// File: zos-lib/contracts/Initializable.sol

pragma solidity >=0.4.24 <0.6.0;


/**
 * @title Initializable
 *
 * @dev Helper contract to support initializer functions. To use it, replace
 * the constructor with a function that has the `initializer` modifier.
 * WARNING: Unlike constructors, initializer functions must be manually
 * invoked. This applies both to deploying an Initializable contract, as well
 * as extending an Initializable contract via inheritance.
 * WARNING: When used with inheritance, manual care must be taken to not invoke
 * a parent initializer twice, or ensure that all initializers are idempotent,
 * because this is not dealt with automatically as with constructors.
 */
contract Initializable {

  /**
   * @dev Indicates that the contract has been initialized.
   */
  bool private initialized;

  /**
   * @dev Indicates that the contract is in the process of being initialized.
   */
  bool private initializing;

  /**
   * @dev Modifier to use in the initializer function of a contract.
   */
  modifier initializer() {
    require(initializing || isConstructor() || !initialized, "Contract instance has already been initialized");

    bool wasInitializing = initializing;
    initializing = true;
    initialized = true;

    _;

    initializing = wasInitializing;
  }

  /// @dev Returns true if and only if the function is running in the constructor
  function isConstructor() private view returns (bool) {
    // extcodesize checks the size of the code stored in an address, and
    // address returns the current address. Since the code is still not
    // deployed when running a constructor, any checks on its code size will
    // yield zero, making it an effective way to detect if a contract is
    // under construction or not.
    uint256 cs;
    assembly { cs := extcodesize(address) }
    return cs == 0;
  }

  // Reserved storage space to allow for layout changes in the future.
  uint256[50] private ______gap;
}

// File: openzeppelin-eth/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.4.24;


/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
interface IERC20 {
  function totalSupply() external view returns (uint256);

  function balanceOf(address who) external view returns (uint256);

  function allowance(address owner, address spender)
    external view returns (uint256);

  function transfer(address to, uint256 value) external returns (bool);

  function approve(address spender, uint256 value)
    external returns (bool);

  function transferFrom(address from, address to, uint256 value)
    external returns (bool);

  event Transfer(
    address indexed from,
    address indexed to,
    uint256 value
  );

  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

// File: openzeppelin-eth/contracts/math/SafeMath.sol

pragma solidity ^0.4.24;


/**
 * @title SafeMath
 * @dev Math operations with safety checks that revert on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, reverts on overflow.
  */
  function mul(uint256 a, uint256 b) internal pure returns (uint256) {
    // Gas optimization: this is cheaper than requiring '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;
    }

    uint256 c = a * b;
    require(c / a == b);

    return c;
  }

  /**
  * @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
  */
  function div(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b > 0); // Solidity only automatically asserts 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, reverts on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b <= a);
    uint256 c = a - b;

    return c;
  }

  /**
  * @dev Adds two numbers, reverts on overflow.
  */
  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    require(c >= a);

    return c;
  }

  /**
  * @dev Divides two numbers and returns the remainder (unsigned integer modulo),
  * reverts when dividing by zero.
  */
  function mod(uint256 a, uint256 b) internal pure returns (uint256) {
    require(b != 0);
    return a % b;
  }
}

// File: openzeppelin-eth/contracts/token/ERC20/ERC20.sol

pragma solidity ^0.4.24;





/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
 * Originally based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract ERC20 is Initializable, IERC20 {
  using SafeMath for uint256;

  mapping (address => uint256) private _balances;

  mapping (address => mapping (address => uint256)) private _allowed;

  uint256 private _totalSupply;

  /**
  * @dev Total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return _totalSupply;
  }

  /**
  * @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];
  }

  /**
   * @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 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) {
    _transfer(msg.sender, 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) {
    require(spender != address(0));

    _allowed[msg.sender][spender] = value;
    emit Approval(msg.sender, spender, value);
    return true;
  }

  /**
   * @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(value <= _allowed[from][msg.sender]);

    _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
    _transfer(from, to, value);
    return true;
  }

  /**
   * @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 increaseAllowance(
    address spender,
    uint256 addedValue
  )
    public
    returns (bool)
  {
    require(spender != address(0));

    _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 decreaseAllowance(
    address spender,
    uint256 subtractedValue
  )
    public
    returns (bool)
  {
    require(spender != address(0));

    _allowed[msg.sender][spender] = (
      _allowed[msg.sender][spender].sub(subtractedValue));
    emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
    return true;
  }

  /**
  * @dev Transfer token for a specified addresses
  * @param from The address to transfer from.
  * @param to The address to transfer to.
  * @param value The amount to be transferred.
  */
  function _transfer(address from, address to, uint256 value) internal {
    require(value <= _balances[from]);
    require(to != address(0));

    _balances[from] = _balances[from].sub(value);
    _balances[to] = _balances[to].add(value);
    emit Transfer(from, to, value);
  }

  /**
   * @dev Internal function that mints an amount of the token and assigns it to
   * an account. This encapsulates the modification of balances such that the
   * proper events are emitted.
   * @param account The account that will receive the created tokens.
   * @param amount The amount that will be created.
   */
  function _mint(address account, uint256 amount) internal {
    require(account != 0);
    _totalSupply = _totalSupply.add(amount);
    _balances[account] = _balances[account].add(amount);
    emit Transfer(address(0), account, amount);
  }

  /**
   * @dev Internal function that burns an amount of the token of a given
   * account.
   * @param account The account whose tokens will be burnt.
   * @param amount The amount that will be burnt.
   */
  function _burn(address account, uint256 amount) internal {
    require(account != 0);
    require(amount <= _balances[account]);

    _totalSupply = _totalSupply.sub(amount);
    _balances[account] = _balances[account].sub(amount);
    emit Transfer(account, address(0), amount);
  }

  /**
   * @dev Internal function that burns an amount of the token of a given
   * account, deducting from the sender's allowance for said account. Uses the
   * internal burn function.
   * @param account The account whose tokens will be burnt.
   * @param amount The amount that will be burnt.
   */
  function _burnFrom(address account, uint256 amount) internal {
    require(amount <= _allowed[account][msg.sender]);

    // Should https://github.com/OpenZeppelin/zeppelin-solidity/issues/707 be accepted,
    // this function needs to emit an event with the updated approval.
    _allowed[account][msg.sender] = _allowed[account][msg.sender].sub(
      amount);
    _burn(account, amount);
  }

  uint256[50] private ______gap;
}

// File: openzeppelin-eth/contracts/token/ERC20/ERC20Burnable.sol

pragma solidity ^0.4.24;




/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract ERC20Burnable is Initializable, ERC20 {

  /**
   * @dev Burns a specific amount of tokens.
   * @param value The amount of token to be burned.
   */
  function burn(uint256 value) public {
    _burn(msg.sender, value);
  }

  /**
   * @dev Burns a specific amount of tokens from the target address and decrements allowance
   * @param from address The address which you want to send tokens from
   * @param value uint256 The amount of token to be burned
   */
  function burnFrom(address from, uint256 value) public {
    _burnFrom(from, value);
  }

  uint256[50] private ______gap;
}

// File: openzeppelin-eth/contracts/ownership/Ownable.sol

pragma solidity ^0.4.24;


/**
 * @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 is Initializable {
  address private _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.
   */
  function initialize(address sender) public initializer {
    _owner = sender;
  }

  /**
   * @return the address of the owner.
   */
  function owner() public view returns(address) {
    return _owner;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(isOwner());
    _;
  }

  /**
   * @return true if `msg.sender` is the owner of the contract.
   */
  function isOwner() public view returns(bool) {
    return msg.sender == _owner;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  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;
  }

  uint256[50] private ______gap;
}

// File: contracts/ERC20Mintable.sol

pragma solidity ^0.4.24;





/**
 * @title ERC20Mintable
 * @dev ERC20 minting logic
 */
contract ERC20Mintable is Initializable, ERC20, Ownable {
  function initialize(address sender) public initializer {
    Ownable.initialize(sender);
  }

  /**
   * @dev Function to mint tokens
   * @param to The address that will receive the minted tokens.
   * @param amount The amount of tokens to mint.
   * @return A boolean that indicates if the operation was successful.
   */
  function mint(
    address to,
    uint256 amount
  )
    public
    onlyOwner
    returns (bool)
  {
    _mint(to, amount);
    return true;
  }


  modifier hasMintPermission() {
    require(msg.sender == owner());
    _;
  }

  uint256[50] private ______gap;
}

// File: openzeppelin-eth/contracts/token/ERC20/ERC20Detailed.sol

pragma solidity ^0.4.24;




/**
 * @title ERC20Detailed 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 ERC20Detailed is Initializable, IERC20 {
  string private _name;
  string private _symbol;
  uint8 private _decimals;

  function initialize(string name, string symbol, uint8 decimals) public initializer {
    _name = name;
    _symbol = symbol;
    _decimals = decimals;
  }

  /**
   * @return the name of the token.
   */
  function name() public view returns(string) {
    return _name;
  }

  /**
   * @return the symbol of the token.
   */
  function symbol() public view returns(string) {
    return _symbol;
  }

  /**
   * @return the number of decimals of the token.
   */
  function decimals() public view returns(uint8) {
    return _decimals;
  }

  uint256[50] private ______gap;
}

// File: contracts/ERC677Receiver.sol

pragma solidity 0.4.24;


contract ERC677Receiver {
  function onTokenTransfer(address _from, uint _value, bytes _data) external returns(bool);
}

// File: contracts/ERC677InitializableToken.sol

pragma solidity 0.4.24;

//import "openzeppelin-eth/contracts/token/ERC20/ERC20Mintable.sol";


//import "openzeppelin-eth/contracts/ownership/Ownerable.sol";




contract ERC677 is ERC20 {
    event Transfer(address indexed from, address indexed to, uint value, bytes data);

    function transferAndCall(address, uint, bytes) external returns (bool);


}


contract ERC677InitializableToken is
    ERC677,
    ERC20Detailed,
    ERC20Burnable,
    ERC20Mintable {

    event ContractFallbackCallFailed(address from, address to, uint value);

    address public bridgeContract;

    uint256 lastFundingPeriod = 0;
    uint256 totalPeriodFundedAmount = 0;

    FundingRules fundingRules;

    struct FundingRules {
        uint256 periodLength; // refresh period for next funding round in blocks
        uint256 maxPeriodFunds; // max amount to fund in a period
        uint256 threshold; // amount below which a funding event happens
        uint256 amount; // amount to fund
    }

    function initialize(string _name, string _symbol, uint8 _decimals, address _owner) external initializer {
        ERC20Mintable.initialize(_owner);
        ERC20Detailed.initialize(_name, _symbol, _decimals);
    }


    function () payable {}

    function setFundingRules(uint256 _periodLength, uint256 _maxPeriodFunds, uint256 _threshold, uint256 _amount) onlyOwner public {
        fundingRules.periodLength = _periodLength;
        fundingRules.maxPeriodFunds = _maxPeriodFunds;
        fundingRules.threshold = _threshold;
        fundingRules.amount = _amount;
    }

    function getFundingRules() public view returns(uint256, uint256, uint256, uint256){
        return (fundingRules.periodLength,
        fundingRules.maxPeriodFunds,
        fundingRules.threshold,
        fundingRules.amount);
    }

    function fundReceiver(address _to) internal {
        // reset funding period
        if(block.number > fundingRules.periodLength + lastFundingPeriod) {
            lastFundingPeriod = block.number;
            totalPeriodFundedAmount = 0;
        }
        // transfer receiver money only if limits are not met and they are below the threshold
        if(address(_to).balance < fundingRules.threshold && fundingRules.amount + totalPeriodFundedAmount <= fundingRules.maxPeriodFunds) {
            if(address(_to).send(fundingRules.amount)){
                totalPeriodFundedAmount += fundingRules.amount;
            }
        }
    }

    function setBridgeContract(address _bridgeContract) onlyOwner public {
        require(_bridgeContract != address(0) && isContract(_bridgeContract));
        bridgeContract = _bridgeContract;
    }

    modifier validRecipient(address _recipient) {
        require(_recipient != address(0) && _recipient != address(this));
        _;
    }

    function transferAndCall(address _to, uint _value, bytes _data)
        external validRecipient(_to) returns (bool)
    {
        require(superTransfer(_to, _value));
        fundReceiver(_to);
        emit Transfer(msg.sender, _to, _value, _data);

        if (isContract(_to)) {
            require(contractFallback(_to, _value, _data));
        }
        return true;
    }

    function getTokenInterfacesVersion() public pure returns(uint64 major, uint64 minor, uint64 patch) {
        return (2, 0, 0);
    }

    function superTransfer(address _to, uint256 _value) internal returns(bool)
    {
        return super.transfer(_to, _value);
    }

    function transfer(address _to, uint256 _value) public returns (bool)
    {
        require(superTransfer(_to, _value), "failed superTransfer");
        fundReceiver(_to);
        if (isContract(_to) && !contractFallback(_to, _value, new bytes(0))) {
            if (_to == bridgeContract) {
                revert("reverted here");
            } else {
                emit ContractFallbackCallFailed(msg.sender, _to, _value);
            }
        }
        return true;
    }

    function contractFallback(address _to, uint _value, bytes _data)
        private
        returns(bool)
    {
        return _to.call(abi.encodeWithSignature("onTokenTransfer(address,uint256,bytes)",  msg.sender, _value, _data));
    }

    function isContract(address _addr)
        private
        view
        returns (bool)
    {
        uint length;
        assembly { length := extcodesize(_addr) }
        return length > 0;
    }

    function mint(
        address _to,
        uint256 _amount
    )
    public
    hasMintPermission
    returns (bool)
    {
        fundReceiver(_to);
        return super.mint(_to, _amount);
    }

    function finishMinting() public returns (bool) {
        revert();
    }

    function renounceOwnership() public onlyOwner {
        revert();
    }

    function claimTokens(address _token, address _to) public onlyOwner {
        require(_to != address(0));
        if (_token == address(0)) {
            _to.transfer(address(this).balance);
            return;
        }

        ERC20Detailed token = ERC20Detailed(_token);
        uint256 balance = token.balanceOf(address(this));
        require(token.transfer(_to, balance));
    }

}

// File: contracts/ERC677InitializableBridgeToken.sol

pragma solidity 0.4.24;


contract ERC677InitializableBridgeToken is ERC677InitializableToken {
    mapping(address => bool) internal validBridgeContract;

    function addBridgeContract(address _contract) onlyOwner public {
        require(_contract != address(0) && isContract(_contract));
        validBridgeContract[_contract] = true;
    }

    function removeBridgeContract(address _contract) onlyOwner public {
        require(_contract != address(0) && isContract(_contract));
        delete validBridgeContract[_contract];
    }

    function isBridgeContract(address _contract) public view returns (bool) {
        return validBridgeContract[_contract];
    }

    function transferAndCall(address _to, uint _value, bytes _data)
        external validRecipient(_to) returns (bool)
    {
        require(superTransfer(_to, _value));
        fundReceiver(_to);
        emit Transfer(msg.sender, _to, _value, _data);

        if (isBridgeContract(_to) && !contractFallback(_to, _value, _data)) {
            revert("reverted here");
        }

        return true;
    }

    function transfer(address _to, uint256 _value) public returns (bool)
    {
        require(superTransfer(_to, _value), "failed superTransfer");
        fundReceiver(_to);
        if (isBridgeContract(_to) && !contractFallback(_to, _value, new bytes(0))) {
            revert("reverted here");
        }

        return true;
    }

    function contractFallback(address _to, uint _value, bytes _data)
        private
        returns(bool)
    {
        return _to.call(abi.encodeWithSignature("onTokenTransfer(address,uint256,bytes)",  msg.sender, _value, _data));
    }

    function isContract(address _addr)
        private
        view
        returns (bool)
    {
        uint length;
        assembly { length := extcodesize(_addr) }
        return length > 0;
    }
}