/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (the "License"); you may not use this file

 *   except in compliance with the License. You may obtain a copy of

 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .

 */

#include <SvgNumber.hxx>

#include <o3tl/unit_conversion.hxx>

#include <sal/log.hxx>

namespace svgio::svgreader

{

double SvgNumber::solveNonPercentage(const InfoProvider& rInfoProvider) const

{

    if (!isSet())

    {

        SAL_WARN("svgio", "SvgNumber not set (!)");

        return 0.0;

    }

    switch (meUnit)

    {

        // See https://drafts.csswg.org/css-values-4/#font-relative-length

        case SvgUnit::em:

            return mfNumber * rInfoProvider.getCurrentFontSize();

        case SvgUnit::ex:

            return mfNumber * rInfoProvider.getCurrentXHeight();

        case SvgUnit::px:

            return mfNumber;

        case SvgUnit::pt:

            return o3tl::convert(mfNumber, o3tl::Length::pt, o3tl::Length::px);

        case SvgUnit::pc:

            return o3tl::convert(mfNumber, o3tl::Length::pc, o3tl::Length::px);

        case SvgUnit::cm:

            return o3tl::convert(mfNumber, o3tl::Length::cm, o3tl::Length::px);

        case SvgUnit::mm:

            return o3tl::convert(mfNumber, o3tl::Length::mm, o3tl::Length::px);

        case SvgUnit::in:

            return o3tl::convert(mfNumber, o3tl::Length::in, o3tl::Length::px);

        case SvgUnit::none:

        {

            SAL_WARN("svgio", "Design error, this case should have been handled in the caller");

            return mfNumber;

        }

        case SvgUnit::percent:

        {

            SAL_WARN("svgio", "Do not use with percentage!");

            break;

        }

    }

    return 0.0;

}

double SvgNumber::solve(const InfoProvider& rInfoProvider, NumberType aNumberType) const

{

    if (!isSet())

    {

        SAL_WARN("svgio", "SvgNumber not set (!)");

        return 0.0;

    }

    if (meUnit == SvgUnit::percent)

    {

        double fRetval(mfNumber * 0.01);

        basegfx::B2DRange aViewPort = rInfoProvider.getCurrentViewPort();

        if ( aViewPort.isEmpty() )

        {

            SAL_WARN("svgio", "Design error, this case should have been handled in the caller");

            // no viewPort, assume a normal page size (A4)

            aViewPort = basegfx::B2DRange(

                0.0,

                0.0,

                o3tl::convert(210.0, o3tl::Length::cm, o3tl::Length::px), // should it be mm?

                o3tl::convert(297.0, o3tl::Length::cm, o3tl::Length::px));

        }

        if ( !aViewPort.isEmpty() )

        {

            if (NumberType::xcoordinate == aNumberType)

            {

                // it's a x-coordinate, relative to current width (w)

                fRetval *= aViewPort.getWidth();

            }

            else if (NumberType::ycoordinate == aNumberType)

            {

                // it's a y-coordinate, relative to current height (h)

                fRetval *= aViewPort.getHeight();

            }

            else // length

            {

                // it's a length, relative to sqrt((w^2 + h^2)/2)

                const double fDiagLength(std::hypot(aViewPort.getWidth(), aViewPort.getHeight()));

                fRetval *= fDiagLength / M_SQRT2;

            }

        }

        return fRetval;

    }

    return solveNonPercentage( rInfoProvider);

}

} // end of namespace svgio::svgreader

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