// Copyright (c) 2020-2021 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 <chainparams.h>

#include <clientversion.h>

#include <flatfile.h>

#include <test/fuzz/FuzzedDataProvider.h>

#include <test/fuzz/fuzz.h>

#include <test/fuzz/util.h>

#include <test/util/setup_common.h>

#include <util/time.h>

#include <validation.h>

#include <cstdint>

#include <vector>

namespace {

const TestingSetup* g_setup;

} // namespace

void initialize_load_external_block_file()

{

    static const auto testing_setup = MakeNoLogFileContext<const TestingSetup>();

    g_setup = testing_setup.get();

}

FUZZ_TARGET(load_external_block_file, .init = initialize_load_external_block_file)

{

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

    SetMockTime(ConsumeTime(fuzzed_data_provider));

    FuzzedFileProvider fuzzed_file_provider{fuzzed_data_provider};

    AutoFile fuzzed_block_file{fuzzed_file_provider.open()};

    if (fuzzed_block_file.IsNull()) {

        return;

    }

    if (fuzzed_data_provider.ConsumeBool()) {

        // Corresponds to the -reindex case (track orphan blocks across files).

        FlatFilePos flat_file_pos;

        std::multimap<uint256, FlatFilePos> blocks_with_unknown_parent;

        g_setup->m_node.chainman->LoadExternalBlockFile(fuzzed_block_file, &flat_file_pos, &blocks_with_unknown_parent);

    } else {

        // Corresponds to the -loadblock= case (orphan blocks aren't tracked across files).

        g_setup->m_node.chainman->LoadExternalBlockFile(fuzzed_block_file);

    }

}