from django.core.exceptions import PermissionDenied
from django.shortcuts import get_object_or_404
from apps.tickets.policies import TicketPolicy
from apps.accounts.magic_access import get_ticket_magic_access
from .delivery import attachment_response
from .models import Attachment
from django.views.decorators.cache import never_cache
def _authorized_attachment(request,public_id):
    attachment=get_object_or_404(Attachment.objects.select_related("message__ticket"),public_id=public_id); ticket=attachment.message.ticket
    magic_link = None if request.user.is_authenticated else get_ticket_magic_access(request,ticket)
    if not TicketPolicy.can_view(request.user,ticket) and not magic_link: raise PermissionDenied
    from apps.tickets.dispatch_responses import can_read_response
    actor = ticket.customer if magic_link else request.user
    if not can_read_response(actor, attachment.message): raise PermissionDenied
    if attachment.message.is_internal and (magic_link or getattr(request.user,"account_type",None)=="CUSTOMER"): raise PermissionDenied
    if attachment.message.deleted_at and not request.user.has_perm("messaging.view_deleted_message_content"): raise PermissionDenied
    return attachment
@never_cache
def view(request,public_id):
    return attachment_response(_authorized_attachment(request, public_id))
@never_cache
def download(request,public_id):
    return attachment_response(_authorized_attachment(request, public_id), download=True)