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// Copyright (c) 2023-present The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_TEST_FUZZ_UTIL_DESCRIPTOR_H
#define BITCOIN_TEST_FUZZ_UTIL_DESCRIPTOR_H
#include <key_io.h>
#include <util/strencodings.h>
#include <script/descriptor.h>
#include <test/fuzz/fuzz.h>
#include <functional>
/**
* Converts a mocked descriptor string to a valid one. Every key in a mocked descriptor key is
* represented by 2 hex characters preceded by the '%' character. We parse the two hex characters
* as an index in a list of pre-generated keys. This list contains keys of the various types
* accepted in descriptor keys expressions.
*/
class MockedDescriptorConverter {
private:
//! Types are raw (un)compressed pubkeys, raw xonly pubkeys, raw privkeys (WIF), xpubs, xprvs.
static constexpr uint8_t KEY_TYPES_COUNT{6};
//! How many keys we'll generate in total.
static constexpr size_t TOTAL_KEYS_GENERATED{std::numeric_limits<uint8_t>::max() + 1};
//! 256 keys of various types.
std::array<std::string, TOTAL_KEYS_GENERATED> keys_str;
public:
// We derive the type of key to generate from the 1-byte id parsed from hex.
bool IdIsCompPubKey(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 0; }
bool IdIsUnCompPubKey(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 1; }
bool IdIsXOnlyPubKey(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 2; }
bool IdIsConstPrivKey(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 3; }
bool IdIsXpub(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 4; }
bool IdIsXprv(uint8_t idx) const { return idx % KEY_TYPES_COUNT == 5; }
//! When initializing the target, populate the list of keys.
void Init();
//! Parse an id in the keys vectors from a 2-characters hex string.
std::optional<uint8_t> IdxFromHex(std::string_view hex_characters) const;
//! Get an actual descriptor string from a descriptor string whose keys were mocked.
std::optional<std::string> GetDescriptor(std::string_view mocked_desc) const;
};
//! Default maximum number of derivation indexes in a single derivation path when limiting its depth.
constexpr int MAX_DEPTH{2};
/**
* Whether the buffer, if it represents a valid descriptor, contains a derivation path deeper than
* a given maximum depth. Note this may also be hit for deriv paths in origins.
*/
bool HasDeepDerivPath(const FuzzBufferType& buff, const int max_depth = MAX_DEPTH);
#endif // BITCOIN_TEST_FUZZ_UTIL_DESCRIPTOR_H
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