/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2022 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/>.

***/

#ifndef TIMELINEUNDOSPLIT_H
#define TIMELINEUNDOSPLIT_H

#include "node/output/track/track.h"

namespace olive {

class BlockSplitCommand : public UndoCommand {
public:
  BlockSplitCommand(Block* block, rational point) :
    block_(block),
    new_block_(nullptr),
    point_(point),
    reconnect_tree_command_(nullptr)
  {
  }

  virtual ~BlockSplitCommand() override
  {
    delete reconnect_tree_command_;
  }

  virtual Project* GetRelevantProject() const override
  {
    return block_->project();
  }

  /**
   * @brief Access the second block created as a result. Only valid after redo().
   */
  Block* new_block()
  {
    return new_block_;
  }

protected:
  virtual void redo() override;

  virtual void undo() override;

private:
  Block* block_;
  Block* new_block_;

  rational old_length_;
  rational point_;

  MultiUndoCommand* reconnect_tree_command_;

  NodeInput moved_transition_;

};

class BlockSplitPreservingLinksCommand : public UndoCommand {
public:
  BlockSplitPreservingLinksCommand(const QVector<Block *> &blocks, const QList<rational>& times) :
    blocks_(blocks),
    times_(times)
  {
  }

  virtual ~BlockSplitPreservingLinksCommand() override
  {
    qDeleteAll(commands_);
  }

  virtual Project* GetRelevantProject() const override
  {
    return blocks_.first()->project();
  }

protected:
  virtual void redo() override;

  virtual void undo() override
  {
    for (int i=commands_.size()-1; i>=0; i--) {
      commands_.at(i)->undo_now();
    }
  }

private:
  QVector<Block *> blocks_;

  QList<rational> times_;

  QVector<UndoCommand*> commands_;

};

class TrackSplitAtTimeCommand : public UndoCommand {
public:
  TrackSplitAtTimeCommand(Track* track, rational point) :
    track_(track),
    point_(point),
    command_(nullptr)
  {
  }

  virtual ~TrackSplitAtTimeCommand() override
  {
    delete command_;
  }

  virtual Project* GetRelevantProject() const override
  {
    return track_->project();
  }

protected:
  virtual void prepare() override;

  virtual void redo() override
  {
    if (command_) {
      command_->redo_now();
    }
  }

  virtual void undo() override
  {
    if (command_) {
      command_->undo_now();
    }
  }

private:
  Track* track_;

  rational point_;

  UndoCommand* command_;

};

}

#endif // TIMELINEUNDOSPLIT_H