AMM.cpp

#include <test/jtx/AMM.h>
 
#include <test/jtx/Account.h>
#include <test/jtx/Env.h>
#include <test/jtx/multisign.h>
#include <test/jtx/seq.h>
#include <test/jtx/ter.h>
 
#include <xrpl/basics/Number.h>
#include <xrpl/basics/contract.h>
#include <xrpl/basics/safe_cast.h>
#include <xrpl/json/json_value.h>
#include <xrpl/json/to_string.h>
#include <xrpl/ledger/helpers/AMMHelpers.h>
#include <xrpl/ledger/helpers/TokenHelpers.h>
#include <xrpl/protocol/AMMCore.h>
#include <xrpl/protocol/AccountID.h>
#include <xrpl/protocol/AmountConversions.h>
#include <xrpl/protocol/ApiVersion.h>
#include <xrpl/protocol/Asset.h>
#include <xrpl/protocol/Feature.h>
#include <xrpl/protocol/IOUAmount.h>
#include <xrpl/protocol/Indexes.h>
#include <xrpl/protocol/SField.h>
#include <xrpl/protocol/STAmount.h>
#include <xrpl/protocol/STArray.h>
#include <xrpl/protocol/TER.h>
#include <xrpl/protocol/TxFlags.h>
#include <xrpl/protocol/jss.h>
 
#include <algorithm>
#include <cstdint>
#include <iostream>
#include <optional>
#include <stdexcept>
#include <string>
#include <tuple>
#include <utility>
#include <vector>
 
namespace xrpl::test::jtx {
 
static Number
number(STAmount const& a)
{
    if (isXRP(a))
        return a.xrp();
    return a;
}
 
IOUAmount
AMM::initialTokens()
{
    if (!env_.enabled(fixAMMv1_3))
    {
        auto const product = number(asset1_) * number(asset2_);
        return (IOUAmount)(product.mantissa() >= 0 ? root2(product) : root2(-product));
    }
    return getLPTokensBalance();
}
 
AMM::AMM(
    Env& env,
    Account account,
    STAmount asset1,
    STAmount asset2,
    bool log,
    std::uint16_t tfee,
    std::uint32_t fee,
    std::optional<std::uint32_t> flags,
    std::optional<jtx::Seq> seq,
    std::optional<jtx::Msig> ms,
    std::optional<Ter> const& ter,
    bool close)
    : env_(env)
    , creatorAccount_(std::move(account))
    , asset1_(std::move(asset1))
    , asset2_(std::move(asset2))
    , ammID_(keylet::amm(asset1_.asset(), asset2_.asset()).key)
    , log_(log)
    , doClose_(close)
    , lastPurchasePrice_(0)
    , msig_(std::move(ms))
    , fee_(fee)
    , ammAccount_(create(tfee, flags, seq, ter))
    , lptIssue_(xrpl::ammLPTIssue(asset1_.asset(), asset2_.asset(), ammAccount_))
    , initialLPTokens_(initialTokens())
{
}
 
AMM::AMM(
    Env& env,
    Account const& account,
    STAmount const& asset1,
    STAmount const& asset2,
    Ter const& ter,
    bool log,
    bool close)
    : AMM(env,
          account,
          asset1,
          asset2,
          log,
          0,
          0,
          std::nullopt,
          std::nullopt,
          std::nullopt,
          ter,
          close)
{
}
 
AMM::AMM(
    Env& env,
    Account const& account,
    STAmount const& asset1,
    STAmount const& asset2,
    CreateArg const& arg)
    : AMM(env,
          account,
          asset1,
          asset2,
          arg.log,
          arg.tfee,
          arg.fee,
          arg.flags,
          arg.seq,
          arg.ms,
          arg.err,
          arg.close)
{
}
 
json::Value
AMM::createJv(
    AccountID const& account,
    STAmount const& asset1,
    STAmount const& asset2,
    std::uint16_t const& tfee)
{
    json::Value jv;
    jv[jss::Account] = to_string(account);
    jv[jss::Amount] = asset1.getJson(JsonOptions::Values::None);
    jv[jss::Amount2] = asset2.getJson(JsonOptions::Values::None);
    jv[jss::TradingFee] = tfee;
    jv[jss::TransactionType] = jss::AMMCreate;
 
    return jv;
}
 
[[nodiscard]] AccountID
AMM::create(
    std::uint32_t tfee,
    std::optional<std::uint32_t> const& flags,
    std::optional<jtx::Seq> const& seq,
    std::optional<Ter> const& ter)
{
    json::Value jv = createJv(creatorAccount_, asset1_, asset2_, tfee);
    if (flags)
        jv[jss::Flags] = *flags;
    if (fee_ != 0)
    {
        jv[sfFee] = std::to_string(fee_);
    }
    else
    {
        jv[jss::Fee] = std::to_string(env_.current()->fees().increment.drops());
    }
    submit(jv, seq, ter);
 
    if (!ter || env_.ter() == tesSUCCESS)
    {
        if (auto const amm = env_.current()->read(keylet::amm(asset1_.asset(), asset2_.asset())))
        {
            return amm->getAccountID(sfAccount);
        }
    }
    return {};
}
 
json::Value
AMM::ammRpcInfo(
    std::optional<AccountID> const& account,
    std::optional<std::string> const& ledgerIndex,
    std::optional<Asset> const& asset1,
    std::optional<Asset> const& asset2,
    std::optional<AccountID> const& ammAccount,
    bool ignoreParams,
    unsigned apiVersion) const
{
    auto const toJson = [](AccountID const& a) { return json::Value{to_string(a)}; };
 
    return ammRpcInfo(
        account.transform(toJson),
        ledgerIndex,
        asset1,
        asset2,
        ammAccount.transform(toJson),
        ignoreParams,
        apiVersion);
}
 
json::Value
AMM::ammRpcInfo(
    std::optional<json::Value> const& account,
    std::optional<std::string> const& ledgerIndex,
    std::optional<Asset> const& asset1,
    std::optional<Asset> const& asset2,
    std::optional<json::Value> const& ammAccount,
    bool ignoreParams,
    unsigned apiVersion) const
{
    json::Value jv;
    if (account)
        jv[jss::account] = *account;
    if (ledgerIndex)
        jv[jss::ledger_index] = *ledgerIndex;
    if (!ignoreParams)
    {
        if (asset1 || asset2)
        {
            if (asset1)
                jv[jss::asset] = STIssue(sfAsset, *asset1).getJson(JsonOptions::Values::None);
            if (asset2)
                jv[jss::asset2] = STIssue(sfAsset2, *asset2).getJson(JsonOptions::Values::None);
        }
        else if (!ammAccount)
        {
            jv[jss::asset] = STIssue(sfAsset, asset1_.asset()).getJson(JsonOptions::Values::None);
            jv[jss::asset2] = STIssue(sfAsset2, asset2_.asset()).getJson(JsonOptions::Values::None);
        }
        if (ammAccount)
            jv[jss::amm_account] = *ammAccount;
    }
    auto jr =
        (apiVersion == RPC::kApiInvalidVersion
             ? env_.rpc("json", "amm_info", to_string(jv))
             : env_.rpc(apiVersion, "json", "amm_info", to_string(jv)));
    if (jr.isObject() && jr.isMember(jss::result) && jr[jss::result].isMember(jss::status))
        return jr[jss::result];
    return json::ValueType::Null;
}
 
std::tuple<STAmount, STAmount, STAmount>
AMM::balances(Asset const& asset1, Asset const& asset2, std::optional<AccountID> const& account)
    const
{
    if (auto const amm = env_.current()->read(keylet::amm(asset1_.asset(), asset2_.asset())))
    {
        auto const ammAccountID = amm->getAccountID(sfAccount);
        auto const [asset1Balance, asset2Balance] = ammPoolHolds(
            *env_.current(),
            ammAccountID,
            asset1,
            asset2,
            FreezeHandling::IgnoreFreeze,
            AuthHandling::IgnoreAuth,
            env_.journal);
        auto const lptAMMBalance = account
            ? ammLPHolds(*env_.current(), *amm, *account, env_.journal)
            : amm->getFieldAmount(sfLPTokenBalance);
        return {asset1Balance, asset2Balance, lptAMMBalance};
    }
    return {STAmount{}, STAmount{}, STAmount{}};
}
 
bool
AMM::expectBalances(
    STAmount const& asset1,
    STAmount const& asset2,
    IOUAmount const& lpt,
    std::optional<AccountID> const& account) const
{
    auto const [asset1Balance, asset2Balance, lptAMMBalance] =
        balances(asset1.asset(), asset2.asset(), account);
    return asset1 == asset1Balance && asset2 == asset2Balance &&
        lptAMMBalance == STAmount{lpt, lptIssue_};
}
 
IOUAmount
AMM::getLPTokensBalance(std::optional<AccountID> const& account) const
{
    if (account)
    {
        return accountHolds(
                   *env_.current(), *account, lptIssue_, FreezeHandling::ZeroIfFrozen, env_.journal)
            .iou();
    }
    if (auto const amm = env_.current()->read(keylet::amm(asset1_.asset(), asset2_.asset())))
        return amm->getFieldAmount(sfLPTokenBalance).iou();
    return IOUAmount{0};
}
 
bool
AMM::expectLPTokens(AccountID const& account, IOUAmount const& expTokens) const
{
    if (auto const amm = env_.current()->read(keylet::amm(asset1_.asset(), asset2_.asset())))
    {
        auto const lptAMMBalance = ammLPHolds(*env_.current(), *amm, account, env_.journal);
        return lptAMMBalance == STAmount{expTokens, lptIssue_};
    }
    return false;
}
 
bool
AMM::expectAuctionSlot(
    std::uint32_t fee,
    std::optional<std::uint8_t> timeSlot,
    IOUAmount expectedPrice) const
{
    return expectAuctionSlot([&](std::uint32_t slotFee,
                                 std::optional<std::uint8_t> slotInterval,
                                 IOUAmount const& slotPrice,
                                 auto const&) {
        return slotFee == fee &&
            // Auction slot might be expired, in which case slotInterval is
            // 0
            ((!timeSlot && slotInterval == 0) || slotInterval == timeSlot) &&
            slotPrice == expectedPrice;
    });
}
 
bool
AMM::expectAuctionSlot(std::vector<AccountID> const& authAccounts) const
{
    return expectAuctionSlot(
        [&](std::uint32_t, std::optional<std::uint8_t>, IOUAmount const&, STArray const& accounts) {
            for (auto const& account : accounts)
            {
                if (std::ranges::find(authAccounts, account.getAccountID(sfAccount)) ==
                    authAccounts.end())
                    return false;
            }
            return true;
        });
}
 
bool
AMM::expectTradingFee(std::uint16_t fee) const
{
    auto const amm = env_.current()->read(keylet::amm(asset1_.asset(), asset2_.asset()));
    return amm && (*amm)[sfTradingFee] == fee;
}
 
bool
AMM::ammExists() const
{
    return env_.current()->read(keylet::account(ammAccount_)) != nullptr &&
        env_.current()->read(keylet::amm(asset1_.asset(), asset2_.asset())) != nullptr;
}
 
bool
AMM::expectAmmRpcInfo(
    STAmount const& asset1,
    STAmount const& asset2,
    IOUAmount const& balance,
    std::optional<AccountID> const& account,
    std::optional<std::string> const& ledgerIndex,
    std::optional<AccountID> const& ammAccount) const
{
    auto const jv = ammRpcInfo(account, ledgerIndex, std::nullopt, std::nullopt, ammAccount);
    return expectAmmInfo(asset1, asset2, balance, jv);
}
 
bool
AMM::expectAmmInfo(
    STAmount const& asset1,
    STAmount const& asset2,
    IOUAmount const& balance,
    json::Value const& jvRes) const
{
    if (!jvRes.isMember(jss::amm))
        return false;
    auto const& jv = jvRes[jss::amm];
    if (!jv.isMember(jss::amount) || !jv.isMember(jss::amount2) || !jv.isMember(jss::lp_token))
        return false;
    STAmount asset1Info;
    if (!amountFromJsonNoThrow(asset1Info, jv[jss::amount]))
        return false;
    STAmount asset2Info;
    if (!amountFromJsonNoThrow(asset2Info, jv[jss::amount2]))
        return false;
    STAmount lptBalance;
    if (!amountFromJsonNoThrow(lptBalance, jv[jss::lp_token]))
        return false;
    // ammRpcInfo returns unordered assets
    if (asset1Info.asset() != asset1.asset())
        std::swap(asset1Info, asset2Info);
    return asset1 == asset1Info && asset2 == asset2Info &&
        lptBalance == STAmount{balance, lptIssue_};
}
 
void
AMM::setTokens(json::Value& jv, std::optional<std::pair<Asset, Asset>> const& assets)
{
    if (assets)
    {
        jv[jss::Asset] = STIssue(sfAsset, assets->first).getJson(JsonOptions::Values::None);
        jv[jss::Asset2] = STIssue(sfAsset, assets->second).getJson(JsonOptions::Values::None);
    }
    else
    {
        jv[jss::Asset] = STIssue(sfAsset, asset1_.asset()).getJson(JsonOptions::Values::None);
        jv[jss::Asset2] = STIssue(sfAsset, asset2_.asset()).getJson(JsonOptions::Values::None);
    }
}
 
json::Value
AMM::depositJv(DepositArg const& arg)
{
    json::Value jv;
    if (!arg.account || !arg.assets)
        Throw<std::runtime_error>("AMM::depositJv: account or assets not set");
 
    jv[jss::Account] = arg.account->human();
    jv[jss::Asset] = STIssue(sfAsset, arg.assets->first).getJson(JsonOptions::Values::None);
    jv[jss::Asset2] = STIssue(sfAsset, arg.assets->second).getJson(JsonOptions::Values::None);
    if (arg.tokens)
        arg.tokens->tokens().setJson(jv[jss::LPTokenOut]);
    if (arg.asset1In)
        arg.asset1In->setJson(jv[jss::Amount]);
    if (arg.asset2In)
        arg.asset2In->setJson(jv[jss::Amount2]);
    if (arg.maxEP)
        arg.maxEP->setJson(jv[jss::EPrice]);
    if (arg.tfee)
        jv[jss::TradingFee] = *arg.tfee;
    std::uint32_t flags = 0;
    if (arg.flags)
        flags = *arg.flags;
    // If including asset1In and asset2In or tokens as
    // deposit min amounts then must set the flags
    // explicitly instead of relying on this logic.
    if ((flags & tfDepositSubTx) == 0u)
    {
        if (arg.tokens && !arg.asset1In)
        {
            flags |= tfLPToken;
        }
        else if (arg.tokens && arg.asset1In)
        {
            flags |= tfOneAssetLPToken;
        }
        else if (arg.asset1In && arg.asset2In)
        {
            flags |= tfTwoAsset;
        }
        else if (arg.maxEP && arg.asset1In)
        {
            flags |= tfLimitLPToken;
        }
        else if (arg.asset1In)
        {
            flags |= tfSingleAsset;
        }
    }
    jv[jss::Flags] = flags;
 
    jv[jss::TransactionType] = jss::AMMDeposit;
 
    return jv;
}
 
IOUAmount
AMM::deposit(
    std::optional<Account> const& account,
    LPToken tokens,
    std::optional<STAmount> const& asset1In,
    std::optional<std::uint32_t> const& flags,
    std::optional<Ter> const& ter)
{
    return deposit(
        account,
        tokens,
        asset1In,
        std::nullopt,
        std::nullopt,
        flags,
        std::nullopt,
        std::nullopt,
        std::nullopt,
        ter);
}
 
IOUAmount
AMM::deposit(
    std::optional<Account> const& account,
    STAmount const& asset1In,
    std::optional<STAmount> const& asset2In,
    std::optional<STAmount> const& maxEP,
    std::optional<std::uint32_t> const& flags,
    std::optional<Ter> const& ter)
{
    if (asset2In && maxEP)
        Throw<std::runtime_error>("Invalid options: asset2In and maxEP");
    return deposit(
        account,
        std::nullopt,
        asset1In,
        asset2In,
        maxEP,
        flags,
        std::nullopt,
        std::nullopt,
        std::nullopt,
        ter);
}
 
IOUAmount
AMM::deposit(
    std::optional<Account> const& account,
    std::optional<LPToken> tokens,
    std::optional<STAmount> const& asset1In,
    std::optional<STAmount> const& asset2In,
    std::optional<STAmount> const& maxEP,
    std::optional<std::uint32_t> const& flags,
    std::optional<std::pair<Asset, Asset>> const& assets,
    std::optional<jtx::Seq> const& seq,
    std::optional<std::uint16_t> const& tfee,
    std::optional<Ter> const& ter)
{
    auto const acct = account ? account : creatorAccount_;
    auto const lpTokens = getLPTokensBalance(acct);
    json::Value jv = depositJv(
        {.account = acct,
         .tokens = tokens ? tokens->tokens(lptIssue_) : tokens,
         .asset1In = asset1In,
         .asset2In = asset2In,
         .maxEP = maxEP,
         .flags = flags,
         .assets = assets ? assets : std::make_pair(asset1_.asset(), asset2_.asset()),
         .tfee = tfee});
    if (fee_ != 0)
        jv[jss::Fee] = std::to_string(fee_);
    submit(jv, seq, ter);
    return getLPTokensBalance(acct) - lpTokens;
}
 
IOUAmount
AMM::deposit(DepositArg const& arg)
{
    return deposit(
        arg.account,
        arg.tokens,
        arg.asset1In,
        arg.asset2In,
        arg.maxEP,
        arg.flags,
        arg.assets,
        arg.seq,
        arg.tfee,
        arg.err);
}
 
json::Value
AMM::withdrawJv(WithdrawArg const& arg)
{
    json::Value jv;
    if (!arg.account || !arg.assets)
        Throw<std::runtime_error>("AMM::withdrawJv: account or assets not set");
    jv[jss::Account] = arg.account->human();
    jv[jss::Asset] = STIssue(sfAsset, arg.assets->first).getJson(JsonOptions::Values::None);
    jv[jss::Asset2] = STIssue(sfAsset, arg.assets->second).getJson(JsonOptions::Values::None);
    if (arg.tokens)
        arg.tokens->tokens().setJson(jv[jss::LPTokenIn]);
    if (arg.asset1Out)
        arg.asset1Out->setJson(jv[jss::Amount]);
    if (arg.asset2Out)
        arg.asset2Out->setJson(jv[jss::Amount2]);
    if (arg.maxEP)
        arg.maxEP->tokens().setJson(jv[jss::EPrice]);
    std::uint32_t flags = 0;
    if (arg.flags)
        flags = *arg.flags;
    if ((flags & tfWithdrawSubTx) == 0u)
    {
        if (arg.tokens && !arg.asset1Out)
        {
            flags |= tfLPToken;
        }
        else if (arg.asset1Out && arg.asset2Out)
        {
            flags |= tfTwoAsset;
        }
        else if (arg.tokens && arg.asset1Out)
        {
            flags |= tfOneAssetLPToken;
        }
        else if (arg.asset1Out && arg.maxEP)
        {
            flags |= tfLimitLPToken;
        }
        else if (arg.asset1Out)
        {
            flags |= tfSingleAsset;
        }
    }
    jv[jss::Flags] = flags;
 
    jv[jss::TransactionType] = jss::AMMWithdraw;
 
    return jv;
}
 
IOUAmount
AMM::withdraw(
    std::optional<Account> const& account,
    std::optional<LPToken> const& tokens,
    std::optional<STAmount> const& asset1Out,
    std::optional<std::uint32_t> const& flags,
    std::optional<Ter> const& ter)
{
    return withdraw(
        account,
        tokens,
        asset1Out,
        std::nullopt,
        std::nullopt,
        flags,
        std::nullopt,
        std::nullopt,
        ter);
}
 
IOUAmount
AMM::withdraw(
    std::optional<Account> const& account,
    STAmount const& asset1Out,
    std::optional<STAmount> const& asset2Out,
    std::optional<LPToken> const& maxEP,
    std::optional<Ter> const& ter)
{
    if (asset2Out && maxEP)
        Throw<std::runtime_error>("Invalid options: asset2Out and maxEP");
    return withdraw(
        account,
        std::nullopt,
        asset1Out,
        asset2Out,
        maxEP,
        std::nullopt,
        std::nullopt,
        std::nullopt,
        ter);
}
 
IOUAmount
AMM::withdraw(
    std::optional<Account> const& account,
    std::optional<LPToken> const& tokens,
    std::optional<STAmount> const& asset1Out,
    std::optional<STAmount> const& asset2Out,
    std::optional<LPToken> const& maxEP,
    std::optional<std::uint32_t> const& flags,
    std::optional<std::pair<Asset, Asset>> const& assets,
    std::optional<jtx::Seq> const& seq,
    std::optional<Ter> const& ter)
{
    auto const acct = account ? account : creatorAccount_;
    auto const lpTokens = getLPTokensBalance(acct);
    json::Value jv = withdrawJv({
        .account = acct,
        .tokens = tokens ? tokens->tokens(lptIssue_) : tokens,
        .asset1Out = asset1Out,
        .asset2Out = asset2Out,
        .maxEP = maxEP ? maxEP->tokens(lptIssue_) : maxEP,
        .flags = flags,
        .assets = assets ? assets : std::make_pair(asset1_.asset(), asset2_.asset()),
    });
    if (fee_ != 0)
        jv[jss::Fee] = std::to_string(fee_);
    submit(jv, seq, ter);
    return lpTokens - getLPTokensBalance(acct);
}
 
IOUAmount
AMM::withdraw(WithdrawArg const& arg)
{
    return withdraw(
        arg.account,
        arg.tokens,
        arg.asset1Out,
        arg.asset2Out,
        arg.maxEP,
        arg.flags,
        arg.assets,
        arg.seq,
        arg.err);
}
 
json::Value
AMM::voteJv(VoteArg const& arg)
{
    json::Value jv;
    if (!arg.account || !arg.assets)
        Throw<std::runtime_error>("AMM::withdrawJv: account or assets not set");
    jv[jss::Account] = arg.account->human();
    jv[jss::Asset] = STIssue(sfAsset, arg.assets->first).getJson(JsonOptions::Values::None);
    jv[jss::Asset2] = STIssue(sfAsset, arg.assets->second).getJson(JsonOptions::Values::None);
    jv[jss::TradingFee] = arg.tfee;
    if (arg.flags)
        jv[jss::Flags] = *arg.flags;
 
    jv[jss::TransactionType] = jss::AMMVote;
 
    return jv;
}
 
void
AMM::vote(
    std::optional<Account> const& account,
    std::uint32_t feeVal,
    std::optional<std::uint32_t> const& flags,
    std::optional<jtx::Seq> const& seq,
    std::optional<std::pair<Asset, Asset>> const& assets,
    std::optional<Ter> const& ter)
{
    json::Value jv = voteJv({
        .account = account ? account : creatorAccount_,
        .tfee = feeVal,
        .flags = flags,
        .assets = assets ? assets : std::make_pair(asset1_.asset(), asset2_.asset()),
    });
    if (fee_ != 0)
        jv[jss::Fee] = std::to_string(fee_);
    submit(jv, seq, ter);
}
 
void
AMM::vote(VoteArg const& arg)
{
    vote(arg.account, arg.tfee, arg.flags, arg.seq, arg.assets, arg.err);
}
 
json::Value
AMM::bid(BidArg const& arg)
{
    if (auto const amm = env_.current()->read(keylet::amm(asset1_.asset(), asset2_.asset())))
    {
        if (env_.current()->rules().enabled(fixInnerObjTemplate) &&
            !amm->isFieldPresent(sfAuctionSlot))
            Throw<std::runtime_error>("AMM::Bid");
        if (amm->isFieldPresent(sfAuctionSlot))
        {
            auto const& auctionSlot =
                safeDowncast<STObject const&>(amm->peekAtField(sfAuctionSlot));
            lastPurchasePrice_ = auctionSlot[sfPrice].iou();
        }
    }
    bidMin_ = std::nullopt;
    bidMax_ = std::nullopt;
 
    json::Value jv;
    jv[jss::Account] = arg.account ? arg.account->human() : creatorAccount_.human();
    setTokens(jv, arg.assets);
    auto getBid = [&](auto const& bid) {
        if (std::holds_alternative<int>(bid))
        {
            return STAmount{lptIssue_, std::get<int>(bid)};
        }
        if (std::holds_alternative<IOUAmount>(bid))
        {
            return toSTAmount(std::get<IOUAmount>(bid), lptIssue_);
        }
 
        return std::get<STAmount>(bid);
    };
    if (arg.bidMin)
    {
        STAmount const saTokens = getBid(*arg.bidMin);
        saTokens.setJson(jv[jss::BidMin]);
        bidMin_ = saTokens.iou();
    }
    if (arg.bidMax)
    {
        STAmount const saTokens = getBid(*arg.bidMax);
        saTokens.setJson(jv[jss::BidMax]);
        bidMax_ = saTokens.iou();
    }
    if (!arg.authAccounts.empty())
    {
        json::Value accounts(json::ValueType::Array);
        for (auto const& account : arg.authAccounts)
        {
            json::Value acct;
            json::Value authAcct;
            acct[jss::Account] = account.human();
            authAcct[jss::AuthAccount] = acct;
            accounts.append(authAcct);
        }
        jv[jss::AuthAccounts] = accounts;
    }
    if (arg.flags)
        jv[jss::Flags] = *arg.flags;
    jv[jss::TransactionType] = jss::AMMBid;
    if (fee_ != 0)
        jv[jss::Fee] = std::to_string(fee_);
    return jv;
}
 
void
AMM::clawback(ClawbackArg const& arg)
{
    auto const& [asset, asset2] = [&]() {
        if (arg.assets)
            return *arg.assets;
        return std::make_pair(asset1_.asset(), asset2_.asset());
    }();
    auto jv = amm::ammClawback(arg.issuer, arg.holder, asset, asset2, arg.amount);
    if (arg.flags)
        jv[jss::Flags] = *arg.flags;
    if (fee_ != 0)
        jv[jss::Fee] = std::to_string(fee_);
    submit(jv, std::nullopt, arg.err);
}
 
void
AMM::submit(
    json::Value const& jv,
    std::optional<jtx::Seq> const& seq,
    std::optional<Ter> const& ter)
{
    if (log_)
        std::cout << jv.toStyledString();
    if (msig_)
    {
        if (seq && ter)
        {
            env_(jv, *msig_, *seq, *ter);
        }
        else if (seq)
        {
            env_(jv, *msig_, *seq);
        }
        else if (ter)
        {
            env_(jv, *msig_, *ter);
        }
        else
        {
            env_(jv, *msig_);
        }
    }
    else if (seq && ter)
    {
        env_(jv, *seq, *ter);
    }
    else if (seq)
    {
        env_(jv, *seq);
    }
    else if (ter)
    {
        env_(jv, *ter);
    }
    else
    {
        env_(jv);
    }
    if (doClose_)
        env_.close();
}
 
bool
AMM::expectAuctionSlot(auto&& cb) const
{
    if (auto const amm = env_.current()->read(keylet::amm(asset1_.asset(), asset2_.asset())))
    {
        if (env_.current()->rules().enabled(fixInnerObjTemplate) &&
            !amm->isFieldPresent(sfAuctionSlot))
            Throw<std::runtime_error>("AMM::expectAuctionSlot");
        if (amm->isFieldPresent(sfAuctionSlot))
        {
            auto const& auctionSlot =
                safeDowncast<STObject const&>(amm->peekAtField(sfAuctionSlot));
            if (auctionSlot.isFieldPresent(sfAccount))
            {
                // This could fail in pre-fixInnerObjTemplate tests
                // if the submitted transactions recreate one of
                // the failure scenarios. Access as optional
                // to avoid the failure.
                auto const slotFee = auctionSlot[~sfDiscountedFee].value_or(0);
                auto const slotInterval = ammAuctionTimeSlot(
                    env_.app().getTimeKeeper().now().time_since_epoch().count(), auctionSlot);
                auto const slotPrice = auctionSlot[sfPrice].iou();
                auto const authAccounts = auctionSlot.getFieldArray(sfAuthAccounts);
                return cb(slotFee, slotInterval, slotPrice, authAccounts);
            }
        }
    }
    return false;
}
 
json::Value
AMM::deleteJv(AccountID const& account, Asset const& asset1, Asset const& asset2)
{
    json::Value jv;
    jv[jss::Account] = to_string(account);
    jv[jss::Asset] = STIssue(sfAsset, asset1).getJson(JsonOptions::Values::None);
    jv[jss::Asset2] = STIssue(sfAsset, asset2).getJson(JsonOptions::Values::None);
 
    jv[jss::TransactionType] = jss::AMMDelete;
 
    return jv;
}
 
void
AMM::ammDelete(AccountID const& account, std::optional<Ter> const& ter)
{
    json::Value jv = deleteJv(account, asset1_.asset(), asset2_.asset());
    if (fee_ != 0)
        jv[jss::Fee] = std::to_string(fee_);
    submit(jv, std::nullopt, ter);
}
 
namespace amm {
 
json::Value
ammClawback(
    Account const& issuer,
    Account const& holder,
    Asset const& asset,
    Asset const& asset2,
    std::optional<STAmount> const& amount)
{
    json::Value jv;
    jv[jss::TransactionType] = jss::AMMClawback;
    jv[jss::Account] = issuer.human();
    jv[jss::Holder] = holder.human();
    jv[jss::Asset] = toJson(asset);
    jv[jss::Asset2] = toJson(asset2);
    if (amount)
        jv[jss::Amount] = amount->getJson(JsonOptions::Values::None);
 
    return jv;
}
}  // namespace amm
}  // namespace xrpl::test::jtx