// File: contracts/LMTerminal.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;

import "@openzeppelin/contracts-upgradeable/proxy/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";

import "@uniswap/v3-periphery/contracts/interfaces/INonfungiblePositionManager.sol";
import "@uniswap/v3-core/contracts/interfaces/IUniswapV3Factory.sol";

import "./interfaces/IERC20Extended.sol";
import "./interfaces/ICLR.sol";
import "./interfaces/IStakedCLRToken.sol";
import "./interfaces/IRewardEscrow.sol";
import "./interfaces/IxTokenManager.sol";
import "./interfaces/IProxyAdmin.sol";

import "./CLRDeployer.sol";

/**
 * Liquidity Mining Terminal
 * Core Management contract for LM Programs
 */
contract LMTerminal is Initializable, OwnableUpgradeable {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    // -- State Variables --

    IRewardEscrow public rewardEscrow; // Contract for token vesting after deployment
    ICLR[] public deployedCLRPools;

    uint256 public deploymentFee; // Flat CLR pool deployment fee in ETH
    uint256 public rewardFee; // Fee applied on initiating rewards program as a fee divisor (100 = 1%)
    uint256 public tradeFee; // Fee applied when collecting CLR fees as a fee divisor (100 = 1%)

    mapping(address => uint256) public customDeploymentFee; // Premium deployment fees for select partners
    mapping(address => bool) public customDeploymentFeeEnabled; // True if premium fee is enabled

    CLRDeployer public clrDeployer; // Deployer contract for CLR pools and Staked CLR Tokens
    IxTokenManager public xTokenManager; // xTokenManager contract
    address public proxyAdmin; // Proxy Admin of CLR instances

    IUniswapV3Factory public uniswapFactory; // Uniswap V3 Factory Contract
    INonfungiblePositionManager public positionManager; // Uniswap V3 Position Manager contract
    ICLR.UniswapContracts public uniContracts; // Uniswap V3 Contracts

    mapping(address => bool) private isCLRPool; // True if address is CLR pool

    // -- Structs --

    struct PositionTicks {
        int24 lowerTick;
        int24 upperTick;
    }

    struct RewardsProgram {
        address[] rewardTokens;
        uint256 vestingPeriod;
    }

    struct PoolDetails {
        uint24 fee;
        address token0;
        address token1;
        uint256 amount0;
        uint256 amount1;
    }

    // -- Events --

    // Management
    event DeployedUniV3Pool(
        address indexed pool,
        address indexed token0,
        address indexed token1,
        uint24 fee
    );
    event DeployedIncentivizedPool(
        address indexed clrInstance,
        address indexed token0,
        address indexed token1,
        uint24 fee,
        int24 lowerTick,
        int24 upperTick
    );
    event InitiatedRewardsProgram(
        address indexed clrInstance,
        address[] rewardTokens,
        uint256[] totalRewardAmounts,
        uint256 rewardsDuration
    );
    event TokenFeeWithdraw(address indexed token, uint256 amount);
    event EthFeeWithdraw(uint256 amount);

    // --- Management functions ---

    function initialize(
        address _xTokenManager,
        address _rewardEscrow,
        address _proxyAdmin,
        address _clrDeployer,
        address _uniswapFactory,
        ICLR.UniswapContracts memory _uniContracts,
        uint256 _deploymentFee,
        uint256 _rewardFee,
        uint256 _tradeFee
    ) external initializer {
        __Ownable_init();
        xTokenManager = IxTokenManager(_xTokenManager);
        rewardEscrow = IRewardEscrow(_rewardEscrow);
        proxyAdmin = _proxyAdmin;
        clrDeployer = CLRDeployer(_clrDeployer);
        positionManager = INonfungiblePositionManager(
            _uniContracts.positionManager
        );
        uniswapFactory = IUniswapV3Factory(_uniswapFactory);
        uniContracts = _uniContracts;
        deploymentFee = _deploymentFee;
        rewardFee = _rewardFee;
        tradeFee = _tradeFee;
    }

    /**
     * @notice Deploys a uniswap pool in case there isn't one
     *
     * @param token0 address of token 0
     * @param token1 address of token 1
     * @param fee pool fee (500 = 0.05%, 3000 = 0.3%, 10000 = 1%)
     * @param initPrice initial pool price
     */
    function deployUniswapPool(
        address token0,
        address token1,
        uint24 fee,
        uint160 initPrice
    ) external returns (address pool) {
        if (token0 > token1) {
            (token0, token1) = (token1, token0);
        }
        pool = positionManager.createAndInitializePoolIfNecessary(
            token0,
            token1,
            fee,
            initPrice
        );
        emit DeployedUniV3Pool(pool, token0, token1, fee);
    }

    /**
     * @notice Deploys a Uni V3 pool which is incentivized by a given token
     * @notice LP Stakers will receive a portion of the totalRewardsAmount
     * @notice Address calling this function needs to approve token 0 and token 1 to Terminal
     *
     * @param symbol CLR Pool token symbol
     * @param ticks lower and upper ticks of the position
     * @param rewardsProgram Rewards program parameters
     * @param pool pool fee, token0, token1 and initial liquidity amounts
     */
    function deployIncentivizedPool(
        string memory symbol,
        PositionTicks memory ticks,
        RewardsProgram memory rewardsProgram,
        PoolDetails memory pool
    ) external payable {
        uint256 feeOwed = customDeploymentFeeEnabled[msg.sender]
            ? customDeploymentFee[msg.sender]
            : deploymentFee;
        require(
            msg.value == feeOwed,
            "Need to send ETH for CLR pool deployment"
        );
        // Deploy CLR
        ICLR clrPool = ICLR(clrDeployer.deployCLRPool(proxyAdmin));
        // Deploy Staked CLR Token
        IStakedCLRToken stakedToken = IStakedCLRToken(
            clrDeployer.deploySCLRToken(proxyAdmin)
        );
        // Initialize Staked CLR Token
        stakedToken.initialize(
            "StakedCLRToken",
            symbol,
            address(clrPool),
            false
        );

        // Initialize CLR
        if (pool.token0 > pool.token1) {
            address tmp = pool.token0;
            pool.token0 = pool.token1;
            pool.token1 = tmp;
        }
        bool rewardsAreEscrowed = rewardsProgram.vestingPeriod > 0
            ? true
            : false;
        address poolAddress = getPool(pool.token0, pool.token1, pool.fee);
        ICLR.StakingDetails memory stakingParams = ICLR.StakingDetails({
            rewardTokens: rewardsProgram.rewardTokens,
            rewardEscrow: address(rewardEscrow),
            rewardsAreEscrowed: rewardsAreEscrowed
        });

        // Initialize CLR
        clrPool.initialize(
            symbol,
            ticks.lowerTick,
            ticks.upperTick,
            pool.fee,
            tradeFee,
            pool.token0,
            pool.token1,
            address(stakedToken),
            address(this),
            poolAddress,
            uniContracts,
            stakingParams
        );

        // Approve tokens to clr pool
        IERC20(pool.token0).safeApprove(address(clrPool), pool.amount0);
        IERC20(pool.token1).safeApprove(address(clrPool), pool.amount1);

        // Transfer initial mint tokens to Terminal
        IERC20(pool.token0).safeTransferFrom(
            msg.sender,
            address(this),
            pool.amount0
        );
        IERC20(pool.token1).safeTransferFrom(
            msg.sender,
            address(this),
            pool.amount1
        );

        // Create Uniswap V3 Position, seed with initial liquidity
        clrPool.mintInitial(pool.amount0, pool.amount1, msg.sender);

        // Setup vesting period if rewards are escrowed
        if (rewardsAreEscrowed) {
            rewardEscrow.setCLRPoolVestingPeriod(
                address(clrPool),
                rewardsProgram.vestingPeriod
            );
        }

        // Transfer ownership of CLR to deployer
        clrPool.transferOwnership(msg.sender);

        // Set CLR and Staked Token proxy admin to deployer
        IProxyAdmin(proxyAdmin).addProxyAdmin(address(clrPool), msg.sender);
        IProxyAdmin(proxyAdmin).addProxyAdmin(address(stakedToken), msg.sender);

        deployedCLRPools.push(clrPool);
        isCLRPool[address(clrPool)] = true;
        emit DeployedIncentivizedPool(
            address(clrPool),
            pool.token0,
            pool.token1,
            pool.fee,
            ticks.lowerTick,
            ticks.upperTick
        );
    }

    /**
     * @notice Initiate reward accumulation for a given staking rewards contract
     * @notice Address calling this function needs to approve reward tokens to Terminal
     */
    function initiateRewardsProgram(
        ICLR clrPool,
        uint256[] memory totalRewardAmounts,
        uint256 rewardsDuration
    ) external {
        require(isCLRPool[address(clrPool)], "Not CLR pool");
        require(
            clrPool.periodFinish() == 0,
            "Reward program has been initiated"
        );
        if (clrPool.rewardsAreEscrowed()) {
            rewardEscrow.addRewardsContract(address(clrPool));
        }
        clrPool.setRewardsDuration(rewardsDuration);
        _initiateRewardsProgram(clrPool, totalRewardAmounts);
    }

    /**
     * @notice Initiate new reward accumulation for a given staking rewards contract
     * @notice Address calling this function needs to approve reward token to Terminal
     * @notice Used only after first rewards program has ended
     */
    function initiateNewRewardsProgram(
        ICLR clrPool,
        uint256[] memory totalRewardAmounts,
        uint256 rewardsDuration
    ) external {
        require(
            clrPool.periodFinish() != 0,
            "First program must be initialized using initiateRewardsProgram"
        );
        require(
            block.timestamp > clrPool.periodFinish(),
            "Previous program must finish before initializing a new one"
        );
        clrPool.setRewardsDuration(rewardsDuration);
        _initiateRewardsProgram(clrPool, totalRewardAmounts);
    }

    /**
     * Initiate rewards program for all reward tokens in pool
     * @notice reward amounts must be ordered based on the initial reward token order
     * @notice each reward token will be initialized with exactly the reward amount set here
     * @param clrPool pool to initiate rewards for
     * @param totalRewardAmounts array of reward amounts for each reward token
     */
    function _initiateRewardsProgram(
        ICLR clrPool,
        uint256[] memory totalRewardAmounts
    ) private {
        address[] memory rewardTokens = clrPool.getRewardTokens();
        require(
            totalRewardAmounts.length == rewardTokens.length,
            "Total reward amounts count should be the same as reward tokens count"
        );
        address owner = clrPool.owner();
        address manager = clrPool.manager();
        require(
            msg.sender == owner || msg.sender == manager,
            "Only owner or manager can initiate the rewards program"
        );
        for (uint256 i = 0; i < rewardTokens.length; ++i) {
            address rewardToken = rewardTokens[i];
            uint256 rewardAmountFee = totalRewardAmounts[i].div(rewardFee);
            uint256 rewardAmount = totalRewardAmounts[i];
            // Transfer *rewardAmountFee* of rewardToken to LM Terminal as fee
            IERC20(rewardToken).safeTransferFrom(
                msg.sender,
                address(this),
                rewardAmountFee
            );
            // Add fee to reward fees
            // Transfer *totalRewardsAmount* of rewardToken to StakingRewards address
            IERC20(rewardToken).safeTransferFrom(
                msg.sender,
                address(clrPool),
                rewardAmount
            );
            clrPool.initializeReward(rewardAmount, rewardToken);
        }
        emit InitiatedRewardsProgram(
            address(clrPool),
            rewardTokens,
            totalRewardAmounts,
            clrPool.rewardsDuration()
        );
    }

    // --- Miscellaneous ---

    /**
     * @notice Get pool address from token0, token1 addresses and fee amount
     */
    function getPool(
        address token0,
        address token1,
        uint24 fee
    ) public view returns (address pool) {
        return uniswapFactory.getPool(token0, token1, fee);
    }

    /**
     * @notice Enable custom CLR pool deployment fee for a given address
     * @param deployer address to enable fee for
     * @param feeAmount fee amount in eth
     */
    function enableCustomDeploymentFee(address deployer, uint256 feeAmount)
        public
        onlyOwner
    {
        require(
            feeAmount < deploymentFee,
            "Custom fee should be less than flat deployment fee"
        );
        customDeploymentFeeEnabled[deployer] = true;
        customDeploymentFee[deployer] = feeAmount;
    }

    /**
     * @notice Disable custom CLR pool deployment fee for a given address
     * @param deployer address to disable fee for
     */
    function disableCustomDeploymentFee(address deployer) public onlyOwner {
        customDeploymentFeeEnabled[deployer] = false;
    }

    /**
     * @dev Change CLR Deployer address
     */
    function setCLRDeployer(address newDeployer) public onlyOwner {
        clrDeployer = CLRDeployer(newDeployer);
    }

    /**
     * @notice Withdraw function for xToken fees for a token
     * @dev Withdraws both ETH and reward token fees
     */
    function withdrawFees(IERC20 token) external onlyRevenueController {
        // Withdraw reward token fees
        uint256 fees = token.balanceOf(address(this));
        if (fees > 0) {
            token.safeTransfer(msg.sender, fees);
            emit TokenFeeWithdraw(address(token), fees);
        }

        // Withdraw ETH fees
        // Revenue Controller accepts ETH
        if (address(this).balance > 0) {
            bool sent = transferETH(address(this).balance, msg.sender);
            if (sent) {
                emit EthFeeWithdraw(address(this).balance);
            }
        }
    }

    function transferETH(uint256 amount, address payable to)
        private
        returns (bool sent)
    {
        (sent, ) = to.call{value: amount}("");
    }

    receive() external payable {}

    // --- Modifiers ---

    // For xToken Fee Claim functions
    modifier onlyRevenueController() {
        require(
            xTokenManager.isRevenueController(msg.sender),
            "Callable only by Revenue Controller"
        );
        _;
    }
}

// File: @openzeppelin/contracts-upgradeable/proxy/Initializable.sol



// SPDX-License-Identifier: MIT

// solhint-disable-next-line compiler-version
pragma solidity >=0.4.24 <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 {UpgradeableProxy-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.
 */
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() {
        require(_initializing || _isConstructor() || !_initialized, "Initializable: contract is already initialized");

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

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    /// @dev Returns true if and only if the function is running in the constructor
    function _isConstructor() private view returns (bool) {
        return !AddressUpgradeable.isContract(address(this));
    }
}

// File: @openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal initializer {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
    uint256[49] private __gap;
}

// File: @openzeppelin/contracts/math/SafeMath.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "./IERC20.sol";
import "../../math/SafeMath.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 SafeMath for uint256;
    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'
        // solhint-disable-next-line max-line-length
        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).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _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
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: @uniswap/v3-periphery/contracts/interfaces/INonfungiblePositionManager.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.7.5;
pragma abicoder v2;

import '@openzeppelin/contracts/token/ERC721/IERC721Metadata.sol';
import '@openzeppelin/contracts/token/ERC721/IERC721Enumerable.sol';

import './IPoolInitializer.sol';
import './IERC721Permit.sol';
import './IPeripheryImmutableState.sol';
import '../libraries/PoolAddress.sol';

/// @title Non-fungible token for positions
/// @notice Wraps Uniswap V3 positions in a non-fungible token interface which allows for them to be transferred
/// and authorized.
interface INonfungiblePositionManager is
    IPoolInitializer,
    IPeripheryImmutableState,
    IERC721Metadata,
    IERC721Enumerable,
    IERC721Permit
{
    /// @notice Emitted when liquidity is increased for a position NFT
    /// @dev Also emitted when a token is minted
    /// @param tokenId The ID of the token for which liquidity was increased
    /// @param liquidity The amount by which liquidity for the NFT position was increased
    /// @param amount0 The amount of token0 that was paid for the increase in liquidity
    /// @param amount1 The amount of token1 that was paid for the increase in liquidity
    event IncreaseLiquidity(uint256 indexed tokenId, uint128 liquidity, uint256 amount0, uint256 amount1);
    /// @notice Emitted when liquidity is decreased for a position NFT
    /// @param tokenId The ID of the token for which liquidity was decreased
    /// @param liquidity The amount by which liquidity for the NFT position was decreased
    /// @param amount0 The amount of token0 that was accounted for the decrease in liquidity
    /// @param amount1 The amount of token1 that was accounted for the decrease in liquidity
    event DecreaseLiquidity(uint256 indexed tokenId, uint128 liquidity, uint256 amount0, uint256 amount1);
    /// @notice Emitted when tokens are collected for a position NFT
    /// @dev The amounts reported may not be exactly equivalent to the amounts transferred, due to rounding behavior
    /// @param tokenId The ID of the token for which underlying tokens were collected
    /// @param recipient The address of the account that received the collected tokens
    /// @param amount0 The amount of token0 owed to the position that was collected
    /// @param amount1 The amount of token1 owed to the position that was collected
    event Collect(uint256 indexed tokenId, address recipient, uint256 amount0, uint256 amount1);

    /// @notice Returns the position information associated with a given token ID.
    /// @dev Throws if the token ID is not valid.
    /// @param tokenId The ID of the token that represents the position
    /// @return nonce The nonce for permits
    /// @return operator The address that is approved for spending
    /// @return token0 The address of the token0 for a specific pool
    /// @return token1 The address of the token1 for a specific pool
    /// @return fee The fee associated with the pool
    /// @return tickLower The lower end of the tick range for the position
    /// @return tickUpper The higher end of the tick range for the position
    /// @return liquidity The liquidity of the position
    /// @return feeGrowthInside0LastX128 The fee growth of token0 as of the last action on the individual position
    /// @return feeGrowthInside1LastX128 The fee growth of token1 as of the last action on the individual position
    /// @return tokensOwed0 The uncollected amount of token0 owed to the position as of the last computation
    /// @return tokensOwed1 The uncollected amount of token1 owed to the position as of the last computation
    function positions(uint256 tokenId)
        external
        view
        returns (
            uint96 nonce,
            address operator,
            address token0,
            address token1,
            uint24 fee,
            int24 tickLower,
            int24 tickUpper,
            uint128 liquidity,
            uint256 feeGrowthInside0LastX128,
            uint256 feeGrowthInside1LastX128,
            uint128 tokensOwed0,
            uint128 tokensOwed1
        );

    struct MintParams {
        address token0;
        address token1;
        uint24 fee;
        int24 tickLower;
        int24 tickUpper;
        uint256 amount0Desired;
        uint256 amount1Desired;
        uint256 amount0Min;
        uint256 amount1Min;
        address recipient;
        uint256 deadline;
    }

    /// @notice Creates a new position wrapped in a NFT
    /// @dev Call this when the pool does exist and is initialized. Note that if the pool is created but not initialized
    /// a method does not exist, i.e. the pool is assumed to be initialized.
    /// @param params The params necessary to mint a position, encoded as `MintParams` in calldata
    /// @return tokenId The ID of the token that represents the minted position
    /// @return liquidity The amount of liquidity for this position
    /// @return amount0 The amount of token0
    /// @return amount1 The amount of token1
    function mint(MintParams calldata params)
        external
        payable
        returns (
            uint256 tokenId,
            uint128 liquidity,
            uint256 amount0,
            uint256 amount1
        );

    struct IncreaseLiquidityParams {
        uint256 tokenId;
        uint256 amount0Desired;
        uint256 amount1Desired;
        uint256 amount0Min;
        uint256 amount1Min;
        uint256 deadline;
    }

    /// @notice Increases the amount of liquidity in a position, with tokens paid by the `msg.sender`
    /// @param params tokenId The ID of the token for which liquidity is being increased,
    /// amount0Desired The desired amount of token0 to be spent,
    /// amount1Desired The desired amount of token1 to be spent,
    /// amount0Min The minimum amount of token0 to spend, which serves as a slippage check,
    /// amount1Min The minimum amount of token1 to spend, which serves as a slippage check,
    /// deadline The time by which the transaction must be included to effect the change
    /// @return liquidity The new liquidity amount as a result of the increase
    /// @return amount0 The amount of token0 to acheive resulting liquidity
    /// @return amount1 The amount of token1 to acheive resulting liquidity
    function increaseLiquidity(IncreaseLiquidityParams calldata params)
        external
        payable
        returns (
            uint128 liquidity,
            uint256 amount0,
            uint256 amount1
        );

    struct DecreaseLiquidityParams {
        uint256 tokenId;
        uint128 liquidity;
        uint256 amount0Min;
        uint256 amount1Min;
        uint256 deadline;
    }

    /// @notice Decreases the amount of liquidity in a position and accounts it to the position
    /// @param params tokenId The ID of the token for which liquidity is being decreased,
    /// amount The amount by which liquidity will be decreased,
    /// amount0Min The minimum amount of token0 that should be accounted for the burned liquidity,
    /// amount1Min The minimum amount of token1 that should be accounted for the burned liquidity,
    /// deadline The time by which the transaction must be included to effect the change
    /// @return amount0 The amount of token0 accounted to the position's tokens owed
    /// @return amount1 The amount of token1 accounted to the position's tokens owed
    function decreaseLiquidity(DecreaseLiquidityParams calldata params)
        external
        payable
        returns (uint256 amount0, uint256 amount1);

    struct CollectParams {
        uint256 tokenId;
        address recipient;
        uint128 amount0Max;
        uint128 amount1Max;
    }

    /// @notice Collects up to a maximum amount of fees owed to a specific position to the recipient
    /// @param params tokenId The ID of the NFT for which tokens are being collected,
    /// recipient The account that should receive the tokens,
    /// amount0Max The maximum amount of token0 to collect,
    /// amount1Max The maximum amount of token1 to collect
    /// @return amount0 The amount of fees collected in token0
    /// @return amount1 The amount of fees collected in token1
    function collect(CollectParams calldata params) external payable returns (uint256 amount0, uint256 amount1);

    /// @notice Burns a token ID, which deletes it from the NFT contract. The token must have 0 liquidity and all tokens
    /// must be collected first.
    /// @param tokenId The ID of the token that is being burned
    function burn(uint256 tokenId) external payable;
}

// File: @uniswap/v3-core/contracts/interfaces/IUniswapV3Factory.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

/// @title The interface for the Uniswap V3 Factory
/// @notice The Uniswap V3 Factory facilitates creation of Uniswap V3 pools and control over the protocol fees
interface IUniswapV3Factory {
    /// @notice Emitted when the owner of the factory is changed
    /// @param oldOwner The owner before the owner was changed
    /// @param newOwner The owner after the owner was changed
    event OwnerChanged(address indexed oldOwner, address indexed newOwner);

    /// @notice Emitted when a pool is created
    /// @param token0 The first token of the pool by address sort order
    /// @param token1 The second token of the pool by address sort order
    /// @param fee The fee collected upon every swap in the pool, denominated in hundredths of a bip
    /// @param tickSpacing The minimum number of ticks between initialized ticks
    /// @param pool The address of the created pool
    event PoolCreated(
        address indexed token0,
        address indexed token1,
        uint24 indexed fee,
        int24 tickSpacing,
        address pool
    );

    /// @notice Emitted when a new fee amount is enabled for pool creation via the factory
    /// @param fee The enabled fee, denominated in hundredths of a bip
    /// @param tickSpacing The minimum number of ticks between initialized ticks for pools created with the given fee
    event FeeAmountEnabled(uint24 indexed fee, int24 indexed tickSpacing);

    /// @notice Returns the current owner of the factory
    /// @dev Can be changed by the current owner via setOwner
    /// @return The address of the factory owner
    function owner() external view returns (address);

    /// @notice Returns the tick spacing for a given fee amount, if enabled, or 0 if not enabled
    /// @dev A fee amount can never be removed, so this value should be hard coded or cached in the calling context
    /// @param fee The enabled fee, denominated in hundredths of a bip. Returns 0 in case of unenabled fee
    /// @return The tick spacing
    function feeAmountTickSpacing(uint24 fee) external view returns (int24);

    /// @notice Returns the pool address for a given pair of tokens and a fee, or address 0 if it does not exist
    /// @dev tokenA and tokenB may be passed in either token0/token1 or token1/token0 order
    /// @param tokenA The contract address of either token0 or token1
    /// @param tokenB The contract address of the other token
    /// @param fee The fee collected upon every swap in the pool, denominated in hundredths of a bip
    /// @return pool The pool address
    function getPool(
        address tokenA,
        address tokenB,
        uint24 fee
    ) external view returns (address pool);

    /// @notice Creates a pool for the given two tokens and fee
    /// @param tokenA One of the two tokens in the desired pool
    /// @param tokenB The other of the two tokens in the desired pool
    /// @param fee The desired fee for the pool
    /// @dev tokenA and tokenB may be passed in either order: token0/token1 or token1/token0. tickSpacing is retrieved
    /// from the fee. The call will revert if the pool already exists, the fee is invalid, or the token arguments
    /// are invalid.
    /// @return pool The address of the newly created pool
    function createPool(
        address tokenA,
        address tokenB,
        uint24 fee
    ) external returns (address pool);

    /// @notice Updates the owner of the factory
    /// @dev Must be called by the current owner
    /// @param _owner The new owner of the factory
    function setOwner(address _owner) external;

    /// @notice Enables a fee amount with the given tickSpacing
    /// @dev Fee amounts may never be removed once enabled
    /// @param fee The fee amount to enable, denominated in hundredths of a bip (i.e. 1e-6)
    /// @param tickSpacing The spacing between ticks to be enforced for all pools created with the given fee amount
    function enableFeeAmount(uint24 fee, int24 tickSpacing) external;
}

// File: contracts/interfaces/IERC20Extended.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

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

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Extended is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// File: contracts/interfaces/ICLR.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;

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

/**
 * Interface for CLR for Solidity integration
 */
interface ICLR is IERC20, IStakingRewards {
    function addManager(address _manager) external;

    function adminStake(uint256 amount0, uint256 amount1) external;

    function adminSwap(uint256 amount, bool _0for1) external;

    function calculateAmountsMintedSingleToken(uint8 inputAsset, uint256 amount)
        external
        view
        returns (uint256 amount0Minted, uint256 amount1Minted);

    function calculateMintAmount(uint256 amount0, uint256 amount1)
        external
        view
        returns (uint256 mintAmount);

    function calculatePoolMintedAmounts(uint256 amount0, uint256 amount1)
        external
        view
        returns (uint256 amount0Minted, uint256 amount1Minted);

    function collect()
        external
        returns (uint256 collected0, uint256 collected1);

    function decimals() external view returns (uint8);

    function decreaseAllowance(address spender, uint256 subtractedValue)
        external
        returns (bool);

    function deposit(uint8 inputAsset, uint256 amount) external;

    function getAmountsForLiquidity(uint128 liquidity)
        external
        view
        returns (uint256 amount0, uint256 amount1);

    function getBufferToken0Balance() external view returns (uint256 amount0);

    function getBufferToken1Balance() external view returns (uint256 amount1);

    function getBufferTokenBalance()
        external
        view
        returns (uint256 amount0, uint256 amount1);

    function getLiquidityForAmounts(uint256 amount0, uint256 amount1)
        external
        view
        returns (uint128 liquidity);

    function getPositionLiquidity() external view returns (uint128 liquidity);

    function getStakedTokenBalance()
        external
        view
        returns (uint256 amount0, uint256 amount1);

    function getTicks() external view returns (int24 tick0, int24 tick1);

    function increaseAllowance(address spender, uint256 addedValue)
        external
        returns (bool);

    function initialize(
        string memory _symbol,
        int24 _tickLower,
        int24 _tickUpper,
        uint24 _poolFee,
        uint256 _tradeFee,
        address _token0,
        address _token1,
        address _stakedToken,
        address _terminal,
        address _uniswapPool,
        UniswapContracts memory contracts,
        // Staking parameters
        StakingDetails memory stakingParams
    ) external;

    function manager() external view returns (address);

    function mintInitial(
        uint256 amount0,
        uint256 amount1,
        address sender
    ) external;

    function name() external view returns (string memory);

    function owner() external view returns (address);

    function pauseContract() external returns (bool);

    function paused() external view returns (bool);

    function poolFee() external view returns (uint24);

    function reinvest() external;

    function renounceOwnership() external;

    function stakedToken() external view returns (address);

    function symbol() external view returns (string memory);

    function token0() external view returns (address);

    function token0DecimalMultiplier() external view returns (uint256);

    function token0Decimals() external view returns (uint8);

    function token1() external view returns (address);

    function token1DecimalMultiplier() external view returns (uint256);

    function token1Decimals() external view returns (uint8);

    function tokenId() external view returns (uint256);

    function tradeFee() external view returns (uint256);

    function transferOwnership(address newOwner) external;

    function uniContracts()
        external
        view
        returns (
            address router,
            address quoter,
            address positionManager
        );

    function uniswapPool() external view returns (address);

    function unpauseContract() external returns (bool);

    function withdraw(uint256 amount) external;

    function withdrawAndClaimReward(uint256 amount) external;

    struct UniswapContracts {
        address router;
        address quoter;
        address positionManager;
    }

    struct StakingDetails {
        address[] rewardTokens;
        address rewardEscrow;
        bool rewardsAreEscrowed;
    }
}

// File: contracts/interfaces/IStakedCLRToken.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;

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

interface IStakedCLRToken is IERC20 {
    /// @notice Mints SCLR tokens in exchange for LP's provided tokens to CLR instance
    /// @param _recipient (address) LP's address to send the SCLR tokens to
    /// @param _amount (uint256) SCLR tokens amount to be minted
    /// @return  (bool) indicates a successful operation
    function mint(address _recipient, uint256 _amount) external returns (bool);

    /// @notice Burns SCLR tokens as indicated
    /// @param _sender (address) LP's address account to burn SCLR tokens from
    /// @param _amount (uint256) SCLR token amount to be burned
    /// @return  (bool) indicates a successful operation
    function burnFrom(address _sender, uint256 _amount) external returns (bool);

    /// @notice Initializes SCLR token
    /// @param _name (string) SCLR token's name
    /// @param _symbol (string) SCLR token's symbol
    /// @param _clrPool (address) Address of the CLR pool the token belongs to
    /// @param _transferable (bool) Indicates if token is transferable
    function initialize(
        string memory _name,
        string memory _symbol,
        address _clrPool,
        bool _transferable
    ) external;
}

// File: contracts/interfaces/IRewardEscrow.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

interface IRewardEscrow {
    function MAX_VESTING_ENTRIES() external view returns (uint256);

    function addRewardsContract(address _rewardContract) external;

    function appendVestingEntry(
        address token,
        address account,
        address pool,
        uint256 quantity
    ) external;

    function balanceOf(address token, address account)
        external
        view
        returns (uint256);

    function checkAccountSchedule(
        address pool,
        address token,
        address account
    ) external view returns (uint256[] memory);

    function clrPoolVestingPeriod(address) external view returns (uint256);

    function getNextVestingEntry(
        address pool,
        address token,
        address account
    ) external view returns (uint256[2] memory);

    function getNextVestingIndex(
        address pool,
        address token,
        address account
    ) external view returns (uint256);

    function getNextVestingQuantity(
        address pool,
        address token,
        address account
    ) external view returns (uint256);

    function getNextVestingTime(
        address pool,
        address token,
        address account
    ) external view returns (uint256);

    function getVestingQuantity(
        address pool,
        address token,
        address account,
        uint256 index
    ) external view returns (uint256);

    function getVestingScheduleEntry(
        address pool,
        address token,
        address account,
        uint256 index
    ) external view returns (uint256[2] memory);

    function getVestingTime(
        address pool,
        address token,
        address account,
        uint256 index
    ) external view returns (uint256);

    function initialize() external;

    function isRewardContract(address) external view returns (bool);

    function numVestingEntries(
        address pool,
        address token,
        address account
    ) external view returns (uint256);

    function owner() external view returns (address);

    function removeRewardsContract(address _rewardContract) external;

    function renounceOwnership() external;

    function setCLRPoolVestingPeriod(address pool, uint256 vestingPeriod)
        external;

    function totalEscrowedAccountBalance(address, address)
        external
        view
        returns (uint256);

    function totalEscrowedBalance(address) external view returns (uint256);

    function totalSupply(address token) external view returns (uint256);

    function totalVestedAccountBalance(address, address)
        external
        view
        returns (uint256);

    function transferOwnership(address newOwner) external;

    function vest(address pool, address token) external;

    function vestAll(address pool, address[] memory tokens) external;

    function vestingSchedules(
        address,
        address,
        address,
        uint256,
        uint256
    ) external view returns (uint256);
}

// File: contracts/interfaces/IxTokenManager.sol



//SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

interface IxTokenManager {
    /**
     * @dev Add a manager to an xAsset fund
     */
    function addManager(address manager, address fund) external;

    /**
     * @dev Remove a manager from an xAsset fund
     */
    function removeManager(address manager, address fund) external;

    /**
     * @dev Check if an address is a manager for a fund
     */
    function isManager(address manager, address fund)
        external
        view
        returns (bool);

    /**
     * @dev Set revenue controller
     */
    function setRevenueController(address controller) external;

    /**
     * @dev Check if address is revenue controller
     */
    function isRevenueController(address caller) external view returns (bool);
}

// File: contracts/interfaces/IProxyAdmin.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

interface IProxyAdmin {
    function addProxyAdmin(address proxy, address admin) external;

    function changeProxyAdmin(address proxy, address newAdmin) external;

    function getProxyAdmin(address proxy) external view returns (address);

    function getProxyImplementation(address proxy)
        external
        view
        returns (address);

    function owner() external view returns (address);

    function renounceOwnership() external;

    function transferOwnership(address newOwner) external;

    function upgrade(address proxy, address implementation) external;
}

// File: contracts/CLRDeployer.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;

import "./proxies/CLRProxy.sol";
import "./proxies/StakedCLRTokenProxy.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

/**
 * Manages deployment of CLR and StakedCLRToken Proxies
 * Deploys CLR proxies pointing to CLR implementation
 * Deploys StakedCLRToken proxies pointing to StakedCLRToken implementation
 */
contract CLRDeployer is Ownable {
    address public clrImplementation;
    address public sCLRTokenImplementation;

    constructor(address _clrImplementation, address _sclrTokenImplementation) {
        clrImplementation = _clrImplementation;
        sCLRTokenImplementation = _sclrTokenImplementation;
        emit CLRImplementationSet(_clrImplementation);
        emit CLRTokenImplementationSet(_sclrTokenImplementation);
    }

    function deployCLRPool(address _proxyAdmin)
        external
        returns (address pool)
    {
        CLRProxy clrInstance = new CLRProxy(
            clrImplementation,
            _proxyAdmin,
            address(this)
        );
        return address(clrInstance);
    }

    function deploySCLRToken(address _proxyAdmin)
        external
        returns (address token)
    {
        StakedCLRTokenProxy clrTokenInstance = new StakedCLRTokenProxy(
            sCLRTokenImplementation,
            _proxyAdmin,
            address(this)
        );
        return address(clrTokenInstance);
    }

    function setCLRImplementation(address _clrImplementation)
        external
        onlyOwner
    {
        clrImplementation = _clrImplementation;
        emit CLRImplementationSet(_clrImplementation);
    }

    function setsCLRTokenImplementation(address _sCLRTokenImplementation)
        external
        onlyOwner
    {
        sCLRTokenImplementation = _sCLRTokenImplementation;
        emit CLRTokenImplementationSet(_sCLRTokenImplementation);
    }

    // Events

    event CLRImplementationSet(address indexed clrImplementation);

    event CLRTokenImplementationSet(address indexed sCLRTokenImplementation);
}

// File: @openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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;
        // solhint-disable-next-line no-inline-assembly
        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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;
import "../proxy/Initializable.sol";

/*
 * @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 GSN 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 ContextUpgradeable is Initializable {
    function __Context_init() internal initializer {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal initializer {
    }
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
    uint256[50] private __gap;
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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);
}

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



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @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;
        // solhint-disable-next-line no-inline-assembly
        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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Metadata.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "./IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {

    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Enumerable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "./IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {

    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// File: @uniswap/v3-periphery/contracts/interfaces/IPoolInitializer.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.7.5;
pragma abicoder v2;

/// @title Creates and initializes V3 Pools
/// @notice Provides a method for creating and initializing a pool, if necessary, for bundling with other methods that
/// require the pool to exist.
interface IPoolInitializer {
    /// @notice Creates a new pool if it does not exist, then initializes if not initialized
    /// @dev This method can be bundled with others via IMulticall for the first action (e.g. mint) performed against a pool
    /// @param token0 The contract address of token0 of the pool
    /// @param token1 The contract address of token1 of the pool
    /// @param fee The fee amount of the v3 pool for the specified token pair
    /// @param sqrtPriceX96 The initial square root price of the pool as a Q64.96 value
    /// @return pool Returns the pool address based on the pair of tokens and fee, will return the newly created pool address if necessary
    function createAndInitializePoolIfNecessary(
        address token0,
        address token1,
        uint24 fee,
        uint160 sqrtPriceX96
    ) external payable returns (address pool);
}

// File: @uniswap/v3-periphery/contracts/interfaces/IERC721Permit.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.7.5;

import '@openzeppelin/contracts/token/ERC721/IERC721.sol';

/// @title ERC721 with permit
/// @notice Extension to ERC721 that includes a permit function for signature based approvals
interface IERC721Permit is IERC721 {
    /// @notice The permit typehash used in the permit signature
    /// @return The typehash for the permit
    function PERMIT_TYPEHASH() external pure returns (bytes32);

    /// @notice The domain separator used in the permit signature
    /// @return The domain seperator used in encoding of permit signature
    function DOMAIN_SEPARATOR() external view returns (bytes32);

    /// @notice Approve of a specific token ID for spending by spender via signature
    /// @param spender The account that is being approved
    /// @param tokenId The ID of the token that is being approved for spending
    /// @param deadline The deadline timestamp by which the call must be mined for the approve to work
    /// @param v Must produce valid secp256k1 signature from the holder along with `r` and `s`
    /// @param r Must produce valid secp256k1 signature from the holder along with `v` and `s`
    /// @param s Must produce valid secp256k1 signature from the holder along with `r` and `v`
    function permit(
        address spender,
        uint256 tokenId,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external payable;
}

// File: @uniswap/v3-periphery/contracts/interfaces/IPeripheryImmutableState.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

/// @title Immutable state
/// @notice Functions that return immutable state of the router
interface IPeripheryImmutableState {
    /// @return Returns the address of the Uniswap V3 factory
    function factory() external view returns (address);

    /// @return Returns the address of WETH9
    function WETH9() external view returns (address);
}

// File: @uniswap/v3-periphery/contracts/libraries/PoolAddress.sol



// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity >=0.5.0;

/// @title Provides functions for deriving a pool address from the factory, tokens, and the fee
library PoolAddress {
    bytes32 internal constant POOL_INIT_CODE_HASH = 0xc02f72e8ae5e68802e6d893d58ddfb0df89a2f4c9c2f04927db1186a29373660;

    /// @notice The identifying key of the pool
    struct PoolKey {
        address token0;
        address token1;
        uint24 fee;
    }

    /// @notice Returns PoolKey: the ordered tokens with the matched fee levels
    /// @param tokenA The first token of a pool, unsorted
    /// @param tokenB The second token of a pool, unsorted
    /// @param fee The fee level of the pool
    /// @return Poolkey The pool details with ordered token0 and token1 assignments
    function getPoolKey(
        address tokenA,
        address tokenB,
        uint24 fee
    ) internal pure returns (PoolKey memory) {
        if (tokenA > tokenB) (tokenA, tokenB) = (tokenB, tokenA);
        return PoolKey({token0: tokenA, token1: tokenB, fee: fee});
    }

    /// @notice Deterministically computes the pool address given the factory and PoolKey
    /// @param factory The Uniswap V3 factory contract address
    /// @param key The PoolKey
    /// @return pool The contract address of the V3 pool
    function computeAddress(address factory, PoolKey memory key) internal pure returns (address pool) {
        require(key.token0 < key.token1);
        pool = address(
            uint256(
                keccak256(
                    abi.encodePacked(
                        hex'ff',
                        factory,
                        keccak256(abi.encode(key.token0, key.token1, key.fee)),
                        POOL_INIT_CODE_HASH
                    )
                )
            )
        );
    }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "../../introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
      * @dev Safely transfers `tokenId` token from `from` to `to`.
      *
      * Requirements:
      *
      * - `from` cannot be the zero address.
      * - `to` cannot be the zero address.
      * - `tokenId` token must exist and be owned by `from`.
      * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
      * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
      *
      * Emits a {Transfer} event.
      */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
}

// File: @openzeppelin/contracts/introspection/IERC165.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: contracts/interfaces/IStakingRewards.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

import "./IRewardEscrow.sol";

interface IStakingRewards {
    // Views
    function earned(address account, address token)
        external
        view
        returns (uint256);

    function getRewardForDuration(address token)
        external
        view
        returns (uint256);

    function getRewardTokens() external view returns (address[] memory tokens);

    function getRewardTokensCount() external view returns (uint256);

    function lastTimeRewardApplicable() external view returns (uint256);

    function lastUpdateTime(address) external view returns (uint256);

    function periodFinish() external view returns (uint256);

    function rewardEscrow() external view returns (IRewardEscrow);

    function rewardInfo(address)
        external
        view
        returns (
            uint256 rewardRate,
            uint256 rewardPerTokenStored,
            uint256 totalRewardAmount,
            uint256 remainingRewardAmount
        );

    function rewardPerToken(address token) external view returns (uint256);

    function rewardTokens(uint256) external view returns (address);

    function rewardsAreEscrowed() external view returns (bool);

    function rewardsDuration() external view returns (uint256);

    function stakedBalanceOf(address account) external view returns (uint256);

    function stakedTotalSupply() external view returns (uint256);

    // Mutative
    function claimReward() external;

    function initializeReward(uint256 rewardAmount, address token) external;

    function setRewardsDuration(uint256 _rewardsDuration) external;
}

// File: contracts/proxies/CLRProxy.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;

import "@openzeppelin/contracts/proxy/TransparentUpgradeableProxy.sol";

import "../interfaces/ICLRDeployer.sol";

contract CLRProxy is TransparentUpgradeableProxy {
    /**
     * @dev Storage slot with the clrDeployer contract address.
     * This is the keccak-256 hash of "eip1967.proxy.clrDeployer" subtracted by 1,
     * and is validated in the constructor.
     */
    bytes32 private constant _DEPLOYER_SLOT =
        0x3d08d612cd86aed0e9677508733085e4cbe15d53bdc770ec5b581bb4e0a721ca;

    constructor(
        address _logic,
        address _proxyAdmin,
        address __clrDeployer
    ) TransparentUpgradeableProxy(_logic, _proxyAdmin, "") {
        assert(
            _DEPLOYER_SLOT ==
                bytes32(uint256(keccak256("eip1967.proxy.clrDeployer")) - 1)
        );
        _setCLRDeployer(__clrDeployer);
    }

    /**
     * @dev Returns the address of the clr deployer.
     */
    function _clrDeployer()
        internal
        view
        virtual
        returns (address clrDeployer)
    {
        bytes32 slot = _DEPLOYER_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            clrDeployer := sload(slot)
        }
    }

    /**
     * @dev Stores a new address in the clr deployer slot.
     */
    function _setCLRDeployer(address clrDeployer) private {
        bytes32 slot = _DEPLOYER_SLOT;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, clrDeployer)
        }
    }

    function upgradeTo(address _implementation) external override ifAdmin {
        require(
            ICLRDeployer(_clrDeployer()).clrImplementation() == _implementation,
            "Can only upgrade to latest CLR implementation"
        );
        _upgradeTo(_implementation);
    }

    function upgradeToAndCall(address _implementation, bytes calldata data)
        external
        payable
        override
        ifAdmin
    {
        require(
            ICLRDeployer(_clrDeployer()).clrImplementation() == _implementation,
            "Can only upgrade to latest CLR implementation"
        );
        _upgradeTo(_implementation);
        Address.functionDelegateCall(_implementation, data);
    }
}

// File: contracts/proxies/StakedCLRTokenProxy.sol



// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;

import "@openzeppelin/contracts/proxy/TransparentUpgradeableProxy.sol";

import "../interfaces/ICLRDeployer.sol";

contract StakedCLRTokenProxy is TransparentUpgradeableProxy {
    /**
     * @dev Storage slot with the clrDeployer contract address.
     * This is the keccak-256 hash of "eip1967.proxy.clrDeployer" subtracted by 1,
     * and is validated in the constructor.
     */
    bytes32 private constant _DEPLOYER_SLOT =
        0x3d08d612cd86aed0e9677508733085e4cbe15d53bdc770ec5b581bb4e0a721ca;

    constructor(
        address _logic,
        address _proxyAdmin,
        address __clrDeployer
    ) TransparentUpgradeableProxy(_logic, _proxyAdmin, "") {
        assert(
            _DEPLOYER_SLOT ==
                bytes32(uint256(keccak256("eip1967.proxy.clrDeployer")) - 1)
        );
        _setCLRDeployer(__clrDeployer);
    }

    /**
     * @dev Returns the address of the clr deployer.
     */
    function _clrDeployer()
        internal
        view
        virtual
        returns (address clrDeployer)
    {
        bytes32 slot = _DEPLOYER_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            clrDeployer := sload(slot)
        }
    }

    /**
     * @dev Stores a new address in the clr deployer slot.
     */
    function _setCLRDeployer(address clrDeployer) private {
        bytes32 slot = _DEPLOYER_SLOT;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, clrDeployer)
        }
    }

    function upgradeTo(address _implementation) external override ifAdmin {
        require(
            ICLRDeployer(_clrDeployer()).sCLRTokenImplementation() ==
                _implementation,
            "Can only upgrade to latest Staked CLR token implementation"
        );
        _upgradeTo(_implementation);
    }

    function upgradeToAndCall(address _implementation, bytes calldata data)
        external
        payable
        override
        ifAdmin
    {
        require(
            ICLRDeployer(_clrDeployer()).sCLRTokenImplementation() ==
                _implementation,
            "Can only upgrade to latest Staked CLR token implementation"
        );
        _upgradeTo(_implementation);
        Address.functionDelegateCall(_implementation, data);
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

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 () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: @openzeppelin/contracts/proxy/TransparentUpgradeableProxy.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "./UpgradeableProxy.sol";

/**
 * @dev This contract implements a proxy that is upgradeable by an admin.
 *
 * To avoid https://medium.com/nomic-labs-blog/malicious-backdoors-in-ethereum-proxies-62629adf3357[proxy selector
 * clashing], which can potentially be used in an attack, this contract uses the
 * https://blog.openzeppelin.com/the-transparent-proxy-pattern/[transparent proxy pattern]. This pattern implies two
 * things that go hand in hand:
 *
 * 1. If any account other than the admin calls the proxy, the call will be forwarded to the implementation, even if
 * that call matches one of the admin functions exposed by the proxy itself.
 * 2. If the admin calls the proxy, it can access the admin functions, but its calls will never be forwarded to the
 * implementation. If the admin tries to call a function on the implementation it will fail with an error that says
 * "admin cannot fallback to proxy target".
 *
 * These properties mean that the admin account can only be used for admin actions like upgrading the proxy or changing
 * the admin, so it's best if it's a dedicated account that is not used for anything else. This will avoid headaches due
 * to sudden errors when trying to call a function from the proxy implementation.
 *
 * Our recommendation is for the dedicated account to be an instance of the {ProxyAdmin} contract. If set up this way,
 * you should think of the `ProxyAdmin` instance as the real administrative interface of your proxy.
 */
contract TransparentUpgradeableProxy is UpgradeableProxy {
    /**
     * @dev Initializes an upgradeable proxy managed by `_admin`, backed by the implementation at `_logic`, and
     * optionally initialized with `_data` as explained in {UpgradeableProxy-constructor}.
     */
    constructor(address _logic, address admin_, bytes memory _data) payable UpgradeableProxy(_logic, _data) {
        assert(_ADMIN_SLOT == bytes32(uint256(keccak256("eip1967.proxy.admin")) - 1));
        _setAdmin(admin_);
    }

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Modifier used internally that will delegate the call to the implementation unless the sender is the admin.
     */
    modifier ifAdmin() {
        if (msg.sender == _admin()) {
            _;
        } else {
            _fallback();
        }
    }

    /**
     * @dev Returns the current admin.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyAdmin}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function admin() external ifAdmin returns (address admin_) {
        admin_ = _admin();
    }

    /**
     * @dev Returns the current implementation.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-getProxyImplementation}.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using the
     * https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc`
     */
    function implementation() external ifAdmin returns (address implementation_) {
        implementation_ = _implementation();
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-changeProxyAdmin}.
     */
    function changeAdmin(address newAdmin) external virtual ifAdmin {
        require(newAdmin != address(0), "TransparentUpgradeableProxy: new admin is the zero address");
        emit AdminChanged(_admin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev Upgrade the implementation of the proxy.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgrade}.
     */
    function upgradeTo(address newImplementation) external virtual ifAdmin {
        _upgradeTo(newImplementation);
    }

    /**
     * @dev Upgrade the implementation of the proxy, and then call a function from the new implementation as specified
     * by `data`, which should be an encoded function call. This is useful to initialize new storage variables in the
     * proxied contract.
     *
     * NOTE: Only the admin can call this function. See {ProxyAdmin-upgradeAndCall}.
     */
    function upgradeToAndCall(address newImplementation, bytes calldata data) external payable virtual ifAdmin {
        _upgradeTo(newImplementation);
        Address.functionDelegateCall(newImplementation, data);
    }

    /**
     * @dev Returns the current admin.
     */
    function _admin() internal view virtual returns (address adm) {
        bytes32 slot = _ADMIN_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            adm := sload(slot)
        }
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        bytes32 slot = _ADMIN_SLOT;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newAdmin)
        }
    }

    /**
     * @dev Makes sure the admin cannot access the fallback function. See {Proxy-_beforeFallback}.
     */
    function _beforeFallback() internal virtual override {
        require(msg.sender != _admin(), "TransparentUpgradeableProxy: admin cannot fallback to proxy target");
        super._beforeFallback();
    }
}

// File: contracts/interfaces/ICLRDeployer.sol



//SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

interface ICLRDeployer {
    function clrImplementation() external view returns (address);

    function deployCLRPool(address _proxyAdmin) external returns (address pool);

    function deploySCLRToken(address _proxyAdmin)
        external
        returns (address token);

    function owner() external view returns (address);

    function renounceOwnership() external;

    function sCLRTokenImplementation() external view returns (address);

    function setCLRImplementation(address _clrImplementation) external;

    function setsCLRTokenImplementation(address _sCLRTokenImplementation)
        external;

    function transferOwnership(address newOwner) external;
}

// File: @openzeppelin/contracts/proxy/UpgradeableProxy.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

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

/**
 * @dev This contract implements an upgradeable proxy. It is upgradeable because calls are delegated to an
 * implementation address that can be changed. This address is stored in storage in the location specified by
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967], so that it doesn't conflict with the storage layout of the
 * implementation behind the proxy.
 *
 * Upgradeability is only provided internally through {_upgradeTo}. For an externally upgradeable proxy see
 * {TransparentUpgradeableProxy}.
 */
contract UpgradeableProxy is Proxy {
    /**
     * @dev Initializes the upgradeable proxy with an initial implementation specified by `_logic`.
     *
     * If `_data` is nonempty, it's used as data in a delegate call to `_logic`. This will typically be an encoded
     * function call, and allows initializating the storage of the proxy like a Solidity constructor.
     */
    constructor(address _logic, bytes memory _data) payable {
        assert(_IMPLEMENTATION_SLOT == bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1));
        _setImplementation(_logic);
        if(_data.length > 0) {
            Address.functionDelegateCall(_logic, _data);
        }
    }

    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 private constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
    function _implementation() internal view virtual override returns (address impl) {
        bytes32 slot = _IMPLEMENTATION_SLOT;
        // solhint-disable-next-line no-inline-assembly
        assembly {
            impl := sload(slot)
        }
    }

    /**
     * @dev Upgrades the proxy to a new implementation.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal virtual {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(Address.isContract(newImplementation), "UpgradeableProxy: new implementation is not a contract");

        bytes32 slot = _IMPLEMENTATION_SLOT;

        // solhint-disable-next-line no-inline-assembly
        assembly {
            sstore(slot, newImplementation)
        }
    }
}

// File: @openzeppelin/contracts/proxy/Proxy.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev This abstract contract provides a fallback function that delegates all calls to another contract using the EVM
 * instruction `delegatecall`. We refer to the second contract as the _implementation_ behind the proxy, and it has to
 * be specified by overriding the virtual {_implementation} function.
 *
 * Additionally, delegation to the implementation can be triggered manually through the {_fallback} function, or to a
 * different contract through the {_delegate} function.
 *
 * The success and return data of the delegated call will be returned back to the caller of the proxy.
 */
abstract contract Proxy {
    /**
     * @dev Delegates the current call to `implementation`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _delegate(address implementation) internal virtual {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            // Copy msg.data. We take full control of memory in this inline assembly
            // block because it will not return to Solidity code. We overwrite the
            // Solidity scratch pad at memory position 0.
            calldatacopy(0, 0, calldatasize())

            // Call the implementation.
            // out and outsize are 0 because we don't know the size yet.
            let result := delegatecall(gas(), implementation, 0, calldatasize(), 0, 0)

            // Copy the returned data.
            returndatacopy(0, 0, returndatasize())

            switch result
            // delegatecall returns 0 on error.
            case 0 { revert(0, returndatasize()) }
            default { return(0, returndatasize()) }
        }
    }

    /**
     * @dev This is a virtual function that should be overriden so it returns the address to which the fallback function
     * and {_fallback} should delegate.
     */
    function _implementation() internal view virtual returns (address);

    /**
     * @dev Delegates the current call to the address returned by `_implementation()`.
     *
     * This function does not return to its internall call site, it will return directly to the external caller.
     */
    function _fallback() internal virtual {
        _beforeFallback();
        _delegate(_implementation());
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if no other
     * function in the contract matches the call data.
     */
    fallback () external payable virtual {
        _fallback();
    }

    /**
     * @dev Fallback function that delegates calls to the address returned by `_implementation()`. Will run if call data
     * is empty.
     */
    receive () external payable virtual {
        _fallback();
    }

    /**
     * @dev Hook that is called before falling back to the implementation. Can happen as part of a manual `_fallback`
     * call, or as part of the Solidity `fallback` or `receive` functions.
     *
     * If overriden should call `super._beforeFallback()`.
     */
    function _beforeFallback() internal virtual {
    }
}

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



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}