use ruma::{RoomId, DeviceId, UserId};
use crate::Result;

pub trait Data {
    fn lazy_load_was_sent_before(
        &self,
        user_id: &UserId,
        device_id: &DeviceId,
        room_id: &RoomId,
        ll_user: &UserId,
    ) -> Result<bool>;

    fn lazy_load_confirm_delivery(
        &self,
        user_id: &UserId,
        device_id: &DeviceId,
        room_id: &RoomId,
        confirmed_user_ids: &mut dyn Iterator<Item=&UserId>,
    ) -> Result<()>;

    fn lazy_load_reset(
        &self,
        user_id: &UserId,
        device_id: &DeviceId,
        room_id: &RoomId,
    ) -> Result<()>;
}