#!/usr/bin/env run.sh
"""
Test that bild can build Python stuff.

Example Python file that also serves as a test case for bild.
"""

# : out example
# : dep cryptography
import cryptography.fernet
import Omni.App as App
import Omni.Log as Log
import Omni.Test as Test
import sys

log = Log.setup()


def cryptic_hello(name: str) -> str:
    """
    Encrypt and decrypt `name`.

    Example taken from `cryptography` docs.

    Raises:
        ValueError: if decryption fails
    """
    key = cryptography.fernet.Fernet.generate_key()
    f = cryptography.fernet.Fernet(key)
    token = f.encrypt(hello(name).encode("utf-8"))
    log.info("attempting decryption")
    ret = f.decrypt(token).decode("utf-8")
    if ret != hello(name):
        msg = "en/decryption failed!"
        raise ValueError(msg)
    return ret


def hello(name: str) -> str:
    """Say hello."""
    return f"Hello {name}"


class TestExample(Test.TestCase):
    """Test the Example module."""

    def test_hello(self) -> None:
        """Test `hello` function."""
        self.assertEqual("Hello Ben", hello("Ben"))


def main() -> None:
    """Entrypoint."""
    if "test" in sys.argv:
        Test.run(App.Area.Test, [TestExample])
    sys.stdout.write(cryptic_hello("world"))