# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

from __future__ import absolute_import, print_function

import socket

from functools import wraps


def _find_marionette_in_args(*args, **kwargs):
    try:
        m = [a for a in args + tuple(kwargs.values()) if hasattr(a, 'session')][0]
    except IndexError:
        print("Can only apply decorator to function using a marionette object")
        raise
    return m


def do_process_check(func):
    """Decorator which checks the process status after the function has run."""
    @wraps(func)
    def _(*args, **kwargs):
        try:
            return func(*args, **kwargs)
        except (socket.error, socket.timeout):
            m = _find_marionette_in_args(*args, **kwargs)

            # In case of socket failures which will also include crashes of the
            # application, make sure to handle those correctly. In case of an
            # active shutdown just let it bubble up.
            if m.is_shutting_down:
                raise

            m._handle_socket_failure()

    return _


def uses_marionette(func):
    """Decorator which creates a marionette session and deletes it
    afterwards if one doesn't already exist.
    """
    @wraps(func)
    def _(*args, **kwargs):
        m = _find_marionette_in_args(*args, **kwargs)
        delete_session = False
        if not m.session:
            delete_session = True
            m.start_session()

        m.set_context(m.CONTEXT_CHROME)
        ret = func(*args, **kwargs)

        if delete_session:
            m.delete_session()

        return ret
    return _


def using_context(context):
    """Decorator which allows a function to execute in certain scope
    using marionette.using_context functionality and returns to old
    scope once the function exits.
    :param context: Either 'chrome' or 'content'.
    """
    def wrap(func):
        @wraps(func)
        def inner(*args, **kwargs):
            m = _find_marionette_in_args(*args, **kwargs)
            with m.using_context(context):
                return func(*args, **kwargs)

        return inner
    return wrap
