#ifndef ENVIRONMENT_HH
#define ENVIRONMENT_HH

#include "../tokenizer.hh"
#include <memory>
#include <string>
#include <unordered_map>

struct Environment {
  Environment() : enclosing{nullptr}, values{} {}
  Environment(std::shared_ptr<Environment> enclosing) : enclosing{enclosing}, values{} {}
  Environment(const Environment &other);
  Environment(Environment &&other) noexcept;

  Environment &operator=(const Environment &other);
  Environment &operator=(Environment &&other) noexcept;

  ~Environment() = default;

  void define(const std::string &name, const Object &value);
  void assign(const Token &name, const Object &value);
  Object get(const Token &name);
private:
  std::shared_ptr<Environment> enclosing;
  std::unordered_map<std::string, Object> values;
};

#endif