"""AWS Lambda Container Experiment."""

import os
import time

import cowsay


def handler(event, context):
    """Entrypoint."""
    version = os.environ.get('version', None)
    start = time.time()
    result = fibonacci(event['n'])
    runtime = time.time() - start
    char = os.environ.get('char', 'cow')
    if char not in cowsay.char_names:
        raise Exception(f'{char} not in {cowsay.char_names}')
    getattr(cowsay, char)(f'{result:,}')
    return {
        'result': result,
        'runtime': runtime,
        'version': version,
        'character': char
    }


def fibonacci(n):
    """Return fibinacci number in sequence."""
    if n <= 0:
        raise Exception(f'{n} <= 0')
    elif n == 1:
        return 0
    elif n == 2:
        return 1
    else:
        return fibonacci(n-1) + fibonacci(n-2)