#include "animation.hpp"

#include <OgreSkeletonManager.h>
#include <OgreSkeletonInstance.h>
#include <OgreEntity.h>
#include <OgreSubEntity.h>
#include <OgreParticleSystem.h>
#include <OgreBone.h>
#include <OgreSubMesh.h>
#include <OgreSceneManager.h>

#include "../mwbase/environment.hpp"
#include "../mwbase/soundmanager.hpp"
#include "../mwbase/world.hpp"

#include "../mwmechanics/character.hpp"

namespace MWRender
{

Animation::AnimLayer::AnimLayer()
  : mControllers(NULL)
  , mTextKeys(NULL)
  , mTime(0.0f)
  , mPlaying(false)
  , mLooping(false)
{
}


Ogre::Real Animation::AnimationValue::getValue() const
{
    size_t idx = mIndex;
    while(idx > 0 && mAnimation->mLayer[idx].mGroupName.empty())
        idx--;
    if(!mAnimation->mLayer[idx].mGroupName.empty())
        return mAnimation->mLayer[idx].mTime;
    return 0.0f;
}

void Animation::AnimationValue::setValue(Ogre::Real value)
{
    mAnimation->mLayer[mIndex].mTime = value;
}


void Animation::destroyObjectList(Ogre::SceneManager *sceneMgr, NifOgre::ObjectList &objects)
{
    for(size_t i = 0;i < objects.mParticles.size();i++)
        sceneMgr->destroyParticleSystem(objects.mParticles[i]);
    for(size_t i = 0;i < objects.mEntities.size();i++)
        sceneMgr->destroyEntity(objects.mEntities[i]);
    objects.mControllers.clear();
    objects.mCameras.clear();
    objects.mParticles.clear();
    objects.mEntities.clear();
    objects.mSkelBase = NULL;
}

Animation::Animation(const MWWorld::Ptr &ptr)
    : mAnimationBaseValuePtr(OGRE_NEW AnimationValue(this, 0))
    , mPtr(ptr)
    , mController(NULL)
    , mInsert(NULL)
    , mSkelBase(NULL)
    , mAccumRoot(NULL)
    , mNonAccumRoot(NULL)
    , mAccumulate(0.0f)
    , mLastPosition(0.0f)
    , mNonAccumCtrl(NULL)
    , mAnimVelocity(0.0f)
    , mAnimSpeedMult(1.0f)
{
}

Animation::~Animation()
{
    if(mInsert)
    {
        Ogre::SceneManager *sceneMgr = mInsert->getCreator();
        for(size_t i = 0;i < mObjects.size();i++)
            destroyObjectList(sceneMgr, mObjects[i].mObjectList);
        mObjects.clear();
    }
}


void Animation::addObjectList(Ogre::SceneNode *node, const std::string &model, bool baseonly)
{
    if(!mInsert)
    {
        mInsert = node->createChildSceneNode();
        assert(mInsert);
    }

    mObjects.push_back(ObjectInfo());
    ObjectInfo &obj = mObjects.back();
    obj.mActiveLayers = 0;
    obj.mObjectList = (!baseonly ? NifOgre::Loader::createObjects(mInsert, model) :
                                   NifOgre::Loader::createObjectBase(mInsert, model));

    NifOgre::ObjectList &objlist = obj.mObjectList;
    if(objlist.mSkelBase)
    {
        if(!mSkelBase)
            mSkelBase = objlist.mSkelBase;

        Ogre::AnimationStateSet *aset = objlist.mSkelBase->getAllAnimationStates();
        Ogre::AnimationStateIterator asiter = aset->getAnimationStateIterator();
        while(asiter.hasMoreElements())
        {
            Ogre::AnimationState *state = asiter.getNext();
            state->setEnabled(false);
            state->setLoop(false);
        }

        // Set the bones as manually controlled since we're applying the
        // transformations manually (needed if we want to apply an animation
        // from one skeleton onto another).
        Ogre::SkeletonInstance *skelinst = objlist.mSkelBase->getSkeleton();
        Ogre::Skeleton::BoneIterator boneiter = skelinst->getBoneIterator();
        while(boneiter.hasMoreElements())
            boneiter.getNext()->setManuallyControlled(true);

        Ogre::SkeletonInstance *baseinst = mSkelBase->getSkeleton();
        if(mSkelBase == objlist.mSkelBase)
        {
            if(objlist.mTextKeys.size() > 0)
            {
                mAccumRoot = mInsert;
                mNonAccumRoot = baseinst->getBone(objlist.mTextKeys.begin()->first);
            }
        }
        else
        {
            for(size_t i = 0;i < objlist.mControllers.size();i++)
            {
                NifOgre::NodeTargetValue<Ogre::Real> *dstval;
                dstval = dynamic_cast<NifOgre::NodeTargetValue<Ogre::Real>*>(objlist.mControllers[i].getDestination().getPointer());
                if(!dstval) continue;

                const Ogre::String &trgtname = dstval->getNode()->getName();
                if(!baseinst->hasBone(trgtname)) continue;

                Ogre::Bone *bone = baseinst->getBone(trgtname);
                dstval->setNode(bone);
            }
        }
    }
    for(size_t i = 0;i < objlist.mControllers.size();i++)
    {
        if(objlist.mControllers[i].getSource().isNull())
            objlist.mControllers[i].setSource(mAnimationBaseValuePtr);
    }
}

void Animation::setRenderProperties(const NifOgre::ObjectList &objlist, Ogre::uint32 visflags, Ogre::uint8 solidqueue, Ogre::uint8 transqueue)
{
    for(size_t i = 0;i < objlist.mEntities.size();i++)
    {
        Ogre::Entity *ent = objlist.mEntities[i];
        if(visflags != 0)
            ent->setVisibilityFlags(visflags);

        for(unsigned int j = 0;j < ent->getNumSubEntities();++j)
        {
            Ogre::SubEntity* subEnt = ent->getSubEntity(j);
            subEnt->setRenderQueueGroup(subEnt->getMaterial()->isTransparent() ? transqueue : solidqueue);
        }
    }
    for(size_t i = 0;i < objlist.mParticles.size();i++)
    {
        Ogre::ParticleSystem *part = objlist.mParticles[i];
        if(visflags != 0)
            part->setVisibilityFlags(visflags);
        // TODO: Check particle material for actual transparency
        part->setRenderQueueGroup(transqueue);
    }
}


Ogre::Node *Animation::getNode(const std::string &name)
{
    if(mSkelBase)
    {
        Ogre::SkeletonInstance *skel = mSkelBase->getSkeleton();
        if(skel->hasBone(name))
            return skel->getBone(name);
    }
    return NULL;
}


NifOgre::TextKeyMap::const_iterator Animation::findGroupStart(const NifOgre::TextKeyMap &keys, const std::string &groupname)
{
    NifOgre::TextKeyMap::const_iterator iter(keys.begin());
    for(;iter != keys.end();iter++)
    {
        if(iter->second.compare(0, groupname.size(), groupname) == 0 &&
           iter->second.compare(groupname.size(), 2, ": ") == 0)
            break;
    }
    return iter;
}


bool Animation::hasAnimation(const std::string &anim)
{
    for(std::vector<ObjectInfo>::const_iterator iter(mObjects.begin());iter != mObjects.end();iter++)
    {
        if(iter->mObjectList.mTextKeys.size() == 0)
            continue;

        const NifOgre::TextKeyMap &keys = iter->mObjectList.mTextKeys.begin()->second;
        if(findGroupStart(keys, anim) != keys.end())
            return true;
    }
    return false;
}


void Animation::setController(MWMechanics::CharacterController *controller)
{
    mController = controller;
}


void Animation::setAccumulation(const Ogre::Vector3 &accum)
{
    mAccumulate = accum;
}

void Animation::setSpeed(float speed)
{
    mAnimSpeedMult = 1.0f;
    if(mAnimVelocity > 1.0f && speed > 0.0f)
        mAnimSpeedMult = speed / mAnimVelocity;
}


void Animation::updatePtr(const MWWorld::Ptr &ptr)
{
    mPtr = ptr;
}


float Animation::calcAnimVelocity(const NifOgre::TextKeyMap &keys, NifOgre::NodeTargetValue<Ogre::Real> *nonaccumctrl, const std::string &groupname)
{
    const std::string start = groupname+": start";
    const std::string loopstart = groupname+": loop start";
    const std::string loopstop = groupname+": loop stop";
    const std::string stop = groupname+": stop";
    float starttime = std::numeric_limits<float>::max();
    float stoptime = 0.0f;
    NifOgre::TextKeyMap::const_iterator keyiter(keys.begin());
    while(keyiter != keys.end())
    {
        if(keyiter->second == start || keyiter->second == loopstart)
            starttime = keyiter->first;
        else if(keyiter->second == loopstop || keyiter->second == stop)
        {
            stoptime = keyiter->first;
            break;
        }
        keyiter++;
    }

    if(stoptime > starttime)
    {
        Ogre::Vector3 startpos = nonaccumctrl->getTranslation(starttime);
        Ogre::Vector3 endpos = nonaccumctrl->getTranslation(stoptime);

        return startpos.distance(endpos) / (stoptime-starttime);
    }

    return 0.0f;
}

static void updateBoneTree(const Ogre::SkeletonInstance *skelsrc, Ogre::Bone *bone)
{
    if(skelsrc->hasBone(bone->getName()))
    {
        Ogre::Bone *srcbone = skelsrc->getBone(bone->getName());
        if(!srcbone->getParent() || !bone->getParent())
        {
            bone->setOrientation(srcbone->getOrientation());
            bone->setPosition(srcbone->getPosition());
            bone->setScale(srcbone->getScale());
        }
        else
        {
            bone->_setDerivedOrientation(srcbone->_getDerivedOrientation());
            bone->_setDerivedPosition(srcbone->_getDerivedPosition());
            bone->setScale(Ogre::Vector3::UNIT_SCALE);
        }
    }
    else
    {
        // No matching bone in the source. Make sure it stays properly offset
        // from its parent.
        bone->resetToInitialState();
    }

    Ogre::Node::ChildNodeIterator boneiter = bone->getChildIterator();
    while(boneiter.hasMoreElements())
        updateBoneTree(skelsrc, static_cast<Ogre::Bone*>(boneiter.getNext()));
}

void Animation::updateSkeletonInstance(const Ogre::SkeletonInstance *skelsrc, Ogre::SkeletonInstance *skel)
{
    Ogre::Skeleton::BoneIterator boneiter = skel->getRootBoneIterator();
    while(boneiter.hasMoreElements())
        updateBoneTree(skelsrc, boneiter.getNext());
}


Ogre::Vector3 Animation::updatePosition()
{
    Ogre::Vector3 posdiff;

    /* Get the non-accumulation root's difference from the last update. */
    posdiff = (mNonAccumCtrl->getTranslation(mLayer[0].mTime) - mLastPosition) * mAccumulate;

    /* Translate the accumulation root back to compensate for the move. */
    mLastPosition += posdiff;
    mAccumRoot->setPosition(-mLastPosition);

    return posdiff;
}

bool Animation::reset(size_t layeridx, const NifOgre::TextKeyMap &keys, NifOgre::NodeTargetValue<Ogre::Real> *nonaccumctrl, const std::string &groupname, const std::string &start, const std::string &stop)
{
    std::string tag = groupname+": "+start;
    NifOgre::TextKeyMap::const_iterator startkey(keys.begin());
    while(startkey != keys.end() && startkey->second != tag)
        startkey++;
    if(startkey == keys.end() && tag == "loop start")
    {
        tag = groupname+": start";
        startkey = keys.begin();
        while(startkey != keys.end() && startkey->second != tag)
            startkey++;
    }
    if(startkey == keys.end())
        return false;

    tag = groupname+": "+stop;
    NifOgre::TextKeyMap::const_iterator stopkey(startkey);
    while(stopkey != keys.end() && stopkey->second != tag)
        stopkey++;
    if(stopkey == keys.end())
        return false;

    if(startkey == stopkey)
        return false;

    mLayer[layeridx].mStartKey = startkey;
    mLayer[layeridx].mLoopStartKey = startkey;
    mLayer[layeridx].mStopKey = stopkey;
    mLayer[layeridx].mNextKey = startkey;
    mLayer[layeridx].mNextKey++;

    mLayer[layeridx].mTime = mLayer[layeridx].mStartKey->first;

    if(layeridx == 0 && nonaccumctrl)
        mLastPosition = nonaccumctrl->getTranslation(mLayer[layeridx].mTime) * mAccumulate;

    return true;
}

void Animation::doLoop(size_t layeridx)
{
    mLayer[layeridx].mTime = mLayer[layeridx].mLoopStartKey->first;
    mLayer[layeridx].mNextKey = mLayer[layeridx].mLoopStartKey;
    mLayer[layeridx].mNextKey++;
    if(layeridx == 0 && mNonAccumCtrl)
        mLastPosition = mNonAccumCtrl->getTranslation(mLayer[layeridx].mTime) * mAccumulate;
}


bool Animation::handleTextKey(size_t layeridx, const NifOgre::TextKeyMap::const_iterator &key)
{
    float time = key->first;
    const std::string &evt = key->second;

    if(evt.compare(0, 7, "sound: ") == 0)
    {
        MWBase::SoundManager *sndMgr = MWBase::Environment::get().getSoundManager();
        sndMgr->playSound3D(mPtr, evt.substr(7), 1.0f, 1.0f);
        return true;
    }
    if(evt.compare(0, 10, "soundgen: ") == 0)
    {
        // FIXME: Lookup the SoundGen (SNDG) for the specified sound that corresponds
        // to this actor type
        return true;
    }

    if(evt.compare(0, mLayer[layeridx].mGroupName.size(), mLayer[layeridx].mGroupName) != 0 ||
       evt.compare(mLayer[layeridx].mGroupName.size(), 2, ": ") != 0)
    {
        // Not ours, skip it
        return true;
    }
    size_t off = mLayer[layeridx].mGroupName.size()+2;
    size_t len = evt.size() - off;

    if(evt.compare(off, len, "start") == 0 || evt.compare(off, len, "loop start") == 0)
    {
        mLayer[layeridx].mLoopStartKey = key;
        return true;
    }

    if(evt.compare(off, len, "loop stop") == 0 || evt.compare(off, len, "stop") == 0)
    {
        if(mLayer[layeridx].mLooping)
        {
            doLoop(layeridx);
            if(mLayer[layeridx].mTime >= time)
                return false;
            return true;
        }
        // fall-through
    }
    if(mController)
        mController->markerEvent(time, evt.substr(off));
    return true;
}


void Animation::play(const std::string &groupname, const std::string &start, const std::string &stop, bool loop)
{
    // TODO: parameterize this
    size_t layeridx = 0;

    try {
        for(std::vector<ObjectInfo>::iterator iter(mObjects.begin());iter != mObjects.end();iter++)
            iter->mActiveLayers &= ~(1<<layeridx);

        if(groupname.empty())
        {
            // Do not allow layer 0 to be disabled
            assert(layeridx != 0);

            mLayer[layeridx].mGroupName.clear();
            mLayer[layeridx].mTextKeys = NULL;
            mLayer[layeridx].mControllers = NULL;
            mLayer[layeridx].mLooping = false;
            mLayer[layeridx].mPlaying = false;

            if(layeridx == 0)
            {
                mNonAccumCtrl = NULL;
                mAnimVelocity = 0.0f;
            }

            return;
        }

        bool foundanim = false;
        /* Look in reverse; last-inserted source has priority. */
        for(std::vector<ObjectInfo>::reverse_iterator iter(mObjects.rbegin());iter != mObjects.rend();iter++)
        {
            NifOgre::ObjectList &objlist = iter->mObjectList;
            if(objlist.mTextKeys.size() == 0)
                continue;

            const NifOgre::TextKeyMap &keys = objlist.mTextKeys.begin()->second;
            NifOgre::NodeTargetValue<Ogre::Real> *nonaccumctrl = NULL;
            if(layeridx == 0)
            {
                for(size_t i = 0;i < objlist.mControllers.size();i++)
                {
                    NifOgre::NodeTargetValue<Ogre::Real> *dstval;
                    dstval = dynamic_cast<NifOgre::NodeTargetValue<Ogre::Real>*>(objlist.mControllers[i].getDestination().getPointer());
                    if(dstval && dstval->getNode() == mNonAccumRoot)
                    {
                        nonaccumctrl = dstval;
                        break;
                    }
                }
            }

            if(!foundanim)
            {
                if(!reset(layeridx, keys, nonaccumctrl, groupname, start, stop))
                    continue;
                mLayer[layeridx].mGroupName = groupname;
                mLayer[layeridx].mTextKeys = &keys;
                mLayer[layeridx].mControllers = &objlist.mControllers;
                mLayer[layeridx].mLooping = loop;
                mLayer[layeridx].mPlaying = true;

                if(layeridx == 0)
                {
                    mNonAccumCtrl = nonaccumctrl;
                    mAnimVelocity = 0.0f;
                }

                iter->mActiveLayers |= (1<<layeridx);
                foundanim = true;
            }

            if(!nonaccumctrl)
                break;

            mAnimVelocity = calcAnimVelocity(keys, nonaccumctrl, groupname);
            if(mAnimVelocity > 0.0f) break;
        }
        if(!foundanim)
            throw std::runtime_error("Failed to find animation "+groupname);
    }
    catch(std::exception &e) {
        std::cerr<< e.what() <<std::endl;
    }
}

Ogre::Vector3 Animation::runAnimation(float duration)
{
    Ogre::Vector3 movement(0.0f);

    duration *= mAnimSpeedMult;
    for(size_t layeridx = 0;layeridx < sMaxLayers;layeridx++)
    {
        if(mLayer[layeridx].mGroupName.empty())
            continue;

        float timepassed = duration;
        while(mLayer[layeridx].mPlaying)
        {
            float targetTime = mLayer[layeridx].mTime + timepassed;
            if(mLayer[layeridx].mNextKey->first > targetTime)
            {
                mLayer[layeridx].mTime = targetTime;
                if(layeridx == 0 && mNonAccumRoot)
                    movement += updatePosition();
                break;
            }

            NifOgre::TextKeyMap::const_iterator key(mLayer[layeridx].mNextKey++);
            mLayer[layeridx].mTime = key->first;
            if(layeridx == 0 && mNonAccumRoot)
                movement += updatePosition();

            mLayer[layeridx].mPlaying = (mLayer[layeridx].mLooping || mLayer[layeridx].mStopKey->first > mLayer[layeridx].mTime);
            timepassed = targetTime - mLayer[layeridx].mTime;

            if(!handleTextKey(layeridx, key))
                break;
        }

        bool updatectrls = true;
        for(size_t i = layeridx-1;i < layeridx;i--)
        {
            if(mLayer[i].mGroupName.empty())
                continue;
            if(mLayer[i].mControllers == mLayer[layeridx].mControllers)
            {
                updatectrls = false;
                break;
            }
        }
        if(updatectrls)
        {
            for(size_t i = 0;i < (*(mLayer[layeridx].mControllers)).size();i++)
                (*(mLayer[layeridx].mControllers))[i].update();
        }
    }

    if(mSkelBase)
    {
        const Ogre::SkeletonInstance *baseinst = mSkelBase->getSkeleton();
        for(std::vector<ObjectInfo>::iterator iter(mObjects.begin());iter != mObjects.end();iter++)
        {
            Ogre::Entity *ent = iter->mObjectList.mSkelBase;
            if(!ent) continue;

            Ogre::SkeletonInstance *inst = ent->getSkeleton();
            if(baseinst != inst)
                updateSkeletonInstance(baseinst, inst);

            // HACK: Dirty the animation state set so that Ogre will apply the
            // transformations to entities this skeleton instance is shared with.
            ent->getAllAnimationStates()->_notifyDirty();
        }
    }

    return movement;
}

}