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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 {
static constexpr int CHANNEL_ALL = -1;
/**
* \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 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(const EventHandler<EventType> & callback, int channel = CHANNEL_ALL, int priority = 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 = CHANNEL_ALL);
/**
* \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 = CHANNEL_ALL);
/**
* \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(const EventType & event, int channel = CHANNEL_ALL,int priority = 0);
/**
* \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();
/**
* \brief clears all subscribers
*
*/
void clear();
private:
/**
* \brief Default constructor for the EventManager.
*
* This constructor is private to enforce the singleton pattern.
*/
EventManager() = default;
struct QueueEntry {
std::unique_ptr<Event> event;
int channel = CHANNEL_ALL;
std::type_index type;
int priority = 0;
};
struct CallbackEntry {
std::unique_ptr<IEventHandlerWrapper> callback;
int channel = CHANNEL_ALL;
int priority = 0;
};
//! The queue of events to be processed.
std::vector<QueueEntry> events_queue;
//! Registered event handlers.
std::unordered_map<std::type_index,std::vector<CallbackEntry>> subscribers;
};
} // namespace crepe
#include "EventManager.hpp"
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