/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (the "License"); you may not use this file

 *   except in compliance with the License. You may obtain a copy of

 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .

 */

#include <memory>

#include <drawinglayer/animation/animationtiming.hxx>

#include <basegfx/numeric/ftools.hxx>

namespace drawinglayer::animation

{

        AnimationEntry::AnimationEntry()

        {

        }

        AnimationEntry::~AnimationEntry()

        {

        }

        AnimationEntryFixed::AnimationEntryFixed(double fDuration, double fState)

        :   mfDuration(fDuration),

            mfState(fState)

        {

        }

        AnimationEntryFixed::~AnimationEntryFixed()

        {

        }

        std::unique_ptr<AnimationEntry> AnimationEntryFixed::clone() const

        {

            return std::make_unique<AnimationEntryFixed>(mfDuration, mfState);

        }

        bool AnimationEntryFixed::operator==(const AnimationEntry& rCandidate) const

        {

            const AnimationEntryFixed* pCompare = dynamic_cast< const AnimationEntryFixed* >(&rCandidate);

            return (pCompare

                && basegfx::fTools::equal(mfDuration, pCompare->mfDuration)

                && basegfx::fTools::equal(mfState, pCompare->mfState));

        }

        double AnimationEntryFixed::getDuration() const

        {

            return mfDuration;

        }

        double AnimationEntryFixed::getStateAtTime(double /*fTime*/) const

        {

            return mfState;

        }

        double AnimationEntryFixed::getNextEventTime(double fTime) const

        {

            if(basegfx::fTools::less(fTime, mfDuration))

            {

                return mfDuration;

            }

            else

            {

                return 0.0;

            }

        }

        AnimationEntryLinear::AnimationEntryLinear(double fDuration, double fFrequency, double fStart, double fStop)

        :   mfDuration(fDuration),

            mfFrequency(fFrequency),

            mfStart(fStart),

            mfStop(fStop)

        {

        }

        AnimationEntryLinear::~AnimationEntryLinear()

        {

        }

        std::unique_ptr<AnimationEntry> AnimationEntryLinear::clone() const

        {

            return std::make_unique<AnimationEntryLinear>(mfDuration, mfFrequency, mfStart, mfStop);

        }

        bool AnimationEntryLinear::operator==(const AnimationEntry& rCandidate) const

        {

            const AnimationEntryLinear* pCompare = dynamic_cast< const AnimationEntryLinear* >(&rCandidate);

            return (pCompare

                && basegfx::fTools::equal(mfDuration, pCompare->mfDuration)

                && basegfx::fTools::equal(mfStart, pCompare->mfStart)

                && basegfx::fTools::equal(mfStop, pCompare->mfStop));

        }

        double AnimationEntryLinear::getDuration() const

        {

            return mfDuration;

        }

        double AnimationEntryLinear::getStateAtTime(double fTime) const

        {

            if(mfDuration > 0.0)

            {

                const double fFactor(fTime / mfDuration);

                if(fFactor > 1.0)

                {

                    return mfStop;

                }

                else

                {

                    return mfStart + ((mfStop - mfStart) * fFactor);

                }

            }

            else

            {

                return mfStart;

            }

        }

        double AnimationEntryLinear::getNextEventTime(double fTime) const

        {

            if(basegfx::fTools::less(fTime, mfDuration))

            {

                // use the simple solution: just add the frequency. More correct (but also more

                // complicated) would be to calculate the slice of time we are in and when this

                // slice will end. For the animations, this makes no quality difference.

                fTime += mfFrequency;

                if(basegfx::fTools::more(fTime, mfDuration))

                {

                    fTime = mfDuration;

                }

                return fTime;

            }

            else

            {

                return 0.0;

            }

        }

        AnimationEntryList::Entries::size_type AnimationEntryList::impGetIndexAtTime(double fTime, double &rfAddedTime) const

        {

            Entries::size_type nIndex(0);

            while(nIndex < maEntries.size() && basegfx::fTools::lessOrEqual(rfAddedTime + maEntries[nIndex]->getDuration(), fTime))

            {

                rfAddedTime += maEntries[nIndex++]->getDuration();

            }

            return nIndex;

        }

        AnimationEntryList::AnimationEntryList()

        :   mfDuration(0.0)

        {

        }

        AnimationEntryList::~AnimationEntryList()

        {

        }

        std::unique_ptr<AnimationEntry> AnimationEntryList::clone() const

        {

            std::unique_ptr<AnimationEntryList> pNew(std::make_unique<AnimationEntryList>());

            for(const auto &i : maEntries)

            {

                pNew->append(*i);

            }

            return pNew;

        }

        bool AnimationEntryList::operator==(const AnimationEntry& rCandidate) const

        {

            const AnimationEntryList* pCompare = dynamic_cast<const AnimationEntryList*>(&rCandidate);

            if (pCompare && mfDuration == pCompare->mfDuration) 

            {

                return std::equal(maEntries.cbegin(), maEntries.cend(),

                                pCompare->maEntries.cbegin(), pCompare->maEntries.cend(),

                                [](const auto& lhs, const auto& rhs) {

                                     return *lhs == *rhs; 

                                });

            }

            return false;

        }

        void AnimationEntryList::append(const AnimationEntry& rCandidate)

        {

            const double fDuration(rCandidate.getDuration());

            if(!basegfx::fTools::equalZero(fDuration))

            {

                maEntries.push_back(rCandidate.clone());

                mfDuration += fDuration;

            }

        }

        double AnimationEntryList::getDuration() const

        {

            return mfDuration;

        }

        double AnimationEntryList::getStateAtTime(double fTime) const

        {

            if(!basegfx::fTools::equalZero(mfDuration))

            {

                double fAddedTime(0.0);

                const auto nIndex(impGetIndexAtTime(fTime, fAddedTime));

                if(nIndex < maEntries.size())

                {

                    return maEntries[nIndex]->getStateAtTime(fTime - fAddedTime);

                }

            }

            return 0.0;

        }

        double AnimationEntryList::getNextEventTime(double fTime) const

        {

            double fNewTime(0.0);

            if(!basegfx::fTools::equalZero(mfDuration))

            {

                double fAddedTime(0.0);

                const auto nIndex(impGetIndexAtTime(fTime, fAddedTime));

                if(nIndex < maEntries.size())

                {

                    fNewTime = maEntries[nIndex]->getNextEventTime(fTime - fAddedTime) + fAddedTime;

                }

            }

            return fNewTime;

        }

        AnimationEntryLoop::AnimationEntryLoop(sal_uInt32 nRepeat)

        :   mnRepeat(nRepeat)

        {

        }

        AnimationEntryLoop::~AnimationEntryLoop()

        {

        }

        std::unique_ptr<AnimationEntry> AnimationEntryLoop::clone() const

        {

            std::unique_ptr<AnimationEntryLoop> pNew(std::make_unique<AnimationEntryLoop>(mnRepeat));

            for(const auto &i : maEntries)

            {

                pNew->append(*i);

            }

            return pNew;

        }

        bool AnimationEntryLoop::operator==(const AnimationEntry& rCandidate) const

        {

            const AnimationEntryLoop* pCompare = dynamic_cast< const AnimationEntryLoop* >(&rCandidate);

            return (pCompare

                && mnRepeat == pCompare->mnRepeat

                && AnimationEntryList::operator==(rCandidate));

        }

        double AnimationEntryLoop::getDuration() const

        {

            return (mfDuration * static_cast<double>(mnRepeat));

        }

        double AnimationEntryLoop::getStateAtTime(double fTime) const

        {

            if(mnRepeat && !basegfx::fTools::equalZero(mfDuration))

            {

                const sal_uInt32 nCurrentLoop(static_cast<sal_uInt32>(fTime / mfDuration));

                if(nCurrentLoop > mnRepeat)

                {

                    return 1.0;

                }

                else

                {

                    const double fTimeAtLoopStart(static_cast<double>(nCurrentLoop) * mfDuration);

                    const double fRelativeTime(fTime - fTimeAtLoopStart);

                    return AnimationEntryList::getStateAtTime(fRelativeTime);

                }

            }

            return 0.0;

        }

        double AnimationEntryLoop::getNextEventTime(double fTime) const

        {

            double fNewTime(0.0);

            if(mnRepeat && !basegfx::fTools::equalZero(mfDuration))

            {

                const sal_uInt32 nCurrentLoop(static_cast<sal_uInt32>(fTime / mfDuration));

                if(nCurrentLoop <= mnRepeat)

                {

                    const double fTimeAtLoopStart(static_cast<double>(nCurrentLoop) * mfDuration);

                    const double fRelativeTime(fTime - fTimeAtLoopStart);

                    const double fNextEventAtLoop(AnimationEntryList::getNextEventTime(fRelativeTime));

                    if(!basegfx::fTools::equalZero(fNextEventAtLoop))

                    {

                        fNewTime = fNextEventAtLoop + fTimeAtLoopStart;

                    }

                }

            }

            return fNewTime;

        }

} // end of namespace

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