/* This file is part of the KDE project
   Copyright (C) 2005-2006 Jaroslaw Staniek <js@iidea.pl>

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this program; see the file COPYING.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
*/

#include "dbproperties.h"
#include <klocale.h>

using namespace KexiDB;

DatabaseProperties::DatabaseProperties(Connection *conn)
 : KexiDB::Object()
 , m_conn(conn)
{
}

DatabaseProperties::~DatabaseProperties()
{
}

bool DatabaseProperties::setValue( const QString& _name, const QVariant& value )
{
	QString name(_name.stripWhiteSpace());
	bool ok;
	//we need to know whether update or insert
	bool exists = m_conn->resultExists(
		QString::fromLatin1("SELECT 1 FROM kexi__db WHERE db_property=%1")
			.arg(m_conn->driver()->escapeString(name)), ok);
	if (!ok) {
		setError(m_conn, i18n("Could not set value of database property \"%1\".").arg(name));
		return false;
	}

	if (exists) {
		if (!m_conn->executeSQL(
			QString::fromLatin1("UPDATE kexi__db SET db_value=%1 WHERE db_property=%2")
			.arg(m_conn->driver()->escapeString(value.toString()))
			.arg(m_conn->driver()->escapeString(name))))
		{
			setError(m_conn, i18n("Could not set value of database property \"%1\".").arg(name));
			return false;
		}
		return true;
	}

	if (!m_conn->executeSQL(
		QString::fromLatin1("INSERT INTO kexi__db (db_property, db_value) VALUES (%1, %2)")
		.arg(m_conn->driver()->escapeString(name))
		.arg(m_conn->driver()->escapeString(value.toString()))))
	{
		setError(m_conn, i18n("Could not set value of database property \"%1\".").arg(name));
		return false;
	}
	return true;
}

bool DatabaseProperties::setCaption( const QString& _name, const QString& caption )
{
	QString name(_name.stripWhiteSpace());
	//captions have ' ' prefix
	name.prepend(" ");
	bool ok;
	//we need to know whether update or insert
	bool exists = m_conn->resultExists(
		QString::fromLatin1("SELECT 1 FROM kexi__db WHERE db_property=%1")
			.arg(m_conn->driver()->escapeString(name)), ok);
	if (!ok) {
		setError(m_conn, i18n("Could not set caption for database property \"%1\".").arg(name));
		return false;
	}

	if (exists) {
		if (!m_conn->executeSQL(
			QString::fromLatin1("UPDATE kexi__db SET db_value=%1 WHERE db_property=%2")
			.arg(m_conn->driver()->escapeString(caption))
			.arg(m_conn->driver()->escapeString(name))))
		{
			setError(m_conn, i18n("Could not set caption for database property \"%1\".").arg(name));
			return false;
		}
		return true;
	}

	if (!m_conn->executeSQL(
		QString::fromLatin1("INSERT INTO kexi__db (db_property, db_value) VALUES (%1, %2)")
		.arg(m_conn->driver()->escapeString(name))
		.arg(m_conn->driver()->escapeString(caption))))
	{
		setError(m_conn, i18n("Could not set caption for database property \"%1\".").arg(name));
		return false;
	}
	return true;
}

QVariant DatabaseProperties::value( const QString& _name )
{
	QString result;
	QString name(_name.stripWhiteSpace());
	if (true!=m_conn->querySingleString(
		QString::fromLatin1("SELECT db_value FROM kexi__db WHERE db_property=")
		+ m_conn->driver()->escapeString(name), result)) {
		m_conn->setError(ERR_NO_DB_PROPERTY, i18n("Could not read database property \"%1\".").arg(name));
		return QVariant();
	}
	return result;
}

QString DatabaseProperties::caption( const QString& _name )
{
	QString result;
	QString name(_name.stripWhiteSpace());
	//captions have ' ' prefix
	name.prepend(" ");
	if (true!=m_conn->querySingleString(
		QString::fromLatin1("SELECT db_value FROM kexi__db WHERE db_property=")
		+ m_conn->driver()->escapeString(name), result)) {
		setError(m_conn, i18n("Could not read database property \"%1\".").arg(name));
		return QString::null;
	}
	return result;
}

QStringList DatabaseProperties::names()
{
	QStringList result;
	if (true!=m_conn->queryStringList(
		QString::fromLatin1("SELECT db_value FROM kexi__db WHERE db_property NOT LIKE ")
		    + m_conn->driver()->escapeString(QString::fromLatin1(" %%")), result, 0 /*0-th*/)) {
		//                                                        ^^ exclude captions
		setError(m_conn, i18n("Could not read database properties."));
		return QStringList();
	}
	return result;
}