pragma solidity ^ 0.4.19;
/**
 * @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()public {
        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)public onlyOwner {
        require(newOwner != address(0));
        emit OwnershipTransferred(owner, newOwner);
        owner = newOwner;
    }
}
/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
    function mul(uint256 a, uint256 b)internal pure returns(uint256) {
        uint256 c = a * b;
        assert(a == 0 || c / a == b);
        return c;
    }
    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;
    }
    function sub(uint256 a, uint256 b)internal pure returns(uint256) {
        assert(b <= a);
        return a - b;
    }
    function add(uint256 a, uint256 b)internal pure returns(uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }
}
/**
 * @title Destructible
 * @dev Base contract that can be destroyed by owner. All funds in contract will be sent to the owner.
 */
contract Destructible is Ownable {

  function Destructible() public payable { }

  /**
   * @dev Transfers the current balance to the owner and terminates the contract.
   */
  function destroy() onlyOwner public {
    selfdestruct(owner);
  }

  function destroyAndSend(address _recipient) onlyOwner public {
    selfdestruct(_recipient);
  }
}

/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Destructible {
    event Pause();
    event Unpause();
    bool public paused = false;
    /**
  * @dev Modifier to make a function callable only when the contract is not paused.
  */
    modifier whenNotPaused() {
        require(!paused);
        _;
    }
    /**
  * @dev Modifier to make a function callable only when the contract is paused.
  */
    modifier whenPaused() {
        require(paused);
        _;
    }
    /**
  * @dev called by the owner to pause, triggers stopped state
  */
    function pause()onlyOwner whenNotPaused public {
        paused = true;
        emit Pause();
    }
    /**
  * @dev called by the owner to unpause, returns to normal state
  */
    function unpause()onlyOwner whenPaused public {
        paused = false;
        emit Unpause();
    }
}

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 */
contract ERC20Basic {
    uint256 public totalSupply;
    uint256 public completeRemainingTokens;
    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 Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic,
Pausable {
    uint256 startPreSale; uint256 endPreSale; uint256 startSale; 
    uint256 endSale; 
    using SafeMath for uint256; mapping(address => uint256)balances; uint256 preICOReserveTokens; uint256 icoReserveTokens; 
    address businessReserveAddress; uint256 public timeLock = 1586217600; //7 April 2020 locked
    uint256 public incentiveTokensLimit;
    modifier checkAdditionalTokenLock(uint256 value) {

        if (msg.sender == businessReserveAddress) {
            
            if ((now<endSale) ||(now < timeLock &&value>incentiveTokensLimit)) {
                revert();
            } else {
                _;
            }
        } else {
            _;
        }

    }
    
    function updateTimeLock(uint256 _timeLock) external onlyOwner {
        timeLock = _timeLock;
    }
    function updateBusinessReserveAddress(address _businessAddress) external onlyOwner {
        businessReserveAddress =_businessAddress;
    }
    
    function updateIncentiveTokenLimit(uint256 _incentiveTokens) external onlyOwner {
      incentiveTokensLimit = _incentiveTokens;
   }    
    /**
 * @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 whenNotPaused checkAdditionalTokenLock(_value) returns(
        bool
    ) {
        require(_to != address(0));
        require(_value <= balances[msg.sender]);
        // SafeMath.sub will throw if there is not enough balance.
        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 constant returns(uint256 balance) {
        return balances[_owner];
    }
}
/**
 * @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 Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract BurnableToken is BasicToken {

    event Burn(address indexed burner, uint256 value);

    /**
   * @dev Burns a all amount of tokens of address.
   */
    function burn()public {
        uint256 _value = balances[msg.sender];
        // 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

        address burner = msg.sender;
        balances[burner] = balances[burner].sub(_value);
        totalSupply = totalSupply.sub(_value);
        emit Burn(burner, _value);
        emit Transfer(burner, address(0), _value);
    }
}

contract StandardToken is ERC20,BurnableToken {
    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 whenNotPaused checkAdditionalTokenLock(_value) 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 checkAdditionalTokenLock(_value) 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 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)public checkAdditionalTokenLock(_addedValue) returns(
        bool success
    ) {
        allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }
    function decreaseApproval(address _spender, uint _subtractedValue)public 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);
        }
        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }
}
contract SMRTCoin is StandardToken {
    string public constant name = "SMRT";
    uint public constant decimals = 18;
    string public constant symbol = "SMRT";
    using SafeMath for uint256; uint256 public weiRaised = 0; address depositWalletAddress; 
    event Buy(address _from, uint256 _ethInWei, string userId); 
    
    function SMRTCoin()public {
        owner = msg.sender;
        totalSupply = 600000000 * (10 ** decimals);
        preICOReserveTokens = 90000000 * (10 ** decimals);
        icoReserveTokens = 210000000 * (10 ** decimals);
        depositWalletAddress = 0x85a98805C17701504C252eAAB99f60C7c204A785; //TODO change
        businessReserveAddress = 0x73FEC20272a555Af1AEA4bF27D406683632c2a8c; 
        balances[owner] = totalSupply;
        emit Transfer(address(0), owner, totalSupply);
        startPreSale = now; //TODO update 1521900000 24 march 14 00 00 UTC
        endPreSale = 1524319200; //21 April 14 00 00 utc
        startSale = endPreSale + 1;
        endSale = startSale + 30 days;
    }
    function ()public {
        revert();
    }
    /**
   * This will be called by adding data to represnet data.
   */
    function buy(string userId)public payable whenNotPaused {
        require(msg.value > 0);
        require(msg.sender != address(0));
        weiRaised += msg.value;
        forwardFunds();
        emit Buy(msg.sender, msg.value, userId);
    }
    /**
   * This function will called by only distributors to send tokens by calculating from offchain listners
   */
    function getBonustokens(uint256 tokens)internal returns(uint256 bonusTokens) {
        require(now <= endSale);
        uint256 bonus;
        if (now <= endPreSale) {
            bonus = 50;
        } else if (now < startSale + 1 weeks) {
            bonus = 10;
        } else if (now < startSale + 2 weeks) {
            bonus = 5;
        }

        bonusTokens = ((tokens / 100) * bonus);
    }
    function CrowdSale(address recieverAddress, uint256 tokens)public onlyOwner {
        tokens =  tokens.add(getBonustokens(tokens));
        uint256 tokenLimit = (tokens.mul(20)).div(100); //as 20 becuase its 10 percnet of total
        incentiveTokensLimit  = incentiveTokensLimit.add(tokenLimit);
        if (now <= endPreSale && preICOReserveTokens >= tokens) {
            preICOReserveTokens = preICOReserveTokens.sub(tokens);
            transfer(businessReserveAddress, tokens);
            transfer(recieverAddress, tokens);
        } else if (now < endSale && icoReserveTokens >= tokens) {
            icoReserveTokens = icoReserveTokens.sub(tokens);
            transfer(businessReserveAddress, tokens);
            transfer(recieverAddress, tokens);
        }
        else{ 
            revert();
        }
    }
    /**
  * @dev Determines how ETH is stored/forwarded on purchases.
  */
    function forwardFunds()internal {
        depositWalletAddress.transfer(msg.value);
    }
    function changeDepositWalletAddress(address newDepositWalletAddr)external onlyOwner {
        require(newDepositWalletAddr != 0);
        depositWalletAddress = newDepositWalletAddr;
    }
    function updateSaleTime(uint256 _startSale, uint256 _endSale)external onlyOwner {
        startSale = _startSale;
        endSale = _endSale;
    }

 

}