pragma solidity ^0.4.21;

contract Users{

struct  user_profile {
    string surname;
    string name;
    uint id;
    string address_line1;
    string address_line2;
    string postcode;

    string email;
    string username;
    string password;
}

uint private number_of_users;

mapping(uint => uint) private credits;
mapping(string => user_profile) internal users;

function GenerateID() constant returns(uint){
  //Will generate a random id number as uint.
  uint id = 1;
  return id;
}

function _Register(string _surname, string _name, string line1, string line2,
                string _postcode, string _email, string _username, string _password) internal returns(string) {
  user_profile storage user;
  user.surname = _surname;
  user.name = _name;
  user.id = GenerateID();
  user.address_line1 = line1;
  user.address_line2 = line2;
  user.postcode = _postcode;
  user.email = _email;

  user.username = _username;
  user.password = _password;

  users[user.username] = user;
  credits[user.id] = 0;

  number_of_users++;

  return user.username;
}


}


contract App is Users{

function Register(string _surname, string _name, string line1, string line2,
                string _postcode, string _email, string _username, string _password) public returns(bool success){

    string memory username = _Register(_surname, _name, line1, line2, _postcode, _email, _username, _password);
    //Check whether user registration successful.
    if(users[username].id > 0) return true;

    return false;
}


function Login(string username, string password) public returns(bool success){

    if(keccak256(password) == keccak256(users[username].password)) {
        //Go to vip area.
        return true;
    }

    return false;
}


}