"""
Copyright 2024 Google LLC

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

     https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""

import argparse
import os
import re


def name_type(value, pat=re.compile(r'[a-z]([-a-z0-9]*[a-z0-9])?')):
  """Validate that the name matches the expected pattern."""
  match = pat.fullmatch(value)
  if not match or len(match.group(0)) > 40:
    raise argparse.ArgumentTypeError(
        'Name must be less than 40 characters and match the pattern'
        f' `{pat.pattern}`'
        f' Name is currently {value}'
    )
  return value


def directory_path_type(value):
  if not os.path.isdir(value):
    raise argparse.ArgumentTypeError(
        f'Directory path is invalid. User provided path was {value}'
    )
  return value
