import unittest
import re
from pathlib import Path

# Regex:
# - one or more lowercase letters, digits or hyphens
# - optionally exactly one '_' followed by one or more lowercase letters, digits or hyphens
ROLE_NAME_PATTERN = re.compile(r'^[a-z0-9-]+(?:_[a-z0-9-]+)?$')

class TestRoleNames(unittest.TestCase):
    def test_role_names_follow_naming_convention(self):
        # go up from tests/integration/test_roles_naming.py to project root, then into roles/
        roles_dir = Path(__file__).resolve().parents[2] / "roles"
        self.assertTrue(
            roles_dir.is_dir(),
            f"'roles/' directory not found at {roles_dir}"
        )

        invalid_names = []
        for role_path in roles_dir.iterdir():
            if not role_path.is_dir():
                # skip non-directories
                continue

            name = role_path.name
            if not ROLE_NAME_PATTERN.fullmatch(name):
                invalid_names.append(name)

        self.assertFalse(
            invalid_names,
            "The following role directory names violate the naming convention "
            "(only a–z, 0–9, '-', max one '_', and '_' must be followed by at least one character):\n"
            + "\n".join(f"- {n}" for n in invalid_names)
        )

if __name__ == "__main__":
    unittest.main()