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// Copyright (c) 2022, Mysten Labs, Inc.
// SPDX-License-Identifier: Apache-2.0

use serde::{
    de::{Deserializer, Error},
    ser::{Error as SerError, Serializer},
};
use serde_with::{Bytes, DeserializeAs, SerializeAs};
use std::fmt::Debug;

#[inline]
fn to_custom_error<'de, D, E>(e: E) -> D::Error
where
    E: Debug,
    D: Deserializer<'de>,
{
    D::Error::custom(format!("byte deserialization failed, cause by: {:?}", e))
}

#[inline]
fn to_custom_ser_error<S, E>(e: E) -> S::Error
where
    E: Debug,
    S: Serializer,
{
    S::Error::custom(format!("byte serialization failed, cause by: {:?}", e))
}

// Serializes a bitmap according to the roaring bitmap on-disk standard.
/// https://github.com/RoaringBitmap/RoaringFormatSpec
pub struct NarwhalBitmap;

impl SerializeAs<roaring::RoaringBitmap> for NarwhalBitmap {
    fn serialize_as<S>(source: &roaring::RoaringBitmap, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        let mut bytes = vec![];

        source
            .serialize_into(&mut bytes)
            .map_err(to_custom_ser_error::<S, _>)?;
        Bytes::serialize_as(&bytes, serializer)
    }
}

impl<'de> DeserializeAs<'de, roaring::RoaringBitmap> for NarwhalBitmap {
    fn deserialize_as<D>(deserializer: D) -> Result<roaring::RoaringBitmap, D::Error>
    where
        D: Deserializer<'de>,
    {
        let bytes: Vec<u8> = Bytes::deserialize_as(deserializer)?;
        roaring::RoaringBitmap::deserialize_from(&bytes[..]).map_err(to_custom_error::<'de, D, _>)
    }
}