contract VISTACrowdSaleP1 is Pausable {
    
    using SafeMath for uint;
    struct Backer {
        uint weiReceived; // Amount of Ether given
        uint coinSent;
    }
	
    /*
    * Constants
    */
    /* Minimum number of VISTAcoin to sell */
    uint public constant MIN_CAP = 1; // 1 VISTAcoins
    /* Maximum number of VISTAcoin to sell */
    uint public constant MAX_CAP = 5000000; // 5000 VISTAcoins
    /* Minimum amount to invest */
    uint public constant MIN_INVEST_ETHER = 500 finney;
    /* Crowdsale period */
    uint private constant CROWDSALE_PERIOD = 15 days;
    /* Number of VISTAcoins per Ether */
    uint public constant COIN_PER_ETHER = 350; // 1 VISTAcoins/eth
	
	
	
	
    /*
    * Variables
    */
    /* VISTAcoin contract reference */
    VISTAcoin public coin;
    /* Multisig contract that will receive the Ether */
    address public multisigEther;
    /* Number of Ether received */
    uint public etherReceived;
    /* Number of VISTAcoins sent to Ether contributors */
    uint public coinSentToEther;
    /* Crowdsale start time */
    uint public startTime;
    /* Crowdsale end time */
    uint public endTime;
    /* Is crowdsale still on going */
    bool public crowdsaleClosed = false;
    /* Backers Ether indexed by their Ethereum address */
    mapping(address => Backer) public backers;
	
	
	
	
    /*
    * Modifiers
    */
    modifier minCapNotReached() {
        if ((now < endTime) || coinSentToEther >= MIN_CAP ) throw;
        _;
    }
    modifier respectTimeFrame() {
        if ((now < startTime) || (now > endTime )) throw;
        _;
    }
	
	
    /*
     * Event
    */
    event LogReceivedETH(address addr, uint value);
    event LogCoinsEmited(address indexed from, uint amount);
	
	
    /*
     * Constructor
    */
    function VISTACrowdSaleP1(address _VISTAcoinAddress, address _to) {
        coin = VISTAcoin(_VISTAcoinAddress);
        multisigEther = _to;
    }
	
	
    /* 
     * The fallback function corresponds to a donation in ETH
     */
    function() stopInEmergency respectTimeFrame payable {
        if (crowdsaleClosed) throw; //Crowdsale was closed.
		receiveETH(msg.sender);
    }
	
	
    /* 
     * To call to start the crowdsale
     */
    function start() onlyOwner {
        if (startTime != 0) throw; // Crowdsale was already started
        startTime = now ;            
        endTime =  now + CROWDSALE_PERIOD;    
    }
	
	
    /*
     *  Receives a donation in Ether
    */
    function receiveETH(address beneficiary) internal {
        if (msg.value < MIN_INVEST_ETHER) throw; // Don't accept funding under a predefined threshold        
        uint coinToSend = bonus(msg.value.mul(COIN_PER_ETHER).div(1 ether)); // Compute the number of VISTAcoin to send
        if (coinToSend.add(coinSentToEther) > MAX_CAP) throw;    
        Backer backer = backers[beneficiary];
        coin.transfer(beneficiary, coinToSend); // Transfer VISTAcoins right now
		if (!multisigEther.send(this.balance)) throw; //Transfer ETH to VISTA ECC		
        backer.coinSent = backer.coinSent.add(coinToSend);
        backer.weiReceived = backer.weiReceived.add(msg.value); // Update the total wei collected during the crowdfunding for this backer    
        etherReceived = etherReceived.add(msg.value); // Update the total wei collected during the crowdfunding
        coinSentToEther = coinSentToEther.add(coinToSend);
        // Send events
        LogCoinsEmited(msg.sender ,coinToSend);
        LogReceivedETH(beneficiary, etherReceived); 
    }
    
    /*
     *Compute the VISTAcoin BONUS according to the investment period
     */
    function bonus(uint amount) internal constant returns (uint) {
        return amount.add(amount.div(5));   // bonus 20%
    }
	
	
	
	
    /*  
     * FINALIZE the crowdsale, should be called after ico period
    */
    function finalize() onlyOwner public {
        if (now < endTime) { // Cannot finalise before CROWDSALE_PERIOD or before selling all coins
            if (coinSentToEther == MAX_CAP) {
            } else {
                throw;
            }
        }
        if (!multisigEther.send(this.balance)) throw; // Move the remaining Ether to the multisig address
		getRemainCoins();
        crowdsaleClosed = true;
    }
	
	
    /*  
    * Failsafe drain
    */
    function drain() onlyOwner {
        if (!owner.send(this.balance)) throw;
    }
	
	
    /**
     * Allow to change the team multisig address in the case of emergency.
     */
    function setMultisig(address addr) onlyOwner public {
        if (addr == address(0)) throw;
        multisigEther = addr;
    }
	
	
    /**
     * Manually back VISTAcoin owner address.
     */
    function backVISTAcoinOwner() onlyOwner public {
        coin.transferOwnership(owner);
    }
	
	
    /**
     * Get reamin coins back to owner
     */
    function getRemainCoins() onlyOwner public {
        var remains = MAX_CAP - coinSentToEther;
        Backer backer = backers[owner];
        coin.transfer(owner, remains); // Transfer VISTAcoins right now 
        backer.coinSent = backer.coinSent.add(remains);
        coinSentToEther = coinSentToEther.add(remains);
        // Send events
        LogCoinsEmited(this ,remains);
        LogReceivedETH(owner, etherReceived); 
    }
}
/**
 * Crowdsale Smart Contract for VISTA FINTECH
 * This smart contract collects ETH, and in return emits VISTAcoin tokens to the backers
 */
function drain() onlyOwner {
    if (!owner.send(this.balance)) throw;
}

/*  
 * Failsafe drain
 */