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#ifndef IMAGEVIEWER_H
#define IMAGEVIEWER_H

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

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

#include "lazy_image.cpp"

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* diagonal_cross;
    QPushButton* monochrome;
    QPushButton* reset_working_copy;
    QPushButton* save_to_original;
    
    QSlider* line_slider;

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

    QLabel* original_stats;
    QLabel* stats;
    QLabel* original_histogramm_label;
    QLabel* histogramm_label;
    QPushButton* analyze_image;
    
    QSlider* brightness_slider;
    QSlider* contrast_slider;
    
    QSlider* contrast_percentile_slider;
    
    // Third task tab
    QWidget* task_tab_widget3;
    QVBoxLayout* task_tab3;
    
    QLabel* original_histogramm_cumulative_label;
    QLabel* histogramm_cumulative_label;
    
    QPushButton* linear_histogramm_adaption;
    
    // "My" space for storing data/results
    LazyImage* original;
    LazyImage* working_copy;

  private slots:
    // Custom slots
    void drawBlackLine();
    void drawRainbowCross();
    void drawDiagonalCross();
    void analyzeImage();
    void adjustBrightness(int b);
    void adjustContrast(int c);
    void convertToMonochrome();
    void resetWorkingCopy();
    void saveToOriginal();
    void robustAutomaticContrastAdaption(int c_param);
    void linearHistogrammAdaption();

    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
    int calcIntensity(int r, int g, int b);
    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;

    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