pragma solidity ^0.4.24;




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 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) internal balances;

  uint256 internal totalSupply_;

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

  
  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_value <= balances[msg.sender]);
    require(_to != address(0));

    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 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 StandardToken is ERC20, BasicToken {

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


  
  function transferFrom(
    address _from,
    address _to,
    uint256 _value
  )
    public
    returns (bool)
  {
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);
    require(_to != address(0));

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



contract PetlifeToken is MintableToken {
    string public constant name = "PetlifeToken";
    string public constant symbol = "Petl";
    uint8 public constant decimals = 18;
}




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 MintedCrowdsale is Crowdsale {

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




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(_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 FinalizableCrowdsale is Ownable, TimedCrowdsale {
  using SafeMath for uint256;

  bool public isFinalized = false;

  event Finalized();

  
  function finalize() public onlyOwner {
    require(!isFinalized);
    

    finalization();
    emit Finalized();

    isFinalized = true;
  }

  
  function finalization() internal {
  }

}



contract PetlifeCrowdsale is MintedCrowdsale, FinalizableCrowdsale {
 
  
  enum CrowdsaleStage { PrivateSale, ICOFirstStage, ICOSecondStage, ICOThirdStage }
  CrowdsaleStage public stage = CrowdsaleStage.PrivateSale;
  

  
  
  uint256 public privateCap = 30000000 * 10 ** 18;
  uint256 public firstStageCap = 25000000 * 10 ** 18;
  uint256 public secondStageCap = 20000000 * 10 ** 18;
  uint256 public thirdStageCap = 28000000 * 10 ** 18;
  uint256 public bonusPercent = 30;
  uint256 public saleCap = 103000000 * 10 ** 18;
  

  
  event EthTransferred(string text);
  event EthRefunded(string text);

  
  
  MintableToken public token;
  uint256 public mark;
  constructor(uint256 _openingTime, uint256 _closingTime, uint256 _rate, address _wallet, MintableToken _token) FinalizableCrowdsale() TimedCrowdsale(_openingTime, _closingTime) Crowdsale(_rate, _wallet, _token) public {
      token = _token;
      require(_wallet != 0x0);
  }
  


  
  
  

  
  function setCrowdsaleStage(uint value) public onlyOwner {
      CrowdsaleStage _stage;
      if (uint(CrowdsaleStage.PrivateSale) == value) {
        _stage = CrowdsaleStage.PrivateSale;
      } else if (uint(CrowdsaleStage.ICOFirstStage) == value) {
        _stage = CrowdsaleStage.ICOFirstStage;
      } else if (uint(CrowdsaleStage.ICOSecondStage) == value) {
        _stage = CrowdsaleStage.ICOSecondStage;
      } else if (uint(CrowdsaleStage.ICOThirdStage) == value) {
        _stage = CrowdsaleStage.ICOThirdStage;
      }
      stage = _stage;
      if (stage == CrowdsaleStage.PrivateSale) {
        setCurrentBonusPercent(30);
      } else if (stage == CrowdsaleStage.ICOFirstStage) {
        setCurrentBonusPercent(15);
      } else if (stage == CrowdsaleStage.ICOSecondStage) {
        setCurrentBonusPercent(5);
      } else if (stage == CrowdsaleStage.ICOThirdStage) {
        setCurrentBonusPercent(0);
      }
   }

  
  function setCurrentBonusPercent(uint256 _percent) private {
      bonusPercent = _percent;
  }

  

  
  
  function _getTokenAmount(uint256 _weiAmount)
    internal view returns (uint256)
  {
    return _weiAmount.mul(rate.mul(100+bonusPercent).div(100));
  }

  function () external payable {
      uint256 tokensThatWillBeMintedAfterPurchase = msg.value.mul(rate.mul(100+bonusPercent).div(100));
      
      if ((stage == CrowdsaleStage.PrivateSale) && (token.totalSupply() + tokensThatWillBeMintedAfterPurchase > privateCap)) {
        msg.sender.transfer(msg.value);
        emit EthRefunded("PrivateSale Limit Hit");
        return;
      }
      
      if ((stage == CrowdsaleStage.ICOFirstStage) && (token.totalSupply() + tokensThatWillBeMintedAfterPurchase > saleCap-thirdStageCap-secondStageCap)) {
        msg.sender.transfer(msg.value);
        emit EthRefunded("First Stage ICO Limit Hit");
        return;
      }
      
      if ((stage == CrowdsaleStage.ICOSecondStage) && (token.totalSupply() > saleCap-thirdStageCap)) {
        setCurrentBonusPercent(0);
      }
      
      if (token.totalSupply() + tokensThatWillBeMintedAfterPurchase > saleCap) {
        msg.sender.transfer(msg.value);
        emit EthRefunded("ICO Limit Hit");
        return;
      }
      
      buyTokens(msg.sender);
  }

  function forwardFunds() internal {
    wallet.transfer(msg.value);
    emit EthTransferred("forwarding funds to wallet");
  }
  
  
  

  function finish(address _teamFund, address _reserveFund, address _bountyFund, address _advisoryFund) public onlyOwner {
      require(!isFinalized);
      uint256 alreadyMinted = token.totalSupply();
      uint256 tokensForTeam = alreadyMinted.mul(15).div(100);
      uint256 tokensForBounty = alreadyMinted.mul(2).div(100);
      uint256 tokensForReserve = alreadyMinted.mul(175).div(1000);
      uint256 tokensForAdvisors = alreadyMinted.mul(35).div(1000);
      token.mint(_teamFund,tokensForTeam);
      token.mint(_bountyFund,tokensForBounty);
      token.mint(_reserveFund,tokensForReserve);
      token.mint(_advisoryFund,tokensForAdvisors);
      finalize();
  }
  
  
  
  
  function mintManually(address _to, uint256 _amount) public onlyOwner {
    require(!isFinalized);
    token.mint(_to,_amount*10**18);
  }
  
}