{
    "Function": "buy",
    "File": "contracts/Witch.sol",
    "Parent Contracts": [
        "contracts/utils/access/AccessControl.sol"
    ],
    "High-Level Calls": [
        "ICauldron",
        "WMul",
        "ICauldron",
        "CastU256U128",
        "CastU256U128",
        "ICauldron",
        "CastU256U128",
        "ICauldron",
        "ICauldron",
        "ICauldron"
    ],
    "Internal Calls": [
        "settle",
        "require(bool,string)",
        "require(bool,string)",
        "inkPrice",
        "require(bool,string)"
    ],
    "Library Calls": [
        "wmul",
        "u128",
        "u128",
        "u128"
    ],
    "Low-Level Calls": [],
    "Code": "function buy(bytes12 vaultId, uint128 base, uint128 min)\n        external\n        returns (uint256 ink)\n    {\n        DataTypes.Balances memory balances_ = cauldron.balances(vaultId);\n        DataTypes.Vault memory vault_ = cauldron.vaults(vaultId);\n        DataTypes.Series memory series_ = cauldron.series(vault_.seriesId);\n        Auction memory auction_ = auctions[vaultId];\n        Ilk memory ilk_ = ilks[vault_.ilkId];\n\n        require (balances_.art > 0, \"Nothing to buy\");                                      // Cheapest way of failing gracefully if given a non existing vault\n        uint256 art = cauldron.debtFromBase(vault_.seriesId, base);\n        {\n            uint256 elapsed = uint32(block.timestamp) - auction_.start;                      // Auctions will malfunction on the 7th of February 2106, at 06:28:16 GMT, we should replace this contract before then.\n            uint256 price = inkPrice(balances_, ilk_.initialOffer, ilk_.duration, elapsed);\n            ink = uint256(art).wmul(price);                                                    // Calculate collateral to sell. Using divdrup stops rounding from leaving 1 stray wei in vaults.\n            require (ink >= min, \"Not enough bought\");\n            require (ink == balances_.ink || balances_.ink - ink >= ilk_.dust, \"Leaves dust\");\n        }\n\n        cauldron.slurp(vaultId, ink.u128(), art.u128());                                            // Remove debt and collateral from the vault\n        settle(msg.sender, vault_.ilkId, series_.baseId, ink.u128(), base);                   // Move the assets\n        if (balances_.art - art == 0) {                                                             // If there is no debt left, return the vault with the collateral to the owner\n            cauldron.give(vaultId, auction_.owner);\n            delete auctions[vaultId];\n        }\n\n        emit Bought(vaultId, msg.sender, ink, art);\n    }"
}