#!/usr/bin/env python3
# Copyright 2023 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import os
import re
import sys
from typing import Union

_THIS_DIR = os.path.abspath(os.path.dirname(__file__))
# The repo's root directory.
_ROOT_DIR = os.path.abspath(os.path.join(_THIS_DIR, "..", "..", ".."))

# Add the repo's root directory for clearer imports.
sys.path.insert(0, _ROOT_DIR)

import metadata.fields.types as field_types
import metadata.fields.util as util
import metadata.validation_result as vr

_PATTERN_DATE = re.compile(r"^\d{4}-(0|1)\d-[0-3]\d$")


class DateField(field_types.MetadataField):
  """Custom field for the date when the package was updated."""
  def __init__(self):
    super().__init__(name="Date", one_liner=True)

  def validate(self, value: str) -> Union[vr.ValidationResult, None]:
    """Checks the given value is a YYYY-MM-DD date."""
    if util.matches(_PATTERN_DATE, value):
      return None

    return vr.ValidationError(
        f"{self._name} is '{value}' - must use format YYYY-MM-DD.")