#include "Runtime/Character/CAdditiveAnimPlayback.hpp"

#include "Runtime/Character/CAnimTreeNode.hpp"
#include "Runtime/Character/CCharLayoutInfo.hpp"
#include "Runtime/Character/CSegStatementSet.hpp"

namespace metaforce {

CAdditiveAnimPlayback::CAdditiveAnimPlayback(const std::weak_ptr<CAnimTreeNode>& anim, float weight, bool active,
                                             const CAdditiveAnimationInfo& info, bool fadeOut)
: x0_info(info), x8_anim(anim.lock()), xc_targetWeight(weight), x14_active(active) {
  if (!active && fadeOut)
    x20_needsFadeOut = true;
}

void CAdditiveAnimPlayback::AddToSegStatementSet(const CSegIdList& list, const CCharLayoutInfo& layout,
                                                 CSegStatementSet& setOut) const {
  CSegStatementSet stackSet;
  x8_anim->VGetSegStatementSet(list, stackSet);
  for (const CSegId& id : list.GetList()) {
    CAnimPerSegmentData& data = stackSet[id];
    data.x10_offset = layout.GetFromParentUnrotated(id);
    data.x1c_hasOffset = true;
  }
  setOut.Add(list, layout, stackSet, x10_curWeight);
}

void CAdditiveAnimPlayback::Update(float dt) {
  switch (x1c_phase) {
  case EAdditivePlaybackPhase::FadingIn: {
    float a = x0_info.GetFadeInDuration();
    float b = x18_weightTimer + dt;
    x18_weightTimer = std::min(b, a);
    if (a > 0.f)
      x10_curWeight = x18_weightTimer / a * xc_targetWeight;
    else
      x10_curWeight = xc_targetWeight;

    if (std::fabs(x10_curWeight - xc_targetWeight) < 0.00001f)
      x1c_phase = EAdditivePlaybackPhase::FadedIn;

    break;
  }
  case EAdditivePlaybackPhase::FadingOut: {
    float a = x18_weightTimer - dt;
    x18_weightTimer = std::max(a, 0.f);
    if (x0_info.GetFadeOutDuration() > 0.f)
      x10_curWeight = x18_weightTimer / x0_info.GetFadeOutDuration() * xc_targetWeight;
    else
      x10_curWeight = 0.f;

    if (std::fabs(x10_curWeight) < 0.00001f)
      x1c_phase = EAdditivePlaybackPhase::FadedOut;
    break;
  }
  default:
    break;
  }
}

void CAdditiveAnimPlayback::FadeOut() {
  switch (x1c_phase) {
  case EAdditivePlaybackPhase::FadedOut:
  case EAdditivePlaybackPhase::FadedIn:
    x18_weightTimer = x0_info.GetFadeOutDuration();
    break;
  case EAdditivePlaybackPhase::FadingIn:
    x18_weightTimer = x18_weightTimer / x0_info.GetFadeInDuration() * x0_info.GetFadeOutDuration();
    break;
  default:
    break;
  }

  if (x0_info.GetFadeOutDuration() > 0.f)
    x1c_phase = EAdditivePlaybackPhase::FadingOut;
  else
    x1c_phase = EAdditivePlaybackPhase::FadedOut;
  x10_curWeight = 0.f;
}

void CAdditiveAnimPlayback::SetWeight(float w) {
  xc_targetWeight = w;
  switch (x1c_phase) {
  case EAdditivePlaybackPhase::FadingIn: {
    if (x0_info.GetFadeInDuration() > 0.f)
      x10_curWeight = x18_weightTimer / x0_info.GetFadeInDuration() * xc_targetWeight;
    else
      x10_curWeight = xc_targetWeight;
    break;
  }
  case EAdditivePlaybackPhase::FadingOut: {
    if (x0_info.GetFadeOutDuration() > 0.f)
      x10_curWeight = x18_weightTimer / x0_info.GetFadeOutDuration() * xc_targetWeight;
    else
      x10_curWeight = xc_targetWeight;
    break;
  }
  default:
    x10_curWeight = xc_targetWeight;
    break;
  }
}

} // namespace metaforce