// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

import {IERC20} from "openzeppelin/contracts/interfaces/IERC20.sol";
import {IERC20Permit} from "openzeppelin/contracts/token/ERC20/extensions/IERC20Permit.sol";

import {IUserProxy} from "./interfaces/IUserProxy.sol";
import {ILQTYStaking} from "./interfaces/ILQTYStaking.sol";
import {PermitParams} from "./utils/Types.sol";

contract UserProxy is IUserProxy {
    /// @inheritdoc IUserProxy
    IERC20 public immutable lqty;
    /// @inheritdoc IUserProxy
    IERC20 public immutable lusd;

    /// @inheritdoc IUserProxy
    ILQTYStaking public immutable stakingV1;
    /// @inheritdoc IUserProxy
    address public immutable stakingV2;

    constructor(address _lqty, address _lusd, address _stakingV1) {
        lqty = IERC20(_lqty);
        lusd = IERC20(_lusd);
        stakingV1 = ILQTYStaking(_stakingV1);
        stakingV2 = msg.sender;
    }

    modifier onlyStakingV2() {
        require(msg.sender == stakingV2, "UserProxy: caller-not-stakingV2");
        _;
    }

    /// @inheritdoc IUserProxy
    function stake(uint256 _amount, address _lqtyFrom, bool _doSendRewards, address _recipient)
        public
        onlyStakingV2
        returns (uint256 lusdReceived, uint256 lusdSent, uint256 ethReceived, uint256 ethSent)
    {
        uint256 initialLUSDAmount = lusd.balanceOf(address(this));
        uint256 initialETHAmount = address(this).balance;

        lqty.transferFrom(_lqtyFrom, address(this), _amount);
        stakingV1.stake(_amount);

        uint256 lusdAmount = lusd.balanceOf(address(this));
        uint256 ethAmount = address(this).balance;

        lusdReceived = lusdAmount - initialLUSDAmount;
        ethReceived = ethAmount - initialETHAmount;

        if (_doSendRewards) (lusdSent, ethSent) = _sendRewards(_recipient, lusdAmount, ethAmount);
    }

    /// @inheritdoc IUserProxy
    function stakeViaPermit(
        uint256 _amount,
        address _lqtyFrom,
        PermitParams calldata _permitParams,
        bool _doSendRewards,
        address _recipient
    ) external onlyStakingV2 returns (uint256 lusdReceived, uint256 lusdSent, uint256 ethReceived, uint256 ethSent) {
        require(_lqtyFrom == _permitParams.owner, "UserProxy: owner-not-sender");

        try IERC20Permit(address(lqty)).permit(
            _permitParams.owner,
            _permitParams.spender,
            _permitParams.value,
            _permitParams.deadline,
            _permitParams.v,
            _permitParams.r,
            _permitParams.s
        ) {} catch {}

        return stake(_amount, _lqtyFrom, _doSendRewards, _recipient);
    }

    /// @inheritdoc IUserProxy
    function unstake(uint256 _amount, bool _doSendRewards, address _recipient)
        external
        onlyStakingV2
        returns (
            uint256 lqtyReceived,
            uint256 lqtySent,
            uint256 lusdReceived,
            uint256 lusdSent,
            uint256 ethReceived,
            uint256 ethSent
        )
    {
        uint256 initialLQTYAmount = lqty.balanceOf(address(this));
        uint256 initialLUSDAmount = lusd.balanceOf(address(this));
        uint256 initialETHAmount = address(this).balance;

        stakingV1.unstake(_amount);

        lqtySent = lqty.balanceOf(address(this));
        uint256 lusdAmount = lusd.balanceOf(address(this));
        uint256 ethAmount = address(this).balance;

        lqtyReceived = lqtySent - initialLQTYAmount;
        lusdReceived = lusdAmount - initialLUSDAmount;
        ethReceived = ethAmount - initialETHAmount;

        if (lqtySent > 0) lqty.transfer(_recipient, lqtySent);
        if (_doSendRewards) (lusdSent, ethSent) = _sendRewards(_recipient, lusdAmount, ethAmount);
    }

    function _sendRewards(address _recipient, uint256 _lusdAmount, uint256 _ethAmount)
        internal
        returns (uint256 lusdSent, uint256 ethSent)
    {
        if (_lusdAmount > 0) lusd.transfer(_recipient, _lusdAmount);
        if (_ethAmount > 0) {
            (bool success,) = payable(_recipient).call{value: _ethAmount}("");
            require(success, "UserProxy: eth-fail");
        }

        return (_lusdAmount, _ethAmount);
    }

    /// @inheritdoc IUserProxy
    function staked() external view returns (uint256) {
        return stakingV1.stakes(address(this));
    }

    receive() external payable {}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../token/ERC20/IERC20.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import {IERC20} from "openzeppelin/contracts/interfaces/IERC20.sol";

import {ILQTYStaking} from "../interfaces/ILQTYStaking.sol";

import {PermitParams} from "../utils/Types.sol";

interface IUserProxy {
    /// @notice Address of the LQTY token
    /// @return lqty Address of the LQTY token
    function lqty() external view returns (IERC20 lqty);
    /// @notice Address of the LUSD token
    /// @return lusd Address of the LUSD token
    function lusd() external view returns (IERC20 lusd);
    /// @notice Address of the V1 LQTY staking contract
    /// @return stakingV1 Address of the V1 LQTY staking contract
    function stakingV1() external view returns (ILQTYStaking stakingV1);
    /// @notice Address of the V2 LQTY staking contract
    /// @return stakingV2 Address of the V2 LQTY staking contract
    function stakingV2() external view returns (address stakingV2);

    /// @notice Stakes a given amount of LQTY tokens in the V1 staking contract
    /// @dev The LQTY tokens must be approved for transfer by the user
    /// @param _amount Amount of LQTY tokens to stake
    /// @param _lqtyFrom Address from which to transfer the LQTY tokens
    /// @param _doSendRewards If true, send rewards claimed from LQTY staking
    /// @param _recipient Address to which the tokens should be sent
    /// @return lusdReceived Amount of LUSD tokens received as a side-effect of staking new LQTY
    /// @return lusdSent Amount of LUSD tokens sent to `_recipient` (may include previously received LUSD)
    /// @return ethReceived Amount of ETH received as a side-effect of staking new LQTY
    /// @return ethSent Amount of ETH sent to `_recipient` (may include previously received ETH)
    function stake(uint256 _amount, address _lqtyFrom, bool _doSendRewards, address _recipient)
        external
        returns (uint256 lusdReceived, uint256 lusdSent, uint256 ethReceived, uint256 ethSent);

    /// @notice Stakes a given amount of LQTY tokens in the V1 staking contract using a permit
    /// @param _amount Amount of LQTY tokens to stake
    /// @param _lqtyFrom Address from which to transfer the LQTY tokens
    /// @param _permitParams Parameters for the permit data
    /// @param _doSendRewards If true, send rewards claimed from LQTY staking
    /// @param _recipient Address to which the tokens should be sent
    /// @return lusdReceived Amount of LUSD tokens received as a side-effect of staking new LQTY
    /// @return lusdSent Amount of LUSD tokens sent to `_recipient` (may include previously received LUSD)
    /// @return ethReceived Amount of ETH received as a side-effect of staking new LQTY
    /// @return ethSent Amount of ETH sent to `_recipient` (may include previously received ETH)
    function stakeViaPermit(
        uint256 _amount,
        address _lqtyFrom,
        PermitParams calldata _permitParams,
        bool _doSendRewards,
        address _recipient
    ) external returns (uint256 lusdReceived, uint256 lusdSent, uint256 ethReceived, uint256 ethSent);

    /// @notice Unstakes a given amount of LQTY tokens from the V1 staking contract and claims the accrued rewards
    /// @param _amount Amount of LQTY tokens to unstake
    /// @param _doSendRewards If true, send rewards claimed from LQTY staking
    /// @param _recipient Address to which the tokens should be sent
    /// @return lqtyReceived Amount of LQTY tokens actually unstaked (may be lower than `_amount`)
    /// @return lqtySent Amount of LQTY tokens sent to `_recipient` (may include LQTY sent to the proxy from sources other than V1 staking)
    /// @return lusdReceived Amount of LUSD tokens received as a side-effect of staking new LQTY
    /// @return lusdSent Amount of LUSD tokens claimed (may include previously received LUSD)
    /// @return ethReceived Amount of ETH received as a side-effect of staking new LQTY
    /// @return ethSent Amount of ETH claimed (may include previously received ETH)
    function unstake(uint256 _amount, bool _doSendRewards, address _recipient)
        external
        returns (
            uint256 lqtyReceived,
            uint256 lqtySent,
            uint256 lusdReceived,
            uint256 lusdSent,
            uint256 ethReceived,
            uint256 ethSent
        );

    /// @notice Returns the current amount LQTY staked by a user in the V1 staking contract
    /// @return staked Amount of LQTY tokens staked
    function staked() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

interface ILQTYStaking {
    // --- Events --

    event LQTYTokenAddressSet(address _lqtyTokenAddress);
    event LUSDTokenAddressSet(address _lusdTokenAddress);
    event TroveManagerAddressSet(address _troveManager);
    event BorrowerOperationsAddressSet(address _borrowerOperationsAddress);
    event ActivePoolAddressSet(address _activePoolAddress);

    event StakeChanged(address indexed staker, uint256 newStake);
    event StakingGainsWithdrawn(address indexed staker, uint256 LUSDGain, uint256 ETHGain);
    event F_ETHUpdated(uint256 _F_ETH);
    event F_LUSDUpdated(uint256 _F_LUSD);
    event TotalLQTYStakedUpdated(uint256 _totalLQTYStaked);
    event EtherSent(address _account, uint256 _amount);
    event StakerSnapshotsUpdated(address _staker, uint256 _F_ETH, uint256 _F_LUSD);

    // --- Functions ---

    function setAddresses(
        address _lqtyTokenAddress,
        address _lusdTokenAddress,
        address _troveManagerAddress,
        address _borrowerOperationsAddress,
        address _activePoolAddress
    ) external;

    function stake(uint256 _LQTYamount) external;

    function unstake(uint256 _LQTYamount) external;

    function increaseF_ETH(uint256 _ETHFee) external;

    function increaseF_LUSD(uint256 _LQTYFee) external;

    function getPendingETHGain(address _user) external view returns (uint256);

    function getPendingLUSDGain(address _user) external view returns (uint256);

    function stakes(address _user) external view returns (uint256);

    function totalLQTYStaked() external view returns (uint256);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

struct PermitParams {
    address owner;
    address spender;
    uint256 value;
    uint256 deadline;
    uint8 v;
    bytes32 r;
    bytes32 s;
}

uint256 constant WAD = 1e18;

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 value) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 value) external returns (bool);
}

{
  "remappings": [
    "openzeppelin/=lib/V2-gov/lib/openzeppelin-contracts/",
    "@chimera/=lib/V2-gov/lib/chimera/src/",
    "@openzeppelin/contracts/=lib/V2-gov/lib/openzeppelin-contracts/contracts/",
    "Solady/=lib/Solady/src/",
    "V2-gov/=lib/V2-gov/",
    "chimera/=lib/V2-gov/lib/chimera/src/",
    "ds-test/=lib/openzeppelin-contracts/lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "v4-core/=lib/V2-gov/lib/v4-core/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "cancun",
  "viaIR": false,
  "libraries": {}
}

[{"inputs":[{"internalType":"address","name":"_lqty","type":"address"},{"internalType":"address","name":"_lusd","type":"address"},{"internalType":"address","name":"_stakingV1","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"lqty","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"lusd","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address","name":"_lqtyFrom","type":"address"},{"internalType":"bool","name":"_doSendRewards","type":"bool"},{"internalType":"address","name":"_recipient","type":"address"}],"name":"stake","outputs":[{"internalType":"uint256","name":"lusdReceived","type":"uint256"},{"internalType":"uint256","name":"lusdSent","type":"uint256"},{"internalType":"uint256","name":"ethReceived","type":"uint256"},{"internalType":"uint256","name":"ethSent","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address","name":"_lqtyFrom","type":"address"},{"components":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"internalType":"struct PermitParams","name":"_permitParams","type":"tuple"},{"internalType":"bool","name":"_doSendRewards","type":"bool"},{"internalType":"address","name":"_recipient","type":"address"}],"name":"stakeViaPermit","outputs":[{"internalType":"uint256","name":"lusdReceived","type":"uint256"},{"internalType":"uint256","name":"lusdSent","type":"uint256"},{"internalType":"uint256","name":"ethReceived","type":"uint256"},{"internalType":"uint256","name":"ethSent","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"staked","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"stakingV1","outputs":[{"internalType":"contract ILQTYStaking","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"stakingV2","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bool","name":"_doSendRewards","type":"bool"},{"internalType":"address","name":"_recipient","type":"address"}],"name":"unstake","outputs":[{"internalType":"uint256","name":"lqtyReceived","type":"uint256"},{"internalType":"uint256","name":"lqtySent","type":"uint256"},{"internalType":"uint256","name":"lusdReceived","type":"uint256"},{"internalType":"uint256","name":"lusdSent","type":"uint256"},{"internalType":"uint256","name":"ethReceived","type":"uint256"},{"internalType":"uint256","name":"ethSent","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]