/**********************************************************************
** Copyright (C) 2000-2002 Trolltech AS.  All rights reserved.
**
** This file is part of the Qt Assistant.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/

#include "helpwindow.h"
#include "mainwindow.h"

#include <qurl.h>
#include <qmessagebox.h>
#include <qdragobject.h>
#include <qdir.h>
#include <qfile.h>
#include <qsettings.h>
#include <qprocess.h>
#include <qpopupmenu.h>
#include <qaction.h>
#include <qfileinfo.h>

#if defined(Q_OS_WIN32)
#include <windows.h>
#endif

HelpWindow::HelpWindow( MainWindow *w, QWidget *parent, const char *name )
    : QTextBrowser( parent, name ), mw( w ), shiftPressed( FALSE ), blockScroll( FALSE )
{

}

void HelpWindow::setSource( const QString &name )
{
    if ( name.isEmpty() )
	return;

    if ( shiftPressed ) {
	removeSelection();
	mw->saveSettings();
	mw->saveToolbarSettings();
	MainWindow *nmw = new MainWindow;
	nmw->showLink( name );
	nmw->move( mw->geometry().topLeft() );
	if ( mw->isMaximized() )
	    nmw->showMaximized();
	else
	    nmw->show();
	return;
    }
    QFileInfo fi( name );

    if ( name.left( 7 ) == "http://" || name.left( 6 ) == "ftp://" ) {
	QSettings settings;
	settings.insertSearchPath( QSettings::Windows, "/Trolltech" );
	QString webbrowser = settings.readEntry( "/Qt Assistant/3.1/Webbrowser" );
	if ( webbrowser.isEmpty() ) {
#if defined(Q_OS_WIN32)
	    QT_WA( {
		ShellExecute( winId(), 0, (TCHAR*)name.ucs2(), 0, 0, SW_SHOWNORMAL );
	    } , {
		ShellExecuteA( winId(), 0, name.local8Bit(), 0, 0, SW_SHOWNORMAL );
	    } );
#else
	    int result = QMessageBox::information( mw, tr( "Help" ), tr( "Currently no Web browser is selected.\nPlease use the settings dialog to specify one!\n" ), "Open", "Cancel" );
	    if ( result == 0 ) {
		emit chooseWebBrowser();
		QSettings freshSettings;
		webbrowser = freshSettings.readEntry( "/Qt Assistant/3.1/Webbrowser" );
	    }
#endif
	    if ( webbrowser.isEmpty() )
		return;
	}
	QProcess *proc = new QProcess();
	proc->addArgument( webbrowser );
	proc->addArgument( name );
	proc->launch( "" );
	return;
    }

    if ( name.left( 2 ) != "p:" ) {
	QUrl u( context(), name );
	if ( !u.isLocalFile() ) {
	    QMessageBox::information( mw, tr( "Help" ), tr( "Can't load and display non-local file\n"
							      "%1" ).arg( name ) );
	    return;
	}

	QTextBrowser::setSource( name );
    } else {
#if 1
	QUrl u( context(), name.mid( 2 ) );
	if ( !u.isLocalFile() ) {
	    QMessageBox::information( mw, tr( "Help" ), tr( "Can't load and display non-local file\n"
							      "%1" ).arg( name.mid( 2 ) ) );
	    return;
	}

	QTextBrowser::setSource( name.mid( 2 ) );
#else
	QString txt;
	const QMimeSource* m = mimeSourceFactory()->data( name.mid( 2 ).left( name.mid( 2 ).find( '#' ) ), context() );
	if ( !m || !QTextDrag::decode( m, txt ) ) {
	    qWarning("QTextBrowser: cannot decode %s", name.mid( 2 ).latin1() );
	    return;
	}

	int i = txt.find( "name=\"" + name.mid( name.find( '#' ) + 1 ) );
	i = txt.findRev( "<h3 class", i );
	QString s( "<a name=\"" + name.mid( name.find( '#' ) + 1 ) + "\"><p><table><tr><td bgcolor=gray>" );
	txt.insert( i, s );
	int j = txt.find( "<h3 class", i + 1 + s.length() );
	if ( j == -1 ) {
	    j = txt.find( "<!-- eo", i + 1 + s.length() );
	} else {
	    int k = txt.find( "<hr>", i + 1 + s.length() );
	    j = QMIN( j, k );
	}
	txt.insert( j, "</td></tr></table>" );
	QTextBrowser::setText( txt, context() );
	QUrl u( name.mid( 2 ) );
	if ( !u.ref().isEmpty() )
	    scrollToAnchor( u.ref() );
#endif
    }
    int i = name.find( '#' );
    QString sect;
    if ( i != -1 )
	sect = ": " + name.right( name.length() - i - 1 );
    mw->setCaption( tr( "Qt Assistant by Trolltech - %1%2" ).arg( documentTitle() ).arg( sect ) );
}


void HelpWindow::openLinkInNewWindow()
{
    if ( lastAnchor.isEmpty() )
	return;
    bool oldShiftPressed = shiftPressed;
    shiftPressed = TRUE;
    setSource( lastAnchor );
    shiftPressed = oldShiftPressed;

}


QPopupMenu *HelpWindow::createPopupMenu( const QPoint& pos )
{
    QPopupMenu *m = new QPopupMenu( this );
    lastAnchor = anchorAt( pos );
    if ( !lastAnchor.isEmpty() ) {
	QFileInfo fi( source() );
	if ( !fi.dirPath( TRUE ).isEmpty() )
	    lastAnchor = QFileInfo( fi.dirPath( TRUE ) + "/" + lastAnchor ).absFilePath();
	m->insertItem( tr("Open Link in New Window\tShift+LMB"), this, SLOT( openLinkInNewWindow() ) );
    }
    mw->actionNewWindow->addTo( m );
    m->insertSeparator();
    mw->actionGoPrevious->addTo( m );
    mw->actionGoNext->addTo( m );
    mw->actionGoHome->addTo( m );
    m->insertSeparator();
    mw->actionZoomIn->addTo( m );
    mw->actionZoomOut->addTo( m );
    m->insertSeparator();
    mw->actionEditCopy->addTo( m );
    mw->actionEditFind->addTo( m );
    return m;
}

void HelpWindow::keyPressEvent( QKeyEvent *e )
{
    shiftPressed = e->key() == Key_Shift;
    QTextBrowser::keyPressEvent( e );
}

void HelpWindow::keyReleaseEvent( QKeyEvent *e )
{
    shiftPressed = FALSE;
    QTextBrowser::keyReleaseEvent( e );
}

void HelpWindow::blockScrolling( bool b )
{
    blockScroll = b;
}

void HelpWindow::ensureCursorVisible()
{
    if ( !blockScroll )
	QTextBrowser::ensureCursorVisible();
}
