use garage_table::util::*;
use garage_util::crdt::*;
use garage_util::error::OkOrMessage;

use crate::garage::Garage;
use crate::helper::bucket::BucketHelper;
use crate::helper::error::*;
use crate::key_table::{Key, KeyFilter};
use crate::permission::BucketKeyPerm;

pub struct KeyHelper<'a>(pub(crate) &'a Garage);

#[allow(clippy::ptr_arg)]
impl<'a> KeyHelper<'a> {
	/// Returns a Key if it is present in key table,
	/// even if it is in deleted state. Querying a non-existing
	/// key ID returns an internal error.
	pub async fn get_internal_key(&self, key_id: &String) -> Result<Key, Error> {
		Ok(self
			.0
			.key_table
			.get(&EmptyKey, key_id)
			.await?
			.ok_or_message(format!("Key {} does not exist", key_id))?)
	}

	/// Returns a Key if it is present in key table,
	/// only if it is in non-deleted state.
	/// Querying a non-existing key ID or a deleted key
	/// returns a bad request error.
	pub async fn get_existing_key(&self, key_id: &String) -> Result<Key, Error> {
		self.0
			.key_table
			.get(&EmptyKey, key_id)
			.await?
			.filter(|b| !b.state.is_deleted())
			.ok_or_else(|| Error::NoSuchAccessKey(key_id.to_string()))
	}

	/// Returns a Key if it is present in key table,
	/// looking it up by key ID or by a match on its name,
	/// only if it is in non-deleted state.
	/// Querying a non-existing key ID or a deleted key
	/// returns a bad request error.
	pub async fn get_existing_matching_key(&self, pattern: &str) -> Result<Key, Error> {
		let candidates = self
			.0
			.key_table
			.get_range(
				&EmptyKey,
				None,
				Some(KeyFilter::MatchesAndNotDeleted(pattern.to_string())),
				10,
				EnumerationOrder::Forward,
			)
			.await?
			.into_iter()
			.collect::<Vec<_>>();
		if candidates.len() != 1 {
			Err(Error::BadRequest(format!(
				"{} matching keys",
				candidates.len()
			)))
		} else {
			Ok(candidates.into_iter().next().unwrap())
		}
	}

	/// Deletes an API access key
	pub async fn delete_key(&self, key: &mut Key) -> Result<(), Error> {
		let bucket_helper = BucketHelper(self.0);

		let state = key.state.as_option_mut().unwrap();

		// --- done checking, now commit ---
		// (the step at unset_local_bucket_alias will fail if a bucket
		// does not have another alias, the deletion will be
		// interrupted in the middle if that happens)

		// 1. Delete local aliases
		for (alias, _, to) in state.local_aliases.items().iter() {
			if let Some(bucket_id) = to {
				bucket_helper
					.unset_local_bucket_alias(*bucket_id, &key.key_id, alias)
					.await?;
			}
		}

		// 2. Remove permissions on all authorized buckets
		for (ab_id, _auth) in state.authorized_buckets.items().iter() {
			bucket_helper
				.set_bucket_key_permissions(*ab_id, &key.key_id, BucketKeyPerm::NO_PERMISSIONS)
				.await?;
		}

		// 3. Actually delete key
		key.state = Deletable::delete();
		self.0.key_table.insert(key).await?;

		Ok(())
	}
}