# test_username.py

import pytest
from app.Login import UserName


def test_username_too_long():
    username = 'a' * 21
    result = UserName(username).validate()
    assert username in result
    assert 'too long' in result


def test_username_empty():
    username = ''
    result = UserName(username).validate()
    assert 'empty user name' in result


def test_username_starts_with_dot():
    username = '.startwithdot'
    result = UserName(username).validate()
    assert 'Period (.) is not allowed' in result


def test_username_contains_space():
    username = 'has space'
    result = UserName(username).validate()
    assert 'Whitespace is not allowed' in result


def test_username_contains_invalid_punctuation():
    invalid_chars = ['@', '#', '$', '!', '{', '}', '[', ']']
    for c in invalid_chars:
        username = f'bad{c}name'
        result = UserName(username).validate()
        assert f'{c} is not allowed' in result, f"Failed on char: {c}"


def test_username_uses_restricted_word():
    restricted_words = ['signup', 'login', 'logout', 'reset', 'mark', 'back',
                        'unfamiliar', 'familiar', 'del', 'admin']
    for word in restricted_words:
        result = UserName(word).validate()
        assert 'restricted word' in result, f"Failed on word: {word}"


def test_username_contains_chinese():
    username = '用户名'
    result = UserName(username).validate()
    assert 'Chinese characters are not allowed' in result


def test_valid_username():
    valid_usernames = [
        'valid_user',
        'valid.user',
        'user123',
        'A_veryValidName',
    ]
    for username in valid_usernames:
        result = UserName(username).validate()
        assert result == 'OK', f"Failed on valid username: {username}"