#include "CModVectorElement.hpp"
#include "CParticleGlobals.hpp"
#include "CRandom16.hpp"
#include "zeus/Math.hpp"

/* Documentation at: http://www.metroid2002.com/retromodding/wiki/Particle_Script#Mod_Vector_Elements */

namespace urde {

bool CMVEImplosion::GetValue(int frame, zeus::CVector3f& pVel, zeus::CVector3f& pPos) const {
  zeus::CVector3f av;
  x4_implPoint->GetValue(frame, av);

  zeus::CVector3f dv = av - pPos;
  float dvm = dv.magnitude();

  float c;
  xc_maxMag->GetValue(frame, c);
  if (dvm > c)
    return false;

  float d;
  x10_minMag->GetValue(frame, d);
  if (x14_enableMinMag && dvm < d)
    return true;

  if (0.f == dvm)
    return false;

  float b;
  x8_magScale->GetValue(frame, b);
  pVel += zeus::CVector3f(b / dvm) * dv;
  return false;
}

bool CMVEExponentialImplosion::GetValue(int frame, zeus::CVector3f& pVel, zeus::CVector3f& pPos) const {
  zeus::CVector3f av;
  x4_implPoint->GetValue(frame, av);

  zeus::CVector3f dv = av - pPos;
  float dvm = dv.magnitude();

  float c;
  xc_maxMag->GetValue(frame, c);
  if (dvm > c)
    return false;

  float d;
  x10_minMag->GetValue(frame, d);
  if (x14_enableMinMag && dvm < d)
    return true;

  if (0.f == dvm)
    return false;

  float b;
  x8_magScale->GetValue(frame, b);
  pVel += zeus::CVector3f(b) * dv;
  return false;
}

bool CMVELinearImplosion::GetValue(int frame, zeus::CVector3f& pVel, zeus::CVector3f& pPos) const {
  zeus::CVector3f av;
  x4_implPoint->GetValue(frame, av);

  zeus::CVector3f dv = av - pPos;
  float dvm = dv.magnitude();

  float c;
  xc_maxMag->GetValue(frame, c);
  if (dvm > c)
    return false;

  float d;
  x10_minMag->GetValue(frame, d);
  if (x14_enableMinMag && dvm < d)
    return true;

  if (0.f == dvm)
    return false;

  float b;
  x8_magScale->GetValue(frame, b);
  pVel = zeus::CVector3f(b / dvm) * dv;
  return false;
}

bool CMVETimeChain::GetValue(int frame, zeus::CVector3f& pVel, zeus::CVector3f& pPos) const {
  int v;
  xc_swFrame->GetValue(frame, v);
  if (frame >= v)
    return x8_b->GetValue(frame, pVel, pPos);
  else
    return x4_a->GetValue(frame, pVel, pPos);
}

CMVEBounce::CMVEBounce(std::unique_ptr<CVectorElement>&& a, std::unique_ptr<CVectorElement>&& b,
                       std::unique_ptr<CRealElement>&& c, std::unique_ptr<CRealElement>&& d, bool e)
: x4_planePoint(std::move(a))
, x8_planeNormal(std::move(b))
, xc_friction(std::move(c))
, x10_restitution(std::move(d))
, x14_planePrecomputed(false)
, x15_dieOnPenetrate(e)
, x24_planeD(0.0) {
  if (x4_planePoint && x8_planeNormal && x4_planePoint->IsFastConstant() && x8_planeNormal->IsFastConstant()) {
    /* Precompute Hesse normal form of plane (for penetration testing)
     * https://en.wikipedia.org/wiki/Hesse_normal_form */
    x14_planePrecomputed = true;
    x8_planeNormal->GetValue(0, x18_planeValidatedNormal);

    if (x18_planeValidatedNormal.magSquared() > 0.0)
      x18_planeValidatedNormal.normalize();
    zeus::CVector3f a;
    x4_planePoint->GetValue(0, a);
    x24_planeD = x18_planeValidatedNormal.dot(a);
  }
}

bool CMVEBounce::GetValue(int frame, zeus::CVector3f& pVel, zeus::CVector3f& pPos) const {
  if (!x14_planePrecomputed) {
    /* Compute Hesse normal form of plane (for penetration testing) */
    x8_planeNormal->GetValue(frame, const_cast<zeus::CVector3f&>(x18_planeValidatedNormal));
    const_cast<zeus::CVector3f&>(x18_planeValidatedNormal).normalize();

    zeus::CVector3f a;
    x4_planePoint->GetValue(frame, a);

    const_cast<float&>(x24_planeD) = x18_planeValidatedNormal.dot(a);
  }

  float dot = x18_planeValidatedNormal.dot(pPos);
  if (dot - x24_planeD > 0.0f)
    return false;
  else if (x15_dieOnPenetrate)
    return true;

  /* Deflection event */

  if (pVel.dot(x18_planeValidatedNormal) >= 0.0f)
    return false;

  zeus::CVector3f delta = pPos - pVel;
  pPos += (-(delta.dot(x18_planeValidatedNormal) - x24_planeD) / pVel.dot(x18_planeValidatedNormal) - 1.f) * pVel;

  float d = 0.0f;
  x10_restitution->GetValue(frame, d);
  pVel -= d * pVel;

  float c = 0.0f;
  xc_friction->GetValue(frame, c);
  pVel -= (1.f + c) * x18_planeValidatedNormal.dot(pVel) * x18_planeValidatedNormal;
  return false;
}

bool CMVEConstant::GetValue(int frame, zeus::CVector3f& pVel, zeus::CVector3f& /*pPos*/) const {
  float x, y, z;
  x4_x->GetValue(frame, x);
  x8_y->GetValue(frame, y);
  xc_z->GetValue(frame, z);
  pVel.assign(x, y, z);
  return false;
}

bool CMVEFastConstant::GetValue(int /*frame*/, zeus::CVector3f& pVel, zeus::CVector3f& /*pPos*/) const {
  pVel = x4_val;
  return false;
}

bool CMVEGravity::GetValue(int frame, zeus::CVector3f& pVel, zeus::CVector3f& /*pPos*/) const {
  zeus::CVector3f grav;
  x4_a->GetValue(frame, grav);
  pVel += grav;
  return false;
}

bool CMVEExplode::GetValue(int frame, zeus::CVector3f& pVel, zeus::CVector3f& /*pPos*/) const {
  if (frame == 0) {
    CRandom16* rand = CRandom16::GetRandomNumber();
    zeus::CVector3f vec = {rand->Float() - 0.5f, rand->Float() - 0.5f, rand->Float() - 0.5f};
    vec.normalize();
    float a;
    x4_a->GetValue(frame, a);
    pVel = vec * a;
  } else {
    float b;
    x8_b->GetValue(frame, b);
    pVel *= zeus::CVector3f(b);
  }

  return false;
}

bool CMVESetPosition::GetValue(int frame, zeus::CVector3f& /*pVel*/, zeus::CVector3f& pPos) const {
  x4_a->GetValue(frame, pPos);
  return false;
}

bool CMVEPulse::GetValue(int frame, zeus::CVector3f& pVel, zeus::CVector3f& pPos) const {
  int a, b;
  x4_aDuration->GetValue(frame, a);
  x8_bDuration->GetValue(frame, b);
  int cv = std::max(1, a + b + 1);

  if (b >= 1) {
    int cv2 = frame % cv;
    if (cv2 >= a)
      x10_bVal->GetValue(frame, pVel, pPos);
    else
      xc_aVal->GetValue(frame, pVel, pPos);
  } else
    xc_aVal->GetValue(frame, pVel, pPos);

  return false;
}

bool CMVEWind::GetValue(int frame, zeus::CVector3f& pVel, zeus::CVector3f& /*pPos*/) const {
  zeus::CVector3f wVel;
  x4_velocity->GetValue(frame, wVel);
  float factor;
  x8_factor->GetValue(frame, factor);
  pVel += (wVel - pVel) * factor;
  return false;
}

bool CMVESwirl::GetValue(int frame, zeus::CVector3f& pVel, zeus::CVector3f& pPos) const {
  zeus::CVector3f a, b;
  x4_helixPoint->GetValue(frame, a);
  x8_curveBinormal->GetValue(frame, b);

  const zeus::CVector3f posToOrigin = a - pPos;
  const zeus::CVector3f posToHelix = posToOrigin - posToOrigin.dot(b) * b;
  float c = 0.0f, d = 0.0f;
  xc_filterGain->GetValue(frame, c);
  x10_tangentialVelocity->GetValue(frame, d);
  const zeus::CVector3f wetVel = (posToHelix.cross(b) * d + b * b.dot(pVel));
  pVel = c * wetVel + (1.f - c) * pVel;
  return false;
}

} // namespace urde