// Copyright (c) 2025 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 <blockencodings.h>

#include <streams.h>

#include <random.h>

#include <test/fuzz/fuzz.h>

#include <vector>

FUZZ_TARGET(difference_formatter)

{

    const auto block_hash = InsecureRandomContext{{}}.rand256();

    DataStream ss{};

    ss << block_hash << std::span{buffer};

    // Test deserialization

    try {

        BlockTransactionsRequest test_container;

        ss >> test_container;

        assert(test_container.blockhash == block_hash);

        // Invariant: strictly monotonic increasing (no duplicates allowed)

        for (size_t i = 1; i < test_container.indexes.size(); ++i) {

            assert(test_container.indexes[i] > test_container.indexes[i-1]);

        }

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

        // Expected for malformed input

    }

}