/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013 Jean-Pierre Charras, jp.charras at wanadoo.fr
 * Copyright (C) 2013 Wayne Stambaugh <stambaughw@gmail.com>
 * Copyright (C) 2013 CERN (www.cern.ch)
 * Copyright (C) 1992-2017 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 eeschema/files-io.cpp
 */

#include <fctsys.h>
#include <class_drawpanel.h>
#include <confirm.h>
#include <gestfich.h>
#include <schframe.h>
#include <pgm_base.h>
#include <kiface_i.h>
#include <richio.h>

#include <eeschema_id.h>
#include <class_library.h>
#include <libeditframe.h>
#include <sch_sheet.h>
#include <sch_sheet_path.h>
#include <sch_component.h>
#include <wildcards_and_files_ext.h>
#include <project_rescue.h>
#include <eeschema_config.h>
#include <sch_legacy_plugin.h>
#include <sch_eagle_plugin.h>
#include <symbol_lib_table.h>
#include <dialog_symbol_remap.h>


bool SCH_EDIT_FRAME::SaveEEFile( SCH_SCREEN* aScreen, bool aSaveUnderNewName,
                                 bool aCreateBackupFile )
{
    wxString msg;
    wxFileName schematicFileName;
    bool success;

    if( aScreen == NULL )
        aScreen = GetScreen();

    // If no name exists in the window yet - save as new.
    if( aScreen->GetFileName().IsEmpty() )
        aSaveUnderNewName = true;

    // Construct the name of the file to be saved
    schematicFileName = Prj().AbsolutePath( aScreen->GetFileName() );

    if( aSaveUnderNewName )
    {
        wxFileDialog dlg( this, _( "Schematic Files" ),
                          wxPathOnly( Prj().GetProjectFullName() ),
                          schematicFileName.GetFullName(), SchematicFileWildcard(),
                          wxFD_SAVE | wxFD_OVERWRITE_PROMPT );

        if( dlg.ShowModal() == wxID_CANCEL )
            return false;

        schematicFileName = dlg.GetPath();

        if( schematicFileName.GetExt() != SchematicFileExtension )
            schematicFileName.SetExt( SchematicFileExtension );
    }

    if( !IsWritable( schematicFileName ) )
        return false;

    // Create backup if requested
    if( aCreateBackupFile && schematicFileName.FileExists() )
    {
        wxFileName backupFileName = schematicFileName;

        // Rename the old file to a '.bak' one:
        backupFileName.SetExt( SchematicBackupFileExtension );

        if( backupFileName.FileExists() )
            wxRemoveFile( backupFileName.GetFullPath() );

        if( !wxRenameFile( schematicFileName.GetFullPath(), backupFileName.GetFullPath() ) )
        {
            msg.Printf( _( "Could not save backup of file '%s'" ),
                        GetChars( schematicFileName.GetFullPath() ) );
            DisplayError( this, msg );
        }
    }

    // Save
    wxLogTrace( traceAutoSave,
                wxT( "Saving file <" ) + schematicFileName.GetFullPath() + wxT( ">" ) );

    SCH_PLUGIN::SCH_PLUGIN_RELEASER pi( SCH_IO_MGR::FindPlugin( SCH_IO_MGR::SCH_LEGACY ) );

    try
    {
        pi->Save( schematicFileName.GetFullPath(), aScreen, &Kiway() );
        success = true;
    }
    catch( const IO_ERROR& ioe )
    {
        msg.Printf( _( "Error saving schematic file '%s'.\n%s" ),
                    GetChars( schematicFileName.GetFullPath() ), GetChars( ioe.What() ) );
        DisplayError( this, msg );

        msg.Printf( _( "Failed to save '%s'" ), GetChars( schematicFileName.GetFullPath() ) );
        AppendMsgPanel( wxEmptyString, msg, CYAN );

        success = false;
    }

    if( success )
    {
        // Delete auto save file.
        wxFileName autoSaveFileName = schematicFileName;
        autoSaveFileName.SetName( AUTOSAVE_PREFIX_FILENAME + schematicFileName.GetName() );

        if( autoSaveFileName.FileExists() )
        {
            wxLogTrace( traceAutoSave,
                        wxT( "Removing auto save file <" ) + autoSaveFileName.GetFullPath() +
                        wxT( ">" ) );

            wxRemoveFile( autoSaveFileName.GetFullPath() );
        }

        // Update the screen and frame info.
        if( aSaveUnderNewName )
            aScreen->SetFileName( schematicFileName.GetFullPath() );

        aScreen->ClrSave();
        aScreen->ClrModify();

        msg.Printf( _( "File %s saved" ), GetChars( aScreen->GetFileName() ) );
        SetStatusText( msg, 0 );
    }
    else
    {
        DisplayError( this, _( "File write operation failed." ) );
    }

    return success;
}


void SCH_EDIT_FRAME::Save_File( wxCommandEvent& event )
{
    int id = event.GetId();

    switch( id )
    {
    case ID_UPDATE_ONE_SHEET:
        SaveEEFile( NULL );
        break;

    case ID_SAVE_ONE_SHEET_UNDER_NEW_NAME:
        if( SaveEEFile( NULL, true ) )
        {
            CreateArchiveLibraryCacheFile( true );
        }
        break;
    }

    UpdateTitle();
}


bool SCH_EDIT_FRAME::OpenProjectFiles( const std::vector<wxString>& aFileSet, int aCtl )
{
    // implement the pseudo code from KIWAY_PLAYER.h:

    // This is for python:
    if( aFileSet.size() != 1 )
    {
        UTF8 msg = StrPrintf( "Eeschema:%s() takes only a single filename.", __func__ );
        DisplayError( this, msg );
        return false;
    }

    wxString    fullFileName( aFileSet[0] );

    // We insist on caller sending us an absolute path, if it does not, we say it's a bug.
    wxASSERT_MSG( wxFileName( fullFileName ).IsAbsolute(),
        wxT( "bug in single_top.cpp or project manager." ) );

    if( !LockFile( fullFileName ) )
    {
        wxString msg = wxString::Format( _(
                "Schematic file '%s' is already open." ),
                GetChars( fullFileName )
                );
        DisplayError( this, msg );
        return false;
    }

    if( !AskToSaveChanges() )
        return false;

    wxFileName pro = fullFileName;
    pro.SetExt( ProjectFileExtension );

    bool is_new = !wxFileName::IsFileReadable( fullFileName );

    // If its a non-existent schematic and caller thinks it exists
    if( is_new && !( aCtl & KICTL_CREATE ) )
    {
        // notify user that fullFileName does not exist, ask if user wants to create it.
        wxString ask = wxString::Format( _(
                "Schematic '%s' does not exist.  Do you wish to create it?" ),
                GetChars( fullFileName )
                );
        if( !IsOK( this, ask ) )
            return false;
    }

    // unload current project file before loading new
    {
        delete g_RootSheet;
        g_RootSheet = NULL;

        CreateScreens();
    }

    GetScreen()->SetFileName( fullFileName );
    g_RootSheet->SetFileName( fullFileName );

    SetStatusText( wxEmptyString );
    ClearMsgPanel();

    LoadProjectFile();

    // PROJECT::SetProjectFullName() is an impactful function.  It should only be
    // called under carefully considered circumstances.

    // The calling code should know not to ask me here to change projects unless
    // it knows what consequences that will have on other KIFACEs running and using
    // this same PROJECT.  It can be very harmful if that calling code is stupid.

    // Don't reload the symbol libraries if we are just launching Eeschema from KiCad again.
    // They are already saved in the kiface project object.
    if( pro.GetFullPath() != Prj().GetProjectFullName()
      || !Prj().GetElem( PROJECT::ELEM_SCH_PART_LIBS ) )
    {
        Prj().SetProjectFullName( pro.GetFullPath() );

        // load the libraries here, not in SCH_SCREEN::Draw() which is a context
        // that will not tolerate DisplayError() dialog since we're already in an
        // event handler in there.
        // And when a schematic file is loaded, we need these libs to initialize
        // some parameters (links to PART LIB, dangling ends ...)
        Prj().SetElem( PROJECT::ELEM_SCH_PART_LIBS, NULL );
        Prj().SchLibs();
    }

    // Load the symbol library table, this will be used forever more.
    Prj().SetElem( PROJECT::ELEM_SYMBOL_LIB_TABLE, NULL );
    Prj().SchSymbolLibTable();

    if( is_new )
    {
        // mark new, unsaved file as modified.
        GetScreen()->SetModify();
    }
    else
    {
        delete g_RootSheet;   // Delete the current project.
        g_RootSheet = NULL;   // Force CreateScreens() to build new empty project on load failure.
        SCH_PLUGIN::SCH_PLUGIN_RELEASER pi( SCH_IO_MGR::FindPlugin( SCH_IO_MGR::SCH_LEGACY ) );

        try
        {
            g_RootSheet = pi->Load( fullFileName, &Kiway() );
            m_CurrentSheet->clear();
            m_CurrentSheet->push_back( g_RootSheet );
        }
        catch( const IO_ERROR& ioe )
        {
            // Do not leave g_RootSheet == NULL because it is expected to be
            // a valid sheet. Therefore create a dummy empty root sheet and screen.
            CreateScreens();
            Zoom_Automatique( false );

            wxString msg;
            msg.Printf( _( "Error loading schematic file '%s'.\n%s" ),
                        GetChars( fullFileName ), GetChars( ioe.What() ) );
            DisplayError( this, msg );

            msg.Printf( _( "Failed to load '%s'" ), GetChars( fullFileName ) );
            AppendMsgPanel( wxEmptyString, msg, CYAN );

            return false;
        }

        SetScreen( m_CurrentSheet->LastScreen() );

        // It's possible the schematic parser fixed errors due to bugs so warn the user
        // that the schematic has been fixed (modified).
        SCH_SHEET_LIST sheetList( g_RootSheet );

        if( sheetList.IsModified() )
        {
            DisplayInfoMessage( this,
                                _( "An error was found when loading the schematic that has "
                                   "been automatically fixed.  Please save the schematic to "
                                   "repair the broken file or it may not be usable with other "
                                   "versions of KiCad." ) );
        }

        UpdateFileHistory( fullFileName );

        SCH_SCREENS schematic;

        // Convert old projects over to use symbol library table.
        if( schematic.HasNoFullyDefinedLibIds() )
        {
            // Ignore the never show rescue setting for one last rescue of legacy symbol
            // libraries before remapping to the symbol library table.  This ensures the
            // best remapping results.
            RescueLegacyProject( false );

            DIALOG_SYMBOL_REMAP dlgRemap( this );

            dlgRemap.ShowQuasiModal();
        }
        else
        {
            // Check to see whether some old library parts need to be rescued
            // Only do this if RescueNeverShow was not set.
            wxConfigBase *config = Kiface().KifaceSettings();
            bool rescueNeverShow = false;
            config->Read( RescueNeverShowEntry, &rescueNeverShow, false );

            if( !rescueNeverShow )
                RescueSymbolLibTableProject( false );
        }

        schematic.UpdateSymbolLinks();      // Update all symbol library links for all sheets.
        GetScreen()->TestDanglingEnds();    // Only perform the dangling end test on root sheet.
    }

    GetScreen()->SetGrid( ID_POPUP_GRID_LEVEL_1000 + m_LastGridSizeId );
    Zoom_Automatique( false );
    SetSheetNumberAndCount();
    m_canvas->Refresh( true );

    return true;
}


bool SCH_EDIT_FRAME::AppendSchematic()
{
    wxString    msg;
    wxString    fullFileName;

    SCH_SCREEN* screen = GetScreen();

    if( !screen )
    {
        wxLogError( wxT( "Document not ready, cannot import" ) );
        return false;
    }

    // open file chooser dialog
    wxString path = wxPathOnly( Prj().GetProjectFullName() );

    wxFileDialog dlg( this, _( "Append Schematic" ), path,
                      wxEmptyString, SchematicFileWildcard(),
                      wxFD_OPEN | wxFD_FILE_MUST_EXIST );

    if( dlg.ShowModal() == wxID_CANCEL )
        return false;

    fullFileName = dlg.GetPath();

    wxFileName fn = fullFileName;

    if( fn.IsRelative() )
    {
        fn.MakeAbsolute();
        fullFileName = fn.GetFullPath();
    }

    wxString cache_name = PART_LIBS::CacheName( fullFileName );

    if( !!cache_name )
    {
        PART_LIBS*  libs = Prj().SchLibs();

        try
        {
            if( PART_LIB* lib = libs->AddLibrary( cache_name ) )
                lib->SetCache();
        }
        catch( const IO_ERROR& ioe )
        {
            DisplayError( this, ioe.What() );
        }
    }

    wxLogDebug( wxT( "Importing schematic " ) + fullFileName );

    // Load the schematic into a temporary sheet.
    SCH_PLUGIN::SCH_PLUGIN_RELEASER pi( SCH_IO_MGR::FindPlugin( SCH_IO_MGR::SCH_LEGACY ) );
    std::unique_ptr< SCH_SHEET> newSheet( new SCH_SHEET );

    newSheet->SetFileName( fullFileName );

    try
    {
        pi->Load( fullFileName, &Kiway(), newSheet.get() );
    }
    catch( const IO_ERROR& ioe )
    {
        msg.Printf( _( "Error occurred loading schematic file '%s'." ), fullFileName );
        DisplayErrorMessage( this, msg, ioe.What() );

        msg.Printf( _( "Failed to load schematic '%s'" ), fullFileName );
        AppendMsgPanel( wxEmptyString, msg, CYAN );

        return false;
    }

    // Make sure any new sheet changes do not cause any recursion issues.
    SCH_SHEET_LIST hierarchy( g_RootSheet );          // This is the schematic sheet hierarchy.
    SCH_SHEET_LIST sheetHierarchy( newSheet.get() );  // This is the hierarchy of the import.

    wxFileName destFile = screen->GetFileName();

    if( destFile.IsRelative() )
        destFile.MakeAbsolute( Prj().GetProjectPath() );

    if( hierarchy.TestForRecursion( sheetHierarchy, destFile.GetFullPath( wxPATH_UNIX ) ) )
    {
        msg.Printf( _( "The sheet changes cannot be made because the destination sheet already "
                       "has the sheet <%s> or one of it's subsheets as a parent somewhere in "
                       "the schematic hierarchy." ),
                    destFile.GetFullPath() );
        DisplayError( this, msg );
        return false;
    }

    wxArrayString names;

    // Make sure the imported schematic has been remapped to the symbol library table.
    SCH_SCREENS newScreens( newSheet.get() );         // All screens associated with the import.

    if( newScreens.HasNoFullyDefinedLibIds() )
    {
        if( !IsOK( this,
                   "This schematic has not been remapped to the symbol library table. "
                   "Therefore, all of the library symbol links will be broken.  Do you "
                   "want to continue?" ) )
            return false;
    }
    else
    {
        // If there are symbol libraries in the imported schematic that are not in the
        // symbol library table of this project, there could be a lot of broken symbol
        // library links.  Attempt to add the missing libraries to the project symbol
        // library table.
        newScreens.GetLibNicknames( names );
        wxArrayString newLibNames;

        for( auto name : names )
        {
            if( !Prj().SchSymbolLibTable()->HasLibrary( name ) )
                newLibNames.Add( name );
        }

        wxFileName symLibTableFn( fn.GetPath(), SYMBOL_LIB_TABLE::GetSymbolLibTableFileName() );

        if( !newLibNames.IsEmpty() && symLibTableFn.Exists() && symLibTableFn.IsFileReadable() )
        {
            SYMBOL_LIB_TABLE table;

            try
            {
                table.Load( symLibTableFn.GetFullPath() );
            }
            catch( const IO_ERROR& ioe )
            {
                msg.Printf( _( "An error occurred loading the symbol library table '%s'." ),
                            symLibTableFn.GetFullPath() );
                DisplayErrorMessage( NULL, msg, ioe.What() );
            }

            if( !table.IsEmpty() )
            {
                for( auto libName : newLibNames )
                {
                    if( !table.HasLibrary( libName ) )
                        continue;

                    // Don't expand environment variable because KIPRJMOD will not be correct
                    // for a different project.
                    wxString uri = table.GetFullURI( libName, false );

                    wxFileName newLib;

                    if( uri.Contains( "${KIPRJMOD}" ) )
                    {
                        newLib.SetPath( fn.GetPath() );
                        newLib.SetFullName( uri.AfterLast( '}' ) );
                        uri = newLib.GetFullPath();
                    }
                    else
                    {
                        uri = table.GetFullURI( libName );
                    }

                    // Add the library from the imported project to the current project
                    // symbol library table.
                    const SYMBOL_LIB_TABLE_ROW* row = table.FindRow( libName );

                    wxCHECK2_MSG( row, continue, "Library '" + libName +
                                  "' missing from symbol library table '" +
                                  symLibTableFn.GetFullPath() + "'." );

                    wxString newLibName = libName;
                    int libNameCnt = 1;

                    // Rename the imported symbol library if it already exists.
                    while( Prj().SchSymbolLibTable()->HasLibrary( newLibName ) )
                    {
                        newLibName = wxString::Format( "%s%d", libName, libNameCnt );
                    }

                    SYMBOL_LIB_TABLE_ROW* newRow = new SYMBOL_LIB_TABLE_ROW( newLibName,
                                                                             uri,
                                                                             row->GetType(),
                                                                             row->GetOptions(),
                                                                             row->GetDescr() );
                    Prj().SchSymbolLibTable()->InsertRow( newRow );

                    if( libName != newLibName )
                        newScreens.ChangeSymbolLibNickname( libName, newLibName );
                }
            }
        }
    }

    // Check for duplicate sheet names in the current page.
    wxArrayString duplicateSheetNames;
    SCH_TYPE_COLLECTOR sheets;

    sheets.Collect( screen->GetDrawItems(), SCH_COLLECTOR::SheetsOnly );

    for( int i = 0;  i < sheets.GetCount();  ++i )
    {
        if( newSheet->GetScreen()->GetSheet( ( ( SCH_SHEET* ) sheets[i] )->GetName() ) )
            duplicateSheetNames.Add( ( ( SCH_SHEET* ) sheets[i] )->GetName() );
    }

    if( !duplicateSheetNames.IsEmpty() )
    {
        msg.Printf( "Duplicate sheet names exist on the current page.  Do you want to "
                    "automatically rename the duplicate sheet names?" );
        if( !IsOK( this, msg ) )
            return false;
    }

    SCH_SCREEN* newScreen = newSheet->GetScreen();
    wxCHECK_MSG( newScreen, false, "No screen defined for imported sheet." );

    for( auto duplicateName : duplicateSheetNames )
    {
        SCH_SHEET* renamedSheet = newScreen->GetSheet( duplicateName );

        wxCHECK2_MSG( renamedSheet, continue,
                      "Sheet " + duplicateName + " not found in imported schematic." );

        time_t newtimestamp = GetNewTimeStamp();
        renamedSheet->SetTimeStamp( newtimestamp );
        renamedSheet->SetName( wxString::Format( "Sheet%8.8lX", (long) newtimestamp ) );
    }

    // Clear all annotation in the imported schematic to prevent clashes with existing annotation.
    newScreens.ClearAnnotation();

    // It is finally save to add the imported schematic.
    screen->Append( newScreen );

    SCH_SCREENS allScreens;
    allScreens.ReplaceDuplicateTimeStamps();

    OnModify();

    // redraw base screen (ROOT) if necessary
    SCH_SCREENS screens( GetCurrentSheet().Last() );

    screens.UpdateSymbolLinks( true );
    GetScreen()->SetGrid( ID_POPUP_GRID_LEVEL_1000 + m_LastGridSizeId );
    Zoom_Automatique( false );
    SetSheetNumberAndCount();
    m_canvas->Refresh( true );
    return true;
}


void SCH_EDIT_FRAME::OnAppendProject( wxCommandEvent& event )
{
    if( GetScreen() && GetScreen()->IsModified() )
    {
        wxString msg = _( "This operation cannot be undone.\n\n"
                          "Do you want to save the current document before proceeding?" );

        if( IsOK( this, msg ) )
            OnSaveProject( event );
    }

    AppendSchematic();
}


void SCH_EDIT_FRAME::OnImportProject( wxCommandEvent& aEvent )
{
    if( !AskToSaveChanges() )
        return;

    wxString path = wxPathOnly( Prj().GetProjectFullName() );

    wxFileDialog dlg( this, _( "Import Schematic" ), path,
                      wxEmptyString, EagleSchematicFileWildcard(),
                      wxFD_OPEN | wxFD_FILE_MUST_EXIST );

    if( dlg.ShowModal() == wxID_CANCEL )
        return;

    // For now there is only one import plugin
    ImportFile( dlg.GetPath(), SCH_IO_MGR::SCH_EAGLE );
}


void SCH_EDIT_FRAME::OnSaveProject( wxCommandEvent& aEvent )
{
    SCH_SCREEN* screen;
    SCH_SCREENS screenList;

    // I want to see it in the debugger, show me the string!  Can't do that with wxFileName.
    wxString    fileName = Prj().AbsolutePath( g_RootSheet->GetFileName() );

    wxFileName  fn = fileName;

    if( !fn.IsDirWritable() )
    {
        wxString msg = wxString::Format( _( "Directory '%s' is not writable." ), fn.GetPath() );

        DisplayError( this, msg );
        return;
    }

    for( screen = screenList.GetFirst(); screen; screen = screenList.GetNext() )
        SaveEEFile( screen );

    CreateArchiveLibraryCacheFile();

    UpdateTitle();
}


bool SCH_EDIT_FRAME::doAutoSave()
{
    wxFileName  tmpFileName = g_RootSheet->GetFileName();
    wxFileName  fn = tmpFileName;
    wxFileName  tmp;
    SCH_SCREENS screens;

    bool autoSaveOk = true;

    tmp.AssignDir( fn.GetPath() );

    if( !tmp.IsOk() )
        return false;

    if( !IsWritable( tmp ) )
        return false;

    for( SCH_SCREEN* screen = screens.GetFirst(); screen; screen = screens.GetNext() )
    {
        // Only create auto save files for the schematics that have been modified.
        if( !screen->IsSave() )
            continue;

        tmpFileName = fn = screen->GetFileName();

        // Auto save file name is the normal file name prefixed with AUTOSAVE_PREFIX_FILENAME.
        fn.SetName( AUTOSAVE_PREFIX_FILENAME + fn.GetName() );

        screen->SetFileName( fn.GetFullPath() );

        if( SaveEEFile( screen, false, NO_BACKUP_FILE ) )
            screen->SetModify();
        else
            autoSaveOk = false;

        screen->SetFileName( tmpFileName.GetFullPath() );
    }

    if( autoSaveOk )
        m_autoSaveState = false;

    return autoSaveOk;
}


bool SCH_EDIT_FRAME::ImportFile( const wxString& aFileName, int aFileType )
{
    wxString fullFileName( aFileName );

    SCH_PLUGIN::SCH_PLUGIN_RELEASER pi;
    wxString projectpath;
    wxFileName newfilename;
    SCH_SHEET_LIST sheetList( g_RootSheet );
    SCH_SCREENS schematic;

    switch( (SCH_IO_MGR::SCH_FILE_T) aFileType )
    {
        case SCH_IO_MGR::SCH_EAGLE:
            // We insist on caller sending us an absolute path, if it does not, we say it's a bug.
            wxASSERT_MSG( wxFileName( fullFileName ).IsAbsolute(),
                    wxT( "Import eagle schematic caller didn't send full filename" ) );

            if( !LockFile( fullFileName ) )
            {
                wxString msg = wxString::Format( _( "Schematic file '%s' is already open." ),
                        GetChars( fullFileName ) );
                DisplayError( this, msg );
                return false;
            }

            try
            {
                pi.set( SCH_IO_MGR::FindPlugin( SCH_IO_MGR::SCH_EAGLE ) );
                g_RootSheet = pi->Load( fullFileName, &Kiway() );

                projectpath = Kiway().Prj().GetProjectPath();
                newfilename = Prj().AbsolutePath( Prj().GetProjectName() );
                newfilename.SetExt( SchematicFileExtension );

                m_CurrentSheet->clear();
                m_CurrentSheet->push_back( g_RootSheet );
                SetScreen( m_CurrentSheet->LastScreen() );

                g_RootSheet->SetFileName( newfilename.GetFullPath() );
                GetScreen()->SetFileName( newfilename.GetFullPath() );
                GetScreen()->SetModify();

                UpdateFileHistory( fullFileName );
                schematic.UpdateSymbolLinks();      // Update all symbol library links for all sheets.
                GetScreen()->TestDanglingEnds();    // Only perform the dangling end test on root sheet.

                GetScreen()->SetGrid( ID_POPUP_GRID_LEVEL_1000 + m_LastGridSizeId );
                Zoom_Automatique( false );
                SetSheetNumberAndCount();
                m_canvas->Refresh( true );
                UpdateTitle();
            }
            catch( const IO_ERROR& ioe )
            {
                // Do not leave g_RootSheet == NULL because it is expected to be
                // a valid sheet. Therefore create a dummy empty root sheet and screen.
                CreateScreens();
                Zoom_Automatique( false );

                wxString msg;
                msg.Printf( _( "Error loading schematic file '%s'.\n%s" ),
                            fullFileName, ioe.What() );
                DisplayError( this, msg );

                msg.Printf( _( "Failed to load '%s'" ), fullFileName );
                AppendMsgPanel( wxEmptyString, msg, CYAN );

                return false;
            }

            return true;

        default:
            return false;
    }

    return false;
}


bool SCH_EDIT_FRAME::AskToSaveChanges()
{
    SCH_SCREENS screenList;

    // Save any currently open and modified project files.
    for( SCH_SCREEN* screen = screenList.GetFirst(); screen; screen = screenList.GetNext() )
    {
        if( screen->IsModify() )
        {
            int response = YesNoCancelDialog( m_parent, _(
                "The current schematic has been modified.  Do you wish to save the changes?" ),
                wxEmptyString,
                _( "Save and Load" ),
                _( "Load Without Saving" )
                );

            if( response == wxID_CANCEL )
            {
                return false;
            }
            else if( response == wxID_YES )
            {
                wxCommandEvent dummy;
                OnSaveProject( dummy );
            }
            // else wxID_NO, so do not save

            break;
        }
    }

    return true;
}