/***************************************************************************
                           plugin_katexmlcheck.cpp - checks XML files using xmllint
                           -------------------
	begin                : 2002-07-06
	copyright            : (C) 2002 by Daniel Naber
	email                : daniel.naber@t-online.de
 ***************************************************************************/

/***************************************************************************
 This program 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.

 This program 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 this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 ***************************************************************************/

/*
-fixme: show dock if "Validate XML" is selected (doesn't currently work when Kate
 was just started and the dockwidget isn't yet visible)
-fixme(?): doesn't correctly disappear when deactivated in config
*/

//TODO:
// Cleanup unneeded headers
// Find resources and translate i18n messages
// all translations were deleted in https://websvn.kde.org/?limit_changes=0&view=revision&revision=1433517
// What to do with catalogs? What is it for?
// Implement hot key shortcut to do xml validation
// Remove copyright above due to author orphaned this plugin?
// Possibility to check only well-formdness without validation
// Hide output in dock when switching to another tab
// Make ability to validate against xml schema and then edit docbook
// Should del space in [km] strang in katexmlcheck.desktop?
// Which variant should I choose? QUrl.adjusted(rm filename).path() or QUrl.toString(rm filename|rm schema)
// What about replace xmllint xmlstarlet or something?
// Maybe use QXmlReader to take dtds and xsds?

#include "plugin_katexmlcheck.h"
#include <QHBoxLayout>
//#include "plugin_katexmlcheck.moc" this goes to end

#include <qfile.h>
#include <qinputdialog.h>
#include <qregexp.h>
#include <qstring.h>
#include <qtextstream.h>
#include <kactioncollection.h>
#include <QApplication>
#include <QTreeWidget>
#include <QHeaderView>

#include <QAction>
#include <kcursor.h>
#include <klocalizedstring.h>
#include <kmessagebox.h>
#include <QTemporaryFile>
#include <kpluginfactory.h>
#include <QProcess>

#include <QComboBox>
#include <QFile>
#include <QFileDialog>
#include <QGuiApplication>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QRegExp>
#include <QStandardPaths>
#include <QString>
#include <QUrl>
#include <QVBoxLayout>

#include <ktexteditor/editor.h>
#include <ktexteditor/mainwindow.h>

#include <kxmlguifactory.h>

K_PLUGIN_FACTORY_WITH_JSON(PluginKateXMLCheckFactory,
                           "katexmlcheck.json",
                           registerPlugin<PluginKateXMLCheck>();)


PluginKateXMLCheck::PluginKateXMLCheck( QObject * const parent, const QVariantList& )
	: KTextEditor::Plugin(parent)
{
    qDebug() << "PluginXmlCheck()";
}


PluginKateXMLCheck::~PluginKateXMLCheck()
{
}


QObject *PluginKateXMLCheck::createView(KTextEditor::MainWindow *mainWindow)
{
    return new PluginKateXMLCheckView(this, mainWindow);
}


//---------------------------------
PluginKateXMLCheckView::PluginKateXMLCheckView( KTextEditor::Plugin *plugin,
                                                KTextEditor::MainWindow *mainwin)
    : QObject(mainwin)
    , KXMLGUIClient()
    , m_mainWindow(mainwin)
{
    KXMLGUIClient::setComponentName(QStringLiteral("katexmlcheck"), i18n ("Kate XML check")); // where i18n resources?
    setXMLFile(QStringLiteral("ui.rc"));

    dock = m_mainWindow->createToolView(plugin, QStringLiteral("kate_plugin_xmlcheck_ouputview"), KTextEditor::MainWindow::Bottom, QIcon::fromTheme(QStringLiteral("misc")), i18n("XML Checker Output"));
    listview = new QTreeWidget( dock );
    m_tmp_file=nullptr;
    QAction *a = actionCollection()->addAction(QStringLiteral("xml_check"));
    a->setText(i18n("Validate XML"));
    connect(a, &QAction::triggered, this, &PluginKateXMLCheckView::slotValidate);
    // TODO?:
    //(void)  new KAction ( i18n("Indent XML"), KShortcut(), this,
    //	SLOT(slotIndent()), actionCollection(), "xml_indent" );

    listview->setFocusPolicy(Qt::NoFocus);
    QStringList headers;
    headers << i18n("#");
    headers << i18n("Line");
    headers << i18n("Column");
    headers << i18n("Message");
    listview->setHeaderLabels(headers);
    listview->setRootIsDecorated(false);
    connect(listview, &QTreeWidget::itemClicked, this, &PluginKateXMLCheckView::slotClicked);

    QHeaderView *header = listview->header();
    header->setSectionResizeMode(0, QHeaderView::ResizeToContents);
    header->setSectionResizeMode(1, QHeaderView::ResizeToContents);
    header->setSectionResizeMode(2, QHeaderView::ResizeToContents);

/* TODO?: invalidate the listview when document has changed
   Kate::View *kv = application()->activeMainWindow()->activeView();
   if( ! kv ) {
   qDebug() << "Warning: no Kate::View";
   return;
   }
   connect(kv, SIGNAL(modifiedChanged()), this, SLOT(slotUpdate()));
*/

    connect(&m_proc, static_cast<void (QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished), this, &PluginKateXMLCheckView::slotProcExited);
    // we currently only want errors:
    m_proc.setProcessChannelMode(QProcess::SeparateChannels);
    // m_proc.setProcessChannelMode(QProcess::ForwardedChannels); // For Debugging. Do not use this.
    mainwin->guiFactory()->addClient(this);
}

PluginKateXMLCheckView::~PluginKateXMLCheckView()
{
    m_mainWindow->guiFactory()->removeClient( this );
    delete m_tmp_file;
    delete dock;
}

void PluginKateXMLCheckView::slotProcExited(int exitCode, QProcess::ExitStatus exitStatus)
{
    Q_UNUSED(exitCode);

    // FIXME: doesn't work correct the first time:
    //if( m_dockwidget->isDockBackPossible() ) {
    //	m_dockwidget->dockBack();
//	}

    if (exitStatus != QProcess::NormalExit) {
        QTreeWidgetItem *item = new QTreeWidgetItem();
        item->setText(0, QStringLiteral("1").rightJustified(4,' '));
        item->setText(3, QStringLiteral("Validate process crashed."));
        listview->addTopLevelItem(item);
        return;
    }

    qDebug() << "slotProcExited()";
    QApplication::restoreOverrideCursor();
    delete m_tmp_file;
    QString proc_stderr = QString::fromLocal8Bit(m_proc.readAllStandardError());
    m_tmp_file=nullptr;
    listview->clear();
    uint list_count = 0;
    uint err_count = 0;
    if( ! m_validating ) {
        // no i18n here, so we don't get an ugly English<->Non-english mixup:
        QString msg;
        if( m_dtdname.isEmpty() ) {
            msg = QStringLiteral("No DOCTYPE found, will only check well-formedness.");
        } else {
            msg = '\'' + m_dtdname + "' not found, will only check well-formedness.";
        }
        QTreeWidgetItem *item = new QTreeWidgetItem();
        item->setText(0, QStringLiteral("1").rightJustified(4,' '));
        item->setText(3, msg);
        listview->addTopLevelItem(item);
        list_count++;
    }
    if( ! proc_stderr.isEmpty() ) {
        QStringList lines = proc_stderr.split('\n', QString::SkipEmptyParts);
        QString linenumber, msg;
        int line_count = 0;
        for(QStringList::Iterator it = lines.begin(); it != lines.end(); ++it) {
            QString line = *it;
            line_count++;
            int semicolon_1 = line.indexOf(':');
            int semicolon_2 = line.indexOf(':', semicolon_1+1);
            int semicolon_3 = line.indexOf(':', semicolon_2+2);
            int caret_pos = line.indexOf('^');
            if( semicolon_1 != -1 && semicolon_2 != -1 && semicolon_3 != -1 ) {
                linenumber = line.mid(semicolon_1+1, semicolon_2-semicolon_1-1).trimmed();
                linenumber = linenumber.rightJustified(6, ' ');	// for sorting numbers
                msg = line.mid(semicolon_3+1, line.length()-semicolon_3-1).trimmed();
            } else if( caret_pos != -1 || line_count == lines.size() ) {
                // TODO: this fails if "^" occurs in the real text?!
                if( line_count == lines.size() && caret_pos == -1 ) {
                    msg = msg+'\n'+line;
                }
                QString col = QString::number(caret_pos);
                if( col == QLatin1String("-1") ) {
                    col = QLatin1String("");
                }
                err_count++;
                list_count++;
                QTreeWidgetItem *item = new QTreeWidgetItem();
                item->setText(0, QString::number(list_count).rightJustified(4,' '));
                item->setText(1, linenumber);
                item->setTextAlignment(1, (item->textAlignment(1) & ~Qt::AlignHorizontal_Mask) | Qt::AlignRight);
                item->setText(2, col);
                item->setTextAlignment(2, (item->textAlignment(2) & ~Qt::AlignHorizontal_Mask) | Qt::AlignRight);
                item->setText(3, msg);
                listview->addTopLevelItem(item);
            } else {
                msg = msg+'\n'+line;
            }
        }
    }
    if( err_count == 0 ) {
        QString msg;
        if( m_validating ) {
            msg = QStringLiteral("No errors found, document is valid.");	// no i18n here
        } else {
            msg = QStringLiteral("No errors found, document is well-formed.");	// no i18n here
        }
        QTreeWidgetItem *item = new QTreeWidgetItem();
        item->setText(0, QString::number(list_count+1).rightJustified(4,' '));
        item->setText(3, msg);
        listview->addTopLevelItem(item);
    }
}


void PluginKateXMLCheckView::slotClicked(QTreeWidgetItem *item, int column)
{
	Q_UNUSED(column);
	qDebug() << "slotClicked";
	if( item ) {
		bool ok = true;
		uint line = item->text(1).toUInt(&ok);
		bool ok2 = true;
		uint column = item->text(2).toUInt(&ok);
		if( ok && ok2 ) {
			KTextEditor::View *kv = m_mainWindow->activeView();
			if( ! kv )
				return;

			kv->setCursorPosition(KTextEditor::Cursor (line-1, column));
		}
	}
}


void PluginKateXMLCheckView::slotUpdate()
{
	qDebug() << "slotUpdate() (not implemented yet)";
}


bool PluginKateXMLCheckView::slotValidate()
{
	qDebug() << "slotValidate()";

	m_mainWindow->showToolView (dock);
	m_validating = false;
	m_dtdname = QLatin1String("");

	KTextEditor::View *kv = m_mainWindow->activeView();
	if( ! kv )
	  return false;
	delete m_tmp_file;
	m_tmp_file = new QTemporaryFile();
	if( !m_tmp_file->open() ) {
		qDebug() << "Error (slotValidate()): could not create '" << m_tmp_file->fileName() << "': " << m_tmp_file->errorString();
		KMessageBox::error(nullptr, i18n("<b>Error:</b> Could not create "
			"temporary file '%1'.", m_tmp_file->fileName()));
		delete m_tmp_file;
		m_tmp_file=nullptr;
		return false;
	}

	QTextStream s ( m_tmp_file );
	s << kv->document()->text();
	s.flush();

    QString exe = QStandardPaths::findExecutable(QStringLiteral("xmllint"));
	if( exe.isEmpty() ) {
		exe = QStandardPaths::locate(QStandardPaths::ApplicationsLocation, QStringLiteral("xmllint"));
	}
    //qDebug() << "exe=" <<exe;
// 	// use catalogs for KDE docbook:
// 	if( ! getenv("XML_CATALOG_FILES") ) {
// 		KComponentData ins("katexmlcheckplugin");
// 		QString catalogs;
// 		catalogs += ins.dirs()->findResource("data", "ksgmltools2/customization/catalog.xml");
// 		qDebug() << "catalogs: " << catalogs;
// 		setenv("XML_CATALOG_FILES", QFile::encodeName( catalogs ).data(), 1);
// 	}
	//qDebug() << "**catalogs: " << getenv("XML_CATALOG_FILES");
        QStringList args;
        args << QStringLiteral("--noout");

	// tell xmllint the working path of the document's file, if possible.
	// otherwise it will not find relative DTDs

        // I should give path to location of file, but remove filename
        // I can make QUrl.adjusted(rm filename).path()
        // or QUrl.toString(rm filename|rm schema)
        // Result is the same. Which variant should I choose?
        //QString path = kv->document()->url().adjusted(QUrl::RemoveFilename).path();
        // xmllint uses space- or colon-separated path option, so spaces should be encoded to %20. It is done with EncodeSpaces.

        // Now what about colons in file names or paths?
        // This way xmllint works normally:
        // xmllint --noout --path "/home/user/my/with:colon/" --valid "/home/user/my/with:colon/demo-1.xml"
        // but because this plugin makes temp file path to file is another and this way xmllint refuses to find dtd:
        // xmllint --noout --path "/home/user/my/with:colon/" --valid "/tmp/kate.X23725"
        // As workaround we can encode ':' with %3A
        QString path = kv->document()->url().toString(QUrl::RemoveFilename|QUrl::PreferLocalFile|QUrl::EncodeSpaces);
        path.replace(':',QLatin1String("%3A"));
        // because of such inconvenience with xmllint and paths, maybe switch to xmlstarlet?

        qDebug() << "path=" << path;

	if (!path.isEmpty()) {
                args << QStringLiteral("--path") << path;

	}

	// heuristic: assume that the doctype is in the first 10,000 bytes:
	QString text_start = kv->document()->text().left(10000);
	// remove comments before looking for doctype (as a doctype might be commented out
	// and needs to be ignored then):
	QRegExp re("<!--.*-->");
	re.setMinimal(true);
	text_start.remove(re);
	QRegExp re_doctype("<!DOCTYPE\\s+(.*)\\s+(?:PUBLIC\\s+[\"'].*[\"']\\s+[\"'](.*)[\"']|SYSTEM\\s+[\"'](.*)[\"'])", Qt::CaseInsensitive);
	re_doctype.setMinimal(true);

	if( re_doctype.indexIn(text_start) != -1 ) {
		QString dtdname;
		if( ! re_doctype.cap(2).isEmpty() ) {
			dtdname = re_doctype.cap(2);
		} else {
			dtdname = re_doctype.cap(3);
		}
		if( !dtdname.startsWith(QLatin1String("http:")) ) {		// todo: u_dtd.isLocalFile() doesn't work :-(
			// a local DTD is used
			m_validating = true;
                        args << QStringLiteral("--valid");
		} else {
			m_validating = true;
                        args << QStringLiteral("--valid");
		}
	} else if( text_start.indexOf(QLatin1String("<!DOCTYPE")) != -1 ) {
		// DTD is inside the XML file
		m_validating = true;
                args << QStringLiteral("--valid");
	}
        args << m_tmp_file->fileName();
        qDebug() << "m_tmp_file->fileName()=" << m_tmp_file->fileName();

        m_proc.start(exe,args);
        qDebug() << "m_proc.program():" << m_proc.program(); // I want to see parameters
        qDebug() << "args=" << args;
        qDebug() << "exit code:"<< m_proc.exitCode();
        if( ! m_proc.waitForStarted(-1) ) {
		KMessageBox::error(nullptr, i18n("<b>Error:</b> Failed to execute xmllint. Please make "
			"sure that xmllint is installed. It is part of libxml2."));
		return false;
	}
	QApplication::setOverrideCursor(Qt::WaitCursor);
	return true;
}

#include "plugin_katexmlcheck.moc"
