// Copyright (c) 2011-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 <common/messages.h>

#include <consensus/validation.h>

#include <core_io.h>

#include <key_io.h>

#include <node/types.h>

#include <policy/policy.h>

#include <policy/truc_policy.h>

#include <rpc/rawtransaction_util.h>

#include <rpc/util.h>

#include <script/script.h>

#include <util/rbf.h>

#include <util/translation.h>

#include <util/vector.h>

#include <wallet/coincontrol.h>

#include <wallet/feebumper.h>

#include <wallet/fees.h>

#include <wallet/rpc/util.h>

#include <wallet/spend.h>

#include <wallet/wallet.h>

#include <univalue.h>

using common::FeeModeFromString;

using common::FeeModesDetail;

using common::InvalidEstimateModeErrorMessage;

using common::StringForFeeReason;

using common::TransactionErrorString;

using node::TransactionError;

namespace wallet {

std::vector<CRecipient> CreateRecipients(const std::vector<std::pair<CTxDestination, CAmount>>& outputs, const std::set<int>& subtract_fee_outputs)

{

    std::vector<CRecipient> recipients;

    for (size_t i = 0; i < outputs.size(); ++i) {

        const auto& [destination, amount] = outputs.at(i);

        CRecipient recipient{destination, amount, subtract_fee_outputs.contains(i)};

        recipients.push_back(recipient);

    }

    return recipients;

}

static void InterpretFeeEstimationInstructions(const UniValue& conf_target, const UniValue& estimate_mode, const UniValue& fee_rate, UniValue& options)

{

    if (options.exists("conf_target") || options.exists("estimate_mode")) {

        if (!conf_target.isNull() || !estimate_mode.isNull()) {

            throw JSONRPCError(RPC_INVALID_PARAMETER, "Pass conf_target and estimate_mode either as arguments or in the options object, but not both");

        }

    } else {

        options.pushKV("conf_target", conf_target);

        options.pushKV("estimate_mode", estimate_mode);

    }

    if (options.exists("fee_rate")) {

        if (!fee_rate.isNull()) {

            throw JSONRPCError(RPC_INVALID_PARAMETER, "Pass the fee_rate either as an argument, or in the options object, but not both");

        }

    } else {

        options.pushKV("fee_rate", fee_rate);

    }

    if (!options["conf_target"].isNull() && (options["estimate_mode"].isNull() || (options["estimate_mode"].get_str() == "unset"))) {

        throw JSONRPCError(RPC_INVALID_PARAMETER, "Specify estimate_mode");

    }

}

std::set<int> InterpretSubtractFeeFromOutputInstructions(const UniValue& sffo_instructions, const std::vector<std::string>& destinations)

{

    std::set<int> sffo_set;

    if (sffo_instructions.isNull()) return sffo_set;

    for (const auto& sffo : sffo_instructions.getValues()) {

        int pos{-1};

        if (sffo.isStr()) {

            auto it = find(destinations.begin(), destinations.end(), sffo.get_str());

            if (it == destinations.end()) throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Invalid parameter 'subtract fee from output', destination %s not found in tx outputs", sffo.get_str()));

            pos = it - destinations.begin();

        } else if (sffo.isNum()) {

            pos = sffo.getInt<int>();

        } else {

            throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Invalid parameter 'subtract fee from output', invalid value type: %s", uvTypeName(sffo.type())));

        }

        if (sffo_set.contains(pos))

            throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Invalid parameter 'subtract fee from output', duplicated position: %d", pos));

        if (pos < 0)

            throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Invalid parameter 'subtract fee from output', negative position: %d", pos));

        if (pos >= int(destinations.size()))

            throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Invalid parameter 'subtract fee from output', position too large: %d", pos));

        sffo_set.insert(pos);

    }

    return sffo_set;

}

static UniValue FinishTransaction(const std::shared_ptr<CWallet> pwallet, const UniValue& options, CMutableTransaction& rawTx)

{

    bool can_anti_fee_snipe = !options.exists("locktime");

    for (const CTxIn& tx_in : rawTx.vin) {

        // Checks sequence values consistent with DiscourageFeeSniping

        can_anti_fee_snipe = can_anti_fee_snipe && (tx_in.nSequence == CTxIn::MAX_SEQUENCE_NONFINAL || tx_in.nSequence == MAX_BIP125_RBF_SEQUENCE);

    }

    if (can_anti_fee_snipe) {

        LOCK(pwallet->cs_wallet);

        FastRandomContext rng_fast;

        DiscourageFeeSniping(rawTx, rng_fast, pwallet->chain(), pwallet->GetLastBlockHash(), pwallet->GetLastBlockHeight());

    }

    // Make a blank psbt

    PartiallySignedTransaction psbtx(rawTx, /*version=*/2);

    // First fill transaction with our data without signing,

    // so external signers are not asked to sign more than once.

    bool complete;

    pwallet->FillPSBT(psbtx, {.sign = false, .bip32_derivs = true}, complete);

    const auto err{pwallet->FillPSBT(psbtx, {.sign = true, .bip32_derivs = false}, complete)};

    if (err) {

        throw JSONRPCPSBTError(*err);

    }

    CMutableTransaction mtx;

    complete = FinalizeAndExtractPSBT(psbtx, mtx);

    UniValue result(UniValue::VOBJ);

    const bool psbt_opt_in{options.exists("psbt") && options["psbt"].get_bool()};

    bool add_to_wallet{options.exists("add_to_wallet") ? options["add_to_wallet"].get_bool() : true};

    if (psbt_opt_in || !complete || !add_to_wallet) {

        // Serialize the PSBT

        DataStream ssTx{};

        ssTx << psbtx;

        result.pushKV("psbt", EncodeBase64(ssTx.str()));

    }

    if (complete) {

        std::string hex{EncodeHexTx(CTransaction(mtx))};

        CTransactionRef tx(MakeTransactionRef(std::move(mtx)));

        result.pushKV("txid", tx->GetHash().GetHex());

        if (add_to_wallet && !psbt_opt_in) {

            pwallet->CommitTransaction(tx, {}, /*orderForm=*/{});

        } else {

            result.pushKV("hex", hex);

        }

    }

    result.pushKV("complete", complete);

    return result;

}

static void PreventOutdatedOptions(const UniValue& options)

{

    if (options.exists("feeRate")) {

        throw JSONRPCError(RPC_INVALID_PARAMETER, "Use fee_rate (" + CURRENCY_ATOM + "/vB) instead of feeRate");

    }

    if (options.exists("changeAddress")) {

        throw JSONRPCError(RPC_INVALID_PARAMETER, "Use change_address instead of changeAddress");

    }

    if (options.exists("changePosition")) {

        throw JSONRPCError(RPC_INVALID_PARAMETER, "Use change_position instead of changePosition");

    }

    if (options.exists("lockUnspents")) {

        throw JSONRPCError(RPC_INVALID_PARAMETER, "Use lock_unspents instead of lockUnspents");

    }

    if (options.exists("subtractFeeFromOutputs")) {

        throw JSONRPCError(RPC_INVALID_PARAMETER, "Use subtract_fee_from_outputs instead of subtractFeeFromOutputs");

    }

}

UniValue SendMoney(CWallet& wallet, const CCoinControl &coin_control, std::vector<CRecipient> &recipients, mapValue_t map_value, bool verbose)

{

    EnsureWalletIsUnlocked(wallet);

    // This function is only used by sendtoaddress and sendmany.

    // This should always try to sign, if we don't have private keys, don't try to do anything here.

    if (wallet.IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {

        throw JSONRPCError(RPC_WALLET_ERROR, "Error: Private keys are disabled for this wallet");

    }

    // Shuffle recipient list

    std::shuffle(recipients.begin(), recipients.end(), FastRandomContext());

    // Send

    auto res = CreateTransaction(wallet, recipients, /*change_pos=*/std::nullopt, coin_control, true);

    if (!res) {

        throw JSONRPCError(RPC_WALLET_INSUFFICIENT_FUNDS, util::ErrorString(res).original);

    }

    const CTransactionRef& tx = res->tx;

    wallet.CommitTransaction(tx, std::move(map_value), /*orderForm=*/{});

    if (verbose) {

        UniValue entry(UniValue::VOBJ);

        entry.pushKV("txid", tx->GetHash().GetHex());

        entry.pushKV("fee_reason", StringForFeeReason(res->fee_calc.reason));

        return entry;

    }

    return tx->GetHash().GetHex();

}

/**

 * Update coin control with fee estimation based on the given parameters

 *

 * @param[in]     wallet            Wallet reference

 * @param[in,out] cc                Coin control to be updated

 * @param[in]     conf_target       UniValue integer; confirmation target in blocks, values between 1 and 1008 are valid per policy/fees/block_policy_estimator.h;

 * @param[in]     estimate_mode     UniValue string; fee estimation mode, valid values are "unset", "economical" or "conservative";

 * @param[in]     fee_rate          UniValue real; fee rate in sat/vB;

 *                                      if present, both conf_target and estimate_mode must either be null, or "unset"

 * @param[in]     override_min_fee  bool; whether to set fOverrideFeeRate to true to disable minimum fee rate checks and instead

 *                                      verify only that fee_rate is greater than 0

 * @throws a JSONRPCError if conf_target, estimate_mode, or fee_rate contain invalid values or are in conflict

 */

static void SetFeeEstimateMode(const CWallet& wallet, CCoinControl& cc, const UniValue& conf_target, const UniValue& estimate_mode, const UniValue& fee_rate, bool override_min_fee)

{

    if (!fee_rate.isNull()) {

        if (!conf_target.isNull()) {

            throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot specify both conf_target and fee_rate. Please provide either a confirmation target in blocks for automatic fee estimation, or an explicit fee rate.");

        }

        if (!estimate_mode.isNull() && estimate_mode.get_str() != "unset") {

            throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot specify both estimate_mode and fee_rate");

        }

        // Fee rates in sat/vB cannot represent more than 3 significant digits.

        cc.m_feerate = CFeeRate{AmountFromValue(fee_rate, /*decimals=*/3)};

        if (override_min_fee) cc.fOverrideFeeRate = true;

        // Default RBF to true for explicit fee_rate, if unset.

        if (!cc.m_signal_bip125_rbf) cc.m_signal_bip125_rbf = true;

        return;

    }

    if (!estimate_mode.isNull() && !FeeModeFromString(estimate_mode.get_str(), cc.m_fee_mode)) {

        throw JSONRPCError(RPC_INVALID_PARAMETER, InvalidEstimateModeErrorMessage());

    }

    if (!conf_target.isNull()) {

        cc.m_confirm_target = ParseConfirmTarget(conf_target, wallet.chain().estimateMaxBlocks());

    }

}

RPCMethod sendtoaddress()

{

    return RPCMethod{

        "sendtoaddress",

        "Send an amount to a given address." +

        HELP_REQUIRING_PASSPHRASE,

                {

                    {"address", RPCArg::Type::STR, RPCArg::Optional::NO, "The bitcoin address to send to."},

                    {"amount", RPCArg::Type::AMOUNT, RPCArg::Optional::NO, "The amount in " + CURRENCY_UNIT + " to send. eg 0.1"},

                    {"comment", RPCArg::Type::STR, RPCArg::Optional::OMITTED, "A comment used to store what the transaction is for.\n"

                                         "This is not part of the transaction, just kept in your wallet."},

                    {"comment_to", RPCArg::Type::STR, RPCArg::Optional::OMITTED, "A comment to store the name of the person or organization\n"

                                         "to which you're sending the transaction. This is not part of the \n"

                                         "transaction, just kept in your wallet."},

                    {"subtractfeefromamount", RPCArg::Type::BOOL, RPCArg::Default{false}, "The fee will be deducted from the amount being sent.\n"

                                         "The recipient will receive less bitcoins than you enter in the amount field."},

                    {"replaceable", RPCArg::Type::BOOL, RPCArg::DefaultHint{"wallet default"}, "Signal that this transaction can be replaced by a transaction (BIP 125)"},

                    {"conf_target", RPCArg::Type::NUM, RPCArg::DefaultHint{"wallet -txconfirmtarget"}, "Confirmation target in blocks"},

                    {"estimate_mode", RPCArg::Type::STR, RPCArg::Default{"unset"}, "The fee estimate mode, must be one of (case insensitive):\n"

                      + FeeModesDetail(std::string("economical mode is used if the transaction is replaceable;\notherwise, conservative mode is used"))},

                    {"avoid_reuse", RPCArg::Type::BOOL, RPCArg::Default{true}, "(only available if avoid_reuse wallet flag is set) Avoid spending from dirty addresses; addresses are considered\n"

                                         "dirty if they have previously been used in a transaction. If true, this also activates avoidpartialspends, grouping outputs by their addresses."},

                    {"fee_rate", RPCArg::Type::AMOUNT, RPCArg::DefaultHint{"not set, fall back to wallet fee estimation"}, "Specify a fee rate in " + CURRENCY_ATOM + "/vB."},

                    {"verbose", RPCArg::Type::BOOL, RPCArg::Default{false}, "If true, return extra information about the transaction."},

                },

                {

                    RPCResult{"if verbose is not set or set to false",

                        RPCResult::Type::STR_HEX, "txid", "The transaction id."

                    },

                    RPCResult{"if verbose is set to true",

                        RPCResult::Type::OBJ, "", "",

                        {

                            {RPCResult::Type::STR_HEX, "txid", "The transaction id."},

                            {RPCResult::Type::STR, "fee_reason", "The transaction fee reason."}

                        },

                    },

                },

                RPCExamples{

                    "\nSend 0.1 BTC\n"

                    + HelpExampleCli("sendtoaddress", "\"" + EXAMPLE_ADDRESS[0] + "\" 0.1") +

                    "\nSend 0.1 BTC with a confirmation target of 6 blocks in economical fee estimate mode using positional arguments\n"

                    + HelpExampleCli("sendtoaddress", "\"" + EXAMPLE_ADDRESS[0] + "\" 0.1 \"donation\" \"sean's outpost\" false true 6 economical") +

                    "\nSend 0.1 BTC with a fee rate of 1.1 " + CURRENCY_ATOM + "/vB, subtract fee from amount, BIP125-replaceable, using positional arguments\n"

                    + HelpExampleCli("sendtoaddress", "\"" + EXAMPLE_ADDRESS[0] + "\" 0.1 \"drinks\" \"room77\" true true null \"unset\" null 1.1") +

                    "\nSend 0.2 BTC with a confirmation target of 6 blocks in economical fee estimate mode using named arguments\n"

                    + HelpExampleCli("-named sendtoaddress", "address=\"" + EXAMPLE_ADDRESS[0] + "\" amount=0.2 conf_target=6 estimate_mode=\"economical\"") +

                    "\nSend 0.5 BTC with a fee rate of 25 " + CURRENCY_ATOM + "/vB using named arguments\n"

                    + HelpExampleCli("-named sendtoaddress", "address=\"" + EXAMPLE_ADDRESS[0] + "\" amount=0.5 fee_rate=25")

                    + HelpExampleCli("-named sendtoaddress", "address=\"" + EXAMPLE_ADDRESS[0] + "\" amount=0.5 fee_rate=25 subtractfeefromamount=false replaceable=true avoid_reuse=true comment=\"2 pizzas\" comment_to=\"jeremy\" verbose=true")

                },

        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue

{

    std::shared_ptr<CWallet> const pwallet = GetWalletForJSONRPCRequest(request);

    if (!pwallet) return UniValue::VNULL;

    // Make sure the results are valid at least up to the most recent block

    // the user could have gotten from another RPC command prior to now

    pwallet->BlockUntilSyncedToCurrentChain();

    LOCK(pwallet->cs_wallet);

    // Wallet comments

    mapValue_t mapValue;

    if (!request.params[2].isNull() && !request.params[2].get_str().empty())

        mapValue["comment"] = request.params[2].get_str();

    if (!request.params[3].isNull() && !request.params[3].get_str().empty())

        mapValue["to"] = request.params[3].get_str();

    CCoinControl coin_control;

    if (!request.params[5].isNull()) {

        coin_control.m_signal_bip125_rbf = request.params[5].get_bool();

    }

    coin_control.m_avoid_address_reuse = GetAvoidReuseFlag(*pwallet, request.params[8]);

    // We also enable partial spend avoidance if reuse avoidance is set.

    coin_control.m_avoid_partial_spends |= coin_control.m_avoid_address_reuse;

    SetFeeEstimateMode(*pwallet, coin_control, /*conf_target=*/request.params[6], /*estimate_mode=*/request.params[7], /*fee_rate=*/request.params[9], /*override_min_fee=*/false);

    EnsureWalletIsUnlocked(*pwallet);

    UniValue address_amounts(UniValue::VOBJ);

    const std::string address = request.params[0].get_str();

    address_amounts.pushKV(address, request.params[1]);

    std::set<int> sffo_set;

    if (!request.params[4].isNull() && request.params[4].get_bool()) {

        sffo_set.insert(0);

    }

    std::vector<CRecipient> recipients{CreateRecipients(ParseOutputs(address_amounts), sffo_set)};

    const bool verbose{request.params[10].isNull() ? false : request.params[10].get_bool()};

    return SendMoney(*pwallet, coin_control, recipients, mapValue, verbose);

},

    };

}

RPCMethod sendmany()

{

    return RPCMethod{"sendmany",

        "Send multiple times. Amounts are double-precision floating point numbers." +

        HELP_REQUIRING_PASSPHRASE,

                {

                    {"dummy", RPCArg::Type::STR, RPCArg::Default{"\"\""}, "Must be set to \"\" for backwards compatibility.",

                     RPCArgOptions{

                         .oneline_description = "\"\"",

                     }},

                    {"amounts", RPCArg::Type::OBJ_USER_KEYS, RPCArg::Optional::NO, "The addresses and amounts",

                        {

                            {"address", RPCArg::Type::AMOUNT, RPCArg::Optional::NO, "The bitcoin address is the key, the numeric amount (can be string) in " + CURRENCY_UNIT + " is the value"},

                        },

                    },

                    {"minconf", RPCArg::Type::NUM, RPCArg::Optional::OMITTED, "Ignored dummy value"},

                    {"comment", RPCArg::Type::STR, RPCArg::Optional::OMITTED, "A comment"},

                    {"subtractfeefrom", RPCArg::Type::ARR, RPCArg::Optional::OMITTED, "The addresses.\n"

                                       "The fee will be equally deducted from the amount of each selected address.\n"

                                       "Those recipients will receive less bitcoins than you enter in their corresponding amount field.\n"

                                       "If no addresses are specified here, the sender pays the fee.",

                        {

                            {"address", RPCArg::Type::STR, RPCArg::Optional::OMITTED, "Subtract fee from this address"},

                        },

                    },

                    {"replaceable", RPCArg::Type::BOOL, RPCArg::DefaultHint{"wallet default"}, "Signal that this transaction can be replaced by a transaction (BIP 125)"},

                    {"conf_target", RPCArg::Type::NUM, RPCArg::DefaultHint{"wallet -txconfirmtarget"}, "Confirmation target in blocks"},

                    {"estimate_mode", RPCArg::Type::STR, RPCArg::Default{"unset"}, "The fee estimate mode, must be one of (case insensitive):\n"

                      + FeeModesDetail(std::string("economical mode is used if the transaction is replaceable;\notherwise, conservative mode is used"))},

                    {"fee_rate", RPCArg::Type::AMOUNT, RPCArg::DefaultHint{"not set, fall back to wallet fee estimation"}, "Specify a fee rate in " + CURRENCY_ATOM + "/vB."},

                    {"verbose", RPCArg::Type::BOOL, RPCArg::Default{false}, "If true, return extra information about the transaction."},

                },

                {

                    RPCResult{"if verbose is not set or set to false",

                        RPCResult::Type::STR_HEX, "txid", "The transaction id for the send. Only 1 transaction is created regardless of\n"

                "the number of addresses."

                    },

                    RPCResult{"if verbose is set to true",

                        RPCResult::Type::OBJ, "", "",

                        {

                            {RPCResult::Type::STR_HEX, "txid", "The transaction id for the send. Only 1 transaction is created regardless of\n"

                "the number of addresses."},

                            {RPCResult::Type::STR, "fee_reason", "The transaction fee reason."}

                        },

                    },

                },

                RPCExamples{

            "\nSend two amounts to two different addresses:\n"

            + HelpExampleCli("sendmany", "\"\" \"{\\\"" + EXAMPLE_ADDRESS[0] + "\\\":0.01,\\\"" + EXAMPLE_ADDRESS[1] + "\\\":0.02}\"") +

            "\nSend two amounts to two different addresses setting the confirmation and comment:\n"

            + HelpExampleCli("sendmany", "\"\" \"{\\\"" + EXAMPLE_ADDRESS[0] + "\\\":0.01,\\\"" + EXAMPLE_ADDRESS[1] + "\\\":0.02}\" 6 \"testing\"") +

            "\nSend two amounts to two different addresses, subtract fee from amount:\n"

            + HelpExampleCli("sendmany", "\"\" \"{\\\"" + EXAMPLE_ADDRESS[0] + "\\\":0.01,\\\"" + EXAMPLE_ADDRESS[1] + "\\\":0.02}\" 1 \"\" \"[\\\"" + EXAMPLE_ADDRESS[0] + "\\\",\\\"" + EXAMPLE_ADDRESS[1] + "\\\"]\"") +

            "\nAs a JSON-RPC call\n"

            + HelpExampleRpc("sendmany", "\"\", {\"" + EXAMPLE_ADDRESS[0] + "\":0.01,\"" + EXAMPLE_ADDRESS[1] + "\":0.02}, 6, \"testing\"")

                },

        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue

{

    std::shared_ptr<CWallet> const pwallet = GetWalletForJSONRPCRequest(request);

    if (!pwallet) return UniValue::VNULL;

    // Make sure the results are valid at least up to the most recent block

    // the user could have gotten from another RPC command prior to now

    pwallet->BlockUntilSyncedToCurrentChain();

    LOCK(pwallet->cs_wallet);

    if (!request.params[0].isNull() && !request.params[0].get_str().empty()) {

        throw JSONRPCError(RPC_INVALID_PARAMETER, "Dummy value must be set to \"\"");

    }

    UniValue sendTo = request.params[1].get_obj();

    mapValue_t mapValue;

    if (!request.params[3].isNull() && !request.params[3].get_str().empty())

        mapValue["comment"] = request.params[3].get_str();

    CCoinControl coin_control;

    if (!request.params[5].isNull()) {

        coin_control.m_signal_bip125_rbf = request.params[5].get_bool();

    }

    SetFeeEstimateMode(*pwallet, coin_control, /*conf_target=*/request.params[6], /*estimate_mode=*/request.params[7], /*fee_rate=*/request.params[8], /*override_min_fee=*/false);

    std::vector<CRecipient> recipients = CreateRecipients(

            ParseOutputs(sendTo),

            InterpretSubtractFeeFromOutputInstructions(request.params[4], sendTo.getKeys())

    );

    const bool verbose{request.params[9].isNull() ? false : request.params[9].get_bool()};

    return SendMoney(*pwallet, coin_control, recipients, std::move(mapValue), verbose);

},

    };

}

// Only includes key documentation where the key is snake_case in all RPC methods. MixedCase keys can be added later.

static std::vector<RPCArg> FundTxDoc(bool solving_data = true)

{

    std::vector<RPCArg> args = {

        {"conf_target", RPCArg::Type::NUM, RPCArg::DefaultHint{"wallet -txconfirmtarget"}, "Confirmation target in blocks", RPCArgOptions{.also_positional = true}},

        {"estimate_mode", RPCArg::Type::STR, RPCArg::Default{"unset"}, "The fee estimate mode, must be one of (case insensitive):\n"

          + FeeModesDetail(std::string("economical mode is used if the transaction is replaceable;\notherwise, conservative mode is used")), RPCArgOptions{.also_positional = true}},

        {

            "replaceable", RPCArg::Type::BOOL, RPCArg::DefaultHint{"wallet default"}, "Marks this transaction as BIP125-replaceable.\n"

            "Allows this transaction to be replaced by a transaction with higher fees"

        },

    };

    if (solving_data) {

        args.push_back({"solving_data", RPCArg::Type::OBJ, RPCArg::Optional::OMITTED, "Keys and scripts needed for producing a final transaction with a dummy signature.\n"

        "Used for fee estimation during coin selection.",

            {

                {

                    "pubkeys", RPCArg::Type::ARR, RPCArg::Default{UniValue::VARR}, "Public keys involved in this transaction.",

                    {

                        {"pubkey", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, "A public key"},

                    }

                },

                {

                    "scripts", RPCArg::Type::ARR, RPCArg::Default{UniValue::VARR}, "Scripts involved in this transaction.",

                    {

                        {"script", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, "A script"},

                    }

                },

                {

                    "descriptors", RPCArg::Type::ARR, RPCArg::Default{UniValue::VARR}, "Descriptors that provide solving data for this transaction.",

                    {

                        {"descriptor", RPCArg::Type::STR, RPCArg::Optional::OMITTED, "A descriptor"},

                    }

                },

            }

        });

    }

    return args;

}

CreatedTransactionResult FundTransaction(CWallet& wallet, const CMutableTransaction& tx, const std::vector<CRecipient>& recipients, const UniValue& options, CCoinControl& coinControl, bool override_min_fee)

{

    // We want to make sure tx.vout is not used now that we are passing outputs as a vector of recipients.

    // This sets us up to remove tx completely in a future PR in favor of passing the inputs directly.

    CHECK_NONFATAL(tx.vout.empty());

    // Make sure the results are valid at least up to the most recent block

    // the user could have gotten from another RPC command prior to now

    wallet.BlockUntilSyncedToCurrentChain();

    std::optional<unsigned int> change_position;

    bool lockUnspents = false;

    if (!options.isNull()) {

        if (options.type() == UniValue::VBOOL) {

            // backward compatibility bool only fallback, does nothing

        } else {

            RPCTypeCheckObj(options,

                {

                    {"add_inputs", UniValueType(UniValue::VBOOL)},

                    {"include_unsafe", UniValueType(UniValue::VBOOL)},

                    {"add_to_wallet", UniValueType(UniValue::VBOOL)},

                    {"changeAddress", UniValueType(UniValue::VSTR)},

                    {"change_address", UniValueType(UniValue::VSTR)},

                    {"changePosition", UniValueType(UniValue::VNUM)},

                    {"change_position", UniValueType(UniValue::VNUM)},

                    {"change_type", UniValueType(UniValue::VSTR)},

                    {"includeWatching", UniValueType(UniValue::VBOOL)},

                    {"include_watching", UniValueType(UniValue::VBOOL)},

                    {"inputs", UniValueType(UniValue::VARR)},

                    {"lockUnspents", UniValueType(UniValue::VBOOL)},

                    {"lock_unspents", UniValueType(UniValue::VBOOL)},

                    {"locktime", UniValueType(UniValue::VNUM)},

                    {"fee_rate", UniValueType()}, // will be checked by AmountFromValue() in SetFeeEstimateMode()

                    {"feeRate", UniValueType()}, // will be checked by AmountFromValue() below

                    {"psbt", UniValueType(UniValue::VBOOL)},

                    {"solving_data", UniValueType(UniValue::VOBJ)},

                    {"subtractFeeFromOutputs", UniValueType(UniValue::VARR)},

                    {"subtract_fee_from_outputs", UniValueType(UniValue::VARR)},

                    {"replaceable", UniValueType(UniValue::VBOOL)},

                    {"conf_target", UniValueType(UniValue::VNUM)},

                    {"estimate_mode", UniValueType(UniValue::VSTR)},

                    {"minconf", UniValueType(UniValue::VNUM)},

                    {"maxconf", UniValueType(UniValue::VNUM)},

                    {"input_weights", UniValueType(UniValue::VARR)},

                    {"max_tx_weight", UniValueType(UniValue::VNUM)},

                },

                true, true);

            if (options.exists("add_inputs")) {

                coinControl.m_allow_other_inputs = options["add_inputs"].get_bool();

            }

            if (options.exists("changeAddress") || options.exists("change_address")) {

                const std::string change_address_str = (options.exists("change_address") ? options["change_address"] : options["changeAddress"]).get_str();

                CTxDestination dest = DecodeDestination(change_address_str);

                if (!IsValidDestination(dest)) {

                    throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Change address must be a valid bitcoin address");

                }

                coinControl.destChange = dest;

            }

            if (options.exists("changePosition") || options.exists("change_position")) {

                int pos = (options.exists("change_position") ? options["change_position"] : options["changePosition"]).getInt<int>();

                if (pos < 0 || (unsigned int)pos > recipients.size()) {

                    throw JSONRPCError(RPC_INVALID_PARAMETER, "changePosition out of bounds");

                }

                change_position = (unsigned int)pos;

            }

            if (options.exists("change_type")) {

                if (options.exists("changeAddress") || options.exists("change_address")) {

                    throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot specify both change address and address type options");

                }

                if (std::optional<OutputType> parsed = ParseOutputType(options["change_type"].get_str())) {

                    coinControl.m_change_type.emplace(parsed.value());

                } else {

                    throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("Unknown change type '%s'", options["change_type"].get_str()));

                }

            }

            if (options.exists("lockUnspents") || options.exists("lock_unspents")) {

                lockUnspents = (options.exists("lock_unspents") ? options["lock_unspents"] : options["lockUnspents"]).get_bool();

            }

            if (options.exists("include_unsafe")) {

                coinControl.m_include_unsafe_inputs = options["include_unsafe"].get_bool();

            }

            if (options.exists("feeRate")) {

                if (options.exists("fee_rate")) {

                    throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot specify both fee_rate (" + CURRENCY_ATOM + "/vB) and feeRate (" + CURRENCY_UNIT + "/kvB)");

                }

                if (options.exists("conf_target")) {

                    throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot specify both conf_target and feeRate. Please provide either a confirmation target in blocks for automatic fee estimation, or an explicit fee rate.");

                }

                if (options.exists("estimate_mode")) {

                    throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot specify both estimate_mode and feeRate");

                }

                coinControl.m_feerate = CFeeRate(AmountFromValue(options["feeRate"]));

                coinControl.fOverrideFeeRate = true;

            }

            if (options.exists("replaceable")) {

                coinControl.m_signal_bip125_rbf = options["replaceable"].get_bool();

            }

            if (options.exists("minconf")) {

                coinControl.m_min_depth = options["minconf"].getInt<int>();

                if (coinControl.m_min_depth < 0) {

                    throw JSONRPCError(RPC_INVALID_PARAMETER, "Negative minconf");

                }

            }

            if (options.exists("maxconf")) {

                coinControl.m_max_depth = options["maxconf"].getInt<int>();

                if (coinControl.m_max_depth < coinControl.m_min_depth) {

                    throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("maxconf can't be lower than minconf: %d < %d", coinControl.m_max_depth, coinControl.m_min_depth));

                }

            }

            SetFeeEstimateMode(wallet, coinControl, options["conf_target"], options["estimate_mode"], options["fee_rate"], override_min_fee);

        }

    }

    if (options.exists("solving_data")) {

        const UniValue solving_data = options["solving_data"].get_obj();

        if (solving_data.exists("pubkeys")) {

            for (const UniValue& pk_univ : solving_data["pubkeys"].get_array().getValues()) {

                const CPubKey pubkey = HexToPubKey(pk_univ.get_str());

                coinControl.m_external_provider.pubkeys.emplace(pubkey.GetID(), pubkey);

                // Add witness script for pubkeys

                const CScript wit_script = GetScriptForDestination(WitnessV0KeyHash(pubkey));

                coinControl.m_external_provider.scripts.emplace(CScriptID(wit_script), wit_script);

            }

        }

        if (solving_data.exists("scripts")) {

            for (const UniValue& script_univ : solving_data["scripts"].get_array().getValues()) {

                const std::string& script_str = script_univ.get_str();

                if (!IsHex(script_str)) {

                    throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("'%s' is not hex", script_str));

                }

                std::vector<unsigned char> script_data(ParseHex(script_str));

                const CScript script(script_data.begin(), script_data.end());

                coinControl.m_external_provider.scripts.emplace(CScriptID(script), script);

            }

        }

        if (solving_data.exists("descriptors")) {

            for (const UniValue& desc_univ : solving_data["descriptors"].get_array().getValues()) {

                const std::string& desc_str  = desc_univ.get_str();

                FlatSigningProvider desc_out;

                std::string error;

                std::vector<CScript> scripts_temp;

                auto descs = Parse(desc_str, desc_out, error, true);

                if (descs.empty()) {

                    throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Unable to parse descriptor '%s': %s", desc_str, error));

                }

                for (auto& desc : descs) {

                    desc->Expand(0, desc_out, scripts_temp, desc_out);

                }

                coinControl.m_external_provider.Merge(std::move(desc_out));

            }

        }

    }

    if (options.exists("input_weights")) {

        for (const UniValue& input : options["input_weights"].get_array().getValues()) {

            Txid txid = Txid::FromUint256(ParseHashO(input, "txid"));

            const UniValue& vout_v = input.find_value("vout");

            if (!vout_v.isNum()) {

                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, missing vout key");

            }

            int vout = vout_v.getInt<int>();

            if (vout < 0) {

                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, vout cannot be negative");

            }

            const UniValue& weight_v = input.find_value("weight");

            if (!weight_v.isNum()) {

                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, missing weight key");

            }

            int64_t weight = weight_v.getInt<int64_t>();

            const int64_t min_input_weight = GetTransactionInputWeight(CTxIn());

            CHECK_NONFATAL(min_input_weight == 165);

            if (weight < min_input_weight) {

                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, weight cannot be less than 165 (41 bytes (size of outpoint + sequence + empty scriptSig) * 4 (witness scaling factor)) + 1 (empty witness)");

            }

            if (weight > MAX_STANDARD_TX_WEIGHT) {

                throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Invalid parameter, weight cannot be greater than the maximum standard tx weight of %d", MAX_STANDARD_TX_WEIGHT));

            }

            coinControl.SetInputWeight(COutPoint(txid, vout), weight);

        }

    }

    if (options.exists("max_tx_weight")) {

        coinControl.m_max_tx_weight = options["max_tx_weight"].getInt<int>();

    }

    if (tx.version == TRUC_VERSION) {

        if (!coinControl.m_max_tx_weight.has_value() || coinControl.m_max_tx_weight.value() > TRUC_MAX_WEIGHT) {

            coinControl.m_max_tx_weight = TRUC_MAX_WEIGHT;

        }

    }

    if (recipients.empty())

        throw JSONRPCError(RPC_INVALID_PARAMETER, "TX must have at least one output");

    auto txr = FundTransaction(wallet, tx, recipients, change_position, lockUnspents, coinControl);

    if (!txr) {

        throw JSONRPCError(RPC_WALLET_ERROR, ErrorString(txr).original);

    }

    return *txr;

}

static void SetOptionsInputWeights(const UniValue& inputs, UniValue& options)

{

    if (options.exists("input_weights")) {

        throw JSONRPCError(RPC_INVALID_PARAMETER, "Input weights should be specified in inputs rather than in options.");

    }

    if (inputs.size() == 0) {

        return;

    }

    UniValue weights(UniValue::VARR);

    for (const UniValue& input : inputs.getValues()) {

        if (input.exists("weight")) {

            weights.push_back(input);

        }

    }

    options.pushKV("input_weights", std::move(weights));

}

RPCMethod fundrawtransaction()

{

    return RPCMethod{

        "fundrawtransaction",

        "If the transaction has no inputs, they will be automatically selected to meet its out value.\n"

                "It will add at most one change output to the outputs.\n"

                "No existing outputs will be modified unless \"subtractFeeFromOutputs\" is specified.\n"

                "Note that inputs which were signed may need to be resigned after completion since in/outputs have been added.\n"

                "The inputs added will not be signed, use signrawtransactionwithkey\n"

                "or signrawtransactionwithwallet for that.\n"

                "All existing inputs must either have their previous output transaction be in the wallet\n"

                "or be in the UTXO set. Solving data must be provided for non-wallet inputs.\n"

                "Note that all inputs selected must be of standard form and P2SH scripts must be\n"

                "in the wallet using importdescriptors (to calculate fees).\n"

                "You can see whether this is the case by checking the \"solvable\" field in the listunspent output.\n"

                "Note that if specifying an exact fee rate, the resulting transaction may have a higher fee rate\n"

                "if the transaction has unconfirmed inputs. This is because the wallet will attempt to make the\n"

                "entire package have the given fee rate, not the resulting transaction.\n",

                {

                    {"hexstring", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The hex string of the raw transaction"},

                    {"options", RPCArg::Type::OBJ_NAMED_PARAMS, RPCArg::Optional::OMITTED, "",

                        Cat<std::vector<RPCArg>>(

                        {

                            {"add_inputs", RPCArg::Type::BOOL, RPCArg::Default{true}, "For a transaction with existing inputs, automatically include more if they are not enough."},

                            {"include_unsafe", RPCArg::Type::BOOL, RPCArg::Default{false}, "Include inputs that are not safe to spend (unconfirmed transactions from outside keys and unconfirmed replacement transactions).\n"

                                                          "Warning: the resulting transaction may become invalid if one of the unsafe inputs disappears.\n"

                                                          "If that happens, you will need to fund the transaction with different inputs and republish it."},

                            {"minconf", RPCArg::Type::NUM, RPCArg::Default{0}, "If add_inputs is specified, require inputs with at least this many confirmations."},

                            {"maxconf", RPCArg::Type::NUM, RPCArg::Optional::OMITTED, "If add_inputs is specified, require inputs with at most this many confirmations."},

                            {"changeAddress", RPCArg::Type::STR, RPCArg::DefaultHint{"automatic"}, "The bitcoin address to receive the change"},

                            {"changePosition", RPCArg::Type::NUM, RPCArg::DefaultHint{"random"}, "The index of the change output"},

                            {"change_type", RPCArg::Type::STR, RPCArg::DefaultHint{"set by -changetype"}, "The output type to use. Only valid if changeAddress is not specified. Options are " + FormatAllOutputTypes() + "."},

                            {"includeWatching", RPCArg::Type::BOOL, RPCArg::Default{false}, "(DEPRECATED) No longer used"},

                            {"lockUnspents", RPCArg::Type::BOOL, RPCArg::Default{false}, "Lock selected unspent outputs"},

                            {"fee_rate", RPCArg::Type::AMOUNT, RPCArg::DefaultHint{"not set, fall back to wallet fee estimation"}, "Specify a fee rate in " + CURRENCY_ATOM + "/vB."},

                            {"feeRate", RPCArg::Type::AMOUNT, RPCArg::DefaultHint{"not set, fall back to wallet fee estimation"}, "Specify a fee rate in " + CURRENCY_UNIT + "/kvB."},

                            {"subtractFeeFromOutputs", RPCArg::Type::ARR, RPCArg::Default{UniValue::VARR}, "The integers.\n"

                                                          "The fee will be equally deducted from the amount of each specified output.\n"

                                                          "Those recipients will receive less bitcoins than you enter in their corresponding amount field.\n"

                                                          "If no outputs are specified here, the sender pays the fee.",

                                {

                                    {"vout_index", RPCArg::Type::NUM, RPCArg::Optional::OMITTED, "The zero-based output index, before a change output is added."},

                                },

                            },

                            {"input_weights", RPCArg::Type::ARR, RPCArg::Optional::OMITTED, "Inputs and their corresponding weights",

                                {

                                    {"", RPCArg::Type::OBJ, RPCArg::Optional::OMITTED, "",

                                        {

                                            {"txid", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The transaction id"},

                                            {"vout", RPCArg::Type::NUM, RPCArg::Optional::NO, "The output index"},

                                            {"weight", RPCArg::Type::NUM, RPCArg::Optional::NO, "The maximum weight for this input, "

                                                "including the weight of the outpoint and sequence number. "

                                                "Note that serialized signature sizes are not guaranteed to be consistent, "

                                                "so the maximum DER signatures size of 73 bytes should be used when considering ECDSA signatures."

                                                "Remember to convert serialized sizes to weight units when necessary."},

                                        },

                                    },

                                },

                             },

                            {"max_tx_weight", RPCArg::Type::NUM, RPCArg::Default{MAX_STANDARD_TX_WEIGHT}, "The maximum acceptable transaction weight.\n"

                                                          "Transaction building will fail if this can not be satisfied."},

                        },

                        FundTxDoc()),

                        RPCArgOptions{

                            .skip_type_check = true,

                            .oneline_description = "options",

                        }},

                    {"iswitness", RPCArg::Type::BOOL, RPCArg::DefaultHint{"depends on heuristic tests"}, "Whether the transaction hex is a serialized witness transaction.\n"

                        "If iswitness is not present, heuristic tests will be used in decoding.\n"

                        "If true, only witness deserialization will be tried.\n"

                        "If false, only non-witness deserialization will be tried.\n"

                        "This boolean should reflect whether the transaction has inputs\n"

                        "(e.g. fully valid, or on-chain transactions), if known by the caller."

                    },

                },

                RPCResult{

                    RPCResult::Type::OBJ, "", "",

                    {

                        {RPCResult::Type::STR_HEX, "hex", "The resulting raw transaction (hex-encoded string)"},

                        {RPCResult::Type::STR_AMOUNT, "fee", "Fee in " + CURRENCY_UNIT + " the resulting transaction pays"},

                        {RPCResult::Type::NUM, "changepos", "The position of the added change output, or -1"},

                    }

                                },

                                RPCExamples{

                            "\nCreate a transaction with no inputs\n"

                            + HelpExampleCli("createrawtransaction", "\"[]\" \"{\\\"myaddress\\\":0.01}\"") +

                            "\nAdd sufficient unsigned inputs to meet the output value\n"

                            + HelpExampleCli("fundrawtransaction", "\"rawtransactionhex\"") +

                            "\nSign the transaction\n"

                            + HelpExampleCli("signrawtransactionwithwallet", "\"fundedtransactionhex\"") +

                            "\nSend the transaction\n"

                            + HelpExampleCli("sendrawtransaction", "\"signedtransactionhex\"")

                                },

        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue

{

    std::shared_ptr<CWallet> const pwallet = GetWalletForJSONRPCRequest(request);

    if (!pwallet) return UniValue::VNULL;

    // parse hex string from parameter

    CMutableTransaction tx;

    bool try_witness = request.params[2].isNull() ? true : request.params[2].get_bool();

    bool try_no_witness = request.params[2].isNull() ? true : !request.params[2].get_bool();

    if (!DecodeHexTx(tx, request.params[0].get_str(), try_no_witness, try_witness)) {

        throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "TX decode failed");

    }

    UniValue options = request.params[1];

    std::vector<std::pair<CTxDestination, CAmount>> destinations;

    for (const auto& tx_out : tx.vout) {

        CTxDestination dest;

        ExtractDestination(tx_out.scriptPubKey, dest);

        destinations.emplace_back(dest, tx_out.nValue);

    }

    std::vector<std::string> dummy(destinations.size(), "dummy");

    std::vector<CRecipient> recipients = CreateRecipients(

            destinations,

            InterpretSubtractFeeFromOutputInstructions(options["subtractFeeFromOutputs"], dummy)

    );

    CCoinControl coin_control;

    // Automatically select (additional) coins. Can be overridden by options.add_inputs.

    coin_control.m_allow_other_inputs = true;

    // Clear tx.vout since it is not meant to be used now that we are passing outputs directly.

    // This sets us up for a future PR to completely remove tx from the function signature in favor of passing inputs directly

    tx.vout.clear();

    auto txr = FundTransaction(*pwallet, tx, recipients, options, coin_control, /*override_min_fee=*/true);

    UniValue result(UniValue::VOBJ);

    result.pushKV("hex", EncodeHexTx(*txr.tx));

    result.pushKV("fee", ValueFromAmount(txr.fee));

    result.pushKV("changepos", txr.change_pos ? (int)*txr.change_pos : -1);

    return result;

},

    };

}

RPCMethod signrawtransactionwithwallet()

{

    return RPCMethod{

        "signrawtransactionwithwallet",

        "Sign inputs for raw transaction (serialized, hex-encoded).\n"

                "The second optional argument (may be null) is an array of previous transaction outputs that\n"

                "this transaction depends on but may not yet be in the block chain." +

        HELP_REQUIRING_PASSPHRASE,

                {

                    {"hexstring", RPCArg::Type::STR, RPCArg::Optional::NO, "The transaction hex string"},

                    {"prevtxs", RPCArg::Type::ARR, RPCArg::Optional::OMITTED, "The previous dependent transaction outputs",

                        {

                            {"", RPCArg::Type::OBJ, RPCArg::Optional::OMITTED, "",

                                {

                                    {"txid", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The transaction id"},

                                    {"vout", RPCArg::Type::NUM, RPCArg::Optional::NO, "The output number"},

                                    {"scriptPubKey", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The output script"},

                                    {"redeemScript", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, "(required for P2SH) redeem script"},

                                    {"witnessScript", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, "(required for P2WSH or P2SH-P2WSH) witness script"},

                                    {"amount", RPCArg::Type::AMOUNT, RPCArg::Optional::OMITTED, "(required for Segwit inputs) the amount spent"},

                                },

                            },

                        },

                    },

                    {"sighashtype", RPCArg::Type::STR, RPCArg::Default{"DEFAULT for Taproot, ALL otherwise"}, "The signature hash type. Must be one of\n"

            "       \"DEFAULT\"\n"

            "       \"ALL\"\n"

            "       \"NONE\"\n"

            "       \"SINGLE\"\n"

            "       \"ALL|ANYONECANPAY\"\n"

            "       \"NONE|ANYONECANPAY\"\n"

            "       \"SINGLE|ANYONECANPAY\""},

                },

                RPCResult{

                    RPCResult::Type::OBJ, "", "",

                    {

                        {RPCResult::Type::STR_HEX, "hex", "The hex-encoded raw transaction with signature(s)"},

                        {RPCResult::Type::BOOL, "complete", "If the transaction has a complete set of signatures"},

                        {RPCResult::Type::ARR, "errors", /*optional=*/true, "Script verification errors (if there are any)",

                        {

                            {RPCResult::Type::OBJ, "", "",

                            {

                                {RPCResult::Type::STR_HEX, "txid", "The hash of the referenced, previous transaction"},

                                {RPCResult::Type::NUM, "vout", "The index of the output to spent and used as input"},

                                {RPCResult::Type::ARR, "witness", "",

                                {

                                    {RPCResult::Type::STR_HEX, "witness", ""},

                                }},

                                {RPCResult::Type::STR_HEX, "scriptSig", "The hex-encoded signature script"},

                                {RPCResult::Type::NUM, "sequence", "Script sequence number"},

                                {RPCResult::Type::STR, "error", "Verification or signing error related to the input"},

                            }},

                        }},

                    }

                },

                RPCExamples{

                    HelpExampleCli("signrawtransactionwithwallet", "\"myhex\"")

            + HelpExampleRpc("signrawtransactionwithwallet", "\"myhex\"")

                },

        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue

{

    const std::shared_ptr<const CWallet> pwallet = GetWalletForJSONRPCRequest(request);

    if (!pwallet) return UniValue::VNULL;

    CMutableTransaction mtx;

    if (!DecodeHexTx(mtx, request.params[0].get_str())) {

        throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "TX decode failed. Make sure the tx has at least one input.");

    }

    // Sign the transaction

    LOCK(pwallet->cs_wallet);

    EnsureWalletIsUnlocked(*pwallet);

    // Fetch previous transactions (inputs):

    std::map<COutPoint, Coin> coins;

    for (const CTxIn& txin : mtx.vin) {

        coins[txin.prevout]; // Create empty map entry keyed by prevout.

    }

    pwallet->chain().findCoins(coins);

    // Parse the prevtxs array

    ParsePrevouts(request.params[1], nullptr, coins);

    std::optional<int> nHashType = ParseSighashString(request.params[2]);

    if (!nHashType) {

        nHashType = SIGHASH_DEFAULT;

    }

    // Script verification errors

    std::map<int, bilingual_str> input_errors;

    bool complete = pwallet->SignTransaction(mtx, coins, *nHashType, input_errors);

    UniValue result(UniValue::VOBJ);

    SignTransactionResultToJSON(mtx, complete, coins, input_errors, result);

    return result;

},

    };

}

// Definition of allowed formats of specifying transaction outputs in

// `bumpfee`, `psbtbumpfee`, `send` and `walletcreatefundedpsbt` RPCs.

static std::vector<RPCArg> OutputsDoc()

{

    return

    {

        {"", RPCArg::Type::OBJ_USER_KEYS, RPCArg::Optional::OMITTED, "",

            {

                {"address", RPCArg::Type::AMOUNT, RPCArg::Optional::NO, "A key-value pair. The key (string) is the bitcoin address,\n"

                         "the value (float or string) is the amount in " + CURRENCY_UNIT + ""},

            },

        },

        {"", RPCArg::Type::OBJ, RPCArg::Optional::OMITTED, "",

            {

                {"data", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "A key-value pair. The key must be \"data\", the value is hex-encoded data that becomes a part of an OP_RETURN output"},

            },

        },

    };

}

static RPCMethod bumpfee_helper(std::string method_name)

{

    const bool want_psbt = method_name == "psbtbumpfee";

    const std::string incremental_fee{CFeeRate(DEFAULT_INCREMENTAL_RELAY_FEE).ToString(FeeRateFormat::SAT_VB)};

    return RPCMethod{method_name,

        "Bumps the fee of a transaction T, replacing it with a new transaction B.\n"

        + std::string(want_psbt ? "Returns a PSBT instead of creating and signing a new transaction.\n" : "") +

        "A transaction with the given txid must be in the wallet.\n"

        "The command will pay the additional fee by reducing change outputs or adding inputs when necessary.\n"

        "It may add a new change output if one does not already exist.\n"

        "All inputs in the original transaction will be included in the replacement transaction.\n"

        "The command will fail if the wallet or mempool contains a transaction that spends one of T's outputs.\n"

        "By default, the new fee will be calculated automatically using the estimatesmartfee RPC.\n"

        "The user can specify a confirmation target for estimatesmartfee.\n"

        "Alternatively, the user can specify a fee rate in " + CURRENCY_ATOM + "/vB for the new transaction.\n"

        "At a minimum, the new fee rate must be high enough to pay an additional new relay fee (incrementalfee\n"

        "returned by getnetworkinfo) to enter the node's mempool.\n"

        "* WARNING: before version 0.21, fee_rate was in " + CURRENCY_UNIT + "/kvB. As of 0.21, fee_rate is in " + CURRENCY_ATOM + "/vB. *\n",

        {

            {"txid", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The txid to be bumped"},

            {"options", RPCArg::Type::OBJ_NAMED_PARAMS, RPCArg::Optional::OMITTED, "",

                Cat(

                {

                    {"conf_target", RPCArg::Type::NUM, RPCArg::DefaultHint{"wallet -txconfirmtarget"}, "Confirmation target in blocks\n"},

                    {"fee_rate", RPCArg::Type::AMOUNT, RPCArg::DefaultHint{"not set, fall back to wallet fee estimation"},

                             "\nSpecify a fee rate in " + CURRENCY_ATOM + "/vB instead of relying on the built-in fee estimator.\n"

                             "Must be at least " + incremental_fee + " higher than the current transaction fee rate.\n"

                             "WARNING: before version 0.21, fee_rate was in " + CURRENCY_UNIT + "/kvB. As of 0.21, fee_rate is in " + CURRENCY_ATOM + "/vB.\n"},

                    {"replaceable", RPCArg::Type::BOOL, RPCArg::Default{true},

                             "Whether the new transaction should be\n"

                             "marked bip-125 replaceable. If true, the sequence numbers in the transaction will\n"

                             "be set to 0xfffffffd. If false, any input sequence numbers in the\n"

                             "transaction will be set to 0xfffffffe\n"

                             "so the new transaction will not be explicitly bip-125 replaceable (though it may\n"

                             "still be replaceable in practice, for example if it has unconfirmed ancestors which\n"

                             "are replaceable).\n"},

                    {"estimate_mode", RPCArg::Type::STR, RPCArg::Default{"unset"}, "The fee estimate mode, must be one of (case insensitive):\n"

                              + FeeModesDetail(std::string("economical mode is used if the transaction is replaceable;\notherwise, conservative mode is used"))},

                    {"outputs", RPCArg::Type::ARR, RPCArg::Default{UniValue::VARR}, "The outputs specified as key-value pairs.\n"

                             "Each key may only appear once, i.e. there can only be one 'data' output, and no address may be duplicated.\n"

                             "At least one output of either type must be specified.\n"

                             "Cannot be provided if 'original_change_index' is specified.",

                        OutputsDoc(),

                        RPCArgOptions{.skip_type_check = true}},

                    {"original_change_index", RPCArg::Type::NUM, RPCArg::DefaultHint{"not set, detect change automatically"}, "The 0-based index of the change output on the original transaction. "

                                                                                                                            "The indicated output will be recycled into the new change output on the bumped transaction. "

                                                                                                                            "The remainder after paying the recipients and fees will be sent to the output script of the "

                                                                                                                            "original change output. The change output’s amount can increase if bumping the transaction "

                                                                                                                            "adds new inputs, otherwise it will decrease. Cannot be used in combination with the 'outputs' option."},

                },

                want_psbt ? std::vector<RPCArg>{{"psbt_version", RPCArg::Type::NUM, RPCArg::Default(2), "The PSBT version number to use."}} : std::vector<RPCArg>()

                ),

                RPCArgOptions{.oneline_description="options"}},

        },

        RPCResult{