#define _CRT_SECURE_NO_DEPRECATE

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <time.h>
#include <windows.h>

static void random_gotoxy(void);
static void help(void);
static void press_key();

int main(){
	unsigned char ch = 0;
	unsigned char ch_2 = 0;

	printf("[F1]\t\tHelp\n[F2]\t\tSpusti\n[F10/ESC]\tUkonci");

	do{
		if (_kbhit()){
			ch = _getch();
			switch (ch) {
			case 0x00:
				ch_2 = _getch();

				if(ch_2 == 59) // F1
					help();
				else if(ch_2 == 60) // F2
					press_key();
				else if(ch_2 == 68){ // F10
					system("cls");
					printf("Koniec...\n\n");
					return 0;
				}
			break;

			default:
			break;
			}
		}
	}while (ch != 27);

	system("cls");
	printf("Koniec...\n\n");
	return 0;
}

static void random_gotoxy(void){
	COORD coord = {0,0};

	coord.X = rand() % 50 + 1;
	coord.Y = rand() % 10 + 1;

	SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), coord);
}

static void help(void){
	system("cls");
	printf("This program measure your reaction time by pressing the given symbol.\n");
	printf("Possible symbols are from ASCII(48) - ASCII(122)");
}

static void press_key(){
	time_t start_watch, stop_watch;
	double timer;
	char symbol_to_guess = 0;
	char symbol_typed = 0;
	FILE *fw;

	system("cls");
	start_watch = clock();

	//symboly od 48-122 .. cisla ..velke a male pismena + tie medzi tym
	symbol_to_guess = rand() % 122;
	if(symbol_to_guess < 48)
		symbol_to_guess += 48;

	random_gotoxy();
	printf("%c", symbol_to_guess);

	do{
		symbol_typed = _getch();
	}
	while(symbol_typed != symbol_to_guess);

	system("cls");

	if(symbol_typed == symbol_to_guess){
		stop_watch = clock();

		timer = (stop_watch - start_watch) / (double)CLOCKS_PER_SEC;

		printf("You reaction time is %.3fms!", timer);
	}

	fw = fopen("data.txt", "a");
	fprintf(fw, "'%c' - %.3fs\n", symbol_to_guess, timer);
	fclose(fw);

	Sleep(2000);
	system("cls");
	Sleep(500);
	main();
}