# Lint as: python3
# Copyright 2020 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# pylint: disable=missing-docstring

import argparse
import os
import re
import subprocess
from typing import Sequence

BAZEL_FILTERS = [
    r'Loading: [0-9]+ packages loaded',
    r'.*Using python binary from PYTHON_BIN = .*'
]


def create_markdown_table(rows: Sequence[Sequence[str]]):
  """Converts a 2D array to a Markdown table."""
  return '\n'.join([' | '.join(row) for row in rows])


def check_and_get_output(command: Sequence[str],
                         dry_run: bool = False,
                         log_stderr: bool = True,
                         stderr_filters: Sequence[str] = ()):
  print(f'Running: `{" ".join(command)}`')
  if dry_run:
    return None, None
  process = subprocess.Popen(command,
                             bufsize=1,
                             stderr=subprocess.PIPE,
                             stdout=subprocess.PIPE,
                             universal_newlines=True)
  process.wait()
  stdout = [line.strip(os.linesep) for line in process.stdout]
  stderr = [line.strip(os.linesep) for line in process.stderr]

  if log_stderr:
    for line in stderr:
      if not any(re.match(pattern, line) for pattern in stderr_filters):
        print(line)

  if process.returncode != 0:
    raise subprocess.CalledProcessError(process.returncode, ' '.join(command))

  return stdout, stderr


def get_test_targets(test_suite_path: str):
  """Returns a list of test targets for the given test suite."""
  # Check if the suite exists (which may not be true for failing suites).
  # We use two queries here because the return code for a failed query is
  # unfortunately the same as the return code for a bazel configuration error.
  target_dir = test_suite_path.split(':')[0]
  query = ['bazel', 'query', f'{target_dir}/...']
  targets, _ = check_and_get_output(query, stderr_filters=BAZEL_FILTERS)
  if test_suite_path not in targets:
    return []

  query = ['bazel', 'query', f'tests({test_suite_path})']
  tests, _ = check_and_get_output(query, stderr_filters=BAZEL_FILTERS)
  return tests