//   GreKo chess engine
//   (c) 2002-2018 Vladimir Medvedev <vrm@bk.ru>
//   http://greko.su

#ifndef _MSC_VER

#include <stdio.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <signal.h>
#include "utils.h"

static int g_pipe = 0;

U32 GetProcTime()
{
  // relative time in milliseconds
  return 1000 * clock() / CLOCKS_PER_SEC;
}

void SleepMillisec(int msec)
{
	usleep(1000 * msec);
}

void Highlight(bool on)
{
	//
	//   Turn highlight of the console text on or off
	//

	if (g_pipe) return;
	if (on)
		printf("\033[1m"); // ESC-[-1-m  --- ANSI ESC sequence for bold attribute
	else
		printf("\033[m");  // ESC-[-m  --- ANSI ESC sequence resetting all attributes
}

void InitIO()
{
	g_pipe = !isatty(0);
	if (g_pipe) signal(SIGINT, SIG_IGN);
	setbuf(stdout, NULL);
	setbuf(stdin, NULL);
}

bool InputAvailable()
{
	static fd_set input_fd_set;
	static fd_set except_fd_set;

	FD_ZERO (&input_fd_set);
	FD_ZERO (&except_fd_set);
	FD_SET  (0, &input_fd_set);
	FD_SET  (1, &except_fd_set);

	static struct timeval timeout;
	timeout.tv_sec = timeout.tv_usec = 0;
	static int max_fd = 2;
	// XXX -- track exceptions (in the select(2) sense) here?

	int retval = select(max_fd, &input_fd_set, NULL, &except_fd_set, &timeout);

	if (retval < 0)  // Error occured.
		return false;

	if (retval == 0)  // timeout.
		return false;

	if (FD_ISSET (0, &input_fd_set)) // There is input
		return true;

	if (FD_ISSET (1, &except_fd_set)) // Exception on write,
		exit (1);                       // probably, connection closed.

	return 0;
}

bool IsPipe()
{
	return g_pipe != 0;
}

#endif

