1 files changed, 112 insertions, 0 deletions
diff --git a/src/crepe/api/EventManager.h b/src/crepe/api/EventManager.h
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+++ b/src/crepe/api/EventManager.h
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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 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"