from __future__ import absolute_import

from django.views.decorators.csrf import csrf_exempt
from zerver.models import get_client

from zerver.decorator import asynchronous, \
    authenticated_json_post_view, internal_notify_view, RespondAsynchronously, \
    has_request_variables, REQ

from zerver.lib.response import json_success, json_error
from zerver.lib.validator import check_bool, check_list, check_string
from zerver.lib.event_queue import allocate_client_descriptor, get_client_descriptor, \
    process_notification, fetch_events
from zerver.lib.handlers import allocate_handler_id
from zerver.lib.narrow import check_supported_events_narrow_filter

import time
import ujson
import logging

from zerver.lib.rest import rest_dispatch as _rest_dispatch
rest_dispatch = csrf_exempt((lambda request, *args, **kwargs: _rest_dispatch(request, globals(), *args, **kwargs)))

@internal_notify_view
def notify(request):
    process_notification(ujson.loads(request.POST['data']))
    return json_success()

@has_request_variables
def cleanup_event_queue(request, user_profile, queue_id=REQ()):
    client = get_client_descriptor(queue_id)
    if client is None:
        return json_error("Bad event queue id: %s" % (queue_id,))
    if user_profile.id != client.user_profile_id:
        return json_error("You are not authorized to access this queue")
    request._log_data['extra'] = "[%s]" % (queue_id,)
    client.cleanup()
    return json_success()

@authenticated_json_post_view
def json_get_events(request, user_profile):
    return get_events_backend(request, user_profile, apply_markdown=True)

@asynchronous
@has_request_variables
def get_events_backend(request, user_profile, handler,
                       user_client = REQ(converter=get_client, default=None),
                       last_event_id = REQ(converter=int, default=None),
                       queue_id = REQ(default=None),
                       apply_markdown = REQ(default=False, validator=check_bool),
                       all_public_streams = REQ(default=False, validator=check_bool),
                       event_types = REQ(default=None, validator=check_list(check_string)),
                       dont_block = REQ(default=False, validator=check_bool),
                       narrow = REQ(default=[], validator=check_list(None)),
                       lifespan_secs = REQ(default=0, converter=int)):
    if user_client is None:
        user_client = request.client

    events_query = dict(
        user_profile_id = user_profile.id,
        user_profile_email = user_profile.email,
        queue_id = queue_id,
        last_event_id = last_event_id,
        event_types = event_types,
        client_type_name = user_client.name,
        all_public_streams = all_public_streams,
        lifespan_secs = lifespan_secs,
        narrow = narrow,
        dont_block = dont_block,
        handler_id = handler.handler_id)

    if queue_id is None:
        events_query['new_queue_data'] = dict(
            user_profile_id = user_profile.id,
            realm_id = user_profile.realm.id,
            user_profile_email = user_profile.email,
            event_types = event_types,
            client_type_name = user_client.name,
            apply_markdown = apply_markdown,
            all_public_streams = all_public_streams,
            queue_timeout = lifespan_secs,
            last_connection_time = time.time(),
            narrow = narrow)

    result = fetch_events(events_query)
    if "extra_log_data" in result:
        request._log_data['extra'] = result["extra_log_data"]

    if result["type"] == "async":
        handler._request = request
        return RespondAsynchronously
    if result["type"] == "error":
        return json_error(result["message"])
    return json_success(result["response"])