use std::collections::HashMap;

use ruma::{
	events::{AnyEphemeralRoomEvent, RoomAccountDataEventType},
	serde::Raw,
	RoomId, UserId,
};

use crate::Result;

pub trait Data: Send + Sync {
	/// Places one event in the account data of the user and removes the
	/// previous entry.
	fn update(
		&self, room_id: Option<&RoomId>, user_id: &UserId, event_type: RoomAccountDataEventType,
		data: &serde_json::Value,
	) -> Result<()>;

	/// Searches the account data for a specific kind.
	fn get(
		&self, room_id: Option<&RoomId>, user_id: &UserId, kind: RoomAccountDataEventType,
	) -> Result<Option<Box<serde_json::value::RawValue>>>;

	/// Returns all changes to the account data that happened after `since`.
	fn changes_since(
		&self, room_id: Option<&RoomId>, user_id: &UserId, since: u64,
	) -> Result<HashMap<RoomAccountDataEventType, Raw<AnyEphemeralRoomEvent>>>;
}