node.h

#pragma once
#include "date.h"
#include <memory>

using namespace std;

enum Comparison
{
    Greater,
    GreaterOrEqual,
    Less,
    LessOrEqual,
    Equal,
    NotEqual
};

enum LogicalOperation
{
    Or,
    And
};

class Node
{
public:
    virtual bool Evaluate(const Date& _Date, const string& _Event) const = 0;
};

class EmptyNode : public Node
{
public:
    bool Evaluate(const Date& _Date, const string& _Event) const override;
};

class DateComparisonNode : public Node
{
public:
    DateComparisonNode(const Comparison _Cmp, const Date& _Date);

    bool Evaluate(const Date& _Date, const string& _Event) const override;

private:
    const Comparison _Cmp;
    const Date _Date;
};

class EventComparisonNode : public Node
{
public:
    EventComparisonNode(const Comparison& _Cmp, const string& _Event);

    bool Evaluate(const Date& _Date, const string& _Event) const override;

private:
    const Comparison _Cmp;
    const string _Event;
};

class LogicalOperationNode : public Node
{
public:
    LogicalOperationNode(const LogicalOperation& _Operation, const shared_ptr<Node>& _Left, const shared_ptr<Node>& _Right);

    bool Evaluate(const Date& _Date, const string& _Event) const override;

private:
    const LogicalOperation _Operation;
    const shared_ptr<Node> _Left, _Right;
};