import os

import requests

from django.conf import settings

GITHUB_AUTH_TOKEN = os.environ.get('GITHUB_AUTH_TOKEN')


def get_github_api_url():
    """
    Determine the API url for thie github project from the `PROJECT_ROOT`
    """
    PROJECT_ROOT = settings.PROJECT_ROOT
    project = str(PROJECT_ROOT.name).replace("_", "-")
    return "https://api.github.com/repos/docker/{}".format(project)


def create_github_session():
    if GITHUB_AUTH_TOKEN is None:
        raise ValueError("GITHUB_AUTH_TOKEN is not set.")
    s = requests.Session()
    s.headers.update({
        'Authorization': 'token {}'.format(GITHUB_AUTH_TOKEN),
        'Content-type': 'application/json',
    })
    return s