/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * This file is part of the Collabora Office 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 <sal/config.h>

#include <com/sun/star/graphic/XSvgParser.hpp>
#include <com/sun/star/lang/XServiceInfo.hpp>
#include <com/sun/star/lang/XInitialization.hpp>
#include <comphelper/processfactory.hxx>
#include <cppuhelper/implbase.hxx>
#include <cppuhelper/supportsservice.hxx>
#include <com/sun/star/xml/sax/XParser.hpp>
#include <com/sun/star/xml/sax/Parser.hpp>
#include <com/sun/star/xml/sax/InputSource.hpp>
#include <svgdocumenthandler.hxx>
#include <comphelper/diagnose_ex.hxx>
#include <rtl/ref.hxx>
#include <tools/stream.hxx>
#include <unotools/streamwrap.hxx>

#include <svgvisitor.hxx>
#include <utility>

using namespace ::com::sun::star;

namespace svgio::svgreader
{
        namespace {

        class XSvgParser : public ::cppu::WeakImplHelper< graphic::XSvgParser, lang::XServiceInfo >
        {
        private:
            std::shared_ptr<SvgDrawVisitor> mpVisitor;

            uno::Reference< uno::XComponentContext > context_;
            bool parseSvgXML(uno::Reference<io::XInputStream> const & xSVGStream,
                             uno::Reference<xml::sax::XDocumentHandler> const & xSvgDocHdl);
        public:
            explicit XSvgParser(
                uno::Reference< uno::XComponentContext > context);
            XSvgParser(const XSvgParser&) = delete;
            XSvgParser& operator=(const XSvgParser&) = delete;

            // XSvgParser
            virtual cpo::uno::Sequence< uno::Reference< ::graphic::XPrimitive2D > > SAL_CALL getDecomposition(
                const uno::Reference< ::io::XInputStream >& xSVGStream,
                const OUString& aAbsolutePath) override;

            virtual cpo::uno::Any SAL_CALL getDrawCommands(
                uno::Reference<io::XInputStream> const & xSvgStream,
                const OUString& aAbsolutePath) override;

            // XServiceInfo
            virtual OUString SAL_CALL getImplementationName() override;
            virtual bool SAL_CALL supportsService(const OUString&) override;
            virtual cpo::uno::Sequence< OUString > SAL_CALL getSupportedServiceNames() override;
        };

        }

        XSvgParser::XSvgParser(
            uno::Reference< uno::XComponentContext > context):
            context_(std::move(context))
        {
        }

        bool XSvgParser::parseSvgXML(uno::Reference<io::XInputStream> const & xSVGStream, uno::Reference<xml::sax::XDocumentHandler> const & xSvgDocHdl)
        {
            try
            {
                // prepare ParserInputSource
                xml::sax::InputSource myInputSource;
                myInputSource.aInputStream = xSVGStream;

                // get parser
                uno::Reference< xml::sax::XParser > xParser(
                    xml::sax::Parser::create(context_));
                // fdo#60471 need to enable internal entities because
                // certain ... popular proprietary products write SVG files
                // that use entities to define XML namespaces.
                uno::Reference<lang::XInitialization> const xInit(xParser,
                        uno::UNO_QUERY_THROW);
                cpo::uno::Sequence<cpo::uno::Any> args{ cpo::uno::Any(u"DoSmeplease"_ustr) };
                xInit->initialize(args);

                // connect parser and filter
                xParser->setDocumentHandler(xSvgDocHdl);

                // finally, parse the stream to a hierarchy of
                // SVGGraphicPrimitive2D which will be embedded to the
                // primitive sequence. Their decompositions will in the
                // end create local low-level primitives, thus SVG will
                // be processable from all our processors
                xParser->parseStream(myInputSource);
            }
            catch(const uno::Exception&)
            {
                TOOLS_INFO_EXCEPTION( "svg", "Parse error");
                return false;
            }

            return true;
        }

        cpo::uno::Sequence< uno::Reference< ::graphic::XPrimitive2D > > XSvgParser::getDecomposition(
            const uno::Reference< ::io::XInputStream >& xSVGStream,
            const OUString& aAbsolutePath )
        {
            drawinglayer::primitive2d::Primitive2DContainer aRetval;

            if(xSVGStream.is())
            {
                // local document handler
                rtl::Reference<SvgDocHdl> pSvgDocHdl = new SvgDocHdl(aAbsolutePath);
                parseSvgXML(xSVGStream, pSvgDocHdl);

                // decompose to primitives
                for(std::unique_ptr<SvgNode> const & pCandidate : pSvgDocHdl->getSvgDocument().getSvgNodeVector())
                {
                    if (Display::None != pCandidate->getDisplay())
                    {
                        pCandidate->decomposeSvgNode(aRetval, false);
                    }
                }
            }
            else
            {
                OSL_ENSURE(false, "Invalid stream (!)");
            }

            return aRetval.toSequence();
        }

        cpo::uno::Any SAL_CALL XSvgParser::getDrawCommands(
                uno::Reference<io::XInputStream> const & xSvgStream,
                const OUString& aAbsolutePath)
        {
            cpo::uno::Any aAnyResult;

            if (!xSvgStream.is())
                return aAnyResult;

            rtl::Reference<SvgDocHdl> pSvgDocHdl = new SvgDocHdl(aAbsolutePath);
            parseSvgXML(xSvgStream, pSvgDocHdl);

            // decompose to primitives
            for (std::unique_ptr<SvgNode> const & pCandidate : pSvgDocHdl->getSvgDocument().getSvgNodeVector())
            {
                if (Display::None != pCandidate->getDisplay())
                {
                    mpVisitor = std::make_shared<SvgDrawVisitor>();
                    pCandidate->accept(*mpVisitor);
                    std::shared_ptr<gfx::DrawRoot> pDrawRoot(mpVisitor->getDrawRoot());
                    sal_uInt64 nPointer = reinterpret_cast<sal_uInt64>(pDrawRoot.get());
                    aAnyResult <<= sal_uInt64(nPointer);
                }
            }

            return aAnyResult;
        }

        OUString SAL_CALL XSvgParser::getImplementationName()
        {
            return u"svgio::svgreader::XSvgParser"_ustr;
        }

        bool SAL_CALL XSvgParser::supportsService(const OUString& rServiceName)
        {
            return cppu::supportsService(this, rServiceName);
        }

        cpo::uno::Sequence< OUString > SAL_CALL XSvgParser::getSupportedServiceNames()
        {
            return { u"com.sun.star.graphic.SvgTools"_ustr };
        }

} // end of namespace svgio::svgreader

extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*
svgio_XSvgParser_get_implementation(
    css::uno::XComponentContext* context, cpo::uno::Sequence<cpo::uno::Any> const&)
{
    return cppu::acquire(new svgio::svgreader::XSvgParser(context));
}

extern "C" bool TestImportSVG(SvStream& rStream)
{
    css::uno::Reference<css::io::XInputStream> xStream(new utl::OInputStreamWrapper(rStream));
    rtl::Reference<svgio::svgreader::XSvgParser> xSvgParser(new svgio::svgreader::XSvgParser(comphelper::getProcessComponentContext()));
    return xSvgParser->getDecomposition(xStream, OUString()).getLength() != 0;
}

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