/**
 * @file llviewerparcelmediaautoplay.cpp
 * @brief timer to automatically play media in a parcel
 *
 * $LicenseInfo:firstyear=2007&license=viewergpl$
 * 
 * Copyright (c) 2007-2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 * 
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"
#include "llviewerparcelmediaautoplay.h"
#include "llviewerparcelmedia.h"
#include "llviewercontrol.h"
#include "llviewermedia.h"
#include "llparcel.h"
#include "llviewerparcelmgr.h"
#include "lluuid.h"
#include "message.h"
#include "llviewerimagelist.h"         // for texture stats
#include "llagent.h"

const F32 AUTOPLAY_TIME  = 5;          // how many seconds before we autoplay
const F32 AUTOPLAY_SIZE  = 24*24;      // how big the texture must be (pixel area) before we autoplay
const F32 AUTOPLAY_SPEED = 0.1f;        // how slow should the agent be moving to autoplay

LLViewerParcelMediaAutoPlay::LLViewerParcelMediaAutoPlay() :
	LLEventTimer(1),
	mPlayed(FALSE),
	mTimeInParcel(0)
{
}

static LLViewerParcelMediaAutoPlay *sAutoPlay = NULL;

// static
void LLViewerParcelMediaAutoPlay::initClass()
{
	if (!sAutoPlay)
		sAutoPlay = new LLViewerParcelMediaAutoPlay;
}

// static
void LLViewerParcelMediaAutoPlay::cleanupClass()
{
	if (sAutoPlay)
		delete sAutoPlay;
}

// static
void LLViewerParcelMediaAutoPlay::playStarted()
{
	if (sAutoPlay)
	{
		sAutoPlay->mPlayed = TRUE;
	}
}

BOOL LLViewerParcelMediaAutoPlay::tick()
{
	LLParcel *this_parcel = NULL;
	std::string this_media_url;
	LLUUID this_media_texture_id;
	S32 this_parcel_id = 0;

	this_parcel = LLViewerParcelMgr::getInstance()->getAgentParcel();

	if (this_parcel)
	{
		this_media_url = std::string(this_parcel->getMediaURL());

		this_media_texture_id = this_parcel->getMediaID();

		this_parcel_id = this_parcel->getLocalID();
	}

	if (this_parcel_id != mLastParcelID)
	{
		// we've entered a new parcel
		mPlayed    = FALSE;                   // we haven't autoplayed yet
		mTimeInParcel = 0;                    // reset our timer
		mLastParcelID = this_parcel_id;
	}

	mTimeInParcel += mPeriod;                 // increase mTimeInParcel by the amount of time between ticks

	if ((!mPlayed) &&                         // if we've never played
		(mTimeInParcel > AUTOPLAY_TIME) &&    // and if we've been here for so many seconds
		(this_media_url.size() != 0) &&       // and if the parcel has media
		(!LLViewerMedia::isMediaPlaying()))   // and if the media is not already playing
	{
		if (this_media_texture_id.notNull())  // and if the media texture is good
		{
			LLViewerImage *image = gImageList.getImage(this_media_texture_id, FALSE);

			F32 image_size = 0;

			if (image)
			{
				image_size = image->mMaxVirtualSize;
			}

			if (gAgent.getVelocity().magVec() < AUTOPLAY_SPEED) // and if the agent is stopped (slow enough)
			{
				if (image_size > AUTOPLAY_SIZE)    // and if the target texture is big enough on screen
				{
					if (this_parcel)
					{
						if (gSavedSettings.getBOOL("ParcelMediaAutoPlayEnable"))
						{
							// and last but not least, only play when autoplay is enabled
							LLViewerParcelMedia::play(this_parcel);
						}
					}

					mPlayed = TRUE;
				}
			}
		}
	}


	return FALSE; // continue ticking forever please.
}