#include "iwa_corridorgradientfx.h"

#include "trop.h"

#include "tparamuiconcept.h"

#include "tspectrumparam.h"

#include "gradients.h"

#include <qpolygonf></qpolygonf>

#include <array></array>

#include <algorithm></algorithm>

//------------------------------------------------------------

Iwa_CorridorGradientFx::Iwa_CorridorGradientFx()

    : m_shape(new TIntEnumParam(0, "Quadrangle"))

    , m_innerColor(TPixel32::White)

    , m_outerColor(TPixel32::Black)

    , m_curveType(new TIntEnumParam()) {

  for (int inout = 0; inout < 2; inout++) {

    double size           = (inout == 0) ? 50. : 400.;

    std::string inout_str = (inout == 0) ? "_in" : "_out";

    for (int c = 0; c < 4; c++) {

      Qt::Corner corner = (Qt::Corner)c;

      TPointD basePos(1, 1);

      if (corner == Qt::TopLeftCorner || corner == Qt::BottomLeftCorner)

        basePos.x *= -1;

      if (corner == Qt::BottomLeftCorner || corner == Qt::BottomRightCorner)

        basePos.y *= -1;

      m_points[inout][corner] = basePos * size;

      m_points[inout][corner]->getX()->setMeasureName("fxLength");

      m_points[inout][corner]->getY()->setMeasureName("fxLength");

      std::string TB_str =

          (corner == Qt::TopLeftCorner || corner == Qt::TopRightCorner)

              ? "top"

              : "bottom";

      std::string LR_str =

          (corner == Qt::TopLeftCorner || corner == Qt::BottomLeftCorner)

              ? "_left"

              : "_right";

      bindParam(this, TB_str + LR_str + inout_str, m_points[inout][corner]);

    }

  }

  m_shape->addItem(1, "Circle");

  bindParam(this, "shape", m_shape);

  m_curveType->addItem(EaseInOut, "Ease In-Out");

  m_curveType->addItem(Linear, "Linear");

  m_curveType->addItem(EaseIn, "Ease In");

  m_curveType->addItem(EaseOut, "Ease Out");

  m_curveType->setDefaultValue(Linear);

  m_curveType->setValue(Linear);

  bindParam(this, "curveType", m_curveType);

  bindParam(this, "inner_color", m_innerColor);

  bindParam(this, "outer_color", m_outerColor);

}

//------------------------------------------------------------

bool Iwa_CorridorGradientFx::doGetBBox(double frame, TRectD &bBox,

                                       const TRenderSettings &ri) {

  bBox = TConsts::infiniteRectD;

  return true;

}

//------------------------------------------------------------

namespace {

QPointF toQPointF(const TPointD &p) { return QPointF(p.x, p.y); }

double WedgeProduct(const TPointD v, const TPointD w) {

  return v.x * w.y - v.y * w.x;

}

struct BilinearParam {

  TPointD p0, b1, b2, b3;

};

//------------------------------------------------------------

double getFactor(const TPointD &p, const BilinearParam ¶m,

                 const GradientCurveType type) {

  double t;

  TPointD q = p - param.p0;

  // Set up quadratic formula

  float A = WedgeProduct(param.b2, param.b3);

  float B = WedgeProduct(param.b3, q) - WedgeProduct(param.b1, param.b2);

  float C = WedgeProduct(param.b1, q);

  // Solve for v

  if (std::abs(A) < 0.001) {

    // Linear form

    t = -C / B;

  } else {

    // Quadratic form

    float discrim = B * B - 4 * A * C;

    t             = 0.5 * (-B - std::sqrt(discrim)) / A;

  }

  double factor;

  switch (type) {

  case Linear:

    factor = t;

    break;

  case EaseIn:

    factor = t * t;

    break;

  case EaseOut:

    factor = 1.0 - (1.0 - t) * (1.0 - t);

    break;

  case EaseInOut:

  default:

    factor = (-2 * t + 3) * (t * t);

    break;

  }

  return factor;

}

//------------------------------------------------------------

template <typename pixel="" raster,="" typename=""></typename>

void doQuadrangleT(RASTER ras, TDimensionI dim, TPointD pos[2][4],

                   const TSpectrumT<pixel> &spectrum, GradientCurveType type) {</pixel>

  auto buildPolygon = [&](QPolygonF &pol, Qt::Corner c1, Qt::Corner c2) {

    pol << toQPointF(pos[0][(int)c1]) << toQPointF(pos[1][(int)c1])

        << toQPointF(pos[1][(int)c2]) << toQPointF(pos[0][(int)c2]);

  };

  auto buildBilinearParam = [&](BilinearParam &bp, Qt::Corner c1,

                                Qt::Corner c2) {

    bp.p0 = pos[0][(int)c1];

    bp.b1 = pos[0][(int)c2] - pos[0][(int)c1];

    bp.b2 = pos[1][(int)c1] - pos[0][(int)c1];

    bp.b3 =

        pos[0][(int)c1] - pos[0][(int)c2] - pos[1][(int)c1] + pos[1][(int)c2];

  };

  std::array<qpolygonf, 4=""> polygons;</qpolygonf,>

  std::array<bilinearparam, 4=""> params;</bilinearparam,>

  // Top

  buildPolygon(polygons[0], Qt::TopLeftCorner, Qt::TopRightCorner);

  buildBilinearParam(params[0], Qt::TopLeftCorner, Qt::TopRightCorner);

  // Left

  buildPolygon(polygons[1], Qt::BottomLeftCorner, Qt::TopLeftCorner);

  buildBilinearParam(params[1], Qt::BottomLeftCorner, Qt::TopLeftCorner);

  // Bottom

  buildPolygon(polygons[2], Qt::BottomRightCorner, Qt::BottomLeftCorner);

  buildBilinearParam(params[2], Qt::BottomRightCorner, Qt::BottomLeftCorner);

  // Right

  buildPolygon(polygons[3], Qt::TopRightCorner, Qt::BottomRightCorner);

  buildBilinearParam(params[3], Qt::TopRightCorner, Qt::BottomRightCorner);

  QPolygonF innerPolygon;

  innerPolygon << toQPointF(pos[0][Qt::TopLeftCorner])

               << toQPointF(pos[0][Qt::TopRightCorner])

               << toQPointF(pos[0][Qt::BottomRightCorner])

               << toQPointF(pos[0][Qt::BottomLeftCorner]);

  ras->lock();

  for (int j = 0; j < ras->getLy(); j++) {

    PIXEL *pix    = ras->pixels(j);

    PIXEL *endPix = pix + ras->getLx();

    int i         = 0;

    while (pix < endPix) {

      QPointF p(i, j);

      double factor;

      bool found = false;

      for (int edge = 0; edge < 4; edge++) {

        if (polygons[edge].containsPoint(p, Qt::WindingFill)) {

          factor = getFactor(TPointD(i, j), params.at(edge), type);

          found  = true;

          break;

        }

      }

      if (!found) {

        if (innerPolygon.containsPoint(p, Qt::WindingFill))

          factor = 0.0;

        else

          factor = 1.0;

      }

      *pix++ = spectrum.getPremultipliedValue(factor);

      i++;

    }

  }

  ras->unlock();

}

//------------------------------------------------------------

template <typename pixel="" raster,="" typename=""></typename>

void doCircleT(RASTER ras, TDimensionI dim, TPointD pos[2][4],

               const TSpectrumT<pixel> &spectrum, GradientCurveType type) {</pixel>

  auto lerp = [](TPointD p1, TPointD p2, double f) {

    return p1 * (1 - f) + p2 * f;

  };

  auto bilinearPos = [&](TPointD uv, int inout) {

    return lerp(lerp(pos[inout][Qt::BottomLeftCorner],

                     pos[inout][Qt::BottomRightCorner], uv.x),

                lerp(pos[inout][Qt::TopLeftCorner],

                     pos[inout][Qt::TopRightCorner], uv.x),

                uv.y);

  };

  const int DIVNUM = 36;

  std::array<tpointd, divnum=""> innerPos;</tpointd,>

  std::array<tpointd, divnum=""> outerPos;</tpointd,>

  double tmpRadius = std::sqrt(2.0) / 2.0;

  for (int div = 0; div < DIVNUM; div++) {

    double angle = 2.0 * M_PI * (double)div / (double)DIVNUM;

    // circle position in uv coordinate

    TPointD uv(tmpRadius * std::cos(angle) + 0.5,

               tmpRadius * std::sin(angle) + 0.5);

    // compute inner and outer circle positions by bilinear interpolation

    // using uv coordinate values.

    innerPos[div] = bilinearPos(uv, 0);

    outerPos[div] = bilinearPos(uv, 1);

  }

  // - - - - - - - -

  auto buildPolygon = [&](QPolygonF &pol, int id1, int id2) {

    pol << toQPointF(innerPos[id2]) << toQPointF(outerPos[id2])

        << toQPointF(outerPos[id1]) << toQPointF(innerPos[id1]);

  };

  auto buildBilinearParam = [&](BilinearParam &bp, int id1, int id2) {

    bp.p0 = innerPos[id2];

    bp.b1 = innerPos[id1] - innerPos[id2];

    bp.b2 = outerPos[id2] - innerPos[id2];

    bp.b3 = innerPos[id2] - innerPos[id1] - outerPos[id2] + outerPos[id1];

  };

  std::array<qpolygonf, divnum=""> polygons;</qpolygonf,>

  std::array<bilinearparam, divnum=""> params;</bilinearparam,>

  QPolygonF innerPolygon;

  for (int div = 0; div < DIVNUM; div++) {

    int next_div = (div == DIVNUM - 1) ? 0 : div + 1;

    // create polygon and bilinear parameters for each piece surrounding the

    // circle

    buildPolygon(polygons[div], div, next_div);

    buildBilinearParam(params[div], div, next_div);

    // create inner circle polygon

    innerPolygon << toQPointF(innerPos[div]);

  }

  // - - - ok, ready to render

  ras->lock();

  for (int j = 0; j < ras->getLy(); j++) {

    PIXEL *pix    = ras->pixels(j);

    PIXEL *endPix = pix + ras->getLx();

    int i         = 0;

    while (pix < endPix) {

      QPointF p(i, j);

      double factor;

      bool found = false;

      for (int div = 0; div < DIVNUM; div++) {

        // check if the point is inside of the surrounding pieces

        if (polygons[div].containsPoint(p, Qt::WindingFill)) {

          // compute factor by invert bilinear interpolation

          factor = getFactor(TPointD(i, j), params.at(div), type);

          found  = true;

          break;

        }

      }

      if (!found) {

        if (innerPolygon.containsPoint(p, Qt::WindingFill))

          factor = 0.0;

        else

          factor = 1.0;

      }

      *pix++ = spectrum.getPremultipliedValue(factor);

      i++;

    }

  }

  ras->unlock();

}

};  // namespace

//------------------------------------------------------------

void Iwa_CorridorGradientFx::doCompute(TTile &tile, double frame,

                                       const TRenderSettings &ri) {

  if (!((TRaster32P)tile.getRaster()) && !((TRaster64P)tile.getRaster())) {

    throw TRopException("unsupported input pixel type");

  }

  // convert shape position to render region coordinate

  TPointD pos[2][4];

  TAffine aff = ri.m_affine;

  TDimensionI dimOut(tile.getRaster()->getLx(), tile.getRaster()->getLy());

  TPointD dimOffset((float)dimOut.lx / 2.0f, (float)dimOut.ly / 2.0f);

  for (int inout = 0; inout < 2; inout++) {

    for (int c = 0; c < 4; c++) {

      TPointD _point = m_points[inout][c]->getValue(frame);

      pos[inout][c]  = aff * _point -

                      (tile.m_pos + tile.getRaster()->getCenterD()) + dimOffset;

    }

  }

  std::vector<tspectrum::colorkey> colors = {</tspectrum::colorkey>

      TSpectrum::ColorKey(0, m_innerColor->getValue(frame)),

      TSpectrum::ColorKey(1, m_outerColor->getValue(frame))};

  TSpectrumParamP m_colors = TSpectrumParamP(colors);

  tile.getRaster()->clear();

  TRaster32P outRas32 = (TRaster32P)tile.getRaster();

  TRaster64P outRas64 = (TRaster64P)tile.getRaster();

  if (m_shape->getValue() == 0) {  // Quadrangle

    if (outRas32)

      doQuadrangleT<traster32p, tpixel32="">(</traster32p,>

          outRas32, dimOut, pos, m_colors->getValue(frame),

          (GradientCurveType)m_curveType->getValue());

    else if (outRas64)

      doQuadrangleT<traster64p, tpixel64="">(</traster64p,>

          outRas64, dimOut, pos, m_colors->getValue64(frame),

          (GradientCurveType)m_curveType->getValue());

  } else {  // m_shape == 1 : Circle

    if (outRas32)

      doCircleT<traster32p, tpixel32="">(</traster32p,>

          outRas32, dimOut, pos, m_colors->getValue(frame),

          (GradientCurveType)m_curveType->getValue());

    else if (outRas64)

      doCircleT<traster64p, tpixel64="">(</traster64p,>

          outRas64, dimOut, pos, m_colors->getValue64(frame),

          (GradientCurveType)m_curveType->getValue());

  }

}

//------------------------------------------------------------

void Iwa_CorridorGradientFx::getParamUIs(TParamUIConcept *&concepts,

                                         int &length) {

  concepts = new TParamUIConcept[length = 6];

  int vectorUiIdOffset = 2;

  std::array<qt::corner, 4=""> loopIds{Qt::TopLeftCorner, Qt::TopRightCorner,</qt::corner,>

                                    Qt::BottomRightCorner,

                                    Qt::BottomLeftCorner};

  for (int inout = 0; inout < 2; inout++) {

    concepts[inout].m_type = TParamUIConcept::QUAD;

    for (int c = 0; c < 4; c++) {

      Qt::Corner corner = loopIds[c];

      // quad ui

      concepts[inout].m_params.push_back(m_points[inout][(int)corner]);

      concepts[inout].m_label = (inout == 0) ? " In" : " Out";

      // vector ui

      if (inout == 0)

        concepts[vectorUiIdOffset + (int)corner].m_type =

            TParamUIConcept::VECTOR;

      concepts[vectorUiIdOffset + (int)corner].m_params.push_back(

          m_points[inout][(int)corner]);

    }

  }

}

//------------------------------------------------------------

FX_PLUGIN_IDENTIFIER(Iwa_CorridorGradientFx, "iwa_CorridorGradientFx");