import os

command_eq = "dpkg --compare-versions '{}' eq '{}'"
command_gt = "dpkg --compare-versions '{}' gt '{}'"

def debian_compare(a, b):
    if os.system(command_eq.format(a, b)) == 0:
        return 0
    is_gt = os.system(command_gt.format(a, b))
    if is_gt == 0:
        return 1
    return -1

def get_debian_version_triplet(version):
  # returns epoch, upstream, debian-revision tuple
  epoch, upstream, debian_revision = '', version, ''
  if '-' in version:
    debian_revision = version.split('-')[-1]
    upstream = upstream.rsplit('-' + debian_revision)
  if ':' in version:
    epoch = version.split(':')[0]
    upstream = upstream.lsplit(epoch + ':')
  return epoch, upstream, debian_revision  

def naive_version_compare(a, b, pr=False):
  versions1 = [int(v) for v in a.split(".")]
  versions2 = [int(v) for v in b.split(".")]
  for i in range(max(len(versions1),len(versions2))):
    v1 = versions1[i] if i < len(a) else 0
    v2 = versions2[i] if i < len(b) else 0
    if v1 > v2:
      return 1
    elif v1 < v2:
      return -1
  return 0


if __name__ == '__main__':
    # assert debian_compare('3.8.6-1', '3.8.5') == 1
    # assert debian_compare('3.8.5', '3.8.5') == 0
    # assert debian_compare('3.8.5', '3.8.6-1') == -1
    # print(get_debian_version_triplet('2.31.0+dfsg-1'))
    print(naive_version_compare('3.8.6', '10.8.5'))