/****************************************************************************
Copyright (c) 2011-2013,WebJet Business Division,CYOU
 
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****************************************************************************/
#ifndef __inputtouchscreenbase_H__
#define __inputtouchscreenbase_H__

#include "input/inputhandler.h"
#include "util/fixedarray.h"
#include "input/inputeventtypes.h"
namespace Input
{
	class InputTouchScreenBase : public Input::InputHandler
{
	__DeclareClass(InputTouchScreenBase);

public:

	/// constructor
	InputTouchScreenBase();
	/// destructor
	virtual ~InputTouchScreenBase();

	/// return true if nth Finger is currently pressed
	bool FingerPressing(const IndexT nPointer = 0) const;
	/// return true if nth Finger was down at least once in current frame 
	bool FingerDown(const IndexT nPointer = 0) const;
	/// return true if nth Finger was up at least once in current frame 
	bool FingerUp(const IndexT nPointer = 0) const;
	/// get current absolute nth Finger position (in pixels)
	const Math::float2& GetPixelPosition(const IndexT nPointer = 0) const;
	/// get current screen space nth Finger position (0.0 .. 1.0)
	const Math::float2& GetScreenPosition(const IndexT nPointer = 0) const;
	/// get nth Finger movement
	const Math::float2& GetMovement(const IndexT nPointer = 0) const;

	int GetTouchCount();

	int GetTouchID(int index);

	int GetCurrentEventCount() const;

	TouchEvent GetCurrentEvent(int index) const;

protected:

	/// called when the handler is attached to the input server
	virtual void OnAttach(const GPtr<InputServerBase>& inputServer);
	/// called on InputServer::BeginFrame()
	virtual void OnBeginFrame();
	/// called when an input event should be processed
	virtual bool OnEvent(const Input::InputEvent& inputEvent);
	/// reset the input handler
	virtual void OnReset();

private:

	/// update finger position members
	void UpdateFingerPositions(const Math::float2& pixelPos, const Math::float2& screenPos, const IndexT nPointer = 0);

	void PointerIdHelper(const IndexT& id, const Math::float2& pixelPos, const Math::float2& screenPos);

	struct FingerState
	{
	public:
		/// constructor
		FingerState() : pressed(false), down(false), up(false)
		{

		};

		bool pressed;
		bool down;
		bool up;

	};

	Util::Dictionary<IndexT, Math::float2 >  m_PixelPositions;
	Util::Dictionary<IndexT, Math::float2 >  m_ScreenPositions;
	Util::Dictionary<IndexT, Math::float2 >  m_Movements;

	bool                              m_bInitialMovement;
    
protected:
    Util::Dictionary<IndexT, FingerState>     m_FingerStates;
	Util::Array<TouchEvent>		m_CurrentEvents;

};

inline bool InputTouchScreenBase::FingerPressing(const IndexT nPointer /* = 0 */) const
{
	return m_FingerStates[nPointer].pressed;
}

inline bool InputTouchScreenBase::FingerDown(const IndexT nPointer /* = 0 */) const
{
	return m_FingerStates[nPointer].down;
}

inline bool InputTouchScreenBase::FingerUp(const IndexT nPointer /* = 0 */) const
{
	return m_FingerStates[nPointer].up;
}

inline const Math::float2& InputTouchScreenBase::GetPixelPosition(const IndexT nPointer /* = 0 */) const
{
	return m_PixelPositions[nPointer];
}

inline const Math::float2& InputTouchScreenBase::GetScreenPosition(const IndexT nPointer /* = 0 */) const
{
	return m_ScreenPositions[nPointer];
}

inline const Math::float2& InputTouchScreenBase::GetMovement(const IndexT nPointer /* = 0 */) const
{
	return m_Movements[nPointer];
}

inline int InputTouchScreenBase::GetTouchCount()
{
	return m_ScreenPositions.Size();
}

inline int InputTouchScreenBase::GetTouchID( int index )
{
	return m_ScreenPositions.KeyAtIndex(index);
}

inline int InputTouchScreenBase::GetCurrentEventCount() const
{
	return m_CurrentEvents.Size();
}

inline TouchEvent InputTouchScreenBase::GetCurrentEvent(int index) const
{
	return m_CurrentEvents[index];
}
}

#endif