# -*- coding: utf-8 -*-
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"""A checker tool to make sure if the binary size is too huge.

Usage:
  % python binary_size_checker.py --target_directory=out_linux/Debug
"""

from __future__ import absolute_import
from __future__ import print_function

import logging
import optparse
import os
import sys


# The expected maximum size of each package and binary.  Each size is
# in Megabytes.
EXPECTED_MAXIMUM_SIZES = {
    # Distribution package files:
    'GoogleJapaneseInput.dmg': 70,
    'GoogleJapaneseInput32.msi': 65,
    'GoogleJapaneseInput64.msi': 65,
    }


def CheckFileSize(filename):
  """Check the size of filename.

  Args:
    filename: the file name to be scanned.

  Returns:
    True is returned when filename is not target or does not exceed the limit.
  """
  basename = os.path.basename(filename)
  if basename not in EXPECTED_MAXIMUM_SIZES:
    return True

  actual_size = os.stat(filename).st_size
  expected_size = EXPECTED_MAXIMUM_SIZES[basename]
  if actual_size < expected_size * 1024 * 1024:
    print('Pass: %s (size: %d) is smaller than expected (%d MB)' % (
        filename, actual_size, expected_size))
    return True
  else:
    print('WARNING: %s (size: %d) is larger than expected (%d MB)' % (
        filename, actual_size, expected_size))
    return False


def ScanAndCheckSize(directory):
  """Scan the specified directory and check the binary/package size.

  Args:
    directory: the directory file name to be scanned.

  Returns:
    True is returned when all criteria is passed.
  """
  result = True
  for filename in os.listdir(directory):
    result &= CheckFileSize(os.path.join(directory, filename))
  return result


def ParseOptions():
  """Parse command line options.

  Returns:
    The options data passed.
  """
  parser = optparse.OptionParser()
  parser.add_option('--target_directory', dest='target_directory',
                    help='The directory which will contain target binaries '
                    'and packages.')
  parser.add_option('--target_filename', dest='target_filename',
                    help='The target filenames (comma separated).')
  (options, unused_args) = parser.parse_args()
  return options


def main():
  """The main function."""
  options = ParseOptions()
  if not (options.target_directory or options.target_filename):
    logging.error('--target_directory or --target_filename is not specified.')
    sys.exit(-1)

  if options.target_directory:
    if not ScanAndCheckSize(options.target_directory):
      logging.error('Files in target_directory exceeds the limit.')
      sys.exit(-1)
  if options.target_filename:
    for filename in options.target_filename.split(','):
      if not CheckFileSize(filename):
        logging.error('The target_filename exceeds the limit.')
        sys.exit(-1)


if __name__ == '__main__':
  main()
