#!/usr/bin/env vpython3

# Copyright 2024 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
""" The module to create and manage measures using in the process. """

import json
import os

from google.protobuf import any_pb2
from google.protobuf.json_format import MessageToDict

from average import Average
from count import Count
from data_points import DataPoints
from measure import Measure
from metric import Metric
from time_consumption import TimeConsumption

# This is used as the key when being uploaded to ResultDB via result_sink
# and shouldn't be changed
TEST_SCRIPT_METRICS_KEY = 'test_script_metrics'

# The file name is used as the key when being loaded into the ResultDB and
# shouldn't be changed.
TEST_SCRIPT_METRICS_JSONPB_FILENAME = f'{TEST_SCRIPT_METRICS_KEY}.jsonpb'

_metric = Metric()


def _create_name(*name_pieces: str) -> str:
  if len(name_pieces) == 0:
    raise ValueError('Need at least one name piece.')
  return '/'.join(list(name_pieces))


def _register(m: Measure) -> Measure:
  _metric.register(m)
  return m


def average(*name_pieces: str) -> Average:
  return _register(Average(_create_name(*name_pieces)))


def count(*name_pieces: str) -> Count:
  return _register(Count(_create_name(*name_pieces)))


def data_points(*name_pieces: str) -> DataPoints:
  return _register(DataPoints(_create_name(*name_pieces)))


def time_consumption(*name_pieces: str) -> TimeConsumption:
  return _register(TimeConsumption(_create_name(*name_pieces)))


def tag(*args: str) -> None:
  """Adds a tag to the Metric to tag the final results; see Metric for details.
  """
  _metric.tag(*args)


def clear() -> None:
  """Clears all the registered Measures."""
  _metric.clear()


def size() -> int:
  """Gets the current size of registered Measures."""
  return _metric.size()

def to_dict() -> dict:
  """Converts all the registered Measures to a dict.

  The records are wrapped in protobuf Any message before exported as dict
  so that an additional key "@type" is included.
  """
  any_msg = any_pb2.Any()
  any_msg.Pack(_metric.dump())
  return MessageToDict(any_msg, preserving_proto_field_name=True)


def to_json() -> str:
  """Converts all the registered Measures to a json str."""
  return json.dumps(to_dict(), sort_keys=True, indent=2)

# TODO(crbug.com/343242386): May need to implement a lock and reset logic to
# clear in-memory data and lock the instance to block further operations and
# avoid accidentally accumulating data which won't be published at all.
def dump(dir_path: str) -> None:
  """Dumps the metric data into test_script_metrics.jsonpb in the |path|."""
  os.makedirs(dir_path, exist_ok=True)
  with open(os.path.join(dir_path, TEST_SCRIPT_METRICS_JSONPB_FILENAME),
            'w',
            encoding='utf-8') as wf:
    wf.write(to_json())