#include "global.h"
#include "InputFilter.h"
#include "RageLog.h"
#include "RageInput.h"
#include "RageUtil.h"
#include "RageThreads.h"
#include "Preference.h"
#include "Foreach.h"
// for mouse stuff: -aj
#include "PrefsManager.h"
#include "ScreenDimensions.h"

#include <set>
struct ButtonState
{
	ButtonState();
	bool m_BeingHeld; // actual current state
	bool m_bLastReportedHeld; // last state reported by Update()
	RString m_sComment;
	float m_fSecsHeld;
	DeviceInput m_DeviceInput;

	// Timestamp of m_BeingHeld changing.
	RageTimer m_BeingHeldTime;

	// The time that we actually reported the last event (used for debouncing).
	RageTimer m_LastReportTime;

	// The timestamp of the last reported change. Unlike m_BeingHeldTime, this
	// value is debounced along with the input state. (This is the same as
	// m_fSecsHeld, except this isn't affected by Update scaling.)
	RageTimer m_LastInputTime;
};

struct DeviceButtonPair
{
	InputDevice device;
	DeviceButton button;
	DeviceButtonPair( InputDevice d, DeviceButton b ): device(d), button(b){ }
	bool operator<( const DeviceButtonPair &other ) const
	{ 
		if( device != other.device )
			return device < other.device;
		return button < other.button;
	}
};

namespace
{
	/* Maintain a set of all interesting buttons: buttons which are being held
	 * down, or which were held down and need a RELEASE event. We use this to
	 * optimize InputFilter::Update, so we don't have to process every button
	 * we know about when most of them aren't in use. This set is protected
	 * by queuemutex. */
	typedef map<DeviceButtonPair, ButtonState> ButtonStateMap;
	ButtonStateMap g_ButtonStates;
	ButtonState &GetButtonState( const DeviceInput &di )
	{
		DeviceButtonPair db(di.device, di.button);
		ButtonState &bs = g_ButtonStates[db];
		bs.m_DeviceInput.button = di.button;
		bs.m_DeviceInput.device = di.device;
		return bs;
	}

	DeviceInputList g_CurrentState;
	set<DeviceInput> g_DisableRepeat;
}

/* Some input devices require debouncing. Do this on both press and release.
 * After reporting a change in state, don't report another for the debounce
 * period. If a button is reported pressed, report it. If the button is
 * immediately reported released, wait a period before reporting it; if the
 * button is repressed during that time, the release is never reported.
 * The detail is important: if a button is pressed for 1ms and released, we must
 * always report it, even if the debounce period is 10ms, since it might be a
 * coin counter with a very short signal. The only time we discard events is if
 * a button is pressed, released and then pressed again quickly.
 *
 * This delay in events is ordinarily not noticable, because we report initial
 * presses and releases immediately.  However, if a real press is ever delayed,
 * this won't cause timing problems, because the event timestamp is preserved. */
static Preference<float> g_fInputDebounceTime( "InputDebounceTime", 0 );

InputFilter*	INPUTFILTER = NULL;	// global and accessable from anywhere in our program

static const float TIME_BEFORE_REPEATS = 0.375f;

static const float REPEATS_PER_SEC = 8;

static float g_fTimeBeforeRepeats, g_fTimeBetweenRepeats;


InputFilter::InputFilter()
{
	queuemutex = new RageMutex("InputFilter");

	Reset();
	ResetRepeatRate();

	m_MouseCoords.fX = 0;
	m_MouseCoords.fY = 0;
	m_MouseCoords.fZ = 0;

	// Register with Lua.
	{
		Lua *L = LUA->Get();
		lua_pushstring( L, "INPUTFILTER" );
		this->PushSelf( L );
		lua_settable( L, LUA_GLOBALSINDEX );
		LUA->Release( L );
	}
}

InputFilter::~InputFilter()
{
	delete queuemutex;
	g_ButtonStates.clear();
	// Unregister with Lua.
	LUA->UnsetGlobal( "INPUTFILTER" );
}

void InputFilter::Reset()
{
	FOREACH_InputDevice( i )
		ResetDevice( InputDevice(i) );
}

void InputFilter::SetRepeatRate( float fRepeatRate )
{
	g_fTimeBetweenRepeats = 1/fRepeatRate;
}

void InputFilter::SetRepeatDelay( float fDelay )
{
	g_fTimeBeforeRepeats = fDelay;
}

void InputFilter::ResetRepeatRate()
{
	SetRepeatRate( REPEATS_PER_SEC );
	SetRepeatDelay( TIME_BEFORE_REPEATS );
}

ButtonState::ButtonState():
	m_BeingHeldTime(RageZeroTimer),
	m_LastReportTime(RageZeroTimer)
{
	m_BeingHeld = false;
	m_bLastReportedHeld = false;
	m_fSecsHeld = 0;
}

void InputFilter::ButtonPressed( const DeviceInput &di )
{
	LockMut(*queuemutex);

	if( di.ts.IsZero() )
		LOG->Warn( "InputFilter::ButtonPressed: zero timestamp is invalid" );

	ASSERT_M( di.device < NUM_InputDevice, ssprintf("Invalid device %i", di.device) );
	ASSERT_M( di.button < NUM_DeviceButton, ssprintf("Invalid button %i", di.button) );

	ButtonState &bs = GetButtonState( di );

	// Flush any delayed input, like Update() (in case Update() isn't being called).
	RageTimer now;
	CheckButtonChange( bs, di, now );

	bs.m_DeviceInput = di;

	bool Down = di.bDown;
	if( bs.m_BeingHeld != Down )
	{
		bs.m_BeingHeld = Down;
		bs.m_BeingHeldTime = di.ts;
	}

	// Try to report presses immediately.
	MakeButtonStateList( g_CurrentState );
	CheckButtonChange( bs, di, now );
}

void InputFilter::SetButtonComment( const DeviceInput &di, const RString &sComment )
{
	LockMut(*queuemutex);
	ButtonState &bs = GetButtonState( di );
	bs.m_sComment = sComment;
}

/** @brief Release all buttons on the given device. */
void InputFilter::ResetDevice( InputDevice device )
{
	LockMut(*queuemutex);
	RageTimer now;

	const ButtonStateMap ButtonStates( g_ButtonStates );
	for (std::pair<DeviceButtonPair const, ButtonState> const &b : ButtonStates)
	{
		const DeviceButtonPair &db = b.first;
		if( db.device == device )
			ButtonPressed( DeviceInput(device, db.button, 0, now) );
	}
}

/** @brief Check for reportable presses. */
void InputFilter::CheckButtonChange( ButtonState &bs, DeviceInput di, const RageTimer &now )
{
	if( bs.m_BeingHeld == bs.m_bLastReportedHeld )
		return;

	/* If the last IET_FIRST_PRESS or IET_RELEASE event was sent too recently,
	 * wait a while before sending it. */
	if( now - bs.m_LastReportTime < g_fInputDebounceTime )
		return;

	bs.m_LastReportTime = now;
	bs.m_bLastReportedHeld = bs.m_BeingHeld;
	bs.m_fSecsHeld = 0;
	bs.m_LastInputTime = bs.m_BeingHeldTime;

	di.ts = bs.m_BeingHeldTime;
	if( !bs.m_bLastReportedHeld )
		di.level = 0;

	MakeButtonStateList( g_CurrentState );
	ReportButtonChange( di, bs.m_bLastReportedHeld? IET_FIRST_PRESS:IET_RELEASE );

	if( !bs.m_bLastReportedHeld )
		g_DisableRepeat.erase( di );
}

void InputFilter::ReportButtonChange( const DeviceInput &di, InputEventType t )
{
	queue.push_back( InputEvent() );
	InputEvent &ie = queue.back();
	ie.type = t;
	ie.di = di;

	/* Include a list of all buttons that were pressed at the time of this event.
	 * We can create this efficiently using g_ButtonStates. Use a vector and not
	 * a map, for efficiency; most code will not use this information. Iterating
	 * over g_ButtonStates will be in DeviceInput order, so users can binary
	 * search this list (eg. std::lower_bound). */
	ie.m_ButtonState = g_CurrentState;
}

void InputFilter::MakeButtonStateList( vector<DeviceInput> &aInputOut ) const
{
	aInputOut.clear();
	aInputOut.reserve( g_ButtonStates.size() );
	for( ButtonStateMap::const_iterator it = g_ButtonStates.begin(); it != g_ButtonStates.end(); ++it )
	{
		const ButtonState &bs = it->second;
		aInputOut.push_back( bs.m_DeviceInput );
		aInputOut.back().ts = bs.m_LastInputTime;
		aInputOut.back().bDown = bs.m_bLastReportedHeld;
	}
}

void InputFilter::Update( float fDeltaTime )
{
	RageTimer now;

	INPUTMAN->Update();

	/* Make sure that nothing gets inserted while we do this, to prevent things
	 * like "key pressed, key release, key repeat". */
	LockMut(*queuemutex);

	DeviceInput di( InputDevice_Invalid, DeviceButton_Invalid, 1.0f, now );

	MakeButtonStateList( g_CurrentState );

	vector<ButtonStateMap::iterator> ButtonsToErase;

	FOREACHM( DeviceButtonPair, ButtonState, g_ButtonStates, b )
	{
		di.device = b->first.device;
		di.button = b->first.button;
		ButtonState &bs = b->second;

		// Generate IET_FIRST_PRESS and IET_RELEASE events that were delayed.
		CheckButtonChange( bs, di, now );

		// Generate IET_REPEAT events.
		if( !bs.m_bLastReportedHeld )
		{
			// If the key isn't pressed, and hasn't been pressed for a while
			// (so debouncing isn't interested in it), purge the entry.
			if( now - bs.m_LastReportTime > g_fInputDebounceTime &&
				 bs.m_DeviceInput.level == 0.0f )
				ButtonsToErase.push_back( b );
			continue;
		}

		// If repeats are disabled for this button, skip.
		if( g_DisableRepeat.find(di) != g_DisableRepeat.end() )
			continue;

		const float fOldHoldTime = bs.m_fSecsHeld;
		bs.m_fSecsHeld += fDeltaTime;
		const float fNewHoldTime = bs.m_fSecsHeld;

		if( fNewHoldTime <= g_fTimeBeforeRepeats )
			continue;

		float fRepeatTime;
		if( fOldHoldTime < g_fTimeBeforeRepeats )
		{
			fRepeatTime = g_fTimeBeforeRepeats;
		}
		else
		{
			float fAdjustedOldHoldTime = fOldHoldTime - g_fTimeBeforeRepeats;
			float fAdjustedNewHoldTime = fNewHoldTime - g_fTimeBeforeRepeats;
			if( int(fAdjustedOldHoldTime/g_fTimeBetweenRepeats) == int(fAdjustedNewHoldTime/g_fTimeBetweenRepeats) )
				continue;
			fRepeatTime = ftruncf( fNewHoldTime, g_fTimeBetweenRepeats );
		}

		/* Set the timestamp to the exact time of the repeat. This way, as long
		 * as tab/` aren't being used, the timestamp will always increase steadily
		 * during repeats. */
		di.ts = bs.m_LastInputTime + fRepeatTime;

		ReportButtonChange( di, IET_REPEAT );
	}

	FOREACH( ButtonStateMap::iterator, ButtonsToErase, it )
		g_ButtonStates.erase( *it );
}

template<typename T, typename IT>
const T *FindItemBinarySearch( IT begin, IT end, const T &i )
{
	IT it = lower_bound( begin, end, i );
	if( it == end || *it != i )
		return NULL;

	return &*it;
}

bool InputFilter::IsBeingPressed( const DeviceInput &di, const DeviceInputList *pButtonState ) const
{
	LockMut(*queuemutex);
	if( pButtonState == NULL )
		pButtonState = &g_CurrentState;
	const DeviceInput *pDI = FindItemBinarySearch( pButtonState->begin(), pButtonState->end(), di );
	return pDI != NULL && pDI->bDown;
}

float InputFilter::GetSecsHeld( const DeviceInput &di, const DeviceInputList *pButtonState ) const
{
	LockMut(*queuemutex);
	if( pButtonState == NULL )
		pButtonState = &g_CurrentState;
	const DeviceInput *pDI = FindItemBinarySearch( pButtonState->begin(), pButtonState->end(), di );
	if( pDI == NULL )
		return 0;
	return pDI->ts.Ago();
}

float InputFilter::GetLevel( const DeviceInput &di, const DeviceInputList *pButtonState ) const
{
	LockMut(*queuemutex);
	if( pButtonState == NULL )
		pButtonState = &g_CurrentState;
	const DeviceInput *pDI = FindItemBinarySearch( pButtonState->begin(), pButtonState->end(), di );
	if( pDI == NULL )
		return 0.0f;
	return pDI->level;
}

RString InputFilter::GetButtonComment( const DeviceInput &di ) const
{
	LockMut(*queuemutex);
	return GetButtonState( di ).m_sComment;
}

void InputFilter::ResetKeyRepeat( const DeviceInput &di )
{
	LockMut(*queuemutex);
	GetButtonState( di ).m_fSecsHeld = 0;
}

/** @brief Stop repeating the specified key until released. */
void InputFilter::RepeatStopKey( const DeviceInput &di )
{
	LockMut(*queuemutex);

	// If the button is up, do nothing.
	ButtonState &bs = GetButtonState( di );
	if( !bs.m_bLastReportedHeld )
		return;

	g_DisableRepeat.insert( di );
}

void InputFilter::GetInputEvents( vector<InputEvent> &array )
{
	array.clear();
	LockMut(*queuemutex);
	array.swap( queue );
}

void InputFilter::GetPressedButtons( vector<DeviceInput> &array ) const
{
	LockMut(*queuemutex);
	array = g_CurrentState;
}

void InputFilter::UpdateCursorLocation(float _fX, float _fY)
{
	m_MouseCoords.fX = _fX;
	m_MouseCoords.fY = _fY;
}

void InputFilter::UpdateMouseWheel(float _fZ)
{
	m_MouseCoords.fZ = _fZ;
}

// lua start
#include "LuaBinding.h"

/** @brief Allow Lua to have access to InputFilter. */ 
class LunaInputFilter: public Luna<InputFilter>
{
public:
	// todo: Should the input be locked to the theme's width/height instead of
	// the window's width/height? -aj
	static int GetMouseX( T* p, lua_State *L ){
		float fX = p->GetCursorX();
		// Scale input to the theme's dimensions
		fX = SCALE( fX, 0, (PREFSMAN->m_iDisplayHeight * PREFSMAN->m_fDisplayAspectRatio), SCREEN_LEFT, SCREEN_RIGHT );
		lua_pushnumber( L, fX );
		return 1;
	}
	static int GetMouseY( T* p, lua_State *L ){
		float fY = p->GetCursorY();
		// Scale input to the theme's dimensions
		fY = SCALE( fY, 0, PREFSMAN->m_iDisplayHeight, SCREEN_TOP, SCREEN_BOTTOM );
		lua_pushnumber( L, fY );
		return 1;
	}
	static int GetMouseWheel( T* p, lua_State *L ){
		float fZ = p->GetMouseWheel();
		lua_pushnumber( L, fZ );
		return 1;
	}

	LunaInputFilter()
	{
		ADD_METHOD( GetMouseX );
		ADD_METHOD( GetMouseY );
		ADD_METHOD( GetMouseWheel );
	}
};

LUA_REGISTER_CLASS( InputFilter )
// lua end

/*
 * (c) 2001-2004 Chris Danford
 * All rights reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, and/or sell copies of the Software, and to permit persons to
 * whom the Software is furnished to do so, provided that the above
 * copyright notice(s) and this permission notice appear in all copies of
 * the Software and that both the above copyright notice(s) and this
 * permission notice appear in supporting documentation.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
 * THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
 * INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
 * OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */