///////////////////////////////////////////////////////////////////////
// MT2Q4.cpp - Asynchronous text finder                              //
//                                                                   //
// Jim Fawcett, CSE687 - Object Oriented Design, Midterm Spring 2018 //
///////////////////////////////////////////////////////////////////////

#include "MT2Q4.h"
#include "../StringUtilities/StringUtilities.h"
#include <iostream>

//----< synchronous text finder >--------------------------------------

bool MT2Q4::findText(const std::string& text, const std::string& filePath)
{
  std::ifstream in(filePath);
  if (!in.good())
  {
    std::cout << "\n  can't open \"" << filePath << "\"";
    return false;
  }
  std::string fileText;
  while (in.good())
  {
    char ch;
    in >> ch;
    if(ch != '\n')    // text may span multiple lines
      fileText += ch;
  }
  size_t pos = fileText.find(text);
  return pos < fileText.size();
}
//----< run finder asynchronously >------------------------------------

std::future<bool> MT2Q4::findTextAsync(FPtr finder, const std::string& text, const std::string& filePath)
{
  return std::async(finder, text, filePath);

  ///////////////////////////////////////////////////////////////
  // if you want to implement the whole thing, here's how:
  //
  // std::promise<bool> prm;
  // std::future<bool> fut(prm.get_future());
  // auto lambda = [finder](const std::string& text, const std::string& filePath, std::promise<bool> p) {
  //   bool ret = pFinder(text, filePath);
  //   p.set_value(ret);
  // };
  // std::thread t(lambda, text, filePath, std::move(prm));
  // t.detach();
  // return fut;
}

int main()
{
  Utilities::Title("MT2Q4 - text finder");
  MT2Q4 mt2q4;
  std::string text = "main";
  std::string fPath1 = "../Test/Copy_MT2Q4.h";
  std::string fPath2 = "../Test/Copy_MT2Q4.cpp";
  std::future<bool> f1 = mt2q4.findTextAsync(MT2Q4::findText, text, fPath1);
  std::future<bool> f2 = mt2q4.findTextAsync(MT2Q4::findText, text, fPath2);

  if (f1.get())
    std::cout << "\n  found \"" << text << "\" in file \"" << fPath1;
  else
    std::cout << "\n  didn't find \"" << text << "\" in file \"" << fPath1;

  if (f2.get())
    std::cout << "\n  found \"" << text << "\" in file \"" << fPath2;
  else
    std::cout << "\n  didn't find \"" << text << "\" in file \"" << fPath2;

  std::cout << "\n\n";
  return 0;
}