///////////////////////////////////////////////////////////////////////
// MT1Q7.cpp - Meaning of Life                                       //
//                                                                   //
// Jim Fawcett, CSE687 - Object Oriented Design, Midterm Spring 2018 //
///////////////////////////////////////////////////////////////////////

#include <thread>
#include <future>
#include <chrono>
#include <string>
#include <iostream>
#include "../CppNoSqlDb/DateTime/DateTime.h"

struct Result
{
  size_t mol;
  std::string blahBlah;
};

Result meaningOfLife(DateTime dt)
{
  auto childThreadId = std::this_thread::get_id();
  std::cout << "\n  child thread id = " << childThreadId;
  std::this_thread::sleep_for(std::chrono::milliseconds(2000));
  Result result;
  result.mol = 42;
  result.blahBlah = "The meaning of life on " + std::string(dt) + " is ,as any fool can see, ";;
  return result;
}

int main()
{
  std::cout << "\n  MT1Q7 - Meaning of life";
  std::cout << "\n =========================\n";

  auto mainThreadId = std::this_thread::get_id();
  std::cout << "\n  main thread id = " << mainThreadId;
  std::future<Result> fut = std::async(std::launch::async, meaningOfLife, DateTime().now());
  Result result = fut.get();
  std::cout << "\n  " << result.blahBlah << result.mol << "!\n";
  std::cout << "\n  Thanks, Douglas Adams, for all the fish.\n\n";

  ////////////////////////////////////////////////////
  // The code below runs the function asynchronously, 
  // but does not make the result accessible.
  //
  // std::thread t(meaningOfLife, DateTime().now());
  // t.join();

  return 0;
}