// Copyright (c) the JPEG XL Project Authors. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

#ifndef LIB_JXL_ENC_MODULAR_H_
#define LIB_JXL_ENC_MODULAR_H_

#include "lib/jxl/base/status.h"
#include "lib/jxl/dec_modular.h"
#include "lib/jxl/enc_bit_writer.h"
#include "lib/jxl/enc_cache.h"
#include "lib/jxl/enc_params.h"
#include "lib/jxl/frame_header.h"
#include "lib/jxl/image.h"
#include "lib/jxl/image_bundle.h"
#include "lib/jxl/modular/encoding/encoding.h"
#include "lib/jxl/modular/modular_image.h"

namespace jxl {

struct AuxOut;

class ModularFrameEncoder {
 public:
  ModularFrameEncoder(const FrameHeader& frame_header,
                      const CompressParams& cparams_orig);
  Status ComputeEncodingData(const FrameHeader& frame_header,
                             const ImageMetadata& metadata,
                             Image3F* JXL_RESTRICT color,
                             const std::vector<ImageF>& extra_channels,
                             PassesEncoderState* JXL_RESTRICT enc_state,
                             const JxlCmsInterface& cms, ThreadPool* pool,
                             AuxOut* aux_out, bool do_color);
  // Encodes global info (tree + histograms) in the `writer`.
  Status EncodeGlobalInfo(BitWriter* writer, AuxOut* aux_out);
  // Encodes a specific modular image (identified by `stream`) in the `writer`,
  // assigning bits to the provided `layer`.
  Status EncodeStream(BitWriter* writer, AuxOut* aux_out, size_t layer,
                      const ModularStreamId& stream);
  // Creates a modular image for a given DC group of VarDCT mode. `dc` is the
  // input DC image, not quantized; the group is specified by `group_index`, and
  // `nl_dc` decides whether to apply a near-lossless processing to the DC or
  // not.
  void AddVarDCTDC(const Image3F& dc, size_t group_index, bool nl_dc,
                   PassesEncoderState* enc_state, bool jpeg_transcode);
  // Creates a modular image for the AC metadata of the given group
  // (`group_index`).
  void AddACMetadata(size_t group_index, bool jpeg_transcode,
                     PassesEncoderState* enc_state);
  // Encodes a RAW quantization table in `writer`. If `modular_frame_encoder` is
  // null, the quantization table in `encoding` is used, with dimensions `size_x
  // x size_y`. Otherwise, the table with ID `idx` is encoded from the given
  // `modular_frame_encoder`.
  static void EncodeQuantTable(size_t size_x, size_t size_y, BitWriter* writer,
                               const QuantEncoding& encoding, size_t idx,
                               ModularFrameEncoder* modular_frame_encoder);
  // Stores a quantization table for future usage with `EncodeQuantTable`.
  void AddQuantTable(size_t size_x, size_t size_y,
                     const QuantEncoding& encoding, size_t idx);

  std::vector<size_t> ac_metadata_size;
  std::vector<uint8_t> extra_dc_precision;

 private:
  Status PrepareEncoding(const FrameHeader& frame_header, ThreadPool* pool,
                         EncoderHeuristics* heuristics,
                         AuxOut* aux_out = nullptr);
  Status PrepareStreamParams(const Rect& rect, const CompressParams& cparams,
                             int minShift, int maxShift,
                             const ModularStreamId& stream, bool do_color);
  std::vector<Image> stream_images_;
  std::vector<ModularOptions> stream_options_;

  Tree tree_;
  std::vector<std::vector<Token>> tree_tokens_;
  std::vector<GroupHeader> stream_headers_;
  std::vector<std::vector<Token>> tokens_;
  EntropyEncodingData code_;
  std::vector<uint8_t> context_map_;
  FrameDimensions frame_dim_;
  CompressParams cparams_;
  std::vector<size_t> tree_splits_;
  std::vector<ModularMultiplierInfo> multiplier_info_;
  std::vector<std::vector<uint32_t>> gi_channel_;
  std::vector<size_t> image_widths_;
  Predictor delta_pred_ = Predictor::Average4;
};

}  // namespace jxl

#endif  // LIB_JXL_ENC_MODULAR_H_