pragma solidity ^0.4.23;



contract Ownable {
  address public owner;


  event OwnershipRenounced(address indexed previousOwner);
  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );


  
  constructor() public {
    owner = msg.sender;
  }

  
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }

  
  function transferOwnership(address _newOwner) public onlyOwner {
    _transferOwnership(_newOwner);
  }

  
  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }
}




contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}




library Roles {
  struct Role {
    mapping (address => bool) bearer;
  }

  
  function add(Role storage role, address addr)
    internal
  {
    role.bearer[addr] = true;
  }

  
  function remove(Role storage role, address addr)
    internal
  {
    role.bearer[addr] = false;
  }

  
  function check(Role storage role, address addr)
    view
    internal
  {
    require(has(role, addr));
  }

  
  function has(Role storage role, address addr)
    view
    internal
    returns (bool)
  {
    return role.bearer[addr];
  }
}






contract RBAC {
  using Roles for Roles.Role;

  mapping (string => Roles.Role) private roles;

  event RoleAdded(address addr, string roleName);
  event RoleRemoved(address addr, string roleName);

  
  function checkRole(address addr, string roleName)
    view
    public
  {
    roles[roleName].check(addr);
  }

  
  function hasRole(address addr, string roleName)
    view
    public
    returns (bool)
  {
    return roles[roleName].has(addr);
  }

  
  function addRole(address addr, string roleName)
    internal
  {
    roles[roleName].add(addr);
    emit RoleAdded(addr, roleName);
  }

  
  function removeRole(address addr, string roleName)
    internal
  {
    roles[roleName].remove(addr);
    emit RoleRemoved(addr, roleName);
  }

  
  modifier onlyRole(string roleName)
  {
    checkRole(msg.sender, roleName);
    _;
  }

  
  
  
  
  
  
  
  
  

  

  
  
}










contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender)
    public view returns (uint256);

  function transferFrom(address from, address to, uint256 value)
    public returns (bool);

  function approve(address spender, uint256 value) public returns (bool);
  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}




contract DetailedERC20 is ERC20 {
  string public name;
  string public symbol;
  uint8 public decimals;

  constructor(string _name, string _symbol, uint8 _decimals) public {
    name = _name;
    symbol = _symbol;
    decimals = _decimals;
  }
}













library SafeMath {

  
  function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
    
    
    
    if (a == 0) {
      return 0;
    }

    c = a * b;
    assert(c / a == b);
    return c;
  }

  
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    
    
    
    return a / b;
  }

  
  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 c) {
    c = a + b;
    assert(c >= a);
    return c;
  }
}




contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  uint256 totalSupply_;

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

  
  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_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 balanceOf(address _owner) public view returns (uint256) {
    return balances[_owner];
  }

}





contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) internal allowed;


  
  function transferFrom(
    address _from,
    address _to,
    uint256 _value
  )
    public
    returns (bool)
  {
    require(_to != address(0));
    require(_value <= balances[_from]);
    require(_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, RBAC {

    string public constant ROLE_ADMINISTRATOR = "administrator";

    modifier whenNotPausedOrAuthorized() {
        require(!paused || hasRole(msg.sender, ROLE_ADMINISTRATOR));
        _;
    }
    
    function addAdministrator(address _administrator) onlyOwner public returns (bool) {
        if (isAdministrator(_administrator)) {
            return false;
        } else {
            addRole(_administrator, ROLE_ADMINISTRATOR);
            return true;
        }
    }

    
    function removeAdministrator(address _administrator) onlyOwner public returns (bool) {
        if (isAdministrator(_administrator)) {
            removeRole(_administrator, ROLE_ADMINISTRATOR);
            return true;
        } else {
            return false;
        }
    }

    
    function isAdministrator(address _administrator) public view returns (bool) {
        return hasRole(_administrator, ROLE_ADMINISTRATOR);
    }

    
    function transfer(address _to, uint256 _value) public whenNotPausedOrAuthorized returns (bool) {
        return super.transfer(_to, _value);
    }

    
    function transferFrom(address _from, address _to, uint256 _value) public whenNotPausedOrAuthorized returns (bool) {
        return super.transferFrom(_from, _to, _value);
    }
}


contract Level01Token is DetailedERC20, PausableToken {

    uint256 public initialTotalSupply;
    uint256 constant INITIAL_WHOLE_TOKENS = 12 * 10e7;

    constructor()
        public
        DetailedERC20("Level01 Token", "LVX", 18)
    {
        initialTotalSupply = INITIAL_WHOLE_TOKENS * uint256(10) ** decimals;
        totalSupply_ = initialTotalSupply;
        balances[msg.sender] = initialTotalSupply;
        emit Transfer(address(0), msg.sender, initialTotalSupply);
    }
}