///////////////////////////////////////////////////////////////
// MT2-Q2b - child thread searches text file                 //
//                                                           //
// Jim Fawcett, CSE687 - Object Oriented Design, Spring 2018 //
///////////////////////////////////////////////////////////////

#include <fstream>
#include <iostream>
#include <string>
#include <thread>
#include <future>

bool textSearch(const std::string& fileName, const std::string& text)
{
  std::ifstream in(fileName);
  if (!in.good())
  {
    std::cout << "\n  can't open file \"" << fileName.c_str() << "\"";
    return false;
  }
  std::string line;
  while (std::getline(in, line).good())
  {
    if (line.find(text) != std::string::npos)
    {
      in.close();
      return true;
    }
  }
  in.close();
  return false;
}

void showResult(bool result, const std::string& filename, const std::string& text)
{
  if (result)
    std::cout << "\n  file \"" << filename << "\" contains text \"" << text << "\"";
  else
    std::cout << "\n  file \"" << filename << "\" does not contain text \"" << text << "\"";
}

int main()
{
  std::cout << "\n  MT2-Q2b - asynch text search in file";
  std::cout << "\n --------------------------------------";

  std::string fileName1 = "MT2-Q2b.cpp";
  std::string text1 = "async";
  std::future<bool> fut1 = std::async(std::launch::async, textSearch, fileName1, text1);
  std::string fileName2 = "../MT2-Q2/MT2-Q2.cpp";
  std::string text2 = "feebar";
  std::future<bool> fut2 = std::async(std::launch::async, textSearch, fileName2, text2);
  showResult(fut1.get(), fileName1, text1);
  showResult(fut2.get(), fileName2, text2);

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