/**
   * This smart contract code is Copyright 2017 TokenMarket Ltd. For more information see https://tokenmarket.net
   *
   * Licensed under the Apache License, version 2.0: https://github.com/TokenMarketNet/ico/blob/master/LICENSE.txt
   */

  pragma solidity ^0.4.18;

  /**
   * @title SafeMath
   * @dev Math operations with safety checks that throw on error
   */
  library SafeMath {

    /**
    * @dev Multiplies two numbers, throws on overflow.
    */
    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;
    }

    /**
    * @dev Integer division of two numbers, truncating the quotient.
    */
    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;
    }

    /**
    * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
      assert(b <= a);
      return a - b;
    }

    /**
    * @dev Adds two numbers, throws on overflow.
    */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
      uint256 c = a + b;
      assert(c >= a);
      return c;
    }
  }


  /**
   * Safe unsigned safe math.
   *
   * https://blog.aragon.one/library-driven-development-in-solidity-2bebcaf88736#.750gwtwli
   *
   * Originally from https://raw.githubusercontent.com/AragonOne/zeppelin-solidity/master/contracts/SafeMathLib.sol
   *
   * Maintained here until merged to mainline zeppelin-solidity.
   *
   */
  library SafeMathLib {

    function times(uint a, uint b) returns (uint) {
      uint c = a * b;
      assert(a == 0 || c / a == b);
      return c;
    }

    function minus(uint a, uint b) returns (uint) {
      assert(b <= a);
      return a - b;
    }

    function plus(uint a, uint b) returns (uint) {
      uint c = a + b;
      assert(c>=a);
      return c;
    }

  }


  /**
   * @title ERC20Basic
   * @dev Simpler version of ERC20 interface
   * @dev see https://github.com/ethereum/EIPs/issues/179
   */
  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);
  }


  /**
   * @title Basic token
   * @dev Basic version of StandardToken, with no allowances.
   */
  contract BasicToken is ERC20Basic {
    using SafeMath for uint256;

    mapping(address => uint256) balances;

    uint256 totalSupply_;

    /**
    * @dev total number of tokens in existence
    */
    function totalSupply() public view returns (uint256) {
      return totalSupply_;
    }

    /**
    * @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];
    }

    /**
     * @dev Increase the amount of tokens that an owner allowed to a 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
     * @param _spender The address which will spend the funds.
     * @param _addedValue The amount of tokens to increase the allowance by.
     */
    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;
    }

    /**
     * @dev Decrease the amount of tokens that an owner allowed to a spender.
     *
     * approve should be called when allowed[_spender] == 0. To decrement
     * allowed value is better to use this function to avoid 2 calls (and wait until
     * the first transaction is mined)
     * From MonolithDAO Token.sol
     * @param _spender The address which will spend the funds.
     * @param _subtractedValue The amount of tokens to decrease the allowance by.
     */
    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;
    }

  }


  /**
     @title ERC827 interface, an extension of ERC20 token standard

     Interface of a ERC827 token, following the ERC20 standard with extra
     methods to transfer value and data and execute calls in transfers and
     approvals.
   */
  contract ERC827 is ERC20 {

    function approve( address _spender, uint256 _value, bytes _data ) public returns (bool);
    function transfer( address _to, uint256 _value, bytes _data ) public returns (bool);
    function transferFrom( address _from, address _to, uint256 _value, bytes _data ) public returns (bool);

  }


  /**
     @title ERC827, an extension of ERC20 token standard

     Implementation the ERC827, following the ERC20 standard with extra
     methods to transfer value and data and execute calls in transfers and
     approvals.
     Uses OpenZeppelin StandardToken.
   */
  contract ERC827Token is ERC827, StandardToken {

    /**
       @dev Addition to ERC20 token methods. It allows to
       approve the transfer of value and execute a call with the sent data.

       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 that will spend the funds.
       @param _value The amount of tokens to be spent.
       @param _data ABI-encoded contract call to call `_to` address.

       @return true if the call function was executed successfully
     */
    function approve(address _spender, uint256 _value, bytes _data) public returns (bool) {
      require(_spender != address(this));

      super.approve(_spender, _value);

      require(_spender.call(_data));

      return true;
    }

    /**
       @dev Addition to ERC20 token methods. Transfer tokens to a specified
       address and execute a call with the sent data on the same transaction

       @param _to address The address which you want to transfer to
       @param _value uint256 the amout of tokens to be transfered
       @param _data ABI-encoded contract call to call `_to` address.

       @return true if the call function was executed successfully
     */
    function transfer(address _to, uint256 _value, bytes _data) public returns (bool) {
      require(_to != address(this));

      super.transfer(_to, _value);

      require(_to.call(_data));
      return true;
    }

    /**
       @dev Addition to ERC20 token methods. Transfer tokens from one address to
       another and make a contract call on the same transaction

       @param _from The address which you want to send tokens from
       @param _to The address which you want to transfer to
       @param _value The amout of tokens to be transferred
       @param _data ABI-encoded contract call to call `_to` address.

       @return true if the call function was executed successfully
     */
    function transferFrom(address _from, address _to, uint256 _value, bytes _data) public returns (bool) {
      require(_to != address(this));

      super.transferFrom(_from, _to, _value);

      require(_to.call(_data));
      return true;
    }

    /**
     * @dev Addition to StandardToken methods. Increase the amount of tokens that
     * an owner allowed to a spender and execute a call with the sent data.
     *
     * 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
     * @param _spender The address which will spend the funds.
     * @param _addedValue The amount of tokens to increase the allowance by.
     * @param _data ABI-encoded contract call to call `_spender` address.
     */
    function increaseApproval(address _spender, uint _addedValue, bytes _data) public returns (bool) {
      require(_spender != address(this));

      super.increaseApproval(_spender, _addedValue);

      require(_spender.call(_data));

      return true;
    }

    /**
     * @dev Addition to StandardToken methods. Decrease the amount of tokens that
     * an owner allowed to a spender and execute a call with the sent data.
     *
     * approve should be called when allowed[_spender] == 0. To decrement
     * allowed value is better to use this function to avoid 2 calls (and wait until
     * the first transaction is mined)
     * From MonolithDAO Token.sol
     * @param _spender The address which will spend the funds.
     * @param _subtractedValue The amount of tokens to decrease the allowance by.
     * @param _data ABI-encoded contract call to call `_spender` address.
     */
    function decreaseApproval(address _spender, uint _subtractedValue, bytes _data) public returns (bool) {
      require(_spender != address(this));

      super.decreaseApproval(_spender, _subtractedValue);

      require(_spender.call(_data));

      return true;
    }

  }


  /**
   * @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;
    }

  }


  contract Recoverable is Ownable {

    /// @dev Empty constructor (for now)
    function Recoverable() {
    }

    /// @dev This will be invoked by the owner, when owner wants to rescue tokens
    /// @param token Token which will we rescue to the owner from the contract
    function recoverTokens(ERC20Basic token) onlyOwner public {
      token.transfer(owner, tokensToBeReturned(token));
    }

    /// @dev Interface function, can be overwritten by the superclass
    /// @param token Token which balance we will check and return
    /// @return The amount of tokens (in smallest denominator) the contract owns
    function tokensToBeReturned(ERC20Basic token) public returns (uint) {
      return token.balanceOf(this);
    }
  }


  /**
   * Standard EIP-20 token with an interface marker.
   *
   * @notice Interface marker is used by crowdsale contracts to validate that addresses point a good token contract.
   *
   */
  contract StandardTokenExt is StandardToken, ERC827Token, Recoverable {

    /* Interface declaration */
    function isToken() public constant returns (bool weAre) {
      return true;
    }
  }

  /**
   * Hold tokens for a group investor of investors until the unlock date.
   *
   * After the unlock date the investor can claim their tokens.
   *
   * Steps
   *
   * - Deploy this contract
   * - Move tokensToBeAllocated to this contract using StandardToken.transfer()
   * - Call setInvestor for all investors from the owner account using a local script and CSV input
   * - Wait until the freeze period is over
   * - After the freeze time is over investors can call claim() from their address to get their tokens
   *
   */
  contract InvestorTimeVault is Ownable {
    using SafeMathLib for uint;

    /** How many investors we have now */
    uint public investorCount;

    /** How many tokens investors have claimed so far */
    uint public totalClaimed;

    /** How many tokens our internal book keeping tells us to have at the time of lock() when all investor data has been loaded */
    uint public tokensAllocatedTotal;

    /** How much we have allocated to the investors invested */
    mapping(address => uint) public balances;

    /** How many tokens investors have claimed */
    mapping(address => uint) public claimed;

    /** When our claim freeze is over (UNIX timestamp) */
    mapping(address => uint) public freezeEndsAt;

    /** We can also define our own token, which will override the ICO one ***/
    StandardTokenExt public token;

    /** We allocated tokens for investor */
    event Allocated(address investor, uint value);

    /** We distributed tokens to an investor */
    event Distributed(address investors, uint count);

    /**
     * Create contract for presale investors where tokens will be locked for a period of time
     *
     * @param _owner Who can load investor data and lock
     * @param _token Token contract address we are distributing
     *
     */
    function InvestorTimeVault(address _owner, address _token) {

      owner = _owner;

      // Invalid owenr
      if(owner == 0) {
        throw;
      }

      token = StandardTokenExt(_token);

      // Check the address looks like a token contract
      if(!token.isToken()) {
        throw;
      }

    }

    /// @dev Add a presale participating allocation
    function setInvestor(address investor, uint _freezeEndsAt, uint amount) public onlyOwner {

      uint tokensTotal = (token.balanceOf(address(this))).plus(totalClaimed);
      uint unallocatedTokens = tokensTotal.minus(tokensAllocatedTotal); // Tokens we have in vault with no owner set

      if(amount == 0) throw; // No empty buys

      if(amount > unallocatedTokens) throw; // Can not lock tokens the vault don't have

      if(now > _freezeEndsAt) throw; // Trying to lock for negative period of time

      // Don't allow reset
      if(balances[investor] > 0) {
        throw;
      }

      balances[investor] = amount;
      freezeEndsAt[investor] = _freezeEndsAt;

      investorCount++;

      tokensAllocatedTotal = tokensAllocatedTotal.plus(amount);

      Allocated(investor, amount);
    }

    /// @dev Get the current balance of tokens in the vault
    /// @return uint How many tokens there are currently in vault
    function getBalance() public constant returns (uint howManyTokensCurrentlyInVault) {
      return token.balanceOf(address(this));
    }

    /// @dev Claim N bought tokens to the investor as the msg sender
    function claim() {

      address investor = msg.sender;

      if(balances[investor] == 0) {
        // Not our investor
        throw;
      }

      if(now < freezeEndsAt[investor]) {
        throw; // Trying to claim early
      }

      uint amount = balances[investor];

      balances[investor] = 0;

      claimed[investor] = claimed[investor].plus(amount);

      totalClaimed = totalClaimed.plus(amount);

      token.transfer(investor, amount);

      Distributed(investor, amount);
    }

  }