/**
 * \file lyxgluelength.C
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author Lars Gullik Bjønnes
 * \author Matthias Ettrich
 * \author John Levon
 *
 * Full author contact details are available in file CREDITS.
 */

#include <config.h>

#include "lyxgluelength.h"
#include "lengthcommon.h"

#include <sstream>

using std::ostringstream;
using std::string;


LyXGlueLength::LyXGlueLength(LyXLength const & len)
	: len_(len)
{}


LyXGlueLength::LyXGlueLength(LyXLength const & len, LyXLength const & plus,
		LyXLength const & minus)
	: len_(len), plus_(plus), minus_(minus)
{}


LyXGlueLength::LyXGlueLength(string const & data)
{
	isValidGlueLength(data, this);
}


string const LyXGlueLength::asString() const
{
	ostringstream buffer;

	buffer << len_.value();

	if (plus_.zero() && minus_.zero()) {
		buffer << unit_name[len_.unit()];
		return buffer.str();
	}

	// just len and plus
	if (minus_.zero()) {
		if (len_.unit() != plus_.unit())
			buffer << unit_name[len_.unit()];
		buffer << '+' << plus_.value();
		buffer << unit_name[plus_.unit()];
		return buffer.str();
	}

	// just len and minus
	if (plus_.zero()) {
		if (len_.unit() != minus_.unit())
			buffer << unit_name[len_.unit()];
		buffer << '-' << minus_.value();
		buffer << unit_name[minus_.unit()];
		return buffer.str();
	}

	// ok, len, plus AND minus

	// len+-
	if (minus_ == plus_) {
		if (len_.unit() != minus_.unit())
			buffer << unit_name[len_.unit()];
		buffer << "+-" << minus_.value();
		buffer << unit_name[minus_.unit()];
		return buffer.str();
	}

	// this is so rare a case, why bother minimising units ?

	buffer << unit_name[len_.unit()];
	buffer << '+' << plus_.value() << unit_name[plus_.unit()];
	buffer << '-' << minus_.value() << unit_name[minus_.unit()];

	return buffer.str();
}


string const LyXGlueLength::asLatexString() const
{
	ostringstream buffer;

	buffer << len_.value() << unit_name[len_.unit()];

	if (!plus_.zero())
		buffer << " plus " << plus_.value() << unit_name[plus_.unit()];
	if (!minus_.zero())
		buffer << " minus " << minus_.value() << unit_name[minus_.unit()];
	return buffer.str();
}


LyXLength const & LyXGlueLength::len() const
{
	return len_;
}


LyXLength const & LyXGlueLength::plus() const
{
	return plus_;
}


LyXLength const & LyXGlueLength::minus() const
{
	return minus_;
}


bool operator==(LyXGlueLength const & l1, LyXGlueLength const & l2)
{
	return l1.len() == l2.len()
		 && l1.plus() == l2.plus()
		 && l1.minus() == l2.minus();
}


bool operator!=(LyXGlueLength const & l1, LyXGlueLength const & l2)
{
	return !(l1 == l2);
}