// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// 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);
}

// File: @openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol



// 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");
        }
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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);
            }
        }
    }
}

// File: contracts/interfaces/IFraxStrategy.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.7;

/// @notice Frax Staking Handler Interface.
interface IFraxStrategy {
    function proxyCall(address _to, bytes memory _data) external;
}

// File: contracts/interfaces/ILocker.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.7;

interface ILocker {
	function createLock(uint256, uint256) external;

	function claimAllRewards(address[] calldata _tokens, address _recipient) external;

	function increaseAmount(uint256) external;

	function increaseUnlockTime(uint256) external;

	function release() external;

	function claimRewards(address, address) external;

	function claimFXSRewards(address) external;

	function execute(
		address,
		uint256,
		bytes calldata
	) external returns (bool, bytes memory);

	function setGovernance(address) external;

	function voteGaugeWeight(address, uint256) external;

	function setAngleDepositor(address) external;

	function setFxsDepositor(address) external;

	function setYieldDistributor(address) external;

	function setGaugeController(address) external;

	function setAccumulator(address _accumulator) external;

}

// File: contracts/interfaces/IPoolRegistry.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

interface IPoolRegistry {
	function poolLength() external view returns (uint256);

	function poolInfo(uint256 _pid)
		external
		view
		returns (
			address,
			address,
			address,
			address,
			uint8
		);

	function vaultMap(uint256 _pid, address _user) external view returns (address vault);
	
	function vaultPid(address _vault) external view returns(uint256 pid);

	function addUserVault(uint256 _pid, address _user)
		external
		returns (
			address vault,
			address stakeAddress,
			address stakeToken,
			address rewards
		);

	function deactivatePool(uint256 _pid) external;

	function createNewPoolRewards(uint256 _pid) external;

	function addPool(
		address _implementation,
		address _stakingAddress,
		address _stakingToken
	) external;

	function setRewardImplementation(address _imp) external;

	function setDistributor(address _distributor) external;

	function setOperator(address _op) external;
}

// File: contracts/interfaces/IProxyVault.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

interface IProxyVault {
	enum VaultType {
		Erc20Baic,
		Other1,
		Other2
	}

	function initialize(
		address _owner,
		address _stakingAddress,
		address _stakingToken,
		address _rewardsAddress
	) external;

	function usingProxy() external returns (address);

	function rewards() external returns (address);

	function getReward() external;

	function getReward(bool _claim) external;

	function getReward(bool _claim, address[] calldata _rewardTokenList) external;

	function earned() external view returns (address[] memory token_addresses, uint256[] memory total_earned);
}

// File: contracts/staking/Booster.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

import "../interfaces/ILocker.sol";
import "../interfaces/IProxyVault.sol";
import "../interfaces/IFraxStrategy.sol";
import "../interfaces/IPoolRegistry.sol";

contract Booster {
	using SafeERC20 for IERC20;

	address public constant FXS = address(0x3432B6A60D23Ca0dFCa7761B7ab56459D9C964D0);

	address public strategy;

	address public immutable proxy;
	address public immutable poolRegistry;

	address public owner;
	address public pendingOwner;
	address public poolManager;

	constructor(address _proxy, address _poolReg, address _strategy) {
		proxy = _proxy;
		strategy = _strategy;
		poolRegistry = _poolReg;
		owner = msg.sender;
		poolManager = msg.sender;
	}

	modifier onlyOwner() {
		require(owner == msg.sender, "!auth");
		_;
	}

	modifier onlyPoolManager() {
		require(poolManager == msg.sender, "!auth");
		_;
	}

	// ########################### Public function ######################### //
	// #=#=#=#=#=#=#=#=#=#=# Personal Vault Section  #=#=#=#=#=#=#=#=#=#=#=# //

	/// @notice create a vault for a user
	/// @param _pid pool id 
	function createVault(uint256 _pid) external {
		//create minimal proxy vault for specified pool
		(address vault, address stakeAddress, address stakeToken, address rewards) = IPoolRegistry(poolRegistry)
			.addUserVault(_pid, msg.sender);
		//make voterProxy call proxyToggleStaker(vault) on the pool's stakingAddress to set it as a proxied child
		bytes memory data = abi.encodeWithSelector(bytes4(keccak256("proxyToggleStaker(address)")), vault);
		IFraxStrategy(strategy).proxyCall(stakeAddress, data);

		//call proxy initialize
		IProxyVault(vault).initialize(msg.sender, stakeAddress, stakeToken, rewards);

		//set vault veFXS proxy
		data = abi.encodeWithSelector(bytes4(keccak256("setVeFXSProxy(address)")), proxy);
		IFraxStrategy(strategy).proxyCall(vault, data);
	}

	// #=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=# //

	// ######################## Restricted function ######################## //
	// #=#=#=#=#=#=#=#=#=#  Booster Management Section #=#=#=#=#=#=#=#=#=#=# //

	/// @notice set pending owner
	/// @param _po pending owner address
	function setPendingOwner(address _po) external onlyOwner {
		pendingOwner = _po;
		emit SetPendingOwner(_po);
	}

	/// @notice claim ownership
	function acceptPendingOwner() external {
		require(pendingOwner != address(0) && msg.sender == pendingOwner, "!p_owner");

		owner = pendingOwner;
		pendingOwner = address(0);
		emit OwnerChanged(owner);
	}

	/// @notice set pool manager
	/// @param _pmanager new pool manager address
	function setPoolManager(address _pmanager) external onlyOwner {
		poolManager = _pmanager;
		emit PoolManagerChanged(_pmanager);
	}

	/// @notice recover tokens on this contract
	/// @param _tokenAddress token address to rescue
	/// @param _tokenAmount amount of token to rescue
	/// @param _withdrawTo address to transfer rescued token
	function recoverERC20(
		address _tokenAddress,
		uint256 _tokenAmount,
		address _withdrawTo
	) external onlyOwner {
		IERC20(_tokenAddress).safeTransfer(_withdrawTo, _tokenAmount);
		emit Recovered(_tokenAddress, _tokenAmount);
	}

	// #=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=# //

	// #=#=#=#=#=#=#=# Start Pool Registry Management Section #=#=#=#=#=#=#=# //

	/* ---- Setter ---- */
	/// @notice set new operator on pool registry
	/// @param _op new operator address
	function setOperator(address _op) external onlyPoolManager {
		IPoolRegistry(poolRegistry).setOperator(_op);
	}

	/// @notice set new distributor on pool registry
	/// @param _distributor new distributor address
	function setDistributor(address _distributor) external onlyPoolManager {
		IPoolRegistry(poolRegistry).setDistributor(_distributor);
	}

	/// @notice set a new reward pool implementation for future pools on pool registry 
	/// @param _impl new reward pool address
	function setPoolRewardImplementation(address _impl) external onlyPoolManager {
		IPoolRegistry(poolRegistry).setRewardImplementation(_impl);
	}

	/* ---- Pool management ---- */
	/// @notice add a new pool and implementation on pool registry
	/// @param _implementation personal vault contract model address
	/// @param _stakingAddress Frax gauge stacking LP token address
	/// @param _stakingToken LP token address for Frax gauge
	function addPool(
		address _implementation,
		address _stakingAddress,
		address _stakingToken
	) external onlyPoolManager {
		IPoolRegistry(poolRegistry).addPool(_implementation, _stakingAddress, _stakingToken);
	}

	/// @notice update rewards contract on a specific pool, when updated with setRewardImplementation().
	/// @dev each user must call changeRewards on vault to update to new contract
	/// @param _pid pool id for the new rewards contract
	function createNewPoolRewards(uint256 _pid) external onlyPoolManager {
		IPoolRegistry(poolRegistry).createNewPoolRewards(_pid);
	}

	/// @notice deactivates pool so that new vaults can not be made on pool registry.
	/// @dev can not force shutdown/withdraw user funds
	/// @param _pid pool id to desactivate
	function deactivatePool(uint256 _pid) external onlyPoolManager {
		IPoolRegistry(poolRegistry).deactivatePool(_pid);
	}

	/// @notice Set strategy to interact with Locker.
	/// @param _strategy new strategy
	function setStrategy(address _strategy) external onlyPoolManager {
		strategy = _strategy;
	}

	// #=#=#=#=#=#=#=#=#=#=#=#=#=#=#    EVENTS   #=#=#=#=#=#=#=#=#=#=#=#=#=# //
	event SetPendingOwner(address indexed _address);
	event OwnerChanged(address indexed _address);
	event PoolManagerChanged(address indexed _address);
	event Recovered(address indexed _token, uint256 _amount);
}