/*
	Copyright 2006-2017 The QElectroTech Team
	This file is part of QElectroTech.
	
	QElectroTech is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 2 of the License, or
	(at your option) any later version.
	
	QElectroTech is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.
	
	You should have received a copy of the GNU General Public License
	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "diagramprintdialog.h"
#include "qetprintpreviewdialog.h"
#include <math.h>
#include "diagramschooser.h"
#include "exportproperties.h"
#include "qeticons.h"
#include "qetmessagebox.h"

#include <QPrinter>
#include <QPrintDialog>

/**
	Constructeur
	@param project Schema a imprimer
	@param parent  Widget parent du dialogue
*/
DiagramPrintDialog::DiagramPrintDialog(QETProject *project, QWidget *parent) :
	QWidget(parent),
	project_(project),
	dialog_(nullptr)
{
	// initialise l'imprimante
	printer_ = new QPrinter();
	
	// orientation paysage par defaut
	printer_ -> setOrientation(QPrinter::Landscape);
	backup_diagram_background_color = Diagram::background_color;
	Diagram::background_color = Qt::white;
}

/**
	Destructeur
*/
DiagramPrintDialog::~DiagramPrintDialog() {
	delete dialog_;
	delete printer_;
	Diagram::background_color = backup_diagram_background_color;
}

/**
	Definit le nom du PDF si l'utilisateur choisit une sortie vers un PDF
*/
void DiagramPrintDialog::setFileName(const QString &name) {
	file_name_ = name;
}

/**
	@return le nom du PDF
*/
QString DiagramPrintDialog::fileName() const {
	return(file_name_);
}

/**
	Definit le nom du document
*/
void DiagramPrintDialog::setDocName(const QString &name) {
	doc_name_ = name;
}

/**
	@return le nom du document
*/
QString DiagramPrintDialog::docName() const {
	return(doc_name_);
}

/**
	@param diagram Diagram to be printed
	@param include_titleblock (Optional, defaults to true) Whether the diagram
	titleblock should be printed.
	@return the rectangle to be printed
*/
QRect DiagramPrintDialog::diagramRect(Diagram *diagram, const ExportProperties &options) const {
	if (!diagram) return(QRect());
	
	QRectF diagram_rect = diagram -> border_and_titleblock.borderAndTitleBlockRect();
	if (!options.draw_titleblock) {
		qreal titleblock_height = diagram -> border_and_titleblock.titleBlockRect().height();
		diagram_rect.setHeight(diagram_rect.height() - titleblock_height);
	}
	
	// ajuste la bordure du schema d'un pixel (epaisseur du trait)
	diagram_rect = diagram_rect.adjusted(0.0, 0.0, 1.0, 1.0);
	
	return(diagram_rect.toAlignedRect());
}

/**
	Execute le dialogue d'impression
*/
void DiagramPrintDialog::exec() {
	
	// prise en compte du nom du document
	if (!doc_name_.isEmpty()) printer_ -> setDocName(doc_name_);
	printer_ -> setCreator(QString("QElectroTech %1").arg(QET::displayedVersion));
	
	// affichage d'un premier dialogue demandant a l'utilisateur le type
	// d'impression qu'il souhaite effectuer
	buildPrintTypeDialog();
	if (dialog_ -> exec() == QDialog::Rejected) return;
	
	// parametrage de l'imprimante en fonction du type d'impression choisi
	if (printer_choice_ -> isChecked()) {
		// affichage du dialogue d'impression standard pour parametrer l'imprimante
		QPrintDialog print_dialog(printer_, parentWidget());
#ifdef Q_OS_MAC
		print_dialog.setWindowFlags(Qt::Sheet);
#endif
		print_dialog.setWindowTitle(tr("Options d'impression", "window title"));
		print_dialog.setEnabledOptions(QAbstractPrintDialog::PrintShowPageSize);
		if (print_dialog.exec() == QDialog::Rejected) return;
	}
	else
	{
		printer_ -> setOutputFormat(QPrinter::PdfFormat);
		printer_ -> setOutputFileName(filepath_field_ -> text());
	}

	loadPageSetupForCurrentPrinter();
	
	//Preview before print
#if defined Q_OS_LINUX
	//Due to some bug with xfwm, we display this dialog has a windows on linux os (X11)
	//@TODO see if we must this line with graphic server wayland
	QETPrintPreviewDialog preview_dialog(project_, printer_, parentWidget(), Qt::Window);
#else
	QETPrintPreviewDialog preview_dialog(project_, printer_, parentWidget());
#endif
	connect(
		&preview_dialog,
		SIGNAL(paintRequested(const QList<Diagram *> &, bool, const ExportProperties, QPrinter *)),
		this,
		SLOT(print(const QList<Diagram *> &, bool, const ExportProperties))
	);
	DiagramsChooser *dc = preview_dialog.diagramsChooser();
	dc -> setSelectedAllDiagrams();
	if (preview_dialog.exec() == QDialog::Rejected) return;
	
	savePageSetupForCurrentPrinter();
	
	// effectue l'impression en elle-meme
	print(
		dc -> selectedDiagrams(),
		preview_dialog.fitDiagramsToPages(),
		preview_dialog.exportProperties()
	);
}

/**
	@param diagram Schema a imprimer
	@param options Rendering options
	@param fullpage true pour utiliser toute la feuille dans le calcul
	@return Le nombre de pages necessaires pour imprimer le schema
	avec l'orientation et le format papier utilise dans l'imprimante en cours.
*/
int DiagramPrintDialog::pagesCount(Diagram *diagram, const ExportProperties &options, bool fullpage) const {
	return(horizontalPagesCount(diagram, options, fullpage) * verticalPagesCount(diagram, options, fullpage));
}

/**
	@param diagram Schema a imprimer
	@param options Rendering options
	@param fullpage true pour utiliser toute la feuille dans le calcul
	@return La largeur du "poster" en nombre de pages pour imprimer le schema
	avec l'orientation et le format papier utilise dans l'imprimante en cours.
*/
int DiagramPrintDialog::horizontalPagesCount(Diagram *diagram, const ExportProperties &options, bool fullpage) const {
	// note : pageRect et Paper Rect tiennent compte de l'orientation du papier
	QRect printable_area = fullpage ? printer_ -> paperRect() : printer_ -> pageRect();
	QRect diagram_rect = diagramRect(diagram, options);
	
	int h_pages_count = int(ceil(qreal(diagram_rect.width()) / qreal(printable_area.width())));
	return(h_pages_count);
}

/**
	@param diagram Schema a imprimer
	@param options Rendering options
	@param fullpage true pour utiliser toute la feuille dans le calcul
	@return La largeur du "poster" en nombre de pages pour imprimer le schema
	avec l'orientation et le format papier utilise dans l'imprimante en cours.
*/
int DiagramPrintDialog::verticalPagesCount(Diagram *diagram, const ExportProperties &options, bool fullpage) const {
	// note : pageRect et Paper Rect tiennent compte de l'orientation du papier
	QRect printable_area = fullpage ? printer_ -> paperRect() : printer_ -> pageRect();
	QRect diagram_rect = diagramRect(diagram, options);
	
	int v_pages_count = int(ceil(qreal(diagram_rect.height()) / qreal(printable_area.height())));
	return(v_pages_count);
}

/**
	Construit un dialogue non standard pour demander a l'utilisateur quelle type
	d'impression il souhaite effectuer : PDF, PS ou imprimante physique
*/
void DiagramPrintDialog::buildPrintTypeDialog() {
	// initialisation des widgets
	dialog_           = new QDialog(parentWidget());
#ifdef Q_OS_MAC
	dialog_ -> setWindowFlags(Qt::Sheet);
#endif
	
	printtype_label_  = new QLabel(tr("Quel type d'impression désirez-vous effectuer ?"));
	printer_icon_     = new QLabel();
	pdf_icon_         = new QLabel();

	printtype_choice_ = new QButtonGroup();
	printer_choice_   = new QRadioButton(tr("Impression sur une imprimante physique",               "Print type choice"));
	pdf_choice_       = new QRadioButton(tr("Impression vers un fichier au format PDF",             "Print type choice"));

	filepath_field_   = new QLineEdit();
	browse_button_    = new QPushButton("...");
	buttons_          = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
	
	dialog_ -> setWindowTitle(tr("Choix du type d'impression"));
	printer_icon_ -> setPixmap(QET::Icons::Printer.pixmap(32, 32));
	pdf_icon_     -> setPixmap(QET::Icons::PDF.pixmap(32, 32));

	printtype_choice_ -> addButton(printer_choice_);
	printtype_choice_ -> addButton(pdf_choice_);

	printer_choice_ -> setChecked(true);
	if (!file_name_.isEmpty()) filepath_field_ -> setText(file_name_ + ".pdf");
	
	// connexions signaux / slots
	connect(printer_choice_, SIGNAL(toggled(bool)), this,    SLOT(updatePrintTypeDialog()));
	connect(pdf_choice_,     SIGNAL(toggled(bool)), this,    SLOT(updatePrintTypeDialog()));
	connect(browse_button_,  SIGNAL(clicked(bool)), this,    SLOT(browseFilePrintTypeDialog()));
	connect(buttons_,        SIGNAL(accepted()),    this,    SLOT(acceptPrintTypeDialog()));
	connect(buttons_,        SIGNAL(rejected()),    dialog_, SLOT(reject()));
	
	// organisation graphique
	glayout0_ = new QGridLayout();
	hlayout0_ = new QHBoxLayout();
	vlayout0_ = new QVBoxLayout();
	
	hlayout0_ -> addWidget(filepath_field_);
	hlayout0_ -> addWidget(browse_button_);
	glayout0_ -> addWidget(printer_icon_,   0, 0);
	glayout0_ -> addWidget(printer_choice_, 0, 1);
	glayout0_ -> addWidget(pdf_icon_,       1, 0);
	glayout0_ -> addWidget(pdf_choice_,     1, 1);
	glayout0_ -> addLayout(hlayout0_,       3, 1);
	
	vlayout0_ -> addWidget(printtype_label_);
	vlayout0_ -> addLayout(glayout0_);
	vlayout0_ -> addWidget(buttons_);
	
	dialog_ -> setLayout(vlayout0_);
	
	updatePrintTypeDialog();
}

/**
	Assure la coherence du dialogue permettant le choix du type d'impression
*/
void DiagramPrintDialog::updatePrintTypeDialog() {
	// imprime-t-on vers un fichier ?
	bool file_print = !(printer_choice_ -> isChecked());
	
	// on n'active le champ fichier que pour les impressions vers un fichier
	filepath_field_ -> setEnabled(file_print);
	browse_button_  -> setEnabled(file_print);
	
	// on corrige eventuellement l'extension du fichier deja selectionne
	if (file_print)
	{
		QString filepath = filepath_field_ -> text();
		if (!filepath.isEmpty())
		{
			if (pdf_choice_ -> isChecked() && filepath.endsWith(".ps"))
			{
				QRegExp re("\\.ps$", Qt::CaseInsensitive);
				filepath.replace(re, ".pdf");
				filepath_field_ -> setText(filepath);
			}
		}
	}
}

/**
	Verifie l'etat du dialogue permettant le choix du type d'impression lorsque
	l'utilisateur le valide.
*/
void DiagramPrintDialog::acceptPrintTypeDialog() {
	bool file_print = !(printer_choice_ -> isChecked());
	if (file_print) {
		// un fichier doit avoir ete entre
		if (filepath_field_ -> text().isEmpty()) {
			QET::QetMessageBox::information(
				parentWidget(),
				tr("Fichier manquant", "message box title"),
				tr("Vous devez indiquer le chemin du fichier PDF/PS à créer.", "message box content")
			);
		} else dialog_ -> accept();
	} else {
		// une imprimante doit avoir ete selectionnee
		/// @todo
		dialog_ -> accept();
	}
}

/**
	Permet a l'utilisateur de choisir un fichier 
*/
void DiagramPrintDialog::browseFilePrintTypeDialog() {
	QString extension;
	QString filter;
	if (printer_choice_ -> isChecked()) return;
	else if (pdf_choice_ -> isChecked())
	{
		extension = ".pdf";
		filter    = tr("Fichiers PDF (*.pdf)",       "file filter");
	}
	
	QString filepath = QFileDialog::getSaveFileName(
		parentWidget(),
		QString(),
		filepath_field_ -> text(),
		filter
	);
	
	if (!filepath.isEmpty()) {
		if (!filepath.endsWith(extension)) filepath += extension;
		filepath = QDir::toNativeSeparators(QDir::cleanPath(filepath));
		filepath_field_ -> setText(filepath);
	}
}

/**
	Effectue l'impression elle-meme
	@param diagrams Schemas a imprimer
	@param fit_page Booleen indiquant s'il faut adapter les schemas aux pages
	ou non
	@param options Options de rendu
*/
void DiagramPrintDialog::print(const QList<Diagram *> &diagrams, bool fit_page, const ExportProperties options) {
	//qDebug() << "Demande d'impression de " << diagrams.count() << "schemas.";
#if QT_VERSION >= QT_VERSION_CHECK(5, 6, 0)
    #ifdef Q_OS_WIN
        #ifdef QT_DEBUG
            qDebug() << "--";
            qDebug() << "DiagramPrintDialog::print  printer_->resolution() before " << printer_->resolution();
            qDebug() << "DiagramPrintDialog::print  screennumber " << QApplication::desktop()->screenNumber();
        #endif

        QScreen *srn = QApplication::screens().at(QApplication::desktop()->screenNumber());
        qreal dotsPerInch = (qreal)srn->logicalDotsPerInch();
        printer_->setResolution(dotsPerInch);

        #ifdef QT_DEBUG
            qDebug() << "DiagramPrintDialog::print  dotsPerInch " << dotsPerInch;
            qDebug() << "DiagramPrintDialog::print  printer_->resolution() after" << printer_->resolution();
            qDebug() << "--";
        #endif
    #endif
#endif
	// QPainter utiliser pour effectuer le rendu
	QPainter qp(printer_);
	
	// cas special : il n'y a aucun schema a imprimer
	if (!diagrams.count()) {
		qp.end();
		return;
	}
	
	// imprime les schemas
	for (int i = 0 ; i < diagrams.count() ; ++ i) {
		printDiagram(diagrams[i], fit_page, options, &qp, printer_);
		if (i != diagrams.count() - 1) {
			printer_ -> newPage();
		}
	}
}

/**
	Imprime un schema
	@param diagram Schema a imprimer
	@param fit_page True pour adapter les schemas aux pages, false sinon
	@param options Options de rendu a appliquer pour l'impression
	@param qp QPainter a utiliser (deja initialise sur printer)
	@param printer Imprimante a utiliser
*/
void DiagramPrintDialog::printDiagram(Diagram *diagram, bool fit_page, const ExportProperties &options, QPainter *qp, QPrinter *printer) {
	//qDebug() << printer -> paperSize() << printer -> paperRect() << diagram -> title();
	// l'imprimante utilise-t-elle toute la feuille ?
	bool full_page = printer -> fullPage();
	
	// impression physique (!= fichier PDF)
	if (printer -> outputFileName().isEmpty()) {
		// utiliser cette condition pour agir differemment en cas d'impression physique
	}
	
	saveReloadDiagramParameters(diagram, options, true);
	
	// deselectionne tous les elements
	QList<QGraphicsItem *> selected_elmts = diagram -> selectedItems();
	foreach (QGraphicsItem *qgi, selected_elmts) qgi -> setSelected(false);
	
	// enleve le flag focusable de tous les elements concernes pour eviter toute reprise de focus par un champ de texte editable
	QList<QGraphicsItem *> focusable_items;
	foreach (QGraphicsItem *qgi, diagram -> items()) {
		if (qgi -> flags() & QGraphicsItem::ItemIsFocusable) {
			focusable_items << qgi;
			qgi -> setFlag(QGraphicsItem::ItemIsFocusable, false);
		}
	}
	
	// evite toute autre forme d'interaction
	foreach (QGraphicsView *view, diagram -> views()) {
		view -> setInteractive(false);
	}
	
	QRect diagram_rect = diagramRect(diagram, options);
	if (fit_page) {
		// impression adaptee sur une seule page
		diagram -> render(qp, QRectF(), diagram_rect, Qt::KeepAspectRatio);
	} else {
		// impression sur une ou plusieurs pages
		QRect printed_area = full_page ? printer -> paperRect() : printer -> pageRect();
		//qDebug() << "impression sur une ou plusieurs pages";
		//qDebug() << "  schema :" << diagram_rect;
		//qDebug() << "  page   :" << printed_area;
		
		int used_width  = printed_area.width();
		int used_height = printed_area.height();
		int h_pages_count = horizontalPagesCount(diagram, options, full_page);
		int v_pages_count = verticalPagesCount(diagram, options, full_page);
		
		QVector< QVector< QRect > > pages_grid;
		// le schema est imprime sur une matrice de feuilles
		// parcourt les lignes de la matrice
		int y_offset = 0;
		for (int i = 0 ; i < v_pages_count ; ++ i) {
			pages_grid << QVector< QRect >();
			
			// parcourt les feuilles de la ligne
			int x_offset = 0;
			for (int j = 0 ; j < h_pages_count ; ++ j) {
				pages_grid.last() << QRect(
					QPoint(x_offset, y_offset),
					QSize(
						qMin(used_width,  diagram_rect.width()  - x_offset),
						qMin(used_height, diagram_rect.height() - y_offset)
					)
				);
				x_offset += used_width;
			}
			
			y_offset += used_height;
		}
		
		// ne retient que les pages a imprimer
		QVector<QRect> pages_to_print;
		for (int i = 0 ; i < v_pages_count ; ++ i) {
			for (int j = 0 ; j < h_pages_count ; ++ j) {
				pages_to_print << pages_grid.at(i).at(j);
			}
		}
		//qDebug() << "  " << pages_to_print.count() << " pages a imprimer :";
		
		// parcourt les pages pour impression
		for (int i = 0 ; i < pages_to_print.count() ; ++ i) {
			QRect current_rect(pages_to_print.at(i));
			//qDebug() << "    " << current_rect;
			diagram -> render(
				qp,
				QRect(QPoint(0,0), current_rect.size()),
				current_rect.translated(diagram_rect.topLeft()),
				Qt::KeepAspectRatio
			);
			if (i != pages_to_print.count() - 1) {
				printer -> newPage();
			}
		}
	}
	
	// remet en place les interactions
	foreach (QGraphicsView *view, diagram -> views()) {
		view -> setInteractive(true);
	}
	
	// restaure les flags focusable
	foreach (QGraphicsItem *qgi, focusable_items) {
		qgi -> setFlag(QGraphicsItem::ItemIsFocusable, true);
	}
	
	// restaure les elements selectionnes
	foreach (QGraphicsItem *qgi, selected_elmts) qgi -> setSelected(true);
	
	saveReloadDiagramParameters(diagram, options, false);
}

/**
	Sauve ou restaure les parametres du schema
	@param diagram Schema dont on sauve ou restaure les parametres
	@param options Parametres a appliquer
	@param save true pour memoriser les parametres du schema et appliquer ceux
	definis dans options, false pour restaurer les parametres
*/
void DiagramPrintDialog::saveReloadDiagramParameters(Diagram *diagram, const ExportProperties options, bool save) {
	static ExportProperties state_exportProperties;
	
	if (save) {
		// memorise les parametres relatifs au schema tout en appliquant les nouveaux
		state_exportProperties = diagram -> applyProperties(options);
	} else {
		// restaure les parametres relatifs au schema
		diagram -> applyProperties(state_exportProperties);
	}
}

/**
	Save parameters set in the "page setup" dialog into the QElectroTech
	configuration. Key/values pairs are associated to the printer for which
	they have been set.
*/
void DiagramPrintDialog::savePageSetupForCurrentPrinter()
{
	QSettings settings;
	QString printer_section = settingsSectionName(printer_);
	
	while (!settings.group().isEmpty()) settings.endGroup();
	settings.beginGroup("printers");
	settings.beginGroup(printer_section);
	
	settings.setValue("orientation", printer_ -> orientation() == QPrinter::Portrait ? "portrait" : "landscape");
	settings.setValue("papersize", int(printer_ -> paperSize()));
	if (printer_ -> paperSize() == QPrinter::Custom) {
		QSizeF size = printer_ -> paperSize(QPrinter::Millimeter);
		settings.setValue("customwidthmm", size.width());
		settings.setValue("customheightmm", size.height());
	} else {
		settings.remove("customwidthmm");
		settings.remove("customheightmm");
	}
	qreal left, top, right, bottom;
	printer_ -> getPageMargins(&left, &top, &right, &bottom, QPrinter::Millimeter);
	settings.setValue("marginleft", left);
	settings.setValue("margintop", top);
	settings.setValue("marginright", right);
	settings.setValue("marginbottom", bottom);
	settings.setValue("fullpage", printer_ -> fullPage() ? "true" : "false");
	settings.endGroup();
	settings.endGroup();
	settings.sync();
}


/**
	Load parameters previously set in the "page setup" dialog for the current
	printer, if any.
*/
void DiagramPrintDialog::loadPageSetupForCurrentPrinter()
{
	QSettings settings;
	QString printer_section = settingsSectionName(printer_);
	
	while (!settings.group().isEmpty()) settings.endGroup();
	settings.beginGroup("printers");
	if (!settings.childGroups().contains(printer_section)) {
		settings.endGroup();
		return;
	}
	
	settings.beginGroup(printer_section);
	if (settings.contains("orientation")) {
		QString value = settings.value("orientation", "landscape").toString();
		printer_ -> setOrientation(value == "landscape" ? QPrinter::Landscape : QPrinter::Portrait);
	}
	if (settings.contains("papersize")) {
		int value = settings.value("papersize", QPrinter::A4).toInt();
		if (value == QPrinter::Custom) {
			bool w_ok, h_ok;
			int w = settings.value("customwidthmm", -1).toInt(&w_ok);
			int h = settings.value("customheightmm", -1).toInt(&h_ok);
			if (w_ok && h_ok && w != -1 && h != -1) {
				printer_ -> setPaperSize(QSizeF(w, h), QPrinter::Millimeter);
			}
		} else if (value < QPrinter::Custom) {
			printer_ -> setPaperSize(static_cast<QPrinter::PaperSize>(value));
		}
	}
	
	qreal margins[4];
	printer_ -> getPageMargins(&margins[0], &margins[1], &margins[2], &margins[3], QPrinter::Millimeter);
	QStringList margins_names(QStringList() << "left" << "top" << "right" << "bottom");
	for (int i = 0 ; i < 4 ; ++ i) {
		bool conv_ok;
		qreal value = settings.value("margin" + margins_names.at(i), -1.0).toReal(&conv_ok);
		if (conv_ok && value != -1.0) margins[i] = value;
	}
	printer_ -> setPageMargins(margins[0], margins[1], margins[2], margins[3], QPrinter::Millimeter);
	printer_ -> setFullPage(settings.value("fullpage", "false").toString() == "true");
	
	settings.endGroup();
	settings.endGroup();
}

/**
	@return a section name for use with QSettings in order to store parameters
	related to \a printer.
*/
QString DiagramPrintDialog::settingsSectionName(const QPrinter *printer) {
	QPrinter::OutputFormat printer_format = printer -> outputFormat();
	if (printer_format == QPrinter::NativeFormat) {
		return(printer -> printerName().replace(" ", "_"));
	} else if (printer_format == QPrinter::PdfFormat) {
		return("QET_PDF_Printing");
	}
	return(QString());
}