contract ERC20Token is IERC20, Pausable {
    using SafeMath for uint256;
    using Address for address;

    string internal _name;
    string internal _symbol;
    uint8 internal _decimals;
    uint256 internal _totalSupply;

    mapping (address => uint256) internal _balances;
    mapping (address => mapping (address => uint256)) internal _allowances;

    constructor(string memory name, string memory symbol, uint8 decimals, uint256 totalSupply) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
        _totalSupply = totalSupply;
        _balances[msg.sender] = totalSupply;
        emit Transfer(address(0), msg.sender, totalSupply);
    }

    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;
    }

    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view returns (uint256 balance) {
        return _balances[account];
    }


    // Function that is called when a user or another contract wants to transfer funds .
    function transfer(address recipient, uint256 amount)
    public
    whenNotPaused
    returns (bool success)
    {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function allowance(address owner, address spender)
    public
    view
    returns (uint256)
    {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 value)
    public
    whenNotPaused
    returns (bool)
    {
        _approve(msg.sender, spender, value);
        return true;
    }


    function transferFrom(address sender, address recipient, uint256 amount)
    public
    whenNotPaused
    returns (bool)
    {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
        return true;
    }



    function increaseAllowance(address spender, uint256 addedValue)
    public
    whenNotPaused
    returns (bool)
    {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
        return true;
    }

    function decreaseAllowance(address spender, uint256 subtractedValue)
    public
    whenNotPaused
    returns (bool)
    {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
        return true;
    }

    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount);
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    function _approve(address owner, address spender, uint256 value) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

	
   // function mint(address account,uint256 amount) public onlyOwner returns (bool) {
    //    _mint(account, amount);
    //    return true;
   // }
    
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }    

    function burn(address account,uint256 amount) public onlyOwner returns (bool) {
        _burn(account, amount);
        return true;
    }
    
    function _burn(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: burn to the zero address");

	 _balances[account] = _balances[account].sub(amount);
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }    
    
}
function _mint(address account, uint256 amount) internal {
    require(account != address(0), "ERC20: mint to the zero address");

    _totalSupply = _totalSupply.add(amount);
    _balances[account] = _balances[account].add(amount);
    emit Transfer(address(0), account, amount);
}    

// function mint(address account,uint256 amount) public onlyOwner returns (bool) {
//    _mint(account, amount);
//    return true;
// }