// 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.

#include <test/fuzz/FuzzedDataProvider.h>

#include <test/fuzz/fuzz.h>

#include <test/fuzz/util.h>

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

#include <test/util/random.h>

#include <test/util/setup_common.h>

#include <util/time.h>

#include <wallet/coincontrol.h>

#include <wallet/context.h>

#include <wallet/spend.h>

#include <wallet/test/util.h>

#include <wallet/wallet.h>

#include <validation.h>

#include <addresstype.h>

using util::ToString;

namespace wallet {

namespace {

const TestingSetup* g_setup;

void initialize_setup()

{

    static const auto testing_setup = MakeNoLogFileContext<const TestingSetup>();

    g_setup = testing_setup.get();

}

FUZZ_TARGET(wallet_create_transaction, .init = initialize_setup)

{

    SeedRandomStateForTest(SeedRand::ZEROS);

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

    SetMockTime(ConsumeTime(fuzzed_data_provider));

    const auto& node = g_setup->m_node;

    Chainstate& chainstate{node.chainman->ActiveChainstate()};

    ArgsManager& args = *node.args;

    args.ForceSetArg("-dustrelayfee", ToString(fuzzed_data_provider.ConsumeIntegralInRange<CAmount>(0, MAX_MONEY)));

    FuzzedWallet fuzzed_wallet{

        *g_setup->m_node.chain,

        "fuzzed_wallet_a",

        "tprv8ZgxMBicQKsPd1QwsGgzfu2pcPYbBosZhJknqreRHgsWx32nNEhMjGQX2cgFL8n6wz9xdDYwLcs78N4nsCo32cxEX8RBtwGsEGgybLiQJfk",

    };

    CCoinControl coin_control;

    if (fuzzed_data_provider.ConsumeBool()) coin_control.m_version = fuzzed_data_provider.ConsumeIntegral<unsigned int>();

    coin_control.m_avoid_partial_spends = fuzzed_data_provider.ConsumeBool();

    coin_control.m_include_unsafe_inputs = fuzzed_data_provider.ConsumeBool();

    if (fuzzed_data_provider.ConsumeBool()) coin_control.m_confirm_target = fuzzed_data_provider.ConsumeIntegralInRange<unsigned int>(0, 999'000);

    coin_control.destChange = fuzzed_data_provider.ConsumeBool() ? fuzzed_wallet.GetDestination(fuzzed_data_provider) : ConsumeTxDestination(fuzzed_data_provider);

    if (fuzzed_data_provider.ConsumeBool()) coin_control.m_change_type = fuzzed_data_provider.PickValueInArray(OUTPUT_TYPES);

    if (fuzzed_data_provider.ConsumeBool()) coin_control.m_feerate = CFeeRate(ConsumeMoney(fuzzed_data_provider, /*max=*/COIN));

    coin_control.m_allow_other_inputs = fuzzed_data_provider.ConsumeBool();

    coin_control.m_locktime = fuzzed_data_provider.ConsumeIntegral<unsigned int>();

    coin_control.fOverrideFeeRate = fuzzed_data_provider.ConsumeBool();

    int next_locktime{0};

    CAmount all_values{0};

    LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 10000)

    {

        CMutableTransaction tx;

        tx.nLockTime = next_locktime++;

        tx.vout.resize(1);

        CAmount n_value{ConsumeMoney(fuzzed_data_provider)};

        all_values += n_value;

        if (all_values > MAX_MONEY) return;

        tx.vout[0].nValue = n_value;

        tx.vout[0].scriptPubKey = GetScriptForDestination(fuzzed_wallet.GetDestination(fuzzed_data_provider));

        LOCK(fuzzed_wallet.wallet->cs_wallet);

        auto txid{tx.GetHash()};

        auto ret{fuzzed_wallet.wallet->mapWallet.emplace(std::piecewise_construct, std::forward_as_tuple(txid), std::forward_as_tuple(MakeTransactionRef(std::move(tx)), TxStateConfirmed{chainstate.m_chain.Tip()->GetBlockHash(), chainstate.m_chain.Height(), /*index=*/0}))};

        assert(ret.second);

    }

    std::vector<CRecipient> recipients;

    LIMITED_WHILE(fuzzed_data_provider.ConsumeBool(), 100) {

        CTxDestination destination;

        CallOneOf(

            fuzzed_data_provider,

            [&] {

                destination = fuzzed_wallet.GetDestination(fuzzed_data_provider);

            },

            [&] {

                CScript script;

                script << OP_RETURN;

                destination = CNoDestination{script};

            },

            [&] {

                destination = ConsumeTxDestination(fuzzed_data_provider);

            }

        );

        recipients.push_back({destination,

                              /*nAmount=*/ConsumeMoney(fuzzed_data_provider),

                              /*fSubtractFeeFromAmount=*/fuzzed_data_provider.ConsumeBool()});

    }

    std::optional<unsigned int> change_pos;

    if (fuzzed_data_provider.ConsumeBool()) change_pos = fuzzed_data_provider.ConsumeIntegral<unsigned int>();

    (void)CreateTransaction(*fuzzed_wallet.wallet, recipients, change_pos, coin_control);

}

} // namespace

} // namespace wallet