import random
import requests

def get_image(boards):
    """
    get_image(boards)

    Returns a URL to an image on reddit from a random board in the boards list
    as long as it is hosted on one of the domains in the domains list
    """

    if isinstance(boards, list):
        boards = random.choice(boards)

    domains = [
        'cdn.awwni.m',
        'gfycat.com',
        'i.imgur.com',
        'i.redd.it',
        'i.reddituploads.com',
        'imgur.com',
        'media.giphy.com',
        'my.mixtape.moe',
    ]

    response = requests.get(
        "https://reddit.com/r/{}.json?limit=500".format(boards),
        headers = {'User-agent':'discord dragon-bot'}
    ).json()['data']['children']

    image_urls = list(filter(lambda x: x['data']['domain'] in domains, response))
    return random.choice(image_urls)['data']['url'].replace('http://', 'https://')