// Copyright (c) 2020-present 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 <consensus/consensus.h>

#include <net.h>

#include <net_processing.h>

#include <primitives/transaction.h>

#include <protocol.h>

#include <script/script.h>

#include <sync.h>

#include <test/fuzz/FuzzedDataProvider.h>

#include <test/fuzz/fuzz.h>

#include <test/fuzz/util.h>

#include <test/fuzz/util/net.h>

#include <test/util/mining.h>

#include <test/util/net.h>

#include <test/util/setup_common.h>

#include <test/util/validation.h>

#include <util/check.h>

#include <util/time.h>

#include <validationinterface.h>

#include <cstdlib>

#include <iostream>

#include <memory>

#include <string>

#include <string_view>

#include <vector>

namespace {

const TestingSetup* g_setup;

std::string_view LIMIT_TO_MESSAGE_TYPE{};

} // namespace

void initialize_process_message()

{

    if (const auto val{std::getenv("LIMIT_TO_MESSAGE_TYPE")}) {

        LIMIT_TO_MESSAGE_TYPE = val;

        Assert(std::count(ALL_NET_MESSAGE_TYPES.begin(), ALL_NET_MESSAGE_TYPES.end(), LIMIT_TO_MESSAGE_TYPE)); // Unknown message type passed

    }

    static const auto testing_setup = MakeNoLogFileContext<const TestingSetup>(

            /*chain_type=*/ChainType::REGTEST,

            {.extra_args = {"-txreconciliation"}});

    g_setup = testing_setup.get();

    for (int i = 0; i < 2 * COINBASE_MATURITY; i++) {

        MineBlock(g_setup->m_node, CScript() << OP_TRUE);

    }

    g_setup->m_node.validation_signals->SyncWithValidationInterfaceQueue();

}

FUZZ_TARGET(process_message, .init = initialize_process_message)

{

    FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());

    ConnmanTestMsg& connman = *static_cast<ConnmanTestMsg*>(g_setup->m_node.connman.get());

    auto& chainman = static_cast<TestChainstateManager&>(*g_setup->m_node.chainman);

    SetMockTime(1610000000); // any time to successfully reset ibd

    chainman.ResetIbd();

    LOCK(NetEventsInterface::g_msgproc_mutex);

    const std::string random_message_type{fuzzed_data_provider.ConsumeBytesAsString(CMessageHeader::COMMAND_SIZE).c_str()};

    if (!LIMIT_TO_MESSAGE_TYPE.empty() && random_message_type != LIMIT_TO_MESSAGE_TYPE) {

        return;

    }

    CNode& p2p_node = *ConsumeNodeAsUniquePtr(fuzzed_data_provider).release();

    connman.AddTestNode(p2p_node);

    FillNode(fuzzed_data_provider, connman, p2p_node);

    const auto mock_time = ConsumeTime(fuzzed_data_provider);

    SetMockTime(mock_time);

    CSerializedNetMsg net_msg;

    net_msg.m_type = random_message_type;

    net_msg.data = ConsumeRandomLengthByteVector(fuzzed_data_provider, MAX_PROTOCOL_MESSAGE_LENGTH);

    connman.FlushSendBuffer(p2p_node);

    (void)connman.ReceiveMsgFrom(p2p_node, std::move(net_msg));

    bool more_work{true};

    while (more_work) {

        p2p_node.fPauseSend = false;

        try {

            more_work = connman.ProcessMessagesOnce(p2p_node);

        } catch (const std::ios_base::failure&) {

        }

        g_setup->m_node.peerman->SendMessages(&p2p_node);

    }

    g_setup->m_node.validation_signals->SyncWithValidationInterfaceQueue();

    g_setup->m_node.connman->StopNodes();

}