// Toonz includes

#include "tvectorimage.h"

#include "trasterimage.h"

#include "tlevel_io.h"

#include "tofflinegl.h"

#include "tropcm.h"

#include "tvectorrenderdata.h"

#include "tsystem.h"

#include "tvectorgl.h"

// Qt includes

#include <qdir></qdir>

#include <qimage></qimage>

#include <qoffscreensurface></qoffscreensurface>

#include <qthread></qthread>

#include <qguiapplication></qguiapplication>

#include <qopenglcontext></qopenglcontext>

#include <qopenglframebufferobject></qopenglframebufferobject>

#include "toonz/stylemanager.h"

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

//    Local namespace stuff

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

namespace {

TFilePath rootPath;

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

void convertRaster32ToImage(TRaster32P ras, QImage *image) {

  int lx = ras->getLx();

  int ly = ras->getLy();

  int i, j;

  ras->lock();

  for (i = 0; i < lx; i++)

    for (j = 0; j < ly; j++) {

      TPixel32 pix = ras->pixels(ly - 1 - j)[i];

      QRgb value;

      value = qRgba(pix.r, pix.g, pix.b, pix.m);

      image->setPixel(i, j, value);

    }

  ras->unlock();

}

}  // namespace

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

//    StyleLoaderTask definition

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

class CustomStyleManager::StyleLoaderTask final : public TThread::Runnable {

  CustomStyleManager *m_manager;

  TFilePath m_fp;

  PatternData m_data;

  std::shared_ptr<qoffscreensurface> m_offScreenSurface;</qoffscreensurface>

public:

  StyleLoaderTask(CustomStyleManager *manager, const TFilePath &fp);

  void run() override;

  void onFinished(TThread::RunnableP sender) override;

};

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

CustomStyleManager::StyleLoaderTask::StyleLoaderTask(

    CustomStyleManager *manager, const TFilePath &fp)

    : m_manager(manager), m_fp(fp) {

  connect(this, SIGNAL(finished(TThread::RunnableP)), this,

          SLOT(onFinished(TThread::RunnableP)));

  if (QThread::currentThread() == qGuiApp->thread()) {

    m_offScreenSurface.reset(new QOffscreenSurface());

    m_offScreenSurface->setFormat(QSurfaceFormat::defaultFormat());

    m_offScreenSurface->create();

  }

}

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

void CustomStyleManager::StyleLoaderTask::run() {

  try {

    // Fetch the level

    TLevelReaderP lr(m_fp);

    TLevelP level = lr->loadInfo();

    if (!level || level->getFrameCount() == 0) return;

    // Fetch the image of the first frame in the level

    TLevel::Iterator frameIt = level->begin();

    if (frameIt == level->end()) return;

    TImageP img = lr->getFrameReader(frameIt->first)->load();

    // Process the image

    const QSize &qChipSize = m_manager->getChipSize();

    TDimension chipSize(qChipSize.width(), qChipSize.height());

    TVectorImageP vimg = img;

    TRasterImageP rimg = img;

    TRaster32P ras;

    QImage *image = nullptr;

    if (vimg) {

      assert(level->getPalette());

      TPalette *vPalette = level->getPalette();

      assert(vPalette);

      vimg->setPalette(vPalette);

      QOpenGLContext *glContext = new QOpenGLContext();

      if (QOpenGLContext::currentContext())

        glContext->setShareContext(QOpenGLContext::currentContext());

      glContext->setFormat(QSurfaceFormat::defaultFormat());

      glContext->create();

      glContext->makeCurrent(m_offScreenSurface.get());

      // attaching stencil buffer here as some styles use it

      QOpenGLFramebufferObject fb(

          chipSize.lx, chipSize.ly,

          QOpenGLFramebufferObject::CombinedDepthStencil);

      fb.bind();

      // Draw

      glViewport(0, 0, chipSize.lx, chipSize.ly);

      glClearColor(1.0, 1.0, 1.0, 1.0);  // clear with white color

      glClear(GL_COLOR_BUFFER_BIT);

      glMatrixMode(GL_PROJECTION);

      glLoadIdentity();

      gluOrtho2D(0, chipSize.lx, 0, chipSize.ly);

      glMatrixMode(GL_MODELVIEW);

      glLoadIdentity();

      TRectD bbox = img->getBBox();

      double scx  = 0.8 * chipSize.lx / bbox.getLx();

      double scy  = 0.8 * chipSize.ly / bbox.getLy();

      double sc   = std::min(scx, scy);

      double dx   = 0.5 * chipSize.lx;

      double dy   = 0.5 * chipSize.ly;

      TAffine aff =

          TTranslation(dx, dy) * TScale(sc) *

          TTranslation(-0.5 * (bbox.x0 + bbox.x1), -0.5 * (bbox.y0 + bbox.y1));

      TVectorRenderData rd(aff, chipSize, vPalette, 0, true);

      tglDraw(rd, vimg.getPointer());

      image = new QImage(fb.toImage().scaled(QSize(chipSize.lx, chipSize.ly),

                                             Qt::IgnoreAspectRatio,

                                             Qt::SmoothTransformation));

      fb.release();

      glContext->deleteLater();

    } else if (rimg) {

      TDimension size = rimg->getRaster()->getSize();

      if (size == chipSize)

        ras = rimg->getRaster()->clone();  // Yep, this may be necessary

      else {

        TRaster32P rout(chipSize);

        TRop::resample(rout, rimg->getRaster(),

                       TScale((double)chipSize.lx / size.lx,

                              (double)chipSize.ly / size.ly));

        TRop::addBackground(rout, TPixel::White);

        ras = rout;

      }

      image = new QImage(chipSize.lx, chipSize.ly, QImage::Format_RGB32);

      convertRaster32ToImage(ras, image);

    } else

      assert(!"unsupported type for custom styles!");

    m_data.m_patternName = m_fp.getName();

    m_data.m_isVector    = (m_fp.getType() == "pli" || m_fp.getType() == "svg");

    m_data.m_image       = image;

  } catch (...) {

  }

}

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

void CustomStyleManager::StyleLoaderTask::onFinished(

    TThread::RunnableP sender) {

  // On the main thread...

  if (m_data.m_image)  // Everything went ok

  {

    m_manager->m_patterns.push_back(m_data);

    emit m_manager->patternAdded();

  }

}

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

//    CustomStyleManager implementation

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

CustomStyleManager::CustomStyleManager(const TFilePath &stylesFolder,

                                       QString filters, QSize chipSize)

    : m_stylesFolder(stylesFolder), m_filters(filters), m_chipSize(chipSize) {

  m_executor.setMaxActiveTasks(1);

}

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

int CustomStyleManager::getPatternCount() { return m_patterns.size(); }

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

CustomStyleManager::PatternData CustomStyleManager::getPattern(int index) {

  return (index < 0 || index >= m_patterns.size()) ? PatternData()

                                                   : m_patterns[index];

}

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

TFilePath CustomStyleManager::getRootPath() { return ::rootPath; }

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

void CustomStyleManager::setRootPath(const TFilePath &rootPath) {

  ::rootPath = rootPath;

}

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

void CustomStyleManager::loadItems() {

  // Build the folder to be read

  const TFilePath &rootFP(getRootPath());

  assert(rootFP != TFilePath());

  if (rootFP == TFilePath()) return;

  QDir patternDir(

      QString::fromStdWString((rootFP + m_stylesFolder).getWideString()));

  patternDir.setNameFilters(m_filters.split(' '));

  // Read the said folder

  TFilePathSet fps;

  try {

    TSystem::readDirectory(fps, patternDir);

  } catch (...) {

    return;

  }

  // Delete patterns no longer in the folder

  TFilePathSet newFps;

  TFilePathSet::iterator it;

  int i;

  for (i = 0; i < m_patterns.size(); i++) {

    PatternData data = m_patterns.at(i);

    for (it = fps.begin(); it != fps.end(); ++it) {

      if (data.m_patternName == it->getName() &&

          data.m_isVector == (it->getType() == "pli"))

        break;

    }

    if (it == fps.end()) {

      m_patterns.removeAt(i);

      i--;

    } else

      fps.erase(it);  // The style is not new, so don't generate tasks for it

  }

  // For each (now new) file entry, generate a fetching task

  for (TFilePathSet::iterator it = fps.begin(); it != fps.end(); it++)

    m_executor.addTask(new StyleLoaderTask(this, *it));

}