from typing import List, Union

from django.utils.translation import gettext as _

from zerver.lib.exceptions import ResourceNotFoundError
from zerver.models import ScheduledMessage, UserProfile
from zerver.models.scheduled_jobs import (
    APIScheduledDirectMessageDict,
    APIScheduledStreamMessageDict,
)


def access_scheduled_message(
    user_profile: UserProfile, scheduled_message_id: int
) -> ScheduledMessage:
    try:
        return ScheduledMessage.objects.get(id=scheduled_message_id, sender=user_profile)
    except ScheduledMessage.DoesNotExist:
        raise ResourceNotFoundError(_("Scheduled message does not exist"))


def get_undelivered_scheduled_messages(
    user_profile: UserProfile,
) -> List[Union[APIScheduledDirectMessageDict, APIScheduledStreamMessageDict]]:
    scheduled_messages = ScheduledMessage.objects.filter(
        realm_id=user_profile.realm_id,
        sender=user_profile,
        # Notably, we don't require failed=False, since we will want
        # to display those to users.
        delivered=False,
        delivery_type=ScheduledMessage.SEND_LATER,
    ).order_by("scheduled_timestamp")
    scheduled_message_dicts: List[
        Union[APIScheduledDirectMessageDict, APIScheduledStreamMessageDict]
    ] = [scheduled_message.to_dict() for scheduled_message in scheduled_messages]
    return scheduled_message_dicts