/**********************************************************************

Audacity: A Digital Audio Editor

LabelTextHandle.cpp

Paul Licameli split from TrackPanel.cpp

**********************************************************************/


#include "LabelTextHandle.h"

#include "LabelTrackView.h"

#include "../../../HitTestResult.h"
#include "../../../LabelTrack.h"
#include "ProjectAudioIO.h"
#include "ProjectHistory.h"
#include "../../../RefreshCode.h"
#include "SelectionState.h"
#include "../../../TrackPanelMouseEvent.h"
#include "ViewInfo.h"
#include "../../../../images/Cursors.h"

#include <wx/clipbrd.h>

LabelTextHandle::LabelTextHandle
( const std::shared_ptr<LabelTrack> &pLT, int labelNum )
   : mpLT{ pLT }
   , mLabelNum{ labelNum }
{
}

void LabelTextHandle::Enter(bool, AudacityProject *)
{
#ifdef EXPERIMENTAL_TRACK_PANEL_HIGHLIGHTING
   mChangeHighlight = RefreshCode::RefreshCell;
#endif
}

HitTestPreview LabelTextHandle::HitPreview()
{
   static auto ibeamCursor =
      ::MakeCursor(wxCURSOR_IBEAM, IBeamCursorXpm, 17, 16);
   return {
      XO("Click to edit label text"),
      ibeamCursor.get()
   };
}

UIHandlePtr LabelTextHandle::HitTest
(std::weak_ptr<LabelTextHandle> &holder,
 const wxMouseState &state, const std::shared_ptr<LabelTrack> &pLT)
{
   // If Control is down, let the select handle be hit instead
   int labelNum;
   if (!state.ControlDown() &&
       (labelNum =
          LabelTrackView::OverATextBox(*pLT, state.m_x, state.m_y) ) >= 0) {
      auto result = std::make_shared<LabelTextHandle>( pLT, labelNum );
      result = AssignUIHandlePtr(holder, result);
      return result;
   }

   return {};
}

LabelTextHandle::~LabelTextHandle()
{
}

std::shared_ptr<const Track> LabelTextHandle::FindTrack() const
{
   return mpLT.lock();
}

void LabelTextHandle::HandleTextClick(AudacityProject &project, const wxMouseEvent & evt)
{
   auto pTrack = mpLT.lock();
   if (!pTrack)
      return;

   auto &view = LabelTrackView::Get( *pTrack );
   if (evt.ButtonDown())
   {
      const auto selIndex = LabelTrackView::OverATextBox( *pTrack, evt.m_x, evt.m_y );
      if ( selIndex != -1 ) {
         if (evt.LeftDown()) {
            mRightDragging = false;
            // Find the NEW drag end
            auto position = view.FindCursorPosition(selIndex, evt.m_x );

            // Anchor shift-drag at the farther end of the previous highlight
            // that is farther from the click, on Mac, for consistency with
            // its text editors, but on the others, re-use the previous
            // anchor.
            auto initial = view.GetInitialCursorPosition();
            if (evt.ShiftDown()) {
#ifdef __WXMAC__
               // Set the drag anchor at the end of the previous selection
               // that is farther from the NEW drag end
               const auto current = view.GetCurrentCursorPosition();
               if ( abs( position - current ) > abs( position - initial ) )
                  initial = current;
#else
               // initial position remains as before
#endif
            }
            else
               initial = position;

            view.SetTextSelection(selIndex, initial, position );
         }
         else
         {
            if (!view.IsTextSelected(project))
            {
               auto position = view.FindCursorPosition(selIndex, evt.m_x);
               view.SetTextSelection(selIndex, position, position);
            }
            // Actually this might be right or middle down
            mRightDragging = true;
         }
         // Middle click on GTK: paste from primary selection
#if defined(__WXGTK__) && (HAVE_GTK)
         if (evt.MiddleDown()) {
            // Check for a click outside of the selected label's text box; in this
            // case PasteSelectedText() will start a NEW label at the click
            // location
            if (!LabelTrackView::OverTextBox(&labelStruct, evt.m_x, evt.m_y))
               view.ResetTextSelection();
            double t = zoomInfo.PositionToTime(evt.m_x, r.x);
            newSel = SelectedRegion(t, t);
         }
#endif
      }
#if defined(__WXGTK__) && (HAVE_GTK)
      if (evt.MiddleDown()) {
         // Paste text, making a NEW label if none is selected.
         wxTheClipboard->UsePrimarySelection(true);
         view.PasteSelectedText(project, newSel.t0(), newSel.t1());
         wxTheClipboard->UsePrimarySelection(false);
      }
#endif
   }
}

bool LabelTextHandle::HandlesRightClick()
{
   return true;
}

UIHandle::Result LabelTextHandle::Click
(const TrackPanelMouseEvent &evt, AudacityProject *pProject)
{
   auto pLT = mpLT.lock();
   if (!pLT)
      return RefreshCode::Cancelled;

   auto result = LabelDefaultClickHandle::Click( evt, pProject );

   const wxMouseEvent &event = evt.event;
   auto &viewInfo = ViewInfo::Get( *pProject );

   HandleTextClick(*pProject, event);

   return result | RefreshCode::RefreshCell;
}

void LabelTextHandle::HandleTextDragRelease(
   AudacityProject &project, const wxMouseEvent & evt)
{
   auto pTrack = mpLT.lock();
   if (!pTrack)
      return;
   auto &view = LabelTrackView::Get( *pTrack );

   if(evt.LeftUp())
   {
#if 0
      // AWD: Due to wxWidgets bug #7491 (fix not ported to 2.8 branch) we
      // should never write the primary selection. We can enable this block
      // when we move to the 3.0 branch (or if a fixed 2.8 version is released
      // and we can do a runtime version check)
#if defined (__WXGTK__) && defined (HAVE_GTK)
      // On GTK, if we just dragged out a text selection, set the primary
      // selection
      if (mInitialCursorPos != mCurrentCursorPos) {
         wxTheClipboard->UsePrimarySelection(true);
         CopySelectedText();
         wxTheClipboard->UsePrimarySelection(false);
      }
#endif
#endif

      return;
   }

   if(evt.Dragging())
   {
      auto index = view.GetTextEditIndex(project);
      if (!mRightDragging && index != -1)
         // Update drag end
         view.SetCurrentCursorPosition(view.FindCursorPosition(index, evt.m_x ));
      return;
   }

   if (evt.RightUp())
   {
      auto index = view.GetTextEditIndex(project);
      if(index != -1 &&
         LabelTrackView::OverTextBox(pTrack->GetLabel(index), evt.m_x, evt.m_y)) 
      {
         // popup menu for editing
         // TODO: handle context menus via CellularPanel?
         view.ShowContextMenu( project );
      }
   }

   return;
}

UIHandle::Result LabelTextHandle::Drag
(const TrackPanelMouseEvent &evt, AudacityProject *pProject)
{
   auto &project = *pProject;
   using namespace RefreshCode;
   auto result = LabelDefaultClickHandle::Drag( evt, pProject );

   const wxMouseEvent &event = evt.event;
   auto pLT = TrackList::Get( *pProject ).Lock(mpLT);
   if(pLT)
      HandleTextDragRelease( project, event );

   // locate the initial mouse position
   if (event.LeftIsDown()) {
      if (mLabelTrackStartXPos == -1) {
         mLabelTrackStartXPos = event.m_x;
         mLabelTrackStartYPos = event.m_y;

         auto pView = pLT ? &LabelTrackView::Get( *pLT ) : nullptr;
         if (pLT && (pView->GetTextEditIndex( project ) != -1) &&
             LabelTrackView::OverTextBox(
               pLT->GetLabel(pView->GetTextEditIndex( project )),
               mLabelTrackStartXPos,
               mLabelTrackStartYPos))
            mLabelTrackStartYPos = -1;
      }
      // if initial mouse position in the text box
      // then only drag text
      if (mLabelTrackStartYPos == -1)
         result |= RefreshCell;
   }

   return result;
}

HitTestPreview LabelTextHandle::Preview
(const TrackPanelMouseState &, AudacityProject *)
{
   return HitPreview();
}

UIHandle::Result LabelTextHandle::Release
(const TrackPanelMouseEvent &evt, AudacityProject *pProject,
 wxWindow *pParent)
{
   auto result = LabelDefaultClickHandle::Release( evt, pProject, pParent );

   // Only selected a part of a text string and changed track selectedness.
   // No undoable effects.

   const wxMouseEvent &event = evt.event;
   auto pLT = TrackList::Get( *pProject ).Lock(mpLT);
   if (pLT)
      HandleTextDragRelease( *pProject, event );

   // handle mouse left button up
   if (event.LeftUp())
      mLabelTrackStartXPos = -1;

   return result | RefreshCode::RefreshNone;
}

UIHandle::Result LabelTextHandle::Cancel( AudacityProject *pProject )
{
   auto result = LabelDefaultClickHandle::Cancel( pProject );
   return result | RefreshCode::RefreshAll;
}
