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/*

    Copyright 2024 MEST.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.8.16;
import "@openzeppelin/contracts/access/Ownable.sol";
import "../intf/IAave.sol";

interface IYieldTool {
    function yieldDeposit(uint256 amount) external;
    function yieldWithdraw(uint256 amount) external;
    function yieldBalanceOf(address owner) external returns(uint256);
    function yieldToken() external returns(address);
    function yieldMaxWithdrawable(address owner) external returns(uint256 amount);
}

contract YieldTool is Ownable, IYieldTool {
    // for aave   
    address public immutable mestFactory;
    address public immutable WETH;

    IAavePool public aavePool;
    IAaveGateway public aaveGateway;
    IAToken public aWETH;

    constructor(address _mestFactory, address _weth) public {
        mestFactory = _mestFactory;
        WETH = _weth;
    }

    modifier onlyFactory() {
        require(msg.sender == mestFactory, "Only factory");
        _;
    }

    // =============== eth =============

    fallback() external payable {}

    receive() external payable {}

    // ================= owner ================

    function setAaveInfo(address newPool, address newGateway) external onlyOwner {
        if(address(aWETH) != address(0)) {
            require(aWETH.balanceOf(mestFactory) == 0, "AToken didnt withdraw all");
            // revoke allowrance
            aWETH.approve(address(aaveGateway), 0);
        }
        aaveGateway = IAaveGateway(newGateway);
        aavePool = IAavePool(newPool);

        aWETH = IAToken(aavePool.getReserveData(WETH).aTokenAddress);
        aWETH.approve(address(aaveGateway), type(uint256).max);
    }

    // ============= yield function =========

    function yieldDeposit(uint256 amount) external onlyFactory {
        uint256 subTotalPrice = address(this).balance;
        aaveGateway.depositETH{value: subTotalPrice}(address(aavePool), mestFactory, 0);
    }

    function yieldWithdraw(uint256 amount) external onlyFactory {
        aWETH.transferFrom(mestFactory, address(this), amount);
        aaveGateway.withdrawETH(address(aavePool), amount, mestFactory);
    }

    function yieldBalanceOf(address owner) external returns(uint256 amount) {
        return aWETH.balanceOf(owner);
    }

    function yieldToken() external returns(address yieldTokenAddr) {
        yieldTokenAddr = address(aWETH);
    }

    function yieldMaxWithdrawable(address owner) external returns(uint256 amount) {
        return aWETH.balanceOf(owner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

pragma solidity 0.8.16;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IAToken is IERC20 {

}

interface IAavePool {
    struct ReserveConfigurationMap {
        //bit 0-15: LTV
        //bit 16-31: Liq. threshold
        //bit 32-47: Liq. bonus
        //bit 48-55: Decimals
        //bit 56: reserve is active
        //bit 57: reserve is frozen
        //bit 58: borrowing is enabled
        //bit 59: stable rate borrowing enabled
        //bit 60: asset is paused
        //bit 61: borrowing in isolation mode is enabled
        //bit 62: siloed borrowing enabled
        //bit 63: flashloaning enabled
        //bit 64-79: reserve factor
        //bit 80-115 borrow cap in whole tokens, borrowCap == 0 => no cap
        //bit 116-151 supply cap in whole tokens, supplyCap == 0 => no cap
        //bit 152-167 liquidation protocol fee
        //bit 168-175 eMode category
        //bit 176-211 unbacked mint cap in whole tokens, unbackedMintCap == 0 => minting disabled
        //bit 212-251 debt ceiling for isolation mode with (ReserveConfiguration::DEBT_CEILING_DECIMALS) decimals
        //bit 252-255 unused

        uint256 data;
    }

    struct ReserveData {
        //stores the reserve configuration
        ReserveConfigurationMap configuration;
        //the liquidity index. Expressed in ray
        uint128 liquidityIndex;
        //the current supply rate. Expressed in ray
        uint128 currentLiquidityRate;
        //variable borrow index. Expressed in ray
        uint128 variableBorrowIndex;
        //the current variable borrow rate. Expressed in ray
        uint128 currentVariableBorrowRate;
        //the current stable borrow rate. Expressed in ray
        uint128 currentStableBorrowRate;
        //timestamp of last update
        uint40 lastUpdateTimestamp;
        //the id of the reserve. Represents the position in the list of the active reserves
        uint16 id;
        //aToken address
        address aTokenAddress;
        //stableDebtToken address
        address stableDebtTokenAddress;
        //variableDebtToken address
        address variableDebtTokenAddress;
        //address of the interest rate strategy
        address interestRateStrategyAddress;
        //the current treasury balance, scaled
        uint128 accruedToTreasury;
        //the outstanding unbacked aTokens minted through the bridging feature
        uint128 unbacked;
        //the outstanding debt borrowed against this asset in isolation mode
        uint128 isolationModeTotalDebt;
    }

    function getReserveData(address asset) external view returns (ReserveData memory);
}

interface IAaveGateway {
    function withdrawETH(address, uint256 amount, address to) external;
    function depositETH(address, address onBehalfOf, uint16 referralCode) external payable;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @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 amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves `amount` 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 amount) 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 `amount` 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 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` 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 amount
    ) external returns (bool);
}

{
  "remappings": [
    "forge-std/=lib/forge-std/src/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "contracts/=contracts/",
    "@openzeppelin/contracts/=node_modules/@openzeppelin/contracts/",
    "@rari-capital/solmate/src/=node_modules/@rari-capital/solmate/src/",
    "@ensdomains/=node_modules/@ensdomains/",
    "eth-gas-reporter/=node_modules/eth-gas-reporter/",
    "hardhat/=node_modules/hardhat/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "london",
  "libraries": {}
}

[{"inputs":[{"internalType":"address","name":"_mestFactory","type":"address"},{"internalType":"address","name":"_weth","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"stateMutability":"payable","type":"fallback"},{"inputs":[],"name":"WETH","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"aWETH","outputs":[{"internalType":"contract IAToken","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"aaveGateway","outputs":[{"internalType":"contract IAaveGateway","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"aavePool","outputs":[{"internalType":"contract IAavePool","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mestFactory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newPool","type":"address"},{"internalType":"address","name":"newGateway","type":"address"}],"name":"setAaveInfo","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"yieldBalanceOf","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"yieldDeposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"yieldMaxWithdrawable","outputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"yieldToken","outputs":[{"internalType":"address","name":"yieldTokenAddr","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"yieldWithdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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000000000000000000000000599a58be6367e43e2bea28de14beaadd316d1de80000000000000000000000004200000000000000000000000000000000000006

-----Decoded View---------------
Arg [0] : _mestFactory (address): 0x599A58BE6367E43e2BEa28DE14BEAAdd316d1de8
Arg [1] : _weth (address): 0x4200000000000000000000000000000000000006

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000599a58be6367e43e2bea28de14beaadd316d1de8
Arg [1] : 0000000000000000000000004200000000000000000000000000000000000006