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// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.7.6;

import "../interfaces/IMultiFeeDistribution.sol";
import "../dependencies/openzeppelin/contracts/Ownable.sol";
import "../dependencies/openzeppelin/contracts/SafeMath.sol";

contract MerkleDistributor is Ownable {
    using SafeMath for uint256;

    struct ClaimRecord {
        bytes32 merkleRoot;
        uint256 validUntil;
        uint256 total;
        uint256 claimed;
    }

    uint256 public immutable maxMintableTokens;
    uint256 public mintedTokens;
    uint256 public reservedTokens;
    uint256 public immutable startTime;
    uint256 public constant duration = 86400 * 365;
    uint256 public constant minDuration = 86400 * 7;

    IMultiFeeDistribution public rewardMinter;

    ClaimRecord[] public claims;

    event Claimed(
        address indexed account,
        uint256 indexed merkleIndex,
        uint256 index,
        uint256 amount,
        address receiver
    );

    // This is a packed array of booleans.
    mapping(uint256 => mapping(uint256 => uint256)) private claimedBitMap;

    constructor(IMultiFeeDistribution _rewardMinter, uint256 _maxMintable) Ownable() {
        rewardMinter = _rewardMinter;
        maxMintableTokens = _maxMintable;
        startTime = block.timestamp;
    }

    function mintableBalance() public view returns (uint256) {
        uint elapsedTime = block.timestamp.sub(startTime);
        if (elapsedTime > duration) elapsedTime = duration;
        return maxMintableTokens.mul(elapsedTime).div(duration).sub(mintedTokens).sub(reservedTokens);
    }

    function addClaimRecord(bytes32 _root, uint256 _duration, uint256 _total) external onlyOwner {
        require(_duration >= minDuration);
        uint mintable = mintableBalance();
        require(mintable >= _total);

        claims.push(ClaimRecord({
            merkleRoot: _root,
            validUntil: block.timestamp + _duration,
            total: _total,
            claimed: 0
        }));
        reservedTokens = reservedTokens.add(_total);

    }

    function releaseExpiredClaimReserves(uint256[] calldata _claimIndexes) external {
        for (uint256 i = 0; i < _claimIndexes.length; i++) {
            ClaimRecord storage c = claims[_claimIndexes[i]];
            require(block.timestamp > c.validUntil, 'MerkleDistributor: Drop still active.');
            reservedTokens = reservedTokens.sub(c.total.sub(c.claimed));
            c.total = 0;
            c.claimed = 0;
        }
    }

    function isClaimed(uint256 _claimIndex, uint256 _index) public view returns (bool) {
        uint256 claimedWordIndex = _index / 256;
        uint256 claimedBitIndex = _index % 256;
        uint256 claimedWord = claimedBitMap[_claimIndex][claimedWordIndex];
        uint256 mask = (1 << claimedBitIndex);
        return claimedWord & mask == mask;
    }

    function _setClaimed(uint256 _claimIndex, uint256 _index) private {
        uint256 claimedWordIndex = _index / 256;
        uint256 claimedBitIndex = _index % 256;
        claimedBitMap[_claimIndex][claimedWordIndex] = claimedBitMap[_claimIndex][claimedWordIndex] | (1 << claimedBitIndex);
    }

    function claim(
        uint256 _claimIndex,
        uint256 _index,
        uint256 _amount,
        address _receiver,
        bytes32[] calldata _merkleProof
    ) external {
        require(_claimIndex < claims.length, 'MerkleDistributor: Invalid merkleIndex');
        require(!isClaimed(_claimIndex, _index), 'MerkleDistributor: Drop already claimed.');

        ClaimRecord storage c = claims[_claimIndex];
        require(c.validUntil > block.timestamp, 'MerkleDistributor: Drop has expired.');

        c.claimed = c.claimed.add(_amount);
        require(c.total >= c.claimed, 'MerkleDistributor: Exceeds allocated total for drop.');

        reservedTokens = reservedTokens.sub(_amount);
        mintedTokens = mintedTokens.add(_amount);

        // Verify the merkle proof.
        bytes32 node = keccak256(abi.encodePacked(_index, msg.sender, _amount));
        require(verify(_merkleProof, c.merkleRoot, node), 'MerkleDistributor: Invalid proof.');

        // Mark it claimed and send the token.
        _setClaimed(_claimIndex, _index);
        rewardMinter.mint(_receiver, _amount, true);

        emit Claimed(msg.sender, _claimIndex, _index, _amount, _receiver);
    }

    function verify(bytes32[] calldata _proof, bytes32 _root, bytes32 _leaf) internal pure returns (bool) {
        bytes32 computedHash = _leaf;

        for (uint256 i = 0; i < _proof.length; i++) {
            bytes32 proofElement = _proof[i];

            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
            }
        }

        // Check if the computed hash (root) is equal to the provided root
        return computedHash == _root;
    }

}

// SPDX-License-Identifier: MIT
pragma solidity 0.7.6;

/*
 * @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 GSN 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 payable) {
    return msg.sender;
  }

  function _msgData() internal view virtual returns (bytes memory) {
    this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
    return msg.data;
  }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.7.6;

import './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.
 */
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() {
    address msgSender = _msgSender();
    _owner = msgSender;
    emit OwnershipTransferred(address(0), msgSender);
  }

  /**
   * @dev Returns the address of the current owner.
   */
  function owner() public view 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 {
    emit OwnershipTransferred(_owner, address(0));
    _owner = 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');
    emit OwnershipTransferred(_owner, newOwner);
    _owner = newOwner;
  }
}

// SPDX-License-Identifier: agpl-3.0
pragma solidity 0.7.6;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
  /**
   * @dev Returns the addition of two unsigned integers, reverting on
   * overflow.
   *
   * Counterpart to Solidity's `+` operator.
   *
   * Requirements:
   * - Addition cannot overflow.
   */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a, 'SafeMath: addition overflow');

    return c;
  }

  /**
   * @dev Returns the subtraction of two unsigned integers, reverting on
   * overflow (when the result is negative).
   *
   * Counterpart to Solidity's `-` operator.
   *
   * Requirements:
   * - Subtraction cannot overflow.
   */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    return sub(a, b, 'SafeMath: subtraction overflow');
  }

  /**
   * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
   * overflow (when the result is negative).
   *
   * Counterpart to Solidity's `-` operator.
   *
   * Requirements:
   * - Subtraction cannot overflow.
   */
  function sub(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    require(b <= a, errorMessage);
    uint256 c = a - b;

    return c;
  }

  /**
   * @dev Returns the multiplication of two unsigned integers, reverting on
   * overflow.
   *
   * Counterpart to Solidity's `*` operator.
   *
   * Requirements:
   * - Multiplication cannot overflow.
   */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
    if (a == 0) {
      return 0;
    }

    uint256 c = a * b;
    require(c / a == b, 'SafeMath: multiplication overflow');

    return c;
  }

  /**
   * @dev Returns the integer division of two unsigned integers. Reverts on
   * division by zero. The result is rounded towards zero.
   *
   * Counterpart to Solidity's `/` operator. Note: this function uses a
   * `revert` opcode (which leaves remaining gas untouched) while Solidity
   * uses an invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    return div(a, b, 'SafeMath: division by zero');
  }

  /**
   * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
   * division by zero. The result is rounded towards zero.
   *
   * Counterpart to Solidity's `/` operator. Note: this function uses a
   * `revert` opcode (which leaves remaining gas untouched) while Solidity
   * uses an invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function div(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    // Solidity only automatically asserts when dividing by 0
    require(b > 0, errorMessage);
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold

    return c;
  }

  /**
   * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
   * Reverts when dividing by zero.
   *
   * Counterpart to Solidity's `%` operator. This function uses a `revert`
   * opcode (which leaves remaining gas untouched) while Solidity uses an
   * invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    return mod(a, b, 'SafeMath: modulo by zero');
  }

  /**
   * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
   * Reverts with custom message when dividing by zero.
   *
   * Counterpart to Solidity's `%` operator. This function uses a `revert`
   * opcode (which leaves remaining gas untouched) while Solidity uses an
   * invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function mod(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    require(b != 0, errorMessage);
    return a % b;
  }
}

pragma solidity 0.7.6;

interface IMultiFeeDistribution {

    function addReward(address rewardsToken) external;
    function mint(address user, uint256 amount, bool withPenalty) external;

}

{
  "optimizer": {
    "enabled": true,
    "runs": 2000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

[{"inputs":[{"internalType":"contract IMultiFeeDistribution","name":"_rewardMinter","type":"address"},{"internalType":"uint256","name":"_maxMintable","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"uint256","name":"merkleIndex","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"index","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"receiver","type":"address"}],"name":"Claimed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"bytes32","name":"_root","type":"bytes32"},{"internalType":"uint256","name":"_duration","type":"uint256"},{"internalType":"uint256","name":"_total","type":"uint256"}],"name":"addClaimRecord","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_claimIndex","type":"uint256"},{"internalType":"uint256","name":"_index","type":"uint256"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address","name":"_receiver","type":"address"},{"internalType":"bytes32[]","name":"_merkleProof","type":"bytes32[]"}],"name":"claim","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"claims","outputs":[{"internalType":"bytes32","name":"merkleRoot","type":"bytes32"},{"internalType":"uint256","name":"validUntil","type":"uint256"},{"internalType":"uint256","name":"total","type":"uint256"},{"internalType":"uint256","name":"claimed","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"duration","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_claimIndex","type":"uint256"},{"internalType":"uint256","name":"_index","type":"uint256"}],"name":"isClaimed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxMintableTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minDuration","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mintableBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mintedTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"_claimIndexes","type":"uint256[]"}],"name":"releaseExpiredClaimReserves","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"reservedTokens","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"rewardMinter","outputs":[{"internalType":"contract IMultiFeeDistribution","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"startTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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