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#include "iwa_textfx.h"
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#include "tparamuiconcept.h"
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#include <qfontmetrics></qfontmetrics>
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#include <qimage></qimage>
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#include <qpainter></qpainter>
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//------------------------------------------------------------------
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Iwa_TextFx::Iwa_TextFx()
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    : m_text(L"Lorem ipsum")
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    , m_hAlign(new TIntEnumParam(Qt::AlignLeft, "Left"))
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    , m_center(TPointD(0.0, 0.0))
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    , m_width(200.0)
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    , m_height(60.0)
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    , m_font(new TFontParam())
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    , m_textColor(TPixel32::Black)
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    , m_boxColor(TPixel32::Transparent)
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    , m_showBorder(false) {
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  m_targetType->setValue(INPUT_TEXT);
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  m_hAlign->addItem(Qt::AlignRight, "Right");
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  m_hAlign->addItem(Qt::AlignHCenter, "Center");
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  m_hAlign->addItem(Qt::AlignJustify, "Justify");
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  m_text->setMultiLineEnabled(true);
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  m_center->getX()->setMeasureName("fxLength");
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  m_center->getY()->setMeasureName("fxLength");
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  m_width->setMeasureName("fxLength");
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  m_height->setMeasureName("fxLength");
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  m_width->setValueRange(1.0, (std::numeric_limits<double>::max)());</double>
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  m_height->setValueRange(1.0, (std::numeric_limits<double>::max)());</double>
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  // set the initial font size to 30
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  QFont font;
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  font.fromString(QString::fromStdWString(m_font->getValue()));
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  font.setPixelSize(30);
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  m_font->setValue(font.toString().toStdWString(), true);
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  bindParam(this, "targetType", m_targetType);
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  bindParam(this, "columnIndex", m_columnIndex);
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  bindParam(this, "text", m_text);
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  bindParam(this, "hAlign", m_hAlign);
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  bindParam(this, "center", m_center);
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  bindParam(this, "width", m_width);
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  bindParam(this, "height", m_height);
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  bindParam(this, "font", m_font);
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  bindParam(this, "textColor", m_textColor);
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  bindParam(this, "boxColor", m_boxColor);
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  bindParam(this, "showBorder", m_showBorder);
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}
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//------------------------------------------------------------------
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bool Iwa_TextFx::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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void Iwa_TextFx::doCompute(TTile &tile, double frame,
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                           const TRenderSettings &ri) {
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  QString text;
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  if (m_targetType->getValue() == INPUT_TEXT)
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    text = QString::fromStdWString(m_text->getValue());
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  else
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    text = m_noteLevelStr;
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  if (text.isEmpty()) return;
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  QFont font;
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  font.fromString(QString::fromStdWString(m_font->getValue()));
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  double fac = sqrt(fabs(ri.m_affine.det()));
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  int size   = (int)(fac * fabs(font.pixelSize()));
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  TPoint center = convert(
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      fac * m_center->getValue(frame) -
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      (tile.m_pos + tile.getRaster()->getCenterD()) +
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      TPointD(ri.m_cameraBox.getLx() / 2.0, ri.m_cameraBox.getLy() / 2.0));
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  QRect textBoxRect(0, 0, fac * m_width->getValue(frame),
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                    fac * m_height->getValue(frame));
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  textBoxRect.moveCenter(QPoint(center.x, center.y));
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  Qt::AlignmentFlag hAlignFlag = (Qt::AlignmentFlag)m_hAlign->getValue();
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  // For simplification, text will always be "wrapped".
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  // If user would like to make the line with no break, they can just expand the
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  // boundary or set the smaller font size.
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  int flag = hAlignFlag | Qt::AlignVCenter | Qt::TextWordWrap;
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  QFont tmpFont(font);
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  tmpFont.setPixelSize(100);
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  QFontMetricsF tmpFm(tmpFont);
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  QRectF bbox = tmpFm.boundingRect(textBoxRect, flag, text);
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  float ratio = std::min(textBoxRect.width() / bbox.width(),
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                         textBoxRect.height() / bbox.height());
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  // compute the font size which will just fit the item region
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  int fontSize = (int)(100.0f * ratio);
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  tmpFont.setPixelSize(fontSize);
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  tmpFm = QFontMetricsF(tmpFont);
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  bbox  = tmpFm.boundingRect(textBoxRect, flag, text);
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  bool isInRect;
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  if (textBoxRect.width() >= bbox.width() &&
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      textBoxRect.height() >= bbox.height())
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    isInRect = true;
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  else
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    isInRect = false;
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  while (1) {
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    fontSize += (isInRect) ? 1 : -1;
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    if (fontSize <= 0)  // cannot draw
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      return;
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    if (isInRect && fontSize >= size) break;
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    tmpFont.setPixelSize(fontSize);
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    tmpFm = QFontMetricsF(tmpFont);
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    bbox  = tmpFm.boundingRect(textBoxRect, flag, text);
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    bool newIsInRect = (textBoxRect.width() >= bbox.width() &&
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                        textBoxRect.height() >= bbox.height());
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    if (isInRect != newIsInRect) {
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      if (isInRect) fontSize--;
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      break;
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    }
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  }
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  if (size < fontSize) {
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    fontSize = size;
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  }
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  font.setPixelSize(fontSize);
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  tmpFm = QFontMetricsF(font);
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  bbox  = tmpFm.boundingRect(textBoxRect, flag, text);
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  double lineWidth = 0.1 * (double)fontSize;
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  // Usually the text bounding box has less horizontal margin than vertical.
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  // So here I added more margin to width.
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  QImage img(bbox.width() + (int)(lineWidth * 4),
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             bbox.height() + (int)(lineWidth * 2),
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             QImage::Format_ARGB32_Premultiplied);
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  img.fill(Qt::transparent);
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  bbox.moveCenter(img.rect().center());
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  QPainter painter(&img);
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  TPixel32 boxColor = m_boxColor->getValue(frame);
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  TPixel32 color    = m_textColor->getValue(frame);
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  if (boxColor.m > 0)
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    painter.fillRect(img.rect(), QColor((int)boxColor.r, (int)boxColor.g,
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                                        (int)boxColor.b, (int)boxColor.m));
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  QPen pen(QColor((int)color.r, (int)color.g, (int)color.b, (int)color.m));
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  painter.setPen(pen);
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  painter.setFont(font);
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  painter.drawText(bbox, flag, text);
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  if (m_showBorder->getValue()) {
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    pen.setWidthF(lineWidth);
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    pen.setJoinStyle(Qt::MiterJoin);
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    painter.setPen(pen);
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    painter.drawRect(img.rect().adjusted(lineWidth / 2, lineWidth / 2,
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                                         -lineWidth / 2, -lineWidth / 2));
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  }
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  TPoint imgRootPos = center - TPoint(img.width() / 2, img.height() / 2);
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  tile.getRaster()->clear();
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  TRaster32P ras32 = (TRaster32P)tile.getRaster();
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  TRaster64P ras64 = (TRaster64P)tile.getRaster();
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  if (ras32)
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    putTextImage<traster32p, tpixel32="">(ras32, imgRootPos, img);</traster32p,>
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  else if (ras64)
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    putTextImage<traster64p, tpixel64="">(ras64, imgRootPos, img);</traster64p,>
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  else
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    throw TException("Iwa_TextFx: unsupported Pixel Type");
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}
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//------------------------------------------------------------------
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void Iwa_TextFx::getParamUIs(TParamUIConcept *&concepts, int &length) {
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  concepts = new TParamUIConcept[length = 2];
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  concepts[0].m_type  = TParamUIConcept::POINT;
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  concepts[0].m_label = "Center";
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  concepts[0].m_params.push_back(m_center);
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  concepts[1].m_type = TParamUIConcept::RECT;
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  concepts[1].m_params.push_back(m_width);
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  concepts[1].m_params.push_back(m_height);
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  concepts[1].m_params.push_back(m_center);
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}
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//------------------------------------------------------------------
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std::string Iwa_TextFx::getAlias(double frame,
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                                 const TRenderSettings &info) const {
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  std::string alias = getFxType();
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  alias += "[";
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  std::string paramalias("");
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  for (int i = 0; i < getParams()->getParamCount(); ++i) {
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    TParam *param = getParams()->getParam(i);
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    paramalias += param->getName() + "=" + param->getValueAlias(frame, 3);
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  }
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  if (m_targetType->getValue() == INPUT_TEXT)
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    return alias + "," + std::to_string(getIdentifier()) + paramalias + "]";
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  else
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    return alias + std::to_string(frame) + "," +
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           std::to_string(getIdentifier()) + paramalias + "]";
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}
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//------------------------------------------------------------------
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template <typename pixel="" raster,="" typename=""></typename>
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void Iwa_TextFx::putTextImage(const RASTER srcRas, TPoint &pos, QImage &img) {
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  for (int j = 0; j < img.height(); j++) {
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    int rasY = pos.y + j;
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    if (rasY < 0) continue;
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    if (srcRas->getLy() <= rasY) break;
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    PIXEL *pix  = srcRas->pixels(rasY);
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    QRgb *img_p = (QRgb *)img.scanLine(img.height() - j - 1);
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    for (int i = 0; i < img.width(); i++, img_p++) {
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      int rasX = pos.x + i;
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      if (rasX < 0) continue;
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      if (srcRas->getLx() <= rasX) break;
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      pix[rasX].r = (typename PIXEL::Channel)(
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          qRed(*img_p) * (int)PIXEL::maxChannelValue / (int)UCHAR_MAX);
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      pix[rasX].g = (typename PIXEL::Channel)(
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          qGreen(*img_p) * (int)PIXEL::maxChannelValue / (int)UCHAR_MAX);
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      pix[rasX].b = (typename PIXEL::Channel)(
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          qBlue(*img_p) * (int)PIXEL::maxChannelValue / (int)UCHAR_MAX);
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      pix[rasX].m = (typename PIXEL::Channel)(
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          qAlpha(*img_p) * (int)PIXEL::maxChannelValue / (int)UCHAR_MAX);
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    }
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  }
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}
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//==============================================================================
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FX_PLUGIN_IDENTIFIER(Iwa_TextFx, "iwa_TextFx");