/**********************************************************************
	* programming_assignment_two.c
	* nurses software
	* 219322
	* version 1.0
	* *****************************************************************/
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

void screen();
void login();
void nursework();
void crypt(unsigned char pass[9]);
void verify(char name[9], unsigned char pass[9], char identity[5][6], char accesspw[5][9]);

int main()
{
  screen();

return 0;
}

void screen(void)
{
  char user[11], playerone[4][11];
  strcpy(playerone[0], "Nurse");
  strcpy(playerone[1], "nurse");
  strcpy(playerone[2], "Consultant");
  strcpy(playerone[3], "consultant");
  printf("                              INITIALISING  PROGRAM\n"
  "                           WELCOME TO: ACTION ON WEIGHT\n"
  "                    A Cheylesmore Software Focus Production\n"
  "           Please Identify your self. Are you a nurse? or a Consultant?:"), scanf("%s", user);
  if (strcmp(playerone[0], user)==0 || strcmp(playerone[1], user)==0)
  {
    login();
  }
  else if (strcmp(playerone[2], user)==0 || strcmp(playerone[3], user)==0)
  {
    printf("\n\n    This is the wrong program. Only accessible to NURSES.\n\n");
    return;
  }
  else
  {
    printf("\n\n         Enter a valid input please or close the program.\n\n");
    main();
  }
}

void login(void)
{
  char pass[9], name[9];
  printf("\n\n           |||||||| LOGIN AS A NURSE ||||||||\n");
  printf("                    username: "), scanf("%s", name);
  printf("                    password: "), scanf("%s", pass);
  printf("           ||||||||||||||||||||||||||||||||||\n");

  FILE * inf;
  int next = 0;
  char identity[5][6], accesspw[5][9];
  inf = fopen("nurse_intel.txt", "r");

  while (!feof(inf))
  {
  fscanf(inf, "%[^:]:%s%*[^\n]%*c", identity[next], accesspw[next]);
  next++;
  }
  crypt(pass);
  verify(name, pass, identity, accesspw);
}
void verify(char name[], unsigned char pass[], char identity[][6], char accesspw[][9])
{
  int next;
  for(next=0; next<6; next++)
  {
    if(strcmp(name, identity[next])==0 && strcmp(pass, accesspw[next])==0)
    {
      nursework();
    }
    else
    {
      printf("\n          wrong username or password. Try again.\n");
      login();
    }
  }
}
void nursework(void)
{
  printf("    //=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=/=//");
}
void crypt(unsigned char pass[])
{
  char encryption;
  int i, key=8;
  for(i = 0; pass[i] != '\0'; ++i){
    encryption = pass[i];
    if(encryption >= 'a' && encryption <= 'z'){
        encryption = encryption + key;
        if(encryption > 'z'){
            encryption = encryption - 'z' + 'a' - 1;
        }
        pass[i] = encryption;
    }
    else if(encryption >= 'A' && encryption <= 'Z'){
        encryption = encryption + key;
        if(encryption > 'Z'){
            encryption = encryption - 'Z' + 'A' - 1;
        }
        pass[i] = encryption;
    }
    else if(encryption >= '0' && encryption <= '9'){
        encryption = encryption + key;
        if(encryption > '9'){
            encryption = encryption - '9' + '1' - 2;
        }
        pass[i] = encryption;
    }
  }
  printf("               STARTING verification.");
}