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// SPDX-FileCopyrightText: © 2023 Dai Foundation <www.daifoundation.org>
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

pragma solidity ^0.8.21;

import { Babylonian } from "src/Babylonian.sol";

interface SpotterLike {
    function par() external view returns (uint256);
}

interface GemLike {
    function decimals() external view returns (uint8);
    function balanceOf(address) external view returns (uint256);
    function transfer(address, uint256) external;
}

interface PipLike {
    function read() external view returns (bytes32);
}

// https://github.com/Uniswap/v2-core/blob/ee547b17853e71ed4e0101ccfd52e70d5acded58/contracts/UniswapV2Pair.sol
interface PairLike {
    function getReserves() external view returns (uint112, uint112, uint32);
    function token0() external view returns (address);
    function mint(address) external returns (uint256);
    function swap(uint256, uint256, address, bytes calldata) external;
    function sync() external;
}

contract FlapperUniV2 {
    mapping (address => uint256) public wards;

    PipLike public pip;   // Reference price oracle
    uint256 public want;  // [WAD]        Relative multiplier of the reference price to insist on in the swap.
                          //              For example: 0.98 * WAD allows 2% worse price than the reference.

    SpotterLike public immutable spotter;
    address     public immutable usds;
    address     public immutable gem;
    address     public immutable receiver;

    PairLike    public immutable pair;
    bool        public immutable usdsFirst;

    event Rely(address indexed usr);
    event Deny(address indexed usr);
    event File(bytes32 indexed what, uint256 data);
    event File(bytes32 indexed what, address data);
    event Exec(uint256 lot, uint256 sell, uint256 buy, uint256 liquidity);

    constructor(
        address _spotter,
        address _usds,
        address _gem,
        address _pair,
        address _receiver
    ) {
        spotter = SpotterLike(_spotter);

        usds = _usds;
        gem  = _gem;
        require(GemLike(gem).decimals() == 18, "FlapperUniV2/gem-decimals-not-18");

        pair      = PairLike(_pair);
        usdsFirst = pair.token0() == usds;
        receiver  = _receiver;

        wards[msg.sender] = 1;
        emit Rely(msg.sender);

        want = WAD; // Initial value for safety
    }

    modifier auth {
        require(wards[msg.sender] == 1, "FlapperUniV2/not-authorized");
        _;
    }

    uint256 internal constant WAD = 10 ** 18;
    uint256 internal constant RAY = 10 ** 27;

    function rely(address usr) external auth { wards[usr] = 1; emit Rely(usr); }
    function deny(address usr) external auth { wards[usr] = 0; emit Deny(usr); }

    // Warning - low `want` values increase the susceptibility to oracle manipulation attacks
    function file(bytes32 what, uint256 data) external auth {
        if (what == "want") want = data;
        else revert("FlapperUniV2/file-unrecognized-param");
        emit File(what, data);
    }

    function file(bytes32 what, address data) external auth {
        if (what == "pip") pip = PipLike(data);
        else revert("FlapperUniV2/file-unrecognized-param");
        emit File(what, data);
    }

    function _getReserves() internal returns (uint256 reserveUsds, uint256 reserveGem) {
        (uint256 _reserveA, uint256 _reserveB,) = pair.getReserves();
        (reserveUsds, reserveGem) = usdsFirst ? (_reserveA, _reserveB) : (_reserveB, _reserveA);

        uint256 _usdsBalance = GemLike(usds).balanceOf(address(pair));
        uint256 _gemBalance  = GemLike(gem).balanceOf(address(pair));
        if (_usdsBalance > reserveUsds || _gemBalance > reserveGem) {
            pair.sync();
            (reserveUsds, reserveGem) = (_usdsBalance, _gemBalance);
        }
    }

    // The Uniswap invariant needs to hold through the swap.
    // Additionally, The deposited funds need to be in the same ratio as the reserves after the swap.
    //
    // (1)   reserveUsds * reserveGem = (reserveUsds + sell * 997 / 1000) * (reserveGem - bought)
    // (2)   (lot - sell) / bought  = (reserveUsds + sell) / (reserveGem - bought)
    //
    // The solution for the these equations for variables `sell` and `bought` is used below.
    function _getUsdsToSell(uint256 lot, uint256 reserveUsds) internal pure returns (uint256 sell) {
        sell = (Babylonian.sqrt(reserveUsds * (lot * 3_988_000 + reserveUsds * 3_988_009)) - reserveUsds * 1997) / 1994;
    }

    // Based on: https://github.com/Uniswap/v2-periphery/blob/0335e8f7e1bd1e8d8329fd300aea2ef2f36dd19f/contracts/libraries/UniswapV2Library.sol#L43
    function _getAmountOut(uint256 amtIn, uint256 reserveIn, uint256 reserveOut) internal pure returns (uint256 amtOut) {
        uint256 _amtInFee = amtIn * 997;
        amtOut = _amtInFee * reserveOut / (reserveIn * 1000 + _amtInFee);
    }

    function exec(uint256 lot) external auth {
        // Check Amounts
        (uint256 _reserveUsds, uint256 _reserveGem) = _getReserves();

        uint256 _sell = _getUsdsToSell(lot, _reserveUsds);

        uint256 _buy = _getAmountOut(_sell, _reserveUsds, _reserveGem);
        require(_buy >= _sell * want / (uint256(pip.read()) * RAY / spotter.par()), "FlapperUniV2/insufficient-buy-amount");
        //

        // Swap
        GemLike(usds).transfer(address(pair), _sell);
        (uint256 _amt0Out, uint256 _amt1Out) = usdsFirst ? (uint256(0), _buy) : (_buy, uint256(0));
        pair.swap(_amt0Out, _amt1Out, address(this), new bytes(0));
        //

        // Deposit
        GemLike(usds).transfer(address(pair), lot - _sell);
        GemLike(gem).transfer(address(pair), _buy);
        uint256 _liquidity = pair.mint(receiver);
        //

        emit Exec(lot, _sell, _buy, _liquidity);
    }
}

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity ^0.8.21;

// Based on https://github.com/Uniswap/solidity-lib/blob/c01640b0f0f1d8a85cba8de378cc48469fcfd9a6/contracts/libraries/Babylonian.sol

// computes square roots using the babylonian method
// https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method
library Babylonian {
    // credit for this implementation goes to
    // https://github.com/abdk-consulting/abdk-libraries-solidity/blob/5e1e7c11b35f8313d3f7ce11c1b86320d7c0b554/ABDKMath64x64.sol#L725
    function sqrt(uint256 x) internal pure returns (uint256) {
        unchecked {
            if (x == 0) return 0;
            // this block is equivalent to r = uint256(1) << (BitMath.mostSignificantBit(x) / 2);
            // however that code costs significantly more gas
            uint256 xx = x;
            uint256 r = 1;
            if (xx >= 0x100000000000000000000000000000000) {
                xx >>= 128;
                r <<= 64;
            }
            if (xx >= 0x10000000000000000) {
                xx >>= 64;
                r <<= 32;
            }
            if (xx >= 0x100000000) {
                xx >>= 32;
                r <<= 16;
            }
            if (xx >= 0x10000) {
                xx >>= 16;
                r <<= 8;
            }
            if (xx >= 0x100) {
                xx >>= 8;
                r <<= 4;
            }
            if (xx >= 0x10) {
                xx >>= 4;
                r <<= 2;
            }
            if (xx >= 0x4) {
                r <<= 1;
            }
            r = (r + x / r) >> 1;
            r = (r + x / r) >> 1;
            r = (r + x / r) >> 1;
            r = (r + x / r) >> 1;
            r = (r + x / r) >> 1;
            r = (r + x / r) >> 1;
            r = (r + x / r) >> 1; // Seven iterations should be enough
            uint256 r1 = x / r;
            return (r < r1 ? r : r1);
        }
    }
}

{
  "remappings": [
    "dss-interfaces/=lib/dss-test/lib/dss-interfaces/src/",
    "dss-test/=lib/dss-test/src/",
    "forge-std/=lib/dss-test/lib/forge-std/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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00000000000000000000000065c79fcb50ca1594b025960e539ed7a9a6d434a3000000000000000000000000dc035d45d973e3ec169d2276ddab16f1e407384f00000000000000000000000056072c95faa701256059aa122697b133aded92790000000000000000000000002621cc0b3f3c079c1db0e80794aa24976f0b9e3c000000000000000000000000be8e3e3618f7474f8cb1d074a26affef007e98fb

-----Decoded View---------------
Arg [0] : _spotter (address): 0x65C79fcB50Ca1594B025960e539eD7A9a6D434A3
Arg [1] : _usds (address): 0xdC035D45d973E3EC169d2276DDab16f1e407384F
Arg [2] : _gem (address): 0x56072C95FAA701256059aa122697B133aDEd9279
Arg [3] : _pair (address): 0x2621CC0B3F3c079c1Db0E80794AA24976F0b9e3c
Arg [4] : _receiver (address): 0xBE8E3e3618f7474F8cB1d074A26afFef007E98FB

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 00000000000000000000000065c79fcb50ca1594b025960e539ed7a9a6d434a3
Arg [1] : 000000000000000000000000dc035d45d973e3ec169d2276ddab16f1e407384f
Arg [2] : 00000000000000000000000056072c95faa701256059aa122697b133aded9279
Arg [3] : 0000000000000000000000002621cc0b3f3c079c1db0e80794aa24976f0b9e3c
Arg [4] : 000000000000000000000000be8e3e3618f7474f8cb1d074a26affef007e98fb