pragma solidity ^0.4.17;

/**
 * Allows one to send EIP-20 tokens to multiple addresses cheaply.
 * Copyright © 2017 by ABDK Consulting https://abdk.consulting/
 * Author: Mikhail Vladimirov <mikhail.vladimirov[at]gmail.com>
 */
contract BatchTokenSender {
    /**
     * If you like this contract, you may send some ether to this address and
     * it will be used to develop more useful contracts available to everyone.
     */
    address public donationAddress;

    /**
     * Create new Batch Token Sender with given donation address.
     *
     * @param _donationAddress donation address
     */
    function BatchTokenSender (address _donationAddress) public {
        donationAddress = _donationAddress;
    }

    /**
     * Encode transfer amount and recepient address as a single uin256 value.
     *
     * @param _lotsNumber transfer amount as number of lots
     * @param _to transfer recipient address
     * @return encoded transfer
     */
    function encodeTransfer (uint96 _lotsNumber, address _to)
    public pure returns (uint256 _encodedTransfer) {
        return (_lotsNumber << 160) | uint160 (_to);
    }

    /**
     * Perform multiple token transfers from message sender's address.
     *
     * @param _token EIP-20 token smart contract that manages tokens to be sent
     * @param _lotSize number of tokens in lot
     * @param _transfers an array or encoded transfers to perform
     */
    function batchSend (
        Token _token, uint160 _lotSize, uint256 [] _transfers) public {
        uint256 count = _transfers.length;
        for (uint256 i = 0; i < count; i++) {
            uint256 transfer = _transfers [i];
            uint256 value = (transfer >> 160) * _lotSize;
            address to = address (
                transfer & 0x00FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF);
            if (!_token.transferFrom (msg.sender, to, value)) revert ();
        }
    }
}

/**
 * EIP-20 standard token interface, as defined
 * <a href="https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md">here</a>.
 */
contract Token {
    /**
     * Get total number of tokens in circulation.
     *
     * @return total number of tokens in circulation
     */
    function totalSupply ()
    public constant returns (uint256 supply);

    /**
     * Get number of tokens currently belonging to given owner.
     *
     * @param _owner address to get number of tokens currently belonging to the
     *        owner of
     * @return number of tokens currently belonging to the owner of given
     *         address
     */
    function balanceOf (address _owner)
    public constant returns (uint256 balance);

    /**
     * Transfer given number of tokens from message sender to given recipient.
     *
     * @param _to address to transfer tokens to the owner of
     * @param _value number of tokens to transfer to the owner of given address
     * @return true if tokens were transferred successfully, false otherwise
     */
    function transfer (address _to, uint256 _value)
    public returns (bool success);

    /**
     * Transfer given number of tokens from given owner to given recipient.
     *
     * @param _from address to transfer tokens from the owner of
     * @param _to address to transfer tokens to the owner of
     * @param _value number of tokens to transfer from given owner to given
     *        recipient
     * @return true if tokens were transferred successfully, false otherwise
     */
    function transferFrom (address _from, address _to, uint256 _value)
    public returns (bool success);

    /**
     * Allow given spender to transfer given number of tokens from message
     * sender.
     *
     * @param _spender address to allow the owner of to transfer tokens from
     *        message sender
     * @param _value number of tokens to allow to transfer
     * @return true if token transfer was successfully approved, false otherwise
     */
    function approve (address _spender, uint256 _value)
    public returns (bool success);

    /**
     * Tell how many tokens given spender is currently allowed to transfer from
     * given owner.
     *
     * @param _owner address to get number of tokens allowed to be transferred
     *        from the owner of
     * @param _spender address to get number of tokens allowed to be transferred
     *        by the owner of
     * @return number of tokens given spender is currently allowed to transfer
     *         from given owner
     */
    function allowance (address _owner, address _spender)
    public constant returns (uint256 remaining);

    /**
     * Logged when tokens were transferred from one owner to another.
     *
     * @param _from address of the owner, tokens were transferred from
     * @param _to address of the owner, tokens were transferred to
     * @param _value number of tokens transferred
     */
    event Transfer (address indexed _from, address indexed _to, uint256 _value);

    /**
     * Logged when owner approved his tokens to be transferred by some spender.
     * @param _owner owner who approved his tokens to be transferred
     * @param _spender spender who were allowed to transfer the tokens belonging
     *        to the owner
     * @param _value number of tokens belonging to the owner, approved to be
     *        transferred by the spender
     */
    event Approval (
        address indexed _owner, address indexed _spender, uint256 _value);
}

pragma solidity 0.5.1;


contract Ownable {
    address public owner;
    address public pendingOwner;

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

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

    /**
     * @dev Modifier throws if called by any account other than the pendingOwner.
     */
    modifier onlyPendingOwner() {
        require(msg.sender == pendingOwner);
        _;
    }

    constructor() public {
        owner = msg.sender;
    }

    /**
     * @dev Allows the current owner to set the pendingOwner address.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) onlyOwner public {
        pendingOwner = newOwner;
    }

    /**
     * @dev Allows the pendingOwner address to finalize the transfer.
     */
    function claimOwnership() onlyPendingOwner public {
        emit OwnershipTransferred(owner, pendingOwner);
        owner = pendingOwner;
        pendingOwner = address(0);
    }
}


contract Manageable is Ownable {
    mapping(address => bool) public listOfManagers;

    modifier onlyManager() {
        require(listOfManagers[msg.sender], "");
        _;
    }

    function addManager(address _manager) public onlyOwner returns (bool success) {
        if (!listOfManagers[_manager]) {
            require(_manager != address(0), "");
            listOfManagers[_manager] = true;
            success = true;
        }
    }

    function removeManager(address _manager) public onlyOwner returns (bool success) {
        if (listOfManagers[_manager]) {
            listOfManagers[_manager] = false;
            success = true;
        }
    }

    function getInfo(address _manager) public view returns (bool) {
        return listOfManagers[_manager];
    }
}

/**
 * @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);
}


contract LuckyBucks is IERC20, Manageable {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowed;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor() public {
        _name = "Lucky Bucks";
        _symbol = "LBT";
        _decimals = 18;
        _totalSupply = 1000000000 * (uint(10) ** _decimals);

        _balances[0x3C5459BCDE2D5c1eDc4Cc6C6547d6cb360Ce5aE9] = _totalSupply;
        emit Transfer(address(0), 0x3C5459BCDE2D5c1eDc4Cc6C6547d6cb360Ce5aE9, _totalSupply);
    }

    /**
     * @return the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @return the symbol of the token.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @return the number of decimals of the token.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }

    /**
    * @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 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.
     * Note that while this function emits an Approval event, this is not required as per the specification,
     * and other compliant implementations may not emit the event.
     * @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) {
        _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
        _transfer(from, to, value);
        emit Approval(from, msg.sender, _allowed[from][msg.sender]);
        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 LuckyBucks.sol
     * Emits an Approval event.
     * @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 LuckyBucks.sol
     * Emits an Approval event.
     * @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 Function to mint tokens
     * @param to The address that will receive the minted tokens.
     * @param value The amount of tokens to mint.
     * @return A boolean that indicates if the operation was successful.
     */
    function mint(address to, uint256 value) public onlyManager returns (bool) {
        _mint(to, value);
        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(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 value The amount that will be created.
     */
    function _mint(address account, uint256 value) internal {
        require(account != address(0));

        _totalSupply = _totalSupply.add(value);
        _balances[account] = _balances[account].add(value);
        emit Transfer(address(0), account, value);
    }

    /**
     * @dev Reclaim all ERC20Basic compatible tokens
     * @param _token ERC20B The address of the token contract
     */
    function reclaimToken(IERC20 _token) external onlyOwner {
        uint256 balance = _token.balanceOf(address(this));
        _token.transfer(owner, balance);
    }
}


/**
 * @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;
    }
}