/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/*
 * Copyright (C) 2006-2010 - Frictional Games
 *
 * This file is part of Penumbra Overture.
 */

#include "hpl1/penumbra-overture/FadeHandler.h"

#include "hpl1/penumbra-overture/GameEntity.h"
#include "hpl1/penumbra-overture/Init.h"
#include "hpl1/penumbra-overture/Inventory.h"
#include "hpl1/penumbra-overture/Player.h"

//////////////////////////////////////////////////////////////////////////
// CONSTRUCTORS
//////////////////////////////////////////////////////////////////////////

//-----------------------------------------------------------------------

cFadeHandler::cFadeHandler(cInit *apInit) : iUpdateable("FadeHandler") {
	mpInit = apInit;

	mpDrawer = mpInit->mpGame->GetGraphics()->GetDrawer();

	mpBlackGfx = mpDrawer->CreateGfxObject("effect_black.bmp", "diffalpha2d");

	Reset();
}

//-----------------------------------------------------------------------

cFadeHandler::~cFadeHandler(void) {
	mpDrawer->DestroyGfxObject(mpBlackGfx);
}

//-----------------------------------------------------------------------

//////////////////////////////////////////////////////////////////////////
// PUBLIC METHODS
//////////////////////////////////////////////////////////////////////////

//-----------------------------------------------------------------------

void cFadeHandler::FadeOut(float afTime) {
	if (afTime <= 0)
		mfAlphaAdd = 1000000.0f;
	else
		mfAlphaAdd = (1.0f / afTime);

	mbActive = true;

	Update(1.0f / 60.0f);
}

//-----------------------------------------------------------------------

void cFadeHandler::FadeIn(float afTime) {
	if (afTime <= 0)
		mfAlphaAdd = -100000.0f;
	else
		mfAlphaAdd = -(1.0f / afTime);

	mbActive = true;

	Update(1.0f / 60.0f);
}

//-----------------------------------------------------------------------

bool cFadeHandler::IsActive() {
	return mbActive;
}

//-----------------------------------------------------------------------

void cFadeHandler::OnStart() {
}

//-----------------------------------------------------------------------

void cFadeHandler::SetWideScreenActive(bool abX) {
	mbWideScreenActive = abX;
}

//-----------------------------------------------------------------------

void cFadeHandler::Update(float afTimeStep) {
	if (mbActive) {
		mfAlpha += mfAlphaAdd * afTimeStep;

		if (mfAlphaAdd < 0) {
			if (mfAlpha < 0) {
				mbActive = false;
				mfAlpha = 0;
			}
		} else {
			if (mfAlpha > 1) {
				mbActive = false;
				mfAlpha = 1;
			}
		}
	}

	//////////////////////////////////
	// Wide Screen
	if (mbWideScreenActive) {
		mfWideScreenAlpha += 0.8f * afTimeStep;
		if (mfWideScreenAlpha > 1)
			mfWideScreenAlpha = 1;
	} else {
		mfWideScreenAlpha -= 0.7f * afTimeStep;
		if (mfWideScreenAlpha < 0)
			mfWideScreenAlpha = 0;
	}
}

//-----------------------------------------------------------------------

void cFadeHandler::Reset() {
	mfWideScreenAlpha = 0;
	mbWideScreenActive = false;

	mfAlpha = 0;
	mfAlphaAdd = 0;
	mbActive = false;
}

//-----------------------------------------------------------------------

void cFadeHandler::OnDraw() {
	if (mfAlpha != 0)
		mpDrawer->DrawGfxObject(mpBlackGfx, cVector3f(0, 0, 150), cVector2f(800, 600), cColor(1, mfAlpha));

	if (mfWideScreenAlpha != 0) {
		mpDrawer->DrawGfxObject(mpBlackGfx, cVector3f(0, 0, 40), cVector2f(800, 75), cColor(1, mfWideScreenAlpha));
		mpDrawer->DrawGfxObject(mpBlackGfx, cVector3f(0, 525, 40), cVector2f(800, 75), cColor(1, mfWideScreenAlpha));
	}
}

//-----------------------------------------------------------------------