/*
	Copyright 2006-2021 The QElectroTech Team
	This file is part of QElectroTech.

	QElectroTech is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 2 of the License, or
	(at your option) any later version.

	QElectroTech is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef LINKSINGLEELEMENTWIDGET_H
#define LINKSINGLEELEMENTWIDGET_H

#include "../properties/elementdata.h"
#include "abstractelementpropertieseditorwidget.h"

#include <QHash>

class QTreeWidgetItem;
class Element;
class QMenu;

namespace Ui {
	class LinkSingleElementWidget;
}

/**
	@brief The LinkSingleElementWidget class
	this class provide a widget to select an element to be linked
	to the element given in the constructor.
	The element given in constructor must be linked with only
	one other element (like report or slave element).
	This widget detect automatically the kind of element given in
	the constructor and search all element that can be linked with it.
	If the element is already linked, the widget ask user to unlink.
	This widget embedded the diagram command for undo/redo the action
*/
class LinkSingleElementWidget : public AbstractElementPropertiesEditorWidget
{
	Q_OBJECT

		///Methods
	public:
		explicit LinkSingleElementWidget(Element *elmt,
						 QWidget *parent = nullptr);
		~LinkSingleElementWidget() override;

		void setElement (Element *element) override;
		void apply() override;
		QUndoCommand *associatedUndo() const override;
		QString title() const override;

	public slots:
		void updateUi() override;
		void buildTree();

	public:
		bool setLiveEdit(bool live_edit) override;

	private :
		QVector <QPointer<Element>> availableElements();
		void setUpCompleter();
		void clearTreeWidget();
		void setUpHeaderLabels();

	private slots:
		void diagramWasRemovedFromProject();
		void showedElementWasDeleted();
		void linkTriggered();
		void hideButtons();
		void showButtons();
		void headerCustomContextMenuRequested(const QPoint &pos);

		void on_m_unlink_pb_clicked();
		void on_m_tree_widget_itemDoubleClicked(QTreeWidgetItem *item, int column);
		void on_m_tree_widget_customContextMenuRequested(const QPoint &pos);
		void on_m_show_linked_pb_clicked();
		void on_m_show_this_pb_clicked();

		void on_m_search_field_textEdited(const QString &arg1);

	private:
	Ui::LinkSingleElementWidget *ui;

	bool m_unlink = false;
	ElementData::Type m_filter;

	QHash <QTreeWidgetItem*, Element*> m_qtwi_elmt_hash;
	QHash <QTreeWidgetItem*, QStringList> m_qtwi_strl_hash;

	QTreeWidgetItem *m_qtwi_at_context_menu = nullptr,
					*m_pending_qtwi = nullptr;

	Element *m_showed_element = nullptr,
			*m_element_to_link = nullptr;

	QMenu *m_context_menu{nullptr};
	QAction *m_link_action{nullptr},
			*m_show_qtwi{nullptr},
			*m_show_element{nullptr},
			*m_save_header_state{nullptr};
};

#endif // LINKSINGLEELEMENTWIDGET_H