// 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 <net.h>

#include <protocol.h>

#include <test/fuzz/FuzzedDataProvider.h>

#include <test/fuzz/fuzz.h>

#include <test/fuzz/util.h>

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

#include <algorithm>

#include <cassert>

#include <cstdint>

#include <optional>

#include <vector>

FUZZ_TARGET(node_eviction)

{

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

    std::vector<NodeEvictionCandidate> eviction_candidates;

    LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {

        eviction_candidates.push_back({

            /*id=*/fuzzed_data_provider.ConsumeIntegral<NodeId>(),

            /*m_connected=*/std::chrono::seconds{fuzzed_data_provider.ConsumeIntegral<int64_t>()},

            /*m_min_ping_time=*/std::chrono::microseconds{fuzzed_data_provider.ConsumeIntegral<int64_t>()},

            /*m_last_block_time=*/std::chrono::seconds{fuzzed_data_provider.ConsumeIntegral<int64_t>()},

            /*m_last_tx_time=*/std::chrono::seconds{fuzzed_data_provider.ConsumeIntegral<int64_t>()},

            /*fRelevantServices=*/fuzzed_data_provider.ConsumeBool(),

            /*m_relay_txs=*/fuzzed_data_provider.ConsumeBool(),

            /*fBloomFilter=*/fuzzed_data_provider.ConsumeBool(),

            /*nKeyedNetGroup=*/fuzzed_data_provider.ConsumeIntegral<uint64_t>(),

            /*prefer_evict=*/fuzzed_data_provider.ConsumeBool(),

            /*m_is_local=*/fuzzed_data_provider.ConsumeBool(),

            /*m_network=*/fuzzed_data_provider.PickValueInArray(ALL_NETWORKS),

            /*m_noban=*/fuzzed_data_provider.ConsumeBool(),

            /*m_conn_type=*/fuzzed_data_provider.PickValueInArray(ALL_CONNECTION_TYPES),

        });

    }

    // Make a copy since eviction_candidates may be in some valid but otherwise

    // indeterminate state after the SelectNodeToEvict(&&) call.

    const std::vector<NodeEvictionCandidate> eviction_candidates_copy = eviction_candidates;

    const std::optional<NodeId> node_to_evict = SelectNodeToEvict(std::move(eviction_candidates));

    if (node_to_evict) {

        assert(std::any_of(eviction_candidates_copy.begin(), eviction_candidates_copy.end(), [&node_to_evict](const NodeEvictionCandidate& eviction_candidate) { return *node_to_evict == eviction_candidate.id; }));

    }

}