/****************************************************************************
 **
 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** 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 COPYRIGHT
 ** OWNER 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."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

#ifndef IMAGEVIEWER_H
#define IMAGEVIEWER_H

#include <QMainWindow>
#include <QPrinter>
#include <QtGui>
#include <QResizeEvent>
#include <QPushButton>
#include <QSlider>
#include <QColor>

#include <math.h>
#include "fstream"
#include <iostream>

class QAction;
class QLabel;
class QMenu;
class QScrollArea;
class QScrollBar;
class QTextEdit;
class QVBoxLayout;
class QTabWidget;
class QPushButton;
class QSpinBox;

class ImageViewer : public QMainWindow {
  Q_OBJECT

  private:
    // First task tab
    QWidget* task_tab_widget1;
    QVBoxLayout* task_tab1;

    QPushButton* draw_black_line;
    QPushButton* draw_rainbow_cross;
    QPushButton* acid_trip;
    QPushButton* diagonal_cross;
    QPushButton* monochrome;


    QSlider* line_slider;

    // Second task tab
    QWidget* task_tab_widget2;
    QVBoxLayout* task_tab2;

    QLabel* stats;
    QLabel* histogramm_label;
    QPushButton* analyze_image;
    
    QSlider* brightness_slider;
    QSlider* contrast_slider;
    
    // Third task tab
    QWidget* task_tab_widget3;
    QVBoxLayout* task_tab3;
    
    // "My" space for storing data/results
    int grayscale_absolute_histogramm[256];
    double grayscale_relative_histogramm[256];
    QImage* histogramm;
    QImage* original_image;

  private slots:
    // Custom slots
    void drawBlackLine();
    void drawRainbowCross();
    void drawDiagonalCross();
    void acidTrippin();
    void analyzeImage();
    void updateHistogramm();
    void adjustBrightness(int b);
    void adjustContrast(int c);
    void convertToMonochrome();

    void open();
    void print();
    void zoomIn();
    void zoomOut();
    void normalSize();
    void fitToWindow();
    void about();
     
  public:
    ImageViewer();
    bool loadFile(const QString &);
    void updateImageDisplay();

  protected:
    void resizeEvent(QResizeEvent * event);

  private:
    // Custom methods
    void drawRainbowCross(int h);
    int getAverageIntensity();
    int getIntensityVariance();
    
    void generateControlPanels();
    void startLogging();
    void generateMainGui();
    void createActions();
    void createMenus();
    void updateActions();
    void scaleImage(double factor);
    void adjustScrollBar(QScrollBar *scrollBar, double factor);

    void initializeImage();
    void renewLogging();

    QTabWidget* tabWidget;
    QTextEdit* logBrowser;
    QWidget* centralwidget;
    QLabel* imageLabel;
    QScrollArea* scrollArea;
    double scaleFactor;
    QImage* image;

    std::fstream logFile;

#ifndef QT_NO_PRINTER
    QPrinter printer;
#endif

    QAction *openAct;
    QAction *printAct;
    QAction *exitAct;
    QAction *zoomInAct;
    QAction *zoomOutAct;
    QAction *normalSizeAct;
    QAction *fitToWindowAct;
    QAction *aboutAct;
    QAction *aboutQtAct;

    QMenu *fileMenu;
    QMenu *viewMenu;
    QMenu *helpMenu;
};
#endif