use std::{collections::HashMap, sync::Arc};

use async_trait::async_trait;
use ruma::{events::StateEventType, EventId, RoomId};

use crate::{PduEvent, Result};

#[async_trait]
pub trait Data: Send + Sync {
    /// Builds a StateMap by iterating over all keys that start
    /// with state_hash, this gives the full state for the given state_hash.
    async fn state_full_ids(&self, shortstatehash: u64) -> Result<HashMap<u64, Arc<EventId>>>;

    async fn state_full(
        &self,
        shortstatehash: u64,
    ) -> Result<HashMap<(StateEventType, String), Arc<PduEvent>>>;

    /// Returns a single PDU from `room_id` with key (`event_type`, `state_key`).
    fn state_get_id(
        &self,
        shortstatehash: u64,
        event_type: &StateEventType,
        state_key: &str,
    ) -> Result<Option<Arc<EventId>>>;

    /// Returns a single PDU from `room_id` with key (`event_type`, `state_key`).
    fn state_get(
        &self,
        shortstatehash: u64,
        event_type: &StateEventType,
        state_key: &str,
    ) -> Result<Option<Arc<PduEvent>>>;

    /// Returns the state hash for this pdu.
    fn pdu_shortstatehash(&self, event_id: &EventId) -> Result<Option<u64>>;

    /// Returns the full room state.
    async fn room_state_full(
        &self,
        room_id: &RoomId,
    ) -> Result<HashMap<(StateEventType, String), Arc<PduEvent>>>;

    /// Returns a single PDU from `room_id` with key (`event_type`, `state_key`).
    fn room_state_get_id(
        &self,
        room_id: &RoomId,
        event_type: &StateEventType,
        state_key: &str,
    ) -> Result<Option<Arc<EventId>>>;

    /// Returns a single PDU from `room_id` with key (`event_type`, `state_key`).
    fn room_state_get(
        &self,
        room_id: &RoomId,
        event_type: &StateEventType,
        state_key: &str,
    ) -> Result<Option<Arc<PduEvent>>>;
}