/**
  * @RDE_HEADER@
  * offers zoom-buttons, current zoom in percent and date-time indicators coresponding to the viewport
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by Mike Wille, SLSE, 2014-10-01
  */

#pragma once

#include "EventTools.h"
#include "LineMap.h"
#include <QWidget>
#include <QPoint>
#include <QPair>


namespace NGL
{
class INGLLogger;
//class Settings;
}
class QPushButton;
class QLabel;
class QComboBox;


namespace LtsTimelineClassic
{

/**
 * @brief offers zoom-buttons, current zoom in percent and date-time indicators coresponding to the viewport
 */
class TimelineIndicator : public QWidget
{
  Q_OBJECT

  //static const int s_MinimalZoomPoints = 1; // no need to zoom out of 100% (logically)
  static const int s_TimeTextDistanceTolerancePixels =  10;
  static const int s_pbSize = 18;

public:
  explicit TimelineIndicator(QWidget *parent);
  ~TimelineIndicator();
  qint64 zoomFactorPoints() const { return m_zoomFactorPoints * 1000; }

  /**
   * @brief refreshes the indicator data, which triggers all views to refresh also
   */
  void refreshData();

private:
  QVector<qint64> m_timeArray;
  qint64 m_zoomFactorPoints;
  QPushButton *m_pbZoom;
  QPushButton *m_pbUnzoom;
  QComboBox *m_cbZoomLevel;
  int m_currentTextHeight; // text height of last drawn text
  int m_currentTextWidth;
  LineMap m_lineMap;
  int m_sectionPos;
  int m_sectionSize;
  NGL::INGLLogger &m_logger;

protected:
  /**
   * @brief draws all date texts on itself
   */
  void paintEvent(QPaintEvent *);

signals:
  /**
   * @brief gives connected classes new max & min values
   * @param min new first event in timeline in seconds since epoch
   * @param max new last event in timeline in seconds since epoch
   */
  void signalSetTimelineRange(qint64 min, qint64 max);

  /**
   * @brief gives connected classes new zoom factor value (seconds)
   * @param zoomFactor new zoom factor
   */
  void signalSetZoomFactor(qint64 zoomFactor);

  /**
   * @brief gives connected classes the command to delete their line list (date text line lists)
   */
  void signalResetLineList();

  /**
   * @brief gives connected classes date text line pixel position which should be added to a list,
   * so that the view can draw them on itself
   * @param posX pixel position of date text line
   */
  void signalAddLine(int posX, qint64 time);

  void signalZoomChanged();


private slots:
  void afterZoom();


public slots:

  /**
   * @brief sets new values to this class
   * @param index affected column
   * @param oldSize old width of column
   * @param newSize new width of column
   */
  void slotSectionResized(int logicalIndex, int oldSize, int newSize);

  /**
   * @brief is called when push button "zoom" (+) is pressed
   */
  void slotZoom();

  /**
   * @brief is called when push button "zoom" (+) is pressed
   */
  void slotUnzoom();

  /**
   * @brief deletes line list (date text line lists)
   */
  void slotResetLineList();

  /**
   * @brief add date text line pixel position which should be added to a list,
   * so that the view can draw them on itself
   * @param posX pixel position of date text line
   */
  void slotAddLine(double posX, qint64 time);

};

}