#!/usr/bin/env python
# Copyright 2017 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Runs traffic_annotation_auditor on the given change list or all files to make
sure network traffic annoations are syntactically and semantically correct and
all required functions are annotated.
"""

import os
import argparse
import sys

from annotation_tools import NetworkTrafficAnnotationTools

# If this test starts failing, please set TEST_IS_ENABLED to "False" and file a
# bug to get this reenabled, and cc the people listed in
# //tools/traffic_annotation/OWNERS.
TEST_IS_ENABLED = True

# Threshold for the change list size to trigger full test.
CHANGELIST_SIZE_TO_TRIGGER_FULL_TEST = 100


class NetworkTrafficAnnotationChecker():
  EXTENSIONS = ['.cc', '.mm',]

  def __init__(self, build_path=None):
    """Initializes a NetworkTrafficAnnotationChecker object.

    Args:
      build_path: str Absolute or relative path to a fully compiled build
          directory. If not specified, the script tries to find it based on
          relative position of this file (src/tools/traffic_annotation).
    """
    self.tools = NetworkTrafficAnnotationTools(build_path)

  def ShouldCheckFile(self, file_path):
    """Returns true if the input file has an extension relevant to network
    traffic annotations."""
    return os.path.splitext(file_path)[1] in self.EXTENSIONS

  def CheckFiles(self, complete_run, limit):
    """Passes all given files to traffic_annotation_auditor to be checked for
    possible violations of network traffic annotation rules.

    Args:
      complete_run: bool Flag requesting to run test on all relevant files.
      limit: int The upper threshold for number of errors and warnings. Use 0
          for unlimited.

    Returns:
      int Exit code of the network traffic annotation auditor.
    """
    if not self.tools.CanRunAuditor():
      print("Network traffic annotation presubmit check was not performed. A "
            "compiled build directory and traffic_annotation_auditor binary "
            "are required to do it.")
      return 0

    if complete_run:
      file_paths = []
    else:
      # Get list of modified files. If failed, silently ignore as the test is
      # run in error resilient mode.
      file_paths = self.tools.GetModifiedFiles() or []
      file_paths = [
          file_path for file_path in file_paths if self.ShouldCheckFile(
              file_path)]
      if not file_paths:
        return 0
      # If the number of changed files in the CL exceeds a threshold, trigger
      # full test to avoid sending very long list of arguments and possible
      # failure in argument buffers.
      if len(file_paths) > CHANGELIST_SIZE_TO_TRIGGER_FULL_TEST:
        file_paths = []

    args = ["--test-only", "--limit=%i" % limit, "--error-resilient"] + \
           file_paths

    stdout_text, stderr_text, return_code = self.tools.RunAuditor(args)

    if stdout_text:
      print(stdout_text)
    if stderr_text:
      print("\n[Runtime Messages]:\n%s" % stderr_text)
    return return_code


def main():
  if not TEST_IS_ENABLED:
    return 0

  parser = argparse.ArgumentParser(
      description="Network Traffic Annotation Presubmit checker.")
  parser.add_argument(
      '--build-path',
      help='Specifies a compiled build directory, e.g. out/Debug. If not '
           'specified, the script tries to guess it. Will not proceed if not '
           'found.')
  parser.add_argument(
      '--limit', default=5,
      help='Limit for the maximum number of returned errors and warnings. '
           'Default value is 5, use 0 for unlimited.')
  parser.add_argument(
      '--complete', action='store_true',
      help='Run the test on the complete repository. Otherwise only the '
           'modified files are tested.')

  args = parser.parse_args()
  checker = NetworkTrafficAnnotationChecker(args.build_path)
  return checker.CheckFiles(args.complete, args.limit)


if '__main__' == __name__:
  sys.exit(main())