contract ESportsConstants {
    uint constant TOKEN_DECIMALS = 18;
    uint8 constant TOKEN_DECIMALS_UINT8 = uint8(TOKEN_DECIMALS);
    uint constant TOKEN_DECIMAL_MULTIPLIER = 10 ** TOKEN_DECIMALS;

    uint constant RATE = 240; // = 1 ETH
}

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
    function mul(uint256 a, uint256 b) internal constant returns (uint256) {
        uint256 c = a * b;
        assert(a == 0 || c / a == b);
        return c;
    }

    function div(uint256 a, uint256 b) internal constant 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;
    }

    function sub(uint256 a, uint256 b) internal constant returns (uint256) {
        assert(b <= a);
        return a - b;
    }

    function add(uint256 a, uint256 b) internal constant returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}

/**
 * @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() {
        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) onlyOwner {
        require(newOwner != address(0));
        OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }
}

contract ESportsFreezingStorage is Ownable {
    // Timestamp when token release is enabled
    uint64 public releaseTime;

    // ERC20 basic token contract being held
    // ERC20Basic token;
    ESportsToken token;
    
    function ESportsFreezingStorage(ESportsToken _token, uint64 _releaseTime) { //ERC20Basic
        require(_releaseTime > now);
        
        releaseTime = _releaseTime;
        token = _token;
    }

    function release(address _beneficiary) onlyOwner returns(uint) {
        //require(now >= releaseTime);
        if (now < releaseTime) return 0;

        uint amount = token.balanceOf(this);
        //require(amount > 0);
        if (amount == 0)  return 0;

        // token.safeTransfer(beneficiary, amount);
        //require(token.transfer(_beneficiary, amount));
        bool result = token.transfer(_beneficiary, amount);
        if (!result) return 0;
        
        return amount;
    }
}

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
    uint256 public totalSupply;
    function balanceOf(address who) constant returns (uint256);
    function transfer(address to, uint256 value) 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) constant returns (uint256);
  	function transferFrom(address from, address to, uint256 value) returns (bool);
  	function approve(address spender, uint256 value) 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;

    /**
    * @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) returns (bool) {
        require(_to != address(0));

        // 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) constant returns (uint256 balance) {
        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)) 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) returns (bool) {
        require(_to != address(0));

        var _allowance = allowed[_from][msg.sender];

        // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
        // require (_value <= _allowance);

        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][msg.sender] = _allowance.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.
     * @param _spender The address which will spend the funds.
     * @param _value The amount of tokens to be spent.
     */
    function approve(address _spender, uint256 _value) returns (bool) {

        // To change the approve amount you first have to reduce the addresses`
        //  allowance to zero by calling `approve(_spender, 0)` if it is not
        //  already 0 to mitigate the race condition described here:
        //  https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
        require((_value == 0) || (allowed[msg.sender][_spender] == 0));

        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) constant returns (uint256 remaining) {
        return allowed[_owner][_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
     */
    function increaseApproval(address _spender, uint _addedValue) returns (bool success) {
        allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
        Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

    function decreaseApproval(address _spender, uint _subtractedValue) returns (bool success) {
        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 Mintable token
 * @dev Simple ERC20 Token example, with mintable token creation
 * @dev Issue: * https://github.com/OpenZeppelin/zeppelin-solidity/issues/120
 * Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
 */
contract MintableToken is StandardToken, Ownable {
    event Mint(address indexed to, uint256 amount);

    event MintFinished();

    bool public mintingFinished = false;

    modifier canMint() {
        require(!mintingFinished);
        _;
    }

    /**
     * @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) onlyOwner canMint returns (bool) {
        totalSupply = totalSupply.add(_amount);
        balances[_to] = balances[_to].add(_amount);
        Mint(_to, _amount);
        Transfer(0x0, _to, _amount);
        return true;
    }

    /**
     * @dev Function to stop minting new tokens.
     * @return True if the operation was successful.
     */
    function finishMinting() onlyOwner returns (bool) {
        mintingFinished = true;
        MintFinished();
        return true;
    }
}

contract ESportsToken is ESportsConstants, MintableToken {
    using SafeMath for uint;

    event Burn(address indexed burner, uint value);
    event MintTimelocked(address indexed beneficiary, uint amount);

    /**
     * @dev Pause token transfer. After successfully finished crowdsale it becomes false
     */
    bool public paused = true;
    /**
     * @dev Accounts who can transfer token even if paused. Works only during crowdsale
     */
    mapping(address => bool) excluded;

    mapping (address => ESportsFreezingStorage[]) public frozenFunds;

    function name() constant public returns (string _name) {
        return "ESports Token";
    }

    function symbol() constant public returns (string _symbol) {
        return "ERT";
    }

    function decimals() constant public returns (uint8 _decimals) {
        return TOKEN_DECIMALS_UINT8;
    }
    
    function allowMoveTokens() onlyOwner {
        paused = false;
    }

    function addExcluded(address _toExclude) onlyOwner {
        addExcludedInternal(_toExclude);
    }
    
    function addExcludedInternal(address _toExclude) private {
        excluded[_toExclude] = true;
    }

    /**
     * @dev Wrapper of token.transferFrom
     */
    function transferFrom(address _from, address _to, uint _value) returns (bool) {
        require(!paused || excluded[_from]);

        return super.transferFrom(_from, _to, _value);
    }

    /**
     * @dev Wrapper of token.transfer 
     */
    function transfer(address _to, uint _value) returns (bool) {
        require(!paused || excluded[msg.sender]);

        return super.transfer(_to, _value);
    }

    /**
     * @dev Mint timelocked tokens
     */
    function mintTimelocked(address _to, uint _amount, uint32 _releaseTime)
            onlyOwner canMint returns (ESportsFreezingStorage) {
        ESportsFreezingStorage timelock = new ESportsFreezingStorage(this, _releaseTime);
        mint(timelock, _amount);

        frozenFunds[_to].push(timelock);
        addExcludedInternal(timelock);

        MintTimelocked(_to, _amount);

        return timelock;
    }

    /**
     * @dev Release frozen tokens
     * @return Total amount of released tokens
     */
    function returnFrozenFreeFunds() public returns (uint) {
        uint total = 0;
        ESportsFreezingStorage[] storage frozenStorages = frozenFunds[msg.sender];
        // for (uint x = 0; x < frozenStorages.length; x++) {
        //     uint amount = balanceOf(frozenStorages[x]);
        //     if (frozenStorages[x].call(bytes4(sha3("release(address)")), msg.sender))
        //         total = total.add(amount);
        // }
        for (uint x = 0; x < frozenStorages.length; x++) {
            uint amount = frozenStorages[x].release(msg.sender);
            total = total.add(amount);
        }
        
        return total;
    }

    /**
     * @dev Burns a specific amount of tokens.
     * @param _value The amount of token to be burned.
     */
    function burn(uint _value) public {
        require(!paused || excluded[msg.sender]);
        require(_value > 0);

        balances[msg.sender] = balances[msg.sender].sub(_value);
        totalSupply = totalSupply.sub(_value);
        
        Burn(msg.sender, _value);
    }
}