pragma solidity ^0.4.24;

/******************************************/
/*      Netkiller Crowdsale Contract      */
/******************************************/
/* Author netkiller <netkiller@msn.com>   */
/* Home http://www.netkiller.cn           */
/* Version 2018-06-07 - Solc ver: 0.4.24  */
/******************************************/

interface token {
    function transfer(address receiver, uint amount) external;
}

contract Crowdsale {
    address public beneficiary;
    uint public fundingGoal;
    uint public amountRaised;
    uint public deadline;
    uint public price;
    token public tokenReward;
    mapping(address => uint256) public balanceOf;
    bool fundingGoalReached = false;
    bool crowdsaleClosed = false;

    event GoalReached(address recipient, uint totalAmountRaised);
    event FundTransfer(address backer, uint amount, bool isContribution);

    /**
     * Constructor function
     *
     * Setup the owner
     */
    constructor(
        address ifSuccessfulSendTo,
        uint fundingGoalInEthers,
        uint durationInMinutes,
        uint etherCostOfEachToken,
        address addressOfTokenUsedAsReward
    ) public {
        beneficiary = ifSuccessfulSendTo;
        fundingGoal = fundingGoalInEthers * 1 ether;
        deadline = now + durationInMinutes * 1 minutes;
        price = etherCostOfEachToken * 1 ether;
        tokenReward = token(addressOfTokenUsedAsReward);
    }

    /**
     * Fallback function
     *
     * The function without name is the default function that is called whenever anyone sends funds to a contract
     */
    function () payable public{
        require(!crowdsaleClosed);
        uint amount = msg.value;
        balanceOf[msg.sender] += amount;
        amountRaised += amount;
        tokenReward.transfer(msg.sender, amount / price);
        emit FundTransfer(msg.sender, amount, true);
    }

    modifier afterDeadline() { if (now >= deadline) _; }

    /**
     * Check if goal was reached
     *
     * Checks if the goal or time limit has been reached and ends the campaign
     */
    function checkGoalReached() afterDeadline public{
        if (amountRaised >= fundingGoal){
            fundingGoalReached = true;
            emit GoalReached(beneficiary, amountRaised);
        }
        crowdsaleClosed = true;
    }


    /**
     * Withdraw the funds
     *
     * Checks to see if goal or time limit has been reached, and if so, and the funding goal was reached,
     * sends the entire amount to the beneficiary. If goal was not reached, each contributor can withdraw
     * the amount they contributed.
     */
    function safeWithdrawal() afterDeadline public{
        if (!fundingGoalReached) {
            uint amount = balanceOf[msg.sender];
            balanceOf[msg.sender] = 0;
            if (amount > 0) {
                if (msg.sender.send(amount)) {
                    emit FundTransfer(msg.sender, amount, false);
                } else {
                    balanceOf[msg.sender] = amount;
                }
            }
        }

        if (fundingGoalReached && beneficiary == msg.sender) {
            if (beneficiary.send(amountRaised)) {
                emit FundTransfer(beneficiary, amountRaised, false);
            } else {
                //If we fail to send the funds to beneficiary, unlock funders balance
                fundingGoalReached = false;
            }
        }
    }
}
			
			

			
pragma solidity ^0.4.21;

interface token {
    function transfer(address receiver, uint amount) external;
}

contract Crowdsale {
    address public beneficiary; // 募資成功後的收款地址
    uint public fundingGoal;    // 募資額度
    uint public amountRaised;   // 參與數量
    uint public deadline;       // 募資截止期

    uint public price;          // token 與以太坊的匯率, token賣多少錢
    token public tokenReward;   // 要賣的token

    mapping(address => uint256) public balanceOf;

    bool fundingGoalReached = false;    // 眾籌是否達到目標
    bool crowdsaleClosed = false;       // 眾籌是否結束

    /**
    * 事件可以用來跟蹤信息
    **/
    event GoalReached(address recipient, uint totalAmountRaised);
    event FundTransfer(address backer, uint amount, bool isContribution);

    /**
     * 建構子, 設置相關屬性
     */
    function Crowdsale(
        address ifSuccessfulSendTo,
        uint fundingGoalInEthers,
        uint durationInMinutes,
        uint finneyCostOfEachToken,
        address addressOfTokenUsedAsReward) public {
            beneficiary = ifSuccessfulSendTo;					//募資成功後的收款賬號
            fundingGoal = fundingGoalInEthers * 1 ether;		//募資額度
            deadline = now + durationInMinutes * 1 minutes;		//募資時間
            price = finneyCostOfEachToken * 1 finney;			//每個代幣的價格, 這裡為了方便使用了單位finney及值為：1 （1 ether = 1000 finney）
            tokenReward = token(addressOfTokenUsedAsReward);   	// 代幣合約地址。傳入已發佈的 token 合約的地址來創建實例
    }

    /**
     * 無函數名的Fallback函數，
     * 在向合約轉賬時，這個函數會被調用
     */
    function () payable public {
        require(!crowdsaleClosed);
        uint amount = msg.value;
        balanceOf[msg.sender] += amount;
        amountRaised += amount;
        tokenReward.transfer(msg.sender, amount / price);
        emit FundTransfer(msg.sender, amount, true);
    }

    /**
    *  定義函數修改器modifier
    * 用於在函數執行前檢查某種前置條件（判斷通過之後才會繼續執行該方法）
    * _ 表示繼續執行之後的代碼
    **/
    modifier afterDeadline() { if (now >= deadline) _; }

    /**
     * 判斷眾籌是否完成融資目標， 這個方法使用了afterDeadline函數修改器
     *
     */
    function checkGoalReached() afterDeadline public{
        if (amountRaised >= fundingGoal) {
            fundingGoalReached = true;
            emit GoalReached(beneficiary, amountRaised);
        }
        crowdsaleClosed = true;
    }


    /**
     * 完成融資目標時，融資款發送到收款方
     * 未完成融資目標時，執行退款
     *
     */
    function safeWithdrawal() afterDeadline public{
        if (!fundingGoalReached) {
            uint amount = balanceOf[msg.sender];
            balanceOf[msg.sender] = 0;
            if (amount > 0) {
                if (msg.sender.send(amount)) {
                    emit FundTransfer(msg.sender, amount, false);
                } else {
                    balanceOf[msg.sender] = amount;
                }
            }
        }

        if (fundingGoalReached && beneficiary == msg.sender) {
            if (beneficiary.send(amountRaised)) {
                emit FundTransfer(beneficiary, amountRaised, false);
            } else {
                //If we fail to send the funds to beneficiary, unlock funders balance
                fundingGoalReached = false;
            }
        }
    }
}