cp_calendar_poller.hpp

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// Copyright 2024 RobosoftAI Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#pragma once
 
#include <chrono>
#include <functional>
#include <mutex>
#include <string>
#include <vector>
 
#include <rclcpp/rclcpp.hpp>
#include <smacc2/smacc.hpp>
 
#include <cl_gcalcli/components/cp_gcalcli_connection.hpp>
#include <cl_gcalcli/events.hpp>
#include <cl_gcalcli/types.hpp>
 
namespace cl_gcalcli
{
 
class CpCalendarPoller : public smacc2::ISmaccComponent, public smacc2::ISmaccUpdatable
{
public:
  CpCalendarPoller();
  virtual ~CpCalendarPoller() = default;
 
  void onInitialize() override;
 
  bool refreshAgenda();
 
  std::vector<CalendarEvent> getEvents() const;
 
  std::vector<CalendarEvent> findEvents(const std::string & pattern, bool use_regex = false) const;
 
  std::vector<CalendarEvent> getEventsInWindow(
    std::chrono::system_clock::time_point start, std::chrono::system_clock::time_point end) const;
 
  std::vector<CalendarEvent> getActiveEvents() const;
 
  std::chrono::system_clock::time_point getLastPollTime() const;
 
  // Signal for agenda updates
  smacc2::SmaccSignal<void(const std::vector<CalendarEvent> &)> onAgendaUpdated_;
 
  // Signal connection helper
  template <typename T>
  smacc2::SmaccSignalConnection onAgendaUpdated(
    void (T::*callback)(const std::vector<CalendarEvent> &), T * object)
  {
    return this->getStateMachine()->createSignalConnection(onAgendaUpdated_, callback, object);
  }
 
  // Event posting function - set via onStateOrthogonalAllocation
  std::function<void(const std::vector<CalendarEvent> &)> postAgendaUpdatedEvent_;
 
  template <typename TOrthogonal, typename TSourceObject>
  void onStateOrthogonalAllocation()
  {
    postAgendaUpdatedEvent_ = [this](const std::vector<CalendarEvent> & events)
    {
      auto ev = new EvAgendaUpdated<CpCalendarPoller, TOrthogonal>();
      ev->events = events;
      this->postEvent(ev);
    };
  }
 
protected:
  void update() override;
 
private:
  std::vector<CalendarEvent> parseTsvOutput(const std::string & output);
 
  std::optional<CalendarEvent> parseTsvLine(const std::string & line);
 
  std::optional<std::chrono::system_clock::time_point> parseDateTime(
    const std::string & date_str, const std::string & time_str);
 
  std::string generateEventId(const CalendarEvent & event);
 
  CpGcalcliConnection * connection_;
  std::vector<CalendarEvent> cached_events_;
  std::chrono::system_clock::time_point last_poll_time_;
  std::chrono::steady_clock::time_point last_poll_attempt_;
  bool initialized_;
 
  mutable std::mutex events_mutex_;
};
 
}  // namespace cl_gcalcli