/**
  * @RDE_HEADER@
  * Online Help Viewer Dialog
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by Astrid Müller, SGAS, 2018-04-10
  */

#include "online_help_viewer_dialog.h"
#include "ui_online_help_viewer_dialog.h"

#include <ngltranslator/ngltranslator.h>
#include <ngltools/ngltools_filesystem.h>

#include <QWebEngineView>
#include <QWebEngineHistory>
#include <QMenu>


namespace OnlineHelp
{
OnlineHelpViewerDialog::OnlineHelpViewerDialog(bool isMain)
  : LtsWidgets::LtsDialog(nullptr,
                          isMain ? LtsWidgets::ButtonCombination::SeamlessDialog : LtsWidgets::ButtonCombination::CloseOnly,
                          !isMain /* closable if NOT main */)
  , m_ui(new Ui::OnlineHelpViewerDialog)
  , m_logger(getLogger("onlineHelp"))
{
  m_ui->setupUi(this);
}

bool OnlineHelpViewerDialog::init(const QString &fileName)
{
  QString locale;

  if (NGL::translationLocale() == "de_DE") // grrr..
    locale = QStringLiteral("de_DE");
  else
    locale = QStringLiteral("en_GB");

  QString helpDir = NGL::directory(NGL::FileType::ConfigFile, QStringLiteral("help"));
  if (fileName.isEmpty())
    helpDir += (locale + QStringLiteral("/index.html"));
  else // filename given
    helpDir += (locale + QStringLiteral("/%1.html").arg(fileName));

  INFO_LOG(m_logger) << "helpDir=" << helpDir;

#ifndef LTS_DEBUG
  m_ui->lblPage->setVisible(false);
#endif

  connect(m_ui->wevOnlineHelpViewer, &QWebEngineView::loadFinished, this, [=](bool ok)
  {
    Q_UNUSED(ok);
    QString url = m_ui->wevOnlineHelpViewer->page()->url().toString();
    m_ui->lblPage->setText(url);
  });

  m_ui->wevOnlineHelpViewer->load(QUrl(QUrl::fromLocalFile(helpDir)));

  m_ui->wevOnlineHelpViewer->setContextMenuPolicy(Qt::CustomContextMenu);
  connect(m_ui->wevOnlineHelpViewer, &QWebEngineView::customContextMenuRequested,
          this, &OnlineHelpViewerDialog::onContextMenuRequested);

  return true;
}

OnlineHelpViewerDialog::~OnlineHelpViewerDialog()
{
  m_ui->wevOnlineHelpViewer->setParent(nullptr);
  m_ui->wevOnlineHelpViewer->hide();
  m_ui->wevOnlineHelpViewer->deleteLater();
  delete m_ui;
}

void OnlineHelpViewerDialog::retranslate()
{
  translate(m_ui, tr("Online Help Viewer"));
}

void OnlineHelpViewerDialog::onContextMenuRequested(const QPoint &position)
{
  QMenu menu(m_ui->wevOnlineHelpViewer);
  QAction *action = menu.addAction(tr("Next Page"), this, &OnlineHelpViewerDialog::onContextdMenuForwardRequested);
  action->setEnabled(m_ui->wevOnlineHelpViewer->page()->history()->canGoForward());

  action = menu.addAction(tr("Last Page"), this, &OnlineHelpViewerDialog::onContextdMenuBackRequested);

  bool setEnable = (m_ui->wevOnlineHelpViewer->page()->history()->canGoBack()) &&
                   (m_ui->wevOnlineHelpViewer->page()->history()->backItems(2).size() > 1);  // *)
  // *) Die erste HistorySeite ist nach dem Aufschalten des Widgets immer leer.
  //    Hiermit wird verhindert dass man in diese erste leere Seite zurueckgehen kann.

  action->setEnabled(setEnable);

  menu.addAction(tr("Reload Page"),  this, &OnlineHelpViewerDialog::onContextdMenuReloadRequested);
  menu.exec(m_ui->wevOnlineHelpViewer->mapToGlobal(position));
}

void OnlineHelpViewerDialog::onContextdMenuForwardRequested()
{
  m_ui->wevOnlineHelpViewer->page()->triggerAction(QWebEnginePage::Forward);
}

void OnlineHelpViewerDialog::onContextdMenuBackRequested()
{
  m_ui->wevOnlineHelpViewer->page()->triggerAction(QWebEnginePage::Back);
}

void OnlineHelpViewerDialog::onContextdMenuReloadRequested()
{
  m_ui->wevOnlineHelpViewer->page()->triggerAction(QWebEnginePage::Reload);
}

} // namespace OnlineHelp