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// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;

import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "../../periphery/WithdrawableV2.sol";
import "../../interfaces/IPendleLiquidityMiningV2Multi.sol";
import "../../interfaces/IPendlePausingManager.sol";
import "../../interfaces/IPendleWhitelist.sol";
import "../../libraries/MathLib.sol";
import "../../libraries/TokenUtilsLib.sol";
import "../PendleSimpleERC20TokenHolder.sol";

/*
- stakeToken is the token to be used to stake into this contract to receive rewards
- yieldTokens are tokens generated by stakeToken while it's being staked. For example, Sushi's LP
token generates SUSHI(if it's in Onsen program), or Pendle's Aave LP generates aToken
- If there is no yieldTokens, it should be set to address(0) to save gas
*/
contract PendleLiquidityMiningBaseV2Multi is
    IPendleLiquidityMiningV2Multi,
    WithdrawableV2,
    ReentrancyGuard
{
    using Math for uint256;
    using SafeMath for uint256;
    using PairTokensLib for PairUints;
    using PairTokensLib for PairTokens;
    using TokenUtils for IERC20;

    struct ConstructorArgs {
        address governanceManager;
        address pausingManager;
        address whitelist;
        PairTokens rewardTokens;
        address stakeToken;
        PairTokens yieldTokens;
        uint256 startTime;
        uint256 epochDuration;
        uint256 vestingEpochs;
        IWETH weth;
    }

    struct EpochData {
        uint256 totalStakeUnits;
        PairUints totalRewards;
        uint256 lastUpdated;
        mapping(address => uint256) stakeUnitsForUser;
        mapping(address => PairUints) availableRewardsForUser;
    }

    IPendleWhitelist public immutable whitelist;
    IPendlePausingManager public immutable pausingManager;
    IWETH public immutable weth;

    uint256 public override numberOfEpochs;
    uint256 public override totalStake;
    mapping(uint256 => EpochData) internal epochData;
    mapping(address => uint256) public override balances;
    mapping(address => uint256) public lastTimeUserStakeUpdated;
    mapping(address => uint256) public lastEpochClaimed;

    PairTokens public rewardTokens;
    address public immutable override stakeToken;
    PairTokens public yieldTokens;
    address public immutable rewardTokensHolder;
    uint256 public immutable override startTime;
    uint256 public immutable override epochDuration;
    uint256 public immutable override vestingEpochs;
    uint256 public constant MULTIPLIER = 10**20;

    // yieldTokens-related
    mapping(address => PairUints) public dueInterests;
    mapping(address => PairUints) public lastParamL;
    PairUints public lastNYield;
    PairUints public paramL;

    modifier hasStarted() {
        require(getCurrentEpochId() > 0, "NOT_STARTED");
        _;
    }

    modifier nonContractOrWhitelisted() {
        bool isEOA = !Address.isContract(msg.sender) && tx.origin == msg.sender;
        require(isEOA || whitelist.whitelisted(msg.sender), "CONTRACT_NOT_WHITELISTED");
        _;
    }

    modifier isUserAllowedToUse() {
        (bool paused, ) = pausingManager.checkLiqMiningStatus(address(this));
        require(!paused, "LIQ_MINING_PAUSED");
        require(numberOfEpochs > 0, "NOT_FUNDED");
        require(getCurrentEpochId() > 0, "NOT_STARTED");
        _;
    }

    constructor(ConstructorArgs memory args) PermissionsV2(args.governanceManager) {
        require(args.startTime > block.timestamp, "INVALID_START_TIME");
        require(args.vestingEpochs > 0, "INVALID_VESTING_EPOCHS");
        args.rewardTokens.verify();
        args.yieldTokens.verify();

        weth = args.weth;
        pausingManager = IPendlePausingManager(args.pausingManager);
        whitelist = IPendleWhitelist(args.whitelist);
        rewardTokens = args.rewardTokens;

        stakeToken = args.stakeToken;
        yieldTokens = args.yieldTokens;
        startTime = args.startTime;
        epochDuration = args.epochDuration;
        vestingEpochs = args.vestingEpochs;
        paramL = PairUints(1, 1);

        rewardTokensHolder = address(
            new PendleSimpleERC20TokenHolder(args.rewardTokens.toArr(), address(this))
        );
    }

    /**
    @notice set up emergencyMode by pulling all tokens back to this contract & approve spender to
    spend infinity amount
    */
    function setUpEmergencyMode(address spender, bool) external virtual override {
        (, bool emergencyMode) = pausingManager.checkLiqMiningStatus(address(this));
        require(emergencyMode, "NOT_EMERGENCY");

        (address liqMiningEmergencyHandler, , ) = pausingManager.liqMiningEmergencyHandler();
        require(msg.sender == liqMiningEmergencyHandler, "NOT_EMERGENCY_HANDLER");

        //pulling our rewardTokens back
        rewardTokens.safeTransferFrom(
            rewardTokensHolder,
            address(this),
            rewardTokens.balanceOf(rewardTokensHolder)
        );
        rewardTokens.infinityApprove(spender);
        IERC20(stakeToken).safeApprove(spender, type(uint256).max);
        yieldTokens.infinityApprove(spender);
    }

    /**
    @notice create new epochs & fund rewards for them
    @dev same logic as the function in V1
    */
    function fund(PairUints[] calldata rewards) external virtual override onlyGovernance {
        // Once the program is over, it cannot be extended
        require(getCurrentEpochId() <= numberOfEpochs, "LAST_EPOCH_OVER");

        uint256 nNewEpochs = rewards.length;
        PairUints memory totalFunded;
        // all the funding will be used for new epochs
        for (uint256 i = 0; i < nNewEpochs; i++) {
            totalFunded = totalFunded.add(rewards[i]);
            epochData[numberOfEpochs + i + 1].totalRewards = rewards[i];
        }

        numberOfEpochs = numberOfEpochs.add(nNewEpochs);
        rewardTokens.safeTransferFrom(msg.sender, rewardTokensHolder, totalFunded);
        emit Funded(rewards, numberOfEpochs);
    }

    /**
    @notice top up rewards of exisiting epochs
    @dev almost same logic as the function in V1 without the redundant isFunded check
    */
    function topUpRewards(uint256[] calldata epochIds, PairUints[] calldata rewards)
        external
        virtual
        override
        onlyGovernance
    {
        require(epochIds.length == rewards.length, "INVALID_ARRAYS");

        uint256 curEpoch = getCurrentEpochId();
        uint256 endEpoch = numberOfEpochs;
        PairUints memory totalTopUp;

        for (uint256 i = 0; i < epochIds.length; i++) {
            require(curEpoch < epochIds[i] && epochIds[i] <= endEpoch, "INVALID_EPOCH_ID");
            totalTopUp = totalTopUp.add(rewards[i]);
            epochData[epochIds[i]].totalRewards = epochData[epochIds[i]].totalRewards.add(
                rewards[i]
            );
        }

        rewardTokens.safeTransferFrom(msg.sender, rewardTokensHolder, totalTopUp);
        emit RewardsToppedUp(epochIds, rewards);
    }

    /**
    @notice stake tokens in to receive rewards. It's allowed to stake for others
    @param forAddr the address to stake for
    @dev all staking data will be updated for `forAddr`, but msg.sender will be the one transferring
    tokens in
     */
    function stake(address forAddr, uint256 amount)
        external
        virtual
        override
        nonReentrant
        nonContractOrWhitelisted
        isUserAllowedToUse
    {
        require(forAddr != address(0), "ZERO_ADDRESS");
        require(amount != 0, "ZERO_AMOUNT");
        require(getCurrentEpochId() <= numberOfEpochs, "INCENTIVES_PERIOD_OVER");

        _settleStake(forAddr, msg.sender, amount);
        emit Staked(forAddr, amount);
    }

    /**
    @notice withdraw tokens from the staking contract. It's allowed to withdraw to an address
    different from msg.sender
    @param toAddr the address to receive all tokens
    @dev all staking data will be updated for msg.sender, but `toAddr` will be the one receiving
    all tokens
    */
    function withdraw(address toAddr, uint256 amount)
        external
        virtual
        override
        nonReentrant
        isUserAllowedToUse
    {
        require(amount != 0, "ZERO_AMOUNT");
        require(toAddr != address(0), "ZERO_ADDRESS");

        _settleWithdraw(msg.sender, toAddr, amount);
        emit Withdrawn(msg.sender, amount);
    }

    /**
    @notice redeem all available rewards from expired epochs. It's allowed to redeem for others
    @param user the address whose data will be updated & receive rewards
    */
    function redeemRewards(address user)
        external
        virtual
        override
        nonReentrant
        isUserAllowedToUse
        returns (PairUints memory rewards)
    {
        require(user != address(0), "ZERO_ADDRESS");

        rewards = _beforeTransferPendingRewards(user);
        rewardTokens.safeTransferFrom(rewardTokensHolder, user, rewards);
    }

    /**
    @notice redeem all due interests. It's allowed to redeem for others
    @param user the address whose data will be updated & receive due interests
    */
    function redeemDueInterests(address user)
        external
        virtual
        override
        nonReentrant
        isUserAllowedToUse
        returns (PairUints memory amountOut)
    {
        if (yieldTokens.allZero()) return amountOut;
        require(user != address(0), "ZERO_ADDRESS");

        amountOut = _beforeTransferDueInterests(user);
        amountOut = _pushYieldToken(user, amountOut);
    }

    function updateAndReadEpochData(uint256 epochId, address user)
        external
        override
        nonReentrant
        isUserAllowedToUse
        returns (
            uint256 totalStakeUnits,
            PairUints memory totalRewards,
            uint256 lastUpdated,
            uint256 stakeUnitsForUser,
            PairUints memory availableRewardsForUser
        )
    {
        _updatePendingRewards(user);
        return readEpochData(epochId, user);
    }

    function readYieldTokens() external view override returns (PairTokens memory tokens) {
        tokens = yieldTokens;
    }

    function readRewardTokens() external view override returns (PairTokens memory tokens) {
        tokens = rewardTokens;
    }

    function readEpochData(uint256 epochId, address user)
        public
        view
        override
        returns (
            uint256 totalStakeUnits,
            PairUints memory totalRewards,
            uint256 lastUpdated,
            uint256 stakeUnitsForUser,
            PairUints memory availableRewardsForUser
        )
    {
        totalStakeUnits = epochData[epochId].totalStakeUnits;
        totalRewards = epochData[epochId].totalRewards;
        lastUpdated = epochData[epochId].lastUpdated;
        stakeUnitsForUser = epochData[epochId].stakeUnitsForUser[user];
        availableRewardsForUser = epochData[epochId].availableRewardsForUser[user];
    }

    function getCurrentEpochId() public view returns (uint256) {
        return _epochOfTimestamp(block.timestamp);
    }

    /**
    @notice update all reward-related data for user
    @dev to be called before user's stakeToken balance changes
    @dev same logic as the function in V1
    */
    function _updatePendingRewards(address user) internal virtual {
        _updateStakeData();

        // user has not staked before, no need to do anything
        if (lastTimeUserStakeUpdated[user] == 0) {
            lastTimeUserStakeUpdated[user] = block.timestamp;
            return;
        }

        uint256 _curEpoch = getCurrentEpochId();
        uint256 _endEpoch = Math.min(numberOfEpochs, _curEpoch);

        // if _curEpoch<=numberOfEpochs => the endEpoch hasn't ended yet (since endEpoch=curEpoch)
        bool _isEndEpochOver = (_curEpoch > numberOfEpochs);

        // caching
        uint256 _balance = balances[user];
        uint256 _lastTimeUserStakeUpdated = lastTimeUserStakeUpdated[user];
        uint256 _totalStake = totalStake;
        uint256 _startEpoch = _epochOfTimestamp(_lastTimeUserStakeUpdated);

        // Go through all epochs until now to update stakeUnitsForUser and availableRewardsForEpoch
        for (uint256 epochId = _startEpoch; epochId <= _endEpoch; epochId++) {
            if (epochData[epochId].totalStakeUnits == 0) {
                // in the extreme case of zero staked tokens for this expiry even now,
                // => nothing to do from this epoch onwards
                if (_totalStake == 0) break;
                // nobody stakes anything in this epoch
                continue;
            }
            // updating stakeUnits for users. The logic of this is similar to _updateStakeDataForExpiry
            epochData[epochId].stakeUnitsForUser[user] = epochData[epochId]
                .stakeUnitsForUser[user]
                .add(_calcUnitsStakeInEpoch(_balance, _lastTimeUserStakeUpdated, epochId));

            // all epochs prior to the endEpoch must have ended
            // if epochId == _endEpoch, we must check if the epoch has ended or not
            if (epochId == _endEpoch && !_isEndEpochOver) {
                break;
            }

            // Now this epoch has ended,let's distribute its reward to this user
            // calc the amount of rewards the user is eligible to receive from this epoch
            PairUints memory rewardsPerVestingEpoch = _calcAmountRewardsForUserInEpoch(
                user,
                epochId
            );

            // Now we distribute this rewards over the vestingEpochs starting from epochId + 1
            // to epochId + vestingEpochs
            for (uint256 i = epochId + 1; i <= epochId + vestingEpochs; i++) {
                epochData[i].availableRewardsForUser[user] = epochData[i]
                    .availableRewardsForUser[user]
                    .add(rewardsPerVestingEpoch);
            }
        }

        lastTimeUserStakeUpdated[user] = block.timestamp;
    }

    /**
    @notice update staking data for the current epoch
    @dev same logic as the function in V1
    */
    function _updateStakeData() internal virtual {
        uint256 _curEpoch = getCurrentEpochId();

        // loop through all epochData in descending order
        for (uint256 i = Math.min(_curEpoch, numberOfEpochs); i > 0; i--) {
            uint256 epochEndTime = _endTimeOfEpoch(i);
            uint256 lastUpdatedForEpoch = epochData[i].lastUpdated;

            if (lastUpdatedForEpoch == epochEndTime) {
                break; // its already updated until this epoch, our job here is done
            }

            // if the epoch hasn't been fully updated yet, we will update it
            // just add the amount of units contributed by users since lastUpdatedForEpoch -> now
            // by calling _calcUnitsStakeInEpoch
            epochData[i].totalStakeUnits = epochData[i].totalStakeUnits.add(
                _calcUnitsStakeInEpoch(totalStake, lastUpdatedForEpoch, i)
            );
            // If the epoch has ended, lastUpdated = epochEndTime
            // If not yet, lastUpdated = block.timestamp (aka now)
            epochData[i].lastUpdated = Math.min(block.timestamp, epochEndTime);
        }
    }

    /**
    @notice update all interest-related data for user
    @dev to be called before user's stakeToken balance changes or when user wants to update his
    interests
    @dev same logic as the function in CompoundLiquidityMiningV1
    */
    function _updateDueInterests(address user) internal virtual {
        if (yieldTokens.allZero()) return;

        _updateParamL();

        if (lastParamL[user].allZero()) {
            lastParamL[user] = paramL;
            return;
        }

        uint256 principal = balances[user];
        PairUints memory interestValuePerStakeToken = paramL.sub(lastParamL[user]);

        PairUints memory interestFromStakeToken = interestValuePerStakeToken.mul(principal).div(
            MULTIPLIER
        );

        dueInterests[user] = dueInterests[user].add(interestFromStakeToken);
        lastParamL[user] = paramL;
    }

    /**
    @notice update paramL, lastNYield & redeem interest from external sources
    @dev to be called only from _updateDueInterests
    @dev same logic as the function in V1
    */
    function _updateParamL() internal virtual {
        if (yieldTokens.allZero() || !_checkNeedUpdateParamL()) return;

        _redeemExternalInterests();

        PairUints memory currentNYield = yieldTokens.balanceOf(address(this));
        (PairUints memory firstTerm, PairUints memory paramR) = _getFirstTermAndParamR(
            currentNYield
        );

        PairUints memory secondTerm;

        if (totalStake != 0) secondTerm = paramR.mul(MULTIPLIER).div(totalStake);

        // Update new states
        paramL = firstTerm.add(secondTerm);
        lastNYield = currentNYield;
    }

    /**
    @dev same logic as the function in CompoundLiquidityMining
    @dev to be called only from _updateParamL
    */
    function _getFirstTermAndParamR(PairUints memory currentNYield)
        internal
        virtual
        returns (PairUints memory firstTerm, PairUints memory paramR)
    {
        firstTerm = paramL;
        paramR = currentNYield.sub(lastNYield);
    }

    /**
    @dev function is empty because by default yieldTokens==0
    */
    function _checkNeedUpdateParamL() internal virtual returns (bool) {}

    /**
    @dev function is empty because by default yieldTokens==0
    */
    function _redeemExternalInterests() internal virtual {}

    /**
    @notice Calc the amount of rewards that the user can receive now & clear all the pending
    rewards
    @dev To be called before any rewards is transferred out
    @dev same logic as the function in V1
    */
    function _beforeTransferPendingRewards(address user)
        internal
        virtual
        returns (PairUints memory amountOut)
    {
        _updatePendingRewards(user);

        uint256 _lastEpoch = Math.min(getCurrentEpochId(), numberOfEpochs + vestingEpochs);
        for (uint256 i = lastEpochClaimed[user]; i <= _lastEpoch; i++) {
            if (!epochData[i].availableRewardsForUser[user].allZero()) {
                amountOut = amountOut.add(epochData[i].availableRewardsForUser[user]);
                epochData[i].availableRewardsForUser[user] = PairUints(0, 0);
            }
        }

        lastEpochClaimed[user] = _lastEpoch;
        emit PendleRewardsSettled(user, amountOut);
    }

    /**
    @notice Calc the amount of interests that the user can receive now & clear all the due
    interests
    @dev To be called before any interests is transferred out
    @dev same logic as the function in V1
    */
    function _beforeTransferDueInterests(address user)
        internal
        virtual
        returns (PairUints memory amountOut)
    {
        if (yieldTokens.allZero()) return amountOut;

        _updateDueInterests(user);
        amountOut = dueInterests[user].min(lastNYield);
        dueInterests[user] = PairUints(0, 0);
        lastNYield = lastNYield.sub(amountOut);
    }

    /**
    @param user the address whose all stake data will be updated
    @param payer the address which tokens will be pulled from
    @param amount amount of tokens to be staked
    @dev payer is only used to pass to _pullStakeToken
     */
    function _settleStake(
        address user,
        address payer,
        uint256 amount
    ) internal virtual {
        _updatePendingRewards(user);
        _updateDueInterests(user);

        balances[user] = balances[user].add(amount);
        totalStake = totalStake.add(amount);

        _pullStakeToken(payer, amount);
    }

    /**
    @param user the address whose all stake data will be updated
    @param receiver the address which tokens will be pushed to
    @param amount amount of tokens to be withdrawn
    @dev receiver is only used to pass to _pullStakeToken
     */
    function _settleWithdraw(
        address user,
        address receiver,
        uint256 amount
    ) internal virtual {
        _updatePendingRewards(user);
        _updateDueInterests(user);

        balances[user] = balances[user].sub(amount);
        totalStake = totalStake.sub(amount);

        _pushStakeToken(receiver, amount);
    }

    function _pullStakeToken(address from, uint256 amount) internal virtual {
        // For the case that we don't need to stake the stakeToken anywhere else, just pull it
        // into the current contract
        IERC20(stakeToken).safeTransferFrom(from, address(this), amount);
    }

    function _pushStakeToken(address to, uint256 amount) internal virtual {
        // For the case that we don't need to stake the stakeToken anywhere else, just transfer out
        // from the current contract
        if (amount != 0) IERC20(stakeToken).safeTransfer(to, amount);
    }

    function _pushYieldToken(address to, PairUints memory amount)
        internal
        virtual
        returns (PairUints memory outAmount)
    {
        outAmount = amount.min(yieldTokens.balanceOf(address(this)));
        yieldTokens.safeTransfer(to, outAmount);
    }

    /**
     @notice returns the stakeUnits in the _epochId(th) epoch of an user if he stake from _startTime to now
     @dev to calculate durationStakeThisEpoch:
       user will stake from _startTime -> _endTime, while the epoch last from _startTimeOfEpoch -> _endTimeOfEpoch
       => the stakeDuration of user will be min(_endTime,_endTimeOfEpoch) - max(_startTime,_startTimeOfEpoch)
     @dev same logic as in V1
     */
    function _calcUnitsStakeInEpoch(
        uint256 _tokenAmount,
        uint256 _startTime,
        uint256 _epochId
    ) internal view returns (uint256 stakeUnitsForUser) {
        uint256 _endTime = block.timestamp;

        uint256 _l = Math.max(_startTime, _startTimeOfEpoch(_epochId));
        uint256 _r = Math.min(_endTime, _endTimeOfEpoch(_epochId));
        uint256 durationStakeThisEpoch = _r.subMax0(_l);

        return _tokenAmount.mul(durationStakeThisEpoch);
    }

    /**
    @notice calc the amount of rewards the user is eligible to receive from this epoch, but we will
    return the amount per vestingEpoch instead
    @dev same logic as in V1
     */
    function _calcAmountRewardsForUserInEpoch(address user, uint256 epochId)
        internal
        view
        returns (PairUints memory rewardsPerVestingEpoch)
    {
        rewardsPerVestingEpoch = epochData[epochId]
            .totalRewards
            .mul(epochData[epochId].stakeUnitsForUser[user])
            .div(epochData[epochId].totalStakeUnits)
            .div(vestingEpochs);
    }

    function _startTimeOfEpoch(uint256 t) internal view returns (uint256) {
        // epoch id starting from 1
        return startTime.add((t.sub(1)).mul(epochDuration));
    }

    function _epochOfTimestamp(uint256 t) internal view returns (uint256) {
        if (t < startTime) return 0;
        return (t.sub(startTime)).div(epochDuration).add(1);
    }

    // Although the name of this function is endTimeOfEpoch, it's actually the beginning of the next epoch
    function _endTimeOfEpoch(uint256 t) internal view returns (uint256) {
        // epoch id starting from 1
        return startTime.add(t.mul(epochDuration));
    }

    function _allowedToWithdraw(address _token) internal view override returns (bool allowed) {
        allowed =
            (rewardTokens.contains(_token) == false) &&
            stakeToken != _token &&
            (yieldTokens.contains(_token) == false);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 () internal {
        _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 make 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;
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import "./PermissionsV2.sol";

abstract contract WithdrawableV2 is PermissionsV2 {
    using SafeERC20 for IERC20;

    event EtherWithdraw(uint256 amount, address sendTo);
    event TokenWithdraw(IERC20 token, uint256 amount, address sendTo);

    /**
     * @dev Allows governance to withdraw Ether in a Pendle contract
     *      in case of accidental ETH transfer into the contract.
     * @param amount The amount of Ether to withdraw.
     * @param sendTo The recipient address.
     */
    function withdrawEther(uint256 amount, address payable sendTo) external onlyGovernance {
        (bool success, ) = sendTo.call{value: amount}("");
        require(success, "WITHDRAW_FAILED");
        emit EtherWithdraw(amount, sendTo);
    }

    /**
     * @dev Allows governance to withdraw all IERC20 compatible tokens in a Pendle
     *      contract in case of accidental token transfer into the contract.
     * @param token IERC20 The address of the token contract.
     * @param amount The amount of IERC20 tokens to withdraw.
     * @param sendTo The recipient address.
     */
    function withdrawToken(
        IERC20 token,
        uint256 amount,
        address sendTo
    ) external onlyGovernance {
        require(_allowedToWithdraw(address(token)), "TOKEN_NOT_ALLOWED");
        token.safeTransfer(sendTo, amount);
        emit TokenWithdraw(token, amount, sendTo);
    }

    // must be overridden by the sub contracts, so we must consider explicitly
    // in each and every contract which tokens are allowed to be withdrawn
    function _allowedToWithdraw(address) internal view virtual returns (bool allowed);
}

// SPDX-License-Identifier: MIT
/*
 * MIT License
 * ===========
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 */

pragma solidity 0.7.6;
pragma abicoder v2;

import "../libraries/PairTokensLib.sol";
import "../interfaces/IWETH.sol";

interface IPendleLiquidityMiningV2Multi {
    event Funded(PairUints[] rewards, uint256 numberOfEpochs);
    event RewardsToppedUp(uint256[] epochIds, PairUints[] rewards);
    event Staked(address user, uint256 amount);
    event Withdrawn(address user, uint256 amount);
    event PendleRewardsSettled(address user, PairUints amount);

    function fund(PairUints[] calldata rewards) external;

    function topUpRewards(uint256[] calldata epochIds, PairUints[] calldata rewards) external;

    function stake(address forAddr, uint256 amount) external;

    function withdraw(address toAddr, uint256 amount) external;

    function redeemRewards(address user) external returns (PairUints memory rewards);

    function redeemDueInterests(address user) external returns (PairUints memory amountOut);

    function setUpEmergencyMode(address spender, bool) external;

    function updateAndReadEpochData(uint256 epochId, address user)
        external
        returns (
            uint256 totalStakeUnits,
            PairUints memory totalRewards,
            uint256 lastUpdated,
            uint256 stakeUnitsForUser,
            PairUints memory availableRewardsForUser
        );

    function balances(address user) external view returns (uint256);

    function startTime() external view returns (uint256);

    function epochDuration() external view returns (uint256);

    function readEpochData(uint256 epochId, address user)
        external
        view
        returns (
            uint256 totalStakeUnits,
            PairUints memory totalRewards,
            uint256 lastUpdated,
            uint256 stakeUnitsForUser,
            PairUints memory availableRewardsForUser
        );

    function numberOfEpochs() external view returns (uint256);

    function vestingEpochs() external view returns (uint256);

    function stakeToken() external view returns (address);

    function totalStake() external view returns (uint256);

    function readYieldTokens() external view returns (PairTokens memory);

    function readRewardTokens() external view returns (PairTokens memory);
}

// SPDX-License-Identifier: MIT
/*
 * MIT License
 * ===========
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 */
pragma solidity 0.7.6;

interface IPendlePausingManager {
    event AddPausingAdmin(address admin);
    event RemovePausingAdmin(address admin);
    event PendingForgeEmergencyHandler(address _pendingForgeHandler);
    event PendingMarketEmergencyHandler(address _pendingMarketHandler);
    event PendingLiqMiningEmergencyHandler(address _pendingLiqMiningHandler);
    event ForgeEmergencyHandlerSet(address forgeEmergencyHandler);
    event MarketEmergencyHandlerSet(address marketEmergencyHandler);
    event LiqMiningEmergencyHandlerSet(address liqMiningEmergencyHandler);

    event PausingManagerLocked();
    event ForgeHandlerLocked();
    event MarketHandlerLocked();
    event LiqMiningHandlerLocked();

    event SetForgePaused(bytes32 forgeId, bool settingToPaused);
    event SetForgeAssetPaused(bytes32 forgeId, address underlyingAsset, bool settingToPaused);
    event SetForgeAssetExpiryPaused(
        bytes32 forgeId,
        address underlyingAsset,
        uint256 expiry,
        bool settingToPaused
    );

    event SetForgeLocked(bytes32 forgeId);
    event SetForgeAssetLocked(bytes32 forgeId, address underlyingAsset);
    event SetForgeAssetExpiryLocked(bytes32 forgeId, address underlyingAsset, uint256 expiry);

    event SetMarketFactoryPaused(bytes32 marketFactoryId, bool settingToPaused);
    event SetMarketPaused(bytes32 marketFactoryId, address market, bool settingToPaused);

    event SetMarketFactoryLocked(bytes32 marketFactoryId);
    event SetMarketLocked(bytes32 marketFactoryId, address market);

    event SetLiqMiningPaused(address liqMiningContract, bool settingToPaused);
    event SetLiqMiningLocked(address liqMiningContract);

    function forgeEmergencyHandler()
        external
        view
        returns (
            address handler,
            address pendingHandler,
            uint256 timelockDeadline
        );

    function marketEmergencyHandler()
        external
        view
        returns (
            address handler,
            address pendingHandler,
            uint256 timelockDeadline
        );

    function liqMiningEmergencyHandler()
        external
        view
        returns (
            address handler,
            address pendingHandler,
            uint256 timelockDeadline
        );

    function permLocked() external view returns (bool);

    function permForgeHandlerLocked() external view returns (bool);

    function permMarketHandlerLocked() external view returns (bool);

    function permLiqMiningHandlerLocked() external view returns (bool);

    function isPausingAdmin(address) external view returns (bool);

    function setPausingAdmin(address admin, bool isAdmin) external;

    function requestForgeHandlerChange(address _pendingForgeHandler) external;

    function requestMarketHandlerChange(address _pendingMarketHandler) external;

    function requestLiqMiningHandlerChange(address _pendingLiqMiningHandler) external;

    function applyForgeHandlerChange() external;

    function applyMarketHandlerChange() external;

    function applyLiqMiningHandlerChange() external;

    function lockPausingManagerPermanently() external;

    function lockForgeHandlerPermanently() external;

    function lockMarketHandlerPermanently() external;

    function lockLiqMiningHandlerPermanently() external;

    function setForgePaused(bytes32 forgeId, bool paused) external;

    function setForgeAssetPaused(
        bytes32 forgeId,
        address underlyingAsset,
        bool paused
    ) external;

    function setForgeAssetExpiryPaused(
        bytes32 forgeId,
        address underlyingAsset,
        uint256 expiry,
        bool paused
    ) external;

    function setForgeLocked(bytes32 forgeId) external;

    function setForgeAssetLocked(bytes32 forgeId, address underlyingAsset) external;

    function setForgeAssetExpiryLocked(
        bytes32 forgeId,
        address underlyingAsset,
        uint256 expiry
    ) external;

    function checkYieldContractStatus(
        bytes32 forgeId,
        address underlyingAsset,
        uint256 expiry
    ) external returns (bool _paused, bool _locked);

    function setMarketFactoryPaused(bytes32 marketFactoryId, bool paused) external;

    function setMarketPaused(
        bytes32 marketFactoryId,
        address market,
        bool paused
    ) external;

    function setMarketFactoryLocked(bytes32 marketFactoryId) external;

    function setMarketLocked(bytes32 marketFactoryId, address market) external;

    function checkMarketStatus(bytes32 marketFactoryId, address market)
        external
        returns (bool _paused, bool _locked);

    function setLiqMiningPaused(address liqMiningContract, bool settingToPaused) external;

    function setLiqMiningLocked(address liqMiningContract) external;

    function checkLiqMiningStatus(address liqMiningContract)
        external
        returns (bool _paused, bool _locked);
}

// SPDX-License-Identifier: MIT
/*
 * MIT License
 * ===========
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 */
pragma solidity 0.7.6;

interface IPendleWhitelist {
    event AddedToWhiteList(address);
    event RemovedFromWhiteList(address);

    function whitelisted(address) external view returns (bool);

    function addToWhitelist(address[] calldata _addresses) external;

    function removeFromWhitelist(address[] calldata _addresses) external;

    function getWhitelist() external view returns (address[] memory list);
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity ^0.7.0;
pragma abicoder v2;

import "@openzeppelin/contracts/math/SafeMath.sol";

library Math {
    using SafeMath for uint256;

    uint256 internal constant BIG_NUMBER = (uint256(1) << uint256(200));
    uint256 internal constant PRECISION_BITS = 40;
    uint256 internal constant RONE = uint256(1) << PRECISION_BITS;
    uint256 internal constant PI = (314 * RONE) / 10**2;
    uint256 internal constant PI_PLUSONE = (414 * RONE) / 10**2;
    uint256 internal constant PRECISION_POW = 1e2;

    function checkMultOverflow(uint256 _x, uint256 _y) internal pure returns (bool) {
        if (_y == 0) return false;
        return (((_x * _y) / _y) != _x);
    }

    /**
    @notice find the integer part of log2(p/q)
        => find largest x s.t p >= q * 2^x
        => find largest x s.t 2^x <= p / q
     */
    function log2Int(uint256 _p, uint256 _q) internal pure returns (uint256) {
        uint256 res = 0;
        uint256 remain = _p / _q;
        while (remain > 0) {
            res++;
            remain /= 2;
        }
        return res - 1;
    }

    /**
    @notice log2 for a number that it in [1,2)
    @dev _x is FP, return a FP
    @dev function is from Kyber. Long modified the condition to be (_x >= one) && (_x < two)
    to avoid the case where x = 2 may lead to incorrect result
     */
    function log2ForSmallNumber(uint256 _x) internal pure returns (uint256) {
        uint256 res = 0;
        uint256 one = (uint256(1) << PRECISION_BITS);
        uint256 two = 2 * one;
        uint256 addition = one;

        require((_x >= one) && (_x < two), "MATH_ERROR");
        require(PRECISION_BITS < 125, "MATH_ERROR");

        for (uint256 i = PRECISION_BITS; i > 0; i--) {
            _x = (_x * _x) / one;
            addition = addition / 2;
            if (_x >= two) {
                _x = _x / 2;
                res += addition;
            }
        }

        return res;
    }

    /**
    @notice log2 of (p/q). returns result in FP form
    @dev function is from Kyber.
    @dev _p & _q is FP, return a FP
     */
    function logBase2(uint256 _p, uint256 _q) internal pure returns (uint256) {
        uint256 n = 0;

        if (_p > _q) {
            n = log2Int(_p, _q);
        }

        require(n * RONE <= BIG_NUMBER, "MATH_ERROR");
        require(!checkMultOverflow(_p, RONE), "MATH_ERROR");
        require(!checkMultOverflow(n, RONE), "MATH_ERROR");
        require(!checkMultOverflow(uint256(1) << n, _q), "MATH_ERROR");

        uint256 y = (_p * RONE) / (_q * (uint256(1) << n));
        uint256 log2Small = log2ForSmallNumber(y);

        assert(log2Small <= BIG_NUMBER);

        return n * RONE + log2Small;
    }

    /**
    @notice calculate ln(p/q). returned result >= 0
    @dev function is from Kyber.
    @dev _p & _q is FP, return a FP
    */
    function ln(uint256 p, uint256 q) internal pure returns (uint256) {
        uint256 ln2Numerator = 6931471805599453094172;
        uint256 ln2Denomerator = 10000000000000000000000;

        uint256 log2x = logBase2(p, q);

        require(!checkMultOverflow(ln2Numerator, log2x), "MATH_ERROR");

        return (ln2Numerator * log2x) / ln2Denomerator;
    }

    /**
    @notice extract the fractional part of a FP
    @dev value is a FP, return a FP
     */
    function fpart(uint256 value) internal pure returns (uint256) {
        return value % RONE;
    }

    /**
    @notice convert a FP to an Int
    @dev value is a FP, return an Int
     */
    function toInt(uint256 value) internal pure returns (uint256) {
        return value / RONE;
    }

    /**
    @notice convert an Int to a FP
    @dev value is an Int, return a FP
     */
    function toFP(uint256 value) internal pure returns (uint256) {
        return value * RONE;
    }

    /**
    @notice return e^exp in FP form
    @dev estimation by formula at http://pages.mtu.edu/~shene/COURSES/cs201/NOTES/chap04/exp.html
        the function is based on exp function of:
        https://github.com/NovakDistributed/macroverse/blob/master/contracts/RealMath.sol
    @dev the function is expected to converge quite fast, after about 20 iteration
    @dev exp is a FP, return a FP
     */
    function rpowe(uint256 exp) internal pure returns (uint256) {
        uint256 res = 0;

        uint256 curTerm = RONE;

        for (uint256 n = 0; ; n++) {
            res += curTerm;
            curTerm = rmul(curTerm, rdiv(exp, toFP(n + 1)));
            if (curTerm == 0) {
                break;
            }
            if (n == 500) {
                /*
                testing shows that in the most extreme case, it will take 430 turns to converge.
                however, it's expected that the numbers will not exceed 2^120 in normal situation
                the most extreme case is rpow((1<<256)-1,(1<<40)-1) (equal to rpow((2^256-1)/2^40,0.99..9))
                */
                revert("RPOWE_SLOW_CONVERGE");
            }
        }

        return res;
    }

    /**
    @notice calculate base^exp with base and exp being FP int
    @dev to improve accuracy, base^exp = base^(int(exp)+frac(exp))
                                       = base^int(exp) * base^frac
    @dev base & exp are FP, return a FP
     */
    function rpow(uint256 base, uint256 exp) internal pure returns (uint256) {
        if (exp == 0) {
            // Anything to the 0 is 1
            return RONE;
        }
        if (base == 0) {
            // 0 to anything except 0 is 0
            return 0;
        }

        uint256 frac = fpart(exp); // get the fractional part
        uint256 whole = exp - frac;

        uint256 wholePow = rpowi(base, toInt(whole)); // whole is a FP, convert to Int
        uint256 fracPow;

        // instead of calculating base ^ frac, we will calculate e ^ (frac*ln(base))
        if (base < RONE) {
            /* since the base is smaller than 1.0, ln(base) < 0.
            Since 1 / (e^(frac*ln(1/base))) = e ^ (frac*ln(base)),
            we will calculate 1 / (e^(frac*ln(1/base))) instead.
            */
            uint256 newExp = rmul(frac, ln(rdiv(RONE, base), RONE));
            fracPow = rdiv(RONE, rpowe(newExp));
        } else {
            /* base is greater than 1, calculate normally */
            uint256 newExp = rmul(frac, ln(base, RONE));
            fracPow = rpowe(newExp);
        }
        return rmul(wholePow, fracPow);
    }

    /**
    @notice return base^exp with base in FP form and exp in Int
    @dev this function use a technique called: exponentiating by squaring
        complexity O(log(q))
    @dev function is from Kyber.
    @dev base is a FP, exp is an Int, return a FP
     */
    function rpowi(uint256 base, uint256 exp) internal pure returns (uint256) {
        uint256 res = exp % 2 != 0 ? base : RONE;

        for (exp /= 2; exp != 0; exp /= 2) {
            base = rmul(base, base);

            if (exp % 2 != 0) {
                res = rmul(res, base);
            }
        }
        return res;
    }

    /**
    @dev y is an Int, returns an Int
    @dev babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    @dev from Uniswap
     */
    function sqrt(uint256 y) internal pure returns (uint256 z) {
        if (y > 3) {
            z = y;
            uint256 x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }

    /**
    @notice divide 2 FP, return a FP
    @dev function is from Balancer.
    @dev x & y are FP, return a FP
     */
    function rdiv(uint256 x, uint256 y) internal pure returns (uint256) {
        return (y / 2).add(x.mul(RONE)).div(y);
    }

    /**
    @notice multiply 2 FP, return a FP
    @dev function is from Balancer.
    @dev x & y are FP, return a FP
     */
    function rmul(uint256 x, uint256 y) internal pure returns (uint256) {
        return (RONE / 2).add(x.mul(y)).div(RONE);
    }

    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    function subMax0(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a - b : 0;
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later
pragma solidity ^0.7.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";

library TokenUtils {
    using SafeERC20 for IERC20;

    function requireERC20(address tokenAddr) internal view {
        require(IERC20(tokenAddr).totalSupply() > 0, "INVALID_ERC20");
    }

    function requireERC20(IERC20 token) internal view {
        require(token.totalSupply() > 0, "INVALID_ERC20");
    }

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        token.safeTransfer(to, value);
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        token.safeTransferFrom(from, to, value);
    }

    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        token.approve(spender, 0);
        token.approve(spender, value);
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../libraries/TokenUtilsLib.sol";

contract PendleSimpleERC20TokenHolder {
    using TokenUtils for IERC20;

    constructor(address[] memory tokens, address spender) {
        for (uint256 i = 0; i < tokens.length; i++) {
            if (tokens[i] == address(0)) continue;
            IERC20(tokens[i]).safeApprove(spender, type(uint256).max);
        }
    }

    receive() external payable {
        revert("ETH_NOT_ALLOWED");
    }
}

// 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);
}

// 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");
        }
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "../core/PendleGovernanceManager.sol";
import "../interfaces/IPermissionsV2.sol";

abstract contract PermissionsV2 is IPermissionsV2 {
    PendleGovernanceManager public immutable override governanceManager;
    address internal initializer;

    constructor(address _governanceManager) {
        require(_governanceManager != address(0), "ZERO_ADDRESS");
        initializer = msg.sender;
        governanceManager = PendleGovernanceManager(_governanceManager);
    }

    modifier initialized() {
        require(initializer == address(0), "NOT_INITIALIZED");
        _;
    }

    modifier onlyGovernance() {
        require(msg.sender == _governance(), "ONLY_GOVERNANCE");
        _;
    }

    function _governance() internal view returns (address) {
        return governanceManager.governance();
    }
}

// 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, 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;
    }
}

// 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);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(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);
            }
        }
    }
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;

contract PendleGovernanceManager {
    address public governance;
    address public pendingGovernance;

    event GovernanceClaimed(address newGovernance, address previousGovernance);

    event TransferGovernancePending(address pendingGovernance);

    constructor(address _governance) {
        require(_governance != address(0), "ZERO_ADDRESS");
        governance = _governance;
    }

    modifier onlyGovernance() {
        require(msg.sender == governance, "ONLY_GOVERNANCE");
        _;
    }

    /**
     * @dev Allows the pendingGovernance address to finalize the change governance process.
     */
    function claimGovernance() external {
        require(pendingGovernance == msg.sender, "WRONG_GOVERNANCE");
        emit GovernanceClaimed(pendingGovernance, governance);
        governance = pendingGovernance;
        pendingGovernance = address(0);
    }

    /**
     * @dev Allows the current governance to set the pendingGovernance address.
     * @param _governance The address to transfer ownership to.
     */
    function transferGovernance(address _governance) external onlyGovernance {
        require(_governance != address(0), "ZERO_ADDRESS");
        pendingGovernance = _governance;

        emit TransferGovernancePending(pendingGovernance);
    }
}

// SPDX-License-Identifier: MIT
/*
 * MIT License
 * ===========
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 */

pragma solidity 0.7.6;
pragma abicoder v2;

import "../core/PendleGovernanceManager.sol";

interface IPermissionsV2 {
    function governanceManager() external returns (PendleGovernanceManager);
}

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.7.6;
pragma abicoder v2;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "./MathLib.sol";
import "./TokenUtilsLib.sol";

struct PairUints {
    uint256 uintA;
    uint256 uintB;
}

struct PairTokens {
    address tokenA;
    address tokenB;
}

struct PairTokenUints {
    PairTokens tokens;
    PairUints uints;
}

library PairTokensLib {
    using SafeMath for uint256;
    using Math for uint256;
    using TokenUtils for IERC20;

    address internal constant ZERO = address(0);

    function verify(PairTokens memory a) internal pure {
        if (a.tokenA != ZERO) require(a.tokenA != a.tokenB, "DUPLICATED_TOKENS");
    }

    function safeTransferFrom(
        PairTokens memory tokens,
        address from,
        address to,
        PairUints memory amounts
    ) internal {
        if (tokens.tokenA != ZERO && amounts.uintA != 0)
            IERC20(tokens.tokenA).safeTransferFrom(from, to, amounts.uintA);
        if (tokens.tokenB != ZERO && amounts.uintB != 0)
            IERC20(tokens.tokenB).safeTransferFrom(from, to, amounts.uintB);
    }

    function safeTransfer(
        PairTokens memory tokens,
        address to,
        PairUints memory amounts
    ) internal {
        if (tokens.tokenA != ZERO && amounts.uintA != 0)
            IERC20(tokens.tokenA).safeTransfer(to, amounts.uintA);
        if (tokens.tokenB != ZERO && amounts.uintB != 0)
            IERC20(tokens.tokenB).safeTransfer(to, amounts.uintB);
    }

    function infinityApprove(PairTokens memory tokens, address to) internal {
        if (tokens.tokenA != ZERO) IERC20(tokens.tokenA).safeApprove(to, type(uint256).max);
        if (tokens.tokenB != ZERO) IERC20(tokens.tokenB).safeApprove(to, type(uint256).max);
    }

    function allowance(PairTokens memory tokens, address spender)
        internal
        view
        returns (PairUints memory res)
    {
        if (tokens.tokenA != ZERO)
            res.uintA = IERC20(tokens.tokenA).allowance(address(this), spender);
        if (tokens.tokenB != ZERO)
            res.uintB = IERC20(tokens.tokenB).allowance(address(this), spender);
    }

    function balanceOf(PairTokens memory tokens, address account)
        internal
        view
        returns (PairUints memory balances)
    {
        if (tokens.tokenA != ZERO) balances.uintA = IERC20(tokens.tokenA).balanceOf(account);
        if (tokens.tokenB != ZERO) balances.uintB = IERC20(tokens.tokenB).balanceOf(account);
    }

    function add(PairUints memory a, PairUints memory b)
        internal
        pure
        returns (PairUints memory res)
    {
        res.uintA = a.uintA.add(b.uintA);
        res.uintB = a.uintB.add(b.uintB);
    }

    function sub(PairUints memory a, PairUints memory b)
        internal
        pure
        returns (PairUints memory res)
    {
        res.uintA = a.uintA.sub(b.uintA);
        res.uintB = a.uintB.sub(b.uintB);
    }

    function eq(PairUints memory a, PairUints memory b) internal pure returns (bool) {
        return a.uintA == b.uintA && a.uintB == b.uintB;
    }

    function eq(PairTokens memory a, PairTokens memory b) internal pure returns (bool) {
        return a.tokenA == b.tokenA && a.tokenB == b.tokenB;
    }

    function min(PairUints memory a, PairUints memory b) internal pure returns (PairUints memory) {
        return PairUints(Math.min(a.uintA, b.uintA), Math.min(a.uintB, b.uintB));
    }

    function mul(PairUints memory a, uint256 b) internal pure returns (PairUints memory res) {
        res.uintA = a.uintA.mul(b);
        res.uintB = a.uintB.mul(b);
    }

    function div(PairUints memory a, uint256 b) internal pure returns (PairUints memory res) {
        res.uintA = a.uintA.div(b);
        res.uintB = a.uintB.div(b);
    }

    function allZero(PairUints memory a) internal pure returns (bool) {
        return a.uintA == 0 && a.uintB == 0;
    }

    function allZero(PairTokens memory a) internal pure returns (bool) {
        return a.tokenA == ZERO && a.tokenB == ZERO;
    }

    function contains(PairTokens memory tokens, address _token) internal pure returns (bool) {
        if (_token == ZERO) return false;
        return (_token == tokens.tokenA || _token == tokens.tokenB);
    }

    function toArr(PairTokens memory tokens) internal pure returns (address[] memory res) {
        res = new address[](2);
        res[0] = tokens.tokenA;
        res[1] = tokens.tokenB;
    }

    function add(PairTokenUints memory a, PairTokenUints memory b)
        internal
        pure
        returns (PairTokenUints memory res)
    {
        require(eq(a.tokens, b.tokens), "PAIR_MISMATCH");
        res.tokens = a.tokens;
        res.uints = add(a.uints, b.uints);
    }

    function mul(PairTokenUints memory a, uint256 b)
        internal
        pure
        returns (PairTokenUints memory res)
    {
        res.tokens = a.tokens;
        res.uints = mul(a.uints, b);
    }

    function div(PairTokenUints memory a, uint256 b)
        internal
        pure
        returns (PairTokenUints memory res)
    {
        res.tokens = a.tokens;
        res.uints = div(a.uints, b);
    }
}

// SPDX-License-Identifier: MIT
/*
 * MIT License
 * ===========
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 */
pragma solidity 0.7.6;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

interface IWETH is IERC20 {
    function deposit() external payable;

    function withdraw(uint256 wad) external;
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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PairUints","name":"amount","type":"tuple"}],"name":"PendleRewardsSettled","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256[]","name":"epochIds","type":"uint256[]"},{"components":[{"internalType":"uint256","name":"uintA","type":"uint256"},{"internalType":"uint256","name":"uintB","type":"uint256"}],"indexed":false,"internalType":"struct PairUints[]","name":"rewards","type":"tuple[]"}],"name":"RewardsToppedUp","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Staked","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"contract 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PairUints","name":"amountOut","type":"tuple"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"user","type":"address"}],"name":"redeemRewards","outputs":[{"components":[{"internalType":"uint256","name":"uintA","type":"uint256"},{"internalType":"uint256","name":"uintB","type":"uint256"}],"internalType":"struct PairUints","name":"rewards","type":"tuple"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rewardTokens","outputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardTokensHolder","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"bool","name":"","type":"bool"}],"name":"setUpEmergencyMode","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"forAddr","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"stakeToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"startTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"epochIds","type":"uint256[]"},{"components":[{"internalType":"uint256","name":"uintA","type":"uint256"},{"internalType":"uint256","name":"uintB","type":"uint256"}],"internalType":"struct PairUints[]","name":"rewards","type":"tuple[]"}],"name":"topUpRewards","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"totalStake","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"epochId","type":"uint256"},{"internalType":"address","name":"user","type":"address"}],"name":"updateAndReadEpochData","outputs":[{"internalType":"uint256","name":"totalStakeUnits","type":"uint256"},{"components":[{"internalType":"uint256","name":"uintA","type":"uint256"},{"internalType":"uint256","name":"uintB","type":"uint256"}],"internalType":"struct PairUints","name":"totalRewards","type":"tuple"},{"internalType":"uint256","name":"lastUpdated","type":"uint256"},{"internalType":"uint256","name":"stakeUnitsForUser","type":"uint256"},{"components":[{"internalType":"uint256","name":"uintA","type":"uint256"},{"internalType":"uint256","name":"uintB","type":"uint256"}],"internalType":"struct PairUints","name":"availableRewardsForUser","type":"tuple"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"vestingEpochs","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"weth","outputs":[{"internalType":"contract IWETH","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"whitelist","outputs":[{"internalType":"contract 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-----Decoded View---------------
Arg [0] : args (tuple): System.Collections.Generic.List`1[Nethereum.ABI.FunctionEncoding.ParameterOutput]

-----Encoded View---------------
12 Constructor Arguments found :
Arg [0] : 0000000000000000000000009e8b9ec2454bcab6128231d9fd405e864acd3cf9
Arg [1] : 000000000000000000000000d4016bd5ebf2a46c7923348ab47ef8531a6aab34
Arg [2] : 000000000000000000000000d5889758bb9a661482f9e2cced35ce1057081e64
Arg [3] : 000000000000000000000000fb98b335551a418cd0737375a2ea0ded62ea213b
Arg [4] : 000000000000000000000000b31f66aa3c1e785363f0875a1b74e27b85fd66c7
Arg [5] : 00000000000000000000000082922e6fbe83547c5e2e0229815942a2108e4624
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [7] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [8] : 00000000000000000000000000000000000000000000000000000000618d05c0
Arg [9] : 0000000000000000000000000000000000000000000000000000000000093a80
Arg [10] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [11] : 000000000000000000000000b31f66aa3c1e785363f0875a1b74e27b85fd66c7