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// Providing the string representation of POS id.

#ifndef MOZC_CONVERTER_POS_ID_PRINTER_H_
#define MOZC_CONVERTER_POS_ID_PRINTER_H_

#include <string>

#include "base/file_stream.h"
#include "absl/base/attributes.h"
#include "absl/container/flat_hash_map.h"
#include "absl/strings/string_view.h"

namespace mozc {
namespace internal {

// Example:
// PosIdPrinter pos_id_printer(InputFileStream("id.def"));
// EXPECT_EQ(pos_id_printer.IdToString(1934), "名詞,サ変接続,*,*,*,*,*");
// EXPECT_EQ(pos_id_printer.IdToString(-1),  // invalid id
//           "");
class PosIdPrinter {
 public:
  explicit PosIdPrinter(InputFileStream id_def);
  // Movable.
  PosIdPrinter(PosIdPrinter &&) = default;
  PosIdPrinter &operator=(PosIdPrinter &&) = default;

  ~PosIdPrinter() = default;

  // Returns a string_view to the POS string for the given id.
  // For an invalid id, returns empty string.
  absl::string_view IdToString(int id) const ABSL_ATTRIBUTE_LIFETIME_BOUND;

 private:
  absl::flat_hash_map<int, std::string> id_to_pos_map_;
};

}  // namespace internal
}  // namespace mozc

#endif  // MOZC_CONVERTER_POS_ID_PRINTER_H_
