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// SPDX-License-Identifier: MIT

pragma solidity ^0.6.12;

import "../libraries/math/SafeMath.sol";

import "../access/Governable.sol";
import "../peripherals/interfaces/ITimelock.sol";

import "./interfaces/IReferralStorage.sol";

contract ReferralStorage is Governable, IReferralStorage {
    using SafeMath for uint256;

    struct Tier {
        uint256 totalRebate; // e.g. 2400 for 24%
        uint256 discountShare; // 5000 for 50%/50%, 7000 for 30% rebates/70% discount
    }

    uint256 public constant BASIS_POINTS = 10000;

    mapping (address => uint256) public override referrerDiscountShares; // to override default value in tier
    mapping (address => uint256) public override referrerTiers; // link between user <> tier
    mapping (uint256 => Tier) public tiers;

    mapping (address => bool) public isHandler;

    mapping (bytes32 => address) public override codeOwners;
    mapping (address => bytes32) public override traderReferralCodes;

    event SetHandler(address handler, bool isActive);
    event SetTraderReferralCode(address account, bytes32 code);
    event SetTier(uint256 tierId, uint256 totalRebate, uint256 discountShare);
    event SetReferrerTier(address referrer, uint256 tierId);
    event SetReferrerDiscountShare(address referrer, uint256 discountShare);
    event RegisterCode(address account, bytes32 code);
    event SetCodeOwner(address account, address newAccount, bytes32 code);
    event GovSetCodeOwner(bytes32 code, address newAccount);

    modifier onlyHandler() {
        require(isHandler[msg.sender], "ReferralStorage: forbidden");
        _;
    }

    function setHandler(address _handler, bool _isActive) external onlyGov {
        isHandler[_handler] = _isActive;
        emit SetHandler(_handler, _isActive);
    }

    function setTier(uint256 _tierId, uint256 _totalRebate, uint256 _discountShare) external override onlyGov {
        require(_totalRebate <= BASIS_POINTS, "ReferralStorage: invalid totalRebate");
        require(_discountShare <= BASIS_POINTS, "ReferralStorage: invalid discountShare");

        Tier memory tier = tiers[_tierId];
        tier.totalRebate = _totalRebate;
        tier.discountShare = _discountShare;
        tiers[_tierId] = tier;
        emit SetTier(_tierId, _totalRebate, _discountShare);
    }

    function setReferrerTier(address _referrer, uint256 _tierId) external override onlyGov {
        referrerTiers[_referrer] = _tierId;
        emit SetReferrerTier(_referrer, _tierId);
    }

    function setReferrerDiscountShare(uint256 _discountShare) external {
        require(_discountShare <= BASIS_POINTS, "ReferralStorage: invalid discountShare");

        referrerDiscountShares[msg.sender] = _discountShare;
        emit SetReferrerDiscountShare(msg.sender, _discountShare);
    }

    function setTraderReferralCode(address _account, bytes32 _code) external override onlyHandler {
        _setTraderReferralCode(_account, _code);
    }

    function setTraderReferralCodeByUser(bytes32 _code) external {
        _setTraderReferralCode(msg.sender, _code);
    }

    function registerCode(bytes32 _code) external {
        require(_code != bytes32(0), "ReferralStorage: invalid _code");
        require(codeOwners[_code] == address(0), "ReferralStorage: code already exists");

        codeOwners[_code] = msg.sender;
        emit RegisterCode(msg.sender, _code);
    }

    function setCodeOwner(bytes32 _code, address _newAccount) external {
        require(_code != bytes32(0), "ReferralStorage: invalid _code");

        address account = codeOwners[_code];
        require(msg.sender == account, "ReferralStorage: forbidden");

        codeOwners[_code] = _newAccount;
        emit SetCodeOwner(msg.sender, _newAccount, _code);
    }

    function govSetCodeOwner(bytes32 _code, address _newAccount) external override onlyGov {
        require(_code != bytes32(0), "ReferralStorage: invalid _code");

        codeOwners[_code] = _newAccount;
        emit GovSetCodeOwner(_code, _newAccount);
    }

    function getTraderReferralInfo(address _account) external override view returns (bytes32, address) {
        bytes32 code = traderReferralCodes[_account];
        address referrer;
        if (code != bytes32(0)) {
            referrer = codeOwners[code];
        }
        return (code, referrer);
    }

    function _setTraderReferralCode(address _account, bytes32 _code) private {
        traderReferralCodes[_account] = _code;
        emit SetTraderReferralCode(_account, _code);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

contract Governable {
    address public gov;

    constructor() public {
        gov = msg.sender;
    }

    modifier onlyGov() {
        require(msg.sender == gov, "Governable: forbidden");
        _;
    }

    function setGov(address _gov) external onlyGov {
        gov = _gov;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

/**
 * @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;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface ITimelock {
    function marginFeeBasisPoints() external returns (uint256);
    function setAdmin(address _admin) external;
    function enableLeverage(address _vault) external;
    function disableLeverage(address _vault) external;
    function setIsLeverageEnabled(address _vault, bool _isLeverageEnabled) external;
    function signalSetGov(address _target, address _gov) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IReferralStorage {
    function codeOwners(bytes32 _code) external view returns (address);
    function traderReferralCodes(address _account) external view returns (bytes32);
    function referrerDiscountShares(address _account) external view returns (uint256);
    function referrerTiers(address _account) external view returns (uint256);
    function getTraderReferralInfo(address _account) external view returns (bytes32, address);
    function setTraderReferralCode(address _account, bytes32 _code) external;
    function setTier(uint256 _tierId, uint256 _totalRebate, uint256 _discountShare) external;
    function setReferrerTier(address _referrer, uint256 _tierId) external;
    function govSetCodeOwner(bytes32 _code, address _newAccount) external;
}

{
  "metadata": {
    "bytecodeHash": "none",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 1
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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unt","type":"address"},{"internalType":"bytes32","name":"_code","type":"bytes32"}],"name":"setTraderReferralCode","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_code","type":"bytes32"}],"name":"setTraderReferralCodeByUser","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"tiers","outputs":[{"internalType":"uint256","name":"totalRebate","type":"uint256"},{"internalType":"uint256","name":"discountShare","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"traderReferralCodes","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"}]

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