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// Class functions to be used for output by the Session class.

#ifndef MOZC_SESSION_INTERNAL_SESSION_OUTPUT_H_
#define MOZC_SESSION_INTERNAL_SESSION_OUTPUT_H_

#include <cstddef>
#include <cstdint>
#include <string>

#include "composer/composer.h"
#include "converter/segments.h"
#include "protocol/candidates.pb.h"
#include "protocol/commands.pb.h"
#include "session/internal/candidate_list.h"
#include "absl/strings/string_view.h"

namespace mozc {
namespace session {

class SessionOutput {
 public:
  SessionOutput(const SessionOutput &) = delete;
  SessionOutput &operator=(const SessionOutput &) = delete;

  // Fill the Candidates_Candidate protobuf with the contents of candidate.
  static void FillCandidate(const Segment &segment, const Candidate &candidate,
                            commands::Candidates_Candidate *candidate_proto);

  // Fill the Candidates protobuf with the contents of candidate_list.
  static void FillCandidates(const Segment &segment,
                             const CandidateList &candidate_list,
                             size_t position,
                             commands::Candidates *candidates_proto);

  // Fill the CandidateList protobuf with the contents of
  // candidate_list.  Candidates in the candidate_list are flatten
  // even if the candidate_list contains sub-candidate lists.
  static void FillAllCandidateWords(
      const Segment &segment, const CandidateList &candidate_list,
      commands::Category category,
      commands::CandidateList *candidate_list_proto);

  // For debug. Fill the CandidateList protobuf with the
  // removed_candidates_for_debug in the segment.
  static void FillRemovedCandidates(
      const Segment &segment, commands::CandidateList *candidate_list_proto);

  // Check if the usages should be rendered on the current CandidateList status.
  static bool ShouldShowUsages(const Segment &segment,
                               const CandidateList &cand_list);

  // Fill the usages of Candidates protobuf with the contents of candidate_list.
  static void FillUsages(const Segment &segment, const CandidateList &cand_list,
                         commands::Candidates *candidates_proto);

  // Fill the access key of Candidates protobuf with the sequence of shortcuts.
  static void FillShortcuts(absl::string_view shortcuts,
                            commands::Candidates *candidates_proto);

  // Fill the sub_label of footer_proto.  This function should be
  // called on dev_channel and unittest.
  static void FillSubLabel(commands::Footer *footer_proto);

  // Fill the footer contents of Candidates protobuf.  If category is
  // modified, true is returned.  Otherwise false is returned.
  static bool FillFooter(commands::Category category,
                         commands::Candidates *candidates_proto);

  // Fill the Preedit protobuf with the contents of composer as a preedit.
  static void FillPreedit(const composer::Composer &composer,
                          commands::Preedit *preedit);

  // Fill the Preedit protobuf with the contents of segments as a conversion.
  static void FillConversion(const Segments &segments, size_t segment_index,
                             int candidate_id, commands::Preedit *preedit);

  enum SegmentType {
    PREEDIT = 1,
    CONVERSION = 2,
    FOCUSED = 4,
  };
  // Add a Preedit::Segment protobuf to the Preedit protobuf with key
  // and value.  Return true iff. new segment is added to preedit.
  static bool AddSegment(absl::string_view, absl::string_view value,
                         uint32_t segment_type_mask,
                         commands::Preedit *preedit);

  // Fill the Result protobuf with the key and result strings
  // for a conversion result without any text normalization.
  static void FillConversionResultWithoutNormalization(
      std::string key, std::string result, commands::Result *result_proto);

  // Fill the Result protobuf with the key and result strings
  // nomalizing the string for a conversion result.
  static void FillConversionResult(absl::string_view key, std::string result,
                                   commands::Result *result_proto);

  // Fill the Result protobuf with the preedit string nomalizing the
  // string for a preedit result.
  static void FillPreeditResult(absl::string_view preedit,
                                commands::Result *result_proto);

  // Fill the Result protobuf with cursor offset.
  static void FillCursorOffsetResult(int32_t cursor_offset,
                                     commands::Result *result_proto);
};

}  // namespace session
}  // namespace mozc

#endif  // MOZC_SESSION_INTERNAL_SESSION_OUTPUT_H_
