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#include "session/output_util.h"

#include <cstdint>

#include "base/logging.h"
#include "base/port.h"
#include "protocol/candidates.pb.h"
#include "protocol/commands.pb.h"

namespace mozc {

bool OutputUtil::GetCandidateIndexById(const commands::Output &output,
                                       int32_t mozc_candidate_id,
                                       int32_t *candidate_index) {
  if (candidate_index == nullptr) {
    return false;
  }
  if (!output.has_all_candidate_words()) {
    return false;
  }
  const commands::CandidateList &list = output.all_candidate_words();
  for (size_t i = 0; i < list.candidates_size(); ++i) {
    const commands::CandidateWord &word = list.candidates(i);
    if (!word.has_id() || !word.has_index()) {
      // cannot specify this id.
      continue;
    }
    if (word.id() == mozc_candidate_id) {
      DCHECK(nullptr != candidate_index);
      *candidate_index = word.index();
      return true;
    }
  }
  return false;
}

bool OutputUtil::GetCandidateIdByIndex(const commands::Output &output,
                                       int32_t candidate_index,
                                       int32_t *mozc_candidate_id) {
  if (mozc_candidate_id == nullptr) {
    return false;
  }
  if (!output.has_all_candidate_words()) {
    return false;
  }
  const commands::CandidateList &list = output.all_candidate_words();
  for (size_t i = 0; i < list.candidates_size(); ++i) {
    const commands::CandidateWord &word = list.candidates(i);
    if (!word.has_id() || !word.has_index()) {
      // cannot specify this id.
      continue;
    }
    if (word.index() == candidate_index) {
      DCHECK(nullptr != mozc_candidate_id);
      *mozc_candidate_id = word.id();
      return true;
    }
  }
  return false;
}

bool OutputUtil::GetFocusedCandidateId(const commands::Output &output,
                                       int32_t *mozc_candidate_id) {
  if (mozc_candidate_id == nullptr) {
    return false;
  }
  if (!output.has_all_candidate_words()) {
    return false;
  }
  const commands::CandidateList &list = output.all_candidate_words();
  if (!list.has_focused_index()) {
    return false;
  }
  const int32_t focused_index = list.focused_index();
  for (size_t i = 0; i < list.candidates_size(); ++i) {
    const commands::CandidateWord &word = list.candidates(i);
    if (!word.has_id() || !word.has_index()) {
      // cannot specify this id.
      continue;
    }
    if (word.index() == focused_index) {
      DCHECK(nullptr != mozc_candidate_id);
      *mozc_candidate_id = word.id();
      return true;
    }
  }
  return false;
}

}  // namespace mozc
