/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2019 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 "undo.h"

#include "core.h"
#include "node/graph.h"
#include "node/block/transition/transition.h"
#include "widget/nodeview/nodeviewundo.h"

OLIVE_NAMESPACE_ENTER

Node* TakeNodeFromParentGraph(Node* n, QObject* new_parent = nullptr)
{
  static_cast<NodeGraph*>(n->parent())->TakeNode(n, new_parent);

  return n;
}

BlockResizeCommand::BlockResizeCommand(Block *block, rational new_length, QUndoCommand* parent) :
  UndoCommand(parent),
  block_(block),
  old_length_(block->length()),
  new_length_(new_length)
{
}

Project *BlockResizeCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(block_->parent())->project();
}

void BlockResizeCommand::redo_internal()
{
  block_->set_length_and_media_out(new_length_);
}

void BlockResizeCommand::undo_internal()
{
  block_->set_length_and_media_out(old_length_);
}

BlockResizeWithMediaInCommand::BlockResizeWithMediaInCommand(Block *block, rational new_length, QUndoCommand *parent) :
  UndoCommand(parent),
  block_(block),
  old_length_(block->length()),
  new_length_(new_length)
{
}

Project *BlockResizeWithMediaInCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(block_->parent())->project();
}

void BlockResizeWithMediaInCommand::redo_internal()
{
  block_->set_length_and_media_in(new_length_);
}

void BlockResizeWithMediaInCommand::undo_internal()
{
  block_->set_length_and_media_in(old_length_);
}

BlockSetMediaInCommand::BlockSetMediaInCommand(Block *block, rational new_media_in, QUndoCommand* parent) :
  UndoCommand(parent),
  block_(block),
  old_media_in_(block->media_in()),
  new_media_in_(new_media_in)
{
}

Project *BlockSetMediaInCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(block_->parent())->project();
}

void BlockSetMediaInCommand::redo_internal()
{
  block_->set_media_in(new_media_in_);
}

void BlockSetMediaInCommand::undo_internal()
{
  block_->set_media_in(old_media_in_);
}

TrackRippleRemoveBlockCommand::TrackRippleRemoveBlockCommand(TrackOutput *track, Block *block, QUndoCommand *parent) :
  UndoCommand(parent),
  track_(track),
  block_(block)
{
}

Project *TrackRippleRemoveBlockCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(block_->parent())->project();
}

void TrackRippleRemoveBlockCommand::redo_internal()
{
  before_ = block_->previous();
  track_->RippleRemoveBlock(block_);
}

void TrackRippleRemoveBlockCommand::undo_internal()
{
  if (before_) {
    track_->InsertBlockAfter(block_, before_);
  } else {
    track_->PrependBlock(block_);
  }
}

TrackInsertBlockAfterCommand::TrackInsertBlockAfterCommand(TrackOutput *track,
                                                           Block *block,
                                                           Block *before,
                                                           QUndoCommand *parent) :
  UndoCommand(parent),
  track_(track),
  block_(block),
  before_(before)
{
}

Project *TrackInsertBlockAfterCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(block_->parent())->project();
}

void TrackInsertBlockAfterCommand::redo_internal()
{
  track_->InsertBlockAfter(block_, before_);
}

void TrackInsertBlockAfterCommand::undo_internal()
{
  track_->RippleRemoveBlock(block_);
}

TrackRippleRemoveAreaCommand::TrackRippleRemoveAreaCommand(TrackOutput *track, rational in, rational out, QUndoCommand *parent) :
  UndoCommand(parent),
  track_(track),
  in_(in),
  out_(out),
  splice_(false),
  trim_out_(nullptr),
  trim_in_(nullptr),
  insert_(nullptr)
{
}

Project *TrackRippleRemoveAreaCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(track_->parent())->project();
}

void TrackRippleRemoveAreaCommand::SetInsert(Block *insert)
{
  insert_ = insert;
}

void TrackRippleRemoveAreaCommand::redo_internal()
{
  // Iterate through blocks determining which need trimming/removing/splitting
  foreach (Block* block, track_->Blocks()) {
    if (block->in() < in_ && block->out() > out_) {
      // The area entirely within this Block
      trim_out_ = block;
      splice_ = true;

      // We don't need to do anything else here
      break;
    } else if (block->in() >= in_ && block->out() <= out_) {
      // This Block's is entirely within the area
      removed_blocks_.append(block);
    } else if (block->in() < in_ && block->out() >= in_) {
      // This Block's out point exceeds `in`
      trim_out_ = block;
    } else if (block->in() <= out_ && block->out() > out_) {
      // This Block's in point exceeds `out`
      trim_in_ = block;
    }
  }

  track_->BlockInvalidateCache();

  // If we picked up a block to splice
  if (splice_) {

    // Split the block here
    trim_in_ = static_cast<Block*>(trim_out_->copy());

    static_cast<NodeGraph*>(track_->parent())->AddNode(trim_in_);
    Node::CopyInputs(trim_out_, trim_in_);

    trim_out_old_length_ = trim_out_->length();
    trim_out_->set_length_and_media_out(in_ - trim_out_->in());

    trim_in_->set_length_and_media_in(trim_out_old_length_ - (out_ - trim_out_->in()));

    track_->InsertBlockAfter(trim_in_, trim_out_);

  } else {

    // If we picked up a block to trim the in point of
    if (trim_in_) {
      trim_in_old_length_ = trim_in_->length();
      trim_in_new_length_ = trim_in_->out() - out_;
    }

    // If we picked up a block to trim the out point of
    if (trim_out_) {
      trim_out_old_length_ = trim_out_->length();
      trim_out_new_length_ = in_ - trim_out_->in();
    }

    // If we picked up a block to trim the in point of
    if (trim_in_old_length_ != trim_in_new_length_) {
      trim_in_->set_length_and_media_in(trim_in_new_length_);
    }

    // Remove all blocks that are flagged for removal
    foreach (Block* remove_block, removed_blocks_) {
      track_->RippleRemoveBlock(remove_block);

      BlockUnlinkAllCommand* unlink_command = new BlockUnlinkAllCommand(remove_block);
      unlink_command->redo();
      remove_block_commands_.append(unlink_command);

      NodeRemoveWithExclusiveDeps* remove_command = new NodeRemoveWithExclusiveDeps(static_cast<NodeGraph*>(remove_block->parent()), remove_block);
      remove_command->redo();
      remove_block_commands_.append(remove_command);
    }

    // If we picked up a block to trim the out point of
    if (trim_out_old_length_ != trim_out_new_length_) {
      trim_out_->set_length_and_media_out(trim_out_new_length_);
    }

  }

  // If we were given a block to insert, insert it here
  if (insert_) {
    if (!trim_out_) {
      // This is the start of the Sequence
      track_->PrependBlock(insert_);
    } else if (!trim_in_) {
      // This is the end of the Sequence
      track_->AppendBlock(insert_);
    } else {
      // This is somewhere in the middle of the Sequence
      track_->InsertBlockAfter(insert_, trim_out_);
    }
  }

  track_->UnblockInvalidateCache();

  track_->InvalidateCache(TimeRange(in_, insert_ ? out_ : RATIONAL_MAX),
                          track_->block_input(),
                          track_->block_input());
}

void TrackRippleRemoveAreaCommand::undo_internal()
{
  track_->BlockInvalidateCache();

  // If we were given a block to insert, insert it here
  if (insert_ != nullptr) {
    track_->RippleRemoveBlock(insert_);
  }

  if (splice_) {

    // trim_in_ is our copy and trim_out_ is our original
    track_->RippleRemoveBlock(trim_in_);
    delete TakeNodeFromParentGraph(trim_in_);
    trim_out_->set_length_and_media_out(trim_out_old_length_);

  } else {

    // If we picked up a block to trim the out point of
    if (trim_out_old_length_ != trim_out_new_length_) {
      trim_out_->set_length_and_media_out(trim_out_old_length_);
    }

    // Restore blocks that were removed
    for (int i=remove_block_commands_.size()-1;i>=0;i--) {
      UndoCommand* command = remove_block_commands_.at(i);
      command->undo();
      delete command;
    }
    remove_block_commands_.clear();

    for (int i=removed_blocks_.size()-1;i>=0;i--) {
      Block* remove_block = removed_blocks_.at(i);

      if (trim_in_) {
        track_->InsertBlockBefore(remove_block, trim_in_);
      } else {
        track_->AppendBlock(remove_block);
      }
    }
    removed_blocks_.clear();

    // If we picked up a block to trim the in point of
    if (trim_in_old_length_ != trim_in_new_length_) {
      trim_in_->set_length_and_media_in(trim_in_old_length_);
    }

  }

  track_->UnblockInvalidateCache();

  track_->InvalidateCache(TimeRange(in_, insert_ ? out_ : RATIONAL_MAX), track_->block_input(), track_->block_input());
}

TrackPlaceBlockCommand::TrackPlaceBlockCommand(TrackList *timeline, int track, Block *block, rational in, QUndoCommand *parent) :
  TrackRippleRemoveAreaCommand(nullptr, in, 0, parent), // Out gets set correctly in redo()
  timeline_(timeline),
  track_index_(track),
  gap_(nullptr)
{
  insert_ = block;
}

void TrackPlaceBlockCommand::redo_internal()
{
  added_track_count_ = 0;

  // Get track (or make it if necessary)
  while (track_index_ >= timeline_->GetTracks().size()) {
    timeline_->AddTrack();

    added_track_count_++;
  }

  track_ = timeline_->GetTrackAt(track_index_);

  append_ = (in_ >= track_->track_length());

  // Check if the placement location is past the end of the timeline
  if (append_) {
    if (in_ > track_->track_length()) {
      // If so, insert a gap here
      gap_ = new GapBlock();
      gap_->set_length_and_media_out(in_ - track_->track_length());
      static_cast<NodeGraph*>(track_->parent())->AddNode(gap_);
      track_->AppendBlock(gap_);
    }

    track_->AppendBlock(insert_);
  } else {
    out_ = in_ + insert_->length();

    // Place the Block at this point
    TrackRippleRemoveAreaCommand::redo_internal();
  }
}

void TrackPlaceBlockCommand::undo_internal()
{
  if (append_) {
    track_->RippleRemoveBlock(insert_);

    if (gap_ != nullptr) {
      track_->RippleRemoveBlock(gap_);
      delete TakeNodeFromParentGraph(gap_);
    }
  } else {
    TrackRippleRemoveAreaCommand::undo_internal();
  }

  for (;added_track_count_>0;added_track_count_--) {
    timeline_->RemoveTrack();
  }
}

BlockSplitCommand::BlockSplitCommand(TrackOutput* track, Block *block, rational point, QUndoCommand *parent) :
  UndoCommand(parent),
  track_(track),
  block_(block),
  new_length_(point - block->in()),
  old_length_(block->length()),
  point_(point)
{
  Q_ASSERT(point > block_->in() && point < block_->out() && block_->type() == Block::kClip);

  // Ensures that this block is deleted if this action is undone
  new_block_ = static_cast<Block*>(block_->copy());
  new_block_->setParent(&memory_manager_);

  // Determine if the block outputs to an "out" transition
  foreach (NodeEdgePtr edge, block_->output()->edges()) {
    if (edge->input()->parentNode()->IsBlock()
        && static_cast<Block*>(edge->input()->parentNode())->type() == Block::kTransition
        && edge->input() == static_cast<TransitionBlock*>(edge->input()->parentNode())->out_block_input()) {
      transitions_to_move_.append(edge->input());
    }
  }
}

Project *BlockSplitCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(block_->parent())->project();
}

void BlockSplitCommand::redo_internal()
{
  // FIXME: Reintroduce this optimization when block waveforms update automatically
  //  track_->BlockInvalidateCache();

  static_cast<NodeGraph*>(block_->parent())->AddNode(new_block_);
  Node::CopyInputs(block_, new_block_);

  rational new_part_length = block_->length() - (point_ - block_->in());

  block_->set_length_and_media_out(new_length_);

  new_block_->set_length_and_media_in(new_part_length);

  track_->InsertBlockAfter(new_block_, block_);

  foreach (NodeInput* transition, transitions_to_move_) {
    NodeParam::DisconnectEdge(block_->output(), transition);
    NodeParam::ConnectEdge(new_block_->output(), transition);
  }

  //  track_->UnblockInvalidateCache();
}

void BlockSplitCommand::undo_internal()
{
  //  track_->BlockInvalidateCache();

  block_->set_length_and_media_out(old_length_);
  track_->RippleRemoveBlock(new_block_);

  TakeNodeFromParentGraph(new_block_, &memory_manager_);

  foreach (NodeInput* transition, transitions_to_move_) {
    NodeParam::DisconnectEdge(new_block_->output(), transition);
    NodeParam::ConnectEdge(block_->output(), transition);
  }

  //  track_->UnblockInvalidateCache();
}

Block *BlockSplitCommand::new_block()
{
  return new_block_;
}

TrackSplitAtTimeCommand::TrackSplitAtTimeCommand(TrackOutput *track, rational point, QUndoCommand *parent) :
  UndoCommand(parent),
  track_(track)
{
  // Find Block that contains this time
  foreach (Block* b, track->Blocks()) {
    if (b->out() == point) {
      // This time is between blocks, no split needs to occur
      return;
    } else if (b->in() < point && b->out() > point) {
      // We found the Block, split it
      new BlockSplitCommand(track_, b, point, this);
      return;
    }
  }
}

Project *TrackSplitAtTimeCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(track_->parent())->project();
}

TrackReplaceBlockCommand::TrackReplaceBlockCommand(TrackOutput* track, Block *old, Block *replace, QUndoCommand *parent) :
  UndoCommand(parent),
  track_(track),
  old_(old),
  replace_(replace)
{
}

Project *TrackReplaceBlockCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(track_->parent())->project();
}

void TrackReplaceBlockCommand::redo_internal()
{
  track_->ReplaceBlock(old_, replace_);
}

void TrackReplaceBlockCommand::undo_internal()
{
  track_->ReplaceBlock(replace_, old_);
}

TrackPrependBlockCommand::TrackPrependBlockCommand(TrackOutput *track, Block *block, QUndoCommand *parent) :
  UndoCommand(parent),
  track_(track),
  block_(block)
{
}

Project *TrackPrependBlockCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(track_->parent())->project();
}

void TrackPrependBlockCommand::redo_internal()
{
  track_->PrependBlock(block_);
}

void TrackPrependBlockCommand::undo_internal()
{
  track_->RippleRemoveBlock(block_);
}

BlockSplitPreservingLinksCommand::BlockSplitPreservingLinksCommand(const QVector<Block *> &blocks, const QList<rational> &times, QUndoCommand *parent) :
  UndoCommand(parent),
  blocks_(blocks),
  times_(times)
{
  QVector< QVector<Block*> > split_blocks(times.size());

  for (int i=0;i<times.size();i++) {
    const rational& time = times.at(i);

    QVector<Block*> splits(blocks.size());

    for (int j=0;j<blocks.size();j++) {
      Block* b = blocks.at(j);

      if (b->in() < time && b->out() > time) {
        TrackOutput* track = TrackOutput::TrackFromBlock(b);

        Q_ASSERT(track);

        BlockSplitCommand* split_command = new BlockSplitCommand(track, b, time, this);
        splits.replace(j, split_command->new_block());
      } else {
        splits.replace(j, nullptr);
      }
    }

    split_blocks.replace(i, splits);
  }

  // Now that we've determined all the splits, we can relink everything
  for (int i=0;i<blocks_.size();i++) {
    Block* a = blocks.at(i);

    for (int j=0;j<blocks.size();j++) {
      if (i == j) {
        continue;
      }

      Block* b = blocks.at(j);

      if (Block::AreLinked(a, b)) {
        // These blocks are linked, ensure all the splits are linked too

        foreach (const QVector<Block*>& split_list, split_blocks) {
          Block::Link(split_list.at(i), split_list.at(j));
        }
      }
    }
  }
}

Project *BlockSplitPreservingLinksCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(blocks_.first()->parent())->project();
}

TrackCleanGapsCommand::TrackCleanGapsCommand(TrackList *track_list, int index, QUndoCommand *parent) :
  UndoCommand(parent),
  track_list_(track_list),
  track_index_(index)
{
}

Project *TrackCleanGapsCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(track_list_->GetParentGraph())->project();
}

void TrackCleanGapsCommand::redo_internal()
{
  GapBlock* on_gap = nullptr;
  QList<GapBlock*> consecutive_gaps;

  TrackOutput* track = track_list_->GetTrackAt(track_index_);

  foreach (Block* b, track->Blocks()) {
    if (b->type() == Block::kGap) {
      if (on_gap) {
        consecutive_gaps.append(static_cast<GapBlock*>(b));
      } else {
        on_gap = static_cast<GapBlock*>(b);
      }
    } else if (on_gap) {
      merged_gaps_.append({on_gap, on_gap->length(), consecutive_gaps});

      // Remove each gap and add to the length of the merged
      // We can block the IC signal because merging gaps won't actually change anything
      track->BlockInvalidateCache();
      rational new_gap_length = on_gap->length();
      foreach (GapBlock* gap, consecutive_gaps) {
        track->RippleRemoveBlock(gap);
        static_cast<NodeGraph*>(track->parent())->TakeNode(gap, &memory_manager_);

        new_gap_length += gap->length();
      }
      on_gap->set_length_and_media_out(new_gap_length);
      track->UnblockInvalidateCache();

      // Reset state
      on_gap = nullptr;
      consecutive_gaps.clear();
    }
  }

  if (on_gap) {
    // If we're here, we found at least one or several
    removed_end_gaps_.append(on_gap);
    removed_end_gaps_.append(consecutive_gaps);

    foreach (GapBlock* gap, removed_end_gaps_) {
      track->RippleRemoveBlock(gap);
      static_cast<NodeGraph*>(track->parent())->TakeNode(gap, &memory_manager_);
    }
  }
}

void TrackCleanGapsCommand::undo_internal()
{
  TrackOutput* track = track_list_->GetTrackAt(track_index_);

  // Restored removed end gaps
  foreach (GapBlock* gap, removed_end_gaps_) {
    static_cast<NodeGraph*>(track->parent())->AddNode(gap);
    track->AppendBlock(gap);
  }
  removed_end_gaps_.clear();

  track->BlockInvalidateCache();

  for (int i=merged_gaps_.size()-1;i>=0;i--) {
    const MergedGap& merge_info = merged_gaps_.at(i);

    merge_info.merged->set_length_and_media_out(merge_info.original_length);

    GapBlock* last_gap_added = merge_info.merged;

    foreach (GapBlock* gap, merge_info.removed) {
      static_cast<NodeGraph*>(track->parent())->AddNode(gap);
      track->InsertBlockAfter(gap, last_gap_added);
      last_gap_added = gap;
    }
  }

  track->UnblockInvalidateCache();

  merged_gaps_.clear();
}

BlockSetSpeedCommand::BlockSetSpeedCommand(Block *block, const rational &new_speed, QUndoCommand *parent) :
  UndoCommand(parent),
  block_(block),
  old_speed_(block->speed()),
  new_speed_(new_speed)
{
}

Project *BlockSetSpeedCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(block_->parent())->project();
}

void BlockSetSpeedCommand::redo_internal()
{
  block_->set_speed(new_speed_);
}

void BlockSetSpeedCommand::undo_internal()
{
  block_->set_speed(old_speed_);
}

TimelineRippleDeleteGapsAtRegionsCommand::TimelineRippleDeleteGapsAtRegionsCommand(ViewerOutput *vo, const TimeRangeList &regions, QUndoCommand *parent) :
  UndoCommand(parent),
  timeline_(vo),
  regions_(regions)
{
}

Project *TimelineRippleDeleteGapsAtRegionsCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(timeline_->parent())->project();
}

void TimelineRippleDeleteGapsAtRegionsCommand::redo_internal()
{
  foreach (const TimeRange& range, regions_) {
    rational max_ripple_length = range.length();

    QList<Block*> blocks_around_range;

    foreach (TrackOutput* track, timeline_->Tracks()) {
      // Get the block from every other track that is either at or just before our block's in point
      Block* block_at_time = track->NearestBlockBeforeOrAt(range.in());

      if (block_at_time) {
        if (block_at_time->type() == Block::kGap) {
          max_ripple_length = qMin(block_at_time->length(), max_ripple_length);
        } else {
          max_ripple_length = 0;
          break;
        }

        blocks_around_range.append(block_at_time);
      }
    }

    if (max_ripple_length > 0) {
      foreach (Block* resize, blocks_around_range) {
        if (resize->length() == max_ripple_length) {
          // Remove block entirely
          TrackRippleRemoveBlockCommand* remove_command = new TrackRippleRemoveBlockCommand(TrackOutput::TrackFromBlock(resize), resize);
          remove_command->redo();
          commands_.append(remove_command);
        } else {
          // Resize block
          BlockResizeCommand* resize_command = new BlockResizeCommand(resize, resize->length() - max_ripple_length);
          resize_command->redo();
          commands_.append(resize_command);
        }
      }
    }
  }
}

void TimelineRippleDeleteGapsAtRegionsCommand::undo_internal()
{
  for (int i=commands_.size()-1;i>=0;i--) {
    commands_.at(i)->undo();
    delete commands_.at(i);
  }
  commands_.empty();
}

WorkareaSetEnabledCommand::WorkareaSetEnabledCommand(Project* project, TimelinePoints *points, bool enabled, QUndoCommand *parent) :
  UndoCommand(parent),
  project_(project),
  points_(points),
  old_enabled_(points_->workarea()->enabled()),
  new_enabled_(enabled)
{
}

Project *WorkareaSetEnabledCommand::GetRelevantProject() const
{
  return project_;
}

void WorkareaSetEnabledCommand::redo_internal()
{
  points_->workarea()->set_enabled(new_enabled_);
}

void WorkareaSetEnabledCommand::undo_internal()
{
  points_->workarea()->set_enabled(old_enabled_);
}

WorkareaSetRangeCommand::WorkareaSetRangeCommand(Project* project, TimelinePoints *points, const TimeRange &range, QUndoCommand *parent) :
  UndoCommand(parent),
  project_(project),
  points_(points),
  old_range_(points_->workarea()->range()),
  new_range_(range)
{
}

Project *WorkareaSetRangeCommand::GetRelevantProject() const
{
  return project_;
}

void WorkareaSetRangeCommand::redo_internal()
{
  points_->workarea()->set_range(new_range_);
}

void WorkareaSetRangeCommand::undo_internal()
{
  points_->workarea()->set_range(old_range_);
}

BlockLinkCommand::BlockLinkCommand(Block *a, Block *b, bool link, QUndoCommand *parent) :
  UndoCommand(parent),
  a_(a),
  b_(b),
  link_(link)
{
}

Project *BlockLinkCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(a_->parent())->project();
}

void BlockLinkCommand::redo_internal()
{
  if (link_) {
    done_ = Block::Link(a_, b_);
  } else {
    done_ = Block::Unlink(a_, b_);
  }
}

void BlockLinkCommand::undo_internal()
{
  if (done_) {
    if (link_) {
      Block::Unlink(a_, b_);
    } else {
      Block::Link(a_, b_);
    }
  }
}

BlockUnlinkAllCommand::BlockUnlinkAllCommand(Block *block, QUndoCommand *parent) :
  UndoCommand(parent),
  block_(block)
{
}

Project *BlockUnlinkAllCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(block_->parent())->project();
}

void BlockUnlinkAllCommand::redo_internal()
{
  unlinked_ = block_->linked_clips();

  foreach (Block* link, unlinked_) {
    Block::Unlink(block_, link);
  }
}

void BlockUnlinkAllCommand::undo_internal()
{
  foreach (Block* link, unlinked_) {
    Block::Link(block_, link);
  }

  unlinked_.clear();
}

BlockLinkManyCommand::BlockLinkManyCommand(const QList<Block *> blocks, bool link, QUndoCommand *parent) :
  UndoCommand(parent),
  blocks_(blocks)
{
  foreach (Block* a, blocks_) {
    foreach (Block* b, blocks_) {
      if (a != b) {
        new BlockLinkCommand(a, b, link, this);
      }
    }
  }
}

Project *BlockLinkManyCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(blocks_.first()->parent())->project();
}

BlockEnableDisableCommand::BlockEnableDisableCommand(Block *block, bool enabled, QUndoCommand *parent) :
  UndoCommand(parent),
  block_(block),
  old_enabled_(block_->is_enabled()),
  new_enabled_(enabled)
{
}

Project *BlockEnableDisableCommand::GetRelevantProject() const
{
  return static_cast<Sequence*>(block_->parent())->project();
}

void BlockEnableDisableCommand::redo_internal()
{
  block_->set_enabled(new_enabled_);
}

void BlockEnableDisableCommand::undo_internal()
{
  block_->set_enabled(old_enabled_);
}

OLIVE_NAMESPACE_EXIT