/**************************************************************
 * 
 * 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
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_vcl.hxx"

#include "vcl/quickselectionengine.hxx"
#include "vcl/event.hxx"
#include "vcl/timer.hxx"
#include "vcl/i18nhelp.hxx"
#include "vcl/svapp.hxx"

#include <boost/optional.hpp>

//........................................................................
namespace vcl
{
//........................................................................

	//====================================================================
	//= QuickSelectionEngine_Data
	//====================================================================
    struct QuickSelectionEngine_Data
    {
        ISearchableStringList&              rEntryList;
        String                              sCurrentSearchString;
        ::boost::optional< sal_Unicode >    aSingleSearchChar;
        Timer                               aSearchTimeout;

        QuickSelectionEngine_Data( ISearchableStringList& _entryList )
            :rEntryList( _entryList )
            ,sCurrentSearchString()
            ,aSingleSearchChar()
            ,aSearchTimeout()
        {
	        aSearchTimeout.SetTimeout( 2500 );
	        aSearchTimeout.SetTimeoutHdl( LINK( this, QuickSelectionEngine_Data, SearchStringTimeout ) );
        }

        ~QuickSelectionEngine_Data()
        {
	        aSearchTimeout.Stop();
        }

	    DECL_LINK( SearchStringTimeout, Timer* );
    };

    //--------------------------------------------------------------------
    namespace
    {
        static void lcl_reset( QuickSelectionEngine_Data& _data )
        {
            _data.sCurrentSearchString.Erase();
            _data.aSingleSearchChar.reset();
            _data.aSearchTimeout.Stop();
        }
    }

	//--------------------------------------------------------------------
    IMPL_LINK( QuickSelectionEngine_Data, SearchStringTimeout, Timer*, /*EMPTYARG*/ )
    {
        lcl_reset( *this );
	    return 1;
    }

	//--------------------------------------------------------------------
    static StringEntryIdentifier findMatchingEntry( const String& _searchString, QuickSelectionEngine_Data& _engineData )
    {
        const vcl::I18nHelper& rI18nHelper = Application::GetSettings().GetLocaleI18nHelper();
            // TODO: do we really need the Window's settings here? The original code used it ...

        String sEntryText;
        // get the "current + 1" entry
        StringEntryIdentifier pSearchEntry = _engineData.rEntryList.CurrentEntry( sEntryText );
        if ( pSearchEntry )
            pSearchEntry = _engineData.rEntryList.NextEntry( pSearchEntry, sEntryText );
        // loop 'til we find another matching entry
        StringEntryIdentifier pStartedWith = pSearchEntry;
        while ( pSearchEntry )
        {
            if ( rI18nHelper.MatchString( _searchString, sEntryText ) != 0 )
                break;

            pSearchEntry = _engineData.rEntryList.NextEntry( pSearchEntry, sEntryText );
            if ( pSearchEntry == pStartedWith )
                pSearchEntry = NULL;
        }

        return pSearchEntry;
    }

    //====================================================================
	//= QuickSelectionEngine
	//====================================================================
	//--------------------------------------------------------------------
    QuickSelectionEngine::QuickSelectionEngine( ISearchableStringList& _entryList )
        :m_pData( new QuickSelectionEngine_Data( _entryList ) )
    {
    }

	//--------------------------------------------------------------------
    QuickSelectionEngine::~QuickSelectionEngine()
    {
    }

    //--------------------------------------------------------------------
    bool QuickSelectionEngine::HandleKeyEvent( const KeyEvent& _keyEvent )
    {
        xub_Unicode c = _keyEvent.GetCharCode();

        if ( ( c >= 32 ) && ( c != 127 ) && !_keyEvent.GetKeyCode().IsMod2() )
        {
            m_pData->sCurrentSearchString += c;
            OSL_TRACE( "QuickSelectionEngine::HandleKeyEvent: searching for %s", ByteString( m_pData->sCurrentSearchString, RTL_TEXTENCODING_UTF8 ).GetBuffer() );

            if ( m_pData->sCurrentSearchString.Len() == 1 )
            {   // first character in the search -> remmeber
                m_pData->aSingleSearchChar.reset( c );
            }
            else if ( m_pData->sCurrentSearchString.Len() > 1 )
            {
                if ( !!m_pData->aSingleSearchChar && ( *m_pData->aSingleSearchChar != c ) )
                    // we already have a "single char", but the current one is different -> reset
                    m_pData->aSingleSearchChar.reset();
            }

            XubString aSearchTemp( m_pData->sCurrentSearchString );

            StringEntryIdentifier pMatchingEntry = findMatchingEntry( aSearchTemp, *m_pData );
            OSL_TRACE( "QuickSelectionEngine::HandleKeyEvent: found %p", pMatchingEntry );
            if ( !pMatchingEntry && ( aSearchTemp.Len() > 1 ) && !!m_pData->aSingleSearchChar )
            {
                // if there's only one letter in the search string, use a different search mode
                aSearchTemp = *m_pData->aSingleSearchChar;
                pMatchingEntry = findMatchingEntry( aSearchTemp, *m_pData );
            }

            if ( pMatchingEntry )
            {
                m_pData->rEntryList.SelectEntry( pMatchingEntry );
                m_pData->aSearchTimeout.Start();
            }
            else
            {
                lcl_reset( *m_pData );
            }

            return true;
        }
        return false;
    }

    //--------------------------------------------------------------------
    void QuickSelectionEngine::Reset()
    {
        lcl_reset( *m_pData );
    }

//........................................................................
} // namespace vcl
//........................................................................