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use async_trait::async_trait;
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use super::{KeyOperation, KeyValue, Output};
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use crate::keyvalue::AsyncKeyValue;
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use crate::Error;
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/// A namespaced key-value store. All operations performed with this will be
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/// separate from other namespaces.
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pub struct Namespaced<'a, K> {
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    namespace: String,
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    kv: &'a K,
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}
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impl<'a, K> Namespaced<'a, K> {
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    pub(crate) const fn new(namespace: String, kv: &'a K) -> Self {
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        Self { namespace, kv }
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    }
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}
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#[async_trait]
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impl<'a, K> KeyValue for Namespaced<'a, K>
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where
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    K: KeyValue,
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{
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    fn execute_key_operation(&self, op: KeyOperation) -> Result<Output, Error> {
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        self.kv.execute_key_operation(op)
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    }
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    fn key_namespace(&self) -> Option<&'_ str> {
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        Some(&self.namespace)
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    }
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    fn with_key_namespace(&'_ self, namespace: &str) -> Namespaced<'_, Self>
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    where
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        Self: Sized,
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    {
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        Namespaced {
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            namespace: format!("{}\u{0}{namespace}", self.namespace),
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            kv: self,
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        }
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    }
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}
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#[async_trait]
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impl<'a, K> AsyncKeyValue for Namespaced<'a, K>
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where
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    K: AsyncKeyValue,
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{
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    async fn execute_key_operation(&self, op: KeyOperation) -> Result<Output, Error> {
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        self.kv.execute_key_operation(op).await
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    }
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    fn key_namespace(&self) -> Option<&'_ str> {
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        Some(&self.namespace)
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    }
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    fn with_key_namespace(&'_ self, namespace: &str) -> Namespaced<'_, Self>
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    where
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        Self: Sized,
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    {
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        Namespaced {
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            namespace: format!("{}\u{0}{namespace}", self.namespace),
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            kv: self,
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        }
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    }
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}