/* 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 HPL1 Engine.
 */

#include "hpl1/engine/scene/AnimationState.h"

#include "hpl1/engine/graphics/Animation.h"
#include "hpl1/engine/math/Math.h"
#include "hpl1/engine/resources/AnimationManager.h"

#include "hpl1/engine/system/low_level_system.h"

namespace hpl {

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

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

cAnimationState::cAnimationState(cAnimation *apAnimation, const tString &asName,
								 cAnimationManager *apAnimationManager) {
	mpAnimation = apAnimation;

	mpAnimationManager = apAnimationManager;

	mfLength = mpAnimation->GetLength();
	msName = asName;

	mbActive = false;

	mfTimePos = 0;
	mfWeight = 1;
	mfSpeed = 1.0f;
	mfBaseSpeed = 1.0f;
	mfTimePos = 0;
	mfPrevTimePos = 0;

	mbLoop = false;
	mbPaused = false;

	mfSpecialEventTime = 0;

	mfFadeStep = 0;
}

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

cAnimationState::~cAnimationState() {
	STLDeleteAll(mvEvents);

	if (mpAnimationManager)
		mpAnimationManager->Destroy(mpAnimation);
}

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

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

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

void cAnimationState::Update(float afTimeStep) {
	// Update animation
	AddTimePosition(afTimeStep);

	// Fading
	if (mfFadeStep != 0) {
		mfWeight += mfFadeStep * afTimeStep;

		if (mfFadeStep < 0 && mfWeight <= 0) {
			mfWeight = 0;
			mbActive = false;
			mfFadeStep = 0;
		} else if (mfFadeStep > 0 && mfWeight >= 1) {
			mfWeight = 1;
			mfFadeStep = 0;
		}
	}
}

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

bool cAnimationState::IsFading() {
	return mfFadeStep != 0;
}

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

bool cAnimationState::IsOver() {
	if (mbLoop)
		return false;

	return mfTimePos >= mfLength;
}

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

void cAnimationState::FadeIn(float afTime) {
	mfFadeStep = 1.0f / ABS(afTime);
}

void cAnimationState::FadeOut(float afTime) {
	mfFadeStep = -1.0f / ABS(afTime);
}

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

void cAnimationState::SetLength(float afLength) {
	mfLength = afLength;
}

float cAnimationState::GetLength() {
	return mfLength;
}

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

void cAnimationState::SetWeight(float afWeight) {
	mfWeight = afWeight;
}
float cAnimationState::GetWeight() {
	return mfWeight;
}

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

void cAnimationState::SetSpeed(float afSpeed) {
	mfSpeed = afSpeed;
}
float cAnimationState::GetSpeed() {
	return mfSpeed;
}

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

void cAnimationState::SetBaseSpeed(float afSpeed) {
	mfBaseSpeed = afSpeed;
}
float cAnimationState::GetBaseSpeed() {
	return mfBaseSpeed;
}

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

void cAnimationState::SetTimePosition(float afPosition) {
	if (mbLoop) {
		mfTimePos = cMath::Wrap(afPosition, 0, mfLength);
	} else {
		mfTimePos = cMath::Clamp(afPosition, 0, mfLength);
	}
}

float cAnimationState::GetTimePosition() {
	return mfTimePos;
}

float cAnimationState::GetPreviousTimePosition() {
	return mfPrevTimePos;
}

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

void cAnimationState::SetRelativeTimePosition(float afPosition) {
	SetTimePosition(afPosition * mfLength);
}

float cAnimationState::GetRelativeTimePosition() {
	return mfTimePos / mfLength;
}

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

bool cAnimationState::IsActive() {
	return mbActive;
}
void cAnimationState::SetActive(bool abActive) {
	if (mbActive == abActive)
		return;

	mbActive = abActive;

	// Should this really be here?
	mbPaused = false;
	mfFadeStep = 0;
}

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

bool cAnimationState::IsLooping() {
	return mbLoop;
}
void cAnimationState::SetLoop(bool abLoop) {
	mbLoop = abLoop;
}

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

bool cAnimationState::IsPaused() {
	return mbPaused;
}

void cAnimationState::SetPaused(bool abPaused) {
	mbPaused = abPaused;
}

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

bool cAnimationState::IsAfterSpecialEvent() {
	return mfTimePos > mfSpecialEventTime;
}

bool cAnimationState::IsBeforeSpecialEvent() {
	return mfTimePos < mfSpecialEventTime;
}

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

void cAnimationState::AddTimePosition(float afAdd) {
	if (mbPaused)
		return;

	mfPrevTimePos = mfTimePos;

	mfTimePos += afAdd * mfSpeed * mfBaseSpeed;

	SetTimePosition(mfTimePos);
}

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

cAnimation *cAnimationState::GetAnimation() {
	return mpAnimation;
}

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

cAnimationEvent *cAnimationState::CreateEvent() {
	cAnimationEvent *pEvent = hplNew(cAnimationEvent, ());
	pEvent->mfTime = 0;
	pEvent->mType = eAnimationEventType_LastEnum;
	pEvent->msValue = "";
	mvEvents.push_back(pEvent);

	return pEvent;
}

cAnimationEvent *cAnimationState::GetEvent(int alIdx) {
	return mvEvents[alIdx];
}

int cAnimationState::GetEventNum() {
	return (int)mvEvents.size();
}

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

//////////////////////////////////////////////////////////////////////////
// SAVE OBJECT STUFF
//////////////////////////////////////////////////////////////////////////

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

kBeginSerializeBase(cSaveData_cAnimationState)
	kSerializeVar(msName, eSerializeType_String)

		kSerializeVar(msAnimationName, eSerializeType_String)
			kSerializeVar(mfDefaultSpeed, eSerializeType_Float32)

				kSerializeVar(mfLength, eSerializeType_Float32)
					kSerializeVar(mfWeight, eSerializeType_Float32)
						kSerializeVar(mfSpeed, eSerializeType_Float32)
							kSerializeVar(mfTimePos, eSerializeType_Float32)

								kSerializeVar(mbActive, eSerializeType_Bool)
									kSerializeVar(mbLoop, eSerializeType_Bool)
										kSerializeVar(mbPaused, eSerializeType_Bool)

											kSerializeVar(mfFadeStep, eSerializeType_Float32)
												kEndSerialize()

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

	iSaveObject *cSaveData_cAnimationState::CreateSaveObject(cSaveObjectHandler *apSaveObjectHandler, cGame *apGame) {
	return NULL;
}

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

int cSaveData_cAnimationState::GetSaveCreatePrio() {
	return 2;
}

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

iSaveData *cAnimationState::CreateSaveData() {
	return hplNew(cSaveData_cAnimationState, ());
}

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

void cAnimationState::SaveToSaveData(iSaveData *apSaveData) {
	kSaveData_SaveToBegin(cAnimationState);

	kSaveData_SaveTo(msName);

	pData->msAnimationName = mpAnimation->GetFileName();
	kSaveData_SaveTo(mfBaseSpeed);

	kSaveData_SaveTo(mfLength);
	kSaveData_SaveTo(mfWeight);
	kSaveData_SaveTo(mfSpeed);
	kSaveData_SaveTo(mfTimePos);

	kSaveData_SaveTo(mbActive);
	kSaveData_SaveTo(mbLoop);
	kSaveData_SaveTo(mbPaused);

	kSaveData_SaveTo(mfFadeStep);
}

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

void cAnimationState::LoadFromSaveData(iSaveData *apSaveData) {
	kSaveData_LoadFromBegin(cAnimationState);

	kSaveData_LoadFrom(msName);

	kSaveData_LoadFrom(mfLength);
	kSaveData_LoadFrom(mfWeight);
	kSaveData_LoadFrom(mfSpeed);
	kSaveData_LoadFrom(mfTimePos);

	kSaveData_LoadFrom(mfBaseSpeed);

	kSaveData_LoadFrom(mbActive);
	kSaveData_LoadFrom(mbLoop);
	kSaveData_LoadFrom(mbPaused);

	kSaveData_LoadFrom(mfFadeStep);
}

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

void cAnimationState::SaveDataSetup(cSaveObjectHandler *apSaveObjectHandler, cGame *apGame) {
	kSaveData_SetupBegin(cAnimationState);
}

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

} // namespace hpl