from __future__ import absolute_import

from django.utils.translation import ugettext as _
from django.utils import timezone
from django.http import HttpResponse, HttpRequest

from zilencer.models import Deployment, RemotePushDeviceToken, RemoteZulipServer

from zerver.decorator import has_request_variables, REQ
from zerver.lib.error_notify import do_report_error
from zerver.lib.push_notifications import send_android_push_notification, \
    send_apple_push_notification
from zerver.lib.request import JsonableError
from zerver.lib.response import json_error, json_success
from zerver.lib.validator import check_dict
from zerver.models import UserProfile, PushDeviceToken, Realm

from typing import Any, Dict, Optional, Union, Text, cast

def validate_entity(entity):
    # type: (Union[UserProfile, RemoteZulipServer]) -> None
    if not isinstance(entity, RemoteZulipServer):
        raise JsonableError(_("Must validate with valid Zulip server API key"))

def validate_bouncer_token_request(entity, token):
    # type: (Union[UserProfile, RemoteZulipServer], Text) -> None
    validate_entity(entity)
    if token == '' or len(token) > 4096:
        raise JsonableError(_("Empty or invalid length token"))

@has_request_variables
def report_error(request, deployment, type=REQ(), report=REQ(validator=check_dict([]))):
    # type: (HttpRequest, Deployment, Text, Dict[str, Any]) -> HttpResponse
    return do_report_error(deployment.name, type, report)

@has_request_variables
def remote_server_register_push(request, entity, user_id=REQ(),
                                token=REQ(), token_kind=REQ(), ios_app_id=None):
    # type: (HttpRequest, Union[UserProfile, RemoteZulipServer], int, Text, int, Optional[Text]) -> HttpResponse
    validate_bouncer_token_request(entity, token)
    server = cast(RemoteZulipServer, entity)

    # If a user logged out on a device and failed to unregister,
    # we should delete any other user associations for this token
    # & RemoteServer pair
    RemotePushDeviceToken.objects.filter(
        token=token, kind=token_kind, server=server).exclude(user_id=user_id).delete()

    # Save or update
    remote_token, created = RemotePushDeviceToken.objects.update_or_create(
        user_id=user_id,
        server=server,
        kind=token_kind,
        token=token,
        defaults=dict(
            ios_app_id=ios_app_id,
            last_updated=timezone.now()))

    return json_success()

@has_request_variables
def remote_server_unregister_push(request, entity, token=REQ(),
                                  token_kind=REQ(), ios_app_id=None):
    # type: (HttpRequest, Union[UserProfile, RemoteZulipServer], Text, int, Optional[Text]) -> HttpResponse
    validate_bouncer_token_request(entity, token)
    server = cast(RemoteZulipServer, entity)
    deleted = RemotePushDeviceToken.objects.filter(token=token,
                                                   kind=token_kind,
                                                   server=server).delete()
    if deleted[0] == 0:
        return json_error(_("Token does not exist"))

    return json_success()

@has_request_variables
def remote_server_notify_push(request,  # type: HttpRequest
                              entity,  # type: Union[UserProfile, RemoteZulipServer]
                              payload=REQ(argument_type='body')  # type: Dict[str, Any]
                              ):
    # type: (...) -> HttpResponse
    validate_entity(entity)
    server = cast(RemoteZulipServer, entity)

    user_id = payload['user_id']
    gcm_payload = payload['gcm_payload']
    apns_payload = payload['apns_payload']

    android_devices = list(RemotePushDeviceToken.objects.filter(
        user_id=user_id,
        kind=RemotePushDeviceToken.GCM,
        server=server
    ))

    apple_devices = list(RemotePushDeviceToken.objects.filter(
        user_id=user_id,
        kind=RemotePushDeviceToken.APNS,
        server=server
    ))

    if android_devices:
        send_android_push_notification(android_devices, gcm_payload)

    # TODO: set badge count in a better way
    if apple_devices:
        send_apple_push_notification(user_id, apple_devices,
                                     badge=1, zulip=apns_payload)

    return json_success()