/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2020 Olive Team

  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 "razor.h"
#include "widget/timelinewidget/timelinewidget.h"

namespace olive {

RazorTool::RazorTool(TimelineWidget* parent) :
  BeamTool(parent)
{
}

void RazorTool::MousePress(TimelineViewMouseEvent *event)
{
  split_tracks_.clear();

  MouseMove(event);
}

void RazorTool::MouseMove(TimelineViewMouseEvent *event)
{
  if (!dragging_) {
    drag_start_ = ValidatedCoordinate(event->GetCoordinates(true));
    dragging_ = true;
  }

  // Split at the current cursor track
  Track::Reference split_track = event->GetTrack();

  if (!split_tracks_.contains(split_track)) {
    split_tracks_.append(split_track);
  }
}

void RazorTool::MouseRelease(TimelineViewMouseEvent *event)
{
  Q_UNUSED(event)

  // Always split at the same time
  rational split_time = drag_start_.GetFrame();

  QVector<Block*> blocks_to_split;

  foreach (const Track::Reference& track_ref, split_tracks_) {
    Track* track = parent()->GetTrackFromReference(track_ref);

    if (track == nullptr || track->IsLocked()) {
      continue;
    }

    Block* block_at_time = track->NearestBlockBefore(split_time);

    // Ensure there's a valid block here
    if (block_at_time
        && block_at_time->out() != split_time
        && block_at_time->type() == Block::kClip
        && !blocks_to_split.contains(block_at_time)) {
      blocks_to_split.append(block_at_time);

      // Add links if no alt is held
      if (!(event->GetModifiers() & Qt::AltModifier)) {
        foreach (Block* link, block_at_time->linked_clips()) {
          if (!blocks_to_split.contains(link)) {
            blocks_to_split.append(link);
          }
        }
      }
    }
  }

  split_tracks_.clear();

  if (!blocks_to_split.isEmpty()) {
    Core::instance()->undo_stack()->push(new BlockSplitPreservingLinksCommand(blocks_to_split, {split_time}));
  }

  dragging_ = false;
}

}
