import pytest
from cpl.core.utils import String


def test_to_camel_case():
    assert String.to_camel_case("hello world") == "helloWorld"
    assert String.to_camel_case("hello-world") == "helloWorld"
    assert String.to_camel_case("hello_world") == "helloWorld"
    assert String.to_camel_case("HelloWorld") == "helloWorld"
    assert String.to_camel_case("hello  world") == "helloWorld"
    assert String.to_camel_case("") == ""
    assert String.to_camel_case("   ") == ""
    assert String.to_camel_case("123-abc") == "123Abc"


def test_to_pascal_case():
    assert String.to_pascal_case("hello world") == "HelloWorld"
    assert String.to_pascal_case("hello-world") == "HelloWorld"
    assert String.to_pascal_case("hello_world") == "HelloWorld"
    assert String.to_pascal_case("helloWorld") == "HelloWorld"
    assert String.to_pascal_case("") == ""
    assert String.to_pascal_case("   ") == ""
    assert String.to_pascal_case("123-abc") == "123Abc"


def test_to_snake_case():
    assert String.to_snake_case("HelloWorld") == "hello_world"
    assert String.to_snake_case("helloWorld") == "hello_world"
    assert String.to_snake_case("hello-world") == "hello_world"
    assert String.to_snake_case("hello_world") == "hello_world"
    assert String.to_snake_case("hello world") == "hello_world"
    assert String.to_snake_case("ABC123") == "abc123"


def test_first_to_upper():
    assert String.first_to_upper("hello") == "Hello"
    assert String.first_to_upper("Hello") == "Hello"
    assert String.first_to_upper("") == ""
    assert String.first_to_upper("a") == "A"
    assert String.first_to_upper("123abc") == "123abc"


def test_first_to_lower():
    assert String.first_to_lower("Hello") == "hello"
    assert String.first_to_lower("hello") == "hello"
    assert String.first_to_lower("") == ""
    assert String.first_to_lower("A") == "a"
    assert String.first_to_lower("123ABC") == "123ABC"


def test_random_length():
    random_str = String.random(10)
    assert len(random_str) == 10


def test_random_only_letters():
    random_str = String.random(20, letters=True, digits=False, special_characters=False)
    assert all(c.isalpha() for c in random_str)


def test_random_only_digits():
    random_str = String.random(20, letters=False, digits=True, special_characters=False)
    assert all(c.isdigit() for c in random_str)


def test_random_letters_and_digits():
    random_str = String.random(20, letters=True, digits=True, special_characters=False)
    assert all(c.isalnum() for c in random_str)


def test_random_no_characters():
    with pytest.raises(Exception):
        String.random(10, letters=False, digits=False, special_characters=False)