// SPDX-License-Identifier: GPL-3.0

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 SafeMathUpgradeable {
    /**
     * @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;
    }
}
[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract BeforeAwardListenerInterface","name":"beforeAwardListener","type":"address"}],"name":"BeforeAwardListenerSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract IERC20Upgradeable","name":"externalErc20","type":"address"}],"name":"ExternalErc20AwardAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract IERC20Upgradeable","name":"externalErc20Award","type":"address"}],"name":"ExternalErc20AwardRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract IERC721Upgradeable","name":"externalErc721","type":"address"},{"indexed":false,"internalType":"uint256[]","name":"tokenIds","type":"uint256[]"}],"name":"ExternalErc721AwardAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract IERC721Upgradeable","name":"externalErc721Award","type":"address"}],"name":"ExternalErc721AwardRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"prizePeriodStart","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"prizePeriodSeconds","type":"uint256"},{"indexed":true,"internalType":"contract PrizePool","name":"prizePool","type":"address"},{"indexed":false,"internalType":"contract TicketInterface","name":"ticket","type":"address"},{"indexed":false,"internalType":"contract RNGInterface","name":"rng","type":"address"},{"indexed":false,"internalType":"contract IERC20Upgradeable[]","name":"externalErc20Awards","type":"address[]"}],"name":"Initialized","type":"event"},{"anonymous":false,"inputs":[],"name":"NoWinners","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"numberOfWinners","type":"uint256"}],"name":"NumberOfWinnersSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract PeriodicPrizeStrategyListenerInterface","name":"periodicPrizeStrategyListener","type":"address"}],"name":"PeriodicPrizeStrategyListenerSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"prizePeriodSeconds","type":"uint256"}],"name":"PrizePeriodSecondsUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":true,"internalType":"address","name":"prizePool","type":"address"},{"indexed":true,"internalType":"uint32","name":"rngRequestId","type":"uint32"},{"indexed":false,"internalType":"uint32","name":"rngLockBlock","type":"uint32"}],"name":"PrizePoolAwardCancelled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":true,"internalType":"address","name":"prizePool","type":"address"},{"indexed":true,"internalType":"uint32","name":"rngRequestId","type":"uint32"},{"indexed":false,"internalType":"uint32","name":"rngLockBlock","type":"uint32"}],"name":"PrizePoolAwardStarted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"uint256","name":"randomNumber","type":"uint256"}],"name":"PrizePoolAwarded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":true,"internalType":"uint256","name":"prizePeriodStartedAt","type":"uint256"}],"name":"PrizePoolOpened","type":"event"},{"anonymous":false,"inputs":[],"name":"RngRequestFailed","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint32","name":"rngRequestTimeout","type":"uint32"}],"name":"RngRequestTimeoutSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract RNGInterface","name":"rngService","type":"address"}],"name":"RngServiceUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bool","name":"splitExternalErc20Awards","type":"bool"}],"name":"SplitExternalErc20AwardsSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"contract TokenListenerInterface","name":"tokenListener","type":"address"}],"name":"TokenListenerUpdated","type":"event"},{"inputs":[{"internalType":"contract IERC20Upgradeable","name":"_externalErc20","type":"address"}],"name":"addExternalErc20Award","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC20Upgradeable[]","name":"_externalErc20s","type":"address[]"}],"name":"addExternalErc20Awards","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC721Upgradeable","name":"_externalErc721","type":"address"},{"internalType":"uint256[]","name":"_tokenIds","type":"uint256[]"}],"name":"addExternalErc721Award","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"beforeAwardListener","outputs":[{"internalType":"contract BeforeAwardListenerInterface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"controlledToken","type":"address"}],"name":"beforeTokenMint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"controlledToken","type":"address"}],"name":"beforeTokenTransfer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"currentTime","type":"uint256"}],"name":"calculateNextPrizePeriodStartTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"canCompleteAward","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"canStartAward","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"cancelAward","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"completeAward","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"currentPrize","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"secondsPerBlockMantissa","type":"uint256"}],"name":"estimateRemainingBlocksToPrize","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getExternalErc20Awards","outputs":[{"internalType":"address[]","name":"","type":"address[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC721Upgradeable","name":"_externalErc721","type":"address"}],"name":"getExternalErc721AwardTokenIds","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getExternalErc721Awards","outputs":[{"internalType":"address[]","name":"","type":"address[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getLastRngLockBlock","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getLastRngRequestId","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_prizePeriodStart","type":"uint256"},{"internalType":"uint256","name":"_prizePeriodSeconds","type":"uint256"},{"internalType":"contract PrizePool","name":"_prizePool","type":"address"},{"internalType":"contract TicketInterface","name":"_ticket","type":"address"},{"internalType":"contract RNGInterface","name":"_rng","type":"address"},{"internalType":"contract IERC20Upgradeable[]","name":"externalErc20Awards","type":"address[]"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_prizePeriodStart","type":"uint256"},{"internalType":"uint256","name":"_prizePeriodSeconds","type":"uint256"},{"internalType":"contract PrizePool","name":"_prizePool","type":"address"},{"internalType":"contract TicketInterface","name":"_ticket","type":"address"},{"internalType":"contract RNGInterface","name":"_rng","type":"address"},{"internalType":"uint256","name":"_numberOfWinners","type":"uint256"}],"name":"initializeMultipleWinners","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"isPrizePeriodOver","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isRngCompleted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isRngRequested","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"isRngTimedOut","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"numberOfWinners","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"periodicPrizeStrategyListener","outputs":[{"internalType":"contract PeriodicPrizeStrategyListenerInterface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"prizePeriodEndAt","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"prizePeriodRemainingSeconds","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"prizePeriodSeconds","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"prizePeriodStartedAt","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"prizePool","outputs":[{"internalType":"contract PrizePool","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20Upgradeable","name":"_externalErc20","type":"address"},{"internalType":"contract IERC20Upgradeable","name":"_prevExternalErc20","type":"address"}],"name":"removeExternalErc20Award","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC721Upgradeable","name":"_externalErc721","type":"address"},{"internalType":"contract IERC721Upgradeable","name":"_prevExternalErc721","type":"address"}],"name":"removeExternalErc721Award","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rng","outputs":[{"internalType":"contract RNGInterface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rngRequestTimeout","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract BeforeAwardListenerInterface","name":"_beforeAwardListener","type":"address"}],"name":"setBeforeAwardListener","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"count","type":"uint256"}],"name":"setNumberOfWinners","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract PeriodicPrizeStrategyListenerInterface","name":"_periodicPrizeStrategyListener","type":"address"}],"name":"setPeriodicPrizeStrategyListener","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_prizePeriodSeconds","type":"uint256"}],"name":"setPrizePeriodSeconds","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint32","name":"_rngRequestTimeout","type":"uint32"}],"name":"setRngRequestTimeout","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract RNGInterface","name":"rngService","type":"address"}],"name":"setRngService","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"_splitExternalErc20Awards","type":"bool"}],"name":"setSplitExternalErc20Awards","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract TokenListenerInterface","name":"_tokenListener","type":"address"}],"name":"setTokenListener","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"splitExternalErc20Awards","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"sponsorship","outputs":[{"internalType":"contract IERC20Upgradeable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"startAward","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"ticket","outputs":[{"internalType":"contract TicketInterface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenListener","outputs":[{"internalType":"contract TokenListenerInterface","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]