#!/usr/bin/env python2
"""Script to generate a list of object files.

0 represents a good object file.
1 represents a bad object file.
"""

from __future__ import print_function

import argparse
import os
import random
import sys

import common


def Main(argv):
  """Generates a list, the value of each element is 0 or 1.

  The number of 1s in the list is specified by bad_obj_num.
  The others are all 0s. The total number of 0s and 1s is specified by obj_num.

  Args:
    argv: argument from command line

  Returns:
    0 always.
  """
  parser = argparse.ArgumentParser()
  parser.add_argument(
      '-n',
      '--obj_num',
      dest='obj_num',
      default=common.DEFAULT_OBJECT_NUMBER,
      help=('Number of total objects.'))
  parser.add_argument(
      '-b',
      '--bad_obj_num',
      dest='bad_obj_num',
      default=common.DEFAULT_BAD_OBJECT_NUMBER,
      help=('Number of bad objects. Must be great than or '
            'equal to zero and less than total object '
            'number.'))
  parser.add_argument(
      '-o',
      '--obj_list',
      dest='obj_list',
      default='',
      help=('List of comma seperated objects to generate. '
            'A 0 means the object is good, a 1 means the '
            'object is bad.'))
  options = parser.parse_args(argv)

  obj_num = int(options.obj_num)
  bad_obj_num = int(options.bad_obj_num)
  bad_to_gen = int(options.bad_obj_num)
  obj_list = options.obj_list
  if not obj_list:
    obj_list = []
    for i in range(obj_num):
      if bad_to_gen > 0 and random.randint(1, obj_num) <= bad_obj_num:
        obj_list.append(1)
        bad_to_gen -= 1
      else:
        obj_list.append(0)
    while bad_to_gen > 0:
      t = random.randint(0, obj_num - 1)
      if obj_list[t] == 0:
        obj_list[t] = 1
        bad_to_gen -= 1
  else:
    obj_list = obj_list.split(',')

  if os.path.isfile(common.OBJECTS_FILE):
    os.remove(common.OBJECTS_FILE)
  if os.path.isfile(common.WORKING_SET_FILE):
    os.remove(common.WORKING_SET_FILE)

  f = open(common.OBJECTS_FILE, 'w')
  w = open(common.WORKING_SET_FILE, 'w')
  for i in obj_list:
    f.write('{0}\n'.format(i))
    w.write('{0}\n'.format(i))
  f.close()

  obj_num = len(obj_list)
  bad_obj_num = obj_list.count(1)
  print('Generated {0} object files, with {1} bad ones.'.format(
      obj_num, bad_obj_num))

  return 0


if __name__ == '__main__':
  retval = Main(sys.argv[1:])
  sys.exit(retval)