state.hpp

/*
 Copyright (c) 2025 ETIB Corporation
 
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 this software and associated documentation files (the "Software"), to deal in
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 use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 of the Software, and to permit persons to whom the Software is furnished to do
 so, subject to the following conditions:
 
 The above copyright notice and this permission notice shall be included in all
 copies or substantial portions of the Software.
 
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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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 */
 
#pragma once
 
#include <any>
#include <functional>
#include <map>
#include <string>
 
class State {
private:
  std::map<std::string, std::any> _data;
  std::function<void()> _onStateChange;
 
public:
  State(void) : _data(), _onStateChange(nullptr) {}
  ~State(void) = default;
 
  void setState(const std::map<std::string, std::any> &newState) {
    for (const auto &[key, value] : newState) {
      _data[key] = value;
    }
    if (_onStateChange) {
      _onStateChange();
    }
  }
 
  template <typename T> T get(const std::string &key) const {
    auto it = _data.find(key);
    if (it != _data.end()) {
      return std::any_cast<T>(it->second);
    }
    return T();
  }
 
  template <typename T> void set(const std::string &key, const T &value) {
    _data[key] = value;
    if (_onStateChange) {
      _onStateChange();
    }
  }
 
  void setOnStateChange(std::function<void()> callback) {
    _onStateChange = callback;
  }
 
  const std::map<std::string, std::any> &getData(void) const { return _data; }
};