/**
  * @RDE_HEADER@
  * Topic Designer for the Script Editor - Set Geometry & Z-Index, delete Topics, etc.
  * $Id$
  * $HeadURL$
  * $Author$
  *
  * Created by Mike Wille, SLSE, 2017-06-09
  */

#pragma once

#include <Plugins/PresentationManagement/Gui/Script/Common/preguiscriptcommon_export.h>
#include <TopicEditorBase/topic_editor_utils.h>

#include <QWidget>
#include <QVector>
#include <QLinkedList>
#include <QPointer>
#include <QScrollArea>


namespace PresentationManagement
{

class PREGUISCRIPTCOMMON_EXPORT TopicDesigner: public QWidget
{
  Q_OBJECT

public:
  enum class HandleType
  {
    None, Whole,
    TopLeft, TopCenter, TopRight,
    CenterLeft, CenterRight,
    BottomLeft, BottomCenter, BottomRight
  };

  explicit TopicDesigner(QWidget *parent = nullptr, QWidget* previewWidget = nullptr);
  ~TopicDesigner();

  void loadTopicList(const QVector<TopicEditorBase::TopicData> &topicsList); // also clears
  QVector<TopicEditorBase::TopicData> exportTopicList() const;
  void selectTopic(int topicId);
  TopicEditorBase::TopicData &selectedTopicData() noexcept(false);
  void setTopicData(const TopicEditorBase::TopicData &data);

private:
  enum class Affection { x, y, w, h, Whole, };

  void paintEvent(QPaintEvent *event) override;
  void mouseMoveEvent(QMouseEvent *event) override;
  void mousePressEvent(QMouseEvent *event) override;
  void mouseReleaseEvent(QMouseEvent *event) override;
  void keyPressEvent(QKeyEvent *event) override;
  int heightForWidth(int width) const override;

  void paintSelectedTopicItem(QPainter *p, const TopicEditorBase::TopicData &data);
  QRect handleRect(const TopicEditorBase::TopicData &data, const HandleType &ht);
  QRect topicItemRect(const TopicEditorBase::TopicData &data);

  bool checkConstraints(TopicEditorBase::TopicData &selected);
  void setCursorFromHandleType(const HandleType &ht);
  double oneWidthPixelInPercent();
  double oneHeightPixelInPercent();

  void unselect();
  void findSelection(const QPoint &pos); // looks for Topic(s) on the clicked position and selects those Topics
  void internalSelectTopic(int topicId);

  void setValues(const TopicEditorBase::TopicData &data, const QPoint &pos);
  void affect(TopicEditorBase::TopicData &selected, const Affection &affection, const QPoint &pos);
  void deleteTopicItem(const TopicEditorBase::TopicData &data);

public slots:
  void incIndex(const TopicEditorBase::TopicData &selected);
  void decIndex(const TopicEditorBase::TopicData &selected);
  void toFront(const TopicEditorBase::TopicData &selected);
  void toBack(const TopicEditorBase::TopicData &selected);

signals:
  void deleteTopicItem(int topicId);
  void topicSelected(int topicId);
  void unselected();
  void changesMade();

private:
  QLinkedList<TopicEditorBase::TopicData> m_topicDataList;
  int m_selectedTopicId; // must be inside the list....
  int m_lowestImportIndex;

  HandleType m_currentResizeHandle;
  HandleType m_resizeHandleActive; // saves us code dups
  QPointF m_wholeOrgPos;
  QPointer<QWidget> m_drawWidgetPreviewContent;
  QScrollArea *m_scrollArea{nullptr};

};

} // namespace PresentationManagement