// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/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.
 */
abstract 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() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: @uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router01.sol



pragma solidity >=0.6.2;

interface IUniswapV2Router01 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint amountADesired,
        uint amountBDesired,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB, uint liquidity);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function removeLiquidity(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETH(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountToken, uint amountETH);
    function removeLiquidityWithPermit(
        address tokenA,
        address tokenB,
        uint liquidity,
        uint amountAMin,
        uint amountBMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountA, uint amountB);
    function removeLiquidityETHWithPermit(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountToken, uint amountETH);
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapTokensForExactTokens(
        uint amountOut,
        uint amountInMax,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);
    function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
        external
        returns (uint[] memory amounts);
    function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
        external
        payable
        returns (uint[] memory amounts);

    function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
    function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
    function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
    function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
}

// File: @uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol



pragma solidity >=0.6.2;

import './IUniswapV2Router01.sol';

interface IUniswapV2Router02 is IUniswapV2Router01 {
    function removeLiquidityETHSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external returns (uint amountETH);
    function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
        address token,
        uint liquidity,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline,
        bool approveMax, uint8 v, bytes32 r, bytes32 s
    ) external returns (uint amountETH);

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable;
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
}

// File: @uniswap/v2-periphery/contracts/interfaces/IWETH.sol



pragma solidity >=0.5.0;

interface IWETH {
    function deposit() external payable;
    function transfer(address to, uint value) external returns (bool);
    function withdraw(uint) external;
}

// File: src/Kong/Interfaces.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";

interface ITreasury {
	function mint(address to_, uint256 amount_) external;

	function TOKEN() external view returns (address);

	function excessReserves() external view returns (uint256);
}

interface IDistributor {
	function distribute() external;

	function nextRewardAt(uint256 _rate) external view returns (uint256);

	function nextReward() external view returns (uint256);
}

interface IStaking {
	function stake(address _to, uint256 _amount) external;

	function unstake(address _to, uint256 _amount, bool _rebase) external;

	function rebase() external;

	function index() external view returns (uint256);
}

interface ITOKEN is IERC20Metadata {
	function mint(address to_, uint256 amount_) external;

	function burnFrom(address account_, uint256 amount_) external;

	function burn(uint256 amount_) external;

	function uniswapV2Pair() external view returns (address);
}

interface IsStakingProtocol is IERC20 {
	function rebase(uint256 amount_, uint epoch_) external returns (uint256);

	function circulatingSupply() external view returns (uint256);

	function gonsForBalance(uint amount) external view returns (uint);

	function balanceForGons(uint gons) external view returns (uint);

	function index() external view returns (uint);
}

// File: src/Kong/Treasury.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

/*

PONZI KONG

(Website) https://pkong.farm
(Telegram) https://t.me/ponzi_kong
(Twitter) https://twitter.com/PONZIKONG

*/

import "./Interfaces.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IUniswapV2Router02.sol";
import "@uniswap/v2-periphery/contracts/interfaces/IWETH.sol";

contract Treasury is Ownable, ITreasury {
	/// STATE VARIABLS ///

	/// @notice Address of UniswapV2Router
	IUniswapV2Router02 public immutable uniswapV2Router;

	/// @notice address
	address public immutable TOKEN;

	/// @notice LP
	address public immutable uniswapV2Pair;

	/// @notice Distributor
	address public distributor;

	/// @notice Backing amount
	uint256 public BACKING = 0.000000001 ether;

	/// @notice Time to wait before removing liquidity again
	uint256 public constant TIME_TO_WAIT = 1 days;

	/// @notice Max percent of liqudity that can be removed at one time
	uint256 public constant MAX_REMOVAL = 10;

	/// @notice Timestamp of last liquidity removal
	uint256 public lastRemoval;

	/// CONSTRUCTOR ///

	constructor(address _TOKEN) {
		TOKEN = _TOKEN;
		uniswapV2Pair = ITOKEN(TOKEN).uniswapV2Pair();
		IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
		uniswapV2Router = _uniswapV2Router;
	}

	/// INCREASE LIQUIDITY ///

	/// @notice         Increases WETH backing to improve liquidity
	/// @param _newBacking  Amount in ETH to increase backing by
	function increaseBacking(uint256 _newBacking) external onlyOwner {
		require(_newBacking != BACKING, "New backing must be different");
		BACKING = _newBacking;
	}

	/// RECEIVE ///

	/// @notice Allow to receive ETH
	receive() external payable {}

	/// MINTER FUNCTION ///

	/// @notice         Distributor mints TOKEN
	/// @param _to      Address where to mint TOKEN
	/// @param _amount  Amount of TOKEN to mint
	function mint(address _to, uint256 _amount) external {
		require(msg.sender == distributor, "msg.sender is not distributor");
		ITOKEN(TOKEN).mint(_to, _amount);
	}

	/// VIEW FUNCTION ///

	/// @notice         Returns amount of excess reserves
	/// @return value_  Excess reserves
	function excessReserves() external view returns (uint256 value_) {
		uint256 _balance = IERC20(uniswapV2Router.WETH()).balanceOf(address(this));
		uint256 _value = (_balance * 1e9) / BACKING;
		if (IERC20(TOKEN).totalSupply() > _value) return 0;
		return (_value - IERC20(TOKEN).totalSupply());
	}

	/// MUTATIVE FUNCTIONS ///

	/// @notice         Redeem TOKEN for backing
	/// @param _amount  Amount of TOKEN to redeem
	function redeem(uint256 _amount) external {
		ITOKEN(TOKEN).burnFrom(msg.sender, _amount);
		IERC20(uniswapV2Router.WETH()).transfer(msg.sender, (_amount * BACKING) / 1e9);
	}

	/// @notice Wrap any ETH in contract
	function wrapETH() external {
		uint256 ethBalance_ = address(this).balance;
		if (ethBalance_ > 0) IWETH(uniswapV2Router.WETH()).deposit{value: ethBalance_}();
	}

	/// OWNER FUNCTIONS ///

	/// @notice              Set TOKEN distributor
	/// @param _distributor  Address of TOKEN distributor
	function setDistributor(address _distributor) external onlyOwner {
		require(distributor == address(0), "distributor already set");
		distributor = _distributor;
	}

	/// @notice         Remove liquidity and add to backing
	/// @param _amount  Amount of liquidity to remove
	function removeLiquidity(uint256 _amount) external onlyOwner {
		uint256 balance = IERC20(uniswapV2Pair).balanceOf(address(this));
		require(_amount <= (balance * MAX_REMOVAL) / 100, "Removing more than 10% of liquidity");
		require(block.timestamp > lastRemoval + TIME_TO_WAIT, "Removed before 1 day lock");
		lastRemoval = block.timestamp;

		IERC20(uniswapV2Pair).approve(address(uniswapV2Router), _amount);

		uniswapV2Router.removeLiquidityETHSupportingFeeOnTransferTokens(
			TOKEN,
			_amount,
			0,
			0,
			address(this),
			block.timestamp
		);

		_burn();
	}

	/// @notice         Withdraw stuck token from treasury
	/// @param _amount  Amount of token to remove
	/// @param _token   Address of token to remove
	function withdrawStuckToken(uint256 _amount, address _token) external onlyOwner {
		require(_token != uniswapV2Router.WETH(), "Can not withdraw WETH");
		require(_token != uniswapV2Pair, "Can not withdraw LP");
		IERC20(_token).transfer(msg.sender, _amount);
	}

	/// INTERNAL FUNCTION ///

	/// @notice Burn TOKEN from Treasury to increase backing
	/// @dev    Invoked in `removeLiquidity()`
	function _burn() internal {
		uint256 balance = IERC20(TOKEN).balanceOf(address(this));
		ITOKEN(TOKEN).burn(balance);
	}
}