#include <iostream>
#include<fstream>
#include <iomanip>
#include <vector>
#include <Windows.h>
#include<stdlib.h>
#include <string>
using namespace std;
////////////////////////////////////////////////////////////
//                      STRUCTURES                        //
////////////////////////////////////////////////////////////
struct Student
{
    string name;
    string id;
    int sectionNum;
    string academic_year;
    vector<double> grades;
    string totalGrade;
    double totalGPA;
};


////////////////////////////////////////////////////////////
//                      GLOBAL VARS                       //
////////////////////////////////////////////////////////////
bool isRunning = true;
string c_AcademicYear = "";
string c_Year = "";
////////////////////////////////////////////////////////////
//                  FUNCTION  DEFINITIONS                 //
////////////////////////////////////////////////////////////
void mainUI();

template<typename T>
void inputW_errorHandle(T &x,int maxnum,int minnum);

void load_AcademicYear(string &A_Y);
void adminPanel();
void adminMenu();
void admin_AddAcademicYear();
bool ifExists(string a_yname);
////////////////////////////////////////////////////////////
//                      M A I N                           //
////////////////////////////////////////////////////////////
int main()
{
    while (isRunning)
    {
        mainUI();
        cout <<" [1] Load Academic Year"<<endl
            <<" [2] Load Division"<<endl
            <<" [3] Search For Student"<<endl
            <<" [4] View All Students Info"<<endl
            <<" [5] Admin Panel (Add,Delete,Edit)"<<endl
            <<"------------------------------------------------------------------------"<<endl
            <<"Your Choice : ";
        int c;
        inputW_errorHandle(c,5,1);
        switch (c)
        {
            case 1:
                load_AcademicYear(c_AcademicYear);
                break;

            case 2:
                break;

            case 3:
                break;

            case 4:
                break;

            case 5:
                adminPanel();
                break;
        }

    }



    return 0;
}


////////////////////////////////////////////////////////////
//                       FUNCTIONS                        //
////////////////////////////////////////////////////////////

template<typename T>  // This means that the function can use any datatype
void inputW_errorHandle(T &x, int maxnum,int minnum)
{
    while(!(cin >> x) || (x>maxnum || x<minnum))
    {
        cin.clear();
        cin.ignore(1000, '\n');
        cout << "Invalid input. Please enter a number from ("<<minnum<<"-"<<maxnum<<  "). Try again: ";
    }
}

bool ifExists(string f_name)
{
    ifstream file;
    file.open(f_name.c_str());

    if (file.is_open())
    {
        file.close();
        return true;
    }
    else
        return false;


}

void mainUI()
{
    if (c_AcademicYear=="")
    {
        c_AcademicYear="None";
        c_Year="None";
    }
    if (c_AcademicYear !="" && c_Year=="")
        c_Year="None";

    system("cls");
        cout <<"////////////////////////////////////////////////////////////////////////"<<endl
            <<"//"<<"\t\t  S T U D E N T   M A N A G E M E N T"<<"   \t      //"<<endl
             <<"////////////////////////////////////////////////////////////////////////"<<endl;
        cout <<"  \t\t Currently Loaded Academic Year: "<<c_AcademicYear<<endl;
        cout <<" \t\t Currently Loaded Divsion: "<<c_Year<<endl;
        cout <<"------------------------------------------------------------------------"<<endl;
}

void load_AcademicYear(string &A_Y)
{
    mainUI();


}

void adminMenu()
{
    mainUI();
    cout <<" [1] Add Academic Year"<<endl
            <<" [2] Add Student"<<endl
            <<" [3] Delete Student Info"<<endl
            <<" [4] Edit Student Info"<<endl
            <<" [5] User Panel "<<endl
            <<"------------------------------------------------------------------------"<<endl
            <<"Your Choice : ";
    int n;
    inputW_errorHandle(n,5,1);
    switch (n)
        {
            case 1:
                admin_AddAcademicYear();
                break;

            case 2:
                break;

            case 3:
                break;

            case 4:
                break;

            case 5:
                break;
        }

}

void adminPanel()
{
    mainUI();
    string n , p;
    cout <<"Username : ";
    cin>>n;
    cout <<"Password : ";
    cin>>p;
    if ((n=="tohamy" && p=="tohamyfcis") || (n=="moda" && p=="modafcis") || (n=="khafagy" && p=="khafagyfcis"))
    {
        cout <<"Login Successful !";
        Sleep(1000);
        adminMenu();
    }

    else
    {
        cout <<" Incorrect Login Information ! ";
        Sleep(1000);
    }

}

void admin_AddAcademicYear()
{
    mainUI();
    char choice;
    string year;
do
{
    cout << "Please enter the academic year number you want to add : ";
    int a_y;
    inputW_errorHandle(a_y,2015,1900);
     year = to_string(a_y) +"-" +to_string(a_y+1);
     string fnamecheck = year+".txt";
     if(ifExists(fnamecheck))
     {
         cout <<"Academic Year Already Exists. Please retry !\n";
         choice = 'n';
     }
     else
     {
    cout << "Is this ok ? ["<<year<<"]";
    cin >>choice;
     }
}
while (choice=='n'||choice=='N');
    string temp = year;
    year = year+".txt";
    fstream file;
    file.open(year.c_str(),ios::out|ios::app);

    if (!file.is_open())
    {
        cout <<"Error Creating Academic Year !";
        Sleep(1000);
    }
    else
    {
        cout <<"Academic Year Created Successfully!";
        Sleep(1000);
        fstream file_y;
        file_y.open("Academic_Years.txt",ios::out|ios::app);
        if (!file_y.is_open())
        {
            cout <<"Error Registering Academic Year in Database !";
            remove(year.c_str());
            Sleep(1000);
        }

        else
        {
            file_y << temp<<endl;
        }
        file_y.close();
        file.close();
    }


}