// Vulnerability label: TD1
pragma solidity ^0.4.18;


/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


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


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() public {
    owner = msg.sender;
  }


  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }


  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}


/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  uint256 public totalSupply;
  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);
}


/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    if (a == 0) {
      return 0;
    }
    uint256 c = a * b;
    assert(c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  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) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}


/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  /**
  * @dev transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);

    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) public view returns (uint256 balance) {
    return balances[_owner];
  }

}


/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
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);
}



/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is ERC20, BasicToken {

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


  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint256 the amount of tokens to be transferred
   */
  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);
    Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   *
   * Beware that changing an allowance with this method brings the risk that someone may use both the old
   * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
   * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(address _owner, address _spender) public view returns (uint256) {
    return allowed[_owner][_spender];
  }

  /**
   * approve should be called when allowed[_spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   */
  function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    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);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}


contract KITToken is StandardToken, Ownable {

  using SafeMath for uint256;

  event Mint(address indexed to, uint256 amount);

  event MintFinished();

  string public constant name = 'KIT';

  string public constant symbol = 'KIT';

  uint32 public constant decimals = 18;

  bool public mintingFinished = false;

  address public saleAgent;

  modifier notLocked() {
    require(msg.sender == owner || msg.sender == saleAgent || mintingFinished);
    _;
  }

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

  function transferFrom(address from, address to, uint256 value) public notLocked returns (bool) {
    return super.transferFrom(from, to, value);
  }

  function setSaleAgent(address newSaleAgent) public {
    require(saleAgent == msg.sender || owner == msg.sender);
    saleAgent = newSaleAgent;
  }

  function mint(address _to, uint256 _amount) public returns (bool) {
    require(!mintingFinished);
    require(msg.sender == saleAgent);
    totalSupply = totalSupply.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    Mint(_to, _amount);
    Transfer(address(0), _to, _amount);
    return true;
  }

  function finishMinting() public returns (bool) {
    require(!mintingFinished);
    require(msg.sender == owner || msg.sender == saleAgent);
    mintingFinished = true;
    MintFinished();
    return true;
  }

}


contract LockableChanges is Ownable {

  bool public changesLocked;

  modifier notLocked() {
    require(!changesLocked);
    _;
  }

  function lockChanges() public onlyOwner {
    changesLocked = true;
  }

}


contract CommonCrowdsale is Ownable, LockableChanges {

  using SafeMath for uint256;

  uint public constant PERCENT_RATE = 100;

  uint public price;

  uint public minInvestedLimit;

  uint public hardcap;

  uint public start;

  uint public end;

  uint public invested;

  uint public minted;

  address public wallet;

  address public bountyTokensWallet;

  address public devTokensWallet;

  address public advisorsTokensWallet;

  address public foundersTokensWallet;

  uint public bountyTokensPercent;

  uint public devTokensPercent;

  uint public advisorsTokensPercent;

  uint public foundersTokensPercent;

  address public directMintAgent;

  struct Bonus {
    uint periodInDays;
    uint bonus;
  }

  Bonus[] public bonuses;

  KITToken public token;

  modifier saleIsOn() {
    require(msg.value >= minInvestedLimit && now >= start && now < end && invested < hardcap);
    _;
  }

  function setHardcap(uint newHardcap) public onlyOwner {
    hardcap = newHardcap;
  }

  function setStart(uint newStart) public onlyOwner {
    start = newStart;
  }

  function setBountyTokensPercent(uint newBountyTokensPercent) public onlyOwner {
    bountyTokensPercent = newBountyTokensPercent;
  }

  function setAdvisorsTokensPercent(uint newAdvisorsTokensPercent) public onlyOwner {
    advisorsTokensPercent = newAdvisorsTokensPercent;
  }

  function setDevTokensPercent(uint newDevTokensPercent) public onlyOwner {
    devTokensPercent = newDevTokensPercent;
  }

  function setFoundersTokensPercent(uint newFoundersTokensPercent) public onlyOwner {
    foundersTokensPercent = newFoundersTokensPercent;
  }

  function setBountyTokensWallet(address newBountyTokensWallet) public onlyOwner {
    bountyTokensWallet = newBountyTokensWallet;
  }

  function setAdvisorsTokensWallet(address newAdvisorsTokensWallet) public onlyOwner {
    advisorsTokensWallet = newAdvisorsTokensWallet;
  }

  function setDevTokensWallet(address newDevTokensWallet) public onlyOwner {
    devTokensWallet = newDevTokensWallet;
  }

  function setFoundersTokensWallet(address newFoundersTokensWallet) public onlyOwner {
    foundersTokensWallet = newFoundersTokensWallet;
  }

  function setEnd(uint newEnd) public onlyOwner {
    require(start < newEnd);
    end = newEnd;
  }

  function setToken(address newToken) public onlyOwner {
    token = KITToken(newToken);
  }

  function setWallet(address newWallet) public onlyOwner {
    wallet = newWallet;
  }

  function setPrice(uint newPrice) public onlyOwner {
    price = newPrice;
  }

  function setMinInvestedLimit(uint newMinInvestedLimit) public onlyOwner {
    minInvestedLimit = newMinInvestedLimit;
  }

  function bonusesCount() public constant returns(uint) {
    return bonuses.length;
  }

  function addBonus(uint limit, uint bonus) public onlyOwner {
    bonuses.push(Bonus(limit, bonus));
  }

  modifier onlyDirectMintAgentOrOwner() {
    require(directMintAgent == msg.sender || owner == msg.sender);
    _;
  }

  function setDirectMintAgent(address newDirectMintAgent) public onlyOwner {
    directMintAgent = newDirectMintAgent;
  }

  function directMint(address to, uint investedWei) public onlyDirectMintAgentOrOwner saleIsOn {
    calculateAndTransferTokens(to, investedWei);
  }

  function mintExtendedTokens() internal {
    uint extendedTokensPercent = bountyTokensPercent.add(devTokensPercent).add(advisorsTokensPercent).add(foundersTokensPercent);
    uint extendedTokens = minted.mul(extendedTokensPercent).div(PERCENT_RATE.sub(extendedTokensPercent));
    uint summaryTokens = extendedTokens.add(minted);

    uint bountyTokens = summaryTokens.mul(bountyTokensPercent).div(PERCENT_RATE);
    mintAndSendTokens(bountyTokensWallet, bountyTokens);

    uint advisorsTokens = summaryTokens.mul(advisorsTokensPercent).div(PERCENT_RATE);
    mintAndSendTokens(advisorsTokensWallet, advisorsTokens);

    uint foundersTokens = summaryTokens.mul(foundersTokensPercent).div(PERCENT_RATE);
    mintAndSendTokens(foundersTokensWallet, foundersTokens);

    uint devTokens = extendedTokens.sub(bountyTokens).sub(advisorsTokens).sub(foundersTokens);
    mintAndSendTokens(devTokensWallet, devTokens);
  }

  function mintAndSendTokens(address to, uint amount) internal {
    token.mint(to, amount);
    minted = minted.add(amount);
  }

  function calculateAndTransferTokens(address to, uint investedInWei) internal {
    // update invested value
    invested = invested.add(investedInWei);

    // calculate tokens
    uint tokens = msg.value.mul(price).div(1 ether);
    uint bonus = getBonus();
    if (bonus > 0) {
      tokens = tokens.add(tokens.mul(bonus).div(100));
    }

    // transfer tokens
    mintAndSendTokens(to, tokens);
  }

  function getBonus() public constant returns(uint) {
    uint prevTimeLimit = start;
    for (uint i = 0; i < bonuses.length; i++) {
      Bonus storage bonus = bonuses[i];
      prevTimeLimit += bonus.periodInDays * 1 days;
      if (now < prevTimeLimit)
        return bonus.bonus;
    }
    return 0;
  }

  function createTokens() public payable;

  function() external payable {
    createTokens();
  }

  function retrieveTokens(address anotherToken) public onlyOwner {
    ERC20 alienToken = ERC20(anotherToken);
    alienToken.transfer(wallet, alienToken.balanceOf(this));
  }

}


contract Presale is CommonCrowdsale {

  uint public devLimit;

  uint public softcap;

  bool public refundOn;

  bool public softcapAchieved;

  bool public devWithdrawn;

  address public devWallet;

  address public nextSaleAgent;

  mapping (address => uint) public balances;

  function Presale() public {
    minInvestedLimit = 10000000000000000;
    price = 1000000000000000000000;
    bountyTokensPercent = 3;
    advisorsTokensPercent = 1;
    devTokensPercent = 4;
    foundersTokensPercent = 10;
    softcap = 20000000000000000000;
    hardcap = 63000000000000000000000;
    addBonus(7,42);
    addBonus(7,25);
    addBonus(7,11);
    start = 1513774800;
    end = 1516885200;
    devLimit = 7000000000000000000;
    wallet = 0x72EcAEB966176c50CfFc0Db53E4A2D3DbC0d538B;
    devWallet = 0xEA15Adb66DC92a4BbCcC8Bf32fd25E2e86a2A770;
    bountyTokensWallet = 0x7E513B54e3a45B60d6f92c6CECE10C68977EEA8c;
    foundersTokensWallet = 0x4227859C5A9Bb4391Cc4735Aa655e980a3DD4380;
    advisorsTokensWallet = 0x6e740ef8618A7d822238F867c622373Df8B54a22;
    devTokensWallet = 0xCaDca9387E12F55997F46870DA28F0af1626A6d4;
  }

  function setNextSaleAgent(address newNextSaleAgent) public onlyOwner {
    nextSaleAgent = newNextSaleAgent;
  }

  function setSoftcap(uint newSoftcap) public onlyOwner {
    softcap = newSoftcap;
  }

  function setDevWallet(address newDevWallet) public onlyOwner notLocked {
    devWallet = newDevWallet;
  }

  function setDevLimit(uint newDevLimit) public onlyOwner notLocked {
    devLimit = newDevLimit;
  }

  function refund() public {
    require(now > start && refundOn && balances[msg.sender] > 0);
    uint value = balances[msg.sender];
    balances[msg.sender] = 0;
    msg.sender.transfer(value);
  }

  function createTokens() public payable saleIsOn {
    balances[msg.sender] = balances[msg.sender].add(msg.value);
    calculateAndTransferTokens(msg.sender, msg.value);
    if (!softcapAchieved && invested >= softcap) {
      softcapAchieved = true;
    }
  }

  function withdrawDev() public {
    require(softcapAchieved);
    require(devWallet == msg.sender || owner == msg.sender);
    if (!devWithdrawn) {
      devWithdrawn = true;
      devWallet.transfer(devLimit);
    }
  }

  function withdraw() public {
    require(softcapAchieved);
    require(owner == msg.sender);
    withdrawDev();
    wallet.transfer(this.balance);
  }

  function finishMinting() public onlyOwner {
    if (!softcapAchieved) {
      refundOn = true;
      token.finishMinting();
    } else {
      mintExtendedTokens();
      token.setSaleAgent(nextSaleAgent);
    }
  }

}