// 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 Line;
class DiagramItem;
class DiagramObject;

class QPainter;
class QPrinter;

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

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

	enum Notation {
		Relational,
		CrowsFoot
	};

	//! Returns the notation used in the diagram
	Notation notation() const;

	//! Sets the notation used in the diagram
	void setNotation(Notation);

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

	DatabaseTable *selectedTable();
	void deleteSelectedItems();

	QList<DiagramItem *> selectedItems();

	void save(const QString &fileName);
	bool 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<Line *> 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);

	bool isPrinting() const;
	void setPrinting(bool printing);

	void addItemLater(DiagramItem *item);
	void removeItemLater(DiagramItem *item);

    void print(QPainter *painter, const QRectF &target = QRectF(), const QRectF &source = QRectF());
    void print(QPrinter *printer, const QRectF &target = QRectF(), const QRectF &source = QRectF());

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

	friend class DatabaseTable;

public slots:
	void updatePositions(DiagramObject *object, bool force = false);
	void updateLineLayout(Line *line);

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

private slots:
	void _updateLines();

private:
	class DiagramDocumentPrivate;
	DiagramDocumentPrivate *const d;

	void updateLines(QSet<DiagramObject *> objects);
	
	bool m_trackingMoves;
	QMap<DiagramItem *, QPointF> m_movedItems;

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

#endif