pragma solidity ^0.4.23;

library SafeMath {
    function mul(uint256 _x, uint256 _y) internal pure returns (uint256 z) {
        if (_x == 0) {
            return 0;
        }
        z = _x * _y;
        assert(z / _x == _y);
        return z;
    }

    function div(uint256 _x, uint256 _y) internal pure returns (uint256) {
        return _x / _y;
    }

    function sub(uint256 _x, uint256 _y) internal pure returns (uint256) {
        assert(_y <= _x);
        return _x - _y;
    }

    function add(uint256 _x, uint256 _y) internal pure returns (uint256 z) {
        z = _x + _y;
        assert(z >= _x);
        return z;
    }
}

contract Ownable {
    address public owner;

    event OwnershipTransferred(address indexed _previousOwner, address indexed _newOwner);

    constructor() public {
        owner = msg.sender;
    }

    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    function transferOwnership(address _newOwner) onlyOwner public {
        require(_newOwner != address(0));

        owner = _newOwner;

        emit OwnershipTransferred(owner, _newOwner);
    }
}

contract Erc20Wrapper {
    function totalSupply() public view returns (uint256);
    function balanceOf(address _who) public view returns (uint256);
    function transfer(address _to, uint256 _value) public returns (bool);
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool);
    function approve(address _spender, uint256 _value) public returns (bool);
    function allowance(address _owner, address _spender) public view returns (uint256);

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}

contract StandardToken is Erc20Wrapper {
    using SafeMath for uint256;

    mapping(address => uint256) balances;
    mapping (address => mapping (address => uint256)) internal allowed;

    uint256 totalSupply_;

    function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }

    function balanceOf(address _owner) public view returns (uint256) {
        return balances[_owner];
    }

    function transfer(address _to, uint256 _value) public returns (bool) {
        require(_to != address(0));
        require(_value > 0 && _value <= balances[msg.sender]);

        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);

        emit Transfer(msg.sender, _to, _value);

        return true;
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
        require(_to != address(0));
        require(_value > 0 && _value <= balances[_from] && _value <= allowed[_from][msg.sender]);

        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);

        emit Transfer(_from, _to, _value);

        return true;
    }

    function approve(address _spender, uint256 _value) public returns (bool) {
        allowed[msg.sender][_spender] = _value;

        emit Approval(msg.sender, _spender, _value);

        return true;
    }

    function allowance(address _owner, address _spender) public view returns (uint256) {
        return allowed[_owner][_spender];
    }

    function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
        allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);

        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);

        return true;
    }

    function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
        uint oldValue = allowed[msg.sender][_spender];
        if (_subtractedValue > oldValue) {
            allowed[msg.sender][_spender] = 0;
        } else {
            allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
        }

        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);

        return true;
    }
}

contract Pausable is Ownable {
    event Pause();
    event Unpause();

    bool public paused = false;

    modifier whenNotPaused() {
        require(!paused);
        _;
    }

    modifier whenPaused() {
        require(paused);
        _;
    }

    function pause() onlyOwner whenNotPaused public {
        paused = true;
        emit Pause();
    }

    function unpause() onlyOwner whenPaused public {
        paused = false;
        emit Unpause();
    }
}

contract PausableToken is StandardToken, Pausable {
    function transfer(address _to, uint256 _value) whenNotPaused public returns (bool) {
        return super.transfer(_to, _value);
    }

    function transferFrom(address _from, address _to, uint256 _value) whenNotPaused public returns (bool) {
        return super.transferFrom(_from, _to, _value);
    }

    function approve(address _spender, uint256 _value) whenNotPaused public returns (bool) {
        return super.approve(_spender, _value);
    }

    function increaseApproval(address _spender, uint _addedValue) whenNotPaused public returns (bool success) {
        return super.increaseApproval(_spender, _addedValue);
    }

    function decreaseApproval(address _spender, uint _subtractedValue) whenNotPaused public returns (bool success) {
        return super.decreaseApproval(_spender, _subtractedValue);
    }
}

contract LemurToken is PausableToken {
    string public name = "Lemur Token";
    string public symbol = "LMR";
    uint8  public decimals = 18;

    uint256 public constant TOTAL_SUPPLY = 100000000 ether;
    uint256 public constant INITIAL_SUPPLY = 0;

    event Mint(address indexed _to, uint256 _amount);
    event Burn(address indexed _who, uint256 _value);

    constructor() public {
        totalSupply_ = INITIAL_SUPPLY;
        balances[msg.sender] = INITIAL_SUPPLY;
        emit Transfer(0x0, msg.sender, INITIAL_SUPPLY);
    }

    function mint(address _to, uint256 _value) onlyOwner whenNotPaused public returns (bool) {
        require(_to != address(0));
        require(_value > 0 && totalSupply_.add(_value) <= TOTAL_SUPPLY);

        totalSupply_ = totalSupply_.add(_value);
        balances[_to] = balances[_to].add(_value);

        emit Mint(_to, _value);
        emit Transfer(address(0), _to, _value);

        return true;
    }

    function burn(address _who, uint256 _value) onlyOwner whenNotPaused public returns (bool success) {
        require(_who != address(0));
        require(_value > 0 && _value <= balances[_who]);

        balances[_who] = balances[_who].sub(_value);
        totalSupply_ = totalSupply_.sub(_value);

        emit Burn(_who, _value);
        emit Transfer(_who, address(0), _value);

        return true;
    }

    function() payable public {
        revert();
    }
}