#!/usr/bin/env python3

# Towncrier silently ignores files that do not match the expected ending.
# We use this script to ensure we catch these as errors in CI.

import os
import pathlib
import sys

ALLOWED_EXTENSIONS = {
    '.breaking.rst',
    '.bugfix.rst',
    '.doc.rst',
    '.feature.rst',
    '.internal.rst',
    '.misc.rst',
    '.performance.rst',
    '.removal.rst',
}

ALLOWED_FILES = {
    'validate_files.py',
    'README.md',
}

THIS_DIR = pathlib.Path(__file__).parent

num_args = len(sys.argv) - 1
assert num_args in {0, 1}
if num_args == 1:
    assert sys.argv[1] in ('is-empty', )

for fragment_file in THIS_DIR.iterdir():

    if fragment_file.name in ALLOWED_FILES:
        continue
    elif num_args == 0:
        full_extension = "".join(fragment_file.suffixes)
        if full_extension not in ALLOWED_EXTENSIONS:
            raise Exception(f"Unexpected file: {fragment_file}")
    elif sys.argv[1] == 'is-empty':
        raise Exception(f"Unexpected file: {fragment_file}")
    else:
        raise RuntimeError("Strange: arguments {sys.argv} were validated, but not found")