/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2011 Jean-Pierre Charras, <jp.charras@wanadoo.fr>
 * Copyright (C) 2013 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
 * Copyright (C) 1992-2013 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

/**
 * @file footprint_info.cpp
 */


#define USE_WORKER_THREADS      1       // 1:yes, 0:no. use worker thread to load libraries

/*
 * Functions to read footprint libraries and fill m_footprints by available footprints names
 * and their documentation (comments and keywords)
 */

#include <fctsys.h>
#include <common.h>
#include <macros.h>
#include <pgm_base.h>
#include <wildcards_and_files_ext.h>
#include <footprint_info.h>
#include <io_mgr.h>
#include <fp_lib_table.h>
#include <fpid.h>
#include <class_module.h>
#include <boost/thread.hpp>


/*
static wxString ToHTMLFragment( const IO_ERROR* aDerivative )
{
    @todo

    1)  change up IO_ERROR so it keeps linenumbers, source file name and
        error message in separate strings.

    2)  Add a summarizing virtual member like
            virtual wxString What()
        to combine all portions of an IO_ERROR's text into a single wxString.

    3)  Do same for PARSE_ERROR.

    4)  Add a "reason or error category" to IO_ERROR and thereby also PARSE_ERROR?

    msg += "

    for( int i=0; i<aCount; ++i )
    {


        wxArrayString* sl = wxStringSplit( aList, wxChar( '\n' ) );


        delete sl;
    }

    wxString msg = wxT( "<ul>" );

    for ( unsigned ii = 0; ii < strings_list->GetCount(); ii++ )
    {
        msg += wxT( "<li>" );
        msg += strings_list->Item( ii ) + wxT( "</li>" );
    }

    msg += wxT( "</ul>" );

    m_htmlWindow->AppendToPage( msg );

    delete strings_list;
}
*/


void FOOTPRINT_INFO::load()
{
    FP_LIB_TABLE*   fptable = m_owner->GetTable();

    wxASSERT( fptable );

    std::auto_ptr<MODULE> m( fptable->FootprintLoad( m_nickname, m_fpname ) );

    m_pad_count = m->GetPadCount( MODULE::DO_NOT_INCLUDE_NPTH );
    m_keywords  = m->GetKeywords();
    m_doc       = m->GetDescription();

    // tell ensure_loaded() I'm loaded.
    m_loaded = true;
}


#define JOBZ                6       // no. libraries per worker thread.  It takes about
                                    // a second to load a GITHUB library, so assigning
                                    // this no. libraries to each thread should give a little
                                    // over this no. seconds total time if the original delay
                                    // were caused by latencies alone.
                                    // (If https://github.com does not mind.)

#define NTOLERABLE_ERRORS   4       // max errors before aborting, although threads
                                    // in progress will still pile on for a bit.  e.g. if 9 threads
                                    // expect 9 greater than this.

void FOOTPRINT_LIST::loader_job( const wxString* aNicknameList, int aJobZ )
{
    //DBG(printf( "%s: first:'%s' count:%d\n", __func__, (char*) TO_UTF8( *aNicknameList ), aJobZ );)

    for( int i=0; i<aJobZ; ++i )
    {
        if( m_error_count >= NTOLERABLE_ERRORS )
            break;

        const wxString& nickname = aNicknameList[i];

        try
        {
            wxArrayString fpnames = m_lib_table->FootprintEnumerate( nickname );

            for( unsigned ni=0;  ni<fpnames.GetCount();  ++ni )
            {
                FOOTPRINT_INFO* fpinfo = new FOOTPRINT_INFO( this, nickname, fpnames[ni] );

                addItem( fpinfo );
            }
        }
        catch( const PARSE_ERROR& pe )
        {
            // m_errors.push_back is not thread safe, lock its MUTEX.
            MUTLOCK lock( m_errors_lock );

            ++m_error_count;        // modify only under lock
            m_errors.push_back( new IO_ERROR( pe ) );
        }
        catch( const IO_ERROR& ioe )
        {
            MUTLOCK lock( m_errors_lock );

            ++m_error_count;
            m_errors.push_back( new IO_ERROR( ioe ) );
        }

        // Catch anything unexpected and map it into the expected.
        // Likely even more important since this function runs on GUI-less
        // worker threads.
        catch( const std::exception& se )
        {
            // This is a round about way to do this, but who knows what THROW_IO_ERROR()
            // may be tricked out to do someday, keep it in the game.
            try
            {
                THROW_IO_ERROR( se.what() );
            }
            catch( const IO_ERROR& ioe )
            {
                MUTLOCK lock( m_errors_lock );

                ++m_error_count;
                m_errors.push_back( new IO_ERROR( ioe ) );
            }
        }
    }
}


bool FOOTPRINT_LIST::ReadFootprintFiles( FP_LIB_TABLE* aTable, const wxString* aNickname )
{
    bool retv = true;

    m_lib_table = aTable;

    // Clear data before reading files
    m_error_count = 0;
    m_errors.clear();
    m_list.clear();

    if( aNickname )
        // single footprint
        loader_job( aNickname, 1 );
    else
    {
        std::vector< wxString > nicknames;

        // do all of them
        nicknames = aTable->GetLogicalLibs();

#if USE_WORKER_THREADS

        // Even though the PLUGIN API implementation is the place for the
        // locale toggling, in order to keep LOCAL_IO::C_count at 1 or greater
        // for the duration of all helper threads, we increment by one here via instantiation.
        // Only done here because of the multi-threaded nature of this code.
        // Without this C_count skips in and out of "equal to zero" and causes
        // needless locale toggling among the threads, based on which of them
        // are in a PLUGIN::FootprintLoad() function.  And that is occasionally
        // none of them.
        LOCALE_IO   top_most_nesting;

        // Something which will not invoke a thread copy constructor, one of many ways obviously:
        typedef boost::ptr_vector< boost::thread >  MYTHREADS;

        MYTHREADS threads;

        // Give each thread JOBZ nicknames to process.  The last portion of, or if the entire
        // size() is small, I'll do myself.
        for( unsigned i=0; i<nicknames.size();  )
        {
            if( m_error_count >= NTOLERABLE_ERRORS )
            {
                // abort the remaining nicknames.
                retv = false;
                break;
            }

            int jobz = JOBZ;

            if( i + jobz >= nicknames.size() )
            {
                jobz = nicknames.size() - i;

                // Only a little bit to do, I'll do it myself, on current thread.
                loader_job( &nicknames[i], jobz );
            }
            else
            {
                // Delegate the job to a worker thread created here.
                threads.push_back( new boost::thread( &FOOTPRINT_LIST::loader_job,
                        this, &nicknames[i], jobz ) );
            }

            i += jobz;
        }

        // Wait for all the worker threads to complete, it does not matter in what order
        // we wait for them as long as a full sweep is made.  Think of the great race,
        // everyone must finish.
        for( unsigned i=0;  i<threads.size();  ++i )
        {
            threads[i].join();
        }
#else
        loader_job( &nicknames[0], nicknames.size() );
#endif

        m_list.sort();
    }

    // The result of this function can be a blend of successes and failures, whose
    // mix is given by the Count()s of the two lists.  The return value indicates whether
    // an abort occurred, even true does not necessarily mean full success, although
    // false definitely means failure.

    return retv;
}


FOOTPRINT_INFO* FOOTPRINT_LIST::GetModuleInfo( const wxString& aFootprintName )
{
    BOOST_FOREACH( FOOTPRINT_INFO& fp, m_list )
    {
        FPID fpid;

        wxCHECK_MSG( fpid.Parse( aFootprintName ) < 0, NULL,
                     wxString::Format( wxT( "'%s' is not a valid FPID." ),
                                       GetChars( aFootprintName ) ) );

        wxString libNickname   = fpid.GetLibNickname();
        wxString footprintName = fpid.GetFootprintName();

        if( libNickname == fp.GetNickname() && footprintName == fp.GetFootprintName() )
            return &fp;
    }

    return NULL;
}


bool FOOTPRINT_INFO::InLibrary( const wxString& aLibrary ) const
{
    return aLibrary == m_nickname;
}


#include <confirm.h>    // until scaffolding goes.

void FOOTPRINT_LIST::DisplayErrors( wxTopLevelWindow* aWindow )
{
#if 1
    // scaffolding until a better one is written, hopefully below.

    DBG(printf( "m_error_count:%d\n", m_error_count );)

    wxString msg = _( "Errors were encountered loading footprints" );

    msg += wxT( '\n' );

    for( unsigned i = 0; i<m_errors.size();  ++i )
    {
        msg += m_errors[i].errorText;
        msg += wxT( '\n' );
    }

    DisplayError( aWindow, msg );

#else   // real evolving deal:

    // @todo: go to a more HTML !<table>! ? centric output, possibly with
    // recommendations for remedy of errors.  Add numeric error codes
    // to PARSE_ERROR, and switch on them for remedies, etc.  Full
    // access is provided to everything in every exception!

    HTML_MESSAGE_BOX dlg( aWindow, _( "Load Error" ) );

    dlg.MessageSet( _( "Errors were encountered loading footprints" ) );

    wxString msg = my html wizardry.

    dlg.AddHTML_Text( msg );

    dlg.ShowModal();

#endif
}