/*
 * KiRouter - a push-and-(sometimes-)shove PCB router
 *
 * Copyright (C) 2013  CERN
 * Author: Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include <wx/numdlg.h>

#include <boost/optional.hpp>
#include <functional>
using namespace std::placeholders;

#include "class_draw_panel_gal.h"
#include "class_board.h"

#include <wxPcbStruct.h>
#include <id.h>
#include <macros.h>
#include <pcbnew_id.h>
#include <view/view_controls.h>
#include <pcbcommon.h>
#include <pcb_painter.h>
#include <dialogs/dialog_pns_settings.h>
#include <dialogs/dialog_pns_diff_pair_dimensions.h>
#include <dialogs/dialog_track_via_size.h>
#include <base_units.h>
#include <hotkeys.h>
#include <confirm.h>

#include <tool/context_menu.h>
#include <tool/tool_manager.h>
#include <tool/tool_settings.h>
#include <tools/common_actions.h>
#include <tools/size_menu.h>
#include <tools/selection_tool.h>
#include <tools/edit_tool.h>

#include <ratsnest_data.h>

#include "router_tool.h"
#include "pns_segment.h"
#include "pns_router.h"
#include "trace.h"

using namespace KIGFX;
using boost::optional;

static TOOL_ACTION ACT_NewTrack( "pcbnew.InteractiveRouter.NewTrack", AS_CONTEXT,
    TOOL_ACTION::LegacyHotKey( HK_ADD_NEW_TRACK ),
    _( "New Track" ),  _( "Starts laying a new track." ), add_tracks_xpm );

static TOOL_ACTION ACT_EndTrack( "pcbnew.InteractiveRouter.EndTrack", AS_CONTEXT, WXK_END,
    _( "End Track" ),  _( "Stops laying the current track." ), checked_ok_xpm );

static TOOL_ACTION ACT_AutoEndRoute( "pcbnew.InteractiveRouter.AutoEndRoute", AS_CONTEXT, 'F',
    _( "Auto-end Track" ),  _( "Automagically finishes currently routed track." ) );

static TOOL_ACTION ACT_Drag( "pcbnew.InteractiveRouter.Drag", AS_CONTEXT,
    TOOL_ACTION::LegacyHotKey( HK_DRAG_TRACK_KEEP_SLOPE ),
    _( "Drag Track/Via" ), _( "Drags a track or a via." ), drag_track_segment_xpm );

static TOOL_ACTION ACT_PlaceThroughVia( "pcbnew.InteractiveRouter.PlaceVia",
    AS_CONTEXT, TOOL_ACTION::LegacyHotKey( HK_ADD_THROUGH_VIA ),
    _( "Place Through Via" ),
    _( "Adds a through-hole via at the end of currently routed track." ),
    via_xpm );

static TOOL_ACTION ACT_PlaceBlindVia( "pcbnew.InteractiveRouter.PlaceBlindVia",
    AS_CONTEXT, TOOL_ACTION::LegacyHotKey( HK_ADD_BLIND_BURIED_VIA ),
    _( "Place Blind/Buried Via" ),
    _( "Adds a blind or buried via at the end of currently routed track."),
    via_buried_xpm );

static TOOL_ACTION ACT_PlaceMicroVia( "pcbnew.InteractiveRouter.PlaceMicroVia",
    AS_CONTEXT, TOOL_ACTION::LegacyHotKey( HK_ADD_MICROVIA ),
    _( "Place Microvia" ), _( "Adds a microvia at the end of currently routed track." ),
    via_microvia_xpm );

static TOOL_ACTION ACT_CustomTrackWidth( "pcbnew.InteractiveRouter.CustomTrackViaSize",
    AS_CONTEXT, 'Q',
    _( "Custom Track/Via Size" ),
    _( "Shows a dialog for changing the track width and via size." ),
    width_track_xpm );

static TOOL_ACTION ACT_SwitchPosture( "pcbnew.InteractiveRouter.SwitchPosture", AS_CONTEXT,
    TOOL_ACTION::LegacyHotKey( HK_SWITCH_TRACK_POSTURE ),
    _( "Switch Track Posture" ),
    _( "Switches posture of the currently routed track." ),
    change_entry_orient_xpm );

static TOOL_ACTION ACT_SetDpDimensions( "pcbnew.InteractiveRouter.SetDpDimensions",
    AS_CONTEXT, 'P',
    _( "Differential Pair Dimensions..." ),
    _( "Sets the width and gap of the currently routed differential pair." ),
    ps_diff_pair_tune_length_xpm );


ROUTER_TOOL::ROUTER_TOOL() :
    PNS_TOOL_BASE( "pcbnew.InteractiveRouter" )
{
}


class CONTEXT_TRACK_WIDTH_MENU: public CONTEXT_TRACK_VIA_SIZE_MENU
{
public:
    CONTEXT_TRACK_WIDTH_MENU()
        : CONTEXT_TRACK_VIA_SIZE_MENU( true, true ), m_board( NULL )
    {
        SetMenuHandler( std::bind( &CONTEXT_TRACK_WIDTH_MENU::EventHandler, this, _1 ) );
    }

    void SetBoard( BOARD* aBoard )
    {
        m_board = aBoard;

        Append( ID_POPUP_PCB_SELECT_CUSTOM_WIDTH, _( "Custom size" ),
                wxEmptyString, wxITEM_CHECK );

        Append( ID_POPUP_PCB_SELECT_AUTO_WIDTH, _( "Use the starting track width" ),
                _( "Route using the width of the starting track." ), wxITEM_CHECK );

        Append( ID_POPUP_PCB_SELECT_USE_NETCLASS_VALUES, _( "Use net class values" ),
                _( "Use track and via sizes from the net class" ), wxITEM_CHECK );

        AppendSeparator();

        // Append the list of tracks & via sizes
        AppendSizes( aBoard );
    }

    OPT_TOOL_EVENT EventHandler( const wxMenuEvent& aEvent )
    {
#if ID_POPUP_PCB_SELECT_VIASIZE1 < ID_POPUP_PCB_SELECT_WIDTH1
#error You have changed event ids order, it breaks code. Check the source code for more details.
// Recognising type of event (track width/via size) is based on comparison if the event id is
// within a specific range. If ranges of event ids changes, then the following is not valid anymore.
#endif
        BOARD_DESIGN_SETTINGS &bds = m_board->GetDesignSettings();

        int id = aEvent.GetId();

        // Initial settings, to be modified below
        bds.m_UseConnectedTrackWidth = false;
        bds.UseCustomTrackViaSize( false );

        if( id == ID_POPUP_PCB_SELECT_CUSTOM_WIDTH )
        {
            bds.UseCustomTrackViaSize( true );
        }

        else if( id == ID_POPUP_PCB_SELECT_AUTO_WIDTH )
        {
            bds.m_UseConnectedTrackWidth = true;
        }

        else if( id == ID_POPUP_PCB_SELECT_USE_NETCLASS_VALUES )
        {
            bds.SetViaSizeIndex( 0 );
            bds.SetTrackWidthIndex( 0 );
        }

        else if( id >= ID_POPUP_PCB_SELECT_VIASIZE1 )     // via size has changed
        {
            assert( id < ID_POPUP_PCB_SELECT_WIDTH_END_RANGE );

            bds.SetViaSizeIndex( id - ID_POPUP_PCB_SELECT_VIASIZE1 );
        }

        else    // track width has changed
        {
            assert( id >= ID_POPUP_PCB_SELECT_WIDTH1 );
            assert( id < ID_POPUP_PCB_SELECT_VIASIZE );

            bds.SetTrackWidthIndex( id - ID_POPUP_PCB_SELECT_WIDTH1 );
        }

        return OPT_TOOL_EVENT( COMMON_ACTIONS::trackViaSizeChanged.MakeEvent() );
    }

private:
    BOARD* m_board;
};


class ROUTER_TOOL_MENU: public CONTEXT_MENU
{
public:
    ROUTER_TOOL_MENU( BOARD* aBoard, PNS_ROUTER_MODE aMode )
    {
        SetTitle( _( "Interactive Router" ) );
        Add( ACT_NewTrack );
        Add( ACT_EndTrack );
//        Add( ACT_AutoEndRoute );  // fixme: not implemented yet. Sorry.
        Add( ACT_Drag );
        Add( ACT_PlaceThroughVia );
        Add( ACT_PlaceBlindVia );
        Add( ACT_PlaceMicroVia );
        Add( ACT_SwitchPosture );

        AppendSeparator();

        m_widthMenu.SetBoard( aBoard );
        Add( &m_widthMenu, _( "Select Track/Via Width" ) );

        Add( ACT_CustomTrackWidth );

        if( aMode == PNS_MODE_ROUTE_DIFF_PAIR )
            Add( ACT_SetDpDimensions );

        AppendSeparator();
        Add( PNS_TOOL_BASE::ACT_RouterOptions );
    }

private:
    CONTEXT_TRACK_WIDTH_MENU m_widthMenu;
};


ROUTER_TOOL::~ROUTER_TOOL()
{
    m_savedSettings.Save( GetSettings() );
}

bool ROUTER_TOOL::Init()
{
    m_savedSettings.Load( GetSettings() );
    return true;
}


void ROUTER_TOOL::Reset( RESET_REASON aReason )
{
    PNS_TOOL_BASE::Reset( aReason );

    Go( &ROUTER_TOOL::RouteSingleTrace, COMMON_ACTIONS::routerActivateSingle.MakeEvent() );
    Go( &ROUTER_TOOL::RouteDiffPair, COMMON_ACTIONS::routerActivateDiffPair.MakeEvent() );
    Go( &ROUTER_TOOL::DpDimensionsDialog, COMMON_ACTIONS::routerActivateDpDimensionsDialog.MakeEvent() );
    Go( &ROUTER_TOOL::SettingsDialog, COMMON_ACTIONS::routerActivateSettingsDialog.MakeEvent() );
    Go( &ROUTER_TOOL::InlineDrag, COMMON_ACTIONS::routerInlineDrag.MakeEvent() );
}


int ROUTER_TOOL::getDefaultWidth( int aNetCode )
{
    int w, d1, d2;

    getNetclassDimensions( aNetCode, w, d1, d2 );

    return w;
}


void ROUTER_TOOL::getNetclassDimensions( int aNetCode, int& aWidth,
                                         int& aViaDiameter, int& aViaDrill )
{
    BOARD_DESIGN_SETTINGS &bds = m_board->GetDesignSettings();

    NETCLASSPTR netClass;
    NETINFO_ITEM* ni = m_board->FindNet( aNetCode );

    if( ni )
    {
        wxString netClassName = ni->GetClassName();
        netClass = bds.m_NetClasses.Find( netClassName );
    }

    if( !netClass )
        netClass = bds.GetDefault();

    aWidth = netClass->GetTrackWidth();
    aViaDiameter = netClass->GetViaDiameter();
    aViaDrill = netClass->GetViaDrill();
}


void ROUTER_TOOL::handleCommonEvents( const TOOL_EVENT& aEvent )
{
#ifdef DEBUG
    if( aEvent.IsKeyPressed() )
    {
        switch( aEvent.KeyCode() )
        {
        case '0':
            TRACEn( 2, "saving drag/route log...\n" );
            m_router->DumpLog();
            break;
        }
    }
    else
#endif
    if( aEvent.IsAction( &ACT_RouterOptions ) )
    {
        DIALOG_PNS_SETTINGS settingsDlg( m_frame, m_router->Settings() );

        if( settingsDlg.ShowModal() == wxID_OK )
        {
            // FIXME: do we need an explicit update?
        }
    }
    else if( aEvent.IsAction( &ACT_SetDpDimensions ) )
    {
        PNS_SIZES_SETTINGS sizes = m_router->Sizes();
        DIALOG_PNS_DIFF_PAIR_DIMENSIONS settingsDlg( m_frame, sizes );

        if( settingsDlg.ShowModal() )
        {
            m_router->UpdateSizes( sizes );
        }
    }
    else if( aEvent.IsAction( &ACT_CustomTrackWidth ) )
    {
        BOARD_DESIGN_SETTINGS& bds = m_board->GetDesignSettings();
        DIALOG_TRACK_VIA_SIZE sizeDlg( m_frame, bds );

        if( sizeDlg.ShowModal() )
        {
            bds.UseCustomTrackViaSize( true );
            m_toolMgr->RunAction( COMMON_ACTIONS::trackViaSizeChanged );
        }
    }

    else if( aEvent.IsAction( &COMMON_ACTIONS::trackViaSizeChanged ) )
    {

        PNS_SIZES_SETTINGS sizes( m_router->Sizes() );
        sizes.ImportCurrent( m_board->GetDesignSettings() );
        m_router->UpdateSizes( sizes );
    }
}


int ROUTER_TOOL::getStartLayer( const PNS_ITEM* aItem )
{
    int tl = getView()->GetTopLayer();

    if( m_startItem )
    {
        const PNS_LAYERSET& ls = m_startItem->Layers();

        if( ls.Overlaps( tl ) )
            return tl;
        else
            return ls.Start();
    }

    return tl;
}


void ROUTER_TOOL::switchLayerOnViaPlacement()
{
    int al = m_frame->GetActiveLayer();
    int cl = m_router->GetCurrentLayer();

    if( cl != al )
    {
        m_router->SwitchLayer( al );
    }

    optional<int> newLayer = m_router->Sizes().PairedLayer( cl );

    if( !newLayer )
        newLayer = m_router->Sizes().GetLayerTop();

    m_router->SwitchLayer( *newLayer );
    m_frame->SetActiveLayer( ToLAYER_ID( *newLayer ) );
}


bool ROUTER_TOOL::onViaCommand( TOOL_EVENT& aEvent, VIATYPE_T aType )
{
    BOARD_DESIGN_SETTINGS& bds = m_board->GetDesignSettings();

    const int layerCount = bds.GetCopperLayerCount();
    int currentLayer = m_router->GetCurrentLayer();
    LAYER_ID pairTop = m_frame->GetScreen()->m_Route_Layer_TOP;
    LAYER_ID pairBottom = m_frame->GetScreen()->m_Route_Layer_BOTTOM;

    PNS_SIZES_SETTINGS sizes = m_router->Sizes();

    // fixme: P&S supports more than one fixed layer pair. Update the dialog?
    sizes.ClearLayerPairs();

    if( !m_router->IsPlacingVia() )
    {
        // Cannot place microvias or blind vias if not allowed (obvious)
        if( ( aType == VIA_BLIND_BURIED ) && ( !bds.m_BlindBuriedViaAllowed ) )
        {
            DisplayError( m_frame, _( "Blind/buried vias have to be enabled in the design settings." ) );
            return false;
        }

        if( ( aType == VIA_MICROVIA ) && ( !bds.m_MicroViasAllowed ) )
        {
            DisplayError( m_frame, _( "Microvias have to be enabled in the design settings." ) );
            return false;
        }

        // Can only place through vias on 2-layer boards
        if( ( aType != VIA_THROUGH ) && ( layerCount <= 2 ) )
        {
            DisplayError( m_frame, _( "Only through vias are allowed on 2 layer boards." ) );
            return false;
        }

        // Can only place microvias if we're on an outer layer, or directly adjacent to one
        if( ( aType == VIA_MICROVIA ) && ( currentLayer > In1_Cu ) && ( currentLayer < layerCount - 2 ) )
        {
            DisplayError( m_frame, _( "Microvias can be placed only between the outer layers " \
                                      "(F.Cu/B.Cu) and the ones directly adjacent to them." ) );
            return false;
        }
    }

    // Convert blind/buried via to a through hole one, if it goes through all layers
    if( aType == VIA_BLIND_BURIED && ( ( currentLayer == B_Cu ) || ( currentLayer == F_Cu ) )
                                    && ( ( pairTop == B_Cu && pairBottom == F_Cu )
                                      || ( pairTop == F_Cu && pairBottom == B_Cu ) ) )
    {
        aType = VIA_THROUGH;
    }

    switch( aType )
    {
    case VIA_THROUGH:
        sizes.SetViaDiameter( bds.GetCurrentViaSize() );
        sizes.SetViaDrill( bds.GetCurrentViaDrill() );
        sizes.AddLayerPair( pairTop, pairBottom );
        break;

    case VIA_MICROVIA:
        sizes.SetViaDiameter( bds.GetCurrentMicroViaSize() );
        sizes.SetViaDrill( bds.GetCurrentMicroViaDrill() );

        if( currentLayer == F_Cu || currentLayer == In1_Cu )
            sizes.AddLayerPair( F_Cu, In1_Cu );
        else if( currentLayer == B_Cu || currentLayer == layerCount - 2 )
            sizes.AddLayerPair( B_Cu, layerCount - 2 );
        else
            wxASSERT( false );
        break;

    case VIA_BLIND_BURIED:
        sizes.SetViaDiameter( bds.GetCurrentViaSize() );
        sizes.SetViaDrill( bds.GetCurrentViaDrill() );

        if( currentLayer == pairTop || currentLayer == pairBottom )
            sizes.AddLayerPair( pairTop, pairBottom );
        else
            sizes.AddLayerPair( pairTop, currentLayer );
        break;

    default:
        wxASSERT( false );
        break;
    }

    sizes.SetViaType( aType );

    m_router->UpdateSizes( sizes );
    m_router->ToggleViaPlacement();

    updateEndItem( aEvent );

    m_router->Move( m_endSnapPoint, m_endItem );        // refresh

    return false;
}


bool ROUTER_TOOL::prepareInteractive()
{
    int routingLayer = getStartLayer( m_startItem );
    m_frame->SetActiveLayer( ToLAYER_ID( routingLayer ) );

    // fixme: switch on invisible layer

	// for some reason I don't understand, GetNetclass() may return null sometimes...
    if( m_startItem &&
        m_startItem->Net() >= 0 &&
        m_startItem->Parent() &&
        m_startItem->Parent()->GetNetClass() )
    {
        highlightNet( true, m_startItem->Net() );
        // Update track width and via size shown in main toolbar comboboxes
        m_frame->SetCurrentNetClass( m_startItem->Parent()->GetNetClass()->GetName() );
    }
    else
        m_frame->SetCurrentNetClass( NETCLASS::Default );

    m_ctls->ForceCursorPosition( false );
    m_ctls->SetAutoPan( true );

    PNS_SIZES_SETTINGS sizes( m_router->Sizes() );

    sizes.Init( m_board, m_startItem );
    sizes.AddLayerPair( m_frame->GetScreen()->m_Route_Layer_TOP,
                        m_frame->GetScreen()->m_Route_Layer_BOTTOM );
    m_router->UpdateSizes( sizes );

    if( !m_router->StartRouting( m_startSnapPoint, m_startItem, routingLayer ) )
    {
        DisplayError( m_frame, m_router->FailureReason() );
        highlightNet( false );
        return false;
    }

    m_endItem = NULL;
    m_endSnapPoint = m_startSnapPoint;

    return true;
}


bool ROUTER_TOOL::finishInteractive()
{
    m_router->StopRouting();

    // Save the recent changes in the undo buffer
    if( m_router->GetUndoBuffer().GetCount() > 0 )
    {
        m_frame->SaveCopyInUndoList( m_router->GetUndoBuffer(), UR_UNSPECIFIED );
        m_router->ClearUndoBuffer();
        m_frame->OnModify();
    }

    m_ctls->SetAutoPan( false );
    m_ctls->ForceCursorPosition( false );
    highlightNet( false );

    return true;
}


void ROUTER_TOOL::performRouting()
{
    if( !prepareInteractive() )
        return;

    while( OPT_TOOL_EVENT evt = Wait() )
    {
        if( evt->IsCancel() || evt->IsActivate() )
            break;
        else if( evt->IsMotion() )
        {
            m_router->SetOrthoMode( evt->Modifier( MD_CTRL ) );
            updateEndItem( *evt );
            m_router->Move( m_endSnapPoint, m_endItem );
        }
        else if( evt->IsClick( BUT_LEFT ) )
        {
            updateEndItem( *evt );
            bool needLayerSwitch = m_router->IsPlacingVia();

            if( m_router->FixRoute( m_endSnapPoint, m_endItem ) )
                break;

            if( needLayerSwitch )
                switchLayerOnViaPlacement();

            // Synchronize the indicated layer
            m_frame->SetActiveLayer( ToLAYER_ID( m_router->GetCurrentLayer() ) );
            updateEndItem( *evt );
            m_router->Move( m_endSnapPoint, m_endItem );
            m_startItem = NULL;
        }
        else if( evt->IsAction( &ACT_PlaceThroughVia ) )
        {
            onViaCommand( *evt, VIA_THROUGH );
        }
        else if( evt->IsAction( &ACT_PlaceBlindVia ) )
        {
            onViaCommand( *evt, VIA_BLIND_BURIED );
        }
        else if( evt->IsAction( &ACT_PlaceMicroVia ) )
        {
            onViaCommand( *evt, VIA_MICROVIA );
        }
        else if( evt->IsAction( &ACT_SwitchPosture ) )
        {
            m_router->FlipPosture();
            updateEndItem( *evt );
            m_router->Move( m_endSnapPoint, m_endItem );        // refresh
        }
        else if( evt->IsAction( &COMMON_ACTIONS::layerChanged ) )
        {
            m_router->SwitchLayer( m_frame->GetActiveLayer() );
            updateEndItem( *evt );
            m_router->Move( m_endSnapPoint, m_endItem );        // refresh
        }
        else if( evt->IsAction( &ACT_EndTrack ) )
        {
            bool still_routing = true;
            while( still_routing )
                still_routing = m_router->FixRoute( m_endSnapPoint, m_endItem );
            break;
        }

        handleCommonEvents( *evt );
    }

    finishInteractive();
}


int ROUTER_TOOL::DpDimensionsDialog( const TOOL_EVENT& aEvent )
{
    Activate();

    PNS_SIZES_SETTINGS sizes = m_router->Sizes();
    DIALOG_PNS_DIFF_PAIR_DIMENSIONS settingsDlg( m_frame, sizes );

    if( settingsDlg.ShowModal() )
    {
        m_router->UpdateSizes( sizes );
        m_savedSizes = sizes;
    }

    return 0;
}


int ROUTER_TOOL::SettingsDialog( const TOOL_EVENT& aEvent )
{
    Activate();

    DIALOG_PNS_SETTINGS settingsDlg( m_frame, m_router->Settings() );

    if( settingsDlg.ShowModal() )
    {
        m_savedSettings = m_router->Settings();
    }
    return 0;
}


int ROUTER_TOOL::RouteSingleTrace( const TOOL_EVENT& aEvent )
{
    m_frame->SetToolID( ID_TRACK_BUTT, wxCURSOR_PENCIL, _( "Route Track" ) );
    return mainLoop( PNS_MODE_ROUTE_SINGLE );
}


int ROUTER_TOOL::RouteDiffPair( const TOOL_EVENT& aEvent )
{
    m_frame->SetToolID( ID_TRACK_BUTT, wxCURSOR_PENCIL, _( "Router Differential Pair" ) );
    return mainLoop( PNS_MODE_ROUTE_DIFF_PAIR );
}


int ROUTER_TOOL::mainLoop( PNS_ROUTER_MODE aMode )
{
    PCB_EDIT_FRAME* frame = getEditFrame<PCB_EDIT_FRAME>();
    BOARD* board = getModel<BOARD>();

    // Deselect all items
    m_toolMgr->RunAction( COMMON_ACTIONS::selectionClear, true );

    Activate();

    m_router->SetMode( aMode );

    m_ctls->SetSnapping( true );
    m_ctls->ShowCursor( true );
    frame->UndoRedoBlock( true );

    m_startSnapPoint = getViewControls()->GetCursorPosition();

    std::unique_ptr<ROUTER_TOOL_MENU> ctxMenu( new ROUTER_TOOL_MENU( board, aMode ) );
    SetContextMenu( ctxMenu.get() );

    // Main loop: keep receiving events
    while( OPT_TOOL_EVENT evt = Wait() )
    {
        if( m_needsSync )
        {
            m_router->SyncWorld();
            m_router->SetView( getView() );
            m_needsSync = false;
        }

        if( evt->IsCancel() || evt->IsActivate() )
            break; // Finish
        else if( evt->IsMotion() )
            updateStartItem( *evt );
        else if( evt->IsClick( BUT_LEFT ) || evt->IsAction( &ACT_NewTrack ) )
        {
            updateStartItem( *evt );

            if( evt->Modifier( MD_CTRL ) )
                performDragging();
            else
                performRouting();
        }
        else if( evt->IsAction( &ACT_Drag ) )
        {
            updateStartItem( *evt );
            performDragging();
        }
        else if( evt->IsAction( &ACT_PlaceThroughVia ) )
        {
            m_toolMgr->RunAction( COMMON_ACTIONS::layerToggle, true );
        }

        handleCommonEvents( *evt );
    }

    frame->SetToolID( ID_NO_TOOL_SELECTED, wxCURSOR_DEFAULT, wxEmptyString );
    frame->UndoRedoBlock( false );

    // Store routing settings till the next invocation
    m_savedSettings = m_router->Settings();
    m_savedSizes = m_router->Sizes();

    // Disable the context menu before it is destroyed
    SetContextMenu( NULL, CMENU_OFF );

    return 0;
}


void ROUTER_TOOL::performDragging()
{
    PCB_EDIT_FRAME* frame = getEditFrame<PCB_EDIT_FRAME>();
    VIEW_CONTROLS* ctls = getViewControls();

    bool dragStarted = m_router->StartDragging( m_startSnapPoint, m_startItem );

    if( !dragStarted )
        return;

    if( m_startItem && m_startItem->Net() >= 0 )
        highlightNet( true, m_startItem->Net() );

    ctls->SetAutoPan( true );

    while( OPT_TOOL_EVENT evt = Wait() )
    {
        ctls->ForceCursorPosition( false );

       if( evt->IsCancel() || evt->IsActivate() )
            break;
        else if( evt->IsMotion() )
        {
            updateEndItem( *evt );
            m_router->Move( m_endSnapPoint, m_endItem );
        }
        else if( evt->IsClick( BUT_LEFT ) )
        {
            if( m_router->FixRoute( m_endSnapPoint, m_endItem ) )
                break;
        }

        handleCommonEvents( *evt );
    }

    if( m_router->RoutingInProgress() )
        m_router->StopRouting();

    // Save the recent changes in the undo buffer
    frame->SaveCopyInUndoList( m_router->GetUndoBuffer(), UR_UNSPECIFIED );
    m_router->ClearUndoBuffer();
    frame->OnModify();

    m_startItem = NULL;

    ctls->SetAutoPan( false );
    ctls->ForceCursorPosition( false );
    highlightNet( false );
}


int ROUTER_TOOL::InlineDrag( const TOOL_EVENT& aEvent )
{
    const BOARD_CONNECTED_ITEM *item = aEvent.Parameter<const BOARD_CONNECTED_ITEM*>();
    PCB_EDIT_FRAME* frame = getEditFrame<PCB_EDIT_FRAME>();
    VIEW_CONTROLS* ctls = getViewControls();

    m_toolMgr->RunAction( COMMON_ACTIONS::selectionClear, true );

    Activate();

    m_router->SyncWorld();
    m_router->SetView( getView() );

    m_startItem = m_router->GetWorld()->FindItemByParent( item );

    VECTOR2I p0 = ctls->GetCursorPosition();

    bool dragStarted = m_router->StartDragging( p0, m_startItem );

    if( !dragStarted )
        return 0;

    ctls->ForceCursorPosition( false );
    ctls->SetAutoPan( true );
    frame->UndoRedoBlock( true );

    bool saveUndoBuffer = true;

    while( OPT_TOOL_EVENT evt = Wait() )
    {
        p0 = ctls->GetCursorPosition();

        if( evt->IsCancel() )
        {
            saveUndoBuffer = false;
            break;
        }
        else if( evt->IsMotion() || evt->IsDrag( BUT_LEFT ) )
        {
            m_router->Move( p0, NULL );
        }
        else if( evt->IsMouseUp( BUT_LEFT ) || evt->IsClick( BUT_LEFT ) )
        {
            saveUndoBuffer = m_router->FixRoute( p0, NULL );
            break;
        }
    }

    if( m_router->RoutingInProgress() )
        m_router->StopRouting();

    if( saveUndoBuffer )
    {
        frame->SaveCopyInUndoList( m_router->GetUndoBuffer(), UR_UNSPECIFIED );
        m_router->ClearUndoBuffer();
        frame->OnModify();
    }

    ctls->SetAutoPan( false );
    ctls->ShowCursor( false );
    frame->UndoRedoBlock( false );

    return 0;
}