// Program: house.cpp
// Author: ...

#include <iostream>
#include <vector>
#include <cmath>


/////////////////////////////////////////////////////////////////////////////
// CLASS DEFINITIONS
/////////////////////////////////////////////////////////////////////////////

class Shape {
public:
    Shape(bool p) : paintable(p) {}

    virtual ~Shape() {} // needed just for technical reasons

    // PRE:-
    // POST: Returns true if area is paintable.
    bool can_paint() const
    {
        return paintable;
    }

    // PRE: -
    // POST: Returns the area of the shape.
    virtual double get_area() const = 0;

private:
    bool paintable;
};

// TODO: IMPLEMENT TRIANGLE CLASS

// TODO: IMPLEMENT RECTANGLE CLASS

// TODO: IMPLEMENT CIRCLE CLASS

/////////////////////////////////////////////////////////////////////////////
// TEST MAIN FUNCTION (MODIFY WHERE STATED)
/////////////////////////////////////////////////////////////////////////////

//
int main() {
    std::vector<Shape*> shapes;

    // parse test data in the following format until end marker is found:
    // <shape> <add/remove> <parameter 1> <parameter 2>
    // where <parameter 2> is optional
    while(std::cin.good()) {
        std::string shape;
        std::cin >> shape;
        if (shape == "end")
            break;

        // parse + / -
        char sign;
        std::cin >> sign;
        bool is_paintable = sign == '+';

        if (shape == "triangle") {
            double width;
            std::cin >> width;
            double height;
            std::cin >> height;

            // TODO: IMPLEMENT, ADD PARAMETERS AND UNCOMMENT
            //shapes.push_back(new Triangle(...));

        } else if (shape == "rectangle") {
            double width;
            std::cin >> width;
            double height;
            std::cin >> height;

            // TODO: IMPLEMENT, ADD PARAMETERS AND UNCOMMENT
            //shapes.push_back(new Rectangle(...));

        } else if (shape == "circle") {
            double radius;
            std::cin >> radius;

            // TODO: IMPLEMENT, ADD PARAMETERS AND UNCOMMENT
            //shapes.push_back(new Circle(...));

        } else {
            std::cout << "unknown shape: " << shape << "\n";
            break;
        }
    }

    // calculate area to be painted
    double area = 0;
    for(std::vector<Shape*>::iterator it = shapes.begin(); it != shapes.end(); ++it) {
        const Shape* shape = *it;

        if (shape->can_paint()) {
            area += shape->get_area();
        } else {
            area -= shape->get_area();
        }
    }
    std::cout << "--- paintable area:\n" << area << "\n";

    // clean up allocated shape objects
    for(std::vector<Shape*>::iterator it = shapes.begin(); it != shapes.end(); ++it)
        delete *it;
    
    return 0;
}