//------------------------------------------------------------------------------
/*
    This file is part of rippled: https://github.com/ripple/rippled
    Copyright (c) 2012, 2020 Ripple Labs Inc.

    Permission to use, copy, modify, and/or distribute this software for any
    purpose  with  or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================

#include <ripple/app/ledger/LedgerMaster.h>
#include <ripple/app/ledger/LedgerReplayer.h>
#include <ripple/app/ledger/impl/LedgerReplayMsgHandler.h>
#include <ripple/app/main/Application.h>

#include <memory>

namespace ripple {
LedgerReplayMsgHandler::LedgerReplayMsgHandler(
    Application& app,
    LedgerReplayer& replayer)
    : app_(app)
    , replayer_(replayer)
    , journal_(app.journal("LedgerReplayMsgHandler"))
{
}

protocol::TMProofPathResponse
LedgerReplayMsgHandler::processProofPathRequest(
    std::shared_ptr<protocol::TMProofPathRequest> const& msg)
{
    protocol::TMProofPathRequest& packet = *msg;
    protocol::TMProofPathResponse reply;

    if (!packet.has_key() || !packet.has_ledgerhash() || !packet.has_type() ||
        packet.ledgerhash().size() != uint256::size() ||
        packet.key().size() != uint256::size() ||
        !protocol::TMLedgerMapType_IsValid(packet.type()))
    {
        JLOG(journal_.debug()) << "getProofPath: Invalid request";
        reply.set_error(protocol::TMReplyError::reBAD_REQUEST);
        return reply;
    }
    reply.set_key(packet.key());
    reply.set_ledgerhash(packet.ledgerhash());
    reply.set_type(packet.type());

    uint256 const key(packet.key());
    uint256 const ledgerHash(packet.ledgerhash());
    auto ledger = app_.getLedgerMaster().getLedgerByHash(ledgerHash);
    if (!ledger)
    {
        JLOG(journal_.debug())
            << "getProofPath: Don't have ledger " << ledgerHash;
        reply.set_error(protocol::TMReplyError::reNO_LEDGER);
        return reply;
    }

    auto const path = [&]() -> std::optional<std::vector<Blob>> {
        switch (packet.type())
        {
            case protocol::lmACCOUNT_STATE:
                return ledger->stateMap().getProofPath(key);
            case protocol::lmTRANASCTION:
                return ledger->txMap().getProofPath(key);
            default:
                // should not be here
                // because already tested with TMLedgerMapType_IsValid()
                return {};
        }
    }();

    if (!path)
    {
        JLOG(journal_.debug()) << "getProofPath: Don't have the node " << key
                               << " of ledger " << ledgerHash;
        reply.set_error(protocol::TMReplyError::reNO_NODE);
        return reply;
    }

    // pack header
    Serializer nData(128);
    addRaw(ledger->info(), nData);
    reply.set_ledgerheader(nData.getDataPtr(), nData.getLength());
    // pack path
    for (auto const& b : *path)
        reply.add_path(b.data(), b.size());

    JLOG(journal_.debug()) << "getProofPath for the node " << key
                           << " of ledger " << ledgerHash << " path length "
                           << path->size();
    return reply;
}

bool
LedgerReplayMsgHandler::processProofPathResponse(
    std::shared_ptr<protocol::TMProofPathResponse> const& msg)
{
    protocol::TMProofPathResponse& reply = *msg;
    if (reply.has_error() || !reply.has_key() || !reply.has_ledgerhash() ||
        !reply.has_type() || !reply.has_ledgerheader() ||
        reply.path_size() == 0)
    {
        JLOG(journal_.debug()) << "Bad message: Error reply";
        return false;
    }

    if (reply.type() != protocol::lmACCOUNT_STATE)
    {
        JLOG(journal_.debug())
            << "Bad message: we only support the state ShaMap for now";
        return false;
    }

    // deserialize the header
    auto info = deserializeHeader(
        {reply.ledgerheader().data(), reply.ledgerheader().size()});
    uint256 replyHash(reply.ledgerhash());
    if (calculateLedgerHash(info) != replyHash)
    {
        JLOG(journal_.debug()) << "Bad message: Hash mismatch";
        return false;
    }
    info.hash = replyHash;

    uint256 key(reply.key());
    if (key != keylet::skip().key)
    {
        JLOG(journal_.debug())
            << "Bad message: we only support the short skip list for now. "
               "Key in reply "
            << key;
        return false;
    }

    // verify the skip list
    std::vector<Blob> path;
    path.reserve(reply.path_size());
    for (int i = 0; i < reply.path_size(); ++i)
    {
        path.emplace_back(reply.path(i).begin(), reply.path(i).end());
    }

    if (!SHAMap::verifyProofPath(info.accountHash, key, path))
    {
        JLOG(journal_.debug()) << "Bad message: Proof path verify failed";
        return false;
    }

    // deserialize the SHAMapItem
    auto node = SHAMapTreeNode::makeFromWire(makeSlice(path.front()));
    if (!node || !node->isLeaf())
    {
        JLOG(journal_.debug()) << "Bad message: Cannot deserialize";
        return false;
    }
    auto item = static_cast<SHAMapLeafNode*>(node.get())->peekItem();
    if (!item)
    {
        JLOG(journal_.debug()) << "Bad message: Cannot get ShaMapItem";
        return false;
    }

    replayer_.gotSkipList(info, item);
    return true;
}

protocol::TMReplayDeltaResponse
LedgerReplayMsgHandler::processReplayDeltaRequest(
    std::shared_ptr<protocol::TMReplayDeltaRequest> const& msg)
{
    protocol::TMReplayDeltaRequest& packet = *msg;
    protocol::TMReplayDeltaResponse reply;

    if (!packet.has_ledgerhash() ||
        packet.ledgerhash().size() != uint256::size())
    {
        JLOG(journal_.debug()) << "getReplayDelta: Invalid request";
        reply.set_error(protocol::TMReplyError::reBAD_REQUEST);
        return reply;
    }
    reply.set_ledgerhash(packet.ledgerhash());

    uint256 const ledgerHash{packet.ledgerhash()};
    auto ledger = app_.getLedgerMaster().getLedgerByHash(ledgerHash);
    if (!ledger || !ledger->isImmutable())
    {
        JLOG(journal_.debug())
            << "getReplayDelta: Don't have ledger " << ledgerHash;
        reply.set_error(protocol::TMReplyError::reNO_LEDGER);
        return reply;
    }

    // pack header
    Serializer nData(128);
    addRaw(ledger->info(), nData);
    reply.set_ledgerheader(nData.getDataPtr(), nData.getLength());
    // pack transactions
    auto const& txMap = ledger->txMap();
    txMap.visitLeaves([&](std::shared_ptr<SHAMapItem const> const& txNode) {
        reply.add_transaction(txNode->data(), txNode->size());
    });

    JLOG(journal_.debug()) << "getReplayDelta for ledger " << ledgerHash
                           << " txMap hash " << txMap.getHash().as_uint256();
    return reply;
}

bool
LedgerReplayMsgHandler::processReplayDeltaResponse(
    std::shared_ptr<protocol::TMReplayDeltaResponse> const& msg)
{
    protocol::TMReplayDeltaResponse& reply = *msg;
    if (reply.has_error() || !reply.has_ledgerheader())
    {
        JLOG(journal_.debug()) << "Bad message: Error reply";
        return false;
    }

    auto info = deserializeHeader(
        {reply.ledgerheader().data(), reply.ledgerheader().size()});
    uint256 replyHash(reply.ledgerhash());
    if (calculateLedgerHash(info) != replyHash)
    {
        JLOG(journal_.debug()) << "Bad message: Hash mismatch";
        return false;
    }
    info.hash = replyHash;

    auto numTxns = reply.transaction_size();
    std::map<std::uint32_t, std::shared_ptr<STTx const>> orderedTxns;
    SHAMap txMap(SHAMapType::TRANSACTION, app_.getNodeFamily());
    try
    {
        for (int i = 0; i < numTxns; ++i)
        {
            // deserialize:
            // -- TxShaMapItem for building a ShaMap for verification
            // -- Tx
            // -- TxMetaData for Tx ordering
            Serializer shaMapItemData(
                reply.transaction(i).data(), reply.transaction(i).size());

            SerialIter txMetaSit(makeSlice(reply.transaction(i)));
            SerialIter txSit(txMetaSit.getSlice(txMetaSit.getVLDataLength()));
            SerialIter metaSit(txMetaSit.getSlice(txMetaSit.getVLDataLength()));

            auto tx = std::make_shared<STTx const>(txSit);
            if (!tx)
            {
                JLOG(journal_.debug()) << "Bad message: Cannot deserialize";
                return false;
            }
            auto tid = tx->getTransactionID();
            STObject meta(metaSit, sfMetadata);
            orderedTxns.emplace(meta[sfTransactionIndex], std::move(tx));

            auto item =
                std::make_shared<SHAMapItem const>(tid, shaMapItemData.slice());
            if (!item ||
                !txMap.addGiveItem(SHAMapNodeType::tnTRANSACTION_MD, item))
            {
                JLOG(journal_.debug()) << "Bad message: Cannot deserialize";
                return false;
            }
        }
    }
    catch (std::exception const&)
    {
        JLOG(journal_.debug()) << "Bad message: Cannot deserialize";
        return false;
    }

    if (txMap.getHash().as_uint256() != info.txHash)
    {
        JLOG(journal_.debug()) << "Bad message: Transactions verify failed";
        return false;
    }

    replayer_.gotReplayDelta(info, std::move(orderedTxns));
    return true;
}

}  // namespace ripple