// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2019 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <primitives/block.h>

#include <hash.h>
#include <tinyformat.h>
#include <util/strencodings.h>
#include <crypto/common.h>
#include <crypto/randomx_hasher.h>

uint256 CBlockHeader::GetHash() const
{
    return SerializeHash(*this);
}

uint256 CBlockHeader::GetPoWHash() const
{
    // MoonBite (ADR-001): RandomX over the 80-byte serialized header. The cache
    // is keyed by the 32-byte MBITE_RX_SEED (SHA-256 of "MBITE-RX-1"); per-epoch seed rotation is a
    // documented follow-up (see crypto/randomx_hasher.h). Header layout is
    // nVersion(4) + hashPrevBlock(32) + hashMerkleRoot(32) + nTime(4) +
    // nBits(4) + nNonce(4) = 80 contiguous bytes starting at &nVersion.
    uint256 thash;
    RandomXHashBytes(BEGIN(nVersion), 80, (unsigned char*)BEGIN(thash));
    return thash;
}

std::string CBlock::ToString() const
{
    std::stringstream s;
    s << strprintf("CBlock(hash=%s, ver=0x%08x, hashPrevBlock=%s, hashMerkleRoot=%s, nTime=%u, nBits=%08x, nNonce=%u, vtx=%u)\n",
        GetHash().ToString(),
        nVersion,
        hashPrevBlock.ToString(),
        hashMerkleRoot.ToString(),
        nTime, nBits, nNonce,
        vtx.size());
    for (const auto& tx : vtx) {
        s << "  " << tx->ToString() << "\n";
    }
    return s.str();
}

CTransactionRef CBlock::GetHogEx() const noexcept
{
    if (vtx.size() >= 2 && vtx.back()->IsHogEx()) {
        assert(!vtx.back()->vout.empty());
        return vtx.back();
    }

    return nullptr;
}