#include<iostream>
#include<fstream>
#include<string>
#include<cstdlib>
#include<windows.h>
#include<dos.h>
#include<math.h>
#include<conio.h>
using namespace std;

class login{
	protected:
		string username,password,securityQuestion;
		string fileUser,filePassword,fileSecQues;
	public:
		login();
		int loginCheck();
		void signUp();
		int forgotPassword();
};


login::login()
{
	int n;
	start_Page:
	cout<<"\n1. Login\n2. Register\n3. forgotPassword\n4. Exit";
	cout<<"\n-----------------------\n";
	cout<<"Enter your choice: ";
	cin>>n;
	int login_retry=0,forgot_try=0;
	switch(n)
	{
		case 1:
			{
				system("cls");
				login_retry=loginCheck();
				if(login_retry>0)
				{
					system("cls");
					cout<<"Wrong Username and password";
					cout<<"\n If you haven't created account then please Sign Up"<<endl;
					goto start_Page;
				}
			}
			break;
		case 2:
			signUp();
			system("cls");
			goto start_Page;
			break;
		case 3:
			system("cls");
			forgot_try=forgotPassword();
			switch(forgot_try)
			{
				case 0:
					break;
				case 1:
					cout<<"There is no such user in our database"<<endl;
					cout<<"Please register to use our services."<<endl;
					break;
				case 2:
					cout<<"Sorry but your answer doesn't match with the answer stored in our database.";
					cout<<"Please try again from the begining.";
					break;
				default:
					cout<<"This is default";
			}
			getch();
			system("cls");
			goto start_Page;
			break;
		case 4:
			exit(2);
		default:
			cout<<"What?? There's no such option.\n Please choose any valid option to proceed";
			goto start_Page;
		}

}

void login::signUp()
{
	system("cls");
	cout<<"Hello there....Lets create a new account\n";
	cout<<"Please fill all the details carefully and remember all the details\n";
	cout<<"Enter Username:  ";
	cin>>username;
	cout<<"Enter password: ";
	cin>>password;
	cout<<"For your security purpose please answer this security question: ";
	cout<<"\n IN WHICH COUNTRY YOU WANT YOUR DREAM JOB ?";
	cout<<"\nYour Answer: ";
	cin>>securityQuestion;
	ofstream file;
	file.open("CoolCab2.txt",ios::app);
	file<<username<<' '<<password<<' '<<securityQuestion<<'\n';
	cout<<"Congratulations!!! You have successfully created your account";
	cout<<"\nPlease press any button to continue to the main page";
	getch();
}
int login::loginCheck()
{
	cout<<"Enter Username: ";
	cin>>username;
	cout<<"Enter Password: ";
	cin>>password;
	ifstream file;
	file.open("CoolCab2.txt");
	file.seekg(0);
	while(!file.eof())
	{
		file>>fileUser>>filePassword>>fileSecQues;
		if(username==fileUser && password== filePassword)
		{
			cout<<"Login Successful";
			cout<<"\nCOOLCABS WELCOMES YOU HAVE A SAFE AND NICE TRIP\n";
			getch();
			return 0;
		}
	}
	return 1;
}

int login::forgotPassword()
{
	system("cls");
	cout<<"Enter Username: ";
	cin>>username;
	int userFound=0;
	ifstream file;
	file.open("CoolCab2.txt");
	file.seekg(0);
	while(!file.eof())
	{
		file>>fileUser>>filePassword>>fileSecQues;
		if(username==fileUser)
		{
			userFound=1;
			break;
		}
	}
	if(userFound==1)
	{
		cout<<"Welcome "<<username<<endl;
		cout<<"Please answer your security question:"<<endl;
		cout<<"IN WHICH COUNTRY YOU WANT YOUR DREAM JOB ?";
		cout<<"\nYOur Answer: ";
		cin>>securityQuestion;
		if(securityQuestion==fileSecQues)
		{
			cout<<"Please wait.......Searching the database.......";
			Sleep(2000);
			cout<<"\nSearch Complete";
			cout<<"\nYour password is: "<<filePassword;
			getch();
			return 0;
		}
		else
		return 2;
	}

	return 1;
	getch();
}
int main()
{
	login l;
	l.loginCheck();
	l.signUp();
}