// Copyright (c) 2026 The Limenka developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef LIMENKA_NODE_BLUKECOIN_H
#define LIMENKA_NODE_BLUKECOIN_H

#include <netaddress.h>
#include <sync.h>
#include <uint256.h>

#include <optional>
#include <set>
#include <vector>

class CBlockHeader;
class CService;
namespace Consensus { struct Params; }

namespace node {

//! A bitcoin-blake2b (blukecoin) node is a fork of the parent chain that
//! keeps the parent's P2P identity (magic, port, genesis) but hashes block
//! headers with blake2b instead of SHA256d.  Its blocks can therefore never
//! be validated on the parent chain, which is exactly how it is detected:
//! a transmitted header whose claimed difficulty is within the mainnet
//! powLimit range but whose SHA256d hash does not meet it is on a foreign
//! hashing chain.
class BlukecoinManager
{
public:
    //! Test a single header for the blake2b-chain signature.  Returns
    //! std::nullopt when the header's nBits is outside the mainnet powLimit
    //! range (a low-work testnet fork, not blukecoin).
    static std::optional<bool> HeaderLooksBlake2b(const CBlockHeader& header, const Consensus::Params& params);

    //! Record a detected blukecoin node address (ip:port).
    void NoteDetected(const CService& addr);

    //! Whether the address is already known as a blukecoin node.
    bool IsKnown(const CService& addr) const;

    //! Snapshot of all known blukecoin node addresses.
    std::vector<CService> GetKnown() const;

private:
    mutable Mutex m_mutex;
    std::set<CService> m_known GUARDED_BY(m_mutex);
};

} // namespace node

#endif // LIMENKA_NODE_BLUKECOIN_H