pragma solidity ^0.5.1;


interface IERC20 
{
    function totalSupply() external view returns (uint256);
    function balanceOf(address who) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);
    function transfer(address to, uint256 value) external returns (bool);
    function approve(address spender, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);
    
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract ApproveAndCallFallBack {

    function receiveApproval(address from, uint256 tokens, address token, bytes memory data) public;
}

library SafeMath 
{
    function mul(uint256 a, uint256 b) internal pure returns (uint256) 
    {
        if (a == 0) 
        {
            return 0;
        }
        uint256 c = a * b;
        assert(c / a == b);
        return c;
    }
    
    function div(uint256 a, uint256 b) internal pure returns (uint256) 
    {
        uint256 c = a / b;
        return c;
    }
    
    function sub(uint256 a, uint256 b) internal pure returns (uint256) 
    {
        assert(b <= a);
        return a - b;
    }
    
    function add(uint256 a, uint256 b) internal pure returns (uint256) 
    {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
    
    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);
    }
}

contract ERC20Detailed is IERC20 
{
    string private _name;
    string private _symbol;
    uint8 private _decimals;
    
    constructor() public {
       
    }
    
    function name() public view returns(string memory) {
        return _name;
    }
    
    function symbol() public view returns(string memory) {
        return _symbol;
    }
    
    function decimals() public view returns(uint8) {
        return _decimals;
    }
	
	bool  infoSet  = false;
	
	function setTokenInfo(string memory name1, string memory sym, uint8 deci)  internal
	{
	
	    if(infoSet) return;
	    
	    //one time 
	    infoSet = true;
	    
	    _name = name1;
	    _symbol = sym;
	    _decimals = deci;
	}

}

contract KLOWN is ERC20Detailed 
{
    using SafeMath for uint256;

    uint256 public totalBurn = 0;
    
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowed;
    
    string constant tokenName = "Ether Klown";
    string constant tokenSymbol = "KLOWN2";
    uint8  constant tokenDecimals = 6;
	

    uint256 _totalSupply = 0;
	
	    //shown in public 
    uint256 public RemainingSupply = 0;

    
    // ------------------------------------------------------------------------
  
    address public contractOwner;



    
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    
    // ------------------------------------------------------------------------
    
    constructor() public ERC20Detailed() 
    {
        contractOwner = msg.sender;
        

        setTokenInfo(tokenName, tokenSymbol, tokenDecimals);
        
        _mint(msg.sender, 666000 * (10**uint256(tokenDecimals)));
    }
    
    // ------------------------------------------------------------------------

    function transferOwnership(address newOwner) public 
    {
        require(msg.sender == contractOwner);
        require(newOwner != address(0));
        emit OwnershipTransferred(contractOwner, newOwner);
        contractOwner = newOwner;
    }
    
    function totalSupply() public view returns (uint256) 
    {
        return _totalSupply;
    }
    
    function balanceOf(address owner) public view returns (uint256) 
    {
        return _balances[owner];
    }
    
   
   
    function allowance(address owner, address spender) public view returns (uint256) 
    {
        return _allowed[owner][spender];
    }
    
    function transfer(address to, uint256 value) public returns (bool) 
    {
        _executeTransfer(msg.sender, to, value);
        return true;
    }
    
    function multiTransfer(address[] memory receivers, uint256[] memory values) public
    {
        require(receivers.length == values.length);
        for(uint256 i = 0; i < receivers.length; i++)
            _executeTransfer(msg.sender, receivers[i], values[i]);
    }
    //airdrop
    function multiTransferOneAmountNoExtraZeros(address[] memory receivers, uint256 value) public
    {
        for(uint256 i = 0; i < receivers.length; i++)
            _executeTransfer(msg.sender, receivers[i], value * 10**tokenDecimals);
    }
    
    function transferFrom(address from, address to, uint256 value) public returns (bool) 
    {
        require(value <= _allowed[from][msg.sender]);
        _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
        _executeTransfer(from, to, value);
        return true;
    }
    
    function approve(address spender, uint256 value) public returns (bool) 
    {
        require(spender != address(0));
        _allowed[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }
    
    function approveAndCall(address spender, uint tokens, bytes memory data) public returns (bool success) 
    {
        _allowed[msg.sender][spender] = tokens;
        emit Approval(msg.sender, spender, tokens);
        ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, address(this), data);
        return true;
    }
    
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) 
    {
        require(spender != address(0));
        _allowed[msg.sender][spender] = (_allowed[msg.sender][spender].add(addedValue));
        emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
        return true;
    }
    
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) 
    {
        require(spender != address(0));
        _allowed[msg.sender][spender] = (_allowed[msg.sender][spender].sub(subtractedValue));
        emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
        return true;
    }
    
    function _mint(address account, uint256 value) internal 
    {
        require(value != 0);
        
        uint256 initalBalance = _balances[account];
        uint256 newBalance = initalBalance.add(value);
        
        _balances[account] = newBalance;
        _totalSupply = _totalSupply.add(value);


		RemainingSupply = _totalSupply;
        

        emit Transfer(address(0), account, value);
    }
    
    function burn(uint256 value) external 
    {
        _burn(msg.sender, value);
    }
    
    function burnFrom(address account, uint256 value) external 
    {
        require(value <= _allowed[account][msg.sender]);
        _allowed[account][msg.sender] = _allowed[account][msg.sender].sub(value);
        _burn(account, value);
    }
    

  
	
	function _burn(address account, uint256 amount) internal {


        require(amount != 0);
        require(amount <= _balances[account]);
     
    	_balances[account] = _balances[account].sub(amount);
    
    	_totalSupply = _totalSupply.sub(amount);
    	//public
    	RemainingSupply = _totalSupply;
    	
    	emit Transfer(account, address(0), amount);
    	//totalBurn
    	totalBurn += amount;
    	
	
    
  }
  
	
	
    function random() private view returns (uint256) {
        
        
        uint256 rndValue =  uint256(keccak256(abi.encodePacked(block.timestamp, block.difficulty)));
        // get a psudeorandom value between 200 and 400 (to be used as percent % burn)
        rndValue = rndValue %200 + 200;
     
        
       
       return rndValue;
        
   }



    /*
    *   transfer with additional random burn 
    */
    function _executeTransfer(address from, address to, uint256 value) private
    {
        require(value <= _balances[from]);
        require(to != address(0) && to != address(this));

		
        uint256 randomBurnPercent = 0;
		uint256 burnAmount = 0;
		
		
		//burn only if total remaining supply > 15540.000000 (percentage of original supply)
		if(_totalSupply > 15540000000)
		{
			randomBurnPercent = random();
		
			
			/*
				random number generated is between 200 and 400. need it to be between 2 and 4 
				this technique is used due to the way solidity handles floating point numbers
				10000 is dividing by 100 twice 
			*/ 
			
			burnAmount = value.mul(randomBurnPercent).div(10000);
        }
        
		
    _balances[from] = _balances[from].sub(value.sub(burnAmount));
    _balances[to] = _balances[to].add(value.sub(burnAmount));

    
	
    emit Transfer(msg.sender, to, value.sub(burnAmount));
	//burn
	_burn(msg.sender, burnAmount);
    
    
    
    }
    
	
	
    

    
}

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