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#pragma once
#include <functional>
#include <memory>
#include <type_traits>
#include <typeindex>
#include <unordered_map>
#include <vector>
#include "Event.h"
#include "EventHandler.h"
namespace crepe {
/**
* \class EventManager
* \brief The EventManager class is responsible for managing the subscription, triggering,
* and queueing of events. It handles events and dispatches them to appropriate subscribers.
*/
class EventManager {
public:
/**
* \brief Deleted copy constructor to prevent copying of the EventManager instance.
*/
EventManager(const EventManager &) = delete;
/**
* \brief Deleted copy assignment operator to prevent assignment of the EventManager instance.
*/
const EventManager & operator=(const EventManager &) = delete;
/**
* \brief Get the singleton instance of the EventManager.
*
* This method returns the unique instance of the EventManager, creating it on the first call.
*
* \return Reference to the EventManager instance.
*/
static EventManager & get_instance();
/**
* \brief Subscribe to an event.
*
* This method allows the registration of a callback for a specific event type and channel.
*
* \tparam EventType The type of the event to subscribe to.
* \param callback The callback function to invoke when the event is triggered.
* \param channel The channel number to subscribe to (default is 0).
*/
template <typename EventType>
void subscribe(EventHandler<EventType> && callback, int channel = 0);
/**
* \brief Unsubscribe from an event.
*
* This method removes a previously registered callback from an event.
*
* \tparam EventType The type of the event to unsubscribe from.
* \param callback The callback function to remove from the subscription list.
* \param channel The event ID to unsubscribe from.
*/
template <typename EventType>
void unsubscribe(const EventHandler<EventType> &, int channel);
/**
* \brief Trigger an event.
*
* This method invokes the appropriate callback(s) for the specified event.
*
* \tparam EventType The type of the event to trigger.
* \param event The event data to pass to the callback.
* \param channel The channel from which to trigger the event (default is 0).
*/
template <typename EventType>
void trigger_event(const EventType & event, int channel);
/**
* \brief Queue an event for later processing.
*
* This method adds an event to the event queue, which will be processed in the
* dispatch_events function.
*
* \tparam EventType The type of the event to queue.
* \param event The event to queue.
* \param channel The channel number for the event (default is 0).
*/
template <typename EventType>
void queue_event(EventType && event, int channel);
/**
* \brief Dispatch all queued events.
*
* This method processes all events in the event queue and triggers the corresponding
* callbacks for each event.
*/
void dispatch_events();
private:
/**
* \brief Default constructor for the EventManager.
*
* This constructor is private to enforce the singleton pattern.
*/
EventManager() = default;
//! The queue of events to be processed.
std::vector<std::tuple<std::unique_ptr<Event>, int, std::type_index>>
events_queue;
//! Registered event handlers.
std::unordered_map<std::type_index,
std::vector<std::unique_ptr<IEventHandlerWrapper>>>
subscribers;
//! Event handlers indexed by event ID.
std::unordered_map<
std::type_index,
std::unordered_map<int,
std::vector<std::unique_ptr<IEventHandlerWrapper>>>>
subscribers_by_event_id;
};
} // namespace crepe
#include "EventManager.hpp"
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