// File: contracts/MerkleDistributor.sol



// SPDX-License-Identifier: UNLICENSED

pragma solidity 0.8.4;

import "./IMerkleDistributor.sol";

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

contract MerkleDistributor is IMerkleDistributor {
   address public immutable override token;
   address public immutable treasury;
   bytes32 public immutable override merkleRoot;
   // This is a packed array of booleans.
   mapping(uint256 => uint256) private claimedBitMap;

   constructor(
      address token_,
      bytes32 merkleRoot_,
      address treasury_
   ) {
      token = token_;
      merkleRoot = merkleRoot_;
      treasury = treasury_;
   }

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

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

   function claim(
      uint256 index,
      address account,
      uint256 amount,
      bytes32[] calldata merkleProof
   ) external override {
      require(!isClaimed(index), "MerkleDistributor: Drop already claimed.");

      // Verify the merkle proof.
      bytes32 node = keccak256(abi.encodePacked(index, account, amount));
      require(
         MerkleProof.verify(merkleProof, merkleRoot, node),
         "MerkleDistributor: Invalid proof."
      );

      // Mark it claimed and send the token.
      _setClaimed(index);
      require(
         IERC20(token).transfer(account, amount),
         "MerkleDistributor: Transfer failed."
      );

      emit Claimed(index, account, amount);
   }

   function endAirdrop() public {
      require(
         msg.sender == treasury,
         "MerkleDistributor: Not initiated by treasury."
      );
      IERC20(token).transfer(treasury, IERC20(token).balanceOf(address(this)));
   }
}
// File: contracts/IMerkleDistributor.sol



// SPDX-License-Identifier: MIT
pragma solidity 0.8.4;

// Allows anyone to claim a token if they exist in a merkle root.
interface IMerkleDistributor {
   // Returns the address of the token distributed by this contract.
   function token() external view returns (address);

   // Returns the merkle root of the merkle tree containing account balances available to claim.
   function merkleRoot() external view returns (bytes32);

   // Returns true if the index has been marked claimed.
   function isClaimed(uint256 index) external view returns (bool);

   // Claim the given amount of the token to the given address. Reverts if the inputs are invalid.
   function claim(
      uint256 index,
      address account,
      uint256 amount,
      bytes32[] calldata merkleProof
   ) external;

   // This event is triggered whenever a call to #claim succeeds.
   event Claimed(uint256 index, address account, uint256 amount);
}
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: @openzeppelin/contracts/utils/cryptography/MerkleProof.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Trees proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(bytes32[] memory 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;
    }
}