#!/usr/bin/env python3
# Protocol Buffers - Google's data interchange format
# Copyright 2008 Google Inc.  All rights reserved.
#
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file or at
# https://developers.google.com/open-source/licenses/bsd

"""A conformance test implementation for the Python protobuf library.

See conformance.proto for more information.
"""

import struct
import sys
from google.protobuf import json_format
from google.protobuf import message
from google.protobuf import text_format
from google.protobuf import test_messages_proto2_pb2
from google.protobuf import test_messages_proto3_pb2
from conformance import conformance_pb2
from conformance.test_protos import test_messages_edition2023_pb2
from editions.golden import test_messages_proto2_editions_pb2
from editions.golden import test_messages_proto3_editions_pb2

test_count = 0
verbose = False


class ProtocolError(Exception):
  pass


def _create_test_message(type):
  if type == "protobuf_test_messages.proto2.TestAllTypesProto2":
    return test_messages_proto2_pb2.TestAllTypesProto2()
  if type == "protobuf_test_messages.proto3.TestAllTypesProto3":
    return test_messages_proto3_pb2.TestAllTypesProto3()
  if type == "protobuf_test_messages.editions.TestAllTypesEdition2023":
    return test_messages_edition2023_pb2.TestAllTypesEdition2023()
  if type == "protobuf_test_messages.editions.proto2.TestAllTypesProto2":
    return test_messages_proto2_editions_pb2.TestAllTypesProto2()
  if type == "protobuf_test_messages.editions.proto3.TestAllTypesProto3":
    return test_messages_proto3_editions_pb2.TestAllTypesProto3()
  return None


def do_test(request):
  response = conformance_pb2.ConformanceResponse()

  is_json = request.WhichOneof("payload") == "json_payload"
  test_message = _create_test_message(request.message_type)

  if (not is_json) and (test_message is None):
    raise ProtocolError("Protobuf request doesn't have specific payload type")

  try:
    if request.WhichOneof("payload") == "protobuf_payload":
      try:
        test_message.ParseFromString(request.protobuf_payload)
      except message.DecodeError as e:
        response.parse_error = str(e)
        return response

    elif request.WhichOneof("payload") == "json_payload":
      try:
        ignore_unknown_fields = (
            request.test_category
            == conformance_pb2.JSON_IGNORE_UNKNOWN_PARSING_TEST
        )
        json_format.Parse(
            request.json_payload, test_message, ignore_unknown_fields
        )
      except Exception as e:
        response.parse_error = str(e)
        return response

    elif request.WhichOneof("payload") == "text_payload":
      try:
        text_format.Parse(request.text_payload, test_message)
      except Exception as e:
        response.parse_error = str(e)
        return response

    else:
      raise ProtocolError("Request didn't have payload.")

    if request.requested_output_format == conformance_pb2.UNSPECIFIED:
      raise ProtocolError("Unspecified output format")

    elif request.requested_output_format == conformance_pb2.PROTOBUF:
      response.protobuf_payload = test_message.SerializeToString()

    elif request.requested_output_format == conformance_pb2.JSON:
      try:
        response.json_payload = json_format.MessageToJson(test_message)
      except Exception as e:
        response.serialize_error = str(e)
        return response

    elif request.requested_output_format == conformance_pb2.TEXT_FORMAT:
      response.text_payload = text_format.MessageToString(
          test_message, print_unknown_fields=request.print_unknown_fields
      )

  except Exception as e:
    response.runtime_error = str(e)

  return response


def do_test_io():
  length_bytes = sys.stdin.buffer.read(4)
  if len(length_bytes) == 0:
    return False  # EOF
  elif len(length_bytes) != 4:
    raise IOError("I/O error")

  length = struct.unpack("<I", length_bytes)[0]
  serialized_request = sys.stdin.buffer.read(length)
  if len(serialized_request) != length:
    raise IOError("I/O error")

  request = conformance_pb2.ConformanceRequest()
  request.ParseFromString(serialized_request)

  response = do_test(request)

  serialized_response = response.SerializeToString()
  sys.stdout.buffer.write(struct.pack("<I", len(serialized_response)))
  sys.stdout.buffer.write(serialized_response)
  sys.stdout.buffer.flush()

  if verbose:
    sys.stderr.write(
        "conformance_python: request=%s, response=%s\n"
        % (
            request.ShortDebugString().c_str(),
            response.ShortDebugString().c_str(),
        )
    )

  global test_count
  test_count += 1

  return True


while True:
  if not do_test_io():
    sys.stderr.write(
        "conformance_python: received EOF from test runner "
        + "after %s tests, exiting\n" % (test_count,)
    )
    sys.exit(0)