pragma solidity ^0.4.24;

/**
 * @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 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 c) {
    // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (a == 0) {
      return 0;
    }

    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 a / b;
  }

  /**
  * @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 c) {
    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;

  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]);

    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    emit 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) {
    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);
    emit 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;
    emit 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));
    emit 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);
    }
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

/**
 * @title DetailedERC20 token
 * @dev The decimals are only for visualization purposes.
 * All the operations are done using the smallest and indivisible token unit,
 * just as on Ethereum all the operations are done in wei.
 */
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;
  }
}

/**
 * @title Interface for the ST20 token standard
 */
contract IST20 is StandardToken, DetailedERC20 {

    // off-chain hash
    string public tokenDetails;

    //transfer, transferFrom must respect use respect the result of verifyTransfer
    function verifyTransfer(address _from, address _to, uint256 _amount) public returns (bool success);

    /**
     * @notice mints new tokens and assigns them to the target _investor.
     * Can only be called by the STO attached to the token (Or by the ST owner if there's no STO attached yet)
     */
    function mint(address _investor, uint256 _amount) public returns (bool success);

    /**
     * @notice Burn function used to burn the securityToken
     * @param _value No. of token that get burned
     */
    function burn(uint256 _value) public;

    event Minted(address indexed to, uint256 amount);
    event Burnt(address indexed _burner, uint256 _value);

}

/**
 * @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 OwnershipRenounced(address indexed previousOwner);
  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() 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 relinquish control of the contract.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }

  /**
   * @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 {
    _transferOwnership(_newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }
}

/**
 * @title Interface for all security tokens
 */
contract ISecurityToken is IST20, Ownable {

    uint8 public constant PERMISSIONMANAGER_KEY = 1;
    uint8 public constant TRANSFERMANAGER_KEY = 2;
    uint8 public constant STO_KEY = 3;
    uint8 public constant CHECKPOINT_KEY = 4;
    uint256 public granularity;

    // Value of current checkpoint
    uint256 public currentCheckpointId;

    // Total number of non-zero token holders
    uint256 public investorCount;

    // List of token holders
    address[] public investors;

    // Permissions this to a Permission module, which has a key of 1
    // If no Permission return false - note that IModule withPerm will allow ST owner all permissions anyway
    // this allows individual modules to override this logic if needed (to not allow ST owner all permissions)
    function checkPermission(address _delegate, address _module, bytes32 _perm) public view returns(bool);

    /**
     * @notice returns module list for a module type
     * @param _moduleType is which type of module we are trying to remove
     * @param _moduleIndex is the index of the module within the chosen type
     */
    function getModule(uint8 _moduleType, uint _moduleIndex) public view returns (bytes32, address);

    /**
     * @notice returns module list for a module name - will return first match
     * @param _moduleType is which type of module we are trying to remove
     * @param _name is the name of the module within the chosen type
     */
    function getModuleByName(uint8 _moduleType, bytes32 _name) public view returns (bytes32, address);

    /**
     * @notice Queries totalSupply as of a defined checkpoint
     * @param _checkpointId Checkpoint ID to query as of
     */
    function totalSupplyAt(uint256 _checkpointId) public view returns(uint256);

    /**
     * @notice Queries balances as of a defined checkpoint
     * @param _investor Investor to query balance for
     * @param _checkpointId Checkpoint ID to query as of
     */
    function balanceOfAt(address _investor, uint256 _checkpointId) public view returns(uint256);

    /**
     * @notice Creates a checkpoint that can be used to query historical balances / totalSuppy
     */
    function createCheckpoint() public returns(uint256);

    /**
     * @notice gets length of investors array
     * NB - this length may differ from investorCount if list has not been pruned of zero balance investors
     * @return length
     */
    function getInvestorsLength() public view returns(uint256);

}

/**
 * @title Interface that any module factory contract should implement
 */
contract IModuleFactory is Ownable {

    ERC20 public polyToken;
    uint256 public setupCost;
    uint256 public usageCost;
    uint256 public monthlySubscriptionCost;

    event LogChangeFactorySetupFee(uint256 _oldSetupcost, uint256 _newSetupCost, address _moduleFactory);
    event LogChangeFactoryUsageFee(uint256 _oldUsageCost, uint256 _newUsageCost, address _moduleFactory);
    event LogChangeFactorySubscriptionFee(uint256 _oldSubscriptionCost, uint256 _newMonthlySubscriptionCost, address _moduleFactory);
    event LogGenerateModuleFromFactory(address _module, bytes32 indexed _moduleName, address indexed _moduleFactory, address _creator, uint256 _timestamp);

    /**
     * @notice Constructor
     * @param _polyAddress Address of the polytoken
     */
    constructor (address _polyAddress, uint256 _setupCost, uint256 _usageCost, uint256 _subscriptionCost) public {
      polyToken = ERC20(_polyAddress);
      setupCost = _setupCost;
      usageCost = _usageCost;
      monthlySubscriptionCost = _subscriptionCost;
    }

    //Should create an instance of the Module, or throw
    function deploy(bytes _data) external returns(address);

    /**
     * @notice Type of the Module factory
     */
    function getType() public view returns(uint8);

    /**
     * @notice Get the name of the Module
     */
    function getName() public view returns(bytes32);

    /**
     * @notice Get the description of the Module
     */
    function getDescription() public view returns(string);

    /**
     * @notice Get the title of the Module
     */
    function getTitle() public view returns(string);

    /**
     * @notice Get the Instructions that helped to used the module
     */
    function getInstructions() public view returns (string);

    /**
     * @notice Get the tags related to the module factory
     */
    function getTags() public view returns (bytes32[]);

    //Pull function sig from _data
    function getSig(bytes _data) internal pure returns (bytes4 sig) {
        uint len = _data.length < 4 ? _data.length : 4;
        for (uint i = 0; i < len; i++) {
            sig = bytes4(uint(sig) + uint(_data[i]) * (2 ** (8 * (len - 1 - i))));
        }
    }

    /**
     * @notice used to change the fee of the setup cost
     * @param _newSetupCost new setup cost
     */
    function changeFactorySetupFee(uint256 _newSetupCost) public onlyOwner {
        emit LogChangeFactorySetupFee(setupCost, _newSetupCost, address(this));
        setupCost = _newSetupCost;
    }

    /**
     * @notice used to change the fee of the usage cost
     * @param _newUsageCost new usage cost
     */
    function changeFactoryUsageFee(uint256 _newUsageCost) public onlyOwner {
        emit LogChangeFactoryUsageFee(usageCost, _newUsageCost, address(this));
        usageCost = _newUsageCost;
    }

    /**
     * @notice used to change the fee of the subscription cost
     * @param _newSubscriptionCost new subscription cost
     */
    function changeFactorySubscriptionFee(uint256 _newSubscriptionCost) public onlyOwner {
        emit LogChangeFactorySubscriptionFee(monthlySubscriptionCost, _newSubscriptionCost, address(this));
        monthlySubscriptionCost = _newSubscriptionCost;
        
    }

}

/**
 * @title Interface that any module contract should implement
 */
contract IModule {

    address public factory;

    address public securityToken;

    bytes32 public constant FEE_ADMIN = "FEE_ADMIN";

    ERC20 public polyToken;

    /**
     * @notice Constructor
     * @param _securityToken Address of the security token
     * @param _polyAddress Address of the polytoken
     */
    constructor (address _securityToken, address _polyAddress) public {
        securityToken = _securityToken;
        factory = msg.sender;
        polyToken = ERC20(_polyAddress);
    }

    /**
     * @notice This function returns the signature of configure function
     */
    function getInitFunction() public pure returns (bytes4);

    //Allows owner, factory or permissioned delegate
    modifier withPerm(bytes32 _perm) {
        bool isOwner = msg.sender == ISecurityToken(securityToken).owner();
        bool isFactory = msg.sender == factory;
        require(isOwner||isFactory||ISecurityToken(securityToken).checkPermission(msg.sender, address(this), _perm), "Permission check failed");
        _;
    }

    modifier onlyOwner {
        require(msg.sender == ISecurityToken(securityToken).owner(), "Sender is not owner");
        _;
    }

    modifier onlyFactory {
        require(msg.sender == factory, "Sender is not factory");
        _;
    }

    modifier onlyFactoryOwner {
        require(msg.sender == IModuleFactory(factory).owner(), "Sender is not factory owner");
        _;
    }

    /**
     * @notice Return the permissions flag that are associated with Module
     */
    function getPermissions() public view returns(bytes32[]);

    /**
     * @notice used to withdraw the fee by the factory owner
     */
    function takeFee(uint256 _amount) public withPerm(FEE_ADMIN) returns(bool) {
        require(polyToken.transferFrom(address(this), IModuleFactory(factory).owner(), _amount), "Unable to take fee");
        return true;
    }
}

/**
 * @title Interface to be implemented by all checkpoint modules
 */
contract ICheckpoint is IModule {

}

/**
 * @title Math
 * @dev Assorted math operations
 */
library Math {
  function max64(uint64 a, uint64 b) internal pure returns (uint64) {
    return a >= b ? a : b;
  }

  function min64(uint64 a, uint64 b) internal pure returns (uint64) {
    return a < b ? a : b;
  }

  function max256(uint256 a, uint256 b) internal pure returns (uint256) {
    return a >= b ? a : b;
  }

  function min256(uint256 a, uint256 b) internal pure returns (uint256) {
    return a < b ? a : b;
  }
}

/////////////////////
// Module permissions
/////////////////////
//                                        Owner       DISTRIBUTE
// pushDividendPaymentToAddresses           X               X
// pushDividendPayment                      X               X
// createDividend                           X
// createDividendWithCheckpoint             X
// reclaimDividend                          X

/**
 * @title Checkpoint module for issuing ERC20 dividends
 */
contract ERC20DividendCheckpoint is ICheckpoint {
    using SafeMath for uint256;

    bytes32 public constant DISTRIBUTE = "DISTRIBUTE";

    struct Dividend {
      uint256 checkpointId;
      uint256 created; // Time at which the dividend was created
      uint256 maturity; // Time after which dividend can be claimed - set to 0 to bypass
      uint256 expiry;  // Time until which dividend can be claimed - after this time any remaining amount can be withdrawn by issuer - set to very high value to bypass
      address token; // Address of ERC20 token that dividend is denominated in
      uint256 amount; // Dividend amount in base token amounts
      uint256 claimedAmount; // Amount of dividend claimed so far
      uint256 totalSupply; // Total supply at the associated checkpoint (avoids recalculating this)
      bool reclaimed;
      mapping (address => bool) claimed; // List of addresses which have claimed dividend
    }

    // List of all dividends
    Dividend[] public dividends;

    event ERC20DividendDeposited(address indexed _depositor, uint256 _checkpointId, uint256 _created, uint256 _maturity, uint256 _expiry, address _token, uint256 _amount, uint256 _totalSupply, uint256 _dividendIndex);
    event ERC20DividendClaimed(address indexed _payee, uint256 _dividendIndex, address _token, uint256 _amount);
    event ERC20DividendReclaimed(address indexed _claimer, uint256 _dividendIndex, address _token, uint256 _claimedAmount);

    modifier validDividendIndex(uint256 _dividendIndex) {
        require(_dividendIndex < dividends.length, "Incorrect dividend index");
        require(now >= dividends[_dividendIndex].maturity, "Dividend maturity is in the future");
        require(now < dividends[_dividendIndex].expiry, "Dividend expiry is in the past");
        require(!dividends[_dividendIndex].reclaimed, "Dividend has been reclaimed by issuer");
        _;
    }

    /**
     * @notice Constructor
     * @param _securityToken Address of the security token
     * @param _polyAddress Address of the polytoken
     */
    constructor (address _securityToken, address _polyAddress) public
    IModule(_securityToken, _polyAddress)
    {
    }

    /**
    * @notice Init function i.e generalise function to maintain the structure of the module contract
    * @return bytes4
    */
    function getInitFunction() public pure returns (bytes4) {
        return bytes4(0);
    }

    /**
     * @notice Creates a dividend and checkpoint for the dividend
     * @param _maturity Time from which dividend can be paid
     * @param _expiry Time until dividend can no longer be paid, and can be reclaimed by issuer
     * @param _token Address of ERC20 token in which dividend is to be denominated
     * @param _amount Amount of specified token for dividend
     */
    function createDividend(uint256 _maturity, uint256 _expiry, address _token, uint256 _amount) public onlyOwner {
        require(_expiry > _maturity);
        require(_expiry > now);
        require(_token != address(0));
        require(_amount > 0);
        require(ERC20(_token).transferFrom(msg.sender, address(this), _amount), "Unable to transfer tokens for dividend");
        uint256 dividendIndex = dividends.length;
        uint256 checkpointId = ISecurityToken(securityToken).createCheckpoint();
        uint256 currentSupply = ISecurityToken(securityToken).totalSupply();
        dividends.push(
          Dividend(
            checkpointId,
            now,
            _maturity,
            _expiry,
            _token,
            _amount,
            0,
            currentSupply,
            false
          )
        );
        emit ERC20DividendDeposited(msg.sender, checkpointId, now, _maturity, _expiry, _token, _amount, currentSupply, dividendIndex);
    }

    /**
     * @notice Creates a dividend with a provided checkpoint
     * @param _maturity Time from which dividend can be paid
     * @param _expiry Time until dividend can no longer be paid, and can be reclaimed by issuer
     * @param _token Address of ERC20 token in which dividend is to be denominated
     * @param _amount Amount of specified token for dividend
     * @param _checkpointId Checkpoint id from which to create dividends
     */
    function createDividendWithCheckpoint(uint256 _maturity, uint256 _expiry, address _token, uint256 _amount, uint256 _checkpointId) payable public onlyOwner {
        require(_expiry > _maturity);
        require(_expiry > now);
        require(_checkpointId <= ISecurityToken(securityToken).currentCheckpointId());
        uint256 dividendIndex = dividends.length;
        uint256 currentSupply = ISecurityToken(securityToken).totalSupplyAt(_checkpointId);
        require(ERC20(_token).transferFrom(msg.sender, address(this), _amount), "Unable to transfer tokens for dividend");
        dividends.push(
          Dividend(
            _checkpointId,
            now,
            _maturity,
            _expiry,
            _token,
            _amount,
            0,
            currentSupply,
            false
          )
        );
        emit ERC20DividendDeposited(msg.sender, _checkpointId, now, _maturity, _expiry, _token, _amount, currentSupply, dividendIndex);
    }

    /**
     * @notice Issuer can push dividends to provided addresses
     * @param _dividendIndex Dividend to push
     * @param _payees Addresses to which to push the dividend
     */
    function pushDividendPaymentToAddresses(uint256 _dividendIndex, address[] _payees) public withPerm(DISTRIBUTE) validDividendIndex(_dividendIndex) {
        Dividend storage dividend = dividends[_dividendIndex];
        for (uint256 i = 0; i < _payees.length; i++) {
            if (!dividend.claimed[_payees[i]]) {
                _payDividend(_payees[i], dividend, _dividendIndex);
            }
        }
    }

    /**
     * @notice Issuer can push dividends using the investor list from the security token
     * @param _dividendIndex Dividend to push
     * @param _start Index in investor list at which to start pushing dividends
     * @param _iterations Number of addresses to push dividends for
     */
    function pushDividendPayment(uint256 _dividendIndex, uint256 _start, uint256 _iterations) public withPerm(DISTRIBUTE) validDividendIndex(_dividendIndex) {
        Dividend storage dividend = dividends[_dividendIndex];
        uint256 numberInvestors = ISecurityToken(securityToken).getInvestorsLength();
        for (uint256 i = _start; i < Math.min256(numberInvestors, _start.add(_iterations)); i++) {
            address payee = ISecurityToken(securityToken).investors(i);
            if (!dividend.claimed[payee]) {
                _payDividend(payee, dividend, _dividendIndex);
            }
        }
    }

    /**
     * @notice Investors can pull their own dividends
     * @param _dividendIndex Dividend to pull
     */
    function pullDividendPayment(uint256 _dividendIndex) public validDividendIndex(_dividendIndex)
    {
        Dividend storage dividend = dividends[_dividendIndex];
        require(!dividend.claimed[msg.sender], "Dividend already reclaimed");
        _payDividend(msg.sender, dividend, _dividendIndex);
    }

    /**
     * @notice Internal function for paying dividends
     * @param _payee address of investor
     * @param _dividend storage with previously issued dividends
     * @param _dividendIndex Dividend to pay
     */
    function _payDividend(address _payee, Dividend storage _dividend, uint256 _dividendIndex) internal {
        uint256 claim = calculateDividend(_dividendIndex, _payee);
        _dividend.claimed[_payee] = true;
        _dividend.claimedAmount = claim.add(_dividend.claimedAmount);
        if (claim > 0) {
            require(ERC20(_dividend.token).transfer(_payee, claim), "Unable to transfer tokens");
            emit ERC20DividendClaimed(_payee, _dividendIndex, _dividend.token, claim);
        }
    }

    /**
     * @notice Issuer can reclaim remaining unclaimed dividend amounts, for expired dividends
     * @param _dividendIndex Dividend to reclaim
     */
    function reclaimDividend(uint256 _dividendIndex) public onlyOwner {
        require(_dividendIndex < dividends.length, "Incorrect dividend index");
        require(now >= dividends[_dividendIndex].expiry, "Dividend expiry is in the future");
        require(!dividends[_dividendIndex].reclaimed, "Dividend already claimed");
        dividends[_dividendIndex].reclaimed = true;
        Dividend storage dividend = dividends[_dividendIndex];
        uint256 remainingAmount = dividend.amount.sub(dividend.claimedAmount);
        require(ERC20(dividend.token).transfer(msg.sender, remainingAmount), "Unable to transfer tokens");
        emit ERC20DividendReclaimed(msg.sender, _dividendIndex, dividend.token, remainingAmount);
    }

    /**
     * @notice Calculate amount of dividends claimable
     * @param _dividendIndex Dividend to calculate
     * @param _payee Affected investor address
     * @return unit256
     */
    function calculateDividend(uint256 _dividendIndex, address _payee) public view returns(uint256) {
        Dividend storage dividend = dividends[_dividendIndex];
        if (dividend.claimed[_payee]) {
            return 0;
        }
        uint256 balance = ISecurityToken(securityToken).balanceOfAt(_payee, dividends[_dividendIndex].checkpointId);
        return balance.mul(dividends[_dividendIndex].amount).div(dividends[_dividendIndex].totalSupply);
    }

    /**
     * @notice Get the index according to the checkpoint id
     * @param _checkpointId Checkpoint id to query
     * @return uint256
     */
    function getDividendIndex(uint256 _checkpointId) public view returns(uint256[]) {
        uint256 counter = 0;
        for(uint256 i = 0; i < dividends.length; i++) {
            if (dividends[i].checkpointId == _checkpointId) {
                counter++;
            }
        }

       uint256[] memory index = new uint256[](counter);
       counter = 0;
       for(uint256 j = 0; j < dividends.length; j++) {
           if (dividends[j].checkpointId == _checkpointId) {
               index[counter] = j;
               counter++;
           }
       }
       return index;
    }

    /**
     * @notice Return the permissions flag that are associated with STO
     * @return bytes32 array
     */
    function getPermissions() public view returns(bytes32[]) {
        bytes32[] memory allPermissions = new bytes32[](1);
        allPermissions[0] = DISTRIBUTE;
        return allPermissions;
    }

}

/**
 * @title Factory for deploying ERC20DividendCheckpoint module
 */
contract ERC20DividendCheckpointFactory is IModuleFactory {

    /**
     * @notice Constructor
     * @param _polyAddress Address of the polytoken
     * @param _setupCost Setup cost of the module
     * @param _usageCost Usage cost of the module
     * @param _subscriptionCost Subscription cost of the module
     */
    constructor (address _polyAddress, uint256 _setupCost, uint256 _usageCost, uint256 _subscriptionCost) public
    IModuleFactory(_polyAddress, _setupCost, _usageCost, _subscriptionCost)
    {

    }

    /**
     * @notice used to launch the Module with the help of factory
     * @return address Contract address of the Module
     */
    function deploy(bytes /* _data */) external returns(address) {
        if (setupCost > 0)
            require(polyToken.transferFrom(msg.sender, owner, setupCost), "Failed transferFrom because of sufficent Allowance is not provided");
        return address(new ERC20DividendCheckpoint(msg.sender, address(polyToken)));
    }

    /**
     * @notice Type of the Module factory
     */
    function getType() public view returns(uint8) {
        return 4;
    }

    /**
     * @notice Get the name of the Module
     */
    function getName() public view returns(bytes32) {
        return "ERC20DividendCheckpoint";
    }

    /**
     * @notice Get the description of the Module
     */
    function getDescription() public view returns(string) {
        return "Create ERC20 dividends for token holders at a specific checkpoint";
    }

    /**
     * @notice Get the title of the Module
     */
    function getTitle() public  view returns(string) {
        return "ERC20 Dividend Checkpoint";
    }

    /**
     * @notice Get the Instructions that helped to used the module
     */
    function getInstructions() public view returns(string) {
        return "Create a ERC20 dividend which will be paid out to token holders proportional to their balances at the point the dividend is created";
    }

    /**
     * @notice Get the tags related to the module factory
     */
    function getTags() public view returns(bytes32[]) {
        bytes32[] memory availableTags = new bytes32[](3);
        availableTags[0] = "ERC20";
        availableTags[1] = "Dividend";
        availableTags[2] = "Checkpoint";
        return availableTags;
    }
}