#include "graphic_qt.h"

#include <QBrush>
#include <QColor>
#include <QDebug>
#include <QFile>
#include <QFont>
#include <QFontDatabase>
#include <QGlyphRun>
#include <QPainter>
#include <QPen>
#include <QPointF>
#include <QRectF>
#include <QString>
#include <QTransform>
#include <QtGlobal>
#include <QtMath>

#include "utils/log.h"
#include "utils/utils.h"

using namespace microtex;
using namespace std;

namespace {
QMap<QString, QString> _qtFamilies;
}

void Font_qt::loadFont(const std::string& file) {
  QString filename(QString::fromStdString(file));
  if (!QFile::exists(filename)) {
    filename.prepend(":/");
  }
  // find from cache first
  if (_qtFamilies.contains(filename)) {
    _font.setFamily(_qtFamilies.value(filename));
    return;
  }
  // load to font database
  int id = QFontDatabase::addApplicationFont(filename);
  if (id == -1) {
#ifdef HAVE_LOG
    logv("failed to load font: %s\n", file.c_str());
#endif
  } else {
    auto families = QFontDatabase::applicationFontFamilies(id);
    if (families.size() >= 0) {
      auto first = families.first();
      _qtFamilies[filename] = first;
      _font.setFamily(families.first());
    } else {
#ifdef HAVE_LOG
      logv("no font families found: %s\n", file.c_str());
#endif
    }
  }
}

Font_qt::Font_qt(const std::string& file) {
  loadFont(file);
}

QFont Font_qt::getQFont() const {
  return _font;
}

bool Font_qt::operator==(const Font& f) const {
  const auto& cast = static_cast<const Font_qt&>(f);
  return _font == cast._font;
}

/**************************************************************************************************/

namespace {
std::string _fallbackFontFamily;
}

void TextLayout_qt::setFallbackFontFamily(const std::string& family) {
  _fallbackFontFamily = family;
}

TextLayout_qt::TextLayout_qt(const std::string& src, FontStyle style, float size) {
  _text = QString::fromStdString(src);
  _font.setPixelSize(size);
#define QT_BEFORE_513 (QT_VERSION < QT_VERSION_CHECK(5, 13, 0))
#if QT_BEFORE_513
  // setFamilies was introduce in Qt 5.13.0
  // https://doc.qt.io/qt-6/qfont.html#setFamily
  QString family;
#else
  QStringList families;
#endif
  if (microtex::isSansSerif(style)) {
#if QT_BEFORE_513
    family = "sans-serif";
#else
    families.append("sans-serif");
#endif
  } else {
#if QT_BEFORE_513
    family = "serif";
#else
    families.append("serif");
#endif
  }
  if (microtex::isMono(style)) {
#if QT_BEFORE_513
    family = "monospace";
#else
    families.append("monospace");
#endif
  }
#if !QT_BEFORE_513
  if (!_fallbackFontFamily.empty()) {
    families.append(QString::fromStdString(_fallbackFontFamily));
  }
#endif
#if QT_BEFORE_513
  _font.setFamily(family);
#else
  _font.setFamilies(families);
#endif
  _font.setBold(microtex::isBold(style));
  _font.setItalic(microtex::isItalic(style));
}

void TextLayout_qt::getBounds(Rect& r) {
  QFontMetricsF fm(_font);
  QRectF br(fm.boundingRect(_text));
  r.x = br.left();
  r.y = br.top();
  r.w = br.width();
  r.h = br.height();
}

void TextLayout_qt::draw(Graphics2D& g2, float x, float y) {
  auto& g = static_cast<Graphics2D_qt&>(g2);
  g.getQPainter()->setFont(_font);
  g.getQPainter()->drawText(QPointF(x, y), _text);
}

/**************************************************************************************************/

sptr<Font> PlatformFactory_qt::createFont(const std::string& file) {
  return sptrOf<Font_qt>(file);
}

sptr<TextLayout>
PlatformFactory_qt::createTextLayout(const std::string& src, FontStyle style, float size) {
  return sptrOf<TextLayout_qt>(src, style, size);
}

/**************************************************************************************************/

Graphics2D_qt::Graphics2D_qt(QPainter* painter) : _painter(painter) {
  _sx = _sy = 1.f;
  _fontSize = 1.f;
  setColor(BLACK);
  setStroke(Stroke());
}

QPainter* Graphics2D_qt::getQPainter() const {
  return _painter;
}

QBrush Graphics2D_qt::getQBrush() const {
  return QBrush(QColor(color_r(_color), color_g(_color), color_b(_color), color_a(_color)));
}

void Graphics2D_qt::setColor(color c) {
  _color = c;
  _pen.setBrush(getQBrush());
  _painter->setPen(_pen);
}

color Graphics2D_qt::getColor() const {
  return _color;
}

void Graphics2D_qt::setStroke(const Stroke& s) {
  _stroke = s;
  Qt::PenCapStyle cap;
  switch (_stroke.cap) {
    case CAP_ROUND: cap = Qt::RoundCap; break;
    case CAP_SQUARE: cap = Qt::SquareCap; break;
    case CAP_BUTT:
    default: cap = Qt::FlatCap; break;
  }
  Qt::PenJoinStyle join;
  switch (_stroke.join) {
    case JOIN_BEVEL: join = Qt::BevelJoin; break;
    case JOIN_ROUND: join = Qt::RoundJoin; break;
    case JOIN_MITER:
    default: join = Qt::MiterJoin; break;
  }
  _pen.setStyle(Qt::SolidLine);
  _pen.setCapStyle(cap);
  _pen.setJoinStyle(join);
  _pen.setWidthF(s.lineWidth);
  _pen.setMiterLimit(s.miterLimit);
  _painter->setPen(_pen);
}

const Stroke& Graphics2D_qt::getStroke() const {
  return _stroke;
}

void Graphics2D_qt::setStrokeWidth(float w) {
  _stroke.lineWidth = w;
  _pen.setWidthF(w);
  _painter->setPen(_pen);
}

void Graphics2D_qt::setDash(const std::vector<float>& dash) {
  if (dash.empty()) {
    _pen.setStyle(Qt::SolidLine);
    _pen.setDashPattern({});
  } else {
    _pen.setStyle(Qt::DashLine);
#if QT_VERSION_MAJOR < 6
    QVector<qreal> list;
#else
    QList<qreal> list;
#endif
    list.reserve(dash.size());
    std::transform(dash.begin(), dash.end(), list.begin(), [this](float v) { return v * sx(); });
    _pen.setDashPattern(list);
  }
  _painter->setPen(_pen);
}

std::vector<float> Graphics2D_qt::getDash() {
  const auto& list = _pen.dashPattern();
  std::vector<float> dash;
  dash.reserve(list.size());
  std::transform(list.begin(), list.end(), dash.begin(), [this](double v) { return v / sx(); });
  return dash;
}

sptr<Font> Graphics2D_qt::getFont() const {
  return _font;
}

void Graphics2D_qt::setFont(const sptr<Font>& font) {
  _font = static_pointer_cast<Font_qt>(font);
}

float Graphics2D_qt::getFontSize() const {
  return _fontSize;
}

void Graphics2D_qt::setFontSize(float size) {
  _fontSize = size;
}

void Graphics2D_qt::translate(float dx, float dy) {
  _painter->translate(dx, dy);
}

void Graphics2D_qt::scale(float sx, float sy) {
  _sx *= sx;
  _sy *= sy;
  _painter->scale(sx, sy);
}

void Graphics2D_qt::rotate(float angle) {
  _painter->rotate(qRadiansToDegrees(angle));
}

void Graphics2D_qt::rotate(float angle, float px, float py) {
  _painter->translate(px, py);
  _painter->rotate(qRadiansToDegrees(angle));
  _painter->translate(-px, -py);
}

void Graphics2D_qt::reset() {
  _painter->setTransform(QTransform());
  _sx = _sy = 1.f;
}

float Graphics2D_qt::sx() const {
  return _sx;
}

float Graphics2D_qt::sy() const {
  return _sy;
}

void Graphics2D_qt::drawGlyph(u16 glyph, float x, float y) {
  auto f = _font->getQFont();
  // f.setPointSizeF(_fontSize);
  f.setPixelSize(_fontSize);
  auto rf = QRawFont::fromFont(f);
  QGlyphRun g;
  g.setRawFont(rf);
  g.setGlyphIndexes({glyph});
  g.setPositions({
    {0, 0}
  });
  _painter->drawGlyphRun({x, y}, g);
}

bool Graphics2D_qt::beginPath(i32 id) {
  _path = QPainterPath();
  return false;
}

void Graphics2D_qt::moveTo(float x, float y) {
  _path.moveTo(x, y);
}

void Graphics2D_qt::lineTo(float x, float y) {
  _path.lineTo(x, y);
}

void Graphics2D_qt::cubicTo(float x1, float y1, float x2, float y2, float x3, float y3) {
  _path.cubicTo(x1, y1, x2, y2, x3, y3);
}

void Graphics2D_qt::quadTo(float x1, float y1, float x2, float y2) {
  _path.quadTo(x1, y1, x2, y2);
}

void Graphics2D_qt::closePath() {
  _path.closeSubpath();
}

void Graphics2D_qt::fillPath(i32 id) {
  _painter->fillPath(_path, getQBrush());
}

void Graphics2D_qt::drawLine(float x1, float y1, float x2, float y2) {
  _painter->drawLine(QPointF(x1, y1), QPointF(x2, y2));
}

void Graphics2D_qt::drawRect(float x, float y, float w, float h) {
  _painter->drawRect(QRectF(x, y, w, h));
}

void Graphics2D_qt::fillRect(float x, float y, float w, float h) {
  _painter->fillRect(QRectF(x, y, w, h), getQBrush());
}

void Graphics2D_qt::drawRoundRect(float x, float y, float w, float h, float rx, float ry) {
  _painter->drawRoundedRect(QRectF(x, y, w, h), rx, ry);
}

void Graphics2D_qt::fillRoundRect(float x, float y, float w, float h, float rx, float ry) {
  _painter->setPen(QPen(Qt::NoPen));
  _painter->setBrush(getQBrush());

  _painter->drawRoundedRect(QRectF(x, y, w, h), rx, ry);

  _painter->setPen(_pen);
}