// File: contracts/SwapRewards.sol



// SPDX-License-Identifier: Apache-2.0
pragma solidity >=0.6.0 <=0.8.9;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./interfaces/ISwapContract.sol";

contract SwapRewards is Ownable {
    using SafeMath for uint256;

    IERC20 public immutable rewardToken; //swingby
    ISwapContract public swapContract;
    uint256 public rebateRate = 30; // BPS base
    uint256 public thresholdRatio = 55; // diff is over 10%
    uint256 public pricePerBTC;

    event Paid(address to, uint256 amount, uint256 rebate);

    constructor(
        address _owner,
        address _swingby,
        uint256 _pricePerBTC
    ) {
        require(_owner != address(0), "owner address is not be 0x0");
        require(_swingby != address(0), "swingby address must not be 0x0");

        transferOwnership(_owner);
        rewardToken = IERC20(_swingby);
        pricePerBTC = _pricePerBTC;
    }

    // expected DAO executes this
    function setSWINGBYPrice(uint256 _pricePerBTC) external {
        require(msg.sender == owner(), "!owner");
        pricePerBTC = _pricePerBTC;
    }

    function setSwap(
        address _swap,
        uint256 _newRebateRate,
        uint256 _thresholdRatio
    ) external {
        require(msg.sender == owner(), "!owner");
        require(
            _newRebateRate >= 0 && _newRebateRate <= 100,
            "_newRebateRate is not valid"
        );
        require(
            _thresholdRatio >= 20 && _thresholdRatio <= 100,
            "_thresholdRatio is not valid"
        );
        swapContract = ISwapContract(_swap);
        rebateRate = _newRebateRate;
        thresholdRatio = _thresholdRatio;
    }

    // pullRewards transfers the funds to the user
    function pullRewards(
        address _dest,
        address _receiver,
        uint256 _swapped
    ) external returns (bool) {
        require(
            msg.sender == address(swapContract),
            "caller is not swap contact"
        );
        address tokenB = swapContract.BTCT_ADDR();
        (uint256 balA, uint256 balB) = swapContract.getFloatReserve(
            address(0),
            tokenB
        );
        uint256 threshold = balA.add(balB).mul(thresholdRatio).div(100);
        if (
            (_dest == tokenB && balB >= threshold) ||
            (_dest == address(0) && balA >= threshold)
        ) {
            uint256 amount = _swapped.mul(rebateRate).mul(pricePerBTC).mul(1e6);
            rewardToken.transfer(_receiver, amount); // decimals == 18 for payout
            emit Paid(_receiver, _swapped, amount);
        }
        return true;
    }

    // pullRewardsMulti transfers the funds to the user
    function pullRewardsMulti(
        address _dest,
        address[] memory _receiver,
        uint256[] memory _swapped
    ) external returns (bool) {
        require(
            msg.sender == address(swapContract),
            "caller is not swap contact"
        );
        require(_receiver.length == _swapped.length, "array size is not match");
        address tokenB = swapContract.BTCT_ADDR();
        (uint256 balA, uint256 balB) = swapContract.getFloatReserve(
            address(0),
            tokenB
        );
        uint256 threshold = balA.add(balB).mul(thresholdRatio).div(100);
        if (
            (_dest == tokenB && balB >= threshold) ||
            (_dest == address(0) && balA >= threshold)
        ) {
            for (uint256 i = 0; i < _receiver.length; i++) {
                uint256 amount = _swapped[i]
                    .mul(rebateRate)
                    .mul(pricePerBTC)
                    .mul(1e6);
                rewardToken.transfer(_receiver[i], amount); // decimals == 18 for payout
                emit Paid(_receiver[i], _swapped[i], amount);
            }
        }
        return true;
    }
}

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



// SPDX-License-Identifier: MIT

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() {
        _setOwner(_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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

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



// SPDX-License-Identifier: MIT

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 no longer needed starting with Solidity 0.8. 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/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^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: contracts/interfaces/ISwapContract.sol



// SPDX-License-Identifier: AGPL-3.0
pragma solidity >=0.6.0 <=0.8.9;
pragma experimental ABIEncoderV2;

import "./lib/Utils.sol";

interface ISwapContract {
    
    function BTCT_ADDR() external returns (address);

    function singleTransferERC20(
        address _destToken,
        address _to,
        uint256 _amount,
        uint256 _totalSwapped,
        uint256 _rewardsAmount,
        bytes32[] memory _redeemedFloatTxIds
    ) external returns (bool);

    function multiTransferERC20TightlyPacked(
        address _destToken,
        bytes32[] memory _addressesAndAmounts,
        uint256 _totalSwapped,
        uint256 _rewardsAmount,
        bytes32[] memory _redeemedFloatTxIds
    ) external returns (bool);

    function collectSwapFeesForBTC(
        uint256 _incomingAmount,
        uint256 _minerFee,
        uint256 _rewardsAmount,
        address[] memory _spenders,
        uint256[] memory _swapAmounts,
        bool    _isUpdatelimitBTCForSPFlow2
    ) external returns (bool);

    function recordIncomingFloat(
        address _token,
        bytes32 _addressesAndAmountOfFloat,
        bytes32 _txid
    ) external returns (bool);

    function recordOutcomingFloat(
        address _token,
        bytes32 _addressesAndAmountOfLPtoken,
        uint256 _minerFee,
        bytes32 _txid
    ) external returns (bool);

    function recordSkyPoolsTX(
        address _to,
        uint256 _totalSwapped,
        uint256 _rewardsAmount,
        bytes32[] memory _usedTxIds
    ) external returns (bool);

    function spFlow1SimpleSwap(Utils.SimpleData calldata _data) external;

    function spFlow1Uniswap(
        bool _fork,
        address _factory,
        bytes32 _initCode,
        uint256 _amountIn,
        uint256 _amountOutMin,
        address[] calldata _path
    ) external returns (uint256 receivedAmount);

    function spFlow2Uniswap(
        string memory _destinationAddressForBTC,
        bool _fork,
        address _factory,
        bytes32 _initCode,
        uint256 _amountIn,
        uint256 _amountOutMin,
        address[] calldata _path
    ) external returns (uint256 receivedAmount);

    function spFlow2SimpleSwap(
        string memory _destinationAddressForBTC,
        Utils.SimpleData calldata _data
    ) external returns (uint256 receivedAmount);

    function spCleanUpOldTXs() external;

    function spDeposit(address _token, uint256 _amount) external payable;

    function redeemEther(uint256 _amount) external;

    function redeemERC20Token(address _token, uint256 _amount) external;

    function recordUTXOSweepMinerFee(uint256 _minerFee, bytes32 _txid)
        external
        returns (bool);

    function churn(
        address _newOwner,
        address[] memory _nodes,
        bool[] memory _isRemoved,
        uint8 _churnedInCount,
        uint8 _tssThreshold
    ) external returns (bool);

    function isTxUsed(bytes32 _txid) external view returns (bool);

    function getCurrentPriceLP() external view returns (uint256);

    function getFloatReserve(address _tokenA, address _tokenB)
        external
        returns (uint256 reserveA, uint256 reserveB);

    function getActiveNodes() external view returns (address[] memory);

    function isNodeStake(address _user) external returns (bool);
}

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



// SPDX-License-Identifier: MIT

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;
    }
}

// File: contracts/interfaces/lib/Utils.sol



// SPDX-License-Identifier: AGPL-3.0

pragma solidity >=0.6.0 <=0.8.9;

library Utils {
    /**
   * @param fromToken Address of the source token
   * @param fromAmount Amount of source tokens to be swapped
   * @param toAmount Minimum destination token amount expected out of this swap
   * @param expectedAmount Expected amount of destination tokens without slippage
   * @param beneficiary Beneficiary address
   * 0 then 100% will be transferred to beneficiary. Pass 10000 for 100%
   * @param path Route to be taken for this swap to take place

   */
    struct SellData {
        address fromToken;
        uint256 fromAmount;
        uint256 toAmount;
        uint256 expectedAmount;
        address payable beneficiary;
        Utils.Path[] path;
        address payable partner;
        uint256 feePercent;
        bytes permit;
        uint256 deadline;
        bytes16 uuid;
    }

    struct MegaSwapSellData {
        address fromToken;
        uint256 fromAmount;
        uint256 toAmount;
        uint256 expectedAmount;
        address payable beneficiary;
        Utils.MegaSwapPath[] path;
        address payable partner;
        uint256 feePercent;
        bytes permit;
        uint256 deadline;
        bytes16 uuid;
    }

    struct SimpleData {
        address fromToken;
        address toToken;
        uint256 fromAmount;
        uint256 toAmount;
        uint256 expectedAmount;
        address[] callees;
        bytes exchangeData;
        uint256[] startIndexes;
        uint256[] values;
        address payable beneficiary;
        address payable partner;
        uint256 feePercent;
        bytes permit;
        uint256 deadline;
        bytes16 uuid;
    }

    struct Adapter {
        address payable adapter;
        uint256 percent;
        uint256 networkFee;
        Route[] route;
    }

    struct Route {
        uint256 index;//Adapter at which index needs to be used
        address targetExchange;
        uint percent;
        bytes payload;
        uint256 networkFee;//Network fee is associated with 0xv3 trades
    }

    struct MegaSwapPath {
        uint256 fromAmountPercent;
        Path[] path;
    }

    struct Path {
        address to;
        uint256 totalNetworkFee;//Network fee is associated with 0xv3 trades
        Adapter[] adapters;
    }
}