// Copyright (c) 2020-2022 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 <chain.h>

#include <test/fuzz/FuzzedDataProvider.h>

#include <test/fuzz/fuzz.h>

#include <test/fuzz/util.h>

#include <cstdint>

#include <optional>

#include <vector>

FUZZ_TARGET(chain)

{

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

    std::optional<CDiskBlockIndex> disk_block_index = ConsumeDeserializable<CDiskBlockIndex>(fuzzed_data_provider);

    if (!disk_block_index) {

        return;

    }

    const uint256 zero{};

    disk_block_index->phashBlock = &zero;

    {

        LOCK(::cs_main);

        (void)disk_block_index->ConstructBlockHash();

        (void)disk_block_index->GetBlockPos();

        (void)disk_block_index->GetBlockTime();

        (void)disk_block_index->GetBlockTimeMax();

        (void)disk_block_index->GetMedianTimePast();

        (void)disk_block_index->GetUndoPos();

        (void)disk_block_index->HaveNumChainTxs();

        (void)disk_block_index->IsValid();

    }

    const CBlockHeader block_header = disk_block_index->GetBlockHeader();

    (void)CDiskBlockIndex{*disk_block_index};

    (void)disk_block_index->BuildSkip();

    LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {

        const BlockStatus block_status = fuzzed_data_provider.PickValueInArray({

            BlockStatus::BLOCK_VALID_UNKNOWN,

            BlockStatus::BLOCK_VALID_RESERVED,

            BlockStatus::BLOCK_VALID_TREE,

            BlockStatus::BLOCK_VALID_TRANSACTIONS,

            BlockStatus::BLOCK_VALID_CHAIN,

            BlockStatus::BLOCK_VALID_SCRIPTS,

            BlockStatus::BLOCK_VALID_MASK,

            BlockStatus::BLOCK_HAVE_DATA,

            BlockStatus::BLOCK_HAVE_UNDO,

            BlockStatus::BLOCK_HAVE_MASK,

            BlockStatus::BLOCK_FAILED_VALID,

            BlockStatus::BLOCK_FAILED_CHILD,

            BlockStatus::BLOCK_FAILED_MASK,

            BlockStatus::BLOCK_OPT_WITNESS,

        });

        if (block_status & ~BLOCK_VALID_MASK) {

            continue;

        }

        WITH_LOCK(::cs_main, (void)disk_block_index->RaiseValidity(block_status));

    }

    CBlockIndex block_index{block_header};

    block_index.phashBlock = &zero;

    (void)block_index.GetBlockHash();

    (void)block_index.ToString();

}