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#include "dictionary/file/dictionary_file.h"

#include <string>
#include <vector>

#include "base/logging.h"
#include "base/mmap.h"
#include "dictionary/file/codec_interface.h"
#include "dictionary/file/section.h"
#include "absl/memory/memory.h"
#include "absl/strings/str_cat.h"

namespace mozc {
namespace dictionary {

DictionaryFile::DictionaryFile(const DictionaryFileCodecInterface *file_codec)
    : file_codec_(file_codec) {
  DCHECK(file_codec_);
}

DictionaryFile::~DictionaryFile() = default;

mozc::Status DictionaryFile::OpenFromFile(const std::string &file) {
  mapping_ = absl::make_unique<Mmap>();
  if (!mapping_->Open(file.c_str())) {
    return mozc::UnknownError(
        absl::StrCat("dictionary_file.cc: Failed to mmap ", file));
  }
  return OpenFromImage(mapping_->begin(), mapping_->size());
}

mozc::Status DictionaryFile::OpenFromImage(const char *image, int length) {
  sections_.clear();
  return file_codec_->ReadSections(image, length, &sections_);
}

const char *DictionaryFile::GetSection(const std::string &section_name,
                                       int *len) const {
  DCHECK(len);
  const std::string name = file_codec_->GetSectionName(section_name);
  for (const auto &section : sections_) {
    if (section.name == name) {
      *len = section.len;
      return section.ptr;
    }
  }
  return nullptr;
}

}  // namespace dictionary
}  // namespace mozc
