"""Functions for Github authorisation."""


try:
    input = raw_input
except NameError:
    pass

import requests
import getpass
import json

# Keyring stores passwords by a 'username', but we're not storing a username and
# password
fake_username = "ipython_tools"

token = None


def get_auth_token():
    global token

    if token is not None:
        return token

    import keyring

    token = keyring.get_password("github", fake_username)
    if token is not None:
        return token

    print(
        "Please enter your github username and password. These are not "
        "stored, only used to get an oAuth token. You can revoke this at "
        "any time on Github."
    )
    user = input("Username: ")
    pw = getpass.getpass("Password: ")

    auth_request = {
        "scopes": ["public_repo", "gist"],
        "note": "IPython tools",
        "note_url": "https://github.com/ipython/ipython/tree/master/tools",
    }
    response = requests.post(
        "https://api.github.com/authorizations",
        auth=(user, pw),
        data=json.dumps(auth_request),
    )
    response.raise_for_status()
    token = json.loads(response.text)["token"]
    keyring.set_password("github", fake_username, token)
    return token


def make_auth_header():
    return {"Authorization": "token " + get_auth_token()}


def post_issue_comment(project, num, body):
    url = "https://api.github.com/repos/{project}/issues/{num}/comments".format(
        project=project, num=num
    )
    payload = json.dumps({"body": body})
    requests.post(url, data=payload, headers=make_auth_header())


def post_gist(content, description="", filename="file", auth=False):
    """Post some text to a Gist, and return the URL."""
    post_data = json.dumps(
        {
            "description": description,
            "public": True,
            "files": {filename: {"content": content}},
        }
    ).encode("utf-8")

    headers = make_auth_header() if auth else {}
    response = requests.post(
        "https://api.github.com/gists", data=post_data, headers=headers
    )
    response.raise_for_status()
    response_data = json.loads(response.text)
    return response_data["html_url"]


def get_pull_request(project, num, github_api=3):
    """get pull request info  by number

    github_api : version of github api to use
    """
    if github_api == 2:
        url = "http://github.com/api/v2/json/pulls/{project}/{num}".format(
            project=project, num=num
        )
    elif github_api == 3:
        url = "https://api.github.com/repos/{project}/pulls/{num}".format(
            project=project, num=num
        )
    response = requests.get(url)
    response.raise_for_status()
    if github_api == 2:
        return json.loads(response.text)["pull"]
    return json.loads(response.text)


def get_pulls_list(project, github_api=3):
    """get pull request list

    github_api : version of github api to use
    """
    if github_api == 3:
        url = "https://api.github.com/repos/{project}/pulls".format(project=project)
    else:
        url = "http://github.com/api/v2/json/pulls/{project}".format(project=project)
    response = requests.get(url)
    response.raise_for_status()
    if github_api == 2:
        return json.loads(response.text)["pulls"]
    return json.loads(response.text)
