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

// Copyright 2021 Conflux Foundation. All rights reserved.
// Conflux is free software and distributed under GNU General Public License.
// See http://www.gnu.org/licenses/

//! This module defines physical storage schema for LedgerInfoWithSignatures
//! structure.
//!
//! Serialized LedgerInfoWithSignatures identified by `epoch`.
//! ```text
//! |<---key--->|<---------------value------------->|
//! | epoch | ledger_info_with_signatures bytes |
//! ```
//!
//! `epoch` is serialized in big endian so that records in RocksDB will be in
//! order of their numeric value.

use crate::schema::{ensure_slice_len_eq, REWARD_EVENT_CF_NAME};
use anyhow::Result;
use byteorder::{BigEndian, ReadBytesExt};
use diem_types::reward_distribution_event::{
    RewardDistributionEventV1, RewardDistributionEventV2,
};
use schemadb::{
    define_schema,
    schema::{KeyCodec, ValueCodec},
};
use std::mem::size_of;

define_schema!(
    RewardEventSchema,
    u64, /* epoch num */
    RewardDistributionEventV2,
    REWARD_EVENT_CF_NAME
);

impl KeyCodec<RewardEventSchema> for u64 {
    fn encode_key(&self) -> Result<Vec<u8>> { Ok(self.to_be_bytes().to_vec()) }

    fn decode_key(mut data: &[u8]) -> Result<Self> {
        ensure_slice_len_eq(data, size_of::<Self>())?;
        Ok(data.read_u64::<BigEndian>()?)
    }
}

impl ValueCodec<RewardEventSchema> for RewardDistributionEventV2 {
    fn encode_value(&self) -> Result<Vec<u8>> {
        bcs::to_bytes(self).map_err(Into::into)
    }

    fn decode_value(data: &[u8]) -> Result<Self> {
        bcs::from_bytes(data)
            // If `data` cannot be deserialized to `Self`, it may be stored in
            // an older version.
            .or(bcs::from_bytes::<RewardDistributionEventV1>(data)
                .map(Into::into))
            .map_err(Into::into)
    }
}