// Copyright (C) 2008  Lukas Lalinsky
//
// This program 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.
//
// This program 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 this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

#ifndef DATABASEMODEL_H
#define DATABASEMODEL_H

#include <QUndoStack>
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QDomDocument>
#include <QGraphicsLineItem>
#include <QSet>
#include <QUuid>

class DatabaseTable;
class DatabaseRelationship;
class DiagramConnection;
class DiagramItem;
class DiagramObject;

class DiagramDocument : public QGraphicsScene
{
	Q_OBJECT
	Q_PROPERTY(int gridSize READ gridSize WRITE setGridSize)
	Q_PROPERTY(bool gridVisible READ isGridVisible WRITE setGridVisible)
	Q_PROPERTY(QColor gridColor READ gridColor WRITE setGridColor)

public:
	DiagramDocument(QObject *parent = 0);
	
	enum Mode {
		Select = 0,
		AddTable,
		AddRelation
	};

	Mode mode();
	void setMode(Mode mode);

	DatabaseTable *selectedTable();
	void deleteSelectedItems();

	void save(const QString &fileName);
	void load(const QString &fileName);

	QString fileName() { return m_fileName; }
	void setFileName(const QString &fileName) { m_fileName = fileName; }

	DiagramItem *itemById(const QUuid &id);

	QUndoStack *undoStack() const { return m_undoStack; }

	void itemMoved(DiagramItem *table);
	void itemHasMoved(DiagramItem *table);

	QList<DiagramConnection *> findConnections(DiagramObject *object);
	template <class T> QList<T *> itemsByType();

	int gridSize() const;
	void setGridSize(int size);

	bool isGridVisible() const;
	void setGridVisible(bool visible);

	QColor gridColor() const;
	void setGridColor(const QColor &color);

signals:
	void modeChanged(DiagramDocument::Mode mode);

	friend class DatabaseTable;

protected slots:
	void updatePositions(DiagramObject *object);

protected:
	void mousePressEvent(QGraphicsSceneMouseEvent *event);
	void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
	void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);

	void drawBackground(QPainter *painter, const QRectF &rect);

private:
	class DiagramDocumentPrivate;
	DiagramDocumentPrivate *const d;

	bool m_trackingMoves;
	QMap<DiagramItem *, QPointF> m_movedItems;

	QUndoStack *m_undoStack;
	Mode m_mode;
	QString m_fileName;
	QGraphicsLineItem *m_line;
};

#endif