#include "global.h"
#include "MovieTexture_Generic.h"
#include "PrefsManager.h"
#include "RageDisplay.h"
#include "RageLog.h"
#include "RageSurface.h"
#include "RageTextureManager.h"
#include "RageUtil.h"

#if defined(WIN32) && !defined(XBOX)
#include "archutils/Win32/ErrorStrings.h"
#include <windows.h>
#endif


MovieTexture_Generic::MovieTexture_Generic( RageTextureID ID, MovieDecoder *pDecoder ):
	RageMovieTexture( ID ),
	m_BufferFinished( "BufferFinished", 0 )
{
	LOG->Trace( "MovieTexture_Generic::MovieTexture_Generic(%s)", ID.filename.c_str() );

	m_pDecoder = pDecoder;

	m_uTexHandle = 0;
	m_bLoop = true;
	m_State = DECODER_QUIT; /* it's quit until we call StartThread */
	m_pSurface = NULL;
	m_ImageWaiting = FRAME_NONE;
	m_fRate = 1;
	m_bWantRewind = false;
	m_fClock = 0;
	m_bFrameSkipMode = false;
	m_bThreaded = PREFSMAN->m_bThreadedMovieDecode.Get();
}

RString MovieTexture_Generic::Init()
{
	RString sError = m_pDecoder->Open( GetID().filename );
	if( sError != "" )
		return sError;

	CreateTexture();
	CreateFrameRects();

	/* Decode one frame, to guarantee that the texture is drawn when this function returns. */
	int ret = m_pDecoder->GetFrame( m_pSurface, -1 );
	if( ret == -1 )
		return ssprintf( "%s: error getting first frame", GetID().filename.c_str() );
	if( ret == 0 )
	{
		/* There's nothing there. */
		return ssprintf( "%s: EOF getting first frame", GetID().filename.c_str() );
	}

	m_ImageWaiting = FRAME_WAITING;

	LOG->Trace( "Resolution: %ix%i (%ix%i, %ix%i)",
			m_iSourceWidth, m_iSourceHeight,
			m_iImageWidth, m_iImageHeight, m_iTextureWidth, m_iTextureHeight );

	UpdateFrame();

	CHECKPOINT;

	StartThread();

	return RString();
}

MovieTexture_Generic::~MovieTexture_Generic()
{
	StopThread();
	if( m_pDecoder )
		m_pDecoder->Close();
	DestroyTexture();

	delete m_pDecoder;
}

/* Delete the surface and texture.  The decoding thread must be stopped, and this
 * is normally done after destroying the decoder. */
void MovieTexture_Generic::DestroyTexture()
{
	delete m_pSurface;
	m_pSurface = NULL;

	if( m_uTexHandle )
	{
		DISPLAY->DeleteTexture( m_uTexHandle );
		m_uTexHandle = 0;
	}
}


void MovieTexture_Generic::CreateTexture()
{
	if( m_uTexHandle )
		return;

	CHECKPOINT;

	m_iSourceWidth  = m_pDecoder->GetWidth();
	m_iSourceHeight = m_pDecoder->GetHeight();

	/* Adjust m_iSourceWidth to support different source aspect ratios. */
	float fSourceAspectRatio = m_pDecoder->GetSourceAspectRatio();
	if( fSourceAspectRatio < 1 )
		m_iSourceHeight = lrintf( m_iSourceHeight / fSourceAspectRatio );
	else if( fSourceAspectRatio > 1 )
		m_iSourceWidth = lrintf( m_iSourceWidth * fSourceAspectRatio );

	/* Cap the max texture size to the hardware max. */
	int iMaxSize = min( GetID().iMaxSize, DISPLAY->GetMaxTextureSize() );
	m_iImageWidth = min( m_iSourceWidth, iMaxSize );
	m_iImageHeight = min( m_iSourceHeight, iMaxSize );

	/* Texture dimensions need to be a power of two; jump to the next. */
	m_iTextureWidth = power_of_two( m_iImageWidth );
	m_iTextureHeight = power_of_two( m_iImageHeight );

	if( m_pSurface == NULL )
		m_pSurface = m_pDecoder->CreateCompatibleSurface( m_iTextureWidth, m_iTextureHeight, TEXTUREMAN->GetPrefs().m_iMovieColorDepth == 32 );

	PixelFormat pixfmt = DISPLAY->FindPixelFormat( m_pSurface->format->BitsPerPixel,
			m_pSurface->format->Mask[0],
			m_pSurface->format->Mask[1],
			m_pSurface->format->Mask[2],
			m_pSurface->format->Mask[3] );

	if( pixfmt == PixelFormat_INVALID )
	{
		/* We weren't given a natively-supported pixel format.  Pick a supported
		 * one.  This is a fallback case, and implies a second conversion. */
		switch( TEXTUREMAN->GetPrefs().m_iMovieColorDepth )
		{
		default:
			ASSERT(0);
		case 16:
			if( DISPLAY->SupportsTextureFormat(PixelFormat_RGB5) )
				pixfmt = PixelFormat_RGB5;
			else
				pixfmt = PixelFormat_RGBA4;

			break;

		case 32:
			if( DISPLAY->SupportsTextureFormat(PixelFormat_RGB8) )
				pixfmt = PixelFormat_RGB8;
			else if( DISPLAY->SupportsTextureFormat(PixelFormat_RGBA8) )
				pixfmt = PixelFormat_RGBA8;
			else if( DISPLAY->SupportsTextureFormat(PixelFormat_RGB5) )
				pixfmt = PixelFormat_RGB5;
			else
				pixfmt = PixelFormat_RGBA4;
			break;
		}
	}

	m_uTexHandle = DISPLAY->CreateTexture( pixfmt, m_pSurface, false );
}


/* Handle decoding for a frame.  Return true if a frame was decoded, false if not
 * (due to quit, error, EOF, etc).  If true is returned, we'll be in FRAME_DECODED. */
bool MovieTexture_Generic::DecodeFrame()
{
	ASSERT_M( m_ImageWaiting == FRAME_NONE, ssprintf("%i", m_ImageWaiting) );

	bool bTriedRewind = false;
	do
	{
		if( m_State == DECODER_QUIT )
			return false;

		if( m_bWantRewind )
		{
			if( bTriedRewind )
			{
				LOG->Trace( "File \"%s\" looped more than once in one frame", GetID().filename.c_str() );
				return false;
			}
			m_bWantRewind = false;
			bTriedRewind = true;

			/* When resetting the clock, set it back by the length of the last frame,
			 * so it has a proper delay. */
			float fDelay = m_pDecoder->GetFrameDuration();

			/* Restart. */
			m_pDecoder->Close();
			RString sError = m_pDecoder->Open( GetID().filename );
			if( sError != "" )
				RageException::Throw( "Error rewinding stream \"%s\": %s", GetID().filename.c_str(), sError.c_str() );

			m_fClock = -fDelay;
		}

		CHECKPOINT;

		/* Read a frame. */
		float fTargetTime = -1;
		if( m_bFrameSkipMode && m_fClock > m_pDecoder->GetTimestamp() )
			fTargetTime = m_fClock;

		int ret = m_pDecoder->GetFrame( m_pSurface, fTargetTime );
		if( ret == -1 )
			return false;

		if( m_bWantRewind && m_pDecoder->GetTimestamp() == 0 )
			m_bWantRewind = false; /* ignore */

		if( ret == 0 )
		{
			/* EOF. */
			if( !m_bLoop )
				return false;

			LOG->Trace( "File \"%s\" looping", GetID().filename.c_str() );
			m_bWantRewind = true;
			continue;
		}

		/* We got a frame. */
		m_ImageWaiting = FRAME_DECODED;
	} while( m_bWantRewind );

	return true;
}

/*
 * Call when m_ImageWaiting == FRAME_DECODED.
 * Returns:
 *  == 0 if the currently decoded frame is ready to be displayed
 *   > 0 (seconds) if it's not yet time to display;
 */
float MovieTexture_Generic::CheckFrameTime()
{
	ASSERT_M( m_ImageWaiting == FRAME_DECODED, ssprintf("%i", m_ImageWaiting) );

	if( m_fRate == 0 )
		return 1;	// "a long time until the next frame"

	const float fOffset = (m_pDecoder->GetTimestamp() - m_fClock) / m_fRate;

	/* If we're ahead, we're decoding too fast; delay. */
	if( fOffset > 0.00001f )
	{
		if( m_bFrameSkipMode )
		{
			/* We're caught up; stop skipping frames. */
			LOG->Trace( "stopped skipping frames" );
			m_bFrameSkipMode = false;
		}
		return fOffset;
	}

	/*
	 * We're behind by -Offset seconds.  
	 *
	 * If we're just slightly behind, don't worry about it; we'll simply
	 * not sleep, so we'll move as fast as we can to catch up.
	 *
	 * If we're far behind, we're short on CPU.  Skip texture updates; this
	 * is a big bottleneck on many systems.
	 *
	 * If we hit a threshold, start skipping frames via #1.  If we do that,
	 * don't stop once we hit the threshold; keep doing it until we're fully
	 * caught up.
	 *
	 * We should try to notice if we simply don't have enough CPU for the video;
	 * it's better to just stay in frame skip mode than to enter and exit it
	 * constantly, but we don't want to do that due to a single timing glitch.
	 */
	const float FrameSkipThreshold = 0.5f;

	if( -fOffset >= FrameSkipThreshold && !m_bFrameSkipMode )
	{
		LOG->Trace( "(%s) Time is %f, and the movie is at %f.  Entering frame skip mode.",
			GetID().filename.c_str(), m_fClock, m_pDecoder->GetTimestamp() );
		m_bFrameSkipMode = true;
	}

	return 0;
}

void MovieTexture_Generic::DiscardFrame()
{
	ASSERT_M( m_ImageWaiting == FRAME_DECODED, ssprintf("%i", m_ImageWaiting) );
	m_ImageWaiting = FRAME_NONE;
}

void MovieTexture_Generic::DecoderThread()
{
#if defined(_WINDOWS)
	/* Windows likes to boost priority when processes come out of a wait state.  We don't
	 * want that, since it'll result in us having a small priority boost after each movie
	 * frame, resulting in skips in the gameplay thread. */
	if( !SetThreadPriorityBoost(GetCurrentThread(), TRUE) && GetLastError() != ERROR_CALL_NOT_IMPLEMENTED )
		LOG->Warn( werr_ssprintf(GetLastError(), "SetThreadPriorityBoost failed") );
#endif

	CHECKPOINT;

	while( m_State != DECODER_QUIT )
	{
		if( m_ImageWaiting == FRAME_NONE )
			DecodeFrame();

		/* If we still have no frame, we're at EOF and we didn't loop. */
		if( m_ImageWaiting != FRAME_DECODED )
		{
			usleep( 10000 );
			continue;
		}

		const float fTime = CheckFrameTime();
		if( fTime > 0 )		// not time to decode a new frame yet
		{
			/* This needs to be relatively short so that we wake up quickly 
			 * from being paused or for changes in m_fRate. */
			usleep( 10000 );
		}
		else // fTime == 0
		{
			{
				/* The only reason m_BufferFinished might be non-zero right now (before
				 * ConvertFrame()) is if we're quitting. */
				int n = m_BufferFinished.GetValue();
				ASSERT_M( n == 0 || m_State == DECODER_QUIT, ssprintf("%i, %i", n, m_State) );
			}

			m_ImageWaiting = FRAME_WAITING;

			/* We just went into FRAME_WAITING.  Don't actually check; the main thread
			 * will change us back to FRAME_NONE without locking, and poke m_BufferFinished.
			 * Don't time out on this; if a new screen has started loading, this might not
			 * return for a while. */
			m_BufferFinished.Wait( false );

			/* If the frame wasn't used, then we must be shutting down. */
			ASSERT_M( m_ImageWaiting == FRAME_NONE || m_State == DECODER_QUIT, ssprintf("%i, %i", m_ImageWaiting, m_State) );
		}
	}
	CHECKPOINT;
}

void MovieTexture_Generic::Update(float fDeltaTime)
{
	/* We might need to decode more than one frame per update.  However, there
	 * have been bugs in ffmpeg that cause it to not handle EOF properly, which
	 * could make this never return, so let's play it safe. */
	int iMax = 4;
	while( --iMax )
	{
		if( !m_bThreaded )
		{
			/* If we don't have a frame decoded, decode one. */
			if( m_ImageWaiting == FRAME_NONE )
				DecodeFrame();

			/* If we have a frame decoded, see if it's time to display it. */
			if( m_ImageWaiting == FRAME_DECODED )
			{
				float fTime = CheckFrameTime();
				if( fTime > 0 )
					return;
				else
					m_ImageWaiting = FRAME_WAITING;
			}
		}

		/* Note that if there's an image waiting, we *must* signal m_BufferFinished, or
		* the decoder thread may sit around waiting for it, even though Pause and Play
		* calls, causing the clock to keep running. */
		if( m_ImageWaiting != FRAME_WAITING )
			return;
		CHECKPOINT;

		UpdateFrame();
		
		if( m_bThreaded )
			m_BufferFinished.Post();
	}

	LOG->MapLog( "movie_looping", "MovieTexture_Generic::Update looping" );
}

/* Call from the main thread when m_ImageWaiting == FRAME_WAITING to update the
 * texture.  Sets FRAME_NONE.  Does not signal m_BufferFinished. */
void MovieTexture_Generic::UpdateFrame()
{
	ASSERT_M( m_ImageWaiting == FRAME_WAITING, ssprintf("%i", m_ImageWaiting) );

	/* Just in case we were invalidated: */
	CreateTexture();

	CHECKPOINT;
	DISPLAY->UpdateTexture(
		m_uTexHandle,
		m_pSurface,
		0, 0,
		m_iImageWidth, m_iImageHeight );
	CHECKPOINT;

	m_ImageWaiting = FRAME_NONE;
}

void MovieTexture_Generic::Reload()
{
}

void MovieTexture_Generic::StartThread()
{
	ASSERT( m_State == DECODER_QUIT );
	m_State = DECODER_RUNNING;
	m_DecoderThread.SetName( ssprintf("MovieTexture_Generic(%s)", GetID().filename.c_str()) );
	
	if( m_bThreaded )
		m_DecoderThread.Create( DecoderThread_start, this );
}

void MovieTexture_Generic::StopThread()
{
	if( !m_DecoderThread.IsCreated() )
		return;

	LOG->Trace("Shutting down decoder thread ...");

	m_State = DECODER_QUIT;

	/* Make sure we don't deadlock waiting for m_BufferFinished. */
	m_BufferFinished.Post();
	CHECKPOINT;
	m_DecoderThread.Wait();
	CHECKPOINT;
	
	m_ImageWaiting = FRAME_NONE;

	/* Clear the above post, if the thread didn't. */
	m_BufferFinished.TryWait();

	LOG->Trace("Decoder thread shut down.");
}

void MovieTexture_Generic::SetPosition( float fSeconds )
{
	ASSERT( m_State != DECODER_QUIT );

	/* We can reset to 0, but I don't think this API supports fast seeking
	 * yet.  I don't think we ever actually seek except to 0 right now,
	 * anyway. XXX */
	if( fSeconds != 0 )
	{
		LOG->Warn( "MovieTexture_Generic::SetPosition(%f): non-0 seeking unsupported; ignored", fSeconds );
		return;
	}

	LOG->Trace( "Seek to %f", fSeconds );
	m_bWantRewind = true;
}

/* This is used to decode data. */
void MovieTexture_Generic::DecodeSeconds( float fSeconds )
{
	m_fClock += fSeconds * m_fRate;

	/* If we're not threaded, we want to be sure to decode any new frames now,
	 * and not on the next frame.  Update() may have already been called for this
	 * frame; call it again to be sure. */
	Update(0);
}

/*
 * (c) 2003-2005 Glenn Maynard
 * 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.
 */