#ifndef SQLDOCUMENT_H
#define SQLDOCUMENT_H

#include <QList>
#include <QObject>
#include <QString>

class QTextDocument;
class QWidget;
class SqlSyntaxHighlighter;

/** Owns the text of a SQL script together with its file state.
 * Several query tools (editors) can show the same document, they all
 * use the same QTextDocument.
 */
class SqlDocument : public QObject {
	Q_OBJECT
public:
	explicit SqlDocument(QObject *parent = nullptr);
	~SqlDocument() override;

	QTextDocument *textDocument() const { return m_document; }
	SqlSyntaxHighlighter *highlighter() const { return m_highlighter; }

	QString fileName() const { return m_fileName; }
	bool isNew() const { return m_new; }
	bool isModified() const;
	void setModified(bool modified);

	/// Empties the document and makes it a new unnamed document.
	void clear();
	bool load(const QString &filename);
	/// Save the document under its current name, a file save dialog will be shown if this is a new document
	bool save(QWidget *parent);
	/// Saves the document under a new name and continue editing the document under this new name.
	bool saveAs(QWidget *parent);
	/// Save the document under a new name but continue editing the document under its old name.
	bool saveCopyAs(QWidget *parent);

	void addEditor(QWidget *editor);
	void removeEditor(QWidget *editor);
	const QList<QWidget*> &editors() const { return m_editors; }

signals:
	void modifiedChanged(bool modified);
	void fileNameChanged();

private:
	QTextDocument *m_document;
	SqlSyntaxHighlighter *m_highlighter;
	QString m_fileName;
	bool m_new = true;
	QList<QWidget*> m_editors;

	void setFileName(const QString &filename);
	bool saveSqlTo(const QString &filename);
	QString promptUserForSaveSqlFilename(QWidget *parent);
};

#endif // SQLDOCUMENT_H