#include "quakedef.h"
#include "cl_video.h"
#include "dpvsimpledecode.h"

// constants (and semi-constants)
static int  cl_videormask;
static int  cl_videobmask;
static int  cl_videogmask;
static int	cl_videobytesperpixel;

static int cl_num_videos;
static clvideo_t cl_videos[ MAXCLVIDEOS ];
static rtexturepool_t *cl_videotexturepool;

static clvideo_t *FindUnusedVid( void )
{
	int i;
	for( i = 1 ; i < MAXCLVIDEOS ; i++ )
		if( cl_videos[ i ].state == CLVIDEO_UNUSED )
			return &cl_videos[ i ];
	return NULL;
}

static qboolean OpenStream( clvideo_t * video )
{
	char *errorstring;
	video->stream = dpvsimpledecode_open( video->filename, &errorstring);
	if (!video->stream )
	{
		Con_Printf("unable to open \"%s\", error: %s\n", video->filename, errorstring);
		return false;
	}
	return true;
}

static void SuspendVideo( clvideo_t * video )
{
	if( video->suspended )
		return;
	video->suspended = true;
	// free the texture
	R_FreeTexture( video->cpif.tex );
	// free the image data
	Mem_Free( video->imagedata );
	// if we are in firstframe mode, also close the stream
	if( video->state == CLVIDEO_FIRSTFRAME )
		dpvsimpledecode_close( video->stream );
}

static qboolean WakeVideo( clvideo_t * video )
{
	if( !video->suspended )
		return true;
	video->suspended = false;

	if( video->state == CLVIDEO_FIRSTFRAME )
		if( !OpenStream( video ) ) {
			video->state = CLVIDEO_UNUSED;
			return false;
		}

	video->imagedata = Mem_Alloc( cls.permanentmempool, video->cpif.width * video->cpif.height * cl_videobytesperpixel );
	video->cpif.tex = R_LoadTexture2D( cl_videotexturepool, video->cpif.name,
		video->cpif.width, video->cpif.height, NULL, TEXTYPE_RGBA, TEXF_ALWAYSPRECACHE, NULL );

	// update starttime
	video->starttime += realtime - video->lasttime;

	return true;
}

static clvideo_t* OpenVideo( clvideo_t *video, const char *filename, const char *name, int owner )
{
	strlcpy( video->filename, filename, sizeof(video->filename) );
	video->ownertag = owner;
	if( strncmp( name, CLVIDEOPREFIX, sizeof( CLVIDEOPREFIX ) - 1 ) )
		return NULL;
	strlcpy( video->cpif.name, name, sizeof(video->cpif.name) );

	if( !OpenStream( video ) )
		return NULL;

	video->state = CLVIDEO_FIRSTFRAME;
	video->framenum = -1;
	video->framerate = dpvsimpledecode_getframerate( video->stream );
	video->lasttime = realtime;

	video->cpif.width = dpvsimpledecode_getwidth( video->stream );
	video->cpif.height = dpvsimpledecode_getheight( video->stream );
	video->cpif.tex = R_LoadTexture2D( cl_videotexturepool, video->cpif.name,
		video->cpif.width, video->cpif.height, NULL, TEXTYPE_RGBA, TEXF_ALWAYSPRECACHE, NULL );

    video->imagedata = Mem_Alloc( cls.permanentmempool, video->cpif.width * video->cpif.height * cl_videobytesperpixel );

	return video;
}

clvideo_t* CL_OpenVideo( const char *filename, const char *name, int owner )
{
	clvideo_t *video;

	video = FindUnusedVid();
	if( !video ) {
		Con_Printf( "unable to open video \"%s\" - video limit reached\n", filename );
		return NULL;
	}
	video = OpenVideo( video, filename, name, owner );
	// expand the active range to include the new entry
	if (video)
		cl_num_videos = max(cl_num_videos, (int)(video - cl_videos) + 1);
	return video;
}

static clvideo_t* CL_GetVideoBySlot( int slot )
{
	clvideo_t *video = &cl_videos[ slot ];

	if( video->suspended )
	{
		if( !WakeVideo( video ) )
			return NULL;
		else if( video->state == CLVIDEO_RESETONWAKEUP )
			video->framenum = -1;
	}

	video->lasttime = realtime;

	return video;
}

clvideo_t *CL_GetVideoByName( const char *name )
{
	int i;

	for( i = 0 ; i < cl_num_videos ; i++ )
		if( cl_videos[ i ].state != CLVIDEO_UNUSED
			&&	!strcmp( cl_videos[ i ].cpif.name , name ) )
			break;
	if( i != cl_num_videos )
		return CL_GetVideoBySlot( i );
	else
		return NULL;
}

void CL_SetVideoState( clvideo_t *video, clvideostate_t state )
{
	if( !video )
		return;

	video->lasttime = realtime;
	video->state = state;
	if( state == CLVIDEO_FIRSTFRAME )
		CL_RestartVideo( video );
}

void CL_RestartVideo( clvideo_t *video )
{
	if( !video )
		return;

	video->starttime = video->lasttime = realtime;
	video->framenum = -1;

	dpvsimpledecode_close( video->stream );
	if( !OpenStream( video ) )
		video->state = CLVIDEO_UNUSED;
}

void CL_CloseVideo( clvideo_t * video )
{
	if( !video || video->state == CLVIDEO_UNUSED )
		return;

	if( !video->suspended || video->state != CLVIDEO_FIRSTFRAME )
		dpvsimpledecode_close( video->stream );
	if( !video->suspended ) {
		Mem_Free( video->imagedata );
		R_FreeTexture( video->cpif.tex );
	}

	video->state = CLVIDEO_UNUSED;
}

static void VideoFrame( clvideo_t *video )
{
	int destframe;

	if( video->state == CLVIDEO_FIRSTFRAME )
		destframe = 0;
	else
		destframe = (int)((realtime - video->starttime) * video->framerate);
	if( destframe < 0 )
		destframe = 0;
	if( video->framenum < destframe ) {
		do {
			video->framenum++;
			if( dpvsimpledecode_video( video->stream, video->imagedata, cl_videormask,
				cl_videogmask, cl_videobmask, cl_videobytesperpixel,
				cl_videobytesperpixel * video->cpif.width )
				) { // finished?
				CL_RestartVideo( video );
				if( video->state == CLVIDEO_PLAY )
						video->state = CLVIDEO_FIRSTFRAME;
				return;
			}
		} while( video->framenum < destframe );
		R_UpdateTexture( video->cpif.tex, (unsigned char *)video->imagedata, 0, 0, video->cpif.width, video->cpif.height );
	}
}

void CL_VideoFrame( void ) // update all videos
{
	int i;
	clvideo_t *video;

	if (!cl_num_videos)
		return;

	for( video = cl_videos, i = 0 ; i < cl_num_videos ; video++, i++ )
		if( video->state != CLVIDEO_UNUSED && !video->suspended )
		{
			if( realtime - video->lasttime > CLTHRESHOLD )
				SuspendVideo( video );
			else if( video->state == CLVIDEO_PAUSE )
				video->starttime = realtime - video->framenum * video->framerate;
			else
				VideoFrame( video );
		}

	if( cl_videos->state == CLVIDEO_FIRSTFRAME )
		CL_VideoStop();

	// reduce range to exclude unnecessary entries
	while (cl_num_videos > 0 && cl_videos[cl_num_videos-1].state == CLVIDEO_UNUSED)
		cl_num_videos--;
}

void CL_Video_Shutdown( void )
{
	int i;
	for( i = 0 ; i < cl_num_videos ; i++ )
		CL_CloseVideo( &cl_videos[ i ] );
}

void CL_PurgeOwner( int owner )
{
	int i;
	for( i = 0 ; i < cl_num_videos ; i++ )
		if( cl_videos[ i ].ownertag == owner )
			CL_CloseVideo( &cl_videos[ i ] );
}

int cl_videoplaying = false; // old, but still supported

void CL_DrawVideo(void)
{
	if (cl_videoplaying)
		DrawQ_Pic(0, 0, &CL_GetVideoBySlot( 0 )->cpif, vid_conwidth.integer, vid_conheight.integer, 1, 1, 1, 1, 0);
}

void CL_VideoStart(char *filename)
{
	Host_StartVideo();

	if( cl_videos->state != CLVIDEO_UNUSED )
		CL_CloseVideo( cl_videos );
	if( !OpenVideo( cl_videos, filename, va( CLVIDEOPREFIX "%s", filename ), 0 ) )
		return;
	// expand the active range to include the new entry
	cl_num_videos = max(cl_num_videos, 1);

	cl_videoplaying = true;

	CL_SetVideoState( cl_videos, CLVIDEO_PLAY );
	CL_RestartVideo( cl_videos );
}

void CL_Video_KeyEvent( int key, int ascii, qboolean down ) 
{
	// only react to up events, to allow the user to delay the abortion point if it suddenly becomes interesting..
	if( !down ) {
		if( key == K_ESCAPE || key == K_ENTER || key == K_SPACE ) {
			CL_VideoStop();
		}
	}
}

void CL_VideoStop(void)
{
	cl_videoplaying = false;

	CL_CloseVideo( cl_videos );
}

static void CL_PlayVideo_f(void)
{
	char name[MAX_QPATH];

	Host_StartVideo();

	if (Cmd_Argc() != 2)
	{
		Con_Print("usage: playvideo <videoname>\nplays video named video/<videoname>.dpv\n");
		return;
	}

	sprintf(name, "video/%s.dpv", Cmd_Argv(1));
	CL_VideoStart(name);
}

static void CL_StopVideo_f(void)
{
	CL_VideoStop();
}

static void cl_video_start( void )
{
	int i;
	clvideo_t *video;

	cl_videotexturepool = R_AllocTexturePool();

	for( video = cl_videos, i = 0 ; i < cl_num_videos ; i++, video++ )
		if( video->state != CLVIDEO_UNUSED && !video->suspended )
			video->cpif.tex = R_LoadTexture2D( cl_videotexturepool, video->cpif.name,
				video->cpif.width, video->cpif.height, NULL, TEXTYPE_RGBA, TEXF_ALWAYSPRECACHE, NULL );
}

static void cl_video_shutdown( void )
{
	R_FreeTexturePool( &cl_videotexturepool );
}

static void cl_video_newmap( void )
{
}

void CL_Video_Init( void )
{
	cl_num_videos = 0;
	cl_videobytesperpixel = 4;
	cl_videormask = BigLong(0xFF000000);
	cl_videogmask = BigLong(0x00FF0000);
	cl_videobmask = BigLong(0x0000FF00);

	Cmd_AddCommand( "playvideo", CL_PlayVideo_f, "play a .dpv video file" );
	Cmd_AddCommand( "stopvideo", CL_StopVideo_f, "stop playing a .dpv video file" );

	R_RegisterModule( "CL_Video", cl_video_start, cl_video_shutdown, cl_video_newmap );
}