pragma solidity ^0.4.24;

/**
 * @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) {
        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 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 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 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 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 Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract BurnableToken is BasicToken {

    event Burn(address indexed burner, uint256 value);

    /**
     * @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);
    }

    function _burn(address _who, uint256 _value) internal {
        require(_value <= balances[_who]);
        // no need to require value <= totalSupply, since that would imply the
        // sender's balance is greater than the totalSupply, which *should* be an assertion failure

        balances[_who] = balances[_who].sub(_value);
        totalSupply_ = totalSupply_.sub(_value);
        emit Burn(_who, _value);
        emit Transfer(_who, address(0), _value);
    }

}

/**
 * @title Standard Burnable Token
 * @dev Adds burnFrom method to ERC20 implementations
 */
contract StandardBurnableToken is BurnableToken, StandardToken {

    /**
     * @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 {
        require(_value <= allowed[_from][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[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        _burn(_from, _value);
    }
}

/**
 * @title ERC827 interface, an extension of ERC20 token standard
 *
 * @dev Interface of a ERC827 token, following the ERC20 standard with extra
 * @dev methods to transfer value and data and execute calls in transfers and
 * @dev approvals.
 */
contract ERC827 is ERC20 {
    function approveAndCall(
        address _spender,
        uint256 _value,
        bytes _data
    )
    public
    payable
    returns (bool);

    function transferAndCall(
        address _to,
        uint256 _value,
        bytes _data
    )
    public
    payable
    returns (bool);

    function transferFromAndCall(
        address _from,
        address _to,
        uint256 _value,
        bytes _data
    )
    public
    payable
    returns (bool);
}

/**
 * @title ERC827, an extension of ERC20 token standard
 *
 * @dev Implementation the ERC827, following the ERC20 standard with extra
 * @dev methods to transfer value and data and execute calls in transfers and
 * @dev approvals.
 *
 * @dev Uses OpenZeppelin StandardToken.
 */
contract ERC827Token is ERC827, StandardToken {

    /**
     * @dev Addition to ERC20 token methods. It allows to
     * @dev approve the transfer of value and execute a call with the sent data.
     *
     * @dev Beware that changing an allowance with this method brings the risk that
     * @dev someone may use both the old and the new allowance by unfortunate
     * @dev transaction ordering. One possible solution to mitigate this race condition
     * @dev is to first reduce the spender's allowance to 0 and set the desired value
     * @dev afterwards:
     * @dev 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 approveAndCall(
        address _spender,
        uint256 _value,
        bytes _data
    )
    public
    payable
    returns (bool)
    {
        require(_spender != address(this));

        super.approve(_spender, _value);

        // solium-disable-next-line security/no-call-value
        require(_spender.call.value(msg.value)(_data));

        return true;
    }

    /**
     * @dev Addition to ERC20 token methods. Transfer tokens to a specified
     * @dev 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 transferAndCall(
        address _to,
        uint256 _value,
        bytes _data
    )
    public
    payable
    returns (bool)
    {
        require(_to != address(this));

        super.transfer(_to, _value);

        // solium-disable-next-line security/no-call-value
        require(_to.call.value(msg.value)(_data));
        return true;
    }

    /**
     * @dev Addition to ERC20 token methods. Transfer tokens from one address to
     * @dev 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 transferFromAndCall(
        address _from,
        address _to,
        uint256 _value,
        bytes _data
    )
    public payable returns (bool)
    {
        require(_to != address(this));

        super.transferFrom(_from, _to, _value);

        // solium-disable-next-line security/no-call-value
        require(_to.call.value(msg.value)(_data));
        return true;
    }

    /**
     * @dev Addition to StandardToken methods. Increase the amount of tokens that
     * @dev an owner allowed to a spender and execute a call with the sent data.
     *
     * @dev approve should be called when allowed[_spender] == 0. To increment
     * @dev allowed value is better to use this function to avoid 2 calls (and wait until
     * @dev the first transaction is mined)
     * @dev 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 increaseApprovalAndCall(
        address _spender,
        uint _addedValue,
        bytes _data
    )
    public
    payable
    returns (bool)
    {
        require(_spender != address(this));

        super.increaseApproval(_spender, _addedValue);

        // solium-disable-next-line security/no-call-value
        require(_spender.call.value(msg.value)(_data));

        return true;
    }

    /**
     * @dev Addition to StandardToken methods. Decrease the amount of tokens that
     * @dev an owner allowed to a spender and execute a call with the sent data.
     *
     * @dev approve should be called when allowed[_spender] == 0. To decrement
     * @dev allowed value is better to use this function to avoid 2 calls (and wait until
     * @dev the first transaction is mined)
     * @dev 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 decreaseApprovalAndCall(
        address _spender,
        uint _subtractedValue,
        bytes _data
    )
    public
    payable
    returns (bool)
    {
        require(_spender != address(this));

        super.decreaseApproval(_spender, _subtractedValue);

        // solium-disable-next-line security/no-call-value
        require(_spender.call.value(msg.value)(_data));

        return true;
    }

}

/**
 * @title Freezable Token
 * @dev Token that can be Frozen.
 */
contract FreezableToken is BasicToken {

    mapping (address => uint256) freezes;
    event Freeze(address indexed from, uint256 value);
    event Unfreeze(address indexed from, uint256 value);

    function freeze(uint256 _value) public returns (bool success) {
        require(_value <= balances[msg.sender]);
        balances[msg.sender] = balances[msg.sender].sub(_value);
        freezes[msg.sender] = freezes[msg.sender].add(_value);
        emit Freeze(msg.sender, _value);
        return true;
    }

    function unfreeze(uint256 _value) public returns (bool success) {
        require(_value <= freezes[msg.sender]);
        freezes[msg.sender] = freezes[msg.sender].sub(_value);
        balances[msg.sender] = balances[msg.sender].add(_value);
        emit Unfreeze(msg.sender, _value);
        return true;
    }
    function freezeOf(address _owner) public view returns (uint256) {
        return freezes[_owner];
    }
}

contract ChainBowToken is StandardBurnableToken, FreezableToken, ERC827Token {

    string public name;
    string public symbol;
    uint8 public decimals;
    address public admin;

    constructor(address _teamWallet, uint256 _initialSupply, string _tokenName, string _tokenSymbol, uint8 _decimals) public {
        totalSupply_ = _initialSupply;
        balances[_teamWallet] = _initialSupply;
        name = _tokenName;
        symbol = _tokenSymbol;
        decimals = _decimals;
        admin = msg.sender;
    }

    /**
     * withdraw foreign tokens
     */
    function withdrawForeignTokens(address _tokenContract) public returns (bool) {
        require(msg.sender == admin);
        ERC20Basic token = ERC20Basic(_tokenContract);
        uint256 amount = token.balanceOf(address(this));
        return token.transfer(admin, amount);
    }

}