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//SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

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

contract Airdrop {
    using SafeMath for uint256;

    uint256 public constant APRIL_28_NOON = 1619625600;
    uint256 private constant SIX_WEEKS = 6 weeks;
    uint256 private constant ONE_WEEK = 1 weeks;

    bytes32 public immutable _rootHash;
    IERC20 public immutable _token;
    uint256 public immutable _blockDeadline;
    uint256 public immutable _blockReductionsBegin;
    address public immutable _treasury;

    mapping (uint256 => uint256) _redeemed;

    constructor(IERC20 token, bytes32 rootHash, address treasury) {
        
        _token = token;
        _rootHash = rootHash;
        _treasury = treasury;

        _blockReductionsBegin = APRIL_28_NOON
            .add(SIX_WEEKS);
        
        _blockDeadline = APRIL_28_NOON
            .add(SIX_WEEKS)
            .add(ONE_WEEK);
    }

    function redeemed(uint256 index) public view returns (bool) {
        uint256 redeemedBlock = _redeemed[index / 256];
        uint256 redeemedMask = (uint256(1) << uint256(index % 256));
        return ((redeemedBlock & redeemedMask) != 0);
    }

    function redeemPackage(uint256 index, address recipient, uint256 amount, bytes32[] memory merkleProof) public {

        require(block.timestamp <= _blockDeadline, "Airdrop: Redemption deadline passed.");

        // Make sure this package has not already been claimed (and claim it)
        uint256 redeemedBlock = _redeemed[index / 256];
        uint256 redeemedMask = (uint256(1) << uint256(index % 256));
        require((redeemedBlock & redeemedMask) == 0, "Airdrop: already redeemed");
        _redeemed[index / 256] = redeemedBlock | redeemedMask;

        // Compute the merkle root
        bytes32 node = keccak256(abi.encode(index, recipient, amount));

        uint256 path = index;
        for (uint16 i = 0; i < merkleProof.length; i++) {
            if ((path & 0x01) == 1) {
                node = keccak256(abi.encode(merkleProof[i], node));
            } else {
                node = keccak256(abi.encode(node, merkleProof[i]));
            }
            path /= 2;
        }

        // Check the merkle proof
        require(node == _rootHash, "Airdrop: Merkle root mismatch");

        // Redeem!
        uint256 sendAmount = amount;
        if (block.timestamp > _blockReductionsBegin) {
            sendAmount = reducedAmount(amount);
        }

        require(
            IERC20(_token).transfer(recipient, sendAmount),
            "Airdrop: Token transfer fail"
        );

    }

    function reducedAmount(uint256 originalAmount)
        public
        view
        returns (uint256)
    {
        uint256 blocksSinceReductionStarted = block.timestamp
            .sub(_blockReductionsBegin);

        uint256 reduceBy = blocksSinceReductionStarted
            .mul(originalAmount)
            .div(ONE_WEEK);

        return originalAmount.sub(reduceBy);
    }

    function sweepPostDeadline(IERC20 token)
        public
    {
        require(block.timestamp > _blockDeadline, "Airdrop: Deadline has not yet passed.");

        uint256 tokenBalance = IERC20(token).balanceOf(address(this));
        require(
            IERC20(token).transfer(_treasury, tokenBalance),
            "Airdrop: Token transfer to treasury fail"
        );
    }
}

// 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;

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

        return c;
    }

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

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

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

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[{"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"},{"internalType":"bytes32","name":"rootHash","type":"bytes32"},{"internalType":"address","name":"treasury","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"APRIL_28_NOON","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_blockDeadline","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_blockReductionsBegin","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_rootHash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_token","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_treasury","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes32[]","name":"merkleProof","type":"bytes32[]"}],"name":"redeemPackage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"redeemed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"originalAmount","type":"uint256"}],"name":"reducedAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"}],"name":"sweepPostDeadline","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000002c31b10ca416b82cec4c5e93c615ca851213d48d35e919443870701668242995e61d3c1d1c2bdcb062b80046eca1a687198ba3830000000000000000000000000af0625b772472d18825c104b9dae35f76d3f6e0

-----Decoded View---------------
Arg [0] : token (address): 0x2C31b10ca416b82Cec4c5E93c615ca851213d48D
Arg [1] : rootHash (bytes32): 0x35e919443870701668242995e61d3c1d1c2bdcb062b80046eca1a687198ba383
Arg [2] : treasury (address): 0x0aF0625b772472d18825c104b9daE35f76d3f6E0

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000002c31b10ca416b82cec4c5e93c615ca851213d48d
Arg [1] : 35e919443870701668242995e61d3c1d1c2bdcb062b80046eca1a687198ba383
Arg [2] : 0000000000000000000000000af0625b772472d18825c104b9dae35f76d3f6e0