# Copyright 2020 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""IO-related helper functions."""

import json
import pathlib

from typing import Any, Dict

from google.protobuf import json_format
from google.protobuf.message import Message

from chromiumos.config.payload import config_bundle_pb2
from chromiumos.config.payload import flat_config_pb2


def write_message_json(
    message: Message,
    path: pathlib.Path,
    default_fields=False,
    use_integers_for_enums=False,
):
  """Take a Message and write it to a file as json.

  Args:
    message: protobuf message to write to file
    path: output file write json to
    default_fields: If true, include default values for fields
    use_integers_for_enums: If true, print integers instead of enum names.
  """
  with open(path, 'w', encoding='utf-8') as outfile:
    outfile.write(
        json_format.MessageToJson(
            message,
            including_default_value_fields=default_fields,
            sort_keys=True,
            use_integers_for_enums=use_integers_for_enums,
        ))


def write_message_binary(message: Message, path: pathlib.Path):
  """Write a Message to a file as binary wire format.

  Args:
    message: protobuf message to write to file
    path: output file write to
  """
  with open(path, 'wb') as outfile:
    outfile.write(message.SerializeToString())


def read_json_proto(message, path):
  """Read a jsonproto encoded message from a file.

  Args:
    message: an instance of the protobuffer message to read into
    path (str): path to the json encoded message on disk.

  Returns:
    reference to message
  """

  with open(path, 'r', encoding='utf-8') as f:
    json_format.Parse(f.read(), message)
  return message


def read_config(path: str) -> config_bundle_pb2.ConfigBundle:
  """Reads a ConfigBundle message from a jsonpb file.

  Args:
    path: Path to the json proto.

  Returns:
    ConfigBundle parsed from file.
  """
  return read_json_proto(
      config_bundle_pb2.ConfigBundle(),
      path,
  )


def read_flat_config(path: str) -> flat_config_pb2.FlatConfigList:
  """Reads a FlatConfigList message from a jsonpb file.

  Args:
    path: Path to the json proto.

  Returns:
    FlatConfigList parsed from file.
  """
  return read_json_proto(
      flat_config_pb2.FlatConfigList(),
      path,
  )


def read_model_sku_json(factory_dir: pathlib.Path) -> Dict[str, Any]:
  """Reads and parses the model_sku.json file.

  Args:
    factory_dir: Path to a project's factory dir.

  Returns:
    Parsed model_sku.json as a dict
  """
  with open(
      factory_dir.joinpath('generated', 'model_sku.json'),
      encoding='utf-8') as f:
    return json.load(f)