#include <stdio.h>
#include <string.h>
#include <stdlib.h>

bool authenticate(char* usr,char *pwd)
{
	char user[10];
	char password[10];
	char userAuth[10];
	char passAuth[10];
	strcpy(user,usr);
	strcpy(password,pwd);

	FILE *readfile;
	readfile=fopen("users.txt", "r");

	while (fscanf(readfile,"%s %s", userAuth,passAuth) != EOF)
	{
		if ((strcmp(user,userAuth) == 0) && (strcmp(password,passAuth) == 0))
		{
			printf ("Authenticated.. moving on to console..\n");
			return true;
		}
	}

	fclose(readfile);
	return false;
}

void createNewUser()
{
	char username[10];
	char password[10];

	FILE *appendfile;
	appendfile=fopen("users.txt", "a");

	printf("\nEnter a username: ");
	scanf("%s", username);
	printf("Enter a password: ");
	scanf("%s", password);

	fprintf(appendfile, "%s ",username);
	fprintf(appendfile, "%s\n",password);

	printf ("\nNew user added.\n");

	fclose(appendfile);
}

void viewInfo()
{
	char user[10];
	char pass[10];

	FILE *readfile;
	readfile=fopen("users.txt", "r");

	printf("\nHere are a list of users on the system:\n\n");

	while (fscanf(readfile,"%s %s",user,pass) != EOF)
	    printf("Username: %s | Password: %s\n",user, pass);

	printf("\nList completed...\n");
	fclose(readfile);
}

// wanna overwrite the RET to 004011E0 and we're crashing at 42415a59
int main(int argc, char* argv[])
{
	char usr[50];
	char pwd[50];
	bool run = true;
	int selection=0;

	printf("Please enter username: ");
	scanf("%s",usr);
	printf("Please enter a password: ");
	scanf("%s",pwd);
	if (!(authenticate(usr,pwd)))
	{
		printf("access denied!\n");
		return 0;
	}

	while (run)
	{
		printf("\n******MENU*******\n");
		printf("[1] Add a user to the system\n");
		printf("[2] View current list of users on system\n");
		printf("[3] EXIT\n");
		printf("\nselection: ");
		scanf("%i",&selection);

		if (selection == 1)
			createNewUser();
		else if (selection == 2)
			viewInfo();
		else if (selection == 3)
			run = false;
	}
	return 1;
}