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//Nazim Ege Erdemir 26811
#include <iostream>
#include <string>
#include "strutils.h"
using namespace std;

bool syntaxgod(string q){

	string eq_left= q.substr(0,q.find("=")-1); //left side of equation
	string eq_right= q.substr(q.find("=")+1,-1);// right side of equation

	if (q.find("=") != string::npos)
	{
		if (q.find("=")==q.rfind("="))
		{
			if (eq_left.find("+"))
			{ //+ var mı yok mu kontrol ediyor
				string l_f=eq_left.substr(1);
				//int f_num = atoi(l_f);
				if (isdigit(eq_left))
				{
					if(eq_right.isdigit() ==true)
					{
						return true;
					}																									//BURDA KALDIN
				}
			}
			else if (eq_left.find("-",1)){ //1. indexten aramaya başlar
				string l_f=eq_left.substr(1);
				//int f_num = atoi(l_f);
				if (eq_left.isdigit()==true){
					if(eq_right.isdigit() ==true)
						return true;
					}																									//BURDA 
				}				
				return false;

			
			}

		return false;
	
	
		
	}
	
	return false;

	}

}

bool calcgod(string q,int & correct_a){

	
	string eq_left= q.substr(0,q.find("=")-1); //left side of equation
	eq_left.substr(0,2); // ilk sayı
	eq_left.substr(2,3); //ikinci sayı
	string eq_right= q.substr(q.find("=")+1,-1);  // right side of equation
																//atoi things, output should be correct_a.
	int lef = atoi (eq_left);
	if(lef){
	
		

		return true;
	}
	return false;
}


int pointgod(string q,int & joker){ //takes questions one by one and after checking each one it prints out the point user gained

	int t_point, correct_a;
	string answer;
	if (syntaxgod(q)){ //syntax check
		if(calcgod(q,correct_a)){  // calculation check

			cout<<"Correct answer! You got 25 points for this math expression."<<endl;
		
			t_point += 25;
			
		}else { //syntax correct but calculation not message, write again thing. (jokers)
			if (joker == 1){
				cout<<"Wrong!\nWould you like to use your joker option to correct the answer?"<<endl;
				cin>>answer;
				string low_answer = LowerString(answer);
				if (low_answer == "yes"){
					joker = 0;
					cout<<"Please enter the expression again: "<<endl;
					cin>>q;
					if (syntaxgod(q)){
						if(calcgod(q,correct_a)){
							cout<<"Correct answer! You got 25 points for this joker option."<<endl;
							t_point+= 25;
						}else{
					
							cout<<"Sorry! The answer should have been: "<<correct_a<<". You got -10 penalty points for this joker option."<<endl;
						}
				
					}else{//lose -10

						cout<<"Wrong input format! You got -10 penalty points for this joker option."<<endl;
						t_point -= 10;
					}
				}else{
			
					cout<<"Sorry! The answer should have been: "<<correct_a<<". You got 0 points for this math expression."<<endl;
			
				}
			
			
			
			}else{
			
				cout<<"Sorry! The answer should have been: "<<correct_a<<". You got 0 points for this math expression."<<endl;

			}
			
		
		}

	}else{		//syntax not correct -10 Point , go q2

		cout<<"Wrong input format! You got -10 penalty points for this math expression."<<endl;
		t_point = t_point - 10;


	return t_point,joker;
	}
}







int main(){

	string q1,q2,q3,q4;
	int t_point=0,joker=1;


	cout<<"Please enter question #1 and its answer: ";
	cin >> q1;
	pointgod(q1,joker);
	cout<<"Please enter question #2 and its answer: ";
	cin >> q2;
	pointgod(q2,joker);
	cout<<"Please enter question #3 and its answer: ";
	cin >> q3;
	pointgod(q3,joker);
	cout<<"Please enter question #4 and its answer: ";
	cin >> q4;
	pointgod(q4,joker);


	cout<<"End of the program. You got "<<t_point<<" points in total."<<endl;

	return 0;
}