//===========================================
//  Lumina Desktop source code
//  Copyright (c) 2017-2018, Ken Moore
//  Available under the 3-clause BSD license
//  See the LICENSE file for full details
//===========================================
#include "mainUI.h"
#include "ui_mainUI.h"

#include <QPainter>
#include <QImage>
#include <QSize>
#include <QFileDialog>
#include <QInputDialog>
#include <QDebug>
#include <QApplication>
#include <QScreen>
#include <QtConcurrent>
#include <QSplitter>

#include <LuminaXDG.h>
#include "PrintWidget.h"

MainUI::MainUI() : QMainWindow(), ui(new Ui::MainUI()){
  ui->setupUi(this);
  //this->setWindowTitle(tr("Lumina PDF Viewer"));
  this->setWindowIcon( LXDG::findIcon("application-pdf","unknown"));
  presentationLabel = 0;
  CurrentPage = 1;
  lastdir = QDir::homePath();
  BACKEND = new Renderer();

  //Create the interface widgets
  PROPDIALOG = new PropDialog(BACKEND);
  BOOKMARKS = new BookmarkMenu(BACKEND, ui->splitter);
  BOOKMARKS->setContextMenuPolicy(Qt::CustomContextMenu);
  WIDGET = new PrintWidget(BACKEND, ui->splitter);
  WIDGET->setContextMenuPolicy(Qt::CustomContextMenu);
  ui->splitter->setCollapsible(0, true);
  ui->splitter->setCollapsible(1, false);
  clockTimer = new QTimer(this);
    clockTimer->setInterval(1000); //1-second updates to clock
    connect(clockTimer, SIGNAL(timeout()), this, SLOT(updateClock()) );
  label_clock = new QLabel(this);
    label_clock->setAlignment(Qt::AlignCenter );
    label_clock->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
    label_clock->setStyleSheet("QLabel{color: palette(highlight-text); background-color: palette(highlight); border-radius: 5px; }");
  label_page = new QLabel(this);
    label_page->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
    label_page->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Preferred);

  contextMenu = new QMenu(this);
    connect(contextMenu, SIGNAL(aboutToShow()), this, SLOT(updateContextMenu()));

  connect(WIDGET, SIGNAL(customContextMenuRequested(const QPoint&)),this, SLOT(showContextMenu(const QPoint&)) );
  connect(WIDGET, SIGNAL(currentPageChanged()), this, SLOT(updatePageNumber()) );
  connect(BACKEND, SIGNAL(PageLoaded(int)), this, SLOT(slotPageLoaded(int)) );
	connect(BACKEND, SIGNAL(reloadPages(int)), this, SLOT(startLoadingPages(int)));
	connect(BACKEND, SIGNAL(goToPosition(int, float, float)), WIDGET, SLOT(goToPosition(int, float, float)));
  connect(ui->splitter, &QSplitter::splitterMoved, this, [=]() {
    double percent = qBound(0.0, (ui->splitter->sizes().first()/(double)this->width())*100.0, 33.3); ui->splitter->setSizes( QList<int>() << this->width()*(percent/100.0) << this->width() * ((100.0-percent)/100.0)); });

  PrintDLG = new QPrintDialog(this);
  connect(PrintDLG, SIGNAL(accepted(QPrinter*)), this, SLOT(paintToPrinter(QPrinter*)) );
  //connect(ui->menuStart_Presentation, SIGNAL(triggered(QAction*)), this, SLOT(slotStartPresentation(QAction*)) );

  //Create the other interface widgets
  progress = new QProgressBar(this);
    progress->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
    progress->setFormat("%v/%m (%p%)"); // [current]/[total]
  progAct = ui->toolBar->addWidget(progress);
    progAct->setVisible(false);
  clockAct = ui->toolBar->addWidget(label_clock);
    clockAct->setVisible(false);
  pageAct = ui->toolBar->addWidget(label_page);
    pageAct->setVisible(false);

  //Put the various actions into logical groups
  QActionGroup *tmp = new QActionGroup(this);
    tmp->setExclusive(true);
    tmp->addAction(ui->actionFit_Width);
    tmp->addAction(ui->actionFit_Page);
  ui->actionFit_Page->setChecked(true);

  tmp = new QActionGroup(this);
    tmp->setExclusive(true);
    tmp->addAction(ui->actionSingle_Page);
    tmp->addAction(ui->actionDual_Pages);
    tmp->addAction(ui->actionAll_Pages);
  ui->actionSingle_Page->setChecked(true);

  //Connect up the buttons
  connect(ui->actionClose, SIGNAL(triggered()), this, SLOT(close()) );
  connect(ui->actionPrint, SIGNAL(triggered()), PrintDLG, SLOT(open()) );
  connect(ui->actionFit_Width, SIGNAL(triggered()), WIDGET, SLOT(fitToWidth()) );
  connect(ui->actionFit_Page, SIGNAL(triggered()), WIDGET, SLOT(fitView()) );
  connect(ui->actionOpen_PDF, SIGNAL(triggered()), this, SLOT(OpenNewFile()) );
  connect(ui->actionSingle_Page, SIGNAL(triggered()), WIDGET, SLOT(setSinglePageViewMode()) );
  connect(ui->actionDual_Pages, SIGNAL(triggered()), WIDGET, SLOT(setFacingPagesViewMode()) );
  connect(ui->actionAll_Pages, SIGNAL(triggered()), WIDGET, SLOT(setAllPagesViewMode()) );
  //connect(ui->actionScroll_Mode,  &QAction::triggered, this, [&] { this->setScroll(true); });
  //connect(ui->actionSelect_Mode, &QAction::triggered, this, [&] { this->setScroll(false); });
  connect(ui->actionZoom_In,  &QAction::triggered, WIDGET, [&] { WIDGET->zoomIn(1.2);  });
  connect(ui->actionZoom_Out, &QAction::triggered, WIDGET, [&] { WIDGET->zoomOut(1.2); });
  connect(ui->actionRotate_Counterclockwise, &QAction::triggered, this, [&] { if(results.size() != 0) { foreach(TextData *x, results) { x->highlighted(false); } } BACKEND->setDegrees(-90); });
  connect(ui->actionRotate_Clockwise, &QAction::triggered, this, [&] { if(results.size() != 0) { foreach(TextData *x, results) { x->highlighted(false); } } BACKEND->setDegrees(90); });
  connect(ui->actionZoom_In_2,  &QAction::triggered, WIDGET, [&] { WIDGET->zoomIn(1.2);  });
  connect(ui->actionZoom_Out_2, &QAction::triggered, WIDGET, [&] { WIDGET->zoomOut(1.2); });
  connect(ui->actionFirst_Page, SIGNAL(triggered()), this, SLOT(firstPage()) );
  connect(ui->actionPrevious_Page, SIGNAL(triggered()), this, SLOT(prevPage()) );
  connect(ui->actionNext_Page, SIGNAL(triggered()), this, SLOT(nextPage()) );
  connect(ui->actionLast_Page, SIGNAL(triggered()), this, SLOT(lastPage()) );
  connect(ui->actionProperties, &QAction::triggered, WIDGET, [&] { PROPDIALOG->show(); });
  connect(BACKEND, &Renderer::OrigSize, this, [&](QSizeF _pageSize) { pageSize = _pageSize; });
  connect(ui->actionFind, &QAction::triggered, this, [&] {
    if(ui->findGroup->isVisible()) {
      ui->findGroup->setVisible(false);
      this->setFocus();
    }else{
      ui->findGroup->setVisible(true);
      ui->findGroup->setFocus();
    }
  });
  connect(ui->actionFind_Next,  &QAction::triggered, this,
    [&] { find(ui->textEdit->text(), true); });
  connect(ui->actionFind_Previous,  &QAction::triggered, this,
    [&] { find(ui->textEdit->text(), false); });
  connect(ui->findNextB,  &QPushButton::clicked, this,
    [&] { find(ui->textEdit->text(), true); });
  connect(ui->findPrevB,  &QPushButton::clicked, this,
    [&] { find(ui->textEdit->text(), false); });
  connect(ui->matchCase, &QPushButton::clicked, this,
    [&] (bool value) { this->matchCase = value; });
  connect(ui->closeFind, &QPushButton::clicked, this,
    [&] { ui->findGroup->setVisible(false); this->setFocus(); });
  connect(ui->actionClearHighlights,  &QAction::triggered, WIDGET,
    [&] { WIDGET->updatePreview(); });
  connect(ui->actionBookmarks, &QAction::triggered, this, [=] () { ui->splitter->setSizes( QList<int>() << this->width()/4 << 3*this->width()/4); });

  //int curP = WIDGET->currentPage()-1; //currentPage reports pages starting at 1
  //int lastP = numPages-1;
  ui->actionFirst_Page->setText(tr("First Page"));
  ui->actionPrevious_Page->setText(tr("Previous Page"));
  ui->actionNext_Page->setText(tr("Next Page"));
  ui->actionLast_Page->setText(tr("Last Page"));
  /*ui->actionFirst_Page->setEnabled(curP!=0);
  ui->actionPrevious_Page->setEnabled(curP>0);
  ui->actionNext_Page->setEnabled(curP<lastP);
  ui->actionLast_Page->setEnabled(curP!=lastP);*/

  ui->actionStart_Here->setText(tr("Start Presentation (current slide)"));
  connect(ui->actionStart_Here, SIGNAL(triggered()), this, SLOT(startPresentationHere()) );
  ui->actionStart_Begin->setText(tr("Start Presentation (at beginning)"));
  connect(ui->actionStart_Begin, SIGNAL(triggered()), this, SLOT(startPresentationBeginning()) );
  ui->actionStop_Presentation->setText(tr("Stop Presentation"));
  connect(ui->actionStop_Presentation, SIGNAL(triggered()), this, SLOT(closePresentation()) );

  //Setup all the icons
  ui->actionPrint->setIcon( LXDG::findIcon("document-print",""));
  ui->actionClose->setIcon( LXDG::findIcon("window-close",""));
  ui->actionFit_Width->setIcon(LXDG::findIcon("transform-scale",""));
  ui->actionFit_Page->setIcon(LXDG::findIcon("zoom-fit-best",""));
  ui->actionOpen_PDF->setIcon(LXDG::findIcon("document-open",""));
  ui->actionSingle_Page->setIcon(LXDG::findIcon("format-view-agenda",""));
  ui->actionDual_Pages->setIcon(LXDG::findIcon("format-view-grid-small",""));
  ui->actionAll_Pages->setIcon(LXDG::findIcon("format-view-grid-large",""));
  ui->actionScroll_Mode->setIcon(LXDG::findIcon("cursor-pointer",""));
  ui->actionSelect_Mode->setIcon(LXDG::findIcon("cursor-text",""));
  ui->actionZoom_In->setIcon(LXDG::findIcon("zoom-in",""));
  ui->actionZoom_Out->setIcon(LXDG::findIcon("zoom-out",""));
  ui->actionZoom_In_2->setIcon(LXDG::findIcon("zoom-in",""));
  ui->actionZoom_Out_2->setIcon(LXDG::findIcon("zoom-out",""));
  ui->actionRotate_Counterclockwise->setIcon(LXDG::findIcon("object-rotate-left",""));
  ui->actionRotate_Clockwise->setIcon(LXDG::findIcon("object-rotate-right",""));
  ui->actionFirst_Page->setIcon(LXDG::findIcon("go-first",""));
  ui->actionPrevious_Page->setIcon(LXDG::findIcon("go-previous",""));
  ui->actionNext_Page->setIcon(LXDG::findIcon("go-next",""));
  ui->actionLast_Page->setIcon(LXDG::findIcon("go-last",""));
  ui->actionStart_Here->setIcon(LXDG::findIcon("media-playback-start-circled",""));
  ui->actionStart_Begin->setIcon(LXDG::findIcon("presentation-play",""));
  ui->actionStop_Presentation->setIcon(LXDG::findIcon("media-playback-stop-circled",""));
  ui->actionBookmarks->setIcon(LXDG::findIcon("bookmark-new",""));
  ui->actionFind->setIcon(LXDG::findIcon("edit-find",""));
  ui->actionFind_Next->setIcon(LXDG::findIcon("edit-find-next",""));
  ui->actionFind_Previous->setIcon(LXDG::findIcon("edit-find-prev",""));
  ui->actionProperties->setIcon(LXDG::findIcon("dialog-information",""));
  ui->actionSettings->setIcon(LXDG::findIcon("document-properties",""));
  ui->findNextB->setIcon(LXDG::findIcon("go-down-search"));
  ui->findPrevB->setIcon(LXDG::findIcon("go-up-search"));
  ui->actionClearHighlights->setIcon(LXDG::findIcon("format-text-clear",""));
  ui->findNextB->setIcon(LXDG::findIcon("go-down-search"));
  ui->matchCase->setIcon(LXDG::findIcon("format-text-italic"));
  ui->closeFind->setIcon(LXDG::findIcon("dialog-close"));

  //Now set the default state of the menu's and actions
  ui->actionStop_Presentation->setEnabled(false);
  ui->actionStart_Here->setEnabled(false);
  ui->actionStart_Begin->setEnabled(false);

  ui->findGroup->setVisible(false);

  //TESTING features/functionality
  bool TESTING = BACKEND->supportsExtraFeatures();
  ui->actionBookmarks->setEnabled(TESTING);
  ui->actionBookmarks->setVisible(TESTING);
  ui->actionProperties->setEnabled(TESTING);
  ui->actionProperties->setVisible(TESTING);
  ui->actionClearHighlights->setEnabled(TESTING);
  ui->actionClearHighlights->setVisible(TESTING);

  ui->actionSettings->setEnabled(false);
  ui->actionSettings->setVisible(false);
  ui->actionScroll_Mode->setEnabled(false);
  ui->actionScroll_Mode->setVisible(false);
  ui->actionSelect_Mode->setEnabled(false);
  ui->actionSelect_Mode->setVisible(false);
}

MainUI::~MainUI(){
  if(BOOKMARKS!=0){ BOOKMARKS->deleteLater(); }
  if(PROPDIALOG!=0) { PROPDIALOG->deleteLater(); }
  delete BACKEND;
}

void MainUI::loadFile(QString path){
  if(!QFile::exists(path) || path.isEmpty() ){ return; }
  QString password;
  bool ok = true;
    
  while( ok && !BACKEND->loadDocument(path, password) && BACKEND->needPassword() ){
    password = QInputDialog::getText(this, tr("Unlock PDF"), tr("Password:"), QLineEdit::Password, "", &ok);
    if(!ok){ break; } //cancelled
  }
  //Clear the current display

	WIDGET->setVisible(false);
  BOOKMARKS->setVisible(false);
  //Load the new document info
  this->setWindowTitle( BACKEND->title());
  if(BACKEND->needPassword()){ return; } //cancelled;
  qDebug() << " - Document Setup : start loading pages now";

  //Populate or repopulate the Bookmarks menu and Properties Dialog
  QTimer::singleShot(10, BOOKMARKS, SLOT(loadBookmarks()) );
  QTimer::singleShot(10, PROPDIALOG, SLOT(setInformation()) );
  QTimer::singleShot(50, [&]() { startLoadingPages(0); } );
}

QScreen* MainUI::getScreen(bool current, bool &cancelled){
  //Note: the "cancelled" boolian is actually an output - not an input
  QList<QScreen*> screens = QApplication::screens();
  cancelled = false;
  if(screens.length() ==1){ return screens[0]; } //only one option
  //Multiple screens available - figure it out
  if(current){
    //Just return the screen the window is currently on
    for(int i=0; i<screens.length(); i++){
      if(screens[i]->geometry().contains( this->mapToGlobal(this->pos()) )){
        return screens[i];
      }
    }
    //If it gets this far, there was an error and it should just return the primary screen
    return QApplication::primaryScreen();
  }else{
    //Ask the user to select a screen (for presentations, etc..)
    QStringList names;
    for(int i=0; i<screens.length(); i++){
      QString screensize = QString::number(screens[i]->size().width())+"x"+QString::number(screens[i]->size().height());
       names << QString(tr("%1 (%2)")).arg(screens[i]->name(), screensize);
    }
    bool ok = false;
    QString sel = QInputDialog::getItem(this, tr("Select Screen"), tr("Screen:"), names, 0, false, &ok);
    cancelled = !ok;
    if(!ok){ return screens[0]; } //cancelled - just return the first one
    int index = names.indexOf(sel);
    if(index < 0){ return screens[0]; } //error - should never happen though
    return screens[index]; //return the selected screen
  }
}

void MainUI::startPresentation(bool atStart){
  if(BACKEND->hashSize() == 0){ return; } //just in case
  bool cancelled = false;
  QScreen *screen = getScreen(false, cancelled); //let the user select which screen to use (if multiples)
  if(cancelled){ return;}
  int page = 1;
  if(!atStart){ page = WIDGET->currentPage(); }
  //PDPI = QSize(SCALEFACTOR*screen->physicalDotsPerInchX(), SCALEFACTOR*screen->physicalDotsPerInchY());
  //Now create the full-screen window on the selected screen
  if(presentationLabel == 0){
    //Create the label and any special flags for it
    presentationLabel = new PresentationLabel();
      presentationLabel->setStyleSheet("background-color: black;");
      presentationLabel->setAlignment(Qt::AlignCenter);
      presentationLabel->setContextMenuPolicy(Qt::CustomContextMenu);
      connect(presentationLabel, SIGNAL(customContextMenuRequested(const QPoint&)), this, SLOT(showContextMenu(const QPoint&)) );
      connect(presentationLabel, SIGNAL(nextSlide()), this, SLOT(nextPage()) );
  }
  //Now put the label in the proper location
  presentationLabel->setGeometry(screen->geometry());
  presentationLabel->showFullScreen();

  ui->actionStop_Presentation->setEnabled(true);
  ui->actionStart_Here->setEnabled(false);
  ui->actionStart_Begin->setEnabled(false);
  updateClock();
  updatePageNumber();
  clockAct->setVisible(true);
  clockTimer->start();
  QApplication::processEvents();
  //Now start at the proper page
  ShowPage(page);
  this->grabKeyboard(); //Grab any keyboard events - even from the presentation window
}

void MainUI::ShowPage(int page){
  //Check for valid document/page
  //qDebug() << "Load Page:" << page << "/" << BACKEND->numPages() << "Index:" << page;
  if(page <= 0 || page > BACKEND->numPages() || (page==BACKEND->numPages() && CurrentPage==page) ){
    endPresentation();
    return; //invalid - no document loaded or invalid page specified
  }
  WIDGET->setCurrentPage(page); //page numbers start at 1 for this widget
  //Stop here if no presentation currently running

  if(presentationLabel == 0 || !presentationLabel->isVisible()){ return; }
  //qDebug() << "Show Page:" << page << "/" << numPages;
  CurrentPage = page;
  QImage PAGEIMAGE;
  if(page<BACKEND->numPages()+1){ PAGEIMAGE = BACKEND->imageHash(page-1); }

  //Now scale the image according to the user-designations and show it
  if(!PAGEIMAGE.isNull()){
    QPixmap pix;
    pix.convertFromImage( PAGEIMAGE.scaled( presentationLabel->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation) );
    presentationLabel->setPixmap(pix);
    presentationLabel->show(); //always make sure it was not hidden
  }else{
    //Blank page (useful so there is one blank page after the last slide before stopping the presentation)
    presentationLabel->setPixmap(QPixmap());
  }
}

void MainUI::endPresentation(){
  if(presentationLabel==0 || !presentationLabel->isVisible()){ return; } //not in presentation mode
  presentationLabel->hide(); //just hide this (no need to re-create the label for future presentations)
  ui->actionStop_Presentation->setEnabled(false);
  ui->actionStart_Here->setEnabled(true);
  ui->actionStart_Begin->setEnabled(true);
  clockTimer->stop();
  clockAct->setVisible(false);
  this->releaseKeyboard();
  updatePageNumber();
}

void MainUI::startLoadingPages(int degrees){
  qDebug() <<"Start Loading Pages";
  //if(BACKEND->hashSize() != 0) { return; } //currently loaded[ing]
  loadingQueue.clear();
	BACKEND->clearHash();
  WIDGET->setVisible(false);
  BOOKMARKS->setVisible(false);
  //qDebug() << "Update Progress Bar";
  progress->setRange(0, BACKEND->numPages());
  progress->setValue(0);
  progAct->setVisible(true);
  pageAct->setVisible(false);
  //PERFORMANCE NOTES:
  // Using Poppler to scale the image (adjust dpi value) helps a bit but you take a larger CPU loading hit (and still quite a lot of pixelization)
  // Using Qt to scale the image (adjust page value) smooths out the image quite a bit without a lot of performance loss (but cannot scale up without pixelization)
  // The best approach seams to be to increase the DPI a bit, but match that with the same scaling on the page size (smoothing)

  QSize DPI(150,150); //print-quality (some printers even go to 600 DPI nowdays)

  /*qDebug() << "Screen Resolutions:";
  QList<QScreen*> screens = QApplication::screens();
  for(int i=0; i<screens.length(); i++){
    qDebug() << screens[i]->name() << screens[i]->logicalDotsPerInchX() << screens[i]->logicalDotsPerInchY();
  }*/

  for(int i=0; i<BACKEND->numPages(); i++){
    //qDebug() << " - Kickoff page load:" << i;
    if(BACKEND->loadMultiThread()) {
      QtConcurrent::run(BACKEND, &Renderer::renderPage, i, DPI, degrees);
    }else{
      BACKEND->renderPage(i, DPI, degrees);
      if(i % 50 == 0){ QCoreApplication::processEvents(); }
    }
  }
  //qDebug() << "Finish page loading kickoff";
}

void MainUI::slotPageLoaded(int page){
  loadingQueue.push_back(page);
  int finished = loadingQueue.size();
  //qDebug() << "Page Loaded:" << page << finished;
  if(finished == BACKEND->numPages()){
    progAct->setVisible(false);
    WIDGET->setVisible(true);
    BOOKMARKS->setVisible(true);
    ui->splitter->setSizes(QList<int>() << 0 << this->width());
    WIDGET->setCurrentPage(1);
    ui->actionStop_Presentation->setEnabled(false);
    ui->actionStart_Here->setEnabled(true);
    ui->actionStart_Begin->setEnabled(true);
    pageAct->setVisible(true);
    PROPDIALOG->setSize(pageSize);
    qDebug() << " - Document Setup: All pages loaded";
    QTimer::singleShot(10, WIDGET, SLOT(updatePreview())); //start loading the file preview
  }else{
    progress->setValue(finished);
  }
}

void MainUI::paintToPrinter(QPrinter *PRINTER){
  if(BACKEND->hashSize() != BACKEND->numPages()){ return; }
  //qDebug() << "paintToPrinter";
  int pages = BACKEND->numPages();
  int firstpage = 0;
  int copies = PRINTER->copyCount();
  bool collate = PRINTER->collateCopies();
  bool reverse = (PRINTER->pageOrder()==QPrinter::LastPageFirst);
  qDebug() << "PRINTER DPI:" << PRINTER->resolution() << PRINTER->supportedResolutions();
  if(PRINTER->resolution() < 300){
    //Try to get 300 DPI resolution at least
    PRINTER->setResolution(300);
    qDebug() << "Trying to change print resolution to 300 minimum";
    qDebug() << "  -- Resolutions listed as supported:" << PRINTER->supportedResolutions();
  }
  //bool duplex = (PRINTER->duplex()!=QPrinter::DuplexNone);
  //Determine the first page that needs to be printed, and the range
  if((PRINTER->fromPage() != PRINTER->toPage() || PRINTER->fromPage()!=0 ) && PRINTER->printRange()==QPrinter::PageRange ){
    firstpage = PRINTER->fromPage() - 1;
    pages = PRINTER->toPage();
  }
  qDebug() << "Start Printing PDF: Pages" << PRINTER->fromPage() <<" to "<< PRINTER->toPage()<< " Copies:" << copies << "  collate:" << collate << " Reverse Order:" << reverse;
  QList<int> pageCount;
  //Assemble the page order/count based on printer settings
  for(int i=firstpage; i<pages; i++){
    //Make sure even/odd pages are not selected as desired
    //Qt 5.7.1 does not seem to have even/odd page selections - 8/11/2017
    pageCount << i; //add this page to the list
    //QT 5.9+ : Do not need to manually stack "copies". Already handled internally
    //for(int c=1; c<copies && !collate; c++){ pageCount << i; } //add any copies of this page as needed
  }
  //qDebug() << "Got Page Range:" << pageCount;
  //QT 5.9+ : Do not need to manually reverse the pages (already handled internally)
  if(reverse) {
    //Need to reverse the order of the list
    QList<int> tmp = pageCount;
    pageCount.clear();
    for(int i=tmp.length()-1; i>=0; i--){ pageCount << tmp[i]; }
    //qDebug() << " - reversed:" << pageCount;
  }
  //QT 5.9+ : Do not need to manually stack "copies". Already handled internally;
  /*if(collate && copies>0){
    QList<int> orig = pageCount; //original array of pages
    for(int c=1; c<copies; c++){
      pageCount << orig; //add a new copy of the entire page range
    }
  }*/
  //qDebug() << "Final Page Range:" << pageCount;
  //Generate the sizing information for the printer
  QSize sz(PRINTER->pageRect().width(), PRINTER->pageRect().height());
  bool landscape = PRINTER->orientation()==QPrinter::Landscape;
  if(landscape){ sz = QSize(sz.height(), sz.width() ); } //flip the size dimensions as needed
  //Now send out the pages in the right order/format
  QPainter painter(PRINTER);
    //Ensure all the antialiasing/smoothing options are turned on
    painter.setRenderHint(QPainter::Antialiasing);
    painter.setRenderHint(QPainter::TextAntialiasing);
    painter.setRenderHint(QPainter::SmoothPixmapTransform);

  QTransform transF;
  transF.rotate(90);
  //Show the progress bar
  progAct->setVisible(true);
  progress->setRange(0, pageCount.length()-1);
  for(int i=0; i<pageCount.length(); i++){
    if(i!=0){ PRINTER->newPage(); }
    //qDebug() << "Printing Page:" << pageCount[i];
    progress->setValue(i);
    QApplication::processEvents();
    QImage img = BACKEND->imageHash(pageCount[i]).scaled(sz, Qt::KeepAspectRatio, Qt::SmoothTransformation);
    //Now draw the image
    painter.drawImage(0,0,img);
  }
  progAct->setVisible(false);
}

void MainUI::OpenNewFile(){
  //Prompt for a file
  QString path = QFileDialog::getOpenFileName(this, tr("Open PDF"), lastdir, tr("PDF Documents (*.pdf)"));
  //Now Open it
  if(!path.isEmpty()){ loadFile(path); }
}

void MainUI::updateClock(){
  label_clock->setText( QDateTime::currentDateTime().toString("<b>hh:mm:ss</b>") );
}

void MainUI::updatePageNumber(){
  //qDebug() << "UpdatePageNumber";
  QString text;
  if(presentationLabel==0 || !presentationLabel->isVisible()){ text = tr("Page %1 of %2"); }
  else{ text = "%1/%2"; }
  label_page->setText( text.arg( QString::number(WIDGET->currentPage()), QString::number(BACKEND->numPages()) ));
}

/*void MainUI::setScroll(bool tog) {
  if(tog) {
    QApplication::setOverrideCursor(Qt::OpenHandCursor);
  }else{
    QApplication::setOverrideCursor(Qt::IBeamCursor);
  }
}*/

void MainUI::updateContextMenu(){
  //qDebug() << "UpdateContextMenu";
  contextMenu->clear();
  contextMenu->addSection( QString(tr("Page %1 of %2")).arg(QString::number(WIDGET->currentPage()),
    QString::number(BACKEND->numPages()) ) );
  contextMenu->addAction(ui->actionPrevious_Page);
  contextMenu->addAction(ui->actionNext_Page);
  contextMenu->addSeparator();
  contextMenu->addAction(ui->actionFirst_Page);
  contextMenu->addAction(ui->actionLast_Page);
  contextMenu->addSeparator();
  if(presentationLabel==0 || !presentationLabel->isVisible()){
    contextMenu->addAction(ui->actionStart_Begin);
    contextMenu->addAction(ui->actionStart_Here);
  }else{
    contextMenu->addAction(ui->actionStop_Presentation);
  }
}

void MainUI::keyPressEvent(QKeyEvent *event){
  //See if this is one of the special hotkeys and act appropriately
  bool inPresentation = (presentationLabel!=0);
  if( event->key()==Qt::Key_Escape || event->key()==Qt::Key_Backspace){
    if(inPresentation){ endPresentation(); }
  }else if(event->key()==Qt::Key_Right || event->key()==Qt::Key_Space ||
  event->key()==Qt::Key_PageDown){
    nextPage();
  }else if(event->key()==Qt::Key_Left || event->key()==Qt::Key_PageUp){
    prevPage();
  }else if(event->key()==Qt::Key_Home){
    firstPage();
  }else if(event->key()==Qt::Key_End){
    lastPage();
  }else if(event->key()==Qt::Key_F11){
    if(inPresentation){ endPresentation(); }
    else{ startPresentationHere(); }
  }else if(event->key() == Qt::Key_Up) {
    //Scroll the widget up
  }else if(event->key() == Qt::Key_Down) {
    //Scroll the widget down
    /*qDebug() << "Send Wheel Event";
    QWheelEvent wEvent( WIDGET->mapFromGlobal(QCursor::pos()), QCursor::pos(),QPoint(0,0), QPoint(0,30), 0, Qt::Vertical, Qt::LeftButton, Qt::NoModifier);
    QApplication::sendEvent(WIDGET, &wEvent);*/
  }else if(event->key() == Qt::Key_Enter) {
    /*if(ui->findGroup->hasFocus()) {
      find(ui->textEdit->text(), true);
    }*/
  }else{
    QMainWindow::keyPressEvent(event);
  }
}

void MainUI::wheelEvent(QWheelEvent *event) {
  //Scroll the window according to the mouse wheel
  QMainWindow::wheelEvent(event);
}

void MainUI::find(QString text, bool forward) {
  if(!text.isEmpty()) {
    static bool previousMatchCase = matchCase;
    //qDebug() << "Finding Text";
    //Detemine if it is the first time searching or a new search string
    bool newSearch = results.empty() || !(results[0]->text() == text);

    //Also search again if match case is turned on/off
    if(previousMatchCase != matchCase) {
      newSearch = true;
      previousMatchCase = matchCase;
    }

    //Clear results and highlights if the user gives a new search string
    if(newSearch) {
      //clear out the old results
      if(!results.empty()) {
        foreach (TextData* td, results)
          delete td;
        results.clear();
      }
      WIDGET->updatePreview();
      ui->resultsLabel->setText("");
      //Get the new search results
      results = BACKEND->searchDocument(text, matchCase);
      //qDebug() << "Total Results: " << results.size();
      currentHighlight = (forward) ? -1 : results.size();
    }

    //qDebug() << "Jumping to next result";
    if(!results.empty()) {
      //Jump to the location of the next or previous textbox and highlight
      if(forward) {
        currentHighlight++;
        if(currentHighlight >= results.size())
        currentHighlight %= results.size();
      }else{
        currentHighlight--;
        //Ensure currentHighlight will be between 0 and results.size() - 1
        if(currentHighlight < 0)
          currentHighlight = results.size() - 1;
      }


      ui->resultsLabel->setText(QString::number(currentHighlight+1) + " of " + QString::number(results.size()) + " results");

      TextData *currentText = results[currentHighlight];

      if(BACKEND->supportsExtraFeatures())
        WIDGET->highlightText(currentText);
    }else{
      ui->resultsLabel->setText("No results found");
    }
  }
}