/* -*- 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 "svgfontexport.hxx"
#include "svgfilter.hxx"
#include "svgwriter.hxx"

#include <vcl/unohelp.hxx>
#include <vcl/font.hxx>
#include <vcl/metric.hxx>
#include <vcl/outdev.hxx>
#include <vcl/settings.hxx>
#include <i18nlangtag/languagetag.hxx>
#include <xmloff/namespacemap.hxx>
#include <o3tl/string_view.hxx>

#include <com/sun/star/i18n/CharacterIteratorMode.hpp>
#include <com/sun/star/i18n/XBreakIterator.hpp>

const sal_Int32 nFontEM = 2048;


SVGFontExport::SVGFontExport( SVGExport& rExport, ::std::vector< ObjectRepresentation >&& rObjects ) :
    mrExport( rExport ),
    maObjects( std::move(rObjects) ),
    mnCurFontId( 0 )
{
}


SVGFontExport::~SVGFontExport()
{
}


SVGFontExport::GlyphSet& SVGFontExport::implGetGlyphSet( const vcl::Font& rFont )
{
    FontWeight      eWeight( WEIGHT_NORMAL );
    FontItalic      eItalic( ITALIC_NONE );
    const OUString& aFontName( rFont.GetFamilyName() );

    switch( rFont.GetWeight() )
    {
        case WEIGHT_BOLD:
        case WEIGHT_ULTRABOLD:
        case WEIGHT_BLACK:
            eWeight = WEIGHT_BOLD;
        break;

        default:
        break;
    }

    if( rFont.GetItalic() != ITALIC_NONE )
        eItalic = ITALIC_NORMAL;

    return( maGlyphTree[ aFontName.getToken( 0, ';' ) ][ eWeight ][ eItalic ] );
}


void SVGFontExport::implCollectGlyphs()
{
    ScopedVclPtrInstance< VirtualDevice > pVDev;

    pVDev->EnableOutput( false );

    for (auto const& elem : maObjects)
    {
        if( elem.HasRepresentation() )
        {
            const GDIMetaFile& rMtf = elem.GetRepresentation();

            auto popIt = pVDev->ScopedPush();

            for( size_t i = 0, nCount = rMtf.GetActionSize(); i < nCount; ++i )
            {
                OUString             aText;
                MetaAction*          pAction = rMtf.GetAction( i );
                const MetaActionType nType = pAction->GetType();

                switch( nType )
                {
                    case MetaActionType::TEXT:
                    {
                        const MetaTextAction* pA = static_cast<const MetaTextAction*>(pAction);
                        sal_Int32             aLength=std::min( pA->GetText().getLength(), pA->GetLen() );
                        aText = pA->GetText().copy( pA->GetIndex(), aLength );
                    }
                    break;

                    case MetaActionType::TEXTRECT:
                    {
                        const MetaTextRectAction* pA = static_cast<const MetaTextRectAction*>(pAction);
                        aText = pA->GetText();
                    }
                    break;

                    case MetaActionType::TEXTARRAY:
                    {
                        const MetaTextArrayAction*  pA = static_cast<const MetaTextArrayAction*>(pAction);
                        sal_Int32                   aLength=std::min( pA->GetText().getLength(), pA->GetLen() );
                        aText = pA->GetText().copy( pA->GetIndex(), aLength );
                    }
                    break;

                    case MetaActionType::STRETCHTEXT:
                    {
                        const MetaStretchTextAction* pA = static_cast<const MetaStretchTextAction*>(pAction);
                        sal_Int32                    aLength=std::min( pA->GetText().getLength(), pA->GetLen() );
                        aText = pA->GetText().copy( pA->GetIndex(), aLength );
                    }
                    break;

                    default:
                        pAction->Execute( pVDev );
                    break;
                }

                if( !aText.isEmpty() )
                {
                    GlyphSet& rGlyphSet = implGetGlyphSet( pVDev->GetFont() );
                    css::uno::Reference< css::i18n::XBreakIterator > xBI(
                        vcl::unohelper::CreateBreakIterator() );

                    if( xBI.is() )
                    {
                        const css::lang::Locale&   rLocale = Application::GetSettings().GetLanguageTag().getLocale();
                        sal_Int32                               nCurPos = 0, nLastPos = -1;

                        while( ( nCurPos < aText.getLength() ) && ( nCurPos > nLastPos ) )
                        {
                            sal_Int32 nCount2 = 1;

                            nLastPos = nCurPos;
                            nCurPos = xBI->nextCharacters( aText, nCurPos, rLocale,
                                                           css::i18n::CharacterIteratorMode::SKIPCELL,
                                                           nCount2, nCount2 );

                            rGlyphSet.insert( aText.copy( nLastPos, nCurPos - nLastPos ) );
                        }
                    }
                    else
                    {
                        const sal_Unicode* pStr = aText.getStr();

                        for( sal_uInt32 k = 0, nLen = aText.getLength(); k < nLen; ++k )
                            rGlyphSet.insert( OUString( pStr[ k ] ) );
                    }
                }
            }
        }
    }
}


void SVGFontExport::implEmbedFont( const vcl::Font& rFont )
{
    if( !mrExport.IsEmbedFonts() )
        return;

    GlyphSet& rGlyphSet = implGetGlyphSet( rFont );

    if( rGlyphSet.empty() )
        return;

    {
        SvXMLElementExport aExp(mrExport, u"defs"_ustr, true, true);
        OUString     aCurIdStr( u"EmbeddedFont_"_ustr );
        OUString     aUnitsPerEM( OUString::number( nFontEM ) );
        ScopedVclPtrInstance< VirtualDevice > pVDev;
        vcl::Font           aFont( rFont );

        aFont.SetFontSize( Size( 0, nFontEM ) );
        aFont.SetAlignment( ALIGN_BASELINE );

        pVDev->SetMapMode(MapMode(MapUnit::Map100thMM));
        pVDev->SetFont( aFont );

        aCurIdStr += OUString::number( ++mnCurFontId );
        mrExport.AddAttribute(u"id"_ustr, aCurIdStr);
        mrExport.AddAttribute(u"horiz-adv-x"_ustr, aUnitsPerEM);

        {
            SvXMLElementExport aExp2(mrExport, u"font"_ustr, true, true);
            OUString     aFontWeight;
            OUString     aFontStyle;
            const Size         aSize( nFontEM, nFontEM );

            // Font Weight
            if( aFont.GetWeightMaybeAskConfig() != WEIGHT_NORMAL )
                aFontWeight = "bold";
            else
                aFontWeight = "normal";

            // Font Italic
            if( aFont.GetItalicMaybeAskConfig() != ITALIC_NONE )
                aFontStyle = "italic";
            else
                aFontStyle = "normal";

            mrExport.AddAttribute( u"font-family"_ustr, GetMappedFontName( rFont.GetFamilyName() ) );
            mrExport.AddAttribute( u"units-per-em"_ustr, aUnitsPerEM );
            mrExport.AddAttribute( u"font-weight"_ustr, aFontWeight );
            mrExport.AddAttribute( u"font-style"_ustr, aFontStyle );
            mrExport.AddAttribute( u"ascent"_ustr, OUString::number( pVDev->GetFontMetric().GetAscent() ) );
            mrExport.AddAttribute( u"descent"_ustr, OUString::number( pVDev->GetFontMetric().GetDescent() ) );

            {
                SvXMLElementExport aExp3(mrExport, u"font-face"_ustr, true, true);
            }

            mrExport.AddAttribute(u"horiz-adv-x"_ustr, OUString::number(aSize.Width()));

            {
                const Point         aPos;
                const tools::PolyPolygon   aMissingGlyphPolyPoly( tools::Rectangle( aPos, aSize ) );

                mrExport.AddAttribute( u"d"_ustr, SVGActionWriter::GetPathString( aMissingGlyphPolyPoly, false ) );

                {
                    SvXMLElementExport aExp4(mrExport, u"missing-glyph"_ustr, true, true);
                }
            }
            for (auto const& glyph : rGlyphSet)
            {
                implEmbedGlyph( *pVDev, glyph);
            }
        }
    }
}


void SVGFontExport::implEmbedGlyph( OutputDevice const & rOut, const OUString& rCellStr )
{
    tools::PolyPolygon         aPolyPoly;

    if( !rOut.GetTextOutline( aPolyPoly, rCellStr ) )
        return;

    tools::Rectangle aBoundRect;

    aPolyPoly.Scale( 1.0, -1.0 );

    if (rCellStr == " " || !rOut.GetTextBoundRect(aBoundRect, rCellStr))
        aBoundRect = tools::Rectangle( Point( 0, 0 ), Size( rOut.GetTextWidth( rCellStr ), 0 ) );

    mrExport.AddAttribute(u"unicode"_ustr, rCellStr);
    mrExport.AddAttribute(u"horiz-adv-x"_ustr, OUString::number(aBoundRect.GetWidth()));

    const OUString aPathString( SVGActionWriter::GetPathString( aPolyPoly, false ) );
    if( !aPathString.isEmpty() )
    {
        mrExport.AddAttribute(u"d"_ustr, aPathString);
    }

    {
        SvXMLElementExport aExp(mrExport, u"glyph"_ustr, true, true);
    }
}


void SVGFontExport::EmbedFonts()
{
    implCollectGlyphs();

    for (auto const& glyph : maGlyphTree)
    {
        const FontWeightMap&            rFontWeightMap = glyph.second;
        for (auto const& fontWeight : rFontWeightMap)
        {
            const FontItalicMap&            rFontItalicMap = fontWeight.second;
            for (auto const& fontItalic : rFontItalicMap)
            {
                vcl::Font aFont;

                aFont.SetFamilyName( glyph.first );
                aFont.SetWeight( fontWeight.first );
                aFont.SetItalic( fontItalic.first );

                implEmbedFont( aFont );
            }
        }
    }
}


OUString SVGFontExport::GetMappedFontName( std::u16string_view rFontName ) const
{
    OUString aRet( o3tl::getToken(rFontName, 0, ';' ) );

    if( mnCurFontId )
        aRet += " embedded";

    return aRet;
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
