/* This file is part of the KDE project
   Copyright (C) 2007 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 <klocale.h>

#include "kexitextformatter.h"
#include <widget/utils/kexidatetimeformatter.h>
#include <kexidb/utils.h>

//! @internal
class KexiTextFormatter::Private
{
	public:
		Private() : field(0), dateFormatter(0), timeFormatter(0)
		{
		}
		
		~Private()
		{
			delete dateFormatter;
			delete timeFormatter;
		}

		KexiDB::Field* field;
		KexiDateFormatter *dateFormatter;
		KexiTimeFormatter *timeFormatter;
};

KexiTextFormatter::KexiTextFormatter()
 : d( new Private )
{
}

KexiTextFormatter::~KexiTextFormatter()
{
	delete d;
}

void KexiTextFormatter::setField( KexiDB::Field* field )
{
	d->field = field;
	if (!d->field)
		return;
	if (d->field->type() == KexiDB::Field::Date || d->field->type() == KexiDB::Field::DateTime)
		d->dateFormatter = new KexiDateFormatter();
	else {
		delete d->dateFormatter;
		d->dateFormatter = 0;
	}
	if (d->field->type() == KexiDB::Field::Time || d->field->type() == KexiDB::Field::DateTime)
		d->timeFormatter = new KexiTimeFormatter();
	else {
		delete d->timeFormatter;
		d->timeFormatter = 0;
	}
}

QString KexiTextFormatter::valueToText(const QVariant& value, const QString& add) const
{
	//cases, in order of expected frequency
	if (!d->field || d->field->isTextType())
		return value.toString() + add;
	else if (d->field->isIntegerType()) {
		if (value.toInt() == 0)
			return add; //eat 0
	}
	else if (d->field->isFPNumericType()) {
//! @todo precision!
//! @todo support 'g' format
		if (value.toDouble() == 0.0)
			return add.isEmpty() ? "0" : add; //eat 0
#if 0 //moved to KexiDB::formatNumberForVisibleDecimalPlaces()
		QString text( QString::number(value.toDouble(), 'f', 
			QMAX(d->field->visibleDecimalPlaces(), 10)) ); //!<-- 10 is quite good maximum for fractional digits 
			                                            //!< @todo add command line settings?
//! @todo (js): get decimal places settings here...
		QStringList sl = QStringList::split(".", text);
			//nothing
		}
		else if (sl.count()==2) {
//				kdDebug() << "sl.count()=="<<sl.count()<< " " <<sl[0] << " | " << sl[1] << endl;
			const QString sl1 = sl[1];
			int pos = sl1.length()-1;
			if (pos>=1) {
				for (;pos>=0 && sl1[pos]=='0';pos--)
					;
				pos++;
			}
			if (pos>0)
				text = sl[0] + m_decsym + sl1.left(pos);
			else
				text = sl[0]; //no decimal point
		}
#endif
		return KexiDB::formatNumberForVisibleDecimalPlaces( 
			value.toDouble(), d->field->visibleDecimalPlaces() ) + add;
	}
	else if (d->field->type() == KexiDB::Field::Boolean) {
//! @todo temporary solution for booleans!
		const bool boolValue = value.isNull() ? QVariant(add).toBool() : value.toBool();
		return boolValue ? "1" : "0";
	}
	else if (d->field->type() == KexiDB::Field::Date) {
		return d->dateFormatter->dateToString( value.toString().isEmpty() ? QDate() : value.toDate() );
	}
	else if (d->field->type() == KexiDB::Field::Time) {
		return d->timeFormatter->timeToString( 
			//hack to avoid converting null variant to valid QTime(0,0,0)
			value.toString().isEmpty() ? value.toTime() : QTime(99,0,0) );
	}
	else if (d->field->type() == KexiDB::Field::DateTime) {
		if (value.toString().isEmpty() )
			return add;
		return d->dateFormatter->dateToString( value.toDateTime().date() ) + " " +
			d->timeFormatter->timeToString( value.toDateTime().time() );
	}
	else if (d->field->type() == KexiDB::Field::BigInteger) {
		if (value.toLongLong() == 0)
			return add; //eat 0
	}
	//default: text
	return value.toString() + add;
}

QVariant KexiTextFormatter::textToValue(const QString& text) const
{
	if (!d->field)
		return QVariant();
	const KexiDB::Field::Type t = d->field->type();
	switch (t) {
	case KexiDB::Field::Text:
	case KexiDB::Field::LongText:
		return text;
	case KexiDB::Field::Byte:
	case KexiDB::Field::ShortInteger:
		return text.toShort();
//! @todo uint, etc?
	case KexiDB::Field::Integer:
		return text.toInt();
	case KexiDB::Field::BigInteger:
		return text.toLongLong();
	case KexiDB::Field::Boolean:
//! @todo temporary solution for booleans!
		return text == "1" ? QVariant(true,1) : QVariant(false,0);
	case KexiDB::Field::Date:
		return d->dateFormatter->stringToVariant( text );
	case KexiDB::Field::Time:
		return d->timeFormatter->stringToVariant( text );
	case KexiDB::Field::DateTime:
		return stringToDateTime(*d->dateFormatter, *d->timeFormatter, text);
	case KexiDB::Field::Float:
	case KexiDB::Field::Double: {
		// replace custom decimal symbol with '.' as required by to{Float|Double}()
		QString fixedText( text );
		fixedText.replace(KGlobal::locale()->decimalSymbol(), ".");
		if (t == KexiDB::Field::Double)
			return fixedText.toDouble();
		return fixedText.toFloat();
	}
	default:
		return text;
	}
//! @todo more data types!
}

bool KexiTextFormatter::valueIsEmpty(const QString& text) const
{
	if (text.isEmpty())
		return true;

	if (d->field) {
		const KexiDB::Field::Type t = d->field->type();
		if (t == KexiDB::Field::Date)
			return d->dateFormatter->isEmpty( text );
		else if (t == KexiDB::Field::Time)
			return d->timeFormatter->isEmpty( text );
		else if (t == KexiDB::Field::Time)
			return dateTimeIsEmpty( *d->dateFormatter, *d->timeFormatter, text );
	}

//! @todo
	return text.isEmpty();
}

bool KexiTextFormatter::valueIsValid(const QString& text) const
{
	if (!d->field)
		return true;
//! @todo fix for fields with "required" property = true
	if (valueIsEmpty(text)/*ok?*/)
		return true;

	const KexiDB::Field::Type t = d->field->type();
	if (t == KexiDB::Field::Date)
		return d->dateFormatter->stringToVariant( text ).isValid();
	else if (t == KexiDB::Field::Time)
		return d->timeFormatter->stringToVariant( text ).isValid();
	else if (t == KexiDB::Field::DateTime)
		return dateTimeIsValid( *d->dateFormatter, *d->timeFormatter, text );

//! @todo
	return true;
}

QString KexiTextFormatter::inputMask() const
{
	const KexiDB::Field::Type t = d->field->type();
	if (t==KexiDB::Field::Date) {
//! @todo use KDateWidget?
		return d->dateFormatter->inputMask();
	}
	else if (t==KexiDB::Field::Time) {
//! @todo use KTimeWidget
		d->timeFormatter->inputMask();
	}
	else if (t==KexiDB::Field::DateTime) {
		dateTimeInputMask( *d->dateFormatter, *d->timeFormatter );
	}
	return QString::null;
}