text: #pragma once
  
  #include "hzpch.h"
  #include "Hazel/Core.h"
  
  namespace Hazel
  {
  	// Events in Hazel are currently blocking, meaning when an event occurs it
  	// immediately gets dispatched and must be dealt with ruight then and there.
  	// For the future, a better strategy might be to buffer events in an event
  	// bus and process them during the "event" part of the update stage.
  
  	enum class EventType
  	{
  		None = 0,
  		WindowClose, WindowResize, WindowFocus, WindowLostFocus, WindowMoved,
  		AppTick, AppUpdate, AppRender,
  		KeyPressed, KeyReleased,
  		MouseButtonPressed, MouseButtonReleased, MouseMoved, MouseScrolled
  	};
  
  	enum EventCatagory
  	{
  		None = 0,
  		EventCategoryApplication	= BIT(0),
  		EventCategoryInput			= BIT(1),
  		EventCategoryKeyboard		= BIT(2),
  		EventCategoryMouse			= BIT(3),
  		EventCategoryMouseButton	= BIT(4)
  	};
  
  #define EVENT_CLASS_TYPE(type) static EventType GetStaticType() { return EventType::##type; }\
  								virtual EventType GetEventType() const override { return GetStaticType(); }\
  								virtual const char* GetName() const override { return #type; }
  
  #define EVENT_CLASS_CATEGORY(category) virtual int GetCategoryFlags() const override { return category; }
  
  	class HAZEL_API Event
  	{
  	private:
  		friend class EventDispatcher;
  
  	public:
  		virtual EventType GetEventType() const = 0;
  		virtual const char* GetName() const = 0;
  		virtual int GetCategoryFlags() const = 0;
  		virtual std::string ToString() const { return GetName(); }
  		virtual bool Handled() const { return m_Handled; }
  
  		inline bool IsInCategory(EventCatagory category)
  		{
  			return GetCategoryFlags() & category;
  		}
  
  	protected:
  		bool m_Handled = false;
  	};
  
  	class EventDispatcher
  	{
  	private:
  		template<typename T>
  		using EventFn = std::function<bool(T&)>;
  
  	public:
  		EventDispatcher(Event& event)
  			: m_Event(event)
  		{
  		}
  
  		template<typename T>
  		bool Dispatch(EventFn<T> func)
  		{
  			if (m_Event.GetEventType() == T::GetStaticType())
  			{
  				m_Event.m_Handled = func(*(T*)&m_Event);
  				return true;
  			}
  			return false;
  		}
  
  	private:
  		Event& m_Event;
  	};
  
  	inline std::ostream& operator<<(std::ostream& os, const Event& e)
  	{
  		return os << e.ToString();
  	}
  }