// Copyright 2016 The Draco Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef DRACO_COMPRESSION_MESH_MESH_ENCODER_H_
#define DRACO_COMPRESSION_MESH_MESH_ENCODER_H_

#include "compression/attributes/mesh_attribute_indices_encoding_data.h"
#include "compression/point_cloud/point_cloud_encoder.h"
#include "mesh/mesh.h"
#include "mesh/mesh_attribute_corner_table.h"

namespace draco {

// Abstract base class for all mesh encoders. It provides some basic
// funcionality that's shared between different encoders.
class MeshEncoder : public PointCloudEncoder {
 public:
  MeshEncoder();

  // Sets the mesh that is going be encoded. Must be called before the Encode()
  // method.
  void SetMesh(const Mesh &m);

  EncodedGeometryType GetGeometryType() const override {
    return TRIANGULAR_MESH;
  }

  // Returns the base connectivity of the encoded mesh (or nullptr if it is not
  // initialized).
  virtual const CornerTable *GetCornerTable() const { return nullptr; }

  // Returns the attribute connectivity data or nullptr if it does not exist.
  virtual const MeshAttributeCornerTable *GetAttributeCornerTable(
      int att_id) const {
    return nullptr;
  }

  // Returns the encoding data for a given attribute or nullptr when the data
  // does not exist.
  virtual const MeshAttributeIndicesEncodingData *GetAttributeEncodingData(
      int att_id) const {
    return nullptr;
  }

  const Mesh *mesh() const { return mesh_; }

 protected:
  bool EncodeGeometryData() override;

  // Needs to be implemented by the derived classes.
  virtual bool EncodeConnectivity() = 0;

  // TODO(ostava): Prediction schemes need refactoring.
  /*
  // This method should be overriden by derived class to perform custom
  // initialization of various prediction schemes.
  virtual bool InitPredictionSchemeInternal(
      const MeshAttributeEncoder *att_encoder,
      PredictionSchemeInterface *scheme) {
    return true;
  }
  */

  void set_mesh(const Mesh *mesh) { mesh_ = mesh; }

 private:
  const Mesh *mesh_;
};

}  // namespace draco

#endif  // DRACO_COMPRESSION_MESH_MESH_ENCODER_H_