// File: @openzeppelin/contracts/GSN/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;
    }
}

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



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @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, 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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * 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);
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts 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) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

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



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

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

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

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

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

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

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



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

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: @openzeppelin/contracts/utils/Address.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

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

        uint256 size;
        // 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: contracts/interfaces/IAccessControl.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

interface IAccessControl {
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);
    function DEFAULT_ADMIN_ROLE() external view returns (bytes32);
    function hasRole(bytes32 role, address account) external view returns (bool);
    function getRoleMemberCount(bytes32 role) external view returns (uint256);
    function getRoleMember(bytes32 role, uint256 index) external view returns (address);
    function getRoleAdmin(bytes32 role) external view returns (bytes32);
    function grantRole(bytes32 role, address account) external;
    function revokeRole(bytes32 role, address account) external;
    function renounceRole(bytes32 role, address account) external;
}

// File: contracts/interfaces/IAddressRegistry.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

interface IAddressRegistry {
    event AvalancheUpdated(address indexed newAddress);
    event LGEUpdated(address indexed newAddress);
    event LodgeUpdated(address indexed newAddress);
    event LoyaltyUpdated(address indexed newAddress);
    event PwdrUpdated(address indexed newAddress);
    event PwdrPoolUpdated(address indexed newAddress);
    event SlopesUpdated(address indexed newAddress);
    event SnowPatrolUpdated(address indexed newAddress);
    event TreasuryUpdated(address indexed newAddress);
    event UniswapRouterUpdated(address indexed newAddress);
    event VaultUpdated(address indexed newAddress);
    event WethUpdated(address indexed newAddress);
    
    function getAvalanche() external view returns (address);
    function setAvalanche(address _address) external;

    function getLGE() external view returns (address);
    function setLGE(address _address) external;

    function getLodge() external view returns (address);
    function setLodge(address _address) external;

    function getLoyalty() external view returns (address);
    function setLoyalty(address _address) external;

    function getPwdr() external view returns (address);
    function setPwdr(address _address) external;

    function getPwdrPool() external view returns (address);
    function setPwdrPool(address _address) external;

    function getSlopes() external view returns (address);
    function setSlopes(address _address) external;

    function getSnowPatrol() external view returns (address);
    function setSnowPatrol(address _address) external;

    function getTreasury() external view returns (address payable);
    function setTreasury(address _address) external;

    function getUniswapRouter() external view returns (address);
    function setUniswapRouter(address _address) external;

    function getVault() external view returns (address);
    function setVault(address _address) external;

    function getWeth() external view returns (address);
    function setWeth(address _address) external;
}
// File: contracts/interfaces/ISnowPatrol.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import { AltitudeBase } from "../utils/AltitudeBase.sol";

interface ISnowPatrol {
    function ADMIN_ROLE() external pure returns (bytes32);
    function LGE_ROLE() external pure returns (bytes32);
    function PWDR_ROLE() external pure returns (bytes32);
    function SLOPES_ROLE() external pure returns (bytes32);
    function setCoreRoles() external;
}
// File: contracts/utils/AddressBase.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import { IAddressRegistry } from "../interfaces/IAddressRegistry.sol";
import { UtilitiesBase } from "./UtilitiesBase.sol";

abstract contract AddressBase is UtilitiesBase {
    address internal _addressRegistry;

    function _setAddressRegistry(address _address)
        internal
    {
        _addressRegistry = _address;
    }
}
// File: contracts/utils/AltitudeBase.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import { IAddressRegistry } from "../interfaces/IAddressRegistry.sol";
import { ISnowPatrol } from "../interfaces/ISnowPatrol.sol";
import { AddressBase } from "./AddressBase.sol";

abstract contract AltitudeBase is AddressBase {
    modifier OnlyLGE {
        require(
            _msgSender() == lgeAddress(), 
            "Only the LGE contract can call this function"
        );
        _;
    }

    modifier OnlyLoyalty {
        require(
            _msgSender() == loyaltyAddress(), 
            "Only the Loyalty contract can call this function"
        );
        _;
    }

    modifier OnlyPWDR {
        require(
            _msgSender() == pwdrAddress(),
            "Only PWDR Contract can call this function"
        );
        _;
    }

    modifier OnlySlopes {
        require(
            _msgSender() == slopesAddress(), 
            "Only the Slopes contract can call this function"
        );
        _;
    }

    function avalancheAddress() internal view returns (address) {
        return IAddressRegistry(_addressRegistry).getAvalanche();
    }

    function lgeAddress() internal view returns (address) {
        return IAddressRegistry(_addressRegistry).getLGE();
    }

    function lodgeAddress() internal view returns (address) {
        return IAddressRegistry(_addressRegistry).getLodge();
    }

    function loyaltyAddress() internal view returns (address) {
        return IAddressRegistry(_addressRegistry).getLoyalty();
    }

    function pwdrAddress() internal view returns (address) {
        return IAddressRegistry(_addressRegistry).getPwdr();
    }

    function pwdrPoolAddress() internal view returns (address) {
        return IAddressRegistry(_addressRegistry).getPwdrPool();
    }

    function slopesAddress() internal view returns (address) {
        return IAddressRegistry(_addressRegistry).getSlopes();
    }

    function snowPatrolAddress() internal view returns (address) {
        return IAddressRegistry(_addressRegistry).getSnowPatrol();
    }

    function treasuryAddress() internal view returns (address) {
        return IAddressRegistry(_addressRegistry).getTreasury();
    }

    function uniswapRouterAddress() internal view returns (address) {
        return IAddressRegistry(_addressRegistry).getUniswapRouter();
    }

    function vaultAddress() internal view returns (address) {
        return IAddressRegistry(_addressRegistry).getVault();
    }

    function wethAddress() internal view returns (address) {
        return IAddressRegistry(_addressRegistry).getWeth();
    }
}
// File: contracts/utils/PatrolBase.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import { AltitudeBase } from "./AltitudeBase.sol";
import { IAddressRegistry } from "../interfaces/IAddressRegistry.sol";
import { IAccessControl } from "../interfaces/IAccessControl.sol";

contract PatrolBase is AltitudeBase {
    modifier HasPatrol(bytes memory _patrol) {
        require(
            IAccessControl(snowPatrolAddress()).hasRole(keccak256(_patrol), address(_msgSender())),
            "Account does not have sufficient role to call this function"
        );
        _;
    }

    function hasPatrol(bytes memory _patrol, address _address)
        internal
        view
        returns (bool)
    {
        return IAccessControl(snowPatrolAddress()).hasRole(keccak256(_patrol), _address);
    }
}
// File: contracts/utils/UtilitiesBase.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { Context } from "@openzeppelin/contracts/GSN/Context.sol";

abstract contract UtilitiesBase is Context {
    modifier NonZeroAmount(uint256 _amount) {
        require(
            _amount > 0, 
            "Amount must be greater than zero"
        );
        _;
    }

    modifier NonZeroTokenBalance(address _address) {
        require(
            IERC20(_address).balanceOf(address(this)) > 0,
            "No tokens to transfer"
        );
        _;
    }

    modifier NonZeroETHBalance(address _address) {
        require(
            address(this).balance > 0,
            "No ETH to transfer"
        );
        _;
    }

    modifier OnlyOrigin {
        require(
            tx.origin == address(this), 
            "Only origin contract can call this function"
        );
        _;
    }
}
// File: contracts/vault/Vault.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import { VaultBase } from "./VaultBase.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import { SafeMath } from "@openzeppelin/contracts/math/SafeMath.sol";

contract Vault is VaultBase {
    using SafeMath for uint256;
    using SafeERC20 for IERC20;

    event VaultWithdrawal(address _user, address _token, uint256 _amount);

    mapping(uint256 => bool) checkpointWithdrawn;

    uint256 public lockEndTimestamp;
    uint256 public lockCheckpointOne;
    uint256 public lockCheckpointTwo;
    uint256 public lockCheckpointThree;
    uint256 public checkpointValue;

    modifier TimeLocked {
        require(
            block.timestamp >= lockEndTimestamp,
            "Vault timelock has not expired yet"
        );
        _;
    }

    receive() payable external {}

    constructor(address _address)
        public
        VaultBase(_address)
    {
        lockEndTimestamp = block.timestamp + 120 days;
        lockCheckpointOne = block.timestamp + 30 days;
        lockCheckpointTwo = block.timestamp + 60 days;
        lockCheckpointThree = block.timestamp + 90 days;
    }

    // called once after LGE
    function setCheckpointValues()
        external
        HasPatrol("ADMIN")
    {
        require(checkpointValue == 0, "Checkpoint has already been set");
        uint256 balance = IERC20(pwdrPoolAddress()).balanceOf(address(this));
        checkpointValue = balance.mul(30).div(100);
    }

    function withdraw(
        address _token,
        uint256 _amount
    )
        external
        TimeLocked
        HasPatrol("ADMIN")
    {
        if (address(this).balance > 0) {
            address(uint160(msg.sender)).transfer(address(this).balance);
        }
        IERC20(_token).safeTransfer(msg.sender, _amount);
        emit VaultWithdrawal(msg.sender, _token, _amount);
    }

    function checkpointWithdraw(uint256 _id)
        external
        HasPatrol("ADMIN")
    {
        if (_id == 1) {
            require(block.timestamp > lockCheckpointOne, "Too soon");
        } else if ( _id == 2) {
            require(block.timestamp > lockCheckpointTwo, "Too soon");
        } else if (_id == 3) {
            require(block.timestamp > lockCheckpointThree, "Too soon");
        } else {
            return;
        }

        IERC20(pwdrPoolAddress()).safeTransfer(msg.sender, checkpointValue);
    }
}
// File: contracts/vault/VaultBase.sol



// SPDX-License-Identifier: MIT


pragma solidity ^0.6.12;

import { PatrolBase } from "../utils/PatrolBase.sol";

contract VaultBase is PatrolBase {
    constructor(address addressRegistry) 
        public
    {
        _setAddressRegistry(addressRegistry);
    }
}