// SPDX-License-Identifier: AGPL-3.0-or-later
pragma solidity ^0.6.12;

import {UsddJoinAbstract} from "dss-interfaces/dss/UsddJoinAbstract.sol";
import {UsddAbstract} from "dss-interfaces/dss/UsddAbstract.sol";
import {VatAbstract} from "dss-interfaces/dss/VatAbstract.sol";

interface AuthGemJoinAbstract {
    function dec() external view returns (uint256);

    function vat() external view returns (address);

    function ilk() external view returns (bytes32);

    function join(address, uint256, address) external;

    function exit(address, uint256) external;
}

// USDD Peg Stability Module for USDT
contract UsddPsm {

    // --- Auth ---
    mapping(address => uint256) public wards;

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

    function deny(address usr) external auth {wards[usr] = 0;
        emit Deny(usr);}
    modifier auth {require(wards[msg.sender] == 1, "UsddPsm/not-authorized");
        _;}

    VatAbstract immutable public vat;
    AuthGemJoinAbstract immutable public gemJoin;   // Stablecoin Join adapter
    UsddAbstract immutable public usdd;             // USDD token
    UsddJoinAbstract immutable public usddJoin;     // USDD Join adapter
    bytes32 immutable public ilk;                   // Collateral type
    address immutable public vow;                   // System treasury

    uint256 immutable internal to18ConversionFactor;

    // --- State Variables ---
    uint256 public tin;         // Fee in [wad]
    uint256 public tout;        // Fee out [wad]
    uint256 public sellEnabled; // Stablecoin -> USDD enabled
    uint256 public buyEnabled;  // USDD -> Stablecoin enabled

    // --- Events ---
    event Rely(address indexed usr);
    event Deny(address indexed usr);
    event File(bytes32 indexed what, uint256 data);
    event SellGem(address indexed owner, uint256 value, uint256 fee);
    event BuyGem(address indexed owner, uint256 value, uint256 fee);

    // --- Init ---
    constructor(
        address gemJoin_,    // Stablecoin Join adapter
        address usddJoin_,   // USDD Join adapter
        address vow_         // System treasury
    ) public {
        wards[msg.sender] = 1;
        emit Rely(msg.sender);

        AuthGemJoinAbstract gemJoin__ = gemJoin = AuthGemJoinAbstract(gemJoin_);
        UsddJoinAbstract usddJoin__ = usddJoin = UsddJoinAbstract(usddJoin_);
        VatAbstract vat__ = vat = VatAbstract(address(gemJoin__.vat()));
        UsddAbstract usdd__ = usdd = UsddAbstract(address(usddJoin__.usdd()));

        ilk = gemJoin__.ilk();
        vow = vow_;

        // Handle decimals conversion
        to18ConversionFactor = 10 ** (18 - gemJoin__.dec());

        // Set initial state
        sellEnabled = 1;  // Enable by default
        buyEnabled = 1;   // Enable by default

        // Approve max amount for USDD transfers
        usdd__.approve(usddJoin_, uint256(-1));
        vat__.hope(usddJoin_);
    }

    // --- Math ---
    uint256 constant WAD = 10 ** 18;
    uint256 constant RAY = 10 ** 27;

    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x + y) >= x, "UsddPsm/add-overflow");
    }

    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x - y) <= x, "UsddPsm/sub-underflow");
    }

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x, "UsddPsm/mul-overflow");
    }

    // --- Administration ---
    function file(bytes32 what, uint256 data) external auth {
        if (what == "tin") tin = data;
        else if (what == "tout") tout = data;
        else if (what == "sellEnabled") {
            sellEnabled = data;
        }
        else if (what == "buyEnabled") {
            buyEnabled = data;
        }
        else revert("UsddPsm/file-unrecognized-param");

        emit File(what, data);
    }

    // --- Upgrade Path ---
    function hope(address usr) external auth {
        vat.hope(usr);
    }

    function nope(address usr) external auth {
        vat.nope(usr);
    }

    // --- Primary Functions ---

    // Sell USDT for USDD
    function sellGem(address usr, uint256 gemAmt) external {
        require(sellEnabled == 1, "UsddPsm/sell-not-enabled");

        uint256 gemAmt18 = mul(gemAmt, to18ConversionFactor);
        uint256 fee = mul(gemAmt18, tin) / WAD;
        uint256 usddAmt = sub(gemAmt18, fee);

        // Transfer USDT in and mint USDD
        gemJoin.join(address(this), gemAmt, msg.sender);
        vat.frob(ilk, address(this), address(this), address(this), int256(gemAmt18), int256(gemAmt18));

        // Send fee to system treasury
        vat.move(address(this), vow, mul(fee, RAY));

        // Send USDD to user
        usddJoin.exit(usr, usddAmt);

        emit SellGem(usr, gemAmt, fee);
    }

    // Buy USDT with USDD
    function buyGem(address usr, uint256 gemAmt) external {
        require(buyEnabled == 1, "UsddPsm/buy-not-enabled");

        uint256 gemAmt18 = mul(gemAmt, to18ConversionFactor);
        uint256 fee = mul(gemAmt18, tout) / WAD;
        uint256 usddAmt = add(gemAmt18, fee);

        // Transfer USDD in
        require(usdd.transferFrom(msg.sender, address(this), usddAmt), "UsddPsm/failed-transfer");
        usddJoin.join(address(this), usddAmt);

        // Burn USDD and release USDT
        vat.frob(ilk, address(this), address(this), address(this), - int256(gemAmt18), - int256(gemAmt18));
        gemJoin.exit(usr, gemAmt);

        // Send fee to system treasury
        vat.move(address(this), vow, mul(fee, RAY));

        emit BuyGem(usr, gemAmt, fee);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;

interface UsddJoinAbstract {
    function wards(address) external view returns (uint256);
    function rely(address usr) external;
    function deny(address usr) external;
    function vat() external view returns (address);
    function usdd() external view returns (address);
    function live() external view returns (uint256);
    function cage() external;
    function join(address, uint256) external;
    function exit(address, uint256) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;

interface UsddAbstract {
    function wards(address) external view returns (uint256);
    function rely(address) external;
    function deny(address) external;
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function version() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address) external view returns (uint256);
    function allowance(address, address) external view returns (uint256);
    function nonces(address) external view returns (uint256);
    function DOMAIN_SEPARATOR() external view returns (bytes32);
    function PERMIT_TYPEHASH() external view returns (bytes32);
    function transfer(address, uint256) external returns (bool);
    function transferFrom(address, address, uint256) external returns (bool);
    function mint(address, uint256) external;
    function burn(address, uint256) external;
    function approve(address, uint256) external returns (bool);
    function push(address, uint256) external;
    function pull(address, uint256) external;
    function move(address, address, uint256) external;
    function permit(address, address, uint256, uint256, bool, uint8, bytes32, bytes32) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;

interface VatAbstract {
    function wards(address) external view returns (uint256);
    function rely(address) external;
    function deny(address) external;
    function can(address, address) external view returns (uint256);
    function hope(address) external;
    function nope(address) external;
    function ilks(bytes32) external view returns (uint256, uint256, uint256, uint256, uint256);
    function urns(bytes32, address) external view returns (uint256, uint256);
    function gem(bytes32, address) external view returns (uint256);
    function dai(address) external view returns (uint256);
    function sin(address) external view returns (uint256);
    function debt() external view returns (uint256);
    function vice() external view returns (uint256);
    function Line() external view returns (uint256);
    function live() external view returns (uint256);
    function init(bytes32) external;
    function file(bytes32, uint256) external;
    function file(bytes32, bytes32, uint256) external;
    function cage() external;
    function slip(bytes32, address, int256) external;
    function flux(bytes32, address, address, uint256) external;
    function move(address, address, uint256) external;
    function frob(bytes32, address, address, address, int256, int256) external;
    function fork(bytes32, address, address, int256, int256) external;
    function grab(bytes32, address, address, address, int256, int256) external;
    function heal(uint256) external;
    function suck(address, address, uint256) external;
    function fold(bytes32, address, int256) external;
}

{
  "remappings": [
    "ds-test/=lib/ds-auth/lib/ds-test/src/",
    "ds-thing/=lib/ds-value/lib/ds-thing/src/",
    "ds-value/=lib/ds-value/src/",
    "forge-std/=lib/forge-std/src/",
    "psm/=lib/psm/src/",
    "ds-token/=lib/ds-token/src/",
    "ds-auth/=lib/ds-auth/src/",
    "erc4626-tests/=lib/erc4626-tests/",
    "ds-math/=lib/ds-token/lib/ds-math/src/",
    "ds-note/=lib/ds-value/lib/ds-thing/lib/ds-note/src/",
    "dss-interfaces/=lib/psm/lib/dss-interfaces/src/",
    "usddv2/=lib/psm/lib/usddv2/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "istanbul"
}

• No Contract Security Audit Submitted- Submit Audit Here

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