#include <iostream>
#include <string>
#include <fstream>
#include<stdlib.h>
#include<string.h>
#include<ctime>
using namespace std;
void signIn();
void signUp();
void admin();

int main(){
    int choicE;
    cout<<"====================================================="<<endl;
    cout<<"=============College Management System==============="<<endl;
    cout<<"====================================================="<<endl;
    cout<<endl<<endl;
    cout<<"1) Student sign in"<<endl;
    cout<<"2) Student sign up"<<endl;
    cout<<"3) Admin"<<endl<<endl;
    cout<<"Enter Your Choice: ";
    cin>>choicE;

    switch(choicE)
        {
                case 1:
                        signIn();
                        break;
                case 2:
                        signUp();
                        break;
                case 3:
                        admin();
                        break;
                default:
                        system("cls");
                        cout<<"Wrong choice!\nTry again!"<<endl;
                        main();

        }


    return 0;
}
void signIn(){
        int counter,id, acount;
        string user,pass,u,p,m;
        system("cls");
        cout<<"please enter the following details"<<endl;
        cout<<"USERNAME :";
        cin>>user;
        cout<<"PASSWORD :";
        cin>>pass;

        ifstream f("student.txt");
        while(f>>id>>u>>m>>p)
        {
                if(u==user && p==pass)

                {
                        counter=1;
                        system("cls");
                }else
                {
                cout<<"Either username or password is incorrect";
                main();
                }
        }
        f.close();
        if(counter==1)
        {
            int choiCe;
                cout<<"\nWelcome"<<user<<"!"<<endl<<endl;
				cout<<"1) Ask Question"<<endl;
                cout<<"2) Check Messages"<<endl;
                cout<<"3) Account info"<<endl;
                cout<<"Enter anything else to exit."<<endl<<endl;
                cout<<"Enter your choice: ";
                cin>>choiCe;
                cout<<endl;
                if(choiCe==1){
                    string question;
                    cout<<"Enter Your Question: "<<endl;
                    cin>>question;
                    getline(cin, question);
                    cout<<question<<endl;
                    ofstream g("question.txt",ios::app);
                    g<<question<<endl;
                    cout<<"Question will be answered shortly. Come back later!"<<endl;

                }else if(choiCe==2){

                    string q,q2,a;
                    int count;
                    ifstream y("question.txt");
                    ifstream x("answer.txt");
                        while(y>>q && x>>q2>>a)
                        {
                                if(q==q2)
                                {
                                        count=1;
                                }
                        }
                        y.close();
                        x.close();
                        if(count==1){
                            cout<<q2<<a;
                        }
                }else if(choiCe==3){

                    ifstream h("student.txt");
                    while(h>>id>>u>>m>>p){
                        if(true){
                            acount=1;
                        }
                    }
                    h.close();
                    if(acount==1){

                        int no;
                        cout<<"Major: "<<m<<endl;
                        cout<<"Username: "<<u<<endl;
                        cout<<"Password: "<<p<<endl;
                        cout<<"Press 1 to exit: ";
                        cin>>no;
                        if(no==1){ //16777216
                            main();
                        }
                    }
                }else{
                    main();
                }


        }

}
void signUp(){
    string nuser,npass, nmajor;
    string fname, lname;
        system("cls");
        cout<<"Enter First Name: ";
        cin>>fname;
        cout<<"\nEnter Last Name: ";
        cin>>lname;
        cout<<"\nCreate a Username: ";
        cin>>nuser;
        cout<<"\nEnter Major: ";
        cin>>nmajor;
        cout<<"\nEnter the password: ";
        cin>>npass;
        int id=rand();
        ofstream i("student.txt",ios::app);
        i<<id<<' '<<nuser<<' '<<nmajor<<' '<<npass<<endl;
        system("cls");
        cout<<"\nRegistration Sucessful\n";
        cout<<"Your ID is: "<<id<<"\n Remember it!";
        main();
}
void admin()
{
    int adpass, choIce;
    cout<<"Enter Password: "<<adpass<<endl;
    if(adpass==1234)
    {
        cout<<"1) View Student Info"<<endl;
        cout<<"2) Answer Questions"<<endl;
        cout<<"3) Exit"<<endl<<endl;
        cout<<"Enter your choice: "<<choIce;

        if(choIce==1)
        {
            int aid,acount,id;
            string u,m,p;
            cout<<"Enter student ID"<<aid;
            ifstream j("student.txt");
            while(j>>id>>u>>m>>p){
                if(id==aid){
                    acount=1;
                }
            }
            j.close();
            if(acount==1){
                int no;
                cout<<"Major: "<<m<<endl;
                cout<<"Username: "<<u<<endl;
                cout<<"Password: "<<p<<endl;
                cout<<"Press 1 to exit: "<<no;
                if(no==1){
                    main();
                }
            }
        }else if(choIce==2)
        {
            fstream l("question.txt");

            if(l.is_open()){
                cout<<l.rdbuf();
            }
            l.close();
            string q,a;
            cout<<"Enter the question you would like to answer:"<<endl;
            getline(cin,q);
            cout<<"Enter the answer:"<<endl;
            getline(cin,a);
            ofstream z("answer.txt",ios::app);
            z<<q<<a<<endl;
        }else{
            main();
        }
    }
}