#!/usr/bin/python

import multiprocessing
import os
import sys
import shutil

def PrintUsage():
  print """
Usage:
  extract_features.py --filelist <file>
OR
  extract_features.py --dir <directory>
"""
  exit(1)

def GetJSFilesInDir(d):
  for root, _, files in os.walk(d):
    for f in files:
      fname = os.path.join(root, f)
      if fname.endswith('.js'):
        yield fname


TMP_DIR = ""

def ExtractFeaturesForFile(f):
  global TMP_DIR
  os.system("nodejs bin/js_features.js --skip_minified '%s' >> %s/%d" % (f, TMP_DIR, os.getpid()))

def ExtractFeaturesForFileList(files):
  global TMP_DIR
  TMP_DIR = "/tmp/feature_extractor%d" % (os.getpid())
  if os.path.exists(TMP_DIR):
    shutil.rmtree(TMP_DIR)
  os.makedirs(TMP_DIR)
  try:
    p = multiprocessing.Pool(multiprocessing.cpu_count())
    p.map(ExtractFeaturesForFile, files)
    output_files = os.listdir(TMP_DIR)
    for f in output_files:
      os.system("cat %s/%s" % (TMP_DIR, f))
  finally:
    shutil.rmtree(TMP_DIR)


if __name__ == '__main__':
  if (len(sys.argv) <= 1):
    PrintUsage()

  # Process command line arguments
  if (sys.argv[1] == "--filelist"):
    files = open(sys.argv[2], 'r').read().split('\n')
  elif (sys.argv[1] == "--dir"):
    files = [f for f in GetJSFilesInDir(sys.argv[2])]
  else:
    PrintUsage()
  # Remove files that say they are minified.
  files = [f for f in files if not f.endswith('.min.js')]
  ExtractFeaturesForFileList(files)