contract TLSToken is Governance, ERC20Detailed{

    using SafeMath for uint256;

    //events
    event eveSetRate(uint256 burn_rate, uint256 reward_rate);
    event eveRewardPool(address rewardPool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Mint(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    // for minters
    mapping (address => bool) public _minters;
    mapping (address => uint256) public _minters_number;
    //token base data
    uint256 internal _totalSupply;
    mapping(address => uint256) public _balances;
    mapping (address => mapping (address => uint256)) public _allowances;

    /// Constant token specific fields
    uint8 internal constant _decimals = 18;
    uint256 public  _maxSupply = 0;

    ///
    bool public _openTransfer = false;

    // hardcode limit rate
    uint256 public constant _maxGovernValueRate = 2000;//2000/10000
    uint256 public constant _minGovernValueRate = 10;  //10/10000
    uint256 public constant _rateBase = 10000; 

    // additional variables for use if transaction fees ever became necessary
    uint256 public  _burnRate = 150;       
    uint256 public  _rewardRate = 150;   

    uint256 public _totalBurnToken = 0;
    uint256 public _totalRewardToken = 0;

    //todo reward pool!
    address public _rewardPool = 0xd340A68642C3de2c73C98713006663633E6F93E1;
    //todo burn pool!
    address public _burnPool = 0x6666666666666666666666666666666666666666;

    /**
    * @dev set the token transfer switch
    */
    function enableOpenTransfer() public onlyGovernance  
    {
        _openTransfer = true;
    }


    /**
     * CONSTRUCTOR
     *
     * @dev Initialize the Token
     */

    constructor () public ERC20Detailed("tellus", "TLS", _decimals) {
        uint256 _exp = _decimals;
         _maxSupply = 21000000 * (10**_exp);
    }


    
    /**
    * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
    * @param spender The address which will spend the funds.
    * @param amount The amount of tokens to be spent.
    */
    function approve(address spender, uint256 amount) public 
    returns (bool) 
    {
        require(msg.sender != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);

        return true;
    }

    /**
    * @dev Function to check the amount of tokens than an owner _allowed to a spender.
    * @param owner address The address which owns the funds.
    * @param spender address The address which will spend the funds.
    * @return A uint256 specifying the amount of tokens still available for the spender.
    */
    function allowance(address owner, address spender) public view 
    returns (uint256) 
    {
        return _allowances[owner][spender];
    }

    /**
    * @dev Gets the balance of the specified address.
    * @param owner The address to query the the balance of.
    * @return An uint256 representing the amount owned by the passed address.
    */
    function balanceOf(address owner) public  view 
    returns (uint256) 
    {
        return _balances[owner];
    }

    /**
    * @dev return the token total supply
    */
    function totalSupply() public view 
    returns (uint256) 
    {
        return _totalSupply;
    }

    /**
    * @dev for mint function
    */
    function mint(address account, uint256 amount) public 
    {
        require(account != address(0), "ERC20: mint to the zero address");
        require(_minters[msg.sender], "!minter");
        require(_minters_number[msg.sender]>=amount);
        uint256 curMintSupply = _totalSupply.add(_totalBurnToken);
        uint256 newMintSupply = curMintSupply.add(amount);
        require( newMintSupply <= _maxSupply,"supply is max!");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        _minters_number[msg.sender] = _minters_number[msg.sender].sub(amount);
        emit Mint(address(0), account, amount);
        emit Transfer(address(0), account, amount);
    }

    function addMinter(address _minter,uint256 number) public onlyGovernance 
    {
        _minters[_minter] = true;
        _minters_number[_minter] = number;
    }


    function setMinter_number(address _minter,uint256 number) public onlyGovernance 
    {
        require(_minters[_minter]);
        _minters_number[_minter] = number;
    }
    
    function removeMinter(address _minter) public onlyGovernance 
    {
        _minters[_minter] = false;
        _minters_number[_minter] = 0;
    }
    

    function() external payable {
        revert();
    }

    /**
    * @dev for govern value
    */
    function setRate(uint256 burn_rate, uint256 reward_rate) public 
        onlyGovernance 
    {
        
        require(_maxGovernValueRate >= burn_rate && burn_rate >= _minGovernValueRate,"invalid burn rate");
        require(_maxGovernValueRate >= reward_rate && reward_rate >= _minGovernValueRate,"invalid reward rate");

        _burnRate = burn_rate;
        _rewardRate = reward_rate;

        emit eveSetRate(burn_rate, reward_rate);
    }


    /**
    * @dev for set reward
    */
    function setRewardPool(address rewardPool) public 
        onlyGovernance 
    {
        require(rewardPool != address(0x0));

        _rewardPool = rewardPool;

        emit eveRewardPool(_rewardPool);
    }
    /**
    * @dev transfer token for a specified address
    * @param to The address to transfer to.
    * @param value The amount to be transferred.
    */
   function transfer(address to, uint256 value) public 
   returns (bool)  
   {
        return _transfer(msg.sender,to,value);
    }

    /**
    * @dev Transfer tokens from one address to another
    * @param from address The address which you want to send tokens from
    * @param to address The address which you want to transfer to
    * @param value uint256 the amount of tokens to be transferred
    */
    function transferFrom(address from, address to, uint256 value) public 
    returns (bool) 
    {
        uint256 allow = _allowances[from][msg.sender];
        _allowances[from][msg.sender] = allow.sub(value);
        
        return _transfer(from,to,value);
    }

 

    /**
    * @dev Transfer tokens with fee
    * @param from address The address which you want to send tokens from
    * @param to address The address which you want to transfer to
    * @param value uint256s the amount of tokens to be transferred
    */
    function _transfer(address from, address to, uint256 value) internal 
    returns (bool) 
    {
        // :)
        require(_openTransfer || from == governance, "transfer closed");

        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        uint256 sendAmount = value;
        uint256 burnFee = (value.mul(_burnRate)).div(_rateBase);
        if (burnFee > 0) {
            //to burn
            _balances[_burnPool] = _balances[_burnPool].add(burnFee);
            _totalSupply = _totalSupply.sub(burnFee);
            sendAmount = sendAmount.sub(burnFee);

            _totalBurnToken = _totalBurnToken.add(burnFee);

            emit Transfer(from, _burnPool, burnFee);
        }

        uint256 rewardFee = (value.mul(_rewardRate)).div(_rateBase);
        if (rewardFee > 0) {
           //to reward
            _balances[_rewardPool] = _balances[_rewardPool].add(rewardFee);
            sendAmount = sendAmount.sub(rewardFee);

            _totalRewardToken = _totalRewardToken.add(rewardFee);

            emit Transfer(from, _rewardPool, rewardFee);
        }

        _balances[from] = _balances[from].sub(value);
        _balances[to] = _balances[to].add(sendAmount);

        emit Transfer(from, to, sendAmount);

        return true;
    }
}
/// @title DegoToken Contract
function balanceOf(address owner) public  view 
    returns (uint256) 
    {
        return _balances[owner];
    }
/**
 * @dev Gets the balance of the specified address.
 * @param owner The address to query the the balance of.
 * @return An uint256 representing the amount owned by the passed address.
 */