// Copyright (c) 2024-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_WALLET_H
#define BITCOIN_TEST_FUZZ_UTIL_WALLET_H

#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <policy/policy.h>
#include <wallet/coincontrol.h>
#include <wallet/fees.h>
#include <wallet/spend.h>
#include <wallet/test/util.h>
#include <wallet/wallet.h>

namespace wallet {

/**
 * Wraps a descriptor wallet for fuzzing.
 */
struct FuzzedWallet {
    std::shared_ptr<CWallet> wallet;
    FuzzedWallet(interfaces::Chain& chain, const std::string& name, const std::string& seed_insecure)
    {
        wallet = std::make_shared<CWallet>(&chain, name, CreateMockableWalletDatabase());
        {
            LOCK(wallet->cs_wallet);
            wallet->SetWalletFlag(WALLET_FLAG_DESCRIPTORS);
            auto height{*Assert(chain.getHeight())};
            wallet->SetLastBlockProcessed(height, chain.getBlockHash(height));
        }
        wallet->m_keypool_size = 1; // Avoid timeout in TopUp()
        assert(wallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
        ImportDescriptors(seed_insecure);
    }
    void ImportDescriptors(const std::string& seed_insecure)
    {
        const std::vector<std::string> DESCS{
            "pkh(%s/%s/*)",
            "sh(wpkh(%s/%s/*))",
            "tr(%s/%s/*)",
            "wpkh(%s/%s/*)",
        };

        for (const std::string& desc_fmt : DESCS) {
            for (bool internal : {true, false}) {
                const auto descriptor{strprintf(tfm::RuntimeFormat{desc_fmt}, "[5aa9973a/66h/4h/2h]" + seed_insecure, int{internal})};

                FlatSigningProvider keys;
                std::string error;
                auto parsed_desc = std::move(Parse(descriptor, keys, error, /*require_checksum=*/false).at(0));
                assert(parsed_desc);
                assert(error.empty());
                assert(parsed_desc->IsRange());
                assert(parsed_desc->IsSingleType());
                assert(!keys.keys.empty());
                WalletDescriptor w_desc{std::move(parsed_desc), /*creation_time=*/0, /*range_start=*/0, /*range_end=*/1, /*next_index=*/0};
                assert(!wallet->GetDescriptorScriptPubKeyMan(w_desc));
                LOCK(wallet->cs_wallet);
                auto& spk_manager = Assert(wallet->AddWalletDescriptor(w_desc, keys, /*label=*/"", internal))->get();
                wallet->AddActiveScriptPubKeyMan(spk_manager.GetID(), *Assert(w_desc.descriptor->GetOutputType()), internal);
            }
        }
    }
    CTxDestination GetDestination(FuzzedDataProvider& fuzzed_data_provider)
    {
        auto type{fuzzed_data_provider.PickValueInArray(OUTPUT_TYPES)};
        if (fuzzed_data_provider.ConsumeBool()) {
            return *Assert(wallet->GetNewDestination(type, ""));
        } else {
            return *Assert(wallet->GetNewChangeDestination(type));
        }
    }
    CScript GetScriptPubKey(FuzzedDataProvider& fuzzed_data_provider) { return GetScriptForDestination(GetDestination(fuzzed_data_provider)); }
};
}

#endif // BITCOIN_TEST_FUZZ_UTIL_WALLET_H