/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2006 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
 * Copyright (C) 2004-2011 KiCad Developers, see change_log.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 sheet.cpp
 */

#include <fctsys.h>
#include <class_drawpanel.h>
#include <confirm.h>
#include <wxEeschemaStruct.h>
#include <base_units.h>

#include <sch_sheet.h>

#include <dialogs/dialog_sch_sheet_props.h>
#include <wildcards_and_files_ext.h>
#include <project.h>


bool SCH_EDIT_FRAME::EditSheet( SCH_SHEET* aSheet, wxDC* aDC )
{
    if( aSheet == NULL )
        return false;

    // Get the new texts
    DIALOG_SCH_SHEET_PROPS dlg( this );

    wxString units = GetUnitsLabel( g_UserUnit );
    dlg.SetFileName( aSheet->GetFileName() );
    dlg.SetFileNameTextSize( StringFromValue( g_UserUnit, aSheet->GetFileNameSize() ) );
    dlg.SetFileNameTextSizeUnits( units );
    dlg.SetSheetName( aSheet->GetName() );
    dlg.SetSheetNameTextSize( StringFromValue( g_UserUnit, aSheet->GetSheetNameSize() ) );
    dlg.SetSheetNameTextSizeUnits( units );
    dlg.SetSheetTimeStamp( wxString::Format( wxT("%8.8lX"),
                           (unsigned long) aSheet->GetTimeStamp() ) );

    /* This ugly hack fixes a bug in wxWidgets 2.8.7 and likely earlier
     * versions for the flex grid sizer in wxGTK that prevents the last
     * column from being sized correctly.  It doesn't cause any problems
     * on win32 so it doesn't need to wrapped in ugly #ifdef __WXGTK__
     * #endif.
     */
    dlg.Layout();
    dlg.Fit();
    dlg.SetMinSize( dlg.GetSize() );

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

    wxFileName fileName = dlg.GetFileName();
    fileName.SetExt( SchematicFileExtension );

    if( !fileName.IsOk() )
    {
        DisplayError( this, _( "File name is not valid!" ) );

        if( m_canvas )
            m_canvas->Refresh();

        return false;
    }

    // Duplicate sheet names are not valid.
    const SCH_SHEET* sheet = GetScreen()->GetSheet( dlg.GetSheetName() );

    if( sheet && sheet != aSheet )
    {
        DisplayError( this, wxString::Format( _( "A sheet named \"%s\" already exists." ),
                                              GetChars( dlg.GetSheetName() ) ) );

        if( m_canvas )
            m_canvas->Refresh();

        return false;
    }

    wxString msg;
    wxString tmp;
    bool loadFromFile = false;
    SCH_SCREEN* useScreen = NULL;

    wxString newFilename = fileName.GetFullPath();

    // Search for a schematic file having the same filename
    // already in use in the hierarchy or on disk, in order to reuse it.
    if( !g_RootSheet->SearchHierarchy( newFilename, &useScreen ) )
    {
        // if user entered a relative path, allow that to stay, but do the
        // file existence test with an absolute (full) path.  This transformation
        // is local to this scope, but is the same one used at load time later.
        wxString absolute = Prj().AbsolutePath( newFilename );

        loadFromFile = wxFileExists( absolute );
    }

    // Inside Eeschema, filenames are stored using unix notation
    newFilename.Replace( wxT("\\"), wxT("/") );

    if( aSheet->GetScreen() == NULL )                          // New sheet.
    {
        if( useScreen || loadFromFile )            // Load from existing file.
        {
            if( useScreen != NULL )
            {
                msg.Printf( _( "A file named '%s' already exists in the current schematic hierarchy." ),
                            GetChars( newFilename ) );
            }
            else
            {
                msg.Printf( _( "A file named '%s' already exists." ),
                            GetChars( newFilename ) );
            }

            msg += _("\n\nDo you want to create a sheet with the contents of this file?" );

            if( !IsOK( this, msg ) )
            {
                if( m_canvas )
                    m_canvas->Refresh();

                return false;
            }
        }
        else                                                   // New file.
        {
            aSheet->SetScreen( new SCH_SCREEN( &Kiway() ) );
            aSheet->GetScreen()->SetFileName( newFilename );
        }
    }
    else                                                       // Existing sheet.
    {
        bool isUndoable = true;
        bool renameFile = false;

        // We are always using here a case insensitive comparison
        // to avoid issues under Windows, although under Unix
        // filenames are case sensitive.
        // But many users create schematic under both Unix and Windows
        if( newFilename.CmpNoCase( aSheet->GetFileName() ) != 0 )
        {
            // Sheet file name changes cannot be undone.
            isUndoable = false;
            msg = _( "Changing the sheet file name cannot be undone.  " );

            if( useScreen || loadFromFile )        // Load from existing file.
            {
                wxString tmp;
                if( useScreen != NULL )
                {
                    tmp.Printf( _( "A file named <%s> already exists in the current schematic hierarchy." ),
                                GetChars( newFilename ) );
                }
                else
                {
                    tmp.Printf( _( "A file named <%s> already exists." ),
                                GetChars( newFilename ) );
                }

                msg += tmp;
                msg += _("\n\nDo you want to replace the sheet with the contents of this file?" );

                if( !IsOK( this, msg ) )
                    return false;

                if( loadFromFile )
                    aSheet->SetScreen( NULL );
            }
            else                                               // Save to new file name.
            {
                if( aSheet->GetScreenCount() > 1 )
                {
                    msg += _( "This sheet uses shared data in a complex hierarchy.\n\n" );
                    msg += _( "Do you wish to convert it to a simple hierarchical sheet?" );

                    if( !IsOK( NULL, msg ) )
                        return false;
                }

                renameFile = true;
            }
        }

        aSheet->Draw( m_canvas, aDC, wxPoint( 0, 0 ), g_XorMode );
        m_canvas->SetIgnoreMouseEvents( true );

        if( isUndoable )
            SaveCopyInUndoList( aSheet, UR_CHANGED );

        if( renameFile )
        {
            aSheet->GetScreen()->SetFileName( newFilename );
            SaveEEFile( aSheet->GetScreen() );

            // If the the associated screen is shared by more than one sheet, remove the
            // screen and reload the file to a new screen.  Failure to do this will trash
            // the screen reference counting in complex hierarchies.
            if( aSheet->GetScreenCount() > 1 )
            {
                aSheet->SetScreen( NULL );
                loadFromFile = true;
            }
        }
    }

    aSheet->SetFileName( newFilename );

    if( useScreen )
        aSheet->SetScreen( useScreen );
    else if( loadFromFile )
        aSheet->Load( this );

    aSheet->SetFileNameSize( ValueFromString( g_UserUnit, dlg.GetFileNameTextSize() ) );
    aSheet->SetName( dlg.GetSheetName() );
    aSheet->SetSheetNameSize( ValueFromString( g_UserUnit, dlg.GetSheetNameTextSize() ) );

    if( aSheet->GetName().IsEmpty() )
        aSheet->SetName( wxString::Format( wxT( "Sheet%8.8lX" ), aSheet->GetTimeStamp() ) );

    m_canvas->MoveCursorToCrossHair();
    m_canvas->SetIgnoreMouseEvents( false );
    aSheet->Draw( m_canvas, aDC, wxPoint( 0, 0 ), GR_DEFAULT_DRAWMODE );
    OnModify();

    return true;
}


/* Move selected sheet with the cursor.
 * Callback function use by m_mouseCaptureCallback.
 */
static void MoveOrResizeSheet( EDA_DRAW_PANEL* aPanel, wxDC* aDC, const wxPoint& aPosition,
                               bool aErase )
{
    wxPoint        moveVector;
    BASE_SCREEN*   screen = aPanel->GetScreen();
    SCH_SHEET*     sheet = (SCH_SHEET*) screen->GetCurItem();

    if( aErase )
        sheet->Draw( aPanel, aDC, wxPoint( 0, 0 ), g_XorMode );

    wxPoint pos = sheet->GetPosition();

    if( sheet->IsResized() )
    {
        int width  = aPanel->GetParent()->GetCrossHairPosition().x - sheet->GetPosition().x;
        int height = aPanel->GetParent()->GetCrossHairPosition().y - sheet->GetPosition().y;

        // If the sheet doesn't have any pins, clamp the minimum size to the default values.
        width = ( width < MIN_SHEET_WIDTH ) ? MIN_SHEET_WIDTH : width;
        height = ( height < MIN_SHEET_HEIGHT ) ? MIN_SHEET_HEIGHT : height;

        if( sheet->HasPins() )
        {
            int gridSizeX = KiROUND( screen->GetGridSize().x );
            int gridSizeY = KiROUND( screen->GetGridSize().y );

            // If the sheet has pins, use the pin positions to clamp the minimum height.
            height = ( height < sheet->GetMinHeight() + gridSizeY ) ?
                     sheet->GetMinHeight() + gridSizeY : height;
            width = ( width < sheet->GetMinWidth() + gridSizeX ) ?
                    sheet->GetMinWidth() + gridSizeX : width;
        }

        wxPoint grid = aPanel->GetParent()->GetNearestGridPosition(
                        wxPoint( pos.x + width, pos.y + height ) );
        sheet->Resize( wxSize( grid.x - pos.x, grid.y - pos.y ) );
    }
    else if( sheet->IsMoving() )
    {
        moveVector = aPanel->GetParent()->GetCrossHairPosition() - pos;
        sheet->Move( moveVector );
    }

    sheet->Draw( aPanel, aDC, wxPoint( 0, 0 ), g_XorMode );
}


//  Complete sheet move.
static void ExitSheet( EDA_DRAW_PANEL* aPanel, wxDC* aDC )
{
    SCH_SCREEN* screen = (SCH_SCREEN*) aPanel->GetScreen();
    SCH_ITEM*   item = screen->GetCurItem();

    SCH_EDIT_FRAME* parent = (SCH_EDIT_FRAME*) aPanel->GetParent();

    if( (item == NULL) || (item->Type() != SCH_SHEET_T) || (parent == NULL) )
        return;

    parent->SetRepeatItem( NULL );

    item->Draw( aPanel, aDC, wxPoint( 0, 0 ), g_XorMode );

    if( item->IsNew() )
    {
        delete item;
    }
    else if( item->IsMoving() || item->IsResized() )
    {
        screen->Remove( item );
        delete item;

        item = parent->GetUndoItem();

        wxCHECK_RET( item != NULL, wxT( "Cannot restore undefined last sheet item." ) );

        screen->Append( item );
        // the owner of item is no more parent, this is the draw list of screen:
        parent->SetUndoItem( NULL );

        item->Draw( aPanel, aDC, wxPoint( 0, 0 ), GR_DEFAULT_DRAWMODE );
        item->ClearFlags();
    }
    else
    {
        item->ClearFlags();
    }

    screen->SetCurItem( NULL );
}


// Create hierarchy sheet.
SCH_SHEET* SCH_EDIT_FRAME::CreateSheet( wxDC* aDC )
{
    SetRepeatItem( NULL );

    SCH_SHEET* sheet = new SCH_SHEET( GetCrossHairPosition() );

    sheet->SetFlags( IS_NEW | IS_RESIZED );
    sheet->SetTimeStamp( GetNewTimeStamp() );
    sheet->SetParent( GetScreen() );
    sheet->SetScreen( NULL );

    // need to check if this is being added to the GetDrawItems().
    // also need to update the hierarchy, if we are adding
    // a sheet to a screen that already has multiple instances (!)
    GetScreen()->SetCurItem( sheet );
    m_canvas->SetMouseCapture( MoveOrResizeSheet, ExitSheet );
    m_canvas->CallMouseCapture( aDC, wxDefaultPosition, false );
    m_canvas->CrossHairOff( aDC );

    SetCrossHairPosition( sheet->GetResizePosition() );

    m_canvas->MoveCursorToCrossHair();
    m_canvas->CrossHairOn( aDC );

    return sheet;
}


void SCH_EDIT_FRAME::ReSizeSheet( SCH_SHEET* aSheet, wxDC* aDC )
{
    if( aSheet == NULL || aSheet->IsNew() )
        return;

    wxCHECK_RET( aSheet->Type() == SCH_SHEET_T,
                 wxString::Format( wxT( "Cannot perform sheet resize on %s object." ),
                                   GetChars( aSheet->GetClass() ) ) );

    m_canvas->CrossHairOff( aDC );
    SetCrossHairPosition( aSheet->GetResizePosition() );
    m_canvas->MoveCursorToCrossHair();
    m_canvas->CrossHairOn( aDC );

    SetUndoItem( aSheet );
    aSheet->SetFlags( IS_RESIZED );

    m_canvas->SetMouseCapture( MoveOrResizeSheet, ExitSheet );
    m_canvas->CallMouseCapture( aDC, wxDefaultPosition, true );

    if( aSheet->IsNew() )    // not already in edit, save a copy for undo/redo
        SetUndoItem( aSheet );
}


void SCH_EDIT_FRAME::StartMoveSheet( SCH_SHEET* aSheet, wxDC* aDC )
{
    if( ( aSheet == NULL ) || ( aSheet->Type() != SCH_SHEET_T ) )
        return;

    m_canvas->CrossHairOff( aDC );
    SetCrossHairPosition( aSheet->GetPosition() );
    m_canvas->MoveCursorToCrossHair();

    if( !aSheet->IsNew() )
        SetUndoItem( aSheet );

    aSheet->SetFlags( IS_MOVED );
    m_canvas->SetMouseCapture( MoveOrResizeSheet, ExitSheet );
    m_canvas->CallMouseCapture( aDC, wxDefaultPosition, true );
    m_canvas->CrossHairOn( aDC );
}