#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
/*
 * Version "secured" of the challenge
 *
 **/
void rules_explanation(void) {
	printf("==========================================\n");
	printf("+> The rules are very simple:           <+\n");
	printf("+> The one that take the last match win <+\n");
	printf("==========================================\n");
}
int check_decision(char decision) {
	return (decision >= 1 && decision <= 3); 
}

int human_turn(int *nb_matches) {
	unsigned int decision=0;
	char buffer[10];
	printf("How many matches do you want to take ? (1-3)\n");
	fgets(buffer, sizeof(buffer), stdin);
	decision = strtoul(buffer,NULL,10);
	if (!check_decision(decision)) {
		printf("Are you trying to cheat ??\n");
		return 0;
	}
	*nb_matches -= decision;
	printf("You've taken %i match(es)\n", decision);
	return 1;

}

void computer_turn(int *nb_matches) {
	unsigned int decision=0;
	if (*nb_matches == 4) {
		decision = 4;
		*nb_matches = 0;
		printf("HUMMM\n");
		sleep(1);
		printf("HUMMMMMMMMMMM\n");
		sleep(1);
		printf("Wait, I got this !\n");
		sleep(1);
	} else if (*nb_matches % 4 == 0) {
		decision = 1;
		*nb_matches -= decision;
	} else {
		decision = (*nb_matches % 4);
		*nb_matches -= decision;
	}
	printf("The computer has taken %i match(es)\n", decision);
}
int main(void) 
{	
	// We set the number of matches
	srand(time(NULL));
	char pass[80];
	FILE *fd;
	int nb_matches = 10 + rand() % 40;
	int turn=0;
	// Game settings
	rules_explanation();
	printf("There are %u match(es)\n", nb_matches);
	// Now we begin the game
	while (nb_matches > 0) {
		if (turn==0) {
			if (human_turn(&nb_matches)) 
				turn=1;
			else
				turn=0;
		} else {
			computer_turn(&nb_matches);
			turn=0;
		}
		printf("there are %i match(es) remaining\n", nb_matches);
	}
	if (!turn) { 
		printf("You lose !\n");
	} else {
		printf("How did you do this ?\n");
		printf("password is : \n");
		fd = fopen(".password","r");
		fgets(pass, sizeof(pass), fd);
		printf("%s",pass);
		printf("You win !\n");
	}
	return EXIT_SUCCESS;
}