import praw
from prawcore import exceptions
import requests


def get_post_type(url):
    header = requests.head(url).headers
    if 'Content-Type' in header:
        return header['Content-Type']
    else:
        return ''


def get_reddit_instance():
    reddit_config = {}
    with open("reddit_config") as tmp_file:
        for line in tmp_file:
            (key, val) = line.split(';')
            reddit_config[key] = val.replace('\n', '')

    return praw.Reddit(
        user_agent=reddit_config['user_agent'],
        client_id=reddit_config['client_id'],
        client_secret=reddit_config['client_secret']
    )


def get_reddit_post(sub, is_image_post=False):
    reddit_instance = get_reddit_instance()

    try:
        sub = reddit_instance.subreddit(sub)
        post = sub.random()

    except exceptions.NotFound:
        return "Geile, gib gültiges Sub"
    except exceptions.Forbidden:
        return "Geile, gib freies Sub"
    except Exception as e:
        return e

    if post == None:
        return "Random geht in diesem Sub leider nicht :("

    if is_image_post:
        tries = 0
        while "image" not in get_post_type(post.url) and tries < 5:
            post = sub.random()
            tries += 1
        if tries >= 5:
            return "Geile, gib Sub mit Bildern (über 5 Fehlversuche)"

        return post.url


def wrong_dog(bot, update):
    reddit(bot, update, ['whatswrongwithyourdog'])


def hamster(bot, update):
    reddit_img(bot, update, ['hamsters'])


def reddit(bot, update, args):
    if not args:
        update.message.reply_text("Geile, sag sub")
        return

    sub = args[0]
    update.message.reply_text(get_reddit_post(sub))


def reddit_img(bot, update, args):
    if not args:
        update.message.reply_text("Geile, sag sub")
        return
    sub = args[0]
    post = get_reddit_post(sub, True)

    try:
        bot.send_photo(chat_id=update.message.chat_id, photo=post.url)
        return
    except AttributeError:
        update.message.reply_text(post)