{
    "Function": "purchaseArbitrageTokens",
    "File": "contracts/Auction/AuctionParticipant.sol",
    "Parent Contracts": [
        "contracts/StabilizedPoolExtensions/AuctionExtension.sol",
        "contracts/StabilizedPoolExtensions/StabilizedPoolUnit.sol",
        "contracts/Permissions.sol",
        "lib/openzeppelin-contracts/contracts/security/ReentrancyGuard.sol",
        "lib/openzeppelin-contracts/contracts/access/AccessControl.sol",
        "lib/openzeppelin-contracts/contracts/utils/introspection/ERC165.sol",
        "lib/openzeppelin-contracts/contracts/utils/introspection/IERC165.sol",
        "lib/openzeppelin-contracts/contracts/access/IAccessControl.sol",
        "lib/openzeppelin-contracts/contracts/utils/Context.sol"
    ],
    "High-Level Calls": [
        "SafeERC20",
        "SafeERC20",
        "IAuction",
        "SafeERC20",
        "IAuction",
        "IAuction"
    ],
    "Internal Calls": [
        "usableBalance",
        "nonReentrant",
        "onlyActive",
        "onlyRoleMalt"
    ],
    "Library Calls": [
        "safeApprove",
        "safeApprove",
        "safeApprove"
    ],
    "Low-Level Calls": [],
    "Code": "function purchaseArbitrageTokens(uint256 maxAmount)\n    external\n    onlyRoleMalt(\n      PURCHASE_TRIGGER_ROLE,\n      \"Must have implied collateral service privs\"\n    )\n    nonReentrant\n    onlyActive\n    returns (uint256 remaining)\n  {\n    // Just to make sure we are starting from 0\n    collateralToken.safeApprove(address(auction), 0);\n\n    uint256 balance = usableBalance();\n\n    if (balance == 0) {\n      return maxAmount;\n    }\n\n    if (maxAmount < balance) {\n      balance = maxAmount;\n    }\n\n    uint256 currentAuction = auction.currentAuctionId();\n\n    if (!auction.auctionActive(currentAuction)) {\n      return maxAmount;\n    }\n\n    // First time participating in this auction\n    if (idIndex[currentAuction] == 0) {\n      auctionIds.push(currentAuction);\n      idIndex[currentAuction] = auctionIds.length;\n    }\n\n    collateralToken.safeApprove(address(auction), balance);\n    auction.purchaseArbitrageTokens(balance, 0); // 0 min due to blocking buys\n\n    // Reset approval\n    collateralToken.safeApprove(address(auction), 0);\n\n    return maxAmount - balance;\n  }"
}