pragma solidity ^0.4.18;

interface OysterPearl {
    function balanceOf(address _owner) public constant returns (uint256 balance);
    function transfer(address _to, uint256 _value) public;
}
//AIRDROP SALE
contract PearlBonus {
    address public pearlContract = 0x1844b21593262668B7248d0f57a220CaaBA46ab9;
    OysterPearl pearl = OysterPearl(pearlContract);
    
    address public director;
    uint256 public funds;
    bool public saleClosed;
    
    function PearlBonus() public {
        director = msg.sender;
        funds = 0;
        saleClosed = false;
    }
    
    modifier onlyDirector {
        // Only the director is permitted
        require(msg.sender == director);
        _;
    }
    
    /**
     * Director can close the crowdsale
     */
    function closeSale() public onlyDirector returns (bool success) {
        // The sale must be currently open
        require(!saleClosed);
        
        // Lock the crowdsale
        saleClosed = true;
        return true;
    }

    /**
     * Director can open the crowdsale
     */
    function openSale() public onlyDirector returns (bool success) {
        // The sale must be currently closed
        require(saleClosed);
        
        // Unlock the crowdsale
        saleClosed = false;
        return true;
    }
    
    function transfer(address _send, uint256 _amount) public onlyDirector {
        pearl.transfer(_send, _amount);
    }
    
    /**
     * Transfers the director to a new address
     */
    function transferDirector(address newDirector) public onlyDirector {
        director = newDirector;
    }
    
    /**
     * Withdraw funds from the contract (failsafe)
     */
    function withdrawFunds() public onlyDirector {
        director.transfer(this.balance);
    }

     /**
     * Crowdsale function
     */
    function () public payable {
        // Check if crowdsale is still active
        require(!saleClosed);
        
        // Minimum amount is 1 finney
        require(msg.value >= 1 finney);
        
        // Airdrop price is 1 ETH = 50000 PRL
        uint256 amount = msg.value * 50000;
        
        require(amount <= pearl.balanceOf(this));
        
        pearl.transfer(msg.sender, amount);
        
        // Track ETH amount raised
        funds += msg.value;
        
        // Auto withdraw
        director.transfer(this.balance);
    }
}