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#include < iostream >

using namespace std;

class Gastank{
private:
int lowFuelLevel;
int currentFuelLevel;
int MAX_FUEL_LEVEL;

public:
Gastank(){ // Default Constructor
MAX_FUEL_LEVEL = 20;
currentFuelLevel = 0;
lowFuelLevel = (MAX_FUEL_LEVEL / 4);
}

Gastank(int userVal){ // Alt Constructor
MAX_FUEL_LEVEL = userVal;
currentFuelLevel = 0;
lowFuelLevel = (MAX_FUEL_LEVEL / 4);
}

int fillTank(int gasUp){ // Put gas in the tank, tell us how much was ACTUALLY put in the tank
if (gasUp + currentFuelLevel > MAX_FUEL_LEVEL){
int fuelMissing = MAX_FUEL_LEVEL - currentFuelLevel;
currentFuelLevel = MAX_FUEL_LEVEL;
return fuelMissing;
}
else if (currentFuelLevel == MAX_FUEL_LEVEL){ // Tank is already full
return 0;
}
else{
currentFuelLevel += gasUp; // Put gas in the tank
return gasUp;
}
}

int getTankCapacity(){
return MAX_FUEL_LEVEL;
}

int getFuelLevel(){ // Return the gas level in the tank
return currentFuelLevel;
}

int used(int gasOut){ // Take gas out of the tank
if (currentFuelLevel - gasOut <= 0){
currentFuelLevel = 0;
return 0;
}
else{
currentFuelLevel -= gasOut;
}
}

bool isFuelLow(){ // Toggle the low-fuel light
if (currentFuelLevel <= lowFuelLevel)
return true;
else
return false;
}

};

void main()
{
int gallonsUsed;
int gallonsIn;
int menuOp;
Gastank tank1; // Object to point to class function
tank1.fillTank(3);
Gastank tank2(5);
tank2.fillTank(5);

cout << "Fuel Tanks: " << endl;
cout << "Fuel Tank 1: " << tank1.getFuelLevel() << " / " << tank1.getTankCapacity();
if (tank1.isFuelLow()){
cout << " Warning: Fuel Low";
}
cout << endl;
cout << "Fuel Tank 2: " << tank2.getFuelLevel() << " / " << tank2.getTankCapacity() << endl;
cout << endl;
cout << "Menu Selections" << endl;
cout << "1) Query Tanks" << endl;
cout << "2) Fill Tanks" << endl;
cout << "3) Use Tanks" << endl;
cout << "Choose Menu Option (Integers Only): ";
cin >> menuOp;

switch (menuOp){
case 1:{
cout << "1) Query Tanks" << endl;
cout << "Current fuel level for Tank 1 is: " << tank1.getFuelLevel() << endl;
cout << "Current fuel level for Tank 2 is: " << tank2.getFuelLevel() << endl;
break;
}
case 2:{
cout << "2) Fill Tanks" << endl;
cout << "Please enter the gallons to fill :";
cin >> gallonsIn;
cout << "Gallons filled Tank 1 ->" << tank1.fillTank(gallonsIn) << endl;
cout << "Gallons filled Tank 2 ->" << tank2.fillTank(gallonsIn) << endl;
break;
}
case 3:{

cout << "3) Use Tanks" << endl;
tank1.used(gallonsUsed);
tank2.used(gallonsUsed);
cout << "Gallons out Tank 1 ->" << tank1.used(gallonsUsed) << endl;
cout << "Gallons out Tank 2 ->" << tank2.used(gallonsUsed) << ". Tank level is now " << tank2.getFuelLevel() << endl;
break;
}
system("pause" ;
}