/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2014-2016 CERN
 * Copyright (C) 2020 KiCad Developers, see AUTHORS.txt for contributors.
 * @author Maciej Suminski <maciej.suminski@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 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
 */

#include <base_screen.h>
#include <base_units.h>
#include <bitmaps.h>
#include <class_draw_panel_gal.h>
#include <dialog_configure_paths.h>
#include <eda_draw_frame.h>
#include <gal/graphics_abstraction_layer.h>
#include <id.h>
#include <kiface_i.h>
#include <project.h>
#include <settings/app_settings.h>
#include <tool/actions.h>
#include <tool/common_tools.h>
#include <tool/tool_manager.h>
#include <view/view.h>
#include <view/view_controls.h>


COMMON_TOOLS::COMMON_TOOLS() :
    TOOL_INTERACTIVE( "common.Control" ),
    m_frame( nullptr ),
    m_imperialUnit( EDA_UNITS::INCHES ),
    m_metricUnit( EDA_UNITS::MILLIMETRES )
{
}

void COMMON_TOOLS::Reset( RESET_REASON aReason )
{
    m_frame = getEditFrame<EDA_DRAW_FRAME>();

    GRID_SETTINGS& settings = m_toolMgr->GetSettings()->m_Window.grid;

    m_grids.clear();

    for( const wxString& gridDef : settings.sizes )
    {
        int gridSize = (int) ValueFromString( EDA_UNITS::MILLIMETRES, gridDef );
        m_grids.emplace_back( gridSize, gridSize );
    }

    m_grids.emplace_back( ValueFromString( EDA_UNITS::MILLIMETRES, settings.user_grid_x ),
                          ValueFromString( EDA_UNITS::MILLIMETRES, settings.user_grid_y ) );

    OnGridChanged();
}


void COMMON_TOOLS::SetLastUnits( EDA_UNITS aUnit )
{
    if( IsImperialUnit( aUnit ) )
        m_imperialUnit = aUnit;
    else if( IsMetricUnit( aUnit ) )
        m_metricUnit = aUnit;
    else
        wxASSERT_MSG( false, "Invalid unit" );
}


int COMMON_TOOLS::SelectionTool( const TOOL_EVENT& aEvent )
{
    // Since selection tools are run permanently underneath the toolStack, this is really
    // just a cancel of whatever other tools might be running.

    m_toolMgr->ProcessEvent( TOOL_EVENT( TC_COMMAND, TA_CANCEL_TOOL ) );
    return 0;
}


// Cursor control
int COMMON_TOOLS::CursorControl( const TOOL_EVENT& aEvent )
{
    long type = aEvent.Parameter<intptr_t>();
    bool fastMove = type & ACTIONS::CURSOR_FAST_MOVE;
    type &= ~ACTIONS::CURSOR_FAST_MOVE;
    bool mirroredX = getView()->IsMirroredX();

    VECTOR2D cursor = getViewControls()->GetRawCursorPosition( false );
    VECTOR2D gridSize = getView()->GetGAL()->GetGridSize();

    if( fastMove )
        gridSize = gridSize * 10;

    switch( type )
    {
    case ACTIONS::CURSOR_UP:
        cursor -= VECTOR2D( 0, gridSize.y );
        break;

    case ACTIONS::CURSOR_DOWN:
        cursor += VECTOR2D( 0, gridSize.y );
        break;

    case ACTIONS::CURSOR_LEFT:
        cursor -= VECTOR2D( mirroredX ? -gridSize.x : gridSize.x, 0 );
        break;

    case ACTIONS::CURSOR_RIGHT:
        cursor += VECTOR2D( mirroredX ? -gridSize.x : gridSize.x, 0 );
        break;

    case ACTIONS::CURSOR_CLICK:              // fall through
    case ACTIONS::CURSOR_DBL_CLICK:
    case ACTIONS::CURSOR_RIGHT_CLICK:
    {
        TOOL_ACTIONS action = TA_MOUSE_CLICK;
        TOOL_MOUSE_BUTTONS button = BUT_LEFT;
        int modifiers = 0;

        modifiers |= wxGetKeyState( WXK_SHIFT ) ? MD_SHIFT : 0;
        modifiers |= wxGetKeyState( WXK_CONTROL ) ? MD_CTRL : 0;
        modifiers |= wxGetKeyState( WXK_ALT ) ? MD_ALT : 0;

        if( type == ACTIONS::CURSOR_DBL_CLICK )
            action = TA_MOUSE_DBLCLICK;

        if( type == ACTIONS::CURSOR_RIGHT_CLICK )
            button = BUT_RIGHT;

        TOOL_EVENT evt( TC_MOUSE, action, button | modifiers );
        evt.SetMousePosition( getViewControls()->GetCursorPosition() );
        m_toolMgr->ProcessEvent( evt );

        return 0;
    }
    default:
        wxFAIL_MSG( "CursorControl(): unexpected request" );
    }

    getViewControls()->SetCursorPosition( cursor, true, true, type );
    m_toolMgr->RunAction( ACTIONS::refreshPreview );

    return 0;
}


int COMMON_TOOLS::PanControl( const TOOL_EVENT& aEvent )
{
    long type = aEvent.Parameter<intptr_t>();
    KIGFX::VIEW* view = getView();
    VECTOR2D center = view->GetCenter();
    VECTOR2D gridSize = getView()->GetGAL()->GetGridSize() * 10;
    bool mirroredX = view->IsMirroredX();

    switch( type )
    {
    case ACTIONS::CURSOR_UP:
        center -= VECTOR2D( 0, gridSize.y );
        break;

    case ACTIONS::CURSOR_DOWN:
        center += VECTOR2D( 0, gridSize.y );
        break;

    case ACTIONS::CURSOR_LEFT:
        center -= VECTOR2D( mirroredX ? -gridSize.x : gridSize.x, 0 );
        break;

    case ACTIONS::CURSOR_RIGHT:
        center += VECTOR2D( mirroredX ? -gridSize.x : gridSize.x, 0 );
        break;

    default:
        wxFAIL;
        break;
    }

    view->SetCenter( center );

    return 0;
}


int COMMON_TOOLS::ZoomRedraw( const TOOL_EVENT& aEvent )
{
    m_frame->HardRedraw();
    return 0;
}


int COMMON_TOOLS::ZoomInOut( const TOOL_EVENT& aEvent )
{
    bool direction = aEvent.IsAction( &ACTIONS::zoomIn );
    return doZoomInOut( direction, true );
}


int COMMON_TOOLS::ZoomInOutCenter( const TOOL_EVENT& aEvent )
{
    bool direction = aEvent.IsAction( &ACTIONS::zoomInCenter );
    return doZoomInOut( direction, false );
}


int COMMON_TOOLS::doZoomInOut( bool aDirection, bool aCenterOnCursor )
{
    double zoom = getView()->GetGAL()->GetZoomFactor() / ZOOM_COEFF;

    // Step must be AT LEAST 1.3
    if( aDirection )
        zoom *= 1.3;
    else
        zoom /= 1.3;

    // Now look for the next closest menu step
    std::vector<double>& zoomList = m_toolMgr->GetSettings()->m_Window.zoom_factors;
    int idx;

    if( aDirection )
    {
        for( idx = 0; idx < int( zoomList.size() ); ++idx )
        {
            if( zoomList[idx] >= zoom )
                break;
        }

        if( idx >= int( zoomList.size() ) )
            idx = (int) zoomList.size() - 1;        // if we ran off the end then peg to the end
    }
    else
    {
        for( idx = int( zoomList.size() ) - 1; idx >= 0; --idx )
        {
            if( zoomList[idx] <= zoom )
                break;
        }

        if( idx < 0 )
            idx = 0;        // if we ran off the end then peg to the end
    }

    return doZoomToPreset( idx + 1, aCenterOnCursor );
}


int COMMON_TOOLS::ZoomCenter( const TOOL_EVENT& aEvent )
{
    KIGFX::VIEW_CONTROLS* ctls = getViewControls();

    ctls->CenterOnCursor();

    return 0;
}


int COMMON_TOOLS::ZoomFitScreen( const TOOL_EVENT& aEvent )
{
    return doZoomFit( ZOOM_FIT_ALL );
}


int COMMON_TOOLS::ZoomFitObjects( const TOOL_EVENT& aEvent )
{
    return doZoomFit( ZOOM_FIT_OBJECTS );
}


int COMMON_TOOLS::doZoomFit( ZOOM_FIT_TYPE_T aFitType )
{
    KIGFX::VIEW*        view   = getView();
    EDA_DRAW_PANEL_GAL* canvas = m_frame->GetCanvas();
    EDA_DRAW_FRAME*     frame  = getEditFrame<EDA_DRAW_FRAME>();

    BOX2I    bBox = frame->GetDocumentExtents();
    BOX2I    defaultBox = canvas->GetDefaultViewBBox();

    view->SetScale( 1.0 );  // The best scale will be determined later, but this initial
                            // value ensures all view parameters are up to date (especially
                            // at init time)
    VECTOR2D screenSize = view->ToWorld( canvas->GetClientSize(), false );

    // Currently "Zoom to Objects" is only supported in Eeschema & Pcbnew.  Support for other
    // programs in the suite can be added as needed.

    if( aFitType == ZOOM_FIT_OBJECTS )
    {
        if( frame->IsType( FRAME_SCH ) || frame->IsType( FRAME_PCB_EDITOR ) )
        {
            bBox = m_frame->GetDocumentExtents( false );
        }
        else
            aFitType = ZOOM_FIT_ALL; // Just do a "Zoom to Fit" for unsupported editors
    }

    // If the screen is empty then use the default view bbox

    if( bBox.GetWidth() == 0 || bBox.GetHeight() == 0 )
        bBox = defaultBox;

    VECTOR2D vsize = bBox.GetSize();
    double scale = view->GetScale() / std::max( fabs( vsize.x / screenSize.x ),
                                                fabs( vsize.y / screenSize.y ) );

    // if the scale isn't finite (most likely due to an empty canvas)
    // simply just make sure we are centered and quit out of trying to zoom to fit
    if( !std::isfinite( scale ) )
    {
        view->SetCenter( VECTOR2D( 0, 0 ) );
        return 0;
    }

    // Reserve a 2% margin around bounding boxes.
    double margin_scale_factor = 1.02;

    switch( aFitType )
    {
    case ZOOM_FIT_ALL:
        // Leave a bigger margin for library editors & viewers

        if( frame->IsType( FRAME_FOOTPRINT_VIEWER ) || frame->IsType( FRAME_FOOTPRINT_VIEWER_MODAL )
                || frame->IsType( FRAME_SCH_VIEWER ) || frame->IsType( FRAME_SCH_VIEWER_MODAL ) )
        {
            margin_scale_factor = 1.4;
        }
        else if( frame->IsType( FRAME_SCH_LIB_EDITOR ) || frame->IsType( FRAME_FOOTPRINT_EDITOR ) )
        {
            margin_scale_factor = 2;
        }
        break;

    // Currently the same value as "ZOOM_FIT_ALL" but allows easy expansion/change in the future.
    case ZOOM_FIT_OBJECTS:
        margin_scale_factor = 1.02; // Reserve a 2% margin around bounding box.
        break;

    default:
        margin_scale_factor = 1.02;
    }

    view->SetScale( scale / margin_scale_factor );
    view->SetCenter( bBox.Centre() );

    return 0;
}


int COMMON_TOOLS::CenterContents( const TOOL_EVENT& aEvent )
{
    EDA_DRAW_PANEL_GAL* canvas = m_frame->GetCanvas();
    BOX2I bBox = getModel<EDA_ITEM>()->ViewBBox();

    if( bBox.GetWidth() == 0 || bBox.GetHeight() == 0 )
        bBox = canvas->GetDefaultViewBBox();

    getView()->SetCenter( bBox.Centre() );

    // Take scrollbars into account
    VECTOR2D scrollbarSize = VECTOR2D( canvas->GetSize() - canvas->GetClientSize() );
    VECTOR2D worldScrollbarSize = getView()->ToWorld( scrollbarSize, false );
    getView()->SetCenter( getView()->GetCenter() + worldScrollbarSize / 2.0 );

    return 0;
}


int COMMON_TOOLS::ZoomPreset( const TOOL_EVENT& aEvent )
{
    unsigned int idx = aEvent.Parameter<intptr_t>();
    return doZoomToPreset( (int) idx, false );
}


// Note: idx == 0 is Auto; idx == 1 is first entry in zoomList
int COMMON_TOOLS::doZoomToPreset( int idx, bool aCenterOnCursor )
{
    std::vector<double>& zoomList = m_toolMgr->GetSettings()->m_Window.zoom_factors;

    if( idx == 0 )      // Zoom Auto
    {
        TOOL_EVENT dummy;
        return ZoomFitScreen( dummy );
    }
    else
    {
        idx--;
    }

    double scale = zoomList[idx] * ZOOM_COEFF;

    if( aCenterOnCursor )
    {
        getView()->SetScale( scale, getViewControls()->GetCursorPosition() );

        if( getViewControls()->IsCursorWarpingEnabled() )
            getViewControls()->CenterOnCursor();
    }
    else
    {
        getView()->SetScale( scale );
    }

    return 0;
}


// Grid control
int COMMON_TOOLS::GridNext( const TOOL_EVENT& aEvent )
{
    int& currentGrid = m_toolMgr->GetSettings()->m_Window.grid.last_size_idx;

    if( currentGrid + 1 < int( m_grids.size() ) )
        currentGrid++;

    return OnGridChanged();
}


int COMMON_TOOLS::GridPrev( const TOOL_EVENT& aEvent )
{
    int& currentGrid = m_toolMgr->GetSettings()->m_Window.grid.last_size_idx;

    if( currentGrid > 0 )
        currentGrid--;

    return OnGridChanged();
}


int COMMON_TOOLS::GridPreset( const TOOL_EVENT& aEvent )
{
    return GridPreset( aEvent.Parameter<intptr_t>() );
}


int COMMON_TOOLS::GridPreset( int idx )
{
    int& currentGrid = m_toolMgr->GetSettings()->m_Window.grid.last_size_idx;

    currentGrid = std::max( 0, std::min( idx, (int) m_grids.size() - 1 ) );

    return OnGridChanged();
}


int COMMON_TOOLS::OnGridChanged()
{
    int& currentGrid = m_toolMgr->GetSettings()->m_Window.grid.last_size_idx;

    currentGrid = std::max( 0, std::min( currentGrid, static_cast<int>( m_grids.size() ) - 1 ) );

    // Update the combobox (if any)
    wxUpdateUIEvent dummy;
    m_frame->OnUpdateSelectGrid( dummy );

    // Update GAL canvas from screen
    getView()->GetGAL()->SetGridSize( m_grids[ currentGrid ] );
    getView()->GetGAL()->SetGridVisibility( m_toolMgr->GetSettings()->m_Window.grid.show );
    getView()->MarkTargetDirty( KIGFX::TARGET_NONCACHED );

    // Put cursor on new grid
    VECTOR2D gridCursor = getViewControls()->GetCursorPosition( true );
    getViewControls()->SetCrossHairCursorPosition( gridCursor, false );

    return 0;
}


int COMMON_TOOLS::GridFast1( const TOOL_EVENT& aEvent )
{
    return GridPreset( m_frame->config()->m_Window.grid.fast_grid_1 );
}


int COMMON_TOOLS::GridFast2( const TOOL_EVENT& aEvent )
{
    return GridPreset( m_frame->config()->m_Window.grid.fast_grid_2 );
}


int COMMON_TOOLS::ToggleGrid( const TOOL_EVENT& aEvent )
{
    m_frame->SetGridVisibility( !m_frame->IsGridVisible() );

    return 0;
}


int COMMON_TOOLS::GridProperties( const TOOL_EVENT& aEvent )
{
    wxCommandEvent cmd( wxEVT_COMMAND_MENU_SELECTED );

    cmd.SetId( ID_GRID_SETTINGS );
    m_frame->ProcessEvent( cmd );

    return 0;
}


int COMMON_TOOLS::SwitchUnits( const TOOL_EVENT& aEvent )
{
    EDA_UNITS newUnit = aEvent.Parameter<EDA_UNITS>();

    if( IsMetricUnit( newUnit ) )
        m_metricUnit = newUnit;
    else if( IsImperialUnit( newUnit ) )
        m_imperialUnit = newUnit;
    else
        wxASSERT_MSG( false, "Invalid unit for the frame" );

    m_frame->ChangeUserUnits( newUnit );
    return 0;
}


int COMMON_TOOLS::ToggleUnits( const TOOL_EVENT& aEvent )
{
    m_frame->ChangeUserUnits( IsImperialUnit( m_frame->GetUserUnits() ) ?
                                      m_metricUnit :
                                      m_imperialUnit );
    return 0;
}


int COMMON_TOOLS::TogglePolarCoords( const TOOL_EVENT& aEvent )
{
    m_frame->SetStatusText( wxEmptyString );
    m_frame->SetShowPolarCoords( !m_frame->GetShowPolarCoords() );
    m_frame->UpdateStatusBar();

    return 0;
}


int COMMON_TOOLS::ResetLocalCoords( const TOOL_EVENT& aEvent )
{
    auto vcSettings = m_toolMgr->GetCurrentToolVC();

    // Use either the active tool forced cursor position or the general settings
    if( vcSettings.m_forceCursorPosition )
        m_frame->GetScreen()->m_LocalOrigin = vcSettings.m_forcedPosition;
    else
        m_frame->GetScreen()->m_LocalOrigin = getViewControls()->GetCursorPosition();

    m_frame->UpdateStatusBar();

    return 0;
}


int COMMON_TOOLS::ToggleCursor( const TOOL_EVENT& aEvent )
{
    auto& galOpts = m_frame->GetGalDisplayOptions();

    galOpts.m_forceDisplayCursor = !galOpts.m_forceDisplayCursor;
    galOpts.NotifyChanged();

    return 0;
}


int COMMON_TOOLS::ToggleCursorStyle( const TOOL_EVENT& aEvent )
{
    KIGFX::GAL_DISPLAY_OPTIONS& galOpts = m_frame->GetGalDisplayOptions();

    galOpts.m_fullscreenCursor = !galOpts.m_fullscreenCursor;
    galOpts.NotifyChanged();

    return 0;
}


int COMMON_TOOLS::SwitchCanvas( const TOOL_EVENT& aEvent )
{
    if( aEvent.IsAction( &ACTIONS::acceleratedGraphics ) )
        m_frame->SwitchCanvas( EDA_DRAW_PANEL_GAL::GAL_TYPE_OPENGL );
#ifndef __WXMAC__
    else if( aEvent.IsAction( &ACTIONS::standardGraphics ) )
        m_frame->SwitchCanvas( EDA_DRAW_PANEL_GAL::GAL_TYPE_CAIRO );
#endif
    else
        wxFAIL_MSG( "Unknown canvas type" );

    return 0;
}


void COMMON_TOOLS::setTransitions()
{
    Go( &COMMON_TOOLS::SelectionTool,      ACTIONS::selectionTool.MakeEvent() );

    // Cursor control
    Go( &COMMON_TOOLS::CursorControl,      ACTIONS::cursorUp.MakeEvent() );
    Go( &COMMON_TOOLS::CursorControl,      ACTIONS::cursorDown.MakeEvent() );
    Go( &COMMON_TOOLS::CursorControl,      ACTIONS::cursorLeft.MakeEvent() );
    Go( &COMMON_TOOLS::CursorControl,      ACTIONS::cursorRight.MakeEvent() );
    Go( &COMMON_TOOLS::CursorControl,      ACTIONS::cursorUpFast.MakeEvent() );
    Go( &COMMON_TOOLS::CursorControl,      ACTIONS::cursorDownFast.MakeEvent() );
    Go( &COMMON_TOOLS::CursorControl,      ACTIONS::cursorLeftFast.MakeEvent() );
    Go( &COMMON_TOOLS::CursorControl,      ACTIONS::cursorRightFast.MakeEvent() );

    Go( &COMMON_TOOLS::CursorControl,      ACTIONS::cursorClick.MakeEvent() );
    Go( &COMMON_TOOLS::CursorControl,      ACTIONS::cursorDblClick.MakeEvent() );
    Go( &COMMON_TOOLS::CursorControl,      ACTIONS::showContextMenu.MakeEvent() );

    // Pan control
    Go( &COMMON_TOOLS::PanControl,         ACTIONS::panUp.MakeEvent() );
    Go( &COMMON_TOOLS::PanControl,         ACTIONS::panDown.MakeEvent() );
    Go( &COMMON_TOOLS::PanControl,         ACTIONS::panLeft.MakeEvent() );
    Go( &COMMON_TOOLS::PanControl,         ACTIONS::panRight.MakeEvent() );

    // Zoom control
    Go( &COMMON_TOOLS::ZoomRedraw,         ACTIONS::zoomRedraw.MakeEvent() );
    Go( &COMMON_TOOLS::ZoomInOut,          ACTIONS::zoomIn.MakeEvent() );
    Go( &COMMON_TOOLS::ZoomInOut,          ACTIONS::zoomOut.MakeEvent() );
    Go( &COMMON_TOOLS::ZoomInOutCenter,    ACTIONS::zoomInCenter.MakeEvent() );
    Go( &COMMON_TOOLS::ZoomInOutCenter,    ACTIONS::zoomOutCenter.MakeEvent() );
    Go( &COMMON_TOOLS::ZoomCenter,         ACTIONS::zoomCenter.MakeEvent() );
    Go( &COMMON_TOOLS::ZoomFitScreen,      ACTIONS::zoomFitScreen.MakeEvent() );
    Go( &COMMON_TOOLS::ZoomFitObjects,     ACTIONS::zoomFitObjects.MakeEvent() );
    Go( &COMMON_TOOLS::ZoomPreset,         ACTIONS::zoomPreset.MakeEvent() );
    Go( &COMMON_TOOLS::CenterContents,     ACTIONS::centerContents.MakeEvent() );

    // Grid control
    Go( &COMMON_TOOLS::GridNext,           ACTIONS::gridNext.MakeEvent() );
    Go( &COMMON_TOOLS::GridPrev,           ACTIONS::gridPrev.MakeEvent() );
    Go( &COMMON_TOOLS::GridPreset,         ACTIONS::gridPreset.MakeEvent() );
    Go( &COMMON_TOOLS::GridFast1,          ACTIONS::gridFast1.MakeEvent() );
    Go( &COMMON_TOOLS::GridFast2,          ACTIONS::gridFast2.MakeEvent() );
    Go( &COMMON_TOOLS::ToggleGrid,         ACTIONS::toggleGrid.MakeEvent() );
    Go( &COMMON_TOOLS::GridProperties,     ACTIONS::gridProperties.MakeEvent() );

    // Units and coordinates
    Go( &COMMON_TOOLS::SwitchUnits,        ACTIONS::inchesUnits.MakeEvent() );
    Go( &COMMON_TOOLS::SwitchUnits,        ACTIONS::milsUnits.MakeEvent() );
    Go( &COMMON_TOOLS::SwitchUnits,        ACTIONS::millimetersUnits.MakeEvent() );
    Go( &COMMON_TOOLS::ToggleUnits,        ACTIONS::toggleUnits.MakeEvent() );
    Go( &COMMON_TOOLS::TogglePolarCoords,  ACTIONS::togglePolarCoords.MakeEvent() );
    Go( &COMMON_TOOLS::ResetLocalCoords,   ACTIONS::resetLocalCoords.MakeEvent() );

    // Misc
    Go( &COMMON_TOOLS::ToggleCursor,       ACTIONS::toggleCursor.MakeEvent() );
    Go( &COMMON_TOOLS::ToggleCursorStyle,  ACTIONS::toggleCursorStyle.MakeEvent() );
    Go( &COMMON_TOOLS::SwitchCanvas,       ACTIONS::acceleratedGraphics.MakeEvent() );
    Go( &COMMON_TOOLS::SwitchCanvas,       ACTIONS::standardGraphics.MakeEvent() );
}