contract RATCToken is StandardToken, SafeMath {
 
    // metadata
    string  public constant name = "RATC";
    string  public constant symbol = "RATC";
    uint256 public constant decimals = 18;
    string  public version = "1.0";
 
    // contracts
    address public ethFundDeposit;          // ETH存放地址
    address public newContractAddr;         // token更新地址
 
    // crowdsale parameters
    bool    public isFunding;                // 状态切换到true
    uint256 public fundingStartBlock;
    uint256 public fundingStopBlock;
 
    uint256 public currentSupply;           // 正在售卖中的tokens数量
    uint256 public tokenRaised = 0;         // 总的售卖数量token
    uint256 public tokenMigrated = 0;     // 总的已经交易的 token
    uint256 public tokenExchangeRate = 1000;             // 1000 RATC 兑换 1 ETH
 
    // events
    event AllocateToken(address indexed _to, uint256 _value);   // 分配的私有交易token;
    event IssueToken(address indexed _to, uint256 _value);      // 公开发行售卖的token;
    event IncreaseSupply(uint256 _value);
    event DecreaseSupply(uint256 _value);
    event Migrate(address indexed _to, uint256 _value);
 
    // 转换
    function formatDecimals(uint256 _value) internal returns (uint256 ) {
        return _value * 10 ** decimals;
    }
 
    // constructor
    function RATCToken(
        address _ethFundDeposit,
        uint256 _currentSupply)
    {
        ethFundDeposit = _ethFundDeposit;
 
        isFunding = false;                           //通过控制预CrowdS ale状态
        fundingStartBlock = 0;
        fundingStopBlock = 0;
 
        currentSupply = formatDecimals(_currentSupply);
        totalSupply = formatDecimals(130000000);
        balances[msg.sender] = totalSupply;
        if(currentSupply > totalSupply) throw;
    }
 
    modifier isOwner()  { require(msg.sender == ethFundDeposit); _; }
 
    ///  设置token汇率
    function setTokenExchangeRate(uint256 _tokenExchangeRate) isOwner external {
        if (_tokenExchangeRate == 0) throw;
        if (_tokenExchangeRate == tokenExchangeRate) throw;
 
        tokenExchangeRate = _tokenExchangeRate;
    }
 
    /// @dev 超发token处理
    function increaseSupply (uint256 _value) isOwner external {
        uint256 value = formatDecimals(_value);
        if (value + currentSupply > totalSupply) throw;
        currentSupply = safeAdd(currentSupply, value);
        IncreaseSupply(value);
    }
 
    /// @dev 被盗token处理
    function decreaseSupply (uint256 _value) isOwner external {
        uint256 value = formatDecimals(_value);
        if (value + tokenRaised > currentSupply) throw;
 
        currentSupply = safeSubtract(currentSupply, value);
        DecreaseSupply(value);
    }
 
    ///  启动区块检测 异常的处理
    function startFunding (uint256 _fundingStartBlock, uint256 _fundingStopBlock) isOwner external {
        if (isFunding) throw;
        if (_fundingStartBlock >= _fundingStopBlock) throw;
        if (block.number >= _fundingStartBlock) throw;
 
        fundingStartBlock = _fundingStartBlock;
        fundingStopBlock = _fundingStopBlock;
        isFunding = true;
    }
 
    ///  关闭区块异常处理
    function stopFunding() isOwner external {
        if (!isFunding) throw;
        isFunding = false;
    }
 
    /// 开发了一个新的合同来接收token（或者更新token）
    function setMigrateContract(address _newContractAddr) isOwner external {
        if (_newContractAddr == newContractAddr) throw;
        newContractAddr = _newContractAddr;
    }
 
    /// 设置新的所有者地址
    function changeOwner(address _newFundDeposit) isOwner() external {
        if (_newFundDeposit == address(0x0)) throw;
        ethFundDeposit = _newFundDeposit;
    }
 
    ///转移token到新的合约
    function migrate() external {
        if(isFunding) throw;
        if(newContractAddr == address(0x0)) throw;
 
        uint256 tokens = balances[msg.sender];
        if (tokens == 0) throw;
 
        balances[msg.sender] = 0;
        tokenMigrated = safeAdd(tokenMigrated, tokens);
 
        IMigrationContract newContract = IMigrationContract(newContractAddr);
        if (!newContract.migrate(msg.sender, tokens)) throw;
 
        Migrate(msg.sender, tokens);               // log it
    }
 
    /// 转账ETH 到RATC团队
    function transferETH() isOwner external {
        if (this.balance == 0) throw;
        if (!ethFundDeposit.send(this.balance)) throw;
    }
 
    ///  将RATC token分配到预处理地址。
    function allocateToken (address _addr, uint256 _eth) isOwner external {
        if (_eth == 0) throw;
        if (_addr == address(0x0)) throw;
 
        uint256 tokens = safeMult(formatDecimals(_eth), tokenExchangeRate);
        if (tokens + tokenRaised > currentSupply) throw;
 
        tokenRaised = safeAdd(tokenRaised, tokens);
        balances[_addr] += tokens;
 
        AllocateToken(_addr, tokens);  // 记录token日志
    }
 
    /// 购买token
    function () payable {
        if (!isFunding) throw;
        if (msg.value == 0) throw;
 
        if (block.number < fundingStartBlock) throw;
        if (block.number > fundingStopBlock) throw;
 
        uint256 tokens = safeMult(msg.value, tokenExchangeRate);
        if (tokens + tokenRaised > currentSupply) throw;
 
        tokenRaised = safeAdd(tokenRaised, tokens);
        balances[msg.sender] += tokens;
 
        IssueToken(msg.sender, tokens);  //记录日志
    }
}
function setTokenExchangeRate(uint256 _tokenExchangeRate) isOwner external {
    if (_tokenExchangeRate == 0) throw;
    if (_tokenExchangeRate == tokenExchangeRate) throw;
 
    tokenExchangeRate = _tokenExchangeRate;
}

///  设置token汇率