#include <iostream>
#include <string>
#include <vector>
#include <fstream>
using namespace std;

class user
{
	friend class db;
	string username;
	string password;
	string email;
	public:
	user(string u, string p, string e)
	{
		username = u;
		password = p;
		email = e;
	}
	~user()
	{
	}
};
class db
{
	string dbfilename;
	vector<user> users;
	public:
	~db()
	{

	}
	int find_user(string u)
	{
		for(int i=0;i<users.size();i++)
		{
			if(users[i].username == u)
			{
				return i;
			}
		}
		return -1;
	}
	bool update()
	{
		fstream file;
		for(int i=0;i<users.size();i++)
		{
			if(i==0)
			{
				file.open(dbfilename.c_str(), ios::out);
				file << users[i].username << " " << users[i].password << " " << users[i].email << endl;
				file.close();
			}
			else
			{
				file.open(dbfilename.c_str(), ios::out|ios::app);
				file << users[i].username << " " << users[i].password << " " << users[i].email << endl;
				file.close();
			}
		}
		return true;
	}
	bool add_user(string u, string p, string e, int flag)
	{
			if(!u.empty() && !p.empty() && !p.empty() && find_user(u) == -1)
			{
				user NewUsr(u,p,e);
				users.push_back(NewUsr);
				if(flag==1)
				{
					update();
				};
				return true;
			}
			return false;
	}
	db(string filename)
	{
		dbfilename=filename;
		fstream file;
		file.open(dbfilename.c_str());
		string cuvant, u, p, e;
		for(int i=0;file>>cuvant;i++)
		{
			u,p,e = "";
			if(i == 0)
			{
				u = cuvant;
			}
			if(i == 1)
			{
				p = cuvant;
			}
			if(i == 2)
			{
				e = cuvant;
				add_user(u,p,e,0);
				i=-1;
			}
		}
		file.close();
	}
	void print()
	{
		for(int i=0;i<users.size();i++)
		{
			cout << "[" << i << "]: " \
				 << users[i].username \
				 << " " << users[i].password \
				 << " " << users[i].email << endl;
		}
	}
	bool delete_user(string u)
	{
		int position = find_user(u);
		if(position != -1)
		{
			users.erase(users.begin()+position);
			update();
			return true;
		}
		return false;
	}
	bool auth(string u, string p)
	{
		int position = find_user(u);
		if(position != -1)
		{
			if(users[position].password == p)
			{
				return true;
			}
		}
		return false;
	}
};
int main()
{
	db DB("Useri");
	DB.print();//Listare utilizator
	//Login
	string u,p,e;
	cout << "Login:\n"\
		 << "User: ";
	cin >> u;
	cout << "Pass: ";
	cin >> p;
	if(DB.auth(u,p))
	{
		cout << "Authentication successful!\n";
	}
	else
	{
		cout << "Authentication Failed!\n";
	}
	//Register.
	u = "";p = "";e = "";
	cout << "Register new account:\n"\
		 << "User: ";
	cin >> u;
	cout << "Pass: ";
	cin >> p;
	cout << "Mail: ";
	cin >> e;
	if(DB.add_user(u,p,e,1))
	{
		cout << "Registration successful!\n";
	}
	else
	{
		cout << "Registration Failed!\n";
	}
}