import argparse

from dateutil.parser import parse as parse_date

from app import app
from data import model
from data.database import ServiceKeyApprovalType
from data.model.log import log_action


def generate_key(service, name, expiration_date=None, notes=None):
  metadata = {
    'created_by': 'CLI tool',
  }

  # Generate a key with a private key that we *never save*.
  (private_key, key) = model.service_keys.generate_service_key(service, expiration_date,
                                                               metadata=metadata,
                                                               name=name)
  # Auto-approve the service key.
  model.service_keys.approve_service_key(key.kid, ServiceKeyApprovalType.AUTOMATIC, notes=notes or '')

  # Log the creation and auto-approval of the service key.
  key_log_metadata = {
    'kid': key.kid,
    'preshared': True,
    'service': service,
    'name': name,
    'expiration_date': expiration_date,
    'auto_approved': True,
  }

  log_action('service_key_create', None, metadata=key_log_metadata)
  log_action('service_key_approve', None, metadata=key_log_metadata)
  return private_key, key.kid


def valid_date(s):
  try:
    return parse_date(s)
  except ValueError:
    msg = "Not a valid date: '{0}'.".format(s)
    raise argparse.ArgumentTypeError(msg)


if __name__ == '__main__':
  parser = argparse.ArgumentParser(description='Generates a preshared key')
  parser.add_argument('service', help='The service name for which the key is being generated')
  parser.add_argument('name', help='The friendly name for the key')
  parser.add_argument('--expiration', default=None, type=valid_date,
                      help='The optional expiration date for the key')
  parser.add_argument('--notes', help='Optional notes about the key', default=None)

  args = parser.parse_args()
  generated, _ = generate_key(args.service, args.name, args.expiration, args.notes)
  print generated.exportKey('PEM')