

#include "tools/tool.h"

// TnzTools includes
#include "tools/toolcommandids.h"
#include "tools/toolhandle.h"
#include "tools/cursors.h"
#include "tools/tooloptions.h"
#include "tools/toolutils.h"

// TnzQt includes
#include "toonzqt/icongenerator.h"

// TnzLib includes
#include "toonzqt/menubarcommand.h"
#include "toonz/txshsimplelevel.h"
#include "toonz/txshleveltypes.h"
#include "toonz/levelproperties.h"
#include "toonz/toonzscene.h"
#include "toonz/sceneproperties.h"
#include "toonz/preferences.h"
#include "toonz/tscenehandle.h"
#include "toonz/txsheethandle.h"
#include "toonz/tframehandle.h"
#include "toonz/tcolumnhandle.h"
#include "toonz/tobjecthandle.h"
#include "toonz/tpalettehandle.h"
#include "toonz/txshlevelhandle.h"
#include "toonz/txshcell.h"
#include "toonz/tstageobject.h"
#include "toonz/tstageobjectspline.h"
#include "toonz/tstageobjecttree.h"
#include "toonz/dpiscale.h"
#include "toonz/palettecontroller.h"
#include "toonz/tonionskinmaskhandle.h"
#include "toutputproperties.h"

// TnzCore includes
#include "tvectorimage.h"
#include "timagecache.h"
#include "tstroke.h"
#include "tcolorstyles.h"
#include "ttoonzimage.h"
#include "trasterimage.h"
#include "strokeselection.h"
#include "tundo.h"

#include "toonzvectorbrushtool.h"

//*****************************************************************************************
//    Local namespace
//*****************************************************************************************

namespace {

typedef std::pair<std::string, TTool::ToolTargetType> ToolKey;
typedef std::multimap<ToolKey, TTool*> ToolTable;

//===================================================================

// Local classes

struct DummyTool final : public TTool {
  ToolType getToolType() const override {
    return TTool::LevelReadTool;
  }  // Test level type
  ToolTargetType getTargetType() const {
    return TTool::NoTarget;
  }  // Works on nothing
  int getCursorId() const override {
    return ToolCursor::ForbiddenCursor;
  }  // Forbids everything
  DummyTool(): TTool("T_Dummy") {}
} theDummyTool;

// Local functions

ToolTable& toolTable()
  { static ToolTable t; return t; }

//-------------------------------------------------------------------

class ToolSelector {
  std::string m_toolName;

public:
  ToolSelector(std::string toolName) : m_toolName(toolName) {}

  void selectTool() {
    TTool::Application *app = TTool::getApplication();
    if (app) app->getCurrentTool()->setTool(QString::fromStdString(m_toolName));
  }
};

//===================================================================

// Local functions

TFrameId getNewFrameId(TXshSimpleLevel *sl, int row) {
  TFrameId fid(row + 1);
  if (sl->isFid(fid)) {
    fid = TFrameId(fid.getNumber(), 'a');
    while (fid.getLetter().toUtf8().at(0) < 'z' && sl->isFid(fid))
      fid = TFrameId(fid.getNumber(), fid.getLetter().toUtf8().at(0) + 1);
  }
  return fid;
}

TFrameId getDesiredFId(TXshCellColumn *column, int r0, TXshSimpleLevel *sl,
                       int row, TFrameId &maxFId) {
  // search upper cells in the current column and return the next fids to be
  // inserted if the maximum fid has no suffix it returns next number, otherwise
  // returns next suffix.
  maxFId = TFrameId(0);
  // in case inserting a new frame on the top
  if (row <= r0) return TFrameId(1);
  TFrameId neighborFId;
  for (int r = row - 1; r >= r0; r--) {
    if (sl != column->getCell(r).getSimpleLevel()) continue;
    TFrameId tmpFId = column->getCell(r).getFrameId();
    if (neighborFId.isEmptyFrame()) neighborFId = tmpFId;
    if (maxFId < tmpFId) maxFId = tmpFId;
  }

  QByteArray suffix = maxFId.getLetter().toUtf8();
  // increment letter
  if (suffix.size() == 1 &&
      ((suffix.at(0) >= 'A' && suffix.at(0) < 'Z') ||
       (suffix.at(0) >= 'a' && suffix.at(0) < 'z')) &&
      maxFId == neighborFId) {
    return TFrameId(maxFId.getNumber(), suffix.at(0) + 1);
  } else
    return TFrameId(maxFId.getNumber() + 1);
}

}  // namespace

//*****************************************************************************************
//    TTool  static members
//*****************************************************************************************

TTool::Application *TTool::m_application   = 0;
std::set<TFrameId> TTool::m_selectedFrames = std::set<TFrameId>();
bool TTool::m_isLevelCreated               = false;
bool TTool::m_isFrameCreated               = false;
bool TTool::m_isLevelRenumbererd           = false;

// m_cellsData
// brutto brutto. fix quick & dirty del baco #6213 (undo con animation sheet)
// bisogna ripensare la logica degli undo e del touchImage
// m_cellsData viene inizializzato nel touchImage() in modalita' animation sheet
// contiene una o due terne che rappresentano range di celle (dell'xsheet)
// modificate dall'inserimento
// di un nuovo frame: [r0,r1,type].
// type = 0 : vecchio (cella[r0-1]) => nuovo
// type = 1 : vuoto => vecchio (cella[r0-1])
// type = 2 : vuoto => nuovo
// cfr. il codice di TTool::touchImage()
// ToolUtils::TToolUndo::removeLevelAndFrameIfNeeded()

std::vector<TTool::CellOps> TTool::m_cellsData;
std::vector<TFrameId> TTool::m_oldFids;
std::vector<TFrameId> TTool::m_newFids;

//*****************************************************************************************
//    TTool  implementation
//*****************************************************************************************

TTool::TTool(std::string name)
    : m_name(name)
    , m_viewer(0)
    , m_targetType(NoTarget)
    , m_enabled(true)
    , m_active(false)
    , m_picking(false) {}

//-------------------------------------------------------------------

unsigned int TTool::getToolHints() const
  { return HintAssistants | HintAssistantsGuidelines | HintReplicators; }

//-------------------------------------------------------------------

TTool *TTool::getTool(std::string toolName, ToolTargetType targetType) {
  // if to this name and target type was assigned more then one tool
  // then select tool which more compatible with default target type

  int defTarget = 0;
  switch(Preferences::instance()->getDefLevelType()) {
  case PLI_XSHLEVEL:  defTarget = VectorImage; break;
  case TZP_XSHLEVEL:  defTarget = ToonzImage;  break;
  case OVL_XSHLEVEL:  defTarget = RasterImage; break;
  case META_XSHLEVEL: defTarget = MetaImage;   break;
  default:            defTarget = 0;           break;
  }

  bool isDefault = false;
  int target = 0;
  TTool *tool = 0;

  std::pair<ToolTable::iterator, ToolTable::iterator> range =
    toolTable().equal_range(std::make_pair(toolName, targetType));
  for(ToolTable::iterator it = range.first; it != range.second; ++it) {
    int t = it->second->getTargetType();
    bool d = (bool)(t & defTarget);
    if (!tool || (d && !isDefault) || (d == isDefault && t > target)) {
      isDefault = d;
      target = t;
      tool = it->second;
    }
  }

  return tool;
}

//-----------------------------------------------------------------------------

void TTool::bind( int targetType,
                  const std::string &alias1,
                  const std::string &alias2,
                  const std::string &alias3 )
{
  bind(targetType);
  if ( !alias1.empty()
    && alias1 != m_name )
      bind(alias1, targetType);
  if ( !alias2.empty()
    && alias2 != m_name
    && alias2 != alias1 )
      bind(alias2, targetType);
  if ( !alias3.empty()
    && alias3 != m_name
    && alias3 != alias1
    && alias3 != alias2 )
      bind(alias3, targetType);
}

//-----------------------------------------------------------------------------

void TTool::bind(const std::string &name, int targetType) {
  static std::set<std::string> registeredNames;

  m_targetType = targetType;

  ToolTargetType targets[] = {
    EmptyTarget,
    ToonzImage,
    VectorImage,
    RasterImage,
    MeshImage,
    MetaImage };
  int targetsCount = sizeof(targets)/sizeof(*targets);

  if (!registeredNames.count(name)) {
    registeredNames.insert(name);

    // Initialize with the dummy tool
    for(int i = 0; i < targetsCount; ++i)
      if (!toolTable().count(std::make_pair(name, targets[i])))
        toolTable().insert(
          std::make_pair(std::make_pair(name, targets[i]), &theDummyTool));

    ToolSelector *toolSelector = new ToolSelector(name);
    CommandManager::instance()->setHandler(
        name.c_str(), new CommandHandlerHelper<ToolSelector>(
                          toolSelector, &ToolSelector::selectTool));
  }

  for(int i = 0; i < targetsCount; ++i)
    if (targetType & targets[i])
      toolTable().insert(
        std::make_pair(std::make_pair(name, targets[i]), this));
}

//-----------------------------------------------------------------------------

ToolOptionsBox *TTool::createOptionsBox() {
  TPaletteHandle *currPalette =
      m_application->getPaletteController()->getCurrentLevelPalette();
  ToolHandle *currTool = m_application->getCurrentTool();
  return new GenericToolOptionsBox(0, this, currPalette, 0, currTool);
}

//-----------------------------------------------------------------------------

double TTool::getPixelSize() const {
  return m_viewer ? m_viewer->getPixelSize() : 1.0;
}

//-----------------------------------------------------------------------------

TXshCell TTool::getImageCell() {
  assert(m_application);

  TXshCell result;

  TFrameHandle *currentFrame    = m_application->getCurrentFrame();
  TXshLevelHandle *currentLevel = m_application->getCurrentLevel();

  if (currentFrame->isEditingLevel()) {
    if (TXshLevel *xl = currentLevel->getLevel()) {
      if (TXshSimpleLevel *sl = xl->getSimpleLevel()) {
        result.m_level   = xl;
        result.m_frameId = currentFrame->getFid();
      }
    }
  } else {
    if (TXsheet *xsh = m_application->getCurrentXsheet()->getXsheet()) {
      if (!m_application->getCurrentObject()->isSpline()) {
        int row = currentFrame->getFrame();
        int col = m_application->getCurrentColumn()->getColumnIndex();

        result = xsh->getCell(row, col);
      }
    }
  }

  return result;
}

//-----------------------------------------------------------------------------

TImage *TTool::getImage(bool toBeModified, int subsampling) {
  assert(m_application);

  if (m_application->getCurrentFrame()->isPlaying())
    toBeModified =
        false;  // In playback mode, you are not going to modify images
                // Probably useless - tools are disabled when playing...
  const TXshCell &cell = getImageCell();
  if (cell.isEmpty()) {
    TObjectHandle *currentObject = m_application->getCurrentObject();
    return currentObject->isSpline() ? currentObject->getSplineImage()
                                     : (TImage *)0;
  } else
    return cell.getImage(toBeModified, subsampling).getPointer();
}

//-----------------------------------------------------------------------------

TImage *TTool::touchImage() {
  if (!m_application) return 0;

  m_cellsData.clear();
  m_oldFids.clear();
  m_newFids.clear();

  m_isLevelCreated     = false;
  m_isFrameCreated     = false;
  m_isLevelRenumbererd = false;
  Preferences *pref    = Preferences::instance();

  bool isAutoCreateEnabled        = pref->isAutoCreateEnabled();
  bool animationSheetEnabled      = pref->isAnimationSheetEnabled();
  bool isAutoStretchEnabled       = pref->isAutoStretchEnabled();
  bool isAutoRenumberEnabled      = pref->isAutorenumberEnabled();
  bool isCreateInHoldCellsEnabled = pref->isCreationInHoldCellsEnabled();

  TFrameHandle *currentFrame    = m_application->getCurrentFrame();
  TXshLevelHandle *currentLevel = m_application->getCurrentLevel();

  TFrameId tmplFId = m_application->getCurrentScene()
                         ->getScene()
                         ->getProperties()
                         ->formatTemplateFIdForInput();

  if (currentFrame->isEditingLevel()) {
    // Editing level

    // no level => return 0
    TXshLevel *xl = currentLevel->getLevel();
    if (!xl) return 0;
    TXshSimpleLevel *sl = xl->getSimpleLevel();
    if (!sl || sl->isEmpty()) return 0;

    TFrameId fid = currentFrame->getFid();
    TImageP img  = sl->getFrame(fid, true);
    if (!img) {
      // no drawing found
      if (sl->isSubsequence() || sl->isReadOnly() || !isAutoCreateEnabled)
        return 0;

      // create a new drawing
      img = sl->createEmptyFrame();
      // modify frameId to be with the same frame format as existing frames
      sl->formatFId(fid, tmplFId);
      sl->setFrame(fid, img);
      currentLevel->notifyLevelChange();
      m_isFrameCreated = true;
    }
    return img.getPointer();
  }

  //- - - - editing xsheet case starts here - - - -

  if (m_application->getCurrentObject()->isSpline()) return 0;

  TSceneHandle *currentScene = m_application->getCurrentScene();
  ToonzScene *scene          = currentScene->getScene();
  int row                    = currentFrame->getFrame();
  int col = m_application->getCurrentColumn()->getColumnIndex();
  if (col < 0) return 0;

  TXsheetHandle *currentXsheet = m_application->getCurrentXsheet();
  TXsheet *xsh                 = currentXsheet->getXsheet();
  if (!xsh) return 0;

  TXshCell cell       = xsh->getCell(row, col);
  TXshSimpleLevel *sl = cell.getSimpleLevel();

  if (sl) {
    // current cell is not empty
    if (isCreateInHoldCellsEnabled && row > 0 &&
        xsh->getCell(row - 1, col) == xsh->getCell(row, col)) {
      // CreateInHoldCells is enabled and the current cell is a "hold".
      // We must create a new drawing.
      // measure the hold length (starting from the current row) : r0-r1
      int r0 = row, r1 = row;
      if (isAutoStretchEnabled)
        while (xsh->getCell(r1 + 1, col) == cell) r1++;
      // find the proper frameid (possibly addisng suffix, in order to avoid a
      // fid already used)
      // find the proper frameid
      TFrameId fid;
      TXshCellColumn *column = xsh->getColumn(col)->getCellColumn();
      if (isAutoRenumberEnabled && column) {
        TFrameId maxFid;
        if (animationSheetEnabled) {
          fid    = TFrameId(row + 1);
          maxFid = TFrameId(row);
        } else {
          int r_begin, r_end;
          column->getRange(r_begin, r_end);
          fid = getDesiredFId(column, r_begin, sl, row, maxFid);
        }
        // renumber fids
        sl->getFids(m_oldFids);
        m_isLevelRenumbererd = ToolUtils::renumberForInsertFId(
            sl, fid, maxFid, scene->getTopXsheet());
        if (m_isLevelRenumbererd) sl->getFids(m_newFids);
      } else
        fid = (animationSheetEnabled) ? getNewFrameId(sl, row)
                                      : sl->index2fid(sl->getFrameCount());
      // create the new drawing
      TImageP img      = sl->createEmptyFrame();
      m_isFrameCreated = true;
      // modify frameId to be with the same frame format as existing frames
      sl->formatFId(fid, tmplFId);
      // insert the drawing in the level
      sl->setFrame(fid, img);
      // update the cell
      cell = TXshCell(sl, fid);
      // update the xsheet (change the current cell and possibly all the
      // following "hold")
      for (int r = r0; r <= r1; r++) xsh->setCell(r, col, cell);
      // notify
      currentXsheet->notifyXsheetChanged();
      currentScene->notifyCastChange();
      currentLevel->notifyLevelChange();
      m_cellsData.push_back({r0, r1, CellOps::ExistingToNew});
    }
    // if the level does not contain a frame in the current cell
    // (i.e. drawing on the cell with red numbers)
    else if (!sl->isFid(cell.getFrameId())) {
      // no drawing found
      if (sl->isSubsequence() || sl->isReadOnly() || !isAutoCreateEnabled)
        return 0;
      // create a new drawing
      TImageP img = sl->createEmptyFrame();
      sl->setFrame(cell.getFrameId(), img);
      currentXsheet->notifyXsheetChanged();
      currentLevel->notifyLevelChange();
      m_isFrameCreated = true;
      return img.getPointer();
    }

    // we've found the image. return it.
    return cell.getImage(true).getPointer();
  }

  // current cell is empty.
  if (!isAutoCreateEnabled) return 0;

  // get the column range
  int r0, r1;
  xsh->getCellRange(col, r0, r1);
  // in case the column is not empty
  if (r0 <= r1) {
    // We must create a new drawing in the column level and possibly add "holds"

    // find the last not-empty cell before the current one (a) and the first
    // after (b)
    int a = row - 1, b = row + 1;
    while (a >= r0 && xsh->getCell(a, col).isEmpty()) a--;
    while (b <= r1 && xsh->getCell(b, col).isEmpty()) b++;

    // find the level we must attach to
    if (a >= r0) {
      // there is a not-empty cell before the current one
      sl = xsh->getCell(a, col).getSimpleLevel();
    } else if (b <= r1) {
      sl = xsh->getCell(b, col).getSimpleLevel();
    }
    if (sl && !sl->isSubsequence() && !sl->isReadOnly()) {
      // note: sl should be always !=0 (the column is not empty)
      // if - for some reason - it is == 0 or it is not editable,
      // then we skip to empty-column behaviour

      // create the drawing
      // find the proper frameid
      TFrameId fid;
      TXshCellColumn *column = xsh->getColumn(col)->getCellColumn();
      if (isAutoRenumberEnabled && column) {
        TFrameId maxFid(row);
        fid = (animationSheetEnabled)
                  ? TFrameId(row + 1)
                  : getDesiredFId(column, r0, sl, row, maxFid);
        sl->getFids(m_oldFids);
        m_isLevelRenumbererd = ToolUtils::renumberForInsertFId(
            sl, fid, maxFid, scene->getTopXsheet());
        if (m_isLevelRenumbererd) sl->getFids(m_newFids);
      } else
        fid = (animationSheetEnabled) ? getNewFrameId(sl, row)
                                      : sl->index2fid(sl->getFrameCount());
      // create the new drawing
      TImageP img      = sl->createEmptyFrame();
      m_isFrameCreated = true;

      // modify frameId to be with the same frame format as existing frames
      sl->formatFId(fid, tmplFId);
      // insert the drawing in the level
      sl->setFrame(fid, img);
      // update the cell
      cell = TXshCell(sl, fid);
      xsh->setCell(row, col, cell);

      // create holds
      if (!isAutoStretchEnabled) {
        m_cellsData.push_back({row, row, CellOps::BlankToNew});
      } else {
        if (a >= r0) {
          // create a hold before : [a+1, row-1]
          TXshCell aCell = xsh->getCell(a, col);
          for (int i = a + 1; i < row; i++) xsh->setCell(i, col, aCell);
          m_cellsData.push_back({a + 1, row - 1, CellOps::BlankToExisting});

          if (b <= r1 && xsh->getCell(b, col).getSimpleLevel() == sl) {
            // create also a hold after
            for (int i = row + 1; i < b; i++) xsh->setCell(i, col, cell);
            m_cellsData.push_back({row, b - 1, CellOps::BlankToNew});
          } else {
            m_cellsData.push_back({row, row, CellOps::BlankToNew});
          }
        } else if (b <= r1) {
          // create a hold after
          for (int i = row + 1; i < b; i++) xsh->setCell(i, col, cell);
          m_cellsData.push_back({row, b - 1, CellOps::BlankToNew});
        }
      }
      // notify & return
      currentXsheet->notifyXsheetChanged();
      currentScene->notifyCastChange();
      currentLevel->notifyLevelChange();
      return cell.getImage(true).getPointer();
    }
  }

  // - - - - empty column case starts here - - - -
  // autoCreate is enabled: we must create a new level
  
  // select one from supported level types
  // default level type is preffered
  int levelType = pref->getDefLevelType();
  int toolLevelType = UNKNOWN_XSHLEVEL;
  bool found = false;

  if ( m_targetType & MetaImage )
    { toolLevelType = META_XSHLEVEL; found = found || toolLevelType == levelType; }
  if ( m_targetType & RasterImage )
    { toolLevelType = OVL_XSHLEVEL;  found = found || toolLevelType == levelType; }
  if ( m_targetType & ToonzImage )
    { toolLevelType = TZP_XSHLEVEL;  found = found || toolLevelType == levelType; }
  if ( m_targetType & VectorImage )
    { toolLevelType = PLI_XSHLEVEL;  found = found || toolLevelType == levelType; }

  if (toolLevelType == UNKNOWN_XSHLEVEL) return 0;
  if (!found) levelType = toolLevelType;

  TXshLevel *xl    = scene->createNewLevel(levelType);
  sl               = xl->getSimpleLevel();
  m_isLevelCreated = true;

  // create the drawing
  TFrameId fid = animationSheetEnabled ? getNewFrameId(sl, row) : TFrameId(1);
  TImageP img  = sl->createEmptyFrame();
  m_isFrameCreated = true;
  // modify frameId to be with the same frame format as existing frames
  sl->formatFId(fid, tmplFId);
  sl->setFrame(fid, img);
  cell = TXshCell(sl, fid);
  xsh->setCell(row, col, cell);
  m_cellsData.push_back({row, row, CellOps::BlankToNew});  // vuoto => nuovo
  currentXsheet->notifyXsheetChanged();
  currentScene->notifyCastChange();
  currentLevel->notifyLevelChange();
  return img.getPointer();
}

//-----------------------------------------------------------------------------

void TTool::updateToolsPropertiesTranslation() {
  ToolTable::iterator tt, tEnd(toolTable().end());
  for (tt = toolTable().begin(); tt != tEnd; ++tt)
    tt->second->updateTranslation();
}

//-----------------------------------------------------------------------------

void TTool::invalidate(const TRectD &rect) {
  if (m_viewer) {
    if (rect.isEmpty())
      m_viewer->GLInvalidateAll();
    else {
      TPointD dpiScale(1, 1);
      TXshSimpleLevel *sl =
          getApplication()->getCurrentLevel()->getSimpleLevel();
      if (sl) dpiScale = getCurrentDpiScale(sl, getCurrentFid());
      m_viewer->GLInvalidateRect(getCurrentColumnMatrix() *
                                 TScale(dpiScale.x, dpiScale.y) * rect);
    }
  }
}

//-----------------------------------------------------------------------------

int TTool::pick(const TPointD &p) {
  if (!m_viewer) return 0;

  m_picking = true;
  int ret   = m_viewer->pick(p);
  m_picking = false;

  return ret;
}

//-----------------------------------------------------------------------------

TXsheet *TTool::getXsheet() const {
  if (!m_application) return 0;
  return m_application->getCurrentXsheet()->getXsheet();
}

//-----------------------------------------------------------------------------

int TTool::getFrame() {
  if (!m_application) return 0;
  return m_application->getCurrentFrame()->getFrame();
}

//-----------------------------------------------------------------------------

int TTool::getColumnIndex() {
  if (!m_application) return 0;
  return m_application->getCurrentColumn()->getColumnIndex();
}

//-----------------------------------------------------------------------------

TStageObjectId TTool::getObjectId() const {
  if (!m_application) return TStageObjectId();
  return m_application->getCurrentObject()->getObjectId();
}

//------------------------------------------------------------

TTool::Application *TTool::getApplication() {
  if (m_application == 0)
    assert(!"you MUST call the TTool::setApplication function in the main of the program!");
  return m_application;
}

//-----------------------------------------------------------------------------

/*! Notify change of current image: update icon and notify level change.
    If current object is a spline commit spline changed.
    If current mode is EditingLevel touch current frame.
*/
void TTool::notifyImageChanged() {
  onImageChanged();

  if (!m_application) return;

  m_application->getCurrentScene()->setDirtyFlag(true);
  if (m_application->getCurrentFrame()->isEditingLevel()) {
    TXshLevel *xl = m_application->getCurrentLevel()->getLevel();
    if (!xl) return;
    TXshSimpleLevel *sl = xl->getSimpleLevel();
    if (!sl) return;
    TFrameId fid = m_application->getCurrentFrame()->getFid();
    sl->touchFrame(fid);
    // sl->setDirtyFlag(true);
    IconGenerator::instance()->invalidate(sl, fid);
    IconGenerator::instance()->invalidateSceneIcon();
  } else {
    TXsheet *xsh = m_application->getCurrentXsheet()->getXsheet();
    if (!xsh) return;

    TObjectHandle *currentObject = m_application->getCurrentObject();

    if (currentObject->isSpline()) {
      m_application->getCurrentObject()->commitSplineChanges();
      TStageObject *pegbar = xsh->getStageObject(currentObject->getObjectId());
      IconGenerator::instance()->invalidate(pegbar->getSpline());
    } else {
      int row = m_application->getCurrentFrame()->getFrame();
      int col = m_application->getCurrentColumn()->getColumnIndex();
      if (col < 0) return;
      TXshCell cell       = xsh->getCell(row, col);
      TXshSimpleLevel *sl = cell.getSimpleLevel();
      if (sl) {
        IconGenerator::instance()->invalidate(sl, cell.m_frameId);
        sl->touchFrame(cell.m_frameId);
        IconGenerator::instance()->invalidateSceneIcon();
      }
    }
  }
  m_application->getCurrentLevel()->notifyLevelChange();
}

//-----------------------------------------------------------------------------

/*! Notify change of image in \b fid: update icon and notify level change.
 */
void TTool::notifyImageChanged(const TFrameId &fid) {
  onImageChanged();

  if (!m_application) return;

  m_application->getCurrentScene()->setDirtyFlag(true);
  if (m_application->getCurrentFrame()->isEditingLevel()) {
    TXshLevel *xl = m_application->getCurrentLevel()->getLevel();
    if (!xl) return;
    TXshSimpleLevel *sl = xl->getSimpleLevel();
    if (!sl) return;
    sl->setDirtyFlag(true);
    IconGenerator::instance()->invalidate(sl, fid);
    IconGenerator::instance()->invalidateSceneIcon();
  } else {
    int row = m_application->getCurrentFrame()->getFrame();
    int col = m_application->getCurrentColumn()->getColumnIndex();
    if (col < 0) return;
    TXsheet *xsh = m_application->getCurrentXsheet()->getXsheet();
    if (!xsh) return;
    TXshCell cell       = xsh->getCell(row, col);
    TXshSimpleLevel *sl = cell.getSimpleLevel();
    if (sl) {
      IconGenerator::instance()->invalidate(sl, fid);
      IconGenerator::instance()->invalidateSceneIcon();
      sl->setDirtyFlag(true);
    }
  }
  m_application->getCurrentLevel()->notifyLevelChange();
}

//-----------------------------------------------------------------------------

TFrameId TTool::getCurrentFid() const {
  if (!m_application) return TFrameId();

  TFrameHandle *fh = m_application->getCurrentFrame();

  if (fh->isEditingLevel()) return fh->getFid();

  int row = m_application->getCurrentFrame()->getFrame();
  int col = m_application->getCurrentColumn()->getColumnIndex();
  TXshCell cell =
      m_application->getCurrentXsheet()->getXsheet()->getCell(row, col);
  if (cell.isEmpty()) return TFrameId::NO_FRAME;

  return cell.getFrameId();
}

//-----------------------------------------------------------------------------

TAffine TTool::getCurrentColumnMatrix(int frame) const {
  return getColumnMatrix(m_application->getCurrentColumn()->getColumnIndex(),
                         frame);
}

//-----------------------------------------------------------------------------

TAffine TTool::getCurrentColumnParentMatrix() const {
  if (!m_application) return TAffine();

  TFrameHandle *fh = m_application->getCurrentFrame();
  if (fh->isEditingLevel()) return TAffine();
  int frame       = fh->getFrame();
  int columnIndex = m_application->getCurrentColumn()->getColumnIndex();
  TXsheet *xsh    = m_application->getCurrentXsheet()->getXsheet();
  TStageObjectId parentId =
      xsh->getStageObjectParent(TStageObjectId::ColumnId(columnIndex));
  return xsh->getPlacement(parentId, frame);
}

//-----------------------------------------------------------------------------

TAffine TTool::getCurrentObjectParentMatrix() const {
  if (!m_application) return TAffine();

  TXsheet *xsh = m_application->getCurrentXsheet()->getXsheet();
  int frame    = m_application->getCurrentFrame()->getFrame();
  TStageObjectId currentObjectId =
      m_application->getCurrentObject()->getObjectId();
  if (currentObjectId == TStageObjectId::NoneId) return TAffine();
  TStageObjectId parentId = xsh->getStageObjectParent(currentObjectId);
  if (parentId == TStageObjectId::NoneId)
    return TAffine();
  else
    return xsh->getPlacement(parentId, frame);
}

//-----------------------------------------------------------------------------

TAffine TTool::getColumnMatrix(int columnIndex, int frame) const {
  if (!m_application) return TAffine();

  TFrameHandle *fh = m_application->getCurrentFrame();
  if (fh->isEditingLevel()) return TAffine();
  if (frame < 0) frame = fh->getFrame();
  TXsheet *xsh = m_application->getCurrentXsheet()->getXsheet();
  TStageObjectId columnObjId =
      (columnIndex >= 0)
          ? TStageObjectId::ColumnId(columnIndex)
          : TStageObjectId::CameraId(xsh->getCameraColumnIndex());
  TAffine columnPlacement = xsh->getPlacement(columnObjId, frame);
  double columnZ          = xsh->getZ(columnObjId, frame);

  TStageObjectId cameraId = xsh->getStageObjectTree()->getCurrentCameraId();
  TStageObject *camera    = xsh->getStageObject(cameraId);
  TAffine cameraPlacement = camera->getPlacement(frame);
  double cameraZ          = camera->getZ(frame);

  TStageObject *object = xsh->getStageObject(columnObjId);
  TAffine placement;
  TStageObject::perspective(placement, cameraPlacement, cameraZ,
                            columnPlacement, columnZ,
                            object->getGlobalNoScaleZ());

  return placement;
}

//-----------------------------------------------------------------------------

TAffine TTool::getCurrentObjectParentMatrix2() const {
  TTool::Application *app = m_application;
  TFrameHandle *fh        = app->getCurrentFrame();
  if (fh->isEditingLevel()) return TAffine();
  int frame               = fh->getFrame();
  TXsheet *xsh            = app->getCurrentXsheet()->getXsheet();
  TStageObjectId id       = app->getCurrentObject()->getObjectId();
  double objZ             = xsh->getZ(id, frame);
  TStageObjectId parentId = xsh->getStageObjectParent(id);
  if (parentId == TStageObjectId::NoneId) return TAffine();
  id                   = parentId;
  TAffine objPlacement = xsh->getPlacement(id, frame);

  TStageObjectId cameraId = xsh->getStageObjectTree()->getCurrentCameraId();
  TStageObject *camera    = xsh->getStageObject(cameraId);
  TAffine cameraPlacement = camera->getPlacement(frame);
  double cameraZ          = camera->getZ(frame);

  TAffine placement;
  TStageObject::perspective(placement, cameraPlacement, cameraZ, objPlacement,
                            objZ, 0);
  return placement;
}

//-----------------------------------------------------------------------------

void TTool::updateMatrix() {
  assert(m_application);

  if (m_application->getCurrentObject()->isSpline())
    setMatrix(getCurrentObjectParentMatrix2());
  else
    setMatrix(getCurrentColumnMatrix());
}

//-----------------------------------------------------------------------------

void TTool::resetInputMethod() {
  if (m_viewer) m_viewer->resetInputMethod();
}

//-----------------------------------------------------------------------------

bool TTool::isColumnLocked(int columnIndex) const {
  if (columnIndex < 0) return false;
  TXsheet *xsh       = getXsheet();
  TXshColumn *column = xsh->getColumn(columnIndex);
  if (!column) return false;
  return column->isLocked();
}

//-----------------------------------------------------------------------------

QString TTool::updateEnabled() {
  int rowIndex    = m_application->getCurrentFrame()->getFrame();
  int columnIndex = m_application->getCurrentColumn()->getColumnIndex();

  return updateEnabled(rowIndex, columnIndex);
}

// See the overridden function EditTool::updateEnabled() for the Animate Tool
QString TTool::updateEnabled(int rowIndex, int columnIndex) {
  static const struct LevelTypeDesc {
    int levelType;
    ToolTargetType targetType;
    const char *name;
  } types[] = {
    { PLI_XSHLEVEL  , VectorImage , QT_TR_NOOP("Toonz Vector Level") },
    { TZP_XSHLEVEL  , ToonzImage  , QT_TR_NOOP("Toonz Raster Level") },
    { OVL_XSHLEVEL  , RasterImage , QT_TR_NOOP("Raster Level")       },
    { MESH_XSHLEVEL , MeshImage   , QT_TR_NOOP("Mesh Level")         },
    { META_XSHLEVEL , MetaImage   , QT_TR_NOOP("Assistants Level")   },
  };
  static const int typesCnt = sizeof(types)/sizeof(*types);

  
  // Disable every tool during playback
  if (m_application->getCurrentFrame()->isPlaying())
    return (enable(false), QString());

  // Release Generic tools at once
  int toolType   = getToolType();
  int targetType = getTargetType();

  if (toolType == TTool::GenericTool) return (enable(true), QString());

  // Retrieve vars and view modes
  TXsheet *xsh = m_application->getCurrentXsheet()->getXsheet();

  TXshColumn *column = (columnIndex >= 0) ? xsh->getColumn(columnIndex) : 0;

  TXshLevel *xl       = m_application->getCurrentLevel()->getLevel();
  TXshSimpleLevel *sl = xl ? xl->getSimpleLevel() : 0;
  int levelType       = sl ? sl->getType() : NO_XSHLEVEL;

  // If not in Level editor, let's use our current cell from the xsheet to
  // find the nearest level before it
  if (levelType == NO_XSHLEVEL &&
      !m_application->getCurrentFrame()->isEditingLevel()) {
    if (!column || (column && !column->getSoundColumn())) {
      TXshCell cell = xsh->getCell(rowIndex, columnIndex);
      xl            = cell.isEmpty() ? 0 : (TXshLevel *)(&cell.m_level);
      sl            = cell.isEmpty() ? 0 : cell.getSimpleLevel();
      levelType     = cell.isEmpty() ? NO_XSHLEVEL : cell.m_level->getType();
    }
  }

  if (Preferences::instance()->isAutoCreateEnabled()) {
    // If not in Level editor, let's use our current cell from the xsheet to
    // find the nearest level before it
    if (levelType == NO_XSHLEVEL &&
        !m_application->getCurrentFrame()->isEditingLevel()) {
      if (!column || (column && !column->getSoundColumn())) {
        int r0, r1;
        xsh->getCellRange(columnIndex, r0, r1);
        for (int r = std::min(r1, rowIndex); r > r0; r--) {
          TXshCell cell = xsh->getCell(r, columnIndex);
          if (cell.isEmpty()) continue;
          xl        = (TXshLevel *)(&cell.m_level);
          sl        = cell.getSimpleLevel();
          levelType = cell.m_level->getType();
          break;
        }
      }
    }

    // If the current tool does not match the current type, check for
    // a version of the same tool that does
    {
      TTool *tool = this;
      for(int i = 0; i < typesCnt; ++i) {
        if ( levelType == types[i].levelType
          && !(targetType & types[i].targetType) )
        {
          tool = getTool(m_name, types[i].targetType);
          break;
        }
      }
      
      if (tool && tool != this && tool->getTargetType() != TTool::NoTarget)
        return tool->updateEnabled();
    }
  }

  bool spline = m_application->getCurrentObject()->isSpline();

  bool filmstrip = m_application->getCurrentFrame()->isEditingLevel();

  /*-- MultiLayerStylePickerONのときは、現状に関わらず使用可能 --*/
  if (m_name == T_StylePicker &&
      Preferences::instance()->isMultiLayerStylePickerEnabled())
    return (enable(true), QString());

  // Check against camera column
  if (!filmstrip && columnIndex < 0 && (targetType & TTool::EmptyTarget) &&
      (m_name == T_Type || m_name == T_Geometric || m_name == T_Brush))
    return (enable(false), QString());

  bool isZeraryCol =
      column ? (column->getZeraryFxColumn() ? true : false) : false;
  bool isPaletteCol =
      column ? (column->getPaletteColumn() ? true : false) : false;
  bool isMeshCol = column ? (column->getMeshColumn() ? true : false) : false;

  // Check against splines
  if (spline && (toolType & TTool::LevelTool)) {
    return (targetType & Splines)
               ? (enable(true), QString())
               : (enable(false), QObject::tr("The current tool cannot be "
                                             "used to edit a motion path."));
  }

  // Check against unplaced columns (not in filmstrip mode)
  if (column && !filmstrip) {
    if (column->isLocked() && m_name != T_Selection)
      return (enable(false), QObject::tr("The current column is locked."));

    else if (!column->isCamstandVisible())
      return (enable(false), QObject::tr("The current column is hidden."));

    else if (column->getSoundColumn())
      return (enable(false),
              QObject::tr("It is not possible to edit the audio column."));

    else if (column->getSoundTextColumn())
      return (
          enable(false),
          QObject::tr(
              "Note columns can only be edited in the xsheet or timeline."));

    if (toolType == TTool::ColumnTool) {
      // Check column target
      if (column->getLevelColumn() && !(targetType & LevelColumns))
        return (
            enable(false),
            QObject::tr("The current tool cannot be used on a Level column."));

      if (column->getMeshColumn() && !(targetType & MeshColumns))
        return (
            enable(false),
            QObject::tr("The current tool cannot be used on a Mesh column."));
    }
  }

  // Check column tools
  if (toolType == TTool::ColumnTool) {
    if (filmstrip)
      return (
          enable(false),
          QObject::tr("The current tool cannot be used in Level Strip mode."));

    if ((!column || column->isEmpty()) && !(targetType & TTool::EmptyTarget))
      return (enable(false), QString());
  }

  // Check LevelRead & LevelWrite tools
  if (toolType & TTool::LevelTool) {
    // Check against empty levels
    if (!xl)
      return ((targetType & EmptyTarget) && !isZeraryCol && !isPaletteCol &&
              !isMeshCol)
                 ? (enable(true), QString())
                 : (enable(false), QString());

    // Check against simple-level-edness
    if (!sl)
      return (enable(false),
              QObject::tr("The current level is not editable."));  // Does it
                                                                   // happen at
                                                                   // all btw?

    // Check against level types
    {
      for(int i = 0; i < typesCnt; ++i) {
        if (levelType != types[i].levelType) continue;
        if (targetType & types[i].targetType) break;
        
        // if we are here, then the level is not being supported by the tool
        // prepeare a detailed message about it
        
        QString message = QObject::tr("The current tool cannot be used on: ")
                        + QObject::tr(types[i].name);
        
        QString allowedLevels;
        
        // if current tool is dummy, then this->getName() will not informative
        // we need to know the requested tool name instead
        if (TApplication *app = getApplication())
        if (ToolHandle *th = app->getCurrentTool()) {
          std::string name = th->getRequestedToolName().toStdString();
          if (!name.empty()) {
            for(int i = 0; i < typesCnt; ++i) {
              TTool *tool = getTool(name, types[i].targetType);
              if (tool && (tool->getTargetType() & types[i].targetType)) {
                if (!allowedLevels.isEmpty())
                  allowedLevels += QObject::tr(", ");
                allowedLevels += QObject::tr(types[i].name);
              }
            }
          }
        }
        
        if (allowedLevels.isEmpty()) {
          if ( Preferences::instance()->isAutoCreateEnabled()
            && (targetType & EmptyTarget) )
            message += "\n\n" + QObject::tr("You can use this tool on empty cell in Xsheet/Timeline.");
        } else {
          message += "\n\n" + QObject::tr("You can use this tool with: ")
                  +  "\n" + allowedLevels;
          if ( Preferences::instance()->isAutoCreateEnabled()
            && (targetType & EmptyTarget) )
            message += "\n\n" + QObject::tr("Or just choose an empty cell in Xsheet/Timeline.");
        }
        
        enable(false);
        return message;
      }
    }

    // Check against impossibly traceable movements on the column
    if ((levelType & LEVELCOLUMN_XSHLEVEL) && !filmstrip && columnIndex >= 0) {
      TStageObject *obj =
          xsh->getStageObject(TStageObjectId::ColumnId(columnIndex));
      // Test for Mesh-deformed levels
      const TStageObjectId &parentId = obj->getParent();
      if (parentId.isColumn() && obj->getParentHandle()[0] != 'H') {
        TXshSimpleLevel *parentSl =
            xsh->getCell(rowIndex, parentId.getIndex()).getSimpleLevel();
        if (parentSl && parentSl->getType() == MESH_XSHLEVEL &&
            m_name != T_Selection)
          return (
              enable(false),
              QObject::tr(
                  "The current tool cannot be used on a mesh-deformed level"));
      }
    }

    // Check TTool::ImageType tools
    if (toolType == TTool::LevelWriteTool && m_name != T_Selection) {
      // Check level against read-only status
      if (sl->isFrameReadOnly(getCurrentFid()))
        return (enable(false),
                QObject::tr(
                    "The current frame is locked: any editing is forbidden."));

      // Check level type write support
      if (sl->getPath().isUneditable() ||
          sl->is16BitChannelLevel() ||  // Inherited by previous
                                        // implementation.
                                        // Could be fixed?
          sl->getProperties()->getBpp() ==
              1)  // Black & White images. Again, could be fixed?

        return (enable(false),
                QObject::tr("The current level is not editable."));
    }
  }

  return (enable(true), QString());
}

//-----------------------------------------------------------------------------

void TTool::setSelectedFrames(const std::set<TFrameId> &selectedFrames) {
  m_selectedFrames = selectedFrames;
  onSelectedFramesChanged();
}

//-------------------------------------------------------------------------------------------------------------

void TToolViewer::getGuidedFrameIdx(int *backIdx, int *frontIdx) {
  if (!Preferences::instance()->isGuidedDrawingEnabled()) return;

  OnionSkinMask osMask =
      TTool::getApplication()->getCurrentOnionSkin()->getOnionSkinMask();

  if (!osMask.isEnabled() || osMask.isEmpty()) return;

  TFrameHandle *currentFrame = TTool::getApplication()->getCurrentFrame();

  int cidx     = currentFrame->getFrameIndex();
  int mosBack  = 0;
  int mosFront = 0;
  int mosCount = osMask.getMosCount();
  int fosBack  = -1;
  int fosFront = -1;
  int fosCount = osMask.getFosCount();

  // Find onion-skinned drawing that is being used for guided auto inbetween
  if (Preferences::instance()->getGuidedDrawingType() == 1) {
    // Get closest moving unionskin
    for (int i = 0; i < mosCount; i++) {
      int cmos = osMask.getMos(i);
      if (cmos == 0) continue;  // skip current
      if (cmos < 0 && (!mosBack || cmos > mosBack)) mosBack = cmos;
      if (cmos > 0 && (!mosFront || cmos < mosFront)) mosFront = cmos;
    }
    if (mosBack) *backIdx = mosBack + cidx;
    if (mosFront) *frontIdx = mosFront + cidx;

    // Get closest fixed onionskin
    for (int i = 0; i < fosCount; i++) {
      int cfos = osMask.getFos(i);
      if (cfos == cidx) continue;  // skip current
      if (cfos < cidx && (fosBack == -1 || cfos > fosBack)) fosBack = cfos;
      if (cfos > cidx && (fosFront == -1 || cfos < fosFront)) fosFront = cfos;
    }

    if (*backIdx == -1)
      *backIdx = fosBack;
    else if (fosBack != -1)
      *backIdx = std::max(*backIdx, fosBack);
    if (*frontIdx == -1)
      *frontIdx = fosFront;
    else if (fosFront != -1)
      *frontIdx = std::min(*frontIdx, fosFront);
  } else if (Preferences::instance()->getGuidedDrawingType() ==
             2) {  // Furthest drawing
                   // Get moving unionskin
    for (int i = 0; i < mosCount; i++) {
      int cmos = osMask.getMos(i);
      if (cmos == 0) continue;  // skip current
      if (cmos < 0 && (!mosBack || cmos < mosBack)) mosBack = cmos;
      if (cmos > 0 && (!mosFront || cmos > mosFront)) mosFront = cmos;
    }
    if (mosBack) *backIdx = mosBack + cidx;
    if (mosFront) *frontIdx = mosFront + cidx;

    // Get fixed onionskin
    for (int i = 0; i < fosCount; i++) {
      int cfos = osMask.getFos(i);
      if (cfos == cidx) continue;  // skip current
      if (cfos < cidx && (fosBack == -1 || cfos < fosBack)) fosBack = cfos;
      if (cfos > cidx && (fosFront == -1 || cfos > fosFront)) fosFront = cfos;
    }

    if (*backIdx == -1)
      *backIdx = fosBack;
    else if (fosBack != -1)
      *backIdx = std::min(*backIdx, fosBack);
    if (*frontIdx == -1)
      *frontIdx = fosFront;
    else if (fosFront != -1)
      *frontIdx = std::max(*frontIdx, fosFront);
  }
}

//-------------------------------------------------------------------------------------------------------------

void TToolViewer::doPickGuideStroke(const TPointD &pos) {
  int pickerMode = getGuidedStrokePickerMode();

  if (!pickerMode) return;

  if (pickerMode >= -2 && pickerMode <= 2) setGuidedStrokePickerMode(0);

  int osBack  = -1;
  int osFront = -1;
  int os      = -1;

  getGuidedFrameIdx(&osBack, &osFront);

  if (pickerMode < 0)  // Previous Frame
    os = osBack;
  else if (pickerMode > 0)  // Next Frame
    os = osFront;

  TFrameId fid;
  TFrameHandle *currentFrame = TTool::getApplication()->getCurrentFrame();
  TXshSimpleLevel *sl =
      TTool::getApplication()->getCurrentLevel()->getLevel()->getSimpleLevel();
  if (!sl) return;

  if (currentFrame->isEditingScene()) {
    TXsheet *xsh = TTool::getApplication()->getCurrentXsheet()->getXsheet();
    int col      = TTool::getApplication()->getCurrentColumn()->getColumnIndex();
    if (xsh && col >= 0) {
      TXshCell cell = xsh->getCell(os, col);
      if (!cell.isEmpty()) fid = cell.getFrameId();
    }
  } else
    fid = sl->getFrameId(os);

  if (fid.isEmptyFrame()) return;

  TVectorImageP fvi = sl->getFrame(fid, false);
  if (!fvi) return;

  UINT index;
  double t, dist2 = 0;
  double pixelSize = getPixelSize();
  TAffine aff      = getViewMatrix();
  double maxDist   = 5 * pixelSize;
  double maxDist2  = maxDist * maxDist;
  double checkDist = maxDist2 * 4;
  TStroke *strokeRef;
  if (fvi->getNearestStroke(pos, t, index, dist2)) {
    strokeRef          = fvi->getStroke(index);
    TThickPoint cursor = strokeRef->getThickPoint(t);
    double len         = cursor.thick * pixelSize * sqrt(aff.det());
    checkDist          = std::max(checkDist, (len * len));
  }

  if (dist2 >= checkDist)
    index = -1;
  else {
    if (pickerMode < 0)  // Previous Frame
      setGuidedBackStroke(index);
    else if (pickerMode > 0)  // Next Frame
      setGuidedFrontStroke(index);
  }

  if (pickerMode <= -2) {
    if (index != -1) setGuidedStrokePickerMode(pickerMode * -1);
  } else if (pickerMode >= 2) {
    if (pickerMode >= 3 && index != -1) {
      TTool *tool = TTool::getTool(T_Brush, TTool::ToolTargetType::VectorImage);
      ToonzVectorBrushTool *vbTool = (ToonzVectorBrushTool *)tool;
      if (vbTool) {
        vbTool->setViewer(this);
        vbTool->doGuidedAutoInbetween(fid, fvi, strokeRef, false, false, false,
                                      false);
      }

      setGuidedStrokePickerMode(pickerMode * -1);
    }
  }
}

//-------------------------------------------------------------------------------------------------------------

void TTool::tweenSelectedGuideStrokes() {
  if (!getViewer() || !m_application) return;

  TXshSimpleLevel *sl =
      m_application->getCurrentLevel()->getLevel()->getSimpleLevel();
  if (!sl) return;

  int backIdx = -1, frontIdx = -1;

  getViewer()->getGuidedFrameIdx(&backIdx, &frontIdx);

  if (backIdx == -1 || frontIdx == -1) return;

  TFrameHandle *currentFrame = getApplication()->getCurrentFrame();
  int row                    = currentFrame->getFrameIndex();
  TFrameId bFid, cFid, fFid;

  cFid = getCurrentFid();
  if (cFid.isEmptyFrame()) return;

  TVectorImageP cvi = sl->getFrame(cFid, false);
  if (!cvi) return;

  int cStrokeCount = cvi->getStrokeCount();

  if (currentFrame->isEditingScene()) {
    TXsheet *xsh = m_application->getCurrentXsheet()->getXsheet();
    int col      = m_application->getCurrentColumn()->getColumnIndex();
    if (xsh && col >= 0) {
      TXshCell cell = xsh->getCell(backIdx, col);
      if (!cell.isEmpty()) bFid = cell.getFrameId();
      cell = xsh->getCell(frontIdx, col);
      if (!cell.isEmpty()) fFid = cell.getFrameId();
    }
  } else {
    bFid = sl->getFrameId(backIdx);
    fFid = sl->getFrameId(frontIdx);
  }
  if (bFid.isEmptyFrame() || fFid.isEmptyFrame()) return;

  TVectorImageP bvi = sl->getFrame(bFid, false);
  TVectorImageP fvi = sl->getFrame(fFid, false);

  if (!bvi || !fvi) return;

  int bStrokeCount = bvi->getStrokeCount();
  int fStrokeCount = fvi->getStrokeCount();

  if (!bStrokeCount || !fStrokeCount) return;

  int bStrokeIdx = getViewer()->getGuidedBackStroke() != -1
                       ? getViewer()->getGuidedBackStroke()
                       : cStrokeCount;
  int fStrokeIdx = getViewer()->getGuidedFrontStroke() != -1
                       ? getViewer()->getGuidedFrontStroke()
                       : cStrokeCount;

  if (bStrokeIdx >= bStrokeCount || fStrokeIdx >= fStrokeCount) return;

  TStroke *bStroke = bvi->getStroke(bStrokeIdx);
  TStroke *fStroke = fvi->getStroke(fStrokeIdx);

  if (!bStroke || !fStroke) return;

  TTool *tool = TTool::getTool(T_Brush, TTool::ToolTargetType::VectorImage);
  ToonzVectorBrushTool *vbTool = (ToonzVectorBrushTool *)tool;
  if (vbTool) {
    m_isFrameCreated = false;
    m_isLevelCreated = false;
    vbTool->touchImage();
    vbTool->setViewer(m_viewer);
    vbTool->doFrameRangeStrokes(
        bFid, bStroke, fFid, fStroke,
        Preferences::instance()->getGuidedInterpolation(), false, false, false,
        false, false, true);
  }
}

//-------------------------------------------------------------------------------------------------------------

void TTool::tweenGuideStrokeToSelected() {
  if (!getViewer() || !m_application) return;

  TXshSimpleLevel *sl =
      m_application->getCurrentLevel()->getLevel()->getSimpleLevel();
  if (!sl) return;

  int backIdx = -1, frontIdx = -1;

  getViewer()->getGuidedFrameIdx(&backIdx, &frontIdx);

  TFrameHandle *currentFrame = getApplication()->getCurrentFrame();
  int row                    = currentFrame->getFrameIndex();
  TFrameId bFid, cFid, fFid;
  TVectorImageP bvi, cvi, fvi;

  cFid = getCurrentFid();
  if (cFid.isEmptyFrame()) return;

  cvi = sl->getFrame(cFid, false);
  if (!cvi) return;

  int cStrokeCount = cvi->getStrokeCount();
  if (!cStrokeCount) return;

  StrokeSelection *strokeSelection =
      dynamic_cast<StrokeSelection *>(getSelection());
  if (!strokeSelection || strokeSelection->isEmpty()) return;
  const std::set<int> &selectedStrokeIdxs = strokeSelection->getSelection();
  const std::set<int>::iterator it        = selectedStrokeIdxs.begin();
  int cStrokeIdx                          = *it;

  TStroke *cStroke = cvi->getStroke(cStrokeIdx);
  if (!cStroke) return;

  if (backIdx != -1) {
    if (currentFrame->isEditingScene()) {
      TXsheet *xsh = m_application->getCurrentXsheet()->getXsheet();
      int col      = m_application->getCurrentColumn()->getColumnIndex();
      if (xsh && col >= 0) {
        TXshCell cell = xsh->getCell(backIdx, col);
        if (!cell.isEmpty()) bFid = cell.getFrameId();
      }
    } else
      bFid = sl->getFrameId(backIdx);

    if (!bFid.isEmptyFrame()) bvi = sl->getFrame(bFid, false);
  }

  if (frontIdx != -1) {
    if (currentFrame->isEditingScene()) {
      TXsheet *xsh = m_application->getCurrentXsheet()->getXsheet();
      int col      = m_application->getCurrentColumn()->getColumnIndex();
      if (xsh && col >= 0) {
        TXshCell cell = xsh->getCell(frontIdx, col);
        if (!cell.isEmpty()) fFid = cell.getFrameId();
      }
    } else
      fFid = sl->getFrameId(frontIdx);

    if (!fFid.isEmptyFrame()) fvi = sl->getFrame(fFid, false);
  }

  if (!bvi && !fvi) return;

  int bStrokeCount = bvi ? bvi->getStrokeCount() : 0;
  int fStrokeCount = fvi ? fvi->getStrokeCount() : 0;

  if (!bStrokeCount && !fStrokeCount) return;

  int bStrokeIdx = getViewer()->getGuidedBackStroke() != -1
                       ? getViewer()->getGuidedBackStroke()
                       : cStrokeCount;
  int fStrokeIdx = getViewer()->getGuidedFrontStroke() != -1
                       ? getViewer()->getGuidedFrontStroke()
                       : cStrokeCount;

  if ((bStrokeCount && bStrokeIdx >= bStrokeCount) ||
      (fStrokeCount && fStrokeIdx >= fStrokeCount))
    return;

  TStroke *bStroke = bvi ? bvi->getStroke(bStrokeIdx) : 0;
  TStroke *fStroke = fvi ? fvi->getStroke(fStrokeIdx) : 0;

  if (!bStroke && !fStroke) return;

  TTool *tool = TTool::getTool(T_Brush, TTool::ToolTargetType::VectorImage);
  ToonzVectorBrushTool *vbTool = (ToonzVectorBrushTool *)tool;
  if (vbTool) {
    m_isFrameCreated = false;
    m_isLevelCreated = false;
    vbTool->touchImage();
    vbTool->setViewer(m_viewer);
    TUndoManager::manager()->beginBlock();
    if (bStroke)
      vbTool->doFrameRangeStrokes(
          bFid, bStroke, cFid, cStroke,
          Preferences::instance()->getGuidedInterpolation(), false, false,
          false, false, false, false);
    if (fStroke)
      vbTool->doFrameRangeStrokes(
          cFid, cStroke, fFid, fStroke,
          Preferences::instance()->getGuidedInterpolation(), false, false,
          false, false, false, false);
    TUndoManager::manager()->endBlock();
  }
}

//-------------------------------------------------------------------------------------------------------------

void TTool::flipGuideStrokeDirection(int mode) {
  if (!mode) return;

  TXshSimpleLevel *sl =
      m_application->getCurrentLevel()->getLevel()->getSimpleLevel();
  if (!sl) return;

  int osBack  = -1;
  int osFront = -1;
  int os      = -1;
  int strokeIdx;

  getViewer()->getGuidedFrameIdx(&osBack, &osFront);

  if (mode < 0) {  // Previous Frame
    os        = osBack;
    strokeIdx = getViewer()->getGuidedBackStroke();
  } else if (mode > 0) {  // Next Frame
    os        = osFront;
    strokeIdx = getViewer()->getGuidedFrontStroke();
  }

  if (os < 0) return;

  TFrameHandle *currentFrame = getApplication()->getCurrentFrame();
  int row                    = currentFrame->getFrameIndex();
  TFrameId cFid              = getCurrentFid();
  if (cFid.isEmptyFrame()) return;

  TVectorImageP cvi = sl->getFrame(cFid, false);
  if (!cvi) return;

  int cStrokeCount = cvi->getStrokeCount();

  TFrameId fid;
  if (currentFrame->isEditingScene()) {
    TXsheet *xsh = getApplication()->getCurrentXsheet()->getXsheet();
    int col      = getApplication()->getCurrentColumn()->getColumnIndex();
    if (xsh && col >= 0) {
      TXshCell cell = xsh->getCell(os, col);
      if (!cell.isEmpty()) fid = cell.getFrameId();
    }
  } else
    fid = sl->getFrameId(os);

  if (fid.isEmptyFrame()) return;

  TVectorImageP vi = sl->getFrame(fid, false);
  if (!vi) return;

  int strokeCount = vi->getStrokeCount();
  if (!strokeCount) return;

  if (strokeIdx == -1) strokeIdx = cStrokeCount;

  if (strokeIdx >= strokeCount) return;

  TStroke *stroke = vi->getStroke(strokeIdx);
  if (!stroke) return;

  stroke->changeDirection();
  sl->setDirtyFlag(true);
  getViewer()->invalidateAll();
  m_application->getCurrentLevel()->notifyLevelChange();
}
