#include "toonzqt/planeviewer.h"

// TnzQt includes

#include "toonzqt/imageutils.h"

// TnzLib includes

#include "toonz/stage.h"

// TnzCore includes

#include "trasterimage.h"

#include "ttoonzimage.h"

#include "tvectorimage.h"

#include "trop.h"

#include "tvectorrenderdata.h"

#include "tgl.h"

#include "tvectorgl.h"

#include "tpalette.h"

// Qt includes

#include <qmouseevent></qmouseevent>

#include <qwheelevent></qwheelevent>

#include <qresizeevent></qresizeevent>

#include <qhideevent></qhideevent>

//#define PRINT_AFF

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

//    Local namespace  stuff

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

namespace {

struct PlaneViewerZoomer : public ImageUtils::ShortcutZoomer {

  PlaneViewerZoomer(PlaneViewer *planeViewer) : ShortcutZoomer(planeViewer) {}

private:

  bool zoom(bool zoomin, bool resetZoom) override;

};

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

bool PlaneViewerZoomer::zoom(bool zoomin, bool resetZoom) {

  PlaneViewer &planeViewer = static_cast<planeviewer &="">(*getWidget());</planeviewer>

  resetZoom ? planeViewer.resetView()

            : zoomin ? planeViewer.zoomIn() : planeViewer.zoomOut();

  return true;

}

}  // namespace

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

PlaneViewer::PlaneViewer(QWidget *parent)

    : QOpenGLWidget(parent)

    , m_firstResize(true)

    , m_xpos(0)

    , m_ypos(0)

    , m_aff()  // initialized at the first resize

    , m_chessSize(40.0) {

  m_zoomRange[0] = 1e-3, m_zoomRange[1] = 1024.0;

  setBgColor(TPixel32(235, 235, 235), TPixel32(235, 235, 235));

}

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

void PlaneViewer::setZoomRange(double zoomMin, double zoomMax) {

  m_zoomRange[0] = zoomMin, m_zoomRange[1] = zoomMax;

}

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

void PlaneViewer::setBgColor(const TPixel32 &color1, const TPixel32 &color2) {

  m_bgColorF[0] = color1.r / 255.0, m_bgColorF[1] = color1.g / 255.0,

  m_bgColorF[2] = color1.b / 255.0;

  m_bgColorF[3] = color2.r / 255.0, m_bgColorF[4] = color2.g / 255.0,

  m_bgColorF[5] = color2.b / 255.0;

}

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

void PlaneViewer::getBgColor(TPixel32 &color1, TPixel32 &color2) const {

  color1.r = m_bgColorF[0] * 255.0, color1.g = m_bgColorF[1] * 255.0,

  color1.b = m_bgColorF[2] * 255.0;

  color2.r = m_bgColorF[3] * 255.0, color2.g = m_bgColorF[4] * 255.0,

  color2.b = m_bgColorF[5] * 255.0;

}

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

void PlaneViewer::drawBackground() {

  glClearColor(m_bgColorF[0], m_bgColorF[1], m_bgColorF[2], 1.0);

  glClear(GL_COLOR_BUFFER_BIT);

  if (m_bgColorF[0] != m_bgColorF[3] || m_bgColorF[1] != m_bgColorF[4] ||

      m_bgColorF[2] != m_bgColorF[5]) {

    // Cast the widget rect to world rect

    TRectD rect(winToWorld(0, 0), winToWorld(width(), height()));

    // Deduce chess geometry

    TRect chessRect(tfloor(rect.x0 / m_chessSize),

                    tfloor(rect.y0 / m_chessSize), tceil(rect.x1 / m_chessSize),

                    tceil(rect.y1 / m_chessSize));

    // Draw chess squares

    glColor3f(m_bgColorF[3], m_bgColorF[4], m_bgColorF[5]);

    glBegin(GL_QUADS);

    int x, y;

    TPointD pos;

    double chessSize2 = 2.0 * m_chessSize;

    for (y = chessRect.y0; y < chessRect.y1; ++y) {

      pos.y = y * m_chessSize;

      for (x = chessRect.x0 + ((chessRect.x0 + y) % 2), pos.x = x * m_chessSize;

           x < chessRect.x1; x += 2, pos.x += chessSize2) {

        glVertex2d(pos.x, pos.y);

        glVertex2d(pos.x + m_chessSize, pos.y);

        glVertex2d(pos.x + m_chessSize, pos.y + m_chessSize);

        glVertex2d(pos.x, pos.y + m_chessSize);

      }

    }

    glEnd();

  }

}

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

void PlaneViewer::initializeGL() {}

void PlaneViewer::resizeGL(int width, int height) {

  glViewport(0, 0, width, height);

  glMatrixMode(GL_PROJECTION);

  glLoadIdentity();

  gluOrtho2D(0, width, 0, height);

  glMatrixMode(GL_MODELVIEW);

  glLoadIdentity();

  if (m_firstResize) {

    m_firstResize = false;

    m_aff         = TTranslation(0.5 * width, 0.5 * height);

    m_width       = width;

    m_height      = height;

  } else {

    TPointD oldCenter(m_width * 0.5, m_height * 0.5);

    TPointD newCenter(width * 0.5, height * 0.5);

    m_aff    = m_aff.place(m_aff.inv() * oldCenter, newCenter);

    m_width  = width;

    m_height = height;

  }

}

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

void PlaneViewer::mouseMoveEvent(QMouseEvent *event) {

  if (event->buttons() & Qt::MidButton)

    moveView(event->x() - m_xpos, height() - event->y() - m_ypos);

  m_xpos = event->x(), m_ypos = height() - event->y();

}

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

void PlaneViewer::mousePressEvent(QMouseEvent *event) {

  m_xpos = event->x(), m_ypos = height() - event->y();

}

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

void PlaneViewer::wheelEvent(QWheelEvent *event) {

  TPointD pos(event->x(), height() - event->y());

  double zoom_par = 1 + event->delta() * 0.001;

  zoomView(pos.x, pos.y, zoom_par);

}

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

void PlaneViewer::keyPressEvent(QKeyEvent *event) {

  if (PlaneViewerZoomer(this).exec(event)) return;

  QOpenGLWidget::keyPressEvent(event);

}

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

//! Disposes of the auxiliary internal rasterBuffer().

void PlaneViewer::hideEvent(QHideEvent *event) {

  m_rasterBuffer = TRaster32P();

}

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

void PlaneViewer::resetView() {

  m_aff = TTranslation(0.5 * width(), 0.5 * height());

  update();

}

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

void PlaneViewer::setViewPos(double x, double y) {

  m_aff.a13 = x, m_aff.a23 = y;

  update();

#ifdef PRINT_AFF

  qDebug("zoom = %.4f;  pos = %.4f, %.4f", m_aff.a11, m_aff.a13, m_aff.a23);

#endif

}

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

void PlaneViewer::setViewZoom(double x, double y, double zoom) {

  zoom         = tcrop(zoom, m_zoomRange[0], m_zoomRange[1]);

  double delta = zoom / m_aff.a11;

  m_aff.a13 = x + delta * (m_aff.a13 - x);

  m_aff.a23 = y + delta * (m_aff.a23 - y);

  m_aff.a11 = m_aff.a22 = zoom;

  update();

#ifdef PRINT_AFF

  qDebug("zoom = %.4f;  pos = %.4f, %.4f", m_aff.a11, m_aff.a13, m_aff.a23);

#endif

}

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

void PlaneViewer::zoomIn() {

  setViewZoom(ImageUtils::getQuantizedZoomFactor(m_aff.a11, true));

}

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

void PlaneViewer::zoomOut() {

  setViewZoom(ImageUtils::getQuantizedZoomFactor(m_aff.a11, false));

}

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

void PlaneViewer::pushGLWorldCoordinates() {

  m_matrix[0]  = m_aff.a11;

  m_matrix[4]  = m_aff.a12;

  m_matrix[12] = m_aff.a13;

  m_matrix[1]  = m_aff.a21;

  m_matrix[5]  = m_aff.a22;

  m_matrix[13] = m_aff.a23;

  m_matrix[2] = m_matrix[3] = m_matrix[6] = m_matrix[7] = m_matrix[8] =

      m_matrix[9] = m_matrix[10] = m_matrix[11] = m_matrix[14] = 0;

  m_matrix[15] = 1.0;

  glPushMatrix();

  glLoadMatrixd(m_matrix);  //(GLdouble*) &m_matrix

}

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

void PlaneViewer::pushGLWinCoordinates() {

  glPushMatrix();

  glLoadIdentity();

}

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

void PlaneViewer::popGLCoordinates() { glPopMatrix(); }

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

TRaster32P PlaneViewer::rasterBuffer() {

  if (!m_rasterBuffer || m_rasterBuffer->getLx() != width() ||

      m_rasterBuffer->getLy() != height())

    m_rasterBuffer = TRaster32P(width(), height());

  return m_rasterBuffer;

}

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

void PlaneViewer::flushRasterBuffer() {

  assert(m_rasterBuffer);

  glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);

  glRasterPos2d(0, 0);

  glDrawPixels(width(), height(), TGL_FMT, TGL_TYPE,

               m_rasterBuffer->getRawData());

}

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

void PlaneViewer::draw(TRasterP ras, double dpiX, double dpiY, TPalette *pal) {

  TPointD rasCenter(ras->getCenterD());

  TRaster32P aux(rasterBuffer());

  aux->lock();

  ras->lock();

  glGetDoublev(GL_MODELVIEW_MATRIX, m_matrix);

  TAffine viewAff(m_matrix[0], m_matrix[4], m_matrix[12], m_matrix[1],

                  m_matrix[5], m_matrix[13]);

  viewAff = viewAff * TScale(Stage::inch / dpiX, Stage::inch / dpiY) *

            TTranslation(-rasCenter);

  pushGLWinCoordinates();

  aux->clear();

  if (pal)

    TRop::quickPut(aux, (TRasterCM32P)ras, pal, viewAff);

  else

    TRop::quickPut(aux, ras, viewAff);

  flushRasterBuffer();

  popGLCoordinates();

}

/*NOTE:

    glRasterPos2d could be used, along glBitmap and glPixelZoom...

    however, i've never been able to use them effectively...

*/

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

void PlaneViewer::draw(TRasterImageP ri) {

  double dpiX, dpiY;

  ri->getDpi(dpiX, dpiY);

  if (dpiX == 0.0 || dpiY == 0.0) dpiX = dpiY = Stage::inch;

  draw(ri->getRaster(), dpiX, dpiY);

}

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

void PlaneViewer::draw(TToonzImageP ti) {

  double dpiX, dpiY;

  ti->getDpi(dpiX, dpiY);

  if (dpiX == 0.0 || dpiY == 0.0) dpiX = dpiY = Stage::inch;

  draw(ti->getRaster(), dpiX, dpiY, ti->getPalette());

}

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

void PlaneViewer::draw(TVectorImageP vi) {

  TRectD bbox(vi->getBBox());

  TRect bboxI(tfloor(bbox.x0), tfloor(bbox.y0), tceil(bbox.x1) - 1,

              tceil(bbox.y1) - 1);

  TVectorRenderData rd(TAffine(), bboxI, vi->getPalette(), 0, true, true);

  tglDraw(rd, vi.getPointer());

}

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

void PlaneViewer::draw(TImageP img) {

  {

    TRasterImageP ri(img);

    if (ri) {

      draw(ri);

      return;

    }

  }

  {

    TToonzImageP ti(img);

    if (ti) {

      draw(ti);

      return;

    }

  }

  {

    TVectorImageP vi(img);

    if (vi) {

      draw(vi);

      return;

    }

  }

}