#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
#include <cstdlib>
#include <ctime>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <limits>
#include <cctype>
#include <cmath>
#include <Windows.h>

using namespace std;
void rgs();
void Menu();
string Login();
int monsters();
void loading();
void edit(string user,int obexp);
void qns1();
void qns2();
void qns3();
void qns4();
void qns5();
void qns6();
void qns7();
void qns8();
void qns9();
void qns10();
int ErrorCheck();

int ans1, cLevel, cExp;
string charname, pw, user, pass;
bool access;


int main()
{
	loading();
	Sleep(3000);
	system("CLS");
	Menu();
	system("CLS");
	if (ans1==1)
	{
		Login();
	}
	else if (ans1==2)
	{
		rgs();
		system("CLS");
		main();
	}
	else
	{
		cout<<"You have entered an invalid option"<<endl;
		Sleep(2000);
		system("CLS");
		main();
	}
	system ("pause");
	return 0;
}
string Login()
{
	cout<<"Please enter your charater name: ";
	cin>>user;
	cout<<"Please enter your password: ";
	cin>>pass;

	int qexp;
	ifstream inFile;
    string username, password;
    inFile.open("users.txt");
    if (inFile.is_open())
    {
        while (!inFile.eof())
        {
            inFile >>username>>password>>cLevel>>cExp;
            if (user==username && pass==password)
			{
				access=true;
				break;
			}
		}
		if (access)
		{
			cout<<"You have login successfully!"<<endl;
			cout<<"You are allowed to enter 5 battles each login~"<<endl;
			Sleep(2000);
			for (int i=0; i<5;i++)
			{
			system("CLS");
			cout<<"You are in a fight now. Solve this question to defeat the monster!"<<endl;
			qexp=monsters();
			cout<<endl;
			if (cLevel=1)
			{qns1();
			edit(user,qexp);
			Sleep(2000);}
			else if (cLevel=2)
			{qns2();
			edit(user,qexp);
			Sleep(2000);}
			else if (cLevel=3)
			{qns3();
			edit(user,qexp);
			Sleep(2000);}
			else if (cLevel=4)
			{qns4();
			edit(user,qexp);
			Sleep(2000);}
			else if (cLevel=5)
			{qns5();
			edit(user,qexp);
			Sleep(2000);}
			else if (cLevel=6)
			{qns6();
			edit(user,qexp);
			Sleep(2000);}
			else if (cLevel=7)
			{qns7();
			edit(user,qexp);
			Sleep(2000);}
			else if (cLevel=8)
			{qns8();
			edit(user,qexp);
			Sleep(2000);}
			else if (cLevel=9)
			{qns9();
			edit(user,qexp);
			Sleep(2000);}
			else
			{qns10();
			edit(user,qexp);
			Sleep(2000);}
			}
		}
		else
		{
			cout<<"You have enter the wrong username/password!"<<endl;
			cout<<"Please try again!"<<endl;
			Sleep(2000);
			system("CLS");
			Login();
		}
	}
	else
	{
		cout<<"Error!"<<endl;
	}
	inFile.close();
	return user;


}

void Menu()
{
	cout<<"Welcome to dungeon hunter!"<<endl;
	cout<<"Choose a choice below."<<endl;
	cout<<"1. Login"<<endl;
	cout<<"2. Register a new account"<<endl;
	cout<<"Please enter your option: ";
	cin>>ans1;
}

void rgs()
{
	ifstream inFile;
    ofstream newuser;
    string username, password, passwordconfirm;
    inFile.open("users.txt", ios::app);
    newuser.open("users.txt", ios::app);
    bool uservalid=false;
    while (!uservalid)
    {
        cout << "Username: ";
        cin >> username;
        cout << "Password: ";
        cin >> password;
        cout << "Confirm password: ";
        cin >> passwordconfirm;
        int m=0;
        int k=0;
        while (inFile>>user>>pass)
        {
            m++;
            if (username!=user)
                k++;
        }
        if (m==k && password==passwordconfirm)
            uservalid=true;
        else if (m!=k)
            cout << "There is already a user with this username." << endl;
        else
            cout << "The passwords given do not match." << endl;
    }
    newuser << username << " " << password << " 1 0" << endl;
	cout<<"You have successfully registered an account!"<<endl;
	Sleep(3000);
    inFile.close();
    newuser.close();
}

int monsters()
{
	ifstream monstersFile;
	int mLevel, mExpA, mExpB, mExp;
	srand((unsigned int)time(NULL));//initialize random number generator;
	string monsters[10]={"Sandton","Tentacuno","Porypix","Snorbell","Paradon","Muqueen","Maromander","Nidodash","Hitmonchop","Voltchamp"};
	int r = rand()%10+1; //generate a number between 1-1

	monstersFile.open("monsters.txt");
	if(!monstersFile)
		cout<<"Not able to open text file\n";
	else
	{
		cout<<left<<setw(15)<<"Name"<<setw(15)<<"Level"<<"EXP"<<endl;
		while(!monstersFile.eof())
		{
			monstersFile>>mLevel>>mExpA>>mExpB;
			if(monstersFile.fail())
			{
				break;
			}
			else
			{
				if(cLevel==mLevel)
				{
					mExp=rand()%(mExpB-mExpA+1)+mExpA;
					cout<<left<<setw(15)<<monsters[r]<<setw(15)<<mLevel<<setw(15)<<mExp<<endl;
				}

			}

		}

	}
	monstersFile.close();
	return mExp;
}

void loading()
{
	cout<<"Welcome to dungeon ma(th)ster!"<<endl;
    cout << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << (char)255 << (char)255 << (char) 255<< (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << endl;
    cout << (char)178 << (char)178 << (char)178 << (char)255 << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << (char)255 << (char)178 << (char)178 << (char)178 << endl;
    cout << (char)178 << (char)178 << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << (char)178 << (char)178 << endl;
    cout << (char)178 << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << (char)178 << endl;
    cout << (char)178 << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << (char)178 << endl;
    cout << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << endl;
    cout << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << (char)178 << (char)178 << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << endl;
    cout << (char)255 << (char)255 << (char)255 << (char)255 << (char)255 << (char)255 << (char)178 << (char)178 << (char)255 << (char)255 << (char)255 << (char)255 << (char)255 << (char)255 << endl;
    cout << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << endl;
    cout << (char)178 << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << (char)178 << endl;
    cout << (char)178 << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << (char)178 << endl;
    cout << (char)178 << (char)178 << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << (char)178 << (char)178 << endl;
    cout << (char)178 << (char)178 << (char)178 << (char)255 << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << (char)255 << (char)178 << (char)178 << (char)178 << endl;
    cout << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << (char)255 << (char)255 << (char)255 << (char)255 << (char)178 << (char)178 << (char)178 << (char)178 << (char)178 << endl;

}

void edit(string user,int obexp)
{
    string username,pass,search;
    int lvl,nlvl, exp, nexp, mExp;
    ifstream ifile ("users.txt");
    ofstream ofile ("users2.txt");
    while (!ifile.eof())
    {
        ifile>>username>>pass>>lvl>>exp;
		nexp=exp+obexp;
        if(user==username)
        {
			if (nexp>0)
			{nlvl=1;}
			else if (nexp<1500)
			{nlvl=2;}
			else if (nexp<2200)
			{nlvl=3;}
			else if (nexp<3300)
			{nlvl=4;}
			else if (nexp<4500)
			{nlvl=5;}
			else if (nexp<6500)
			{nlvl=6;}
			else if (nexp<8700)
			{nlvl=7;}
			else if (nexp<8700)
			{nlvl=8;}
			else if (nexp<11200)
			{nlvl=9;}
			else if (nexp<14200)
			{nlvl=10;}
			else
			{nlvl=lvl;}

            ofile<<endl<<user<<" "<<pass<<" "<<nlvl<<" "<<nexp;
        }
        else
        {
            ofile<<endl<<user<<" "<<pass<<" "<<lvl<<" "<<exp;
        }
    cout<<"\r";
    ifile.close();
    ofile.close();
    remove("users.txt");
    int result=rename("users2.txt","users.txt");
    if (result==0)
        cout<<"File successfully renamed\n";
    else
    {
        while (result==0)
        {
            cout<<"Error renaming file, Retrying\n";
            result=rename("users2.txt","users.txt");
        }
    }
}
}

void qns1() // plus
{
	srand (time(NULL));
	int qn1 = rand() % 200 + 1;
	int qn2 = rand() % 100 + 1;
	int input;
	int qnsans;
	cout<<"Here is your question!"<<endl;
	cout<< qn1 <<"+"<< qn2<<endl;
	qnsans=qn1+qn2;
	bool Restart=true;
	while(Restart==true)
	{
		cout<<"Enter your answer : ";
		cin>>input;
		Restart = cin.fail();
		if(cin.fail()==true)
			cout<<"\nError, Invalid Choice, Please Key in a Numerical Value\n";
		else if(qnsans==input)// if no error is present
		{
			cout<<"You Won the round!"<<endl;
			Restart = false; // to allow do loop to end
		}
		else if(qnsans!=input)
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		else
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		cin.clear(); //Restart error flag
	}

}
//plus
void qns2()	//minus
	{
	srand (time(NULL));
	int qn1 = rand() % 100 + 1;
	int qn2 = rand() % 100 + 1;
	int input;
	int qnsans;
	cout<<"Here is your question!"<<endl;
	cout<< qn1 <<"-"<< qn2<<endl;
	qnsans= qn1-qn2;
	bool Restart=true;
	while(Restart==true)
	{
		cout<<"Enter your answer : ";
		cin>>input;
		Restart = cin.fail();
		if(cin.fail()==true)
			cout<<"\nError, Invalid Choice, Please Key in a Numerical Value\n";
		else if(qnsans==input)// if no error is present
		{
			cout<<"You Won the round!"<<endl;
			Restart = false; // to allow do loop to end
			system("Pause");
		}
		else if(qnsans!=input)
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		else
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		cin.clear(); //Restart error flag
	}

} // minus
//minus
void qns3()//times
	{
	srand (time(NULL));
	int qn1 = rand() % 20 + 1;
	int qn2 = rand() % 10 + 1;
	int input;
	int qnsans;
	cout<<"Here is your question!"<<endl;
	cout<< qn1 <<"*"<< qn2<<endl;
	qnsans= qn1*qn2;
	bool Restart=true;
	while(Restart==true)
	{
		cout<<"Enter your answer : ";
		cin>>input;
		Restart = cin.fail();
		if(cin.fail()==true)
			cout<<"\nError, Invalid Choice, Please Key in a Numerical Value\n";
		else if(qnsans==input)// if no error is present
		{
			cout<<"You Won the round!"<<endl;
			Restart = false; // to allow do loop to end
			system("Pause");
		}
		else if(qnsans!=input)
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		else
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		cin.clear(); //Restart error flag
	}

}
//times
void qns4()//plusplus
	{
	srand (time(NULL));
	double qn1 = rand() % 200 + 1;
	double qn2 = rand() % 100 + 1;
	double QN3 = rand()%100+1;
	double input;
	double qnsans;
	cout<<"Here is your question!"<<endl;
	cout<< qn1 <<"+"<< qn2<<"+"<<QN3<<endl;
	qnsans= qn1+qn2+QN3;
	bool Restart=true;
	while(Restart==true)
	{
		cout<<"Enter your answer : ";
		cin>>input;
		Restart = cin.fail();
		if(cin.fail()==true)
			cout<<"\nError, Invalid Choice, Please Key in a Numerical Value\n";
		else if(qnsans==input)// if no error is present
		{
			cout<<"You Won the round!"<<endl;
			Restart = false; // to allow do loop to end
			system("Pause");
		}
		else if(qnsans!=input)
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		else
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		cin.clear(); //Restart error flag
	}

}
//plusplus
void qns5()
	{
	srand (time(NULL));
	double qn1 = rand() %200 + 1;
	double qn2 = rand() % 100 + 1;
	double QN3 = rand()%100+1;
	double input;
	double qnsans;
	cout<<"Here is your question!"<<endl;
	cout<< qn1 <<"-"<< qn2<<"+"<<QN3<<endl;
	qnsans= qn1-qn2+QN3;
	bool Restart=true;
	while(Restart==true)
	{
		cout<<"Enter your answer : ";
		cin>>input;
		Restart = cin.fail();
		if(cin.fail()==true)
			cout<<"\nError, Invalid Choice, Please Key in a Numerical Value\n";
		else if(qnsans==input)// if no error is present
		{
			cout<<"You Won the round!"<<endl;
			Restart = false; // to allow do loop to end
			system("Pause");
		}
		else if(qnsans!=input)
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		else
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		cin.clear(); //Restart error flag
	}

}
//minusplus
void qns6()
	{
	srand (time(NULL));
	double qn1 = rand() % 200 + 1;
	double qn2 = rand() % 20 + 1;
	double QN3 = rand() % 10+1;
	double input;
	double qnsans;
	cout<<"Here is your question!"<<endl;
	cout<< qn1 <<"+"<< qn2<<"*"<<QN3<<endl;
	qnsans= qn1+(qn2*QN3);
	bool Restart=true;
	while(Restart==true)
	{
		cout<<"Enter your answer : ";
		cin>>input;
		Restart = cin.fail();
		if(cin.fail()==true)
			cout<<"\nError, Invalid Choice, Please Key in a Numerical Value\n";
		else if(qnsans==input)// if no error is present
		{
			cout<<"You Won the round!"<<endl;
			Restart = false; // to allow do loop to end
			system("Pause");
		}
		else if(qnsans!=input)
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		else
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		cin.clear(); //Restart error flag
	}

}
//plus times
void qns7()
	{
	srand (time(NULL));
	double qn1 = rand() % 200 + 1;
	double qn2 = rand() % 20 + 1;
	double QN3 = rand() % 10+1;
	double input;
	double qnsans;
	cout<<"Here is your question!"<<endl;
	cout<< qn1 <<"-"<< qn2<<"*"<<QN3<<endl;
	qnsans= qn1-(qn2*QN3);
	bool Restart=true;
	while(Restart==true)
	{
		cout<<"Enter your answer : ";
		cin>>input;
		Restart = cin.fail();
		if(cin.fail()==true)
			cout<<"\nError, Invalid Choice, Please Key in a Numerical Value\n";
		else if(qnsans==input)// if no error is present
		{
			cout<<"You Won the round!"<<endl;
			Restart = false; // to allow do loop to end
			system("Pause");
		}
		else if(qnsans!=input)
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		else
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		cin.clear(); //Restart error flag
	}

}
//minus times
void qns8()
	{
	srand (time(NULL));
	double qn1 = rand() % 200 + 1;
	double qn2 = rand() % 30 + 1;
	double QN3 = rand() % 10+1;
	double QN4 = rand() % 10+1;
	double input;
	double qnsans;
	cout<<"Here is your question!"<<endl;
	cout<< qn1 <<"+"<< qn2<<"*"<<QN3<<"-"<<QN4<<endl;
	qnsans= qn1+qn2*QN3-QN4;
	bool Restart=true;
	while(Restart==true)
	{
		cout<<"Enter your answer : ";
		cin>>input;
		Restart = cin.fail();
		if(cin.fail()==true)
			cout<<"\nError, Invalid Choice, Please Key in a Numerical Value\n";
		else if(qnsans==input)// if no error is present
		{
			cout<<"You Won the round!"<<endl;
			Restart = false; // to allow do loop to end
			system("Pause");
		}
		else if(qnsans!=input)
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		else
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		cin.clear(); //Restart error flag
	}

}
//plus times minus
void qns9()
	{
	srand (time(NULL));
	double qn1 = rand() % 50 + 1;
	double qn2 = rand() % 20 + 1;
	double QN3 = rand() % 10+1;
	double QN4 = rand() % 10+1;
	double input;
	double qnsans;
	cout<<"Here is your question!"<<endl;
	cout<< qn1 <<"+"<< qn2<<"*"<<QN3<<"*"<<QN4<<endl;
	qnsans= qn1+qn2*QN3*QN4;
	bool Restart=true;
	while(Restart==true)
	{
		cout<<"Enter your answer : ";
		cin>>input;
		Restart = cin.fail();
		if(cin.fail()==true)
			cout<<"\nError, Invalid Choice, Please Key in a Numerical Value\n";
		else if(qnsans==input)// if no error is present
		{
			cout<<"You Won the round!"<<endl;
			Restart = false; // to allow do loop to end
			system("Pause");
		}
		else if(qnsans!=input)
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		else
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		cin.clear(); //Restart error flag
	}

}
//plus timestimes
void qns10()
	{
	srand (time(NULL));
	double qn1 = rand() % 200 + 1;
	double qn2 = rand() % 20 + 1;
	double QN3 = rand() % 10+1;
	double QN4 = rand() % 20+1;
	double QN5 = rand() % 20+1;
	double input;
	double qnsans;
	cout<<"Here is your question!"<<endl;
	cout<< "("<<qn1 <<"-"<< qn2<<")"<<"*"<<QN3<<"*"<<QN4<<"+"<<QN5<<endl;
	qnsans= (qn1-qn2)*QN3*QN4+QN5;
	bool Restart=true;
	while(Restart==true)
	{
		cout<<"Enter your answer : ";
		cin>>input;
		Restart = cin.fail();
		if(cin.fail()==true)
			cout<<"\nError, Invalid Choice, Please Key in a Numerical Value\n";
		else if(qnsans==input)// if no error is present
		{
			cout<<"You Won the round!"<<endl;
			Restart = false; // to allow do loop to end
			system("Pause");
		}
		else if(qnsans!=input)
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		else
		{
			cout<<"try again"<<endl;
			Restart = true;
		}
		cin.clear(); //Restart error flag
	}

}
//(minus times) times plus