{
    "Function": "_getAmountsIn",
    "File": "src/LBRouter.sol",
    "Parent Contracts": [
        "src/interfaces/ILBRouter.sol"
    ],
    "High-Level Calls": [
        "ILBPair",
        "IJoePair"
    ],
    "Internal Calls": [
        "getSwapIn"
    ],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "function _getAmountsIn(\n        uint256[] memory _pairBinSteps,\n        address[] memory _pairs,\n        IERC20[] memory _tokenPath,\n        uint256 _amountOut\n    ) private view returns (uint256[] memory amountsIn) {\n        amountsIn = new uint256[](_tokenPath.length);\n        // Avoid doing -1, as `_pairs.length == _pairBinSteps.length-1`\n        amountsIn[_pairs.length] = _amountOut;\n\n        for (uint256 i = _pairs.length; i != 0; i--) {\n            IERC20 _token = _tokenPath[i - 1];\n            uint256 _binStep = _pairBinSteps[i - 1];\n\n            address _pair = _pairs[i - 1];\n\n            if (_binStep == 0) {\n                (uint256 _reserveIn, uint256 _reserveOut, ) = IJoePair(_pair).getReserves();\n                if (_token > _tokenPath[i]) {\n                    (_reserveIn, _reserveOut) = (_reserveOut, _reserveIn);\n                }\n\n                uint256 amountOut_ = amountsIn[i];\n                // Legacy uniswap way of rounding\n                amountsIn[i - 1] = (_reserveIn * amountOut_ * 1_000) / (_reserveOut - amountOut_ * 997) + 1;\n            } else {\n                (amountsIn[i - 1], ) = getSwapIn(ILBPair(_pair), amountsIn[i], ILBPair(_pair).tokenX() == _token);\n            }\n        }\n    }"
}