continue;    // ignore comment lines
      cells.push_back(read_cell(line));
   }
   return cells;
}

static void RunTest(const char* fname, int nticks, int niter)
{
   cell_list_type initial_cells = read_cells_106(fname);
   size_t n_init = initial_cells.size();
   size_t ncells;
   std::cout << "run " << niter << " iterations of " << nticks << " ticks\n";
   time_t tstart = ::time(NULL);
   for (int i = 1; i <= niter; ++i) {
      Organism org;
      org.insert_cells(initial_cells);
      ncells = org.count();
      // if (ncells != n_init) { std::cout << "oops\n"; }
      std::cout << i << " cell count at start = " << n_init << "---\n";
      for (int j = 1; j <= nticks; ++j) {
         org.tick();
      }
      ncells = org.count();
      std::cout << i << " cell count at end = " << ncells << "\n";
   }
   time_t tend = ::time(NULL);
   long time_total  = static_cast<long>(::difftime(tend, tstart) + 0.5);
   double time_ave = (double)time_total / (double)niter;
   std::cout << "total time taken " << time_total << " secs\n";
   std::cout << "time per run " << time_ave << " secs\n";
}

int main(int argc, char* argv[])
{
   if (argc != 4) {
      std::cerr << "usage: tbench1 file nticks niter\n";
      return 1;
   }
   const char* fname = argv[1];
   if (!is_file_exist(fname)) {
      std::cerr << "File '" << fname << "' does not exist\n";
      return 1;
   }
   int nticks = ::atoi(argv[2]);
   if (nticks <= 0)
   {
      std::cerr << "'" << argv[2] << "'" << " invalid nticks\n";
      return 1;
   }
   int niter = ::atoi(argv[3]);
   if (niter <= 0)
   {
      std::cerr << "'" << argv[3] << "'" << " invalid niter\n";
      return 1;
   }
   RunTest(fname, nticks, niter);
   return 0;
}