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// Copyright (c) The Diem Core Contributors
// SPDX-License-Identifier: Apache-2.0

//! This module defines physical storage schema for nodes in the state Jellyfish Merkle Tree.
//! Node is identified by [NodeKey](jellyfish-merkle::node_type::NodeKey).
//! ```text
//! |<----key--->|<-----value----->|
//! |  node_key  | serialized_node |
//! ```

use crate::schema::JELLYFISH_MERKLE_NODE_CF_NAME;
use anyhow::Result;
use byteorder::{BigEndian, WriteBytesExt};
use diem_jellyfish_merkle::node_type::NodeKey;
use diem_types::{account_state_blob::AccountStateBlob, transaction::Version};
use schemadb::{
    define_schema,
    schema::{KeyCodec, SeekKeyCodec, ValueCodec},
};
use std::mem::size_of;

type Node = diem_jellyfish_merkle::node_type::Node<AccountStateBlob>;

define_schema!(
    JellyfishMerkleNodeSchema,
    NodeKey,
    Node,
    JELLYFISH_MERKLE_NODE_CF_NAME
);

impl KeyCodec<JellyfishMerkleNodeSchema> for NodeKey {
    fn encode_key(&self) -> Result<Vec<u8>> {
        self.encode()
    }

    fn decode_key(data: &[u8]) -> Result<Self> {
        Self::decode(data)
    }
}

impl ValueCodec<JellyfishMerkleNodeSchema> for Node {
    fn encode_value(&self) -> Result<Vec<u8>> {
        self.encode()
    }

    fn decode_value(data: &[u8]) -> Result<Self> {
        Self::decode(data)
    }
}

impl SeekKeyCodec<JellyfishMerkleNodeSchema> for (Version, u8) {
    fn encode_seek_key(&self) -> Result<Vec<u8>> {
        let mut out = Vec::with_capacity(size_of::<Version>() + size_of::<u8>());
        out.write_u64::<BigEndian>(self.0)?;
        out.write_u8(self.1)?;
        Ok(out)
    }
}

#[cfg(test)]
mod test;