/* SPDX-FileCopyrightText: 2013 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

/** \file
 * \ingroup depsgraph
 */

#pragma once

#include "BLI_string_ref.hh"

#include "RNA_types.hh"

#include "intern/builder/deg_builder_relations.h"

namespace blender {

struct FCurve;

namespace deg {

/* Helper class for determining which relations are needed between driver evaluation nodes. */
class DriverDescriptor {
 public:
  /**
   * Drivers are grouped by their RNA prefix. The prefix is the part of the RNA
   * path up to the last dot, the suffix is the remainder of the RNA path:
   *
   * \code{.unparsed}
   * fcu->rna_path                     rna_prefix              rna_suffix
   * -------------------------------   ----------------------  ----------
   * 'color'                           ''                      'color'
   * 'rigidbody_world.time_scale'      'rigidbody_world'       'time_scale'
   * 'pose.bones["master"].location'   'pose.bones["master"]'  'location'
   * \endcode
   */
  StringRef rna_prefix;
  StringRef rna_suffix;

  DriverDescriptor(PointerRNA *id_ptr, FCurve *fcu);

  bool driver_relations_needed() const;
  bool is_array() const;
  /** Assumes that 'other' comes from the same RNA group, that is, has the same RNA path prefix. */
  bool is_same_array_as(const DriverDescriptor &other) const;
  OperationKey depsgraph_key() const;

 private:
  PointerRNA *id_ptr_;
  FCurve *fcu_;
  bool driver_relations_needed_;

  PointerRNA pointer_rna_;
  PropertyRNA *property_rna_;
  bool is_array_;

  bool determine_relations_needed();
  void split_rna_path();
  bool resolve_rna();
};

/**
 * Returns whether the data at the given path may be implicitly shared (also see
 * #ImplicitSharingInfo). If it is shared, writing to it through RNA will make a
 * local copy that can be edited without affecting the other users.
 *
 * If multi-threaded writing to the path is required, one should trigger making
 * the mutable copy before multi-threaded writing starts. Otherwise there is a
 * race condition where each thread tries to make its own copy. The "unsharing"
 * can be triggered by doing a dummy-write to it.
 */
bool data_path_maybe_shared(const ID &id, StringRef data_path);

}  // namespace deg
}  // namespace blender
