// 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 <pubkey.h>

#include <script/descriptor.h>

#include <test/fuzz/FuzzedDataProvider.h>

#include <test/fuzz/fuzz.h>

#include <test/fuzz/util.h>

#include <cstdint>

#include <optional>

#include <string>

#include <vector>

FUZZ_TARGET(script_descriptor_cache)

{

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

    DescriptorCache descriptor_cache;

    LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000) {

        const std::vector<uint8_t> code = fuzzed_data_provider.ConsumeBytes<uint8_t>(BIP32_EXTKEY_SIZE);

        if (code.size() == BIP32_EXTKEY_SIZE) {

            CExtPubKey xpub;

            xpub.Decode(code.data());

            const uint32_t key_exp_pos = fuzzed_data_provider.ConsumeIntegral<uint32_t>();

            CExtPubKey xpub_fetched;

            if (fuzzed_data_provider.ConsumeBool()) {

                (void)descriptor_cache.GetCachedParentExtPubKey(key_exp_pos, xpub_fetched);

                descriptor_cache.CacheParentExtPubKey(key_exp_pos, xpub);

                assert(descriptor_cache.GetCachedParentExtPubKey(key_exp_pos, xpub_fetched));

            } else {

                const uint32_t der_index = fuzzed_data_provider.ConsumeIntegral<uint32_t>();

                (void)descriptor_cache.GetCachedDerivedExtPubKey(key_exp_pos, der_index, xpub_fetched);

                descriptor_cache.CacheDerivedExtPubKey(key_exp_pos, der_index, xpub);

                assert(descriptor_cache.GetCachedDerivedExtPubKey(key_exp_pos, der_index, xpub_fetched));

            }

            assert(xpub == xpub_fetched);

        }

        (void)descriptor_cache.GetCachedParentExtPubKeys();

        (void)descriptor_cache.GetCachedDerivedExtPubKeys();

    }

}