import os


def logfile_path(jsonfmt=False, debug=False):
  """
    Returns the a logfileconf path following this rules:
      - conf/logging_debug_json.conf # jsonfmt=true,  debug=true
      - conf/logging_json.conf       # jsonfmt=true,  debug=false
      - conf/logging_debug.conf      # jsonfmt=false, debug=true
      - conf/logging.conf            # jsonfmt=false, debug=false
    Can be parametrized via envvars: JSONLOG=true, DEBUGLOG=true
  """
  _json = ""
  _debug = ""

  if jsonfmt or os.getenv('JSONLOG', 'false').lower() == 'true':
    _json = "_json"

  if debug or os.getenv('DEBUGLOG', 'false').lower() == 'true':
    _debug = "_debug"

  return 'conf/logging%s%s.conf' % (_debug, _json)


def filter_logs(values, filtered_fields):
  """
    Takes a dict and a list of keys to filter.
    eg:
     with filtered_fields:
        [{'key': ['k1', k2'], 'fn': lambda x: 'filtered'}]
     and values:
       {'k1': {'k2': 'some-secret'}, 'k3': 'some-value'}
    the returned dict is:
      {'k1': {k2: 'filtered'}, 'k3': 'some-value'}
  """
  for field in filtered_fields:
    cdict = values

    for key in field['key'][:-1]:
      if key in cdict:
        cdict = cdict[key]

    last_key = field['key'][-1]

    if last_key in cdict and cdict[last_key]:
      cdict[last_key] = field['fn'](cdict[last_key])