#include "Runtime/Character/CAnimTreeTransition.hpp"

namespace metaforce {

std::string CAnimTreeTransition::CreatePrimitiveName(const std::weak_ptr<CAnimTreeNode>&,
                                                     const std::weak_ptr<CAnimTreeNode>&, float) {
  return {};
}

CAnimTreeTransition::CAnimTreeTransition(bool b1, const std::weak_ptr<CAnimTreeNode>& a,
                                         const std::weak_ptr<CAnimTreeNode>& b, const CCharAnimTime& transDur,
                                         const CCharAnimTime& timeInTrans, bool runA, bool loopA, int flags,
                                         std::string_view name, bool initialized)
: CAnimTreeTweenBase(b1, a, b, flags, name)
, x24_transDur(transDur)
, x2c_timeInTrans(timeInTrans)
, x34_runA(runA)
, x35_loopA(loopA)
, x36_initialized(initialized) {}

CAnimTreeTransition::CAnimTreeTransition(bool b1, const std::weak_ptr<CAnimTreeNode>& a,
                                         const std::weak_ptr<CAnimTreeNode>& b, const CCharAnimTime& transDur,
                                         bool runA, int flags, std::string_view name)
: CAnimTreeTweenBase(b1, a, b, flags, name)
, x24_transDur(transDur)
, x34_runA(runA)
, x35_loopA(a.lock()->VGetBoolPOIState("Loop")) {}

std::shared_ptr<IAnimReader> CAnimTreeTransition::VGetBestUnblendedChild() const {
  std::shared_ptr<IAnimReader> child = x18_b->GetBestUnblendedChild();
  return (child ? child : x18_b);
}

CCharAnimTime CAnimTreeTransition::VGetTimeRemaining() const {
  CCharAnimTime transTimeRem = x24_transDur - x2c_timeInTrans;
  CCharAnimTime rightTimeRem = x18_b->VGetTimeRemaining();
  return (rightTimeRem < transTimeRem) ? transTimeRem : rightTimeRem;
}

CSteadyStateAnimInfo CAnimTreeTransition::VGetSteadyStateAnimInfo() const {
  CSteadyStateAnimInfo bInfo = x18_b->VGetSteadyStateAnimInfo();

  if (x24_transDur < bInfo.GetDuration())
    return CSteadyStateAnimInfo(bInfo.IsLooping(), bInfo.GetDuration(), bInfo.GetOffset());
  return CSteadyStateAnimInfo(bInfo.IsLooping(), x24_transDur, bInfo.GetOffset());
}

std::unique_ptr<IAnimReader> CAnimTreeTransition::VClone() const {
  return std::make_unique<CAnimTreeTransition>(
      x20_24_b1, std::static_pointer_cast<CAnimTreeNode>(std::shared_ptr<IAnimReader>(x14_a->Clone())),
      std::static_pointer_cast<CAnimTreeNode>(std::shared_ptr<IAnimReader>(x18_b->Clone())), x24_transDur,
      x2c_timeInTrans, x34_runA, x35_loopA, x1c_flags, x4_name, x36_initialized);
}

std::optional<std::unique_ptr<IAnimReader>> CAnimTreeTransition::VSimplified() {
  if (zeus::close_enough(GetBlendingWeight(), 1.f)) {
    if (auto simp = x18_b->Simplified())
      return simp;
    return {x18_b->Clone()};
  }
  return CAnimTreeTweenBase::VSimplified();
}

std::optional<std::unique_ptr<IAnimReader>> CAnimTreeTransition::VReverseSimplified() {
  if (zeus::close_enough(GetBlendingWeight(), 0.f))
    return {x14_a->Clone()};
  return CAnimTreeTweenBase::VReverseSimplified();
}

SAdvancementResults CAnimTreeTransition::AdvanceViewForTransitionalPeriod(const CCharAnimTime& time) {
  IncAdvancementDepth();
  CDoubleChildAdvancementResult res = AdvanceViewBothChildren(time, x34_runA, x35_loopA);
  DecAdvancementDepth();
  if (res.GetTrueAdvancement().EqualsZero())
    return {};

  float oldWeight = GetBlendingWeight();
  x2c_timeInTrans += res.GetTrueAdvancement();
  float newWeight = GetBlendingWeight();

  if (ShouldCullTree()) {
    if (newWeight < 0.5f)
      x20_25_cullSelector = 1;
    else
      x20_25_cullSelector = 2;
  }

  if (x1c_flags & 0x1) {
    return {res.GetTrueAdvancement(),
            SAdvancementDeltas::Interpolate(res.GetLeftAdvancementDeltas(), res.GetRightAdvancementDeltas(), oldWeight,
                                            newWeight)};
  }

  return {res.GetTrueAdvancement(), res.GetRightAdvancementDeltas()};
}

SAdvancementResults CAnimTreeTransition::VAdvanceView(const CCharAnimTime& time) {
  if (time.EqualsZero()) {
    IncAdvancementDepth();
    x18_b->VAdvanceView(time);
    if (x34_runA)
      x14_a->VAdvanceView(time);
    DecAdvancementDepth();
    if (ShouldCullTree())
      x20_25_cullSelector = 1;
    return {};
  }

  if (!x36_initialized)
    x36_initialized = true;

  if (x2c_timeInTrans + time < x24_transDur) {
    SAdvancementResults res = AdvanceViewForTransitionalPeriod(time);
    res.x0_remTime = time - res.x0_remTime;
    return res;
  }

  CCharAnimTime transTimeRem = x24_transDur - x2c_timeInTrans;
  SAdvancementResults res;
  if (transTimeRem.GreaterThanZero()) {
    res = AdvanceViewForTransitionalPeriod(transTimeRem);
    if (res.x0_remTime != transTimeRem)
      return res;

    // NOTE: URDE can hit an infinite loop if transTimeRem
    // becomes negative (floating point inaccuracy).
    // This line was moved into this branch as a workaround.
    res.x0_remTime = time - transTimeRem;
  }

  return res;
}

void CAnimTreeTransition::SetBlendingWeight(float w) {
  std::static_pointer_cast<CAnimTreeTweenBase>(x18_b)->SetBlendingWeight(w);
}

float CAnimTreeTransition::VGetBlendingWeight() const {
  if (x24_transDur.GreaterThanZero())
    return x2c_timeInTrans.GetSeconds() / x24_transDur.GetSeconds();
  return 0.f;
}
} // namespace metaforce