use ruma::{OwnedRoomId, RoomId};
use tracing::error;

use crate::{database::KeyValueDatabase, service, services, utils, Error, Result};

impl service::rooms::metadata::Data for KeyValueDatabase {
	fn exists(&self, room_id: &RoomId) -> Result<bool> {
		let prefix = match services().rooms.short.get_shortroomid(room_id)? {
			Some(b) => b.to_be_bytes().to_vec(),
			None => return Ok(false),
		};

		// Look for PDUs in that room.
		Ok(self
			.pduid_pdu
			.iter_from(&prefix, false)
			.next()
			.filter(|(k, _)| k.starts_with(&prefix))
			.is_some())
	}

	fn iter_ids<'a>(&'a self) -> Box<dyn Iterator<Item = Result<OwnedRoomId>> + 'a> {
		Box::new(self.roomid_shortroomid.iter().map(|(bytes, _)| {
			RoomId::parse(
				utils::string_from_bytes(&bytes)
					.map_err(|_| Error::bad_database("Room ID in publicroomids is invalid unicode."))?,
			)
			.map_err(|_| Error::bad_database("Room ID in roomid_shortroomid is invalid."))
		}))
	}

	fn is_disabled(&self, room_id: &RoomId) -> Result<bool> {
		Ok(self.disabledroomids.get(room_id.as_bytes())?.is_some())
	}

	fn disable_room(&self, room_id: &RoomId, disabled: bool) -> Result<()> {
		if disabled {
			self.disabledroomids.insert(room_id.as_bytes(), &[])?;
		} else {
			self.disabledroomids.remove(room_id.as_bytes())?;
		}

		Ok(())
	}

	fn is_banned(&self, room_id: &RoomId) -> Result<bool> { Ok(self.bannedroomids.get(room_id.as_bytes())?.is_some()) }

	fn ban_room(&self, room_id: &RoomId, banned: bool) -> Result<()> {
		if banned {
			self.bannedroomids.insert(room_id.as_bytes(), &[])?;
		} else {
			self.bannedroomids.remove(room_id.as_bytes())?;
		}

		Ok(())
	}

	fn list_banned_rooms<'a>(&'a self) -> Box<dyn Iterator<Item = Result<OwnedRoomId>> + 'a> {
		Box::new(self.bannedroomids.iter().map(
			|(room_id_bytes, _ /* non-banned rooms should not be in this table */)| {
				let room_id = utils::string_from_bytes(&room_id_bytes)
					.map_err(|e| {
						error!("Invalid room_id bytes in bannedroomids: {e}");
						Error::bad_database("Invalid room_id in bannedroomids.")
					})?
					.try_into()
					.map_err(|e| {
						error!("Invalid room_id in bannedroomids: {e}");
						Error::bad_database("Invalid room_id in bannedroomids")
					})?;

				Ok(room_id)
			},
		))
	}
}
