#include <iostream>
#include <string>
#include <fstream>
#include <cstring>

using namespace std;

int adminView();
int studentView();
int studentLogin();
int checkCredentials(string userName, string password);
int getAllStudentsbyRollNo();
int deleteAllStudents();
int deleteStudentbyRollno();
int checkListOfStudentsRegistered();
int checkPresenseCountbyRollno();
int getListOfStudentsWithTheirPresenseCount();
int registerStudent();
int adminLogin();
int registerStudent();
int markMyAttendance(string username);
int countMyAttendance(string username);
int delay();

int delay()
{
	for(int i = 0; i<3; i ++)
	{
		cout<<"\n Saving Records ...";
	        for(int ii = 0; ii<20000; ii ++)
	        {
		    	for(int iii = 0; iii<20000; iii ++)
		       	{

			}
	        }
   }

   	cout<<"\n Exiting Now ...";
   	for(int i = 0; i<3; i ++){
	   for(int ii = 0; ii<20000; ii ++) {
   	     for(int iii = 0; iii<20000; iii ++){
		 }
            }
        }

return 0;
}

int adminView()
{
    int goBack = 0;
    while(1)
    {
		system("cls");
		cout<<"\n 1 Register a Student";
		cout<<"\n 2 Delete All students name registered";
		cout<<"\n 3 Delete student by rollno";
		cout<<"\n 4 Check List of Student registered by userame";
		cout<<"\n 5 Check presense count of any student by Roll No";
		cout<<"\n 6 Get List of student with their attendance count";
		cout<<"\n 0. Go Back <- \n";
		int choice;

		cout<<"\n Enter you choice: ";
		cin>>choice;

		switch(choice)
		{
			case 1: registerStudent();break;
			case 2: deleteAllStudents(); break;
			case 3: deleteStudentbyRollno(); break;
			case 4: checkListOfStudentsRegistered(); break;
			case 5: checkPresenseCountbyRollno(); break;
			case 6: getListOfStudentsWithTheirPresenseCount(); break;
			case 0: goBack = 1;break;
	                default: cout<<"\n Invalid choice. Enter again ";
	                 getchar();
	   }

	   if(goBack == 1)
	   {
	   	break; //break the loop
           }

   }


   return 0;

}

int studentLogin()
{
    system("cls");
    cout<<"\n -------------------- Student Login -----------------";
    studentView();
    delay();
    return 0;
}


int adminLogin()
{
	system("cls");
	cout<<"\n -------------------- Admin Login -----------------";

        string username;
	string password;

	cout<<"\n Enter username : ";
	cin>>username;
	cout<<"\n Enter password : ";
	cin>>password;

	if(username=="admin" && password=="admin@2")
	{
	    adminView();
	    getchar();
	    delay();
       }
       else
       {
        cout<<"\n Error ! Invalid Credintials..";
        cout<<"\n Press any key for main menu ";
        getchar();getchar();
      }

   return 0;

}


int checkStudentCredentials(string username, string password)
{
	// read file line by line & check if username-password.dat exist?
	// if it exsist return 1 else 0

	ifstream read;
	read.open("db.dat");

	if (read) {
        // The file exists, and is open for input
        int recordFound = 0;
        string line;
        string temp = username +".dat";
        cout<<"\n file name is : "<<temp;
        while(getline(read, line)) {
        	if(line == temp)
        	{
        		recordFound = 1;
        		break;
		}
        }

        if(recordFound == 0)
            return 0;
        else
           return 1;
       }
       else
       {
    	   return 0;
       }

}





int getAllStudentsbyName()
{
cout<<"\n List of All Students by their Name \n";

cout<<"\n Please any key to continue..";
getchar();getchar();

return 0;

}

int getAllStudentsbyRollNo()
{
cout<<"\n List of All Students by their Roll No \n";

cout<<"\n Please any key to continue..";
getchar();getchar();

return 0;

}

int deleteStudentbyRollno()
{

cout<<"\n Delete any Student by their Roll No \n";

cout<<"\n Please any key to continue..";
getchar();getchar();

return 0;
}


int checkPresenseCountbyRollno()
{

cout<<"\n Check presense count of any Student by Roll No \n";

cout<<"\n Please any key to continue.."	;
getchar();getchar();

return 0;

}

int checkAllPresenseCountbyRollno()
{
cout<<"\n Check presense count of All Students by Roll No & Name \n";

cout<<"\n Please any key to continue.."	;
getchar();getchar();

return 0;
}

int studentView()
{
cout<<"\n ---------------- Student Login----------------- \n";

string username, password;

cout<<"\n Enter username : ";
cin>>username;

cout<<"\n Enter password : ";
cin>>password;

int res = checkStudentCredentials(username, password);

if(res  == 0)
{
   cout<<"\n Invalid Credentials !!";
   cout<<"\n Press any key for Main Menu..";
   getchar(); getchar();
   return 0;
}

    int goBack = 0;
	while(1)
    {
		system("cls");

		cout<<"\n 1 Mark Attendance fo Today ";
		cout<<"\n 2 Count my Attendance";
		cout<<"\n 0. Go Back <- \n";
		int choice;

		cout<<"\n Enter you choice: ";
		cin>>choice;

		switch(choice)
		{
			case 1: markMyAttendance(username); break;
			case 2: countMyAttendance(username); break;
			case 0: goBack = 1;break;
	                default: cout<<"\n Invalid choice. Enter again ";
	                getchar();
	   }

	   if(goBack == 1)
	   {
	   	break; //break the loop
           }

   }

}

int markMyAttendance(string username)
{
cout<<"\n Mark Attendance for today !!";

cout<<"\n Please any key to continue..";

getchar();getchar();

return 0;
}

int countMyAttendance(string username)
{
cout<<"\n Count my attendace for today !!";

cout<<"\n Please any key to continue..";

getchar();getchar();

return 0;
}

int deleteAllStudents()
{
	cout<<"\n In delete all students !!";

	cout<<"\n Please any key to continue..";

	getchar(); getchar();
	return 0;
}


int checkListOfStudentRegistered()
{
	cout<<"\n List of All registered registered !!";

        cout<<"\n Please any key to continue..";
	getchar(); getchar();
	return 0;
}

int getListOfStudentsWithTheirPresenseCount()
{
	cout<<"\n All Students with their Presense count !!";

        cout<<"\n Please any key to continue..";
	getchar(); getchar();
	return 0;
}

int checkListOfStudentsRegistered(){
    cout<<"\n ---------- Check List of Student Registered by Username----------- ";

	    //check if record already exist..
    ifstream read;
    read.open("db.dat");

    if(read)
    {       int recordFound =0;
	    string line;
    	    while(getline(read, line)) {

    	    	char name[100];
    	    	strcpy(name, line.c_str());
    	    	char onlyname[100];
    	    	strncpy(onlyname, name, (strlen(name) - 4));
    	    	cout<<" \n " << onlyname;

            }
    read.close();
    }
    else
    {
    	cout<<"\n No Record found :(";
    }


    cout<<"\n Please any key to continue..";
    getchar(); getchar();
    return 0;
}


int registerStudent()
{
    cout<<"\n ----- Form to Register Student ---- \n";

    string name, username, password, rollno, address, father, mother;

    cout<<"\n Enter Name : ";     cin>>name;

    cout<<"\n Enter Username : ";     cin>>username;


    cout<<"\n Enter password : ";     cin>>password;

    cout<<"\n Enter rollno : ";     cin>>rollno;
    getchar();

    char add[100];
    cout<<"\n Enter address : ";     cin.getline(add, 100);

    cout<<"\n Enter father : ";     cin>>father;

    cout<<"\n Enter mother : ";     cin>>mother;

    //check if record already exist..
    ifstream read;
    read.open("db.dat");

    if(read)
    {      int recordFound =0;
	   string line;
    	    while(getline(read, line)) {
        	if(line == username+".dat" )
        	{
        		recordFound = 1 ;
        	    break;
			}
        }
        if(recordFound == 1)
        {
        	cout<<"\n Username already Register. Please choose another username ";
        	getchar(); getchar();
        	delay();
        	read.close();
        	return 0;
		}
	}
    read.close();

        ofstream out;
	out.open("db.dat", ios::app);
	out<<username+".dat"<<"\n";
	out.close();

	ofstream out1;
	string temp = username+".dat";
	out1.open(temp.c_str());
	out1<<name<<"\n"; 	out1<<username<<"\n"; 	out1<<password<<"\n";
	out1<<rollno<<"\n"; 	out1<<add<<"\n"; 	out1<<father<<"\n";
	out1<<mother<<"\n";
	out1.close();

	cout<<"\n Student Registered Successfully !!";

        cout<<"\n Please any key to continue..";
	getchar(); getchar();
	return 0;
}





int main(int argc, char** argv) {

	while(1)
	{
		system("cls");

		cout<<"\t\t\t\t\t Attendance Management System \n";
		cout<<"-------------------------------------------------------------------------\n\n";

		cout<<"1. Student Login\n";
		cout<<"2. Admin Login\n";

		cout<<"0. Exit\n";
		int choice;

		cout<<"\n Enter you choice: ";
		cin>>choice;

		switch(choice)
		{
			case 1: studentLogin(); break;
			case 2: adminLogin(); break;
			case 0:
			        while(1)
			        {
					    system("cls");
			        	cout<<"\n Are you sure, you want to exit? y | n \n";
			        	char ex;
			        	cin>>ex;
			        	if(ex == 'y' || ex == 'Y')
			        		exit(0);
			        	else if(ex == 'n' || ex == 'N')
	                     {
	                     	 break;
	                     }
	                     else{

	                     	cout<<"\n Invalid choice !!!";
	                     	getchar();
	                     }


                 	 }	break;

            default: cout<<"\n Invalid choice. Enter again ";
                     getchar();

		}

	}

	return 0;
}