// File: contracts/veToken/VeTokenProxy.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./VeTokenStorage.sol";
import "./AccessControl.sol";

/**
 * @title VeTokenCore
 * @dev Storage for the VeToken is at this address, while execution is delegated to the `veTokenImplementation`.
 */
contract VeTokenProxy is AccessControl, ProxyStorage {
    function setPendingImplementation(
        address newPendingImplementation_
    ) public onlyOwner 
    {
        address oldPendingImplementation = pendingVeTokenImplementation;

        pendingVeTokenImplementation = newPendingImplementation_;

        emit NewPendingImplementation(oldPendingImplementation, pendingVeTokenImplementation);
    }

    /**
    * @notice Accepts new implementation of comptroller. msg.sender must be pendingImplementation
    * @dev Admin function for new implementation to accept it's role as implementation
    */
    function acceptImplementation() public {
        // Check caller is pendingImplementation and pendingImplementation ≠ address(0)
        require (msg.sender == pendingVeTokenImplementation && pendingVeTokenImplementation != address(0),
                "Invalid veTokenImplementation");

        // Save current values for inclusion in log
        address oldImplementation = veTokenImplementation;
        address oldPendingImplementation = pendingVeTokenImplementation;

        veTokenImplementation = oldPendingImplementation;

        pendingVeTokenImplementation = address(0);

        emit NewImplementation(oldImplementation, veTokenImplementation);
        emit NewPendingImplementation(oldPendingImplementation, pendingVeTokenImplementation);
    }
    
    /**
     * @dev Delegates execution to an implementation contract.
     * It returns to the external caller whatever the implementation returns
     * or forwards reverts.
     */
    fallback () external payable {
        // delegate all other functions to current implementation
        (bool success, ) = veTokenImplementation.delegatecall(msg.data);

        assembly {
              let free_mem_ptr := mload(0x40)
              returndatacopy(free_mem_ptr, 0, returndatasize())

              switch success
              case 0 { revert(free_mem_ptr, returndatasize()) }
              default { return(free_mem_ptr, returndatasize()) }
        }
    }

    receive () external payable {}

    function claim (address receiver) external onlyOwner nonReentrant {
        payable(receiver).transfer(address(this).balance);

        emit Claim(receiver);
    }

    /**
      * @notice Emitted when pendingComptrollerImplementation is changed
      */
    event NewPendingImplementation(address oldPendingImplementation, address newPendingImplementation);

    /**
      * @notice Emitted when pendingComptrollerImplementation is accepted, which means comptroller implementation is updated
      */
    event NewImplementation(address oldImplementation, address newImplementation);
   
    /**
      * @notice Emitted when claim eth in contract
      */
    event Claim(address receiver);
}
 
// File: contracts/veToken/VeTokenStorage.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract ProxyStorage {
    /**
    * @notice Active brains of VeTokenProxy
    */
    address public veTokenImplementation;

    /**
    * @notice Pending brains of VeTokenProxy
    */
    address public pendingVeTokenImplementation;
}

contract VeTokenStorage is  ProxyStorage {
    address public token;  // token
    uint256 public supply; // veToken

    // veToken related
    string public name;
    string public symbol;
    string public version;
    uint256 constant decimals = 18;

    // score related
    uint256 public scorePerBlk;
    uint256 public totalStaked;

    mapping (address => UserInfo) internal userInfo;
    PoolInfo public poolInfo;
    uint256 public startBlk;  // start Blk
    uint256 public clearBlk;  // set annually
    
    // User variables
    struct UserInfo {
        uint256 amount;        // How many tokens the user has provided.
        uint256 score;         // score exclude pending amount
        uint256 scoreDebt;     // score debt
        uint256 lastUpdateBlk; // last user's tx Blk
    }

    // Pool variables
    struct PoolInfo {      
        uint256 lastUpdateBlk;     // Last block number that score distribution occurs.
        uint256 accScorePerToken;   // Accumulated socres per token, times 1e12. 
    }

    address public smartWalletChecker;
}

// File: contracts/veToken/AccessControl.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
// import "./Sig.sol";

contract AccessControl is Ownable, ReentrancyGuard {
    using SafeMath for uint256;

    // event ContractUpgrade(address newContract);
    event SetProxy(address proxy);
    event AdminTransferred(address oldAdmin, address newAdmin);
    event FlipStakableState(bool stakeIsActive);
    event FlipClaimableState(bool claimIsActive);
    event TransferAdmin(address oldAdmin, address newAdmin);

    address private _admin;
    address public proxy;
    bool public stakeIsActive = true;
    bool public claimIsActive = true;

    address public constant ZERO_ADDRESS = address(0);

    constructor() {
        _setAdmin(_msgSender());
    }

    // function verified(bytes32 hash, bytes memory signature) public view returns (bool){
    //     return admin() == Sig.recover(hash, signature);
    // }

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

    /**
     * @dev Throws if called by any account other than the admin.
     */
    modifier onlyAdmin() {
        require(admin() == _msgSender(), "Invalid Admin: caller is not the admin");
        _;
    }

    function _setAdmin(address newAdmin) private {
        address oldAdmin = _admin;
        _admin = newAdmin;
        emit AdminTransferred(oldAdmin, newAdmin);
    }

    function setProxy(address _proxy) external onlyOwner {
        require(_proxy != address(0), "Invalid Address");
        proxy = _proxy;

        emit SetProxy(_proxy);
    }

    modifier onlyProxy() {
        require(proxy == _msgSender(), "Not Permit: caller is not the proxy"); 
        _;
    }

    // modifier sigVerified(bytes memory signature) {
    //     require(verified(Sig.ethSignedHash(msg.sender), signature), "Not verified");
    //     _;
    // }

    modifier activeStake() {
        require(stakeIsActive, "Unstakable");
        _;
    } 

    modifier activeClaim() {
        require(claimIsActive, "Unclaimable");
        _;
    } 
    
    modifier notZeroAddr(address addr_) {
        require(addr_ != ZERO_ADDRESS, "Zero address");
        _;
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newAdmin`).
     * Can only be called by the current admin.
     */
    function transferAdmin(address newAdmin) external virtual onlyOwner {
        require(newAdmin != address(0), "Invalid Admin: new admin is the zero address");
        address oldAdmin = admin();
        _setAdmin(newAdmin);

        emit TransferAdmin(oldAdmin, newAdmin);
    }

    /*
    * Pause sale if active, make active if paused
    */
    function flipStakableState() external onlyOwner {
        stakeIsActive = !stakeIsActive;

        emit FlipStakableState(stakeIsActive);
    }

    function flipClaimableState() external onlyOwner {
        claimIsActive = !claimIsActive;

        emit FlipClaimableState(claimIsActive);
    }
}

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



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

    /**
     * @dev 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 {
        _transferOwnership(address(0));
    }

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

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

// File: @openzeppelin/contracts/security/ReentrancyGuard.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

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



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

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
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) {
        unchecked {
            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) {
        unchecked {
            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) {
        unchecked {
            // 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) {
        unchecked {
            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) {
        unchecked {
            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) {
        return a + b;
    }

    /**
     * @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 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) {
        return a * b;
    }

    /**
     * @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.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        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) {
        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) {
        unchecked {
            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.
     *
     * 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) {
        unchecked {
            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) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

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



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

pragma solidity ^0.8.0;

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

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