{
    "Function": "getOpenNotionalWhileReducingPosition",
    "File": "contracts/AMM.sol",
    "Parent Contracts": [
        "contracts/legos/Governable.sol",
        "node_modules/@openzeppelin/contracts/proxy/utils/Initializable.sol",
        "contracts/legos/Governable.sol",
        "contracts/Interfaces.sol"
    ],
    "High-Level Calls": [
        "SafeCast",
        "SafeCast",
        "SafeCast",
        "SafeCast"
    ],
    "Internal Calls": [
        "abs",
        "abs",
        "abs",
        "abs",
        "require(bool,string)"
    ],
    "Library Calls": [
        "toUint256",
        "toInt256",
        "toUint256",
        "toInt256"
    ],
    "Low-Level Calls": [],
    "Code": "function getOpenNotionalWhileReducingPosition(\n        int256 positionSize,\n        uint256 newNotionalPosition,\n        int256 unrealizedPnl,\n        int256 baseAssetQuantity\n    )\n        override\n        public\n        pure\n        returns(uint256 remainOpenNotional, int realizedPnl)\n    {\n        require(abs(positionSize) >= abs(baseAssetQuantity), \"AMM.ONLY_REDUCE_POS\");\n        bool isLongPosition = positionSize > 0 ? true : false;\n\n        realizedPnl = unrealizedPnl * abs(baseAssetQuantity) / abs(positionSize);\n        int256 unrealizedPnlAfter = unrealizedPnl - realizedPnl;\n\n        /**\n        * We need to determine the openNotional value of the reduced position now.\n        * We know notionalPosition and unrealizedPnlAfter (unrealizedPnl times the ratio of open position)\n        * notionalPosition = notionalPosition - quoteAsset (exchangedQuoteAssetAmount)\n        * calculate openNotional (it's different depends on long or short side)\n        * long: unrealizedPnl = notionalPosition - openNotional => openNotional = notionalPosition - unrealizedPnl\n        * short: unrealizedPnl = openNotional - notionalPosition => openNotional = notionalPosition + unrealizedPnl\n        */\n        if (isLongPosition) {\n            /**\n            * Let baseAssetQuantity = Q, position.size = size, by definition of _reducePosition, abs(size) >= abs(Q)\n            * quoteAsset = notionalPosition * Q / size\n            * unrealizedPnlAfter = unrealizedPnl - realizedPnl = unrealizedPnl - unrealizedPnl * Q / size\n            * remainOpenNotional = notionalPosition - notionalPosition * Q / size - unrealizedPnl + unrealizedPnl * Q / size\n            * => remainOpenNotional = notionalPosition(size-Q)/size - unrealizedPnl(size-Q)/size\n            * => remainOpenNotional = (notionalPosition - unrealizedPnl) * (size-Q)/size\n            * Since notionalPosition includes the PnL component, notionalPosition >= unrealizedPnl and size >= Q\n            * Hence remainOpenNotional >= 0\n            */\n            remainOpenNotional = (newNotionalPosition.toInt256() - unrealizedPnlAfter).toUint256();  // will assert that remainOpenNotional >= 0\n        } else {\n            /**\n            * Let baseAssetQuantity = Q, position.size = size, by definition of _reducePosition, abs(size) >= abs(Q)\n            * quoteAsset = notionalPosition * Q / size\n            * unrealizedPnlAfter = unrealizedPnl - realizedPnl = unrealizedPnl - unrealizedPnl * Q / size\n            * remainOpenNotional = notionalPosition - notionalPosition * Q / size + unrealizedPnl - unrealizedPnl * Q / size\n            * => remainOpenNotional = notionalPosition(size-Q)/size + unrealizedPnl(size-Q)/size\n            * => remainOpenNotional = (notionalPosition + unrealizedPnl) * (size-Q)/size\n            * => In AMM.sol, unrealizedPnl = position.openNotional - notionalPosition\n            * => notionalPosition + unrealizedPnl >= 0\n            * Hence remainOpenNotional >= 0\n            */\n            remainOpenNotional = (newNotionalPosition.toInt256() + unrealizedPnlAfter).toUint256();  // will assert that remainOpenNotional >= 0\n        }\n    }"
}