"""Config.

Contains essential constants for project functioning.
"""

import os

import requests


LOOKER_MAIN_INSTANCE_CLIENT_ID =\
    os.environ.get('LOOKER_MAIN_INSTANCE_CLIENT_ID')

LOOKER_MAIN_INSTANCE_CLIENT_SECRET =\
    os.environ.get('LOOKER_MAIN_INSTANCE_CLIENT_SECRET')

LOOKER_MAIN_INSTANCE_URL = 'https://theorchard.looker.com:19999/api/3.1'

LOOKER_CLIENT_INSTANCE_CLIENT_ID =\
    os.environ.get('LOOKER_CLIENT_INSTANCE_CLIENT_ID')

LOOKER_CLIENT_INSTANCE_CLIENT_SECRET =\
    os.environ.get('LOOKER_CLIENT_INSTANCE_CLIENT_SECRET')

LOOKER_CLIENT_INSTANCE_URL = 'https://theorchardoem.looker.com:19999/api/3.1'

# Currently set 37 as default for rolkhovskiy@theorchard.com user base folder.
# Should later be changed to a dedicated space.
CLIENT_LOOKER_SPACE_ID = 37

# Currently set 37 as default for rolkhovskiy@theorchard.com user base folder.
# Should later be changed to a dedicated space.
CLIENT_LOOKER_FOLDER_ID = 37

# Currently set 25 as default for rolkhovskiy@theorchard.com user.
# Should later be changed to an id of a special user for syncing.
CLIENT_LOOKER_USER_ID = 25


def get_api3_key(client_id, client_secret, instance):
    """Get an access token fro provided credentials on a given instance."""
    credentials = {
        'client_id': client_id,
        'client_secret': client_secret
    }

    url = f'{instance}/login'

    auth = requests.post(url, params=credentials)

    return auth.json()['access_token']


LOOKER_MAIN_AUTH_TOKEN = get_api3_key(
    LOOKER_MAIN_INSTANCE_CLIENT_ID,
    LOOKER_MAIN_INSTANCE_CLIENT_SECRET,
    LOOKER_MAIN_INSTANCE_URL
)

LOOKER_CLIENT_AUTH_TOKEN = get_api3_key(
    LOOKER_CLIENT_INSTANCE_CLIENT_ID,
    LOOKER_CLIENT_INSTANCE_CLIENT_SECRET,
    LOOKER_CLIENT_INSTANCE_URL
)

LOOKER_MAIN_VALIDATION =\
    {'Authorization': f'token {LOOKER_MAIN_AUTH_TOKEN}'}

LOOKER_CLIENT_VALIDATION =\
    {'Authorization': f'token {LOOKER_CLIENT_AUTH_TOKEN}'}

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


def get_validation(instance):
    """Get a correct validation for a given instance.

    Used in functions where we might need either main or client instance
    rather than either specific one.

    Args:
        instance (str): url of an instance. Should only use consts defined
        above.

    Returns:
        dict: json representation of a header needed for validation.
        bool: False if instance argument was anything except one of two
        expected ones.
    """
    if instance == LOOKER_MAIN_INSTANCE_URL:
        return LOOKER_MAIN_VALIDATION

    elif instance == LOOKER_CLIENT_INSTANCE_URL:
        return LOOKER_CLIENT_VALIDATION

    return False