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 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);
}


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
  );
}



library SafeERC20 {
  function safeTransfer(ERC20Basic token, address to, uint256 value) internal {
    require(token.transfer(to, value));
  }

  function safeTransferFrom(
    ERC20 token,
    address from,
    address to,
    uint256 value
  )
    internal
  {
    require(token.transferFrom(from, to, value));
  }

  function safeApprove(ERC20 token, address spender, uint256 value) internal {
    require(token.approve(spender, value));
  }
}



contract Crowdsale {
  using SafeMath for uint256;
  using SafeERC20 for ERC20;

  
  ERC20 public token;

  
  address public wallet;

  
  
  
  
  uint256 public rate;

  
  uint256 public weiRaised;

  
  event TokenPurchase(
    address indexed purchaser,
    address indexed beneficiary,
    uint256 value,
    uint256 amount
  );

  
  constructor(uint256 _rate, address _wallet, ERC20 _token) public {
    require(_rate > 0);
    require(_wallet != address(0));
    require(_token != address(0));

    rate = _rate;
    wallet = _wallet;
    token = _token;
  }

  
  
  

  
  function () external payable {
    buyTokens(msg.sender);
  }

  
  function buyTokens(address _beneficiary) public payable {

    uint256 weiAmount = msg.value;
    _preValidatePurchase(_beneficiary, weiAmount);

    
    uint256 tokens = _getTokenAmount(weiAmount);

    
    weiRaised = weiRaised.add(weiAmount);

    _processPurchase(_beneficiary, tokens);
    emit TokenPurchase(
      msg.sender,
      _beneficiary,
      weiAmount,
      tokens
    );

    _updatePurchasingState(_beneficiary, weiAmount);

    _forwardFunds();
    _postValidatePurchase(_beneficiary, weiAmount);
  }

  
  
  

  
  function _preValidatePurchase(
    address _beneficiary,
    uint256 _weiAmount
  )
    internal
  {
    require(_beneficiary != address(0));
    require(_weiAmount != 0);
  }

  
  function _postValidatePurchase(
    address _beneficiary,
    uint256 _weiAmount
  )
    internal
  {
    
  }

  
  function _deliverTokens(
    address _beneficiary,
    uint256 _tokenAmount
  )
    internal
  {
    token.safeTransfer(_beneficiary, _tokenAmount);
  }

  
  function _processPurchase(
    address _beneficiary,
    uint256 _tokenAmount
  )
    internal
  {
    _deliverTokens(_beneficiary, _tokenAmount);
  }

  
  function _updatePurchasingState(
    address _beneficiary,
    uint256 _weiAmount
  )
    internal
  {
    
  }

  
  function _getTokenAmount(uint256 _weiAmount)
    internal view returns (uint256)
  {
    return _weiAmount.mul(rate);
  }

  
  function _forwardFunds() internal {
    wallet.transfer(msg.value);
  }
}

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;
  }
}

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 indexed operator, string role);
  event RoleRemoved(address indexed operator, string role);

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

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

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

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

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

  
  
  
  
  
  
  
  
  

  

  
  
}


contract Superuser is Ownable, RBAC {
  string public constant ROLE_SUPERUSER = "superuser";

  constructor () public {
    addRole(msg.sender, ROLE_SUPERUSER);
  }

  
  modifier onlySuperuser() {
    checkRole(msg.sender, ROLE_SUPERUSER);
    _;
  }

  modifier onlyOwnerOrSuperuser() {
    require(msg.sender == owner || isSuperuser(msg.sender));
    _;
  }

  
  function isSuperuser(address _addr)
    public
    view
    returns (bool)
  {
    return hasRole(_addr, ROLE_SUPERUSER);
  }

  
  function transferSuperuser(address _newSuperuser) public onlySuperuser {
    require(_newSuperuser != address(0));
    removeRole(msg.sender, ROLE_SUPERUSER);
    addRole(_newSuperuser, ROLE_SUPERUSER);
  }

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



contract TimedCrowdsale is Crowdsale {
  using SafeMath for uint256;

  uint256 public openingTime;
  uint256 public closingTime;

  
  modifier onlyWhileOpen {
    
    require(block.timestamp >= openingTime && block.timestamp <= closingTime);
    _;
  }

  
  constructor(uint256 _openingTime, uint256 _closingTime) public {
    
    require(_openingTime >= block.timestamp);
    require(_closingTime >= _openingTime);

    openingTime = _openingTime;
    closingTime = _closingTime;
  }

  
  function hasClosed() public view returns (bool) {
    
    return block.timestamp > closingTime;
  }

  
  function _preValidatePurchase(
    address _beneficiary,
    uint256 _weiAmount
  )
    internal
    onlyWhileOpen
  {
    super._preValidatePurchase(_beneficiary, _weiAmount);
  }

}


contract Whitelist is Ownable, RBAC {
  string public constant ROLE_WHITELISTED = "whitelist";

  
  modifier onlyIfWhitelisted(address _operator) {
    checkRole(_operator, ROLE_WHITELISTED);
    _;
  }

  
  function addAddressToWhitelist(address _operator)
    onlyOwner
    public
  {
    addRole(_operator, ROLE_WHITELISTED);
  }

  
  function whitelist(address _operator)
    public
    view
    returns (bool)
  {
    return hasRole(_operator, ROLE_WHITELISTED);
  }

  
  function addAddressesToWhitelist(address[] _operators)
    onlyOwner
    public
  {
    for (uint256 i = 0; i < _operators.length; i++) {
      addAddressToWhitelist(_operators[i]);
    }
  }

  
  function removeAddressFromWhitelist(address _operator)
    onlyOwner
    public
  {
    removeRole(_operator, ROLE_WHITELISTED);
  }

  
  function removeAddressesFromWhitelist(address[] _operators)
    onlyOwner
    public
  {
    for (uint256 i = 0; i < _operators.length; i++) {
      removeAddressFromWhitelist(_operators[i]);
    }
  }

}



contract WhitelistedCrowdsale is Whitelist, Crowdsale {
  
  function _preValidatePurchase(
    address _beneficiary,
    uint256 _weiAmount
  )
    onlyIfWhitelisted(_beneficiary)
    internal
  {
    super._preValidatePurchase(_beneficiary, _weiAmount);
  }

}

contract CappedCrowdsale is Crowdsale {
  using SafeMath for uint256;

  uint256 public cap;

  
  constructor(uint256 _cap) public {
    require(_cap > 0);
    cap = _cap;
  }

  
  function capReached() public view returns (bool) {
    return weiRaised >= cap;
  }

  
  function _preValidatePurchase(
    address _beneficiary,
    uint256 _weiAmount
  )
    internal
  {
    super._preValidatePurchase(_beneficiary, _weiAmount);
    require(weiRaised.add(_weiAmount) <= cap);
  }

}

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,
    uint256 _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,
    uint256 _subtractedValue
  )
    public
    returns (bool)
  {
    uint256 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 MintableToken is StandardToken, Ownable {
  event Mint(address indexed to, uint256 amount);
  event MintFinished();

  bool public mintingFinished = false;


  modifier canMint() {
    require(!mintingFinished);
    _;
  }

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

  
  function mint(
    address _to,
    uint256 _amount
  )
    hasMintPermission
    canMint
    public
    returns (bool)
  {
    totalSupply_ = totalSupply_.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    emit Mint(_to, _amount);
    emit Transfer(address(0), _to, _amount);
    return true;
  }

  
  function finishMinting() onlyOwner canMint public returns (bool) {
    mintingFinished = true;
    emit MintFinished();
    return true;
  }
}



contract MintedCrowdsale is Crowdsale {

  
  function _deliverTokens(
    address _beneficiary,
    uint256 _tokenAmount
  )
    internal
  {
    require(MintableToken(token).mint(_beneficiary, _tokenAmount));
  }
}



contract CoinSmarttICO is TimedCrowdsale, WhitelistedCrowdsale, MintedCrowdsale, Superuser {

  uint256 public round;
  uint256 public lastRound;

	function CoinSmarttICO(uint256 _rate, 
    address _wallet, 
    ERC20 _token, 
    uint256 _openingTime, 
    uint256 _closingTime)
  TimedCrowdsale(_openingTime, _closingTime)
	Crowdsale(_rate, _wallet, _token)

	{
    round = 1;
    lastRound = 0;
	}

  function changeRound(uint256 deadline, uint256 cap, uint256 _rate, uint256 _newAmount) internal {
    
    if (now >= deadline || (_newAmount.sub(lastRound) >= cap)) {
      round += 1;
      lastRound = token.totalSupply();
      rate = _rate;
    }
  }

  function getRate(uint256 _newAmount) internal {
    if(round == 4) {
      
      
    } else if (round == 3) {
      
      changeRound(1547596800, 666666667 ether, 32481, _newAmount);
    } else if (round == 2) {
      changeRound(1543622400, 333333333 ether, 38977, _newAmount);
    } else if (round == 1) {
      changeRound(1539648000, 250000000 ether, 48721, _newAmount);
    }
  }
  function _preValidatePurchase(
    address _beneficiary,
    uint256 _weiAmount
  )
    internal
  {
    require(_getTokenAmount(_weiAmount).add(token.totalSupply()) < 3138888888 ether);
    getRate(_getTokenAmount(_weiAmount).add(token.totalSupply()));
    super._preValidatePurchase(_beneficiary, _weiAmount);
  }

  function bumpRound(uint256 _rate)
  onlyOwner
  {
    
    round += 1;
    lastRound = token.totalSupply();
    rate = _rate;
  }
}