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#include "helpwindow.h"

#include "mainwindow.h"

#include "tabbedbrowser.h"

#include "helpdialog.h"

#include "config.h"

#include <QApplication>

#include <QClipboard>

#include <QUrl>

#include <QMessageBox>

#include <QDir>

#include <QFile>

#include <QProcess>

#include <QAction>

#include <QFileInfo>

#include <QFont>

#include <QtEvents>

#include <QTextStream>

#include <QTextCodec>

#include <QStatusBar>

#include <QTextCursor>

#include <QTextObject>

#include <QTextLayout>

#include <QtDebug>

#include <qdesktopservices.h>

#include <QtGui/QClipboard>

#include <QtGui/QApplication>

#if defined(Q_OS_WIN32)

#  include <windows.h>

#endif

QT_BEGIN_NAMESPACE

HelpWindow::HelpWindow(MainWindow *w, QWidget *parent)

    : QTextBrowser(parent)

    , mw(w)

    , blockScroll(false)

    , shiftPressed(false)

    , newWindow(false)

{

    FontSettings settings = Config::configuration()->fontSettings();

    setFont(settings.browserFont);

    connect(this, SIGNAL(copyAvailable(bool)), w, SLOT(copyAvailable(bool)));

}

void HelpWindow::setSource(const QUrl &name)

{

    if (name.isValid()) {

        if (name.scheme() == QLatin1String("http") || name.scheme() == QLatin1String("ftp") 

            || name.scheme() == QLatin1String("mailto") || name.path().endsWith(QLatin1String("pdf"))) {

            bool launched = QDesktopServices::openUrl(name);

            if (!launched) {

                QMessageBox::information(mw, tr("Help"),

                             tr("Unable to launch web browser.\n"),

                             tr("OK"));

            }

            return;

        }

        QFileInfo fi(name.toLocalFile());

        if (name.scheme() == QLatin1String("file") && fi.exists()) {

            if (newWindow || (shiftPressed && hasFocus())) {

                shiftPressed = false;

                mw->saveSettings();

                MainWindow *nmw = new MainWindow;

                nmw->move(mw->geometry().topLeft());

                nmw->show();

                if (mw->isMaximized())

                    nmw->showMaximized();

                nmw->setup();

                nmw->showLink(name.toString());

            } else {

                QTextBrowser::setSource(name);

                QTextBrowser::scrollToAnchor(name.fragment());

            }

            return;

        }

    }

    mw->statusBar()->showMessage(tr("Failed to open link: '%1'").arg(name.toString()), 5000);

    setHtml(tr("<div align=\"center\"><h1>The page could not be found</h1><br>"

        "<h3>'%1'</h3></div>").arg(name.toString()));

    mw->browsers()->updateTitle(tr("Error..."));

}

void HelpWindow::openLinkInNewWindow()

{

    if (lastAnchor.isEmpty())

        return;

    newWindow = true;

    setSource(lastAnchor);

    newWindow = false;

}

void HelpWindow::openLinkInNewWindow(const QString &link)

{

    lastAnchor = link;

    openLinkInNewWindow();

}

void HelpWindow::openLinkInNewPage()

{

    if(lastAnchor.isEmpty())

        return;

    mw->browsers()->newTab(lastAnchor);

    lastAnchor.clear();

}

void HelpWindow::openLinkInNewPage(const QString &link)

{

    lastAnchor = link;

    openLinkInNewPage();

}

bool HelpWindow::hasAnchorAt(const QPoint& pos)

{

    lastAnchor = anchorAt(pos);

    if (lastAnchor.isEmpty()) 

        return false;

    lastAnchor = source().resolved(lastAnchor).toString();

    if (lastAnchor.at(0) == QLatin1Char('#')) {

        QString src = source().toString();

        int hsh = src.indexOf(QLatin1Char('#'));

        lastAnchor = (hsh>=0 ? src.left(hsh) : src) + lastAnchor;

    }

    return true;

}

void HelpWindow::contextMenuEvent(QContextMenuEvent *e)

{

    QMenu menu(QLatin1String(""), 0);

    QUrl link;

    QAction *copyAnchorAction = 0;

    if (hasAnchorAt(e->pos())) {

        link = anchorAt(e->pos());

        if (link.isRelative())            

            link = source().resolved(link);

        copyAnchorAction = menu.addAction(tr("Copy &Link Location"));

        copyAnchorAction->setEnabled(!link.isEmpty() && link.isValid());

        menu.addAction(tr("Open Link in New Tab"),

                       this, SLOT(openLinkInNewPage()));

        menu.addAction(tr("Open Link in New Window\tShift+LMB"),

                       this, SLOT(openLinkInNewWindow()));

    }

    mw->setupPopupMenu(&menu);

    QAction *action = menu.exec(e->globalPos());

    if (action == copyAnchorAction)

        QApplication::clipboard()->setText(link.toString());

}

void HelpWindow::mouseReleaseEvent(QMouseEvent *e)

{

    if (e->button() == Qt::XButton1) {

        QTextBrowser::backward();

        return;

    } 

    if (e->button() == Qt::XButton2) {

        QTextBrowser::forward();

        return;

    }

    if (e->button() == Qt::MidButton && hasAnchorAt(e->pos())) {

        openLinkInNewPage();

        return;

    }

    QTextBrowser::mouseReleaseEvent(e);

}

void HelpWindow::blockScrolling(bool b)

{

    blockScroll = b;

}

void HelpWindow::ensureCursorVisible()

{

    if (!blockScroll)

        QTextBrowser::ensureCursorVisible();

}

void HelpWindow::mousePressEvent(QMouseEvent *e)

{

    shiftPressed = e->modifiers() & Qt::ShiftModifier;

    if (!(shiftPressed && hasAnchorAt(e->pos())))

        QTextBrowser::mousePressEvent(e);

}

void HelpWindow::keyPressEvent(QKeyEvent *e)

{

    shiftPressed = e->modifiers() & Qt::ShiftModifier;

    QTextBrowser::keyPressEvent(e);

}

bool HelpWindow::isKDERunning() const

{

    return !qgetenv("KDE_FULL_SESSION").isEmpty();

}

QT_END_NAMESPACE