/*
 * ValueMath.hpp
 *
 *  Created on: 25 окт. 2021 г.
 *      Author: titov
 */

#ifndef UMLIBRARY_SCHEMATIC_VALUEMATH_HPP_
#define UMLIBRARY_SCHEMATIC_VALUEMATH_HPP_

#include "../systemic/IValueAsync.hpp"

#include <cmath>
#include <functional>

namespace schematic {

class EquationBase2 {
public:
    typedef float ValueType;
    typedef systemic::IValueType<ValueType> ValueInterface;

    struct Setting {
        ValueType left;     //!<Левая часть выражения.
        ValueType right;    //!<Правая часть выражения.

        bool isValid();
    };

    bool configure( Setting & config );

    ValueInterface & left();    //!<Левая часть выражения.
    ValueInterface & right();   //!<Правая часть выражения.

protected:
    virtual void update() = 0;

    struct EquationPart: public ValueInterface {
        float value;

        EquationBase2 & equation;

        void set( ValueType new_value );
        ValueType get() const;

        EquationPart( EquationBase2 & equation );
    } a, b;

    EquationBase2();
};

template<typename Functor>
class Equation : public EquationBase2 {
public:
    Equation( ValueInterface & result, Functor functor = Functor() ) :
        result(result), functor(functor) {}

private:
    ValueInterface & result;
    Functor functor;

    void update() {
        result.set( functor( a.value, b.value ) );
    }
};

typedef Equation< std::minus<float> > EquationSubtraction;
typedef Equation< std::plus<float> > EquationAddition;
typedef Equation< std::multiplies<float> > EquationMultiplication;
typedef Equation< std::divides<float> > EquationDivision;
typedef Equation< std::pointer_to_binary_function<float, float, float> > EquationCustom;

}


#endif /* UMLIBRARY_SCHEMATIC_VALUEMATH_HPP_ */