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#ifndef THIRD_PARTY_NUCLEUS_IO_FASTQ_WRITER_H_
#define THIRD_PARTY_NUCLEUS_IO_FASTQ_WRITER_H_

#include <memory>
#include <string>

#include "third_party/nucleus/io/text_writer.h"
#include "third_party/nucleus/platform/types.h"
#include "third_party/nucleus/protos/fastq.pb.h"
#include "third_party/nucleus/util/proto_ptr.h"
#include "third_party/nucleus/core/status.h"
#include "third_party/nucleus/core/statusor.h"

namespace nucleus {

// A FASTQ writer, allowing us to write FASTQ files.
//
// FASTQ files store information about a biological sequence and its
// corresponding quality scores.
//
// https://en.wikipedia.org/wiki/FASTQ_format
class FastqWriter {
 public:
  // Creates a new FastqWriter writing to the file at fastq_path, which is
  // opened and created if needed. Returns either a unique_ptr to the
  // FastqWriter or a Status indicating why an error occurred.
  static StatusOr<std::unique_ptr<FastqWriter>> ToFile(
      const string& fastq_path,
      const nucleus::genomics::v1::FastqWriterOptions& options);

  ~FastqWriter();

  // Disable copy and assignment operations.
  FastqWriter(const FastqWriter& other) = delete;
  FastqWriter& operator=(const FastqWriter&) = delete;

  // Write a FastqRecord to the FASTQ file.
  // Returns Status::OK() if the write was successful; otherwise the status
  // provides information about what error occurred.
  ::nucleus::Status Write(const nucleus::genomics::v1::FastqRecord& record);
  ::nucleus::Status WritePython(
      const ConstProtoPtr<const nucleus::genomics::v1::FastqRecord>& wrapped) {
    return Write(*(wrapped.p_));
  }

  // Close the underlying resource descriptors. Returns Status::OK() if the
  // close was successful; otherwise the status provides information about what
  // error occurred.
  ::nucleus::Status Close();

  // This no-op function is needed only for Python context manager support.  Do
  // not use it!
  void PythonEnter() const {}

 private:
  // Private constructor; use ToFile to safely create a FastqWriter.
  FastqWriter(std::unique_ptr<TextWriter> text_writer,
              const nucleus::genomics::v1::FastqWriterOptions& options);

  // Our options that control the behavior of this class.
  const nucleus::genomics::v1::FastqWriterOptions options_;

  // Underlying file writer.
  std::unique_ptr<TextWriter> text_writer_;
};

}  // namespace nucleus

#endif  // THIRD_PARTY_NUCLEUS_IO_FASTQ_WRITER_H_