/*
 * 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 2
 * 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, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * Adapted from the Blender Alembic importer implementation.
 *
 * Modifications Copyright (C) 2021 Tangent Animation.
 * All rights reserved.
 */
#pragma once

#include "usd.h"
#include "usd_reader_prim.h"

namespace blender::io::usd {

class USDXformReader : public USDPrimReader {
 private:
  bool use_parent_xform_;

  /* Indicates if the created object is the root of a
   * transform hierarchy. */
  bool is_root_xform_;

 public:
  USDXformReader(const pxr::UsdPrim &prim,
                 const USDImportParams &import_params,
                 const ImportSettings &settings)
      : USDPrimReader(prim, import_params, settings),
        use_parent_xform_(false),
        is_root_xform_(is_root_xform_prim())
  {
  }

  void create_object(Main *bmain, double motionSampleTime) override;
  void read_object_data(Main *bmain, double motionSampleTime) override;

  void read_matrix(float r_mat[4][4], const float time, const float scale, bool *r_is_constant);

  bool use_parent_xform() const
  {
    return use_parent_xform_;
  }
  void set_use_parent_xform(bool flag)
  {
    use_parent_xform_ = flag;
    is_root_xform_ = is_root_xform_prim();
  }

  bool prim_has_xform_ops() const;

 protected:
  /* Returns true if the contained USD prim is the root of a transform hierarchy. */
  bool is_root_xform_prim() const;
};

}  // namespace blender::io::usd