#include "templateeditor.h"
#include <QtXml>
#include "qetproject.h"
#include "qetapp.h"

/**
	Constructor
	@param parent parent QWidget for this editor
	@param f Windows flags for this editor
	@see QWidget()
*/
TemplateEditor::TemplateEditor(QWidget *parent, Qt::WindowFlags f) :
	QWidget(parent, f),
	parent_project_(0)
{
	build();
}

/**
	Destructor
*/
TemplateEditor::~TemplateEditor() {
}

/**
	Edit the given template.
	@param project Parent project of the template to edit.
	@param template_name Name of the template to edit within its parent project.
*/
bool TemplateEditor::edit(QETProject *project, const QString &template_name) {
	// we require a project we will rattach templates to
	if (!project) return(false);
	parent_project_ = project;
	updateProjectLabel();
	
	// the template name may be empty to create a new element
	if (template_name.isEmpty()) {
		template_name_edit_ -> setText(tr("Nouveau-modele"));
		template_name_edit_ -> setReadOnly(false);
		return(true);
	}
	
	QDomElement xml_tb_template = project -> getTemplateXmlDescriptionByName(template_name);
	if (!xml_tb_template.isNull()) {
		QDomDocument xml_doc;
		xml_doc.appendChild(xml_doc.importNode(xml_tb_template, true));
		template_name_edit_ -> setText(template_name);
		template_name_edit_ -> setReadOnly(true);
		
		QString xml_str = xml_doc.toString(4);
		xml_str.replace(QRegExp("^<titleblocktemplate[^>]*>"), "");
		xml_str.replace(QRegExp("</titleblocktemplate>"), "");
		template_xml_edit_ -> setPlainText("    " + xml_str.trimmed());
		
		// stores the parent project and template name, in order to write/save the template later
		template_name_ = template_name;
		return(true);
	}
	return(false);
}

/**
	Validates the content of the current text area. It has to be a valid XML
	description of a title block template for this method not to display a
	message to the user.
	@todo implement it.
*/
void TemplateEditor::validate() {
	QMessageBox::information(
		this,
		tr("Not implemented yet"),
		tr("Sorry, Not implemented yet")
	);
}

/**
	Saves the content of the current text area to a template within the project.
*/
void TemplateEditor::save() {
	if (!parent_project_) return;
	
	// are we creating a new template?
	if (!template_name_edit_ -> isReadOnly()) {
		// Yes, so we must ensure the new name will not clatch with an existing ine
		if (parent_project_ -> embeddedTitleBlockTemplates().contains(template_name_edit_ -> text())) {
			QMessageBox::critical(
				this,
				tr("Un mod\350le de ce nom existe d\351j\340"),
				tr("Un mod\350le de ce nom existe d\351j\340 au sein du projet - veuillez choisir un autre nom.")
			);
			/// TODO propose to overwrite the existing template?
			return;
		}
		
	}
	
	QDomDocument xml_doc;
	bool parsing = xml_doc.setContent(getXmlString());
	if (!parsing) {
		QMessageBox::critical(
			this,
			tr("Code XML non valide"),
			tr("Le code XML du mod\350le ne semble pas \352tre valide. Impossible d'enregistrer le mod\350le.")
		);
		return;
	}
	
	if (!template_name_edit_ -> isReadOnly()) {
		template_name_edit_ -> setReadOnly(true);
		template_name_ = template_name_edit_ -> text();
	}
	parent_project_ -> setTemplateXmlDescription(template_name_, xml_doc.documentElement());
}

/**
	Exits this editor.
*/
void TemplateEditor::quit() {
	/// TODO save if needed
	close();
}

/**
	Allows the user to easily integrate a logo in to the currently edited title block
	template.
*/
void TemplateEditor::integrateLogo() {
	// we need a filepath
	QString filepath = QFileDialog::getOpenFileName(
		this,
		tr("S\351lectionnez un fichier image"),
		QString(),
		tr("Images vectorielles (*.svg);;Images bitmap (*.png *.jpg *.jpeg *.gif *.bmp *.xpm);;Tous les fichiers (*)")
	);
	if (filepath.isNull()) return;
	
	// that filepath needs to point to a valid, readable file
	QFileInfo filepath_info(filepath);
	if (!filepath_info.exists() || !filepath_info.isReadable()) {
		QMessageBox::critical(this, tr("Erreur"), tr("Impossible d'ouvrir le fichier sp\351cifi\351"));
		return;
	}
	QString filename = filepath_info.fileName();
	
	/// TODO identify whether the given file is a bitmap or vector graphics and integrate it accordingly
	// now, we need the XML document of the currently edited template
	QDomDocument xml_template;
	if (!xml_template.setContent(getXmlString())) {
		QMessageBox::critical(this, tr("Erreur"), tr("Le code XML du mod\350le ne semble pas \352tre valide."));
		return;
	}
	
	// we need a <logos> section
	QDomElement logos_section = xml_template.documentElement().firstChildElement("logos");
	QDomElement logo_xml_elmt;
	if (logos_section.isNull()) {
		logos_section = xml_template.createElement("logos");
		xml_template.documentElement().appendChild(logos_section);
	} else {
		// is there a logo of the same name already?
		QString tag = "logo";
		for (QDomElement e = logos_section.firstChildElement(tag) ; !e.isNull() ; e = e.nextSiblingElement(tag)) {
			if (e.attribute("name") == filename) {
				logo_xml_elmt = e;
				break;
			}
		}
	}
	
	// we read the provided logo
	QFile logo_file(filepath);
	logo_file.open(QIODevice::ReadOnly);
	QString base64_string = QString(logo_file.readAll().toBase64());
	
	// we insert it into our XML document
	QDomText t = xml_template.createTextNode(base64_string);
	
	if (!logo_xml_elmt.isNull()) {
		logo_xml_elmt.setAttribute("storage", "base64");
		QDomNodeList children = logo_xml_elmt.childNodes();
		for (int i = 0 ; i < children .count() ; ++ i) logo_xml_elmt.removeChild(children.at(i));
		logo_xml_elmt.appendChild(t);
	} else {
		QDomElement new_logo = xml_template.createElement("logo");
		new_logo.appendChild(t);
		new_logo.setAttribute("storage", "base64");
		new_logo.setAttribute("type", filepath_info.suffix());
		new_logo.setAttribute("name", filename);
		logos_section.appendChild(new_logo);
	}
	
	// we put back the XML description in the text area
	setXmlString(xml_template);
}

/**
	Builds the user interface.
*/
void TemplateEditor::build() {
	parent_project_label_ = new QLabel();
	updateProjectLabel();
	static_xml_1_ = new QLabel("<titleblocktemplate name=\"");
	static_xml_2_ = new QLabel("\">");
	static_xml_3_ = new QLabel("</titleblocktemplate>");
	template_name_edit_ = new QLineEdit();
	template_xml_edit_ = new QTextEdit();
	template_xml_edit_ -> setAcceptRichText(false);
	template_xml_edit_ -> setFontFamily("monospace");
	template_xml_edit_ -> setWordWrapMode(QTextOption::NoWrap);
	
	integrate_logo_ = new QPushButton(tr("Int\351grer un logo"));
	validate_button_ = new QPushButton(tr("V\351rifier le mod\350le"));
	save_button_ = new QPushButton(tr("Enregistrer et appliquer"));
	quit_button_ = new QPushButton(tr("Quitter"));
	
	connect(integrate_logo_,  SIGNAL(released()), this, SLOT(integrateLogo()));
	connect(validate_button_, SIGNAL(released()), this, SLOT(validate()));
	connect(save_button_,     SIGNAL(released()), this, SLOT(save()));
	connect(quit_button_,     SIGNAL(released()), this, SLOT(quit()));
	
	QHBoxLayout *h_layout0 = new QHBoxLayout();
	h_layout0 -> addWidget(integrate_logo_);
	h_layout0 -> addWidget(validate_button_);
	h_layout0 -> addWidget(save_button_);
	h_layout0 -> addWidget(quit_button_);
	
	QHBoxLayout *h_layout1 = new QHBoxLayout();
	h_layout1 -> addWidget(static_xml_1_);
	h_layout1 -> addWidget(template_name_edit_);
	h_layout1 -> addWidget(static_xml_2_);
	
	QVBoxLayout *v_layout0 = new QVBoxLayout();
	v_layout0 -> addWidget(parent_project_label_);
	v_layout0 -> addLayout(h_layout1);
	v_layout0 -> addWidget(template_xml_edit_);
	v_layout0 -> addWidget(static_xml_3_);
	v_layout0 -> addLayout(h_layout0);
	
	setLayout(v_layout0);
	
	setWindowTitle(tr("QElectroTech - \311diteur de mod\350le de cartouche"));
	resize(700, 500);
}

/**
	Updates the "Parent project:" label.
*/
void TemplateEditor::updateProjectLabel() {
	QString parent_project_title;
	if (parent_project_) {
		parent_project_title = parent_project_ -> pathNameTitle();
	} else {
		parent_project_title = tr("Non d\351fini");
	}
	
	parent_project_label_ -> setText(
		QString(tr("Projet parent : %1")).arg(parent_project_title)
	);
}

/**
	@return the XML description provided by the user, as a string.
*/
QString TemplateEditor::getXmlString() const {
	QString xml_str = QString("<titleblocktemplate name=\"%1\">%2</titleblocktemplate>");
	xml_str = xml_str.arg(Qt::escape(template_name_edit_ -> text())).arg(template_xml_edit_ -> toPlainText());
	return(xml_str);
}

/**
	Displays the given title block template XML code
	@param xml_doc The XML description of a title block template
*/
void TemplateEditor::setXmlString(const QDomDocument &xml_doc) {
	QString xml_str = xml_doc.toString(4);
	xml_str.replace(QRegExp("^<titleblocktemplate[^>]*>"), "");
	xml_str.replace(QRegExp("</titleblocktemplate>"), "");
	template_xml_edit_ -> setPlainText("    " + xml_str.trimmed());
}