/*
	GWEN
	Copyright (c) 2010 Facepunch Studios
	See license in Gwen.h
*/

#pragma once
#ifndef GWEN_ANIM_H
#define GWEN_ANIM_H
#include "Gwen/Gwen.h"
#include "Gwen/Controls/Base.h"
#include "Gwen/Platform.h"

#ifndef GWEN_NO_ANIMATION

namespace Gwen 
{
	namespace Anim
	{
		class GWEN_EXPORT Animation
		{
			public:

				typedef std::list<Animation*> ChildList;
				typedef std::map< Gwen::Controls::Base *, ChildList > List;

				virtual void Think() = 0;
				virtual bool Finished() = 0;

				virtual ~Animation() {}

				Gwen::Controls::Base*	m_Control;
		};

		GWEN_EXPORT void Add( Gwen::Controls::Base* control, Animation* animation );
		GWEN_EXPORT void Cancel( Gwen::Controls::Base* control );
		GWEN_EXPORT void Think();

		//
		// Timed animation. Provides a useful base for animations.
		//
		class GWEN_EXPORT TimedAnimation : public Animation
		{
			public:

				TimedAnimation( float fLength, float fDelay = 0.0f, float fEase = 1.0f );

				virtual void Think();
				virtual bool Finished();

				//
				// These are the magic functions you should be overriding
				// 
				virtual void OnStart(){}
				virtual void Run( float /*delta*/ ){}
				virtual void OnFinish(){}

			protected:

				bool	m_bStarted;
				bool	m_bFinished;
				float	m_fStart;
				float	m_fEnd;
				float	m_fEase;
		};

		namespace Size
		{
			class GWEN_EXPORT Height : public TimedAnimation
			{
				public:

					Height( int iStartSize, int iEndSize, float fLength, bool bHide = false, float fDelay = 0.0f, float fEase = 1.0f ) : TimedAnimation( fLength, fDelay, fEase )
					{
						m_iStartSize = iStartSize;
						m_iDelta = iEndSize - m_iStartSize;
						m_bHide = bHide;
					}

					virtual void OnStart(){ m_Control->SetHeight( m_iStartSize ); }
					virtual void Run( float delta ){ m_Control->SetHeight( m_iStartSize + (((float)m_iDelta) * delta) ); }
					virtual void OnFinish(){ m_Control->SetHeight( m_iStartSize + m_iDelta ); m_Control->SetHidden( m_bHide ); }

				protected:

					int		m_iStartSize;
					int		m_iDelta;
					bool	m_bHide;
			};

			class Width : public TimedAnimation
			{
				public:

					Width( int iStartSize, int iEndSize, float fLength, bool bHide = false, float fDelay = 0.0f, float fEase = 1.0f ) : TimedAnimation( fLength, fDelay, fEase )
					{
						m_iStartSize = iStartSize;
						m_iDelta = iEndSize - m_iStartSize;
						m_bHide = bHide;
					}

					virtual void OnStart(){ m_Control->SetWidth( m_iStartSize ); }
					virtual void Run( float delta ){ m_Control->SetWidth( m_iStartSize + (((float)m_iDelta) * delta) ); }
					virtual void OnFinish(){ m_Control->SetWidth( m_iStartSize + m_iDelta ); m_Control->SetHidden( m_bHide ); }

				protected:

					int		m_iStartSize;
					int		m_iDelta;
					bool	m_bHide;
			};
		}

		namespace Tools
		{
			class Remove : public TimedAnimation
			{
				public:

					Remove( float fDelay = 0.0f ) : TimedAnimation( 0.0f, fDelay ){}
					virtual void OnFinish(){ m_Control->DelayedDelete(); }
			};
		}


	}
}

#endif
#endif