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#include "iwa_corridorgradientfx.h"
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#include "trop.h"
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#include "tparamuiconcept.h"
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#include "tspectrumparam.h"
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#include "gradients.h"
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#include <qpolygonf></qpolygonf>
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#include <array></array>
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#include <algorithm></algorithm>
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//------------------------------------------------------------
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Iwa_CorridorGradientFx::Iwa_CorridorGradientFx()
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    : m_shape(new TIntEnumParam(0, "Quadrangle"))
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    , m_innerColor(TPixel32::White)
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    , m_outerColor(TPixel32::Black)
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    , m_curveType(new TIntEnumParam()) {
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  for (int inout = 0; inout < 2; inout++) {
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    double size           = (inout == 0) ? 50. : 400.;
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    std::string inout_str = (inout == 0) ? "_in" : "_out";
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    for (int c = 0; c < 4; c++) {
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      Qt::Corner corner = (Qt::Corner)c;
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      TPointD basePos(1, 1);
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      if (corner == Qt::TopLeftCorner || corner == Qt::BottomLeftCorner)
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        basePos.x *= -1;
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      if (corner == Qt::BottomLeftCorner || corner == Qt::BottomRightCorner)
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        basePos.y *= -1;
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      m_points[inout][corner] = basePos * size;
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      m_points[inout][corner]->getX()->setMeasureName("fxLength");
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      m_points[inout][corner]->getY()->setMeasureName("fxLength");
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      std::string TB_str =
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          (corner == Qt::TopLeftCorner || corner == Qt::TopRightCorner)
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              ? "top"
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              : "bottom";
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      std::string LR_str =
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          (corner == Qt::TopLeftCorner || corner == Qt::BottomLeftCorner)
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              ? "_left"
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              : "_right";
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      bindParam(this, TB_str + LR_str + inout_str, m_points[inout][corner]);
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    }
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  }
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  m_shape->addItem(1, "Circle");
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  bindParam(this, "shape", m_shape);
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  m_curveType->addItem(EaseInOut, "Ease In-Out");
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  m_curveType->addItem(Linear, "Linear");
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  m_curveType->addItem(EaseIn, "Ease In");
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  m_curveType->addItem(EaseOut, "Ease Out");
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  m_curveType->setDefaultValue(Linear);
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  m_curveType->setValue(Linear);
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  bindParam(this, "curveType", m_curveType);
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  bindParam(this, "inner_color", m_innerColor);
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  bindParam(this, "outer_color", m_outerColor);
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}
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//------------------------------------------------------------
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bool Iwa_CorridorGradientFx::doGetBBox(double frame, TRectD &bBox,
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                                       const TRenderSettings &ri) {
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  bBox = TConsts::infiniteRectD;
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  return true;
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}
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//------------------------------------------------------------
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namespace {
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QPointF toQPointF(const TPointD &p) { return QPointF(p.x, p.y); }
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double WedgeProduct(const TPointD v, const TPointD w) {
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  return v.x * w.y - v.y * w.x;
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}
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struct BilinearParam {
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  TPointD p0, b1, b2, b3;
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};
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//------------------------------------------------------------
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double getFactor(const TPointD &p, const BilinearParam ¶m,
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                 const GradientCurveType type) {
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  double t;
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  TPointD q = p - param.p0;
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  // Set up quadratic formula
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  float A = WedgeProduct(param.b2, param.b3);
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  float B = WedgeProduct(param.b3, q) - WedgeProduct(param.b1, param.b2);
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  float C = WedgeProduct(param.b1, q);
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  // Solve for v
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  if (std::abs(A) < 0.001) {
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    // Linear form
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    t = -C / B;
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  } else {
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    // Quadratic form
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    float discrim = B * B - 4 * A * C;
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    t             = 0.5 * (-B - std::sqrt(discrim)) / A;
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  }
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  double factor;
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  switch (type) {
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  case Linear:
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    factor = t;
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    break;
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  case EaseIn:
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    factor = t * t;
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    break;
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  case EaseOut:
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    factor = 1.0 - (1.0 - t) * (1.0 - t);
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    break;
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  case EaseInOut:
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  default:
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    factor = (-2 * t + 3) * (t * t);
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    break;
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  }
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  return factor;
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}
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//------------------------------------------------------------
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template <typename pixel="" raster,="" typename=""></typename>
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void doQuadrangleT(RASTER ras, TDimensionI dim, TPointD pos[2][4],
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                   const TSpectrumT<pixel> &spectrum, GradientCurveType type) {</pixel>
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  auto buildPolygon = [&](QPolygonF &pol, Qt::Corner c1, Qt::Corner c2) {
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    pol << toQPointF(pos[0][(int)c1]) << toQPointF(pos[1][(int)c1])
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        << toQPointF(pos[1][(int)c2]) << toQPointF(pos[0][(int)c2]);
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  };
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  auto buildBilinearParam = [&](BilinearParam &bp, Qt::Corner c1,
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                                Qt::Corner c2) {
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    bp.p0 = pos[0][(int)c1];
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    bp.b1 = pos[0][(int)c2] - pos[0][(int)c1];
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    bp.b2 = pos[1][(int)c1] - pos[0][(int)c1];
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    bp.b3 =
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        pos[0][(int)c1] - pos[0][(int)c2] - pos[1][(int)c1] + pos[1][(int)c2];
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  };
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  std::array<qpolygonf, 4=""> polygons;</qpolygonf,>
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  std::array<bilinearparam, 4=""> params;</bilinearparam,>
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  // Top
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  buildPolygon(polygons[0], Qt::TopLeftCorner, Qt::TopRightCorner);
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  buildBilinearParam(params[0], Qt::TopLeftCorner, Qt::TopRightCorner);
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  // Left
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  buildPolygon(polygons[1], Qt::BottomLeftCorner, Qt::TopLeftCorner);
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  buildBilinearParam(params[1], Qt::BottomLeftCorner, Qt::TopLeftCorner);
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  // Bottom
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  buildPolygon(polygons[2], Qt::BottomRightCorner, Qt::BottomLeftCorner);
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  buildBilinearParam(params[2], Qt::BottomRightCorner, Qt::BottomLeftCorner);
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  // Right
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  buildPolygon(polygons[3], Qt::TopRightCorner, Qt::BottomRightCorner);
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  buildBilinearParam(params[3], Qt::TopRightCorner, Qt::BottomRightCorner);
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  QPolygonF innerPolygon;
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  innerPolygon << toQPointF(pos[0][Qt::TopLeftCorner])
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               << toQPointF(pos[0][Qt::TopRightCorner])
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               << toQPointF(pos[0][Qt::BottomRightCorner])
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               << toQPointF(pos[0][Qt::BottomLeftCorner]);
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  ras->lock();
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  for (int j = 0; j < ras->getLy(); j++) {
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    PIXEL *pix    = ras->pixels(j);
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    PIXEL *endPix = pix + ras->getLx();
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    int i         = 0;
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    while (pix < endPix) {
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      QPointF p(i, j);
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      double factor;
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      bool found = false;
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      for (int edge = 0; edge < 4; edge++) {
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        if (polygons[edge].containsPoint(p, Qt::WindingFill)) {
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          factor = getFactor(TPointD(i, j), params.at(edge), type);
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          found  = true;
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          break;
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        }
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      }
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      if (!found) {
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        if (innerPolygon.containsPoint(p, Qt::WindingFill))
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          factor = 0.0;
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        else
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          factor = 1.0;
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      }
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      *pix++ = spectrum.getPremultipliedValue(factor);
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      i++;
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    }
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  }
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  ras->unlock();
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}
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//------------------------------------------------------------
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template <typename pixel="" raster,="" typename=""></typename>
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void doCircleT(RASTER ras, TDimensionI dim, TPointD pos[2][4],
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               const TSpectrumT<pixel> &spectrum, GradientCurveType type) {</pixel>
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  auto lerp = [](TPointD p1, TPointD p2, double f) {
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    return p1 * (1 - f) + p2 * f;
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  };
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  auto bilinearPos = [&](TPointD uv, int inout) {
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    return lerp(lerp(pos[inout][Qt::BottomLeftCorner],
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                     pos[inout][Qt::BottomRightCorner], uv.x),
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                lerp(pos[inout][Qt::TopLeftCorner],
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                     pos[inout][Qt::TopRightCorner], uv.x),
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                uv.y);
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  };
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  const int DIVNUM = 36;
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  std::array<tpointd, divnum=""> innerPos;</tpointd,>
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  std::array<tpointd, divnum=""> outerPos;</tpointd,>
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  double tmpRadius = std::sqrt(2.0) / 2.0;
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  for (int div = 0; div < DIVNUM; div++) {
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    double angle = 2.0 * M_PI * (double)div / (double)DIVNUM;
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    // circle position in uv coordinate
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    TPointD uv(tmpRadius * std::cos(angle) + 0.5,
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               tmpRadius * std::sin(angle) + 0.5);
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    // compute inner and outer circle positions by bilinear interpolation
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    // using uv coordinate values.
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    innerPos[div] = bilinearPos(uv, 0);
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    outerPos[div] = bilinearPos(uv, 1);
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  }
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  // - - - - - - - -
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  auto buildPolygon = [&](QPolygonF &pol, int id1, int id2) {
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    pol << toQPointF(innerPos[id2]) << toQPointF(outerPos[id2])
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        << toQPointF(outerPos[id1]) << toQPointF(innerPos[id1]);
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  };
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  auto buildBilinearParam = [&](BilinearParam &bp, int id1, int id2) {
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    bp.p0 = innerPos[id2];
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    bp.b1 = innerPos[id1] - innerPos[id2];
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    bp.b2 = outerPos[id2] - innerPos[id2];
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    bp.b3 = innerPos[id2] - innerPos[id1] - outerPos[id2] + outerPos[id1];
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  };
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  std::array<qpolygonf, divnum=""> polygons;</qpolygonf,>
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  std::array<bilinearparam, divnum=""> params;</bilinearparam,>
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  QPolygonF innerPolygon;
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  for (int div = 0; div < DIVNUM; div++) {
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    int next_div = (div == DIVNUM - 1) ? 0 : div + 1;
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    // create polygon and bilinear parameters for each piece surrounding the
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    // circle
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    buildPolygon(polygons[div], div, next_div);
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    buildBilinearParam(params[div], div, next_div);
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    // create inner circle polygon
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    innerPolygon << toQPointF(innerPos[div]);
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  }
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  // - - - ok, ready to render
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  ras->lock();
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  for (int j = 0; j < ras->getLy(); j++) {
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    PIXEL *pix    = ras->pixels(j);
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    PIXEL *endPix = pix + ras->getLx();
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    int i         = 0;
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    while (pix < endPix) {
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      QPointF p(i, j);
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      double factor;
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      bool found = false;
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      for (int div = 0; div < DIVNUM; div++) {
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        // check if the point is inside of the surrounding pieces
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        if (polygons[div].containsPoint(p, Qt::WindingFill)) {
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          // compute factor by invert bilinear interpolation
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          factor = getFactor(TPointD(i, j), params.at(div), type);
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          found  = true;
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          break;
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        }
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      }
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      if (!found) {
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        if (innerPolygon.containsPoint(p, Qt::WindingFill))
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          factor = 0.0;
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        else
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          factor = 1.0;
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      }
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      *pix++ = spectrum.getPremultipliedValue(factor);
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      i++;
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    }
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  }
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  ras->unlock();
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}
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};  // namespace
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//------------------------------------------------------------
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void Iwa_CorridorGradientFx::doCompute(TTile &tile, double frame,
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                                       const TRenderSettings &ri) {
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  if (!((TRaster32P)tile.getRaster()) && !((TRaster64P)tile.getRaster())) {
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    throw TRopException("unsupported input pixel type");
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  }
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  // convert shape position to render region coordinate
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  TPointD pos[2][4];
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  TAffine aff = ri.m_affine;
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  TDimensionI dimOut(tile.getRaster()->getLx(), tile.getRaster()->getLy());
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  TPointD dimOffset((float)dimOut.lx / 2.0f, (float)dimOut.ly / 2.0f);
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  for (int inout = 0; inout < 2; inout++) {
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    for (int c = 0; c < 4; c++) {
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      TPointD _point = m_points[inout][c]->getValue(frame);
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      pos[inout][c]  = aff * _point -
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                      (tile.m_pos + tile.getRaster()->getCenterD()) + dimOffset;
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    }
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  }
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  std::vector<tspectrum::colorkey> colors = {</tspectrum::colorkey>
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      TSpectrum::ColorKey(0, m_innerColor->getValue(frame)),
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      TSpectrum::ColorKey(1, m_outerColor->getValue(frame))};
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  TSpectrumParamP m_colors = TSpectrumParamP(colors);
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  tile.getRaster()->clear();
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  TRaster32P outRas32 = (TRaster32P)tile.getRaster();
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  TRaster64P outRas64 = (TRaster64P)tile.getRaster();
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  if (m_shape->getValue() == 0) {  // Quadrangle
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    if (outRas32)
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      doQuadrangleT<traster32p, tpixel32="">(</traster32p,>
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          outRas32, dimOut, pos, m_colors->getValue(frame),
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          (GradientCurveType)m_curveType->getValue());
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    else if (outRas64)
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      doQuadrangleT<traster64p, tpixel64="">(</traster64p,>
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          outRas64, dimOut, pos, m_colors->getValue64(frame),
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          (GradientCurveType)m_curveType->getValue());
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  } else {  // m_shape == 1 : Circle
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    if (outRas32)
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      doCircleT<traster32p, tpixel32="">(</traster32p,>
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          outRas32, dimOut, pos, m_colors->getValue(frame),
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          (GradientCurveType)m_curveType->getValue());
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    else if (outRas64)
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      doCircleT<traster64p, tpixel64="">(</traster64p,>
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          outRas64, dimOut, pos, m_colors->getValue64(frame),
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          (GradientCurveType)m_curveType->getValue());
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  }
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}
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//------------------------------------------------------------
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void Iwa_CorridorGradientFx::getParamUIs(TParamUIConcept *&concepts,
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                                         int &length) {
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  concepts = new TParamUIConcept[length = 6];
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  int vectorUiIdOffset = 2;
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  std::array<qt::corner, 4=""> loopIds{Qt::TopLeftCorner, Qt::TopRightCorner,</qt::corner,>
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                                    Qt::BottomRightCorner,
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                                    Qt::BottomLeftCorner};
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  for (int inout = 0; inout < 2; inout++) {
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    concepts[inout].m_type = TParamUIConcept::QUAD;
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    for (int c = 0; c < 4; c++) {
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      Qt::Corner corner = loopIds[c];
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      // quad ui
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      concepts[inout].m_params.push_back(m_points[inout][(int)corner]);
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      concepts[inout].m_label = (inout == 0) ? " In" : " Out";
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      // vector ui
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      if (inout == 0)
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        concepts[vectorUiIdOffset + (int)corner].m_type =
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            TParamUIConcept::VECTOR;
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      concepts[vectorUiIdOffset + (int)corner].m_params.push_back(
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          m_points[inout][(int)corner]);
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    }
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  }
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}
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//------------------------------------------------------------
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FX_PLUGIN_IDENTIFIER(Iwa_CorridorGradientFx, "iwa_CorridorGradientFx");