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#include <config_lgpl.h>
#include <string.h>
#include <ne_xml.h>
#include <memory>

#include "LinkSequence.hxx"

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


struct LinkSequenceParseContext
{
    std::unique_ptr<ucb::Link> pLink;
    bool hasSource;
    bool hasDestination;

    LinkSequenceParseContext()
    : hasSource( false ), hasDestination( false ) {}
};

#define STATE_TOP (1)

#define STATE_LINK (STATE_TOP)
#define STATE_DST  (STATE_TOP + 1)
#define STATE_SRC  (STATE_TOP + 2)


extern "C" {

static int LinkSequence_startelement_callback(
    void *,
    int parent,
    const char * /*nspace*/,
    const char *name,
    const char ** )
{
    if ( name != nullptr )
    {
        switch ( parent )
        {
            case NE_XML_STATEROOT:
                if ( strcmp( name, "link" ) == 0 )
                    return STATE_LINK;
                break;

            case STATE_LINK:
                if ( strcmp( name, "dst" ) == 0 )
                    return STATE_DST;
                else if ( strcmp( name, "src" ) == 0 )
                    return STATE_SRC;
                break;
        }
    }
    return NE_XML_DECLINE;
}


static int LinkSequence_chardata_callback(
    void *userdata,
    int state,
    const char *buf,
    size_t len )
{
    LinkSequenceParseContext * pCtx
                    = static_cast< LinkSequenceParseContext * >( userdata );
    if ( !pCtx->pLink )
        pCtx->pLink.reset( new ucb::Link );

    switch ( state )
    {
        case STATE_DST:
            pCtx->pLink->Destination
                = OUString( buf, len, RTL_TEXTENCODING_ASCII_US );
            pCtx->hasDestination = true;
            break;

        case STATE_SRC:
            pCtx->pLink->Source
                = OUString( buf, len, RTL_TEXTENCODING_ASCII_US );
            pCtx->hasSource = true;
            break;
    }
    return 0; // zero to continue, non-zero to abort parsing
}


static int LinkSequence_endelement_callback(
    void *userdata,
    int state,
    const char *,
    const char * )
{
    LinkSequenceParseContext * pCtx
                    = static_cast< LinkSequenceParseContext * >( userdata );
    if ( !pCtx->pLink )
        pCtx->pLink.reset( new ucb::Link );

    switch ( state )
    {
        case STATE_LINK:
            if ( !pCtx->hasDestination || !pCtx->hasSource )
                return 1; // abort
            break;
    }
    return 0; // zero to continue, non-zero to abort parsing
}

}

// static
bool LinkSequence::createFromXML( const OString & rInData,
                                  uno::Sequence< ucb::Link > & rOutData )
{
    const sal_Int32 TOKEN_LENGTH = 7; // </link>
    bool success = true;

    // rInData may contain multiple <link>...</link> tags.
    sal_Int32 nCount = 0;
    sal_Int32 nStart = 0;
    sal_Int32 nEnd   = rInData.indexOf( "</link>" );
    while ( nEnd > -1 )
    {
        ne_xml_parser * parser = ne_xml_create();
        if ( !parser )
        {
            success = false;
            break;
        }

        LinkSequenceParseContext aCtx;
        ne_xml_push_handler( parser,
                             LinkSequence_startelement_callback,
                             LinkSequence_chardata_callback,
                             LinkSequence_endelement_callback,
                             &aCtx );

        ne_xml_parse( parser,
                      rInData.getStr() + nStart,
                      nEnd - nStart + TOKEN_LENGTH );

        success = !ne_xml_failed( parser );

        ne_xml_destroy( parser );

        if ( !success )
            break;

        if ( aCtx.pLink )
        {
            nCount++;
            if ( nCount > rOutData.getLength() )
                rOutData.realloc( rOutData.getLength() + 1 );

            rOutData[ nCount - 1 ] = *aCtx.pLink;
        }

        nStart = nEnd + TOKEN_LENGTH;
        nEnd   = rInData.indexOf( "</link>", nStart );
    }

    return success;
}


// static
bool LinkSequence::toXML( const uno::Sequence< ucb::Link > & rInData,
                          OUString & rOutData )
{
    // <link><src>value</src><dst>value</dst></link><link><src>....

    sal_Int32 nCount = rInData.getLength();
    if ( nCount )
    {
        for ( sal_Int32 n = 0; n < nCount; ++n )
        {
                rOutData += "<link><src>";
                rOutData += rInData[ n ].Source;
                rOutData += "</src><dst>";
                rOutData += rInData[ n ].Destination;
                rOutData += "</dst></link>";
        }
        return true;
    }
    return false;
}

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