#include "iwa_textfx.h"

#include "tparamuiconcept.h"

#include <qfontmetrics></qfontmetrics>

#include <qimage></qimage>

#include <qpainter></qpainter>

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

Iwa_TextFx::Iwa_TextFx()

    : m_text(L"Lorem ipsum")

    , m_hAlign(new TIntEnumParam(Qt::AlignLeft, "Left"))

    , m_center(TPointD(0.0, 0.0))

    , m_width(200.0)

    , m_height(60.0)

    , m_font(new TFontParam())

    , m_textColor(TPixel32::Black)

    , m_boxColor(TPixel32::Transparent)

    , m_showBorder(false) {

  m_targetType->setValue(INPUT_TEXT);

  m_hAlign->addItem(Qt::AlignRight, "Right");

  m_hAlign->addItem(Qt::AlignHCenter, "Center");

  m_hAlign->addItem(Qt::AlignJustify, "Justify");

  m_text->setMultiLineEnabled(true);

  m_center->getX()->setMeasureName("fxLength");

  m_center->getY()->setMeasureName("fxLength");

  m_width->setMeasureName("fxLength");

  m_height->setMeasureName("fxLength");

  m_width->setValueRange(1.0, (std::numeric_limits<double>::max)());</double>

  m_height->setValueRange(1.0, (std::numeric_limits<double>::max)());</double>

  // set the initial font size to 30

  QFont font;

  font.fromString(QString::fromStdWString(m_font->getValue()));

  font.setPixelSize(30);

  m_font->setValue(font.toString().toStdWString(), true);

  bindParam(this, "targetType", m_targetType);

  bindParam(this, "columnIndex", m_columnIndex);

  bindParam(this, "text", m_text);

  bindParam(this, "hAlign", m_hAlign);

  bindParam(this, "center", m_center);

  bindParam(this, "width", m_width);

  bindParam(this, "height", m_height);

  bindParam(this, "font", m_font);

  bindParam(this, "textColor", m_textColor);

  bindParam(this, "boxColor", m_boxColor);

  bindParam(this, "showBorder", m_showBorder);

}

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

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

                           const TRenderSettings &ri) {

  bBox = TConsts::infiniteRectD;

  return true;

}

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

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

                           const TRenderSettings &ri) {

  QString text;

  if (m_targetType->getValue() == INPUT_TEXT)

    text = QString::fromStdWString(m_text->getValue());

  else

    text = m_noteLevelStr;

  if (text.isEmpty()) return;

  QFont font;

  font.fromString(QString::fromStdWString(m_font->getValue()));

  double fac = sqrt(fabs(ri.m_affine.det()));

  int size   = (int)(fac * fabs(font.pixelSize()));

  TPoint center = convert(

      fac * m_center->getValue(frame) -

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

      TPointD(ri.m_cameraBox.getLx() / 2.0, ri.m_cameraBox.getLy() / 2.0));

  QRect textBoxRect(0, 0, fac * m_width->getValue(frame),

                    fac * m_height->getValue(frame));

  textBoxRect.moveCenter(QPoint(center.x, center.y));

  Qt::AlignmentFlag hAlignFlag = (Qt::AlignmentFlag)m_hAlign->getValue();

  // For simplification, text will always be "wrapped".

  // If user would like to make the line with no break, they can just expand the

  // boundary or set the smaller font size.

  int flag = hAlignFlag | Qt::AlignVCenter | Qt::TextWordWrap;

  QFont tmpFont(font);

  tmpFont.setPixelSize(100);

  QFontMetricsF tmpFm(tmpFont);

  QRectF bbox = tmpFm.boundingRect(textBoxRect, flag, text);

  float ratio = std::min(textBoxRect.width() / bbox.width(),

                         textBoxRect.height() / bbox.height());

  // compute the font size which will just fit the item region

  int fontSize = (int)(100.0f * ratio);

  tmpFont.setPixelSize(fontSize);

  tmpFm = QFontMetricsF(tmpFont);

  bbox  = tmpFm.boundingRect(textBoxRect, flag, text);

  bool isInRect;

  if (textBoxRect.width() >= bbox.width() &&

      textBoxRect.height() >= bbox.height())

    isInRect = true;

  else

    isInRect = false;

  while (1) {

    fontSize += (isInRect) ? 1 : -1;

    if (fontSize <= 0)  // cannot draw

      return;

    if (isInRect && fontSize >= size) break;

    tmpFont.setPixelSize(fontSize);

    tmpFm = QFontMetricsF(tmpFont);

    bbox  = tmpFm.boundingRect(textBoxRect, flag, text);

    bool newIsInRect = (textBoxRect.width() >= bbox.width() &&

                        textBoxRect.height() >= bbox.height());

    if (isInRect != newIsInRect) {

      if (isInRect) fontSize--;

      break;

    }

  }

  if (size < fontSize) {

    fontSize = size;

  }

  font.setPixelSize(fontSize);

  tmpFm = QFontMetricsF(font);

  bbox  = tmpFm.boundingRect(textBoxRect, flag, text);

  double lineWidth = 0.1 * (double)fontSize;

  // Usually the text bounding box has less horizontal margin than vertical.

  // So here I added more margin to width.

  QImage img(bbox.width() + (int)(lineWidth * 4),

             bbox.height() + (int)(lineWidth * 2),

             QImage::Format_ARGB32_Premultiplied);

  img.fill(Qt::transparent);

  bbox.moveCenter(img.rect().center());

  QPainter painter(&img);

  TPixel32 boxColor = m_boxColor->getValue(frame);

  TPixel32 color    = m_textColor->getValue(frame);

  if (boxColor.m > 0)

    painter.fillRect(img.rect(), QColor((int)boxColor.r, (int)boxColor.g,

                                        (int)boxColor.b, (int)boxColor.m));

  QPen pen(QColor((int)color.r, (int)color.g, (int)color.b, (int)color.m));

  painter.setPen(pen);

  painter.setFont(font);

  painter.drawText(bbox, flag, text);

  if (m_showBorder->getValue()) {

    pen.setWidthF(lineWidth);

    pen.setJoinStyle(Qt::MiterJoin);

    painter.setPen(pen);

    painter.drawRect(img.rect().adjusted(lineWidth / 2, lineWidth / 2,

                                         -lineWidth / 2, -lineWidth / 2));

  }

  TPoint imgRootPos = center - TPoint(img.width() / 2, img.height() / 2);

  tile.getRaster()->clear();

  TRaster32P ras32 = (TRaster32P)tile.getRaster();

  TRaster64P ras64 = (TRaster64P)tile.getRaster();

  if (ras32)

    putTextImage<traster32p, tpixel32="">(ras32, imgRootPos, img);</traster32p,>

  else if (ras64)

    putTextImage<traster64p, tpixel64="">(ras64, imgRootPos, img);</traster64p,>

  else

    throw TException("Iwa_TextFx: unsupported Pixel Type");

}

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

void Iwa_TextFx::getParamUIs(TParamUIConcept *&concepts, int &length) {

  concepts = new TParamUIConcept[length = 2];

  concepts[0].m_type  = TParamUIConcept::POINT;

  concepts[0].m_label = "Center";

  concepts[0].m_params.push_back(m_center);

  concepts[1].m_type = TParamUIConcept::RECT;

  concepts[1].m_params.push_back(m_width);

  concepts[1].m_params.push_back(m_height);

  concepts[1].m_params.push_back(m_center);

}

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

std::string Iwa_TextFx::getAlias(double frame,

                                 const TRenderSettings &info) const {

  std::string alias = getFxType();

  alias += "[";

  std::string paramalias("");

  for (int i = 0; i < getParams()->getParamCount(); ++i) {

    TParam *param = getParams()->getParam(i);

    paramalias += param->getName() + "=" + param->getValueAlias(frame, 3);

  }

  if (m_targetType->getValue() == INPUT_TEXT)

    return alias + "," + std::to_string(getIdentifier()) + paramalias + "]";

  else

    return alias + std::to_string(frame) + "," +

           std::to_string(getIdentifier()) + paramalias + "]";

}

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

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

void Iwa_TextFx::putTextImage(const RASTER srcRas, TPoint &pos, QImage &img) {

  for (int j = 0; j < img.height(); j++) {

    int rasY = pos.y + j;

    if (rasY < 0) continue;

    if (srcRas->getLy() <= rasY) break;

    PIXEL *pix  = srcRas->pixels(rasY);

    QRgb *img_p = (QRgb *)img.scanLine(img.height() - j - 1);

    for (int i = 0; i < img.width(); i++, img_p++) {

      int rasX = pos.x + i;

      if (rasX < 0) continue;

      if (srcRas->getLx() <= rasX) break;

      pix[rasX].r = (typename PIXEL::Channel)(

          qRed(*img_p) * (int)PIXEL::maxChannelValue / (int)UCHAR_MAX);

      pix[rasX].g = (typename PIXEL::Channel)(

          qGreen(*img_p) * (int)PIXEL::maxChannelValue / (int)UCHAR_MAX);

      pix[rasX].b = (typename PIXEL::Channel)(

          qBlue(*img_p) * (int)PIXEL::maxChannelValue / (int)UCHAR_MAX);

      pix[rasX].m = (typename PIXEL::Channel)(

          qAlpha(*img_p) * (int)PIXEL::maxChannelValue / (int)UCHAR_MAX);

    }

  }

}

//==============================================================================

FX_PLUGIN_IDENTIFIER(Iwa_TextFx, "iwa_TextFx");