use std::sync::Arc;

use ruma::{RoomId, UserId};
use tuwunel_core::{
	Result, implement, trace,
	utils::stream::{ReadyExt, TryIgnore},
};
use tuwunel_database::{Database, Deserialized, Interfix, Map};

use crate::rooms::short::ShortStateHash;

pub struct Service {
	db: Data,
	services: Arc<crate::services::OnceServices>,
}

struct Data {
	db: Arc<Database>,
	userroomid_notificationcount: Arc<Map>,
	userroomid_highlightcount: Arc<Map>,
	roomuserid_lastnotificationread: Arc<Map>,
	roomsynctoken_shortstatehash: Arc<Map>,
}

impl crate::Service for Service {
	fn build(args: &crate::Args<'_>) -> Result<Arc<Self>> {
		Ok(Arc::new(Self {
			db: Data {
				db: args.db.clone(),
				userroomid_notificationcount: args.db["userroomid_notificationcount"].clone(),
				userroomid_highlightcount: args.db["userroomid_highlightcount"].clone(),
				roomuserid_lastnotificationread: args.db["userroomid_highlightcount"].clone(),
				roomsynctoken_shortstatehash: args.db["roomsynctoken_shortstatehash"].clone(),
			},
			services: args.services.clone(),
		}))
	}

	fn name(&self) -> &str { crate::service::make_name(std::module_path!()) }
}

#[implement(Service)]
pub fn reset_notification_counts(&self, user_id: &UserId, room_id: &RoomId) {
	let count = self.services.globals.next_count();

	let userroom_id = (user_id, room_id);
	self.db
		.userroomid_highlightcount
		.put(userroom_id, 0_u64);
	self.db
		.userroomid_notificationcount
		.put(userroom_id, 0_u64);

	let roomuser_id = (room_id, user_id);
	self.db
		.roomuserid_lastnotificationread
		.put(roomuser_id, *count);
}

#[implement(Service)]
pub async fn notification_count(&self, user_id: &UserId, room_id: &RoomId) -> u64 {
	let key = (user_id, room_id);
	self.db
		.userroomid_notificationcount
		.qry(&key)
		.await
		.deserialized()
		.unwrap_or(0)
}

#[implement(Service)]
pub async fn highlight_count(&self, user_id: &UserId, room_id: &RoomId) -> u64 {
	let key = (user_id, room_id);
	self.db
		.userroomid_highlightcount
		.qry(&key)
		.await
		.deserialized()
		.unwrap_or(0)
}

#[implement(Service)]
pub async fn last_notification_read(&self, user_id: &UserId, room_id: &RoomId) -> u64 {
	let key = (room_id, user_id);
	self.db
		.roomuserid_lastnotificationread
		.qry(&key)
		.await
		.deserialized()
		.unwrap_or(0)
}

#[implement(Service)]
pub async fn delete_room_notification_read(&self, room_id: &RoomId) -> Result {
	let key = (room_id, Interfix);
	self.db
		.roomuserid_lastnotificationread
		.keys_prefix_raw(&key)
		.ignore_err()
		.ready_for_each(|key| {
			trace!("Removing key: {key:?}");
			self.db
				.roomuserid_lastnotificationread
				.remove(key);
		})
		.await;

	Ok(())
}

#[implement(Service)]
#[tracing::instrument(level = "trace", skip(self))]
pub async fn associate_token_shortstatehash(
	&self,
	room_id: &RoomId,
	token: u64,
	shortstatehash: ShortStateHash,
) {
	let shortroomid = self
		.services
		.short
		.get_shortroomid(room_id)
		.await
		.expect("room exists");

	let _cork = self.db.db.cork();
	let key: &[u64] = &[shortroomid, token];
	self.db
		.roomsynctoken_shortstatehash
		.put(key, shortstatehash);
}

#[implement(Service)]
pub async fn get_token_shortstatehash(
	&self,
	room_id: &RoomId,
	token: u64,
) -> Result<ShortStateHash> {
	let shortroomid = self
		.services
		.short
		.get_shortroomid(room_id)
		.await?;

	let key: &[u64] = &[shortroomid, token];
	self.db
		.roomsynctoken_shortstatehash
		.qry(key)
		.await
		.deserialized()
}

#[implement(Service)]
pub async fn delete_room_synctokens(&self, room_id: &RoomId) -> Result {
	let shortroomid = self
		.services
		.short
		.get_shortroomid(room_id)
		.await?;

	self.db
		.roomsynctoken_shortstatehash
		.keys_prefix_raw(&shortroomid)
		.ignore_err()
		.ready_for_each(|key| {
			trace!("Removing key: {key:?}");
			self.db.roomsynctoken_shortstatehash.remove(key);
		})
		.await;

	Ok(())
}