from __future__ import unicode_literals

from flask_dance.consumer import OAuth2ConsumerBlueprint
from functools import partial
from flask.globals import LocalProxy, _lookup_app_object
try:
    from flask import _app_ctx_stack as stack
except ImportError:
    from flask import _request_ctx_stack as stack


__maintainer__ = "David Baumgold <david@davidbaumgold.com>"


def make_dropbox_blueprint(
        app_key=None, app_secret=None, scope=None,
        force_reapprove=False, disable_signup=False,
        redirect_url=None,
        redirect_to=None, login_url=None, authorized_url=None,
        session_class=None, backend=None):
    """
    Make a blueprint for authenticating with Dropbox using OAuth 2. This requires
    a client ID and client secret from Dropbox. You should either pass them to
    this constructor, or make sure that your Flask application config defines
    them, using the variables DROPBOX_OAUTH_APP_KEY and DROPBOX_OAUTH_APP_SECRET.

    Args:
        app_key (str): The client ID for your application on Dropbox.
        app_secret (str): The client secret for your application on Dropbox
        scope (str, optional): comma-separated list of scopes for the OAuth token
        redirect_url (str): the URL to redirect to after the authentication
            dance is complete
        redirect_to (str): if ``redirect_url`` is not defined, the name of the
            view to redirect to after the authentication dance is complete.
            The actual URL will be determined by :func:`flask.url_for`
        login_url (str, optional): the URL path for the ``login`` view.
            Defaults to ``/meetup``
        authorized_url (str, optional): the URL path for the ``authorized`` view.
            Defaults to ``/meetup/authorized``.
        session_class (class, optional): The class to use for creating a
            Requests session. Defaults to
            :class:`~flask_dance.consumer.requests.OAuth2Session`.
        backend: A storage backend class, or an instance of a storage
                backend class, to use for this blueprint. Defaults to
                :class:`~flask_dance.consumer.backend.session.SessionBackend`.

    :rtype: :class:`~flask_dance.consumer.OAuth2ConsumerBlueprint`
    :returns: A :ref:`blueprint <flask:blueprints>` to attach to your Flask app.
    """
    authorization_url_params = {}
    if force_reapprove:
        authorization_url_params["force_reapprove"] = "true"
    if disable_signup:
        authorization_url_params["disable_signup"] = "true"

    dropbox_bp = OAuth2ConsumerBlueprint("dropbox", __name__,
        client_id=app_key,
        client_secret=app_secret,
        scope=scope,
        base_url="https://api.dropbox.com/1/",
        authorization_url="https://www.dropbox.com/1/oauth2/authorize",
        token_url="https://api.dropbox.com/1/oauth2/token",
        redirect_url=redirect_url,
        redirect_to=redirect_to,
        login_url=login_url,
        authorized_url=authorized_url,
        authorization_url_params=authorization_url_params,
        session_class=session_class,
        backend=backend,
    )
    dropbox_bp.from_config["client_id"] = "DROPBOX_OAUTH_APP_KEY"
    dropbox_bp.from_config["client_secret"] = "DROPBOX_OAUTH_APP_SECRET"

    @dropbox_bp.before_app_request
    def set_applocal_session():
        ctx = stack.top
        ctx.dropbox_oauth = dropbox_bp.session

    return dropbox_bp

dropbox = LocalProxy(partial(_lookup_app_object, "dropbox_oauth"))
