// 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 <addrman.h>

#include <banman.h>

#include <consensus/consensus.h>

#include <kernel/chainparams.h>

#include <net.h>

#include <net_processing.h>

#include <node/mining_types.h>

#include <primitives/block.h>

#include <primitives/transaction.h>

#include <protocol.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/random.h>

#include <test/util/setup_common.h>

#include <test/util/time.h>

#include <test/util/validation.h>

#include <util/time.h>

#include <validation.h>

#include <validationinterface.h>

#include <functional>

#include <ios>

#include <memory>

#include <optional>

#include <string>

#include <utility>

#include <vector>

namespace {

TestingSetup* g_setup;

void ResetChainman(TestingSetup& setup)

{

    SetMockTime(setup.m_node.chainman->GetParams().GenesisBlock().Time());

    setup.m_node.chainman.reset();

    setup.m_make_chainman();

    setup.LoadVerifyActivateChainstate();

    node::BlockCreateOptions options;

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

  Branch (48:21): [True: 0, False: 0]

        MineBlock(setup.m_node, options);

    }

}

} // namespace

void initialize_process_messages()

{

    static const auto testing_setup{

        MakeNoLogFileContext<TestingSetup>(

            /*chain_type=*/ChainType::REGTEST,

            {}),

    };

    g_setup = testing_setup.get();

    ResetChainman(*g_setup);

}

FUZZ_TARGET(process_messages, .init = initialize_process_messages)

{

    SeedRandomStateForTest(SeedRand::ZEROS);

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

    auto& node{g_setup->m_node};

    auto& connman{static_cast<ConnmanTestMsg&>(*node.connman)};

    connman.Reset();

    auto& chainman{static_cast<TestChainstateManager&>(*node.chainman)};

    const auto block_index_size{WITH_LOCK(chainman.GetMutex(), return chainman.BlockIndex().size())};

    FakeNodeClock clock{1610000000s}; // any time to successfully reset ibd

    FakeSteadyClock steady_clock;

    chainman.ResetIbd();

    chainman.DisableNextWrite();

    // Reset, so that dangling pointers can be detected by sanitizers.

    node.banman.reset();

    node.addrman.reset();

    node.peerman.reset();

    node.addrman = std::make_unique<AddrMan>(*node.netgroupman, /*deterministic=*/true, /*consistency_check_ratio=*/0);

    node.peerman = PeerManager::make(connman, *node.addrman,

                                     /*banman=*/nullptr, chainman,

                                     *node.mempool, *node.warnings,

                                     PeerManager::Options{

                                         .reconcile_txs = true,

                                         .deterministic_rng = true,

                                     });

    connman.SetMsgProc(node.peerman.get());

    connman.SetAddrman(*node.addrman);

    node.validation_signals->RegisterValidationInterface(node.peerman.get());

    LOCK(NetEventsInterface::g_msgproc_mutex);

    std::vector<CNode*> peers;

    const auto num_peers_to_add = fuzzed_data_provider.ConsumeIntegralInRange(1, 3);

    for (int i = 0; i < num_peers_to_add; ++i) {

  Branch (101:21): [True: 0, False: 0]

        peers.push_back(ConsumeNodeAsUniquePtr(fuzzed_data_provider, steady_clock, i).release());

        CNode& p2p_node = *peers.back();

        FillNode(fuzzed_data_provider, connman, p2p_node);

        connman.AddTestNode(p2p_node);

    }

    LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 30)

    {

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

        clock.set(ConsumeTime(fuzzed_data_provider));

        CSerializedNetMsg net_msg;

        net_msg.m_type = random_message_type;

        net_msg.data = ConsumeRandomLengthByteVector(fuzzed_data_provider, MAX_PROTOCOL_MESSAGE_LENGTH);

        CNode& random_node = *PickValue(fuzzed_data_provider, peers);

        connman.FlushSendBuffer(random_node);

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

        bool more_work{true};

        while (more_work) { // Ensure that every message is eventually processed in some way or another

  Branch (126:16): [True: 0, False: 0]

            random_node.fPauseSend = false;

            try {

                more_work = connman.ProcessMessagesOnce(random_node);

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

            }

            node.peerman->SendMessages(random_node);

        }

    }

    node.validation_signals->SyncWithValidationInterfaceQueue();

    node.validation_signals->UnregisterValidationInterface(node.peerman.get());

    node.connman->StopNodes();

    if (block_index_size != WITH_LOCK(chainman.GetMutex(), return chainman.BlockIndex().size())) {

  Branch (139:9): [True: 0, False: 0]

        // Reuse the global chainman, but reset it when it is dirty

        ResetChainman(*g_setup);

    }

}