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// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.12;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import "../interfaces/ITreasury.sol";

struct MerkleTree {
    // Root of a Merkle tree which leaves are (address user, address token, uint amount)
    // representing an amount of tokens owed to user.
    // The Merkle tree is assumed to have only increasing amounts: that is to say if a user can claim 1,
    // then after the amount associated in the Merkle tree for this token should be x > 1
    bytes32 merkleRoot;
    // Ipfs hash of the tree data
    bytes32 ipfsHash;
}

/// @title MerkleRootDistributor
/// @notice Allows the DAO to distribute rewards through Merkle Roots
/// @author Angle Core Team
contract MerkleRootDistributorV2 is Initializable {
    using SafeERC20 for IERC20;

    /// @notice Tree of claimable tokens through this contract
    MerkleTree public tree;

    /// @notice Treasury contract handling access control
    ITreasury public treasury;

    /// @notice Mapping user -> token -> amount to track claimed amounts
    mapping(address => mapping(address => uint256)) public claimed;

    /// @notice Trusted EOAs to update the merkle root
    mapping(address => uint256) public trusted;

    /// @notice Whether or not to enable permissionless claiming
    mapping(address => uint256) public whitelist;

    /// @notice user -> operator -> authorisation to claim
    mapping(address => mapping(address => uint256)) public operators;

    uint256[44] private __gap;

    // ================================== Events ===================================

    event TrustedToggled(address indexed eoa, bool trust);
    event Recovered(address indexed token, address indexed to, uint256 amount);
    event TreeUpdated(bytes32 merkleRoot, bytes32 ipfsHash);
    event Claimed(address user, address token, uint256 amount);
    event WhitelistToggled(address user, bool isEnabled);
    event OperatorToggled(address user, address operator, bool isWhitelisted);

    // ================================== Errors ===================================

    error InvalidLengths();
    error InvalidProof();
    error NotGovernorOrGuardian();
    error NotTrusted();
    error ZeroAddress();
    error NotWhitelisted();

    // ================================= Modifiers =================================

    /// @notice Checks whether the `msg.sender` has the governor role or the guardian role
    modifier onlyGovernorOrGuardian() {
        if (!treasury.isGovernorOrGuardian(msg.sender)) revert NotGovernorOrGuardian();
        _;
    }

    /// @notice Checks whether the `msg.sender` is a trusted address to change the Merkle root of the contract
    modifier onlyTrusted() {
        if (!treasury.isGovernorOrGuardian(msg.sender) && trusted[msg.sender] != 1) revert NotTrusted();
        _;
    }

    // ============================ Constructor ====================================

    constructor() initializer {}

    function initialize(ITreasury _treasury) public initializer {
        if (address(_treasury) == address(0)) revert ZeroAddress();
        treasury = _treasury;
    }

    // =========================== Main Function ===================================

    /// @notice Claims rewards for a given set of users
    /// @dev Anyone may call this function for anyone else, funds go to destination regardless, it's just a question of
    /// who provides the proof and pays the gas: `msg.sender` is not used in this function
    /// @param users Recipient of tokens
    /// @param tokens ERC20 claimed
    /// @param amounts Amount of tokens that will be sent to the corresponding users
    /// @param proofs Array of hashes bridging from leaf (hash of user | token | amount) to Merkle root
    function claim(
        address[] calldata users,
        address[] calldata tokens,
        uint256[] calldata amounts,
        bytes32[][] calldata proofs
    ) public {
        if (
            users.length == 0 ||
            users.length != tokens.length ||
            users.length != amounts.length ||
            users.length != proofs.length
        ) revert InvalidLengths();

        for (uint256 i = 0; i < users.length; i++) {
            address user = users[i];
            address token = tokens[i];
            uint256 amount = amounts[i];

            // Check whitelist if needed
            if (whitelist[user] == 1 && operators[user][msg.sender] == 0) revert NotWhitelisted();

            // Verifying proof
            bytes32 leaf = keccak256(abi.encode(user, token, amount));
            if (!_verifyProof(leaf, proofs[i])) revert InvalidProof();

            // Closing reentrancy gate here
            uint256 toSend = amount - claimed[user][token];
            claimed[user][token] = amount;

            IERC20(token).safeTransfer(user, toSend);
            emit Claimed(user, token, toSend);
        }
    }

    // =========================== Governance Functions ============================

    /// @notice Pull reward amount from caller
    function deposit_reward_token(IERC20 token, uint256 amount) external {
        token.transferFrom(msg.sender, address(this), amount);
    }

    /// @notice Adds or removes trusted EOA
    function toggleTrusted(address eoa) external onlyGovernorOrGuardian {
        uint256 trustedStatus = 1 - trusted[eoa];
        trusted[eoa] = trustedStatus;
        emit TrustedToggled(eoa, trustedStatus == 1);
    }

    /// @notice Updates Merkle Tree
    function updateTree(MerkleTree calldata _tree) external onlyTrusted {
        tree = _tree;
        emit TreeUpdated(_tree.merkleRoot, _tree.ipfsHash);
    }

    /// @notice Toggles permissionless claiming for a given user
    function toggleWhitelist(address user) external {
        if (user != msg.sender && !treasury.isGovernorOrGuardian(msg.sender) && trusted[msg.sender] != 1)
            revert NotTrusted();
        whitelist[user] = 1 - whitelist[user];
        emit WhitelistToggled(user, whitelist[user] == 1);
    }

    /// @notice Toggles whitelisting for a given user and a given operator
    function toggleOperator(address user, address operator) external {
        if (user != msg.sender && !treasury.isGovernorOrGuardian(msg.sender) && trusted[msg.sender] != 1)
            revert NotTrusted();
        operators[user][operator] = 1 - operators[user][operator];
        emit OperatorToggled(user, operator, operators[user][operator] == 1);
    }

    /// @notice Recovers any ERC20 token
    function recoverERC20(
        address tokenAddress,
        address to,
        uint256 amountToRecover
    ) external onlyGovernorOrGuardian {
        IERC20(tokenAddress).safeTransfer(to, amountToRecover);
        emit Recovered(tokenAddress, to, amountToRecover);
    }

    // =========================== Internal Functions ==============================

    /// @notice Checks the validity of a proof
    /// @param leaf Hashed leaf data, the starting point of the proof
    /// @param proof Array of hashes forming a hash chain from leaf to root
    /// @return true If proof is correct, else false
    function _verifyProof(bytes32 leaf, bytes32[] memory proof) internal view returns (bool) {
        bytes32 currentHash = leaf;
        for (uint256 i = 0; i < proof.length; i += 1) {
            if (currentHash < proof[i]) {
                currentHash = keccak256(abi.encode(currentHash, proof[i]));
            } else {
                currentHash = keccak256(abi.encode(proof[i], currentHash));
            }
        }
        return currentHash == tree.merkleRoot;
    }
}

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

pragma solidity ^0.8.0;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the
 * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() initializer {}
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        // If the contract is initializing we ignore whether _initialized is set in order to support multiple
        // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the
        // contract may have been reentered.
        require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} modifier, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}

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

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.12;

import "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";

/// @title IAgToken
/// @author Angle Core Team
/// @notice Interface for the stablecoins `AgToken` contracts
/// @dev This interface only contains functions of the `AgToken` contract which are called by other contracts
/// of this module or of the first module of the Angle Protocol
interface IAgToken is IERC20Upgradeable {
    // ======================= Minter Role Only Functions ===========================

    /// @notice Lets the `StableMaster` contract or another whitelisted contract mint agTokens
    /// @param account Address to mint to
    /// @param amount Amount to mint
    /// @dev The contracts allowed to issue agTokens are the `StableMaster` contract, `VaultManager` contracts
    /// associated to this stablecoin as well as the flash loan module (if activated) and potentially contracts
    /// whitelisted by governance
    function mint(address account, uint256 amount) external;

    /// @notice Burns `amount` tokens from a `burner` address after being asked to by `sender`
    /// @param amount Amount of tokens to burn
    /// @param burner Address to burn from
    /// @param sender Address which requested the burn from `burner`
    /// @dev This method is to be called by a contract with the minter right after being requested
    /// to do so by a `sender` address willing to burn tokens from another `burner` address
    /// @dev The method checks the allowance between the `sender` and the `burner`
    function burnFrom(
        uint256 amount,
        address burner,
        address sender
    ) external;

    /// @notice Burns `amount` tokens from a `burner` address
    /// @param amount Amount of tokens to burn
    /// @param burner Address to burn from
    /// @dev This method is to be called by a contract with a minter right on the AgToken after being
    /// requested to do so by an address willing to burn tokens from its address
    function burnSelf(uint256 amount, address burner) external;

    // ========================= Treasury Only Functions ===========================

    /// @notice Adds a minter in the contract
    /// @param minter Minter address to add
    /// @dev Zero address checks are performed directly in the `Treasury` contract
    function addMinter(address minter) external;

    /// @notice Removes a minter from the contract
    /// @param minter Minter address to remove
    /// @dev This function can also be called by a minter wishing to revoke itself
    function removeMinter(address minter) external;

    /// @notice Sets a new treasury contract
    /// @param _treasury New treasury address
    function setTreasury(address _treasury) external;

    // ========================= External functions ================================

    /// @notice Checks whether an address has the right to mint agTokens
    /// @param minter Address for which the minting right should be checked
    /// @return Whether the address has the right to mint agTokens or not
    function isMinter(address minter) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.12;

/// @title ICoreBorrow
/// @author Angle Core Team
/// @notice Interface for the `CoreBorrow` contract
/// @dev This interface only contains functions of the `CoreBorrow` contract which are called by other contracts
/// of this module
interface ICoreBorrow {
    /// @notice Checks if an address corresponds to a treasury of a stablecoin with a flash loan
    /// module initialized on it
    /// @param treasury Address to check
    /// @return Whether the address has the `FLASHLOANER_TREASURY_ROLE` or not
    function isFlashLoanerTreasury(address treasury) external view returns (bool);

    /// @notice Checks whether an address is governor of the Angle Protocol or not
    /// @param admin Address to check
    /// @return Whether the address has the `GOVERNOR_ROLE` or not
    function isGovernor(address admin) external view returns (bool);

    /// @notice Checks whether an address is governor or a guardian of the Angle Protocol or not
    /// @param admin Address to check
    /// @return Whether the address has the `GUARDIAN_ROLE` or not
    /// @dev Governance should make sure when adding a governor to also give this governor the guardian
    /// role by calling the `addGovernor` function
    function isGovernorOrGuardian(address admin) external view returns (bool);
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.12;

import "./IAgToken.sol";
import "./ICoreBorrow.sol";

/// @title IFlashAngle
/// @author Angle Core Team
/// @notice Interface for the `FlashAngle` contract
/// @dev This interface only contains functions of the contract which are called by other contracts
/// of this module
interface IFlashAngle {
    /// @notice Reference to the `CoreBorrow` contract managing the FlashLoan module
    function core() external view returns (ICoreBorrow);

    /// @notice Sends the fees taken from flash loans to the treasury contract associated to the stablecoin
    /// @param stablecoin Stablecoin from which profits should be sent
    /// @return balance Amount of profits sent
    /// @dev This function can only be called by the treasury contract
    function accrueInterestToTreasury(IAgToken stablecoin) external returns (uint256 balance);

    /// @notice Adds support for a stablecoin
    /// @param _treasury Treasury associated to the stablecoin to add support for
    /// @dev This function can only be called by the `CoreBorrow` contract
    function addStablecoinSupport(address _treasury) external;

    /// @notice Removes support for a stablecoin
    /// @param _treasury Treasury associated to the stablecoin to remove support for
    /// @dev This function can only be called by the `CoreBorrow` contract
    function removeStablecoinSupport(address _treasury) external;

    /// @notice Sets a new core contract
    /// @param _core Core contract address to set
    /// @dev This function can only be called by the `CoreBorrow` contract
    function setCore(address _core) external;
}

// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.12;

import "./IAgToken.sol";
import "./ICoreBorrow.sol";
import "./IFlashAngle.sol";

/// @title ITreasury
/// @author Angle Core Team
/// @notice Interface for the `Treasury` contract
/// @dev This interface only contains functions of the `Treasury` which are called by other contracts
/// of this module
interface ITreasury {
    /// @notice Stablecoin handled by this `treasury` contract
    function stablecoin() external view returns (IAgToken);

    /// @notice Checks whether a given address has the  governor role
    /// @param admin Address to check
    /// @return Whether the address has the governor role
    /// @dev Access control is only kept in the `CoreBorrow` contract
    function isGovernor(address admin) external view returns (bool);

    /// @notice Checks whether a given address has the guardian or the governor role
    /// @param admin Address to check
    /// @return Whether the address has the guardian or the governor role
    /// @dev Access control is only kept in the `CoreBorrow` contract which means that this function
    /// queries the `CoreBorrow` contract
    function isGovernorOrGuardian(address admin) external view returns (bool);

    /// @notice Checks whether a given address has well been initialized in this contract
    /// as a `VaultManager``
    /// @param _vaultManager Address to check
    /// @return Whether the address has been initialized or not
    function isVaultManager(address _vaultManager) external view returns (bool);

    /// @notice Sets a new flash loan module for this stablecoin
    /// @param _flashLoanModule Reference to the new flash loan module
    /// @dev This function removes the minting right to the old flash loan module and grants
    /// it to the new module
    function setFlashLoanModule(address _flashLoanModule) external;
}

{
  "evmVersion": "london",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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ITreasury","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tree","outputs":[{"internalType":"bytes32","name":"merkleRoot","type":"bytes32"},{"internalType":"bytes32","name":"ipfsHash","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"trusted","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"merkleRoot","type":"bytes32"},{"internalType":"bytes32","name":"ipfsHash","type":"bytes32"}],"internalType":"struct MerkleTree","name":"_tree","type":"tuple"}],"name":"updateTree","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"whitelist","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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