/*=========================================================================

   Program: ParaView
   Module:    pqCoreUtilities.h

   Copyright (c) 2005,2006 Sandia Corporation, Kitware Inc.
   All rights reserved.

   ParaView is a free software; you can redistribute it and/or modify it
   under the terms of the ParaView license version 1.2.

   See License_v1.2.txt for the full ParaView license.
   A copy of this license can be obtained by contacting
   Kitware Inc.
   28 Corporate Drive
   Clifton Park, NY 12065
   USA

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

========================================================================*/
#ifndef pqCoreUtilities_h
#define pqCoreUtilities_h

#include "pqCoreModule.h"
#include "pqEventDispatcher.h"

#include <QDir>
#include <QEventLoop>
#include <QFile>
#include <QFileInfo>
#include <QMessageBox>
#include <QPointer>
#include <QString>
#include <QStringList>
#include <QWidget>

class QPalette;
class vtkObject;

/**
 * INTERNAL CLASS (DO NOT USE). This is used by
 * pqCoreUtilities::connectWithVTK() methods.
 */
class PQCORE_EXPORT pqCoreUtilitiesEventHelper : public QObject
{
  Q_OBJECT;
  typedef QObject Superclass;

public:
  pqCoreUtilitiesEventHelper(QObject* parent);
  ~pqCoreUtilitiesEventHelper() override;

Q_SIGNALS:
  void eventInvoked(vtkObject*, unsigned long, void*);

private:
  Q_DISABLE_COPY(pqCoreUtilitiesEventHelper)

  void executeEvent(vtkObject*, unsigned long, void*);
  class pqInternal;
  pqInternal* Interal;
  friend class pqCoreUtilities;
};

/**
 * pqCoreUtilities is a collection of arbitrary utility functions that can be
 * used by the application.
 */
class PQCORE_EXPORT pqCoreUtilities : public QObject
{
  Q_OBJECT
public:
  /**
   * When popping up dialogs, it's generally better if we set the parent
   * widget for those dialogs to be the QMainWindow so that the dialogs show up
   * centered correctly in the application. For that purpose this convenience
   * method is provided. It locates a QMainWindow and returns it.
   */
  static void setMainWidget(QWidget* widget) { pqCoreUtilities::MainWidget = widget; }
  static QWidget* mainWidget()
  {
    if (!pqCoreUtilities::MainWidget)
    {
      pqCoreUtilities::MainWidget = pqCoreUtilities::findMainWindow();
    }
    return pqCoreUtilities::MainWidget;
  }

  /**
   * Call QApplication::processEvents plus make sure the testing framework is
   */
  static void processEvents(QEventLoop::ProcessEventsFlags flags = QEventLoop::AllEvents)
  {
    pqEventDispatcher::processEvents(flags);
  }

  /**
   * Return the path of the root ParaView user specific configuration directory
   */
  static QString getParaViewUserDirectory();

  /**
   * Return the path of the launched application
   */
  static QString getParaViewApplicationDirectory();

  /**
   * Return the list of full available path that exists inside the shared
   * application path and the user specific one
   */
  static QStringList findParaviewPaths(
    QString directoryOrFileName, bool lookupInAppDir, bool lookupInUserDir);
  static QString getNoneExistingFileName(QString expectedFilePath);

  /**
   * Method used to connect VTK events to Qt slots (or signals).
   * This is an alternative to using vtkEventQtSlotConnect. This method gives a
   * cleaner API to connect vtk-events to Qt slots. It manages cleanup
   * correctly i.e. either vtk-object or the qt-object can be deleted and the
   * observers will be cleaned up correctly. One can disconnect the connection
   * made explicitly by vtk_object->RemoveObserver(eventId) where eventId is
   * the returned value.
   */
  static unsigned long connect(vtkObject* vtk_object, int vtk_event_id, QObject* qobject,
    const char* signal_or_slot, Qt::ConnectionType type = Qt::AutoConnection);

  /**
   * This provides a mechanism to prompt the user to make a choice or
   * to show them some information. The user can decide to make their choice
   * persistent. Two configurations are supported:
   * 1. The method prompts the user with a "Yes", "No", and "Yes,
   * and don't ask again" message box. Returns true for "Yes" and false for "No".
   * If "Yes, and don't ask again" was clicked, the selection is remembered in
   * pqSettings and next time this method is called with the same settingsKey
   * it will simply return true.
   * 2. The method shows a message box with a "Ok" and "Ok and don't show again"
   * If "Ok, and don't show again" was clicked, the next time this method is
   * called with the same settingsKey it will simply return.
   * The 'don't ask/show again' button is created by or-ing 'buttons' with
   * QMessageBox::Save.
   * NOTE: due to issues with test recording and playback, currently, this
   * dialog is not prompted (instead always returning true) when
   * DASHBOARD_TEST_FROM_CTEST environment variable is set. This may change in future.
   */
  static bool promptUser(const QString& settingsKey, QMessageBox::Icon icon, const QString& title,
    const QString& message, QMessageBox::StandardButtons buttons, QWidget* parentWdg = nullptr);

  /**
   * This show a QMessageBox to the user and returns the clicked button.
   * NOTE: due to issues with test recording and playback, currently, this
   * dialog is not prompted (instead always returning true) when
   * DASHBOARD_TEST_FROM_CTEST environment variable is set. This may change in future.
   */
  static QMessageBox::Button promptUserGeneric(const QString& title, const QString& message,
    QMessageBox::Icon icon, QMessageBox::StandardButtons buttons, QWidget* parentWidget);

  /**
   * Converts a double value to a full precision QString.
   * Internally uses `vtkNumberToString` for lossless conversion from double to
   * string.
   */
  static QString number(double value);

  /**
   * Convert a double KiB value to an easily readable QString
   * For example, if this function is called with 1500.0 as an input and the default precision,
   * the QString "1.46 MiB" will be returned.
   */
  static QString formatMemoryFromKiBValue(double memoryInKB, int precision = 2);

  /**
   * Setups up appearance for buttons such as Apply button
   * that we want to draw user's attention to when enabled. Currently, this
   * changes the palette to use a green background when enabled.
   */
  static void initializeClickMeButton(QAbstractButton* button);

  /**
   * Set the Hightlight value of the palette to CDash green
   * Also set HightlightedText to black
   */
  static void setPaletteHighlightToOk(QPalette& palette);

  /**
   * Set the Hightlight value of the palette to CDash yellow
   * Also set HightlightedText to white
   */
  static void setPaletteHighlightToWarning(QPalette& palette);

  /**
   * Set the Hightlight value of the palette to CDash red
   * Also set HightlightedText to white
   */
  static void setPaletteHighlightToCritical(QPalette& palette);

  /**
   * Safely delete a directory recursively. This function indicates any errors with a modal popup
   * dialog.
   */
  static void removeRecursively(QDir dir);

  /**
   * Safely delete a file. This function indicates any errors
   * with a modal popup dialog.
   */
  static void remove(const QString& filePath);

private:
  static QWidget* findMainWindow();
  static QPointer<QWidget> MainWidget;
};

#endif
