#!/usr/bin/env python3
import argparse
from pathlib import Path
from typing import Union
import plyvel
import json
from sys import stdout
import base64


parser = argparse.ArgumentParser()
encoding_names = ["utf8", "base16", "base32", "base64", "base85"]
parser.add_argument("--encoding", "-e", choices=encoding_names, default="utf8")
parser.add_argument("--key-encoding", choices=encoding_names, default=None)
parser.add_argument("--value-encoding", choices=encoding_names, default=None)
parser.add_argument("db_path", type=Path)
cli_args = parser.parse_args()


def bytes_to_json(b: bytes, encoding: str) -> Union[str, list[int]]:
  if encoding == "utf8":
    try:
      return b.decode("utf8")
    except UnicodeDecodeError:
      return list(b)
  elif encoding == "base16":
    return base64.b16encode(b).decode("ascii")
  elif encoding == "base32":
    return base64.b32encode(b).decode("ascii")
  elif encoding == "base64":
    return base64.b64encode(b).decode("ascii")
  elif encoding == "base85":
    return base64.b85encode(b).decode("ascii")
  else:
    assert False


key_encoding: str = cli_args.key_encoding or cli_args.encoding
value_encoding: str = cli_args.value_encoding or cli_args.encoding
db = plyvel.DB(str(cli_args.db_path), create_if_missing=False)
with db.iterator() as iterator:
  for key, value in iterator:
    json.dump(
      {
        "key": bytes_to_json(key, key_encoding),
        "value": bytes_to_json(value, value_encoding),
      },
      stdout,
    )
    stdout.write("\n")