// 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.

#include "lib/jxl/modular/modular_image.h"

#include <jxl/memory_manager.h>

#include <cstddef>

#include <utility>

#include "lib/jxl/base/data_parallel.h"

#include "lib/jxl/image.h"

#if JXL_DEBUG_V_LEVEL >= 1

#include <sstream>

#endif

#include "lib/jxl/base/status.h"

#include "lib/jxl/image_ops.h"

#include "lib/jxl/modular/transform/transform.h"

namespace jxl {

StatusOr<Channel> Channel::Create(JxlMemoryManager *memory_manager, size_t iw,

                                  size_t ih, int hsh, int vsh) {

  JXL_ASSIGN_OR_RETURN(Plane<pixel_type> plane,

                       Plane<pixel_type>::Create(memory_manager, iw, ih));

  return Channel(std::move(plane), iw, ih, hsh, vsh);

}

void Image::undo_transforms(const weighted::Header &wp_header,

                            jxl::ThreadPool *pool) {

  while (!transform.empty()) {

    Transform t = transform.back();

    JXL_DEBUG_V(4, "Undoing transform");

    Status result = t.Inverse(*this, wp_header, pool);

    if (result == false) {

      JXL_NOTIFY_ERROR("Error while undoing transform.");

      error = true;

      return;

    }

    JXL_DEBUG_V(8, "Undoing transform: done");

    transform.pop_back();

  }

}

Image::Image(JxlMemoryManager *memory_manager, size_t iw, size_t ih,

             int bitdepth)

    : w(iw),

      h(ih),

      bitdepth(bitdepth),

      nb_meta_channels(0),

      error(false),

      memory_manager_(memory_manager) {}

StatusOr<Image> Image::Create(JxlMemoryManager *memory_manager, size_t iw,

                              size_t ih, int bitdepth, int nb_chans) {

  Image result(memory_manager, iw, ih, bitdepth);

  for (int i = 0; i < nb_chans; i++) {

    JXL_ASSIGN_OR_RETURN(Channel c, Channel::Create(memory_manager, iw, ih));

    result.channel.emplace_back(std::move(c));

  }

  return result;

}

Image::Image(JxlMemoryManager *memory_manager)

    : w(0),

      h(0),

      bitdepth(8),

      nb_meta_channels(0),

      error(true),

      memory_manager_(memory_manager) {}

Image &Image::operator=(Image &&other) noexcept {

  w = other.w;

  h = other.h;

  bitdepth = other.bitdepth;

  nb_meta_channels = other.nb_meta_channels;

  error = other.error;

  channel = std::move(other.channel);

  transform = std::move(other.transform);

  return *this;

}

StatusOr<Image> Image::Clone(const Image &that) {

  JxlMemoryManager *memory_manager = that.memory_manager();

  Image clone(memory_manager, that.w, that.h, that.bitdepth);

  clone.nb_meta_channels = that.nb_meta_channels;

  clone.error = that.error;

  clone.transform = that.transform;

  for (const Channel &ch : that.channel) {

    JXL_ASSIGN_OR_RETURN(Channel a, Channel::Create(memory_manager, ch.w, ch.h,

                                                    ch.hshift, ch.vshift));

    JXL_RETURN_IF_ERROR(CopyImageTo(ch.plane, &a.plane));

    clone.channel.push_back(std::move(a));

  }

  return clone;

}

#if JXL_DEBUG_V_LEVEL >= 1

std::string Image::DebugString() const {

  std::ostringstream os;

  os << w << "x" << h << ", depth: " << bitdepth;

  if (!channel.empty()) {

    os << ", channels:";

    for (size_t i = 0; i < channel.size(); ++i) {

      os << " " << channel[i].w << "x" << channel[i].h

         << "(shift: " << channel[i].hshift << "," << channel[i].vshift << ")";

      if (i < nb_meta_channels) os << "*";

    }

  }

  return os.str();

}

#endif

}  // namespace jxl