// abc.cpp
//----------------------------------------------------------------------------
// Calculate the time it takes to type the ABC's.
//----------------------------------------------------------------------------

//          Copyright Michael Thomas Greer 2010
// Distributed under the Boost Software License, Version 1.0.
//    ( See accompanying file LICENSE_1_0.txt or copy at
//          http://www.boost.org/LICENSE_1_0.txt )

//----------------------------------------------------------------------------
// See http://www.cplusplus.com/forum/beginner/28855/

#include <ciso646>
#include <iomanip>
#include <iostream>
#include <string>
using namespace std;

//----------------------------------------------------------------------------
typedef double epoch_time_t;

//----------------------------------------------------------------------------
#ifdef __WIN32__

  #include <windows.h>

  epoch_time_t get_epoch_time()  // Since 1601 Jan 1
    {
    FILETIME f;
    GetSystemTimeAsFileTime( &f );
    LARGE_INTEGER t =
      { {
      f.dwLowDateTime,
      f.dwHighDateTime
      } };
    return t.QuadPart / 10000000.0;  // 100 nano-second intervals
    }

  void waitforkeypress()
    {
    WaitForSingleObject(
      GetStdHandle( STD_INPUT_HANDLE ),
      INFINITE
      );
    }

//----------------------------------------------------------------------------
#else // POSIX

  #include <sys/time.h>

  epoch_time_t get_epoch_time()  // Since 1970 Jan 1
    {
    struct timeval tv;
    if (gettimeofday( &tv, NULL )) return 0.0;
    return tv.tv_sec + tv.tv_usec / 1000000.0;
    }

  #include <unistd.h>
  #include <termios.h>
  #include <poll.h>

  #define INFINITE (-1)

  void waitforkeypress()
    {
    struct termios initial_settings;
    tcgetattr( STDIN_FILENO, &initial_settings );

    struct termios settings = initial_settings;
    settings.c_lflag &= ~(ICANON);
    tcsetattr( STDIN_FILENO, TCSANOW, &settings );

    struct pollfd pls[ 1 ];
    pls[ 0 ].fd     = STDIN_FILENO;
    pls[ 0 ].events = POLLIN | POLLPRI;
    poll( pls, 1, INFINITE );

    tcsetattr( STDIN_FILENO, TCSANOW, &initial_settings );
    }

#endif

//----------------------------------------------------------------------------
const char* ABCS = "abcdefghijklmnopqrstuvwxyz";

//----------------------------------------------------------------------------
int main()
  {
  epoch_time_t start, stop;

  while (true)
    {
    string abcs;

    ios::sync_with_stdio( true );
    cout <<
      "Please enter the alphabet (in miniscules) as quickly as you can.\n"
      "You will be timed to see how long it takes.\n"
      "Begin when you are ready.\n\n"
      "> "
      << flush;

    waitforkeypress();
    start = get_epoch_time();
    getline( cin, abcs );
    stop = get_epoch_time();

    double time_spent = stop - start;

    unsigned minutes    = (unsigned) time_spent        / 60;
    unsigned seconds    = (unsigned) time_spent        % 60;
    unsigned hundredths = (unsigned)(time_spent * 100) % 100;

    cout << "It took you "
         << setfill( '0' ) << minutes    << ":"
         << setw( 2 )      << seconds    << "."
         << setw( 2 )      << hundredths;

    if (abcs == ABCS)
      {
      cout << ". Good job!\n";
      break;
      }

    cout << ", but you mistyped the alphabet.\n"
            "Would you like to try again ([y]/n)? "
         << flush;
    getline( cin, abcs );
    if (!abcs.empty() and (abcs[ 0 ] == 'n')) break;

    cout << "\n\n";
    }

  return 0;
  }

// end abc.cpp