simplified-crowdsale

/**
 *Submitted for verification at Etherscan.io on 2019-09-19
*/

pragma solidity ^0.5.11;
contract CrowdSale{

    mapping (address=> uint256) public contributions;
    uint256 public totalRaised;
    uint256 public maxAmount;
    uint256 public saleEndTimeStamp;
    bool public saleActive;
    address public admin;

    // constructor to enable basic parameters of the crowdsale
    constructor(uint256 _maxAmount, bool _saleActive, uint256 _saleEndTimeStamp) public {
        admin = msg.sender;
        // Max amount limit
        maxAmount = _maxAmount;
        // Sale status on launch
        saleActive = _saleActive;
        // Sale end time
        saleEndTimeStamp = _saleEndTimeStamp;
    }

    // Function to deposit ETH for the crowdsale
    function contribute() public payable returns (bool){
        require(msg.value > 0, "Deposit ETH along with the function");
        require(msg.value + totalRaised < maxAmount, "Crowdsale limit reached");
        require(saleActive, "Sale hasn't started or has ended");
        require(now < saleEndTimeStamp, "Sale has ended");
        contributions[msg.sender] = msg.value;
        totalRaised = totalRaised + msg.value;
        return true;
    }


    // Function to end crowdsale and distribute funds to admin
    function endCrowdSale() public {
        require(msg.sender == admin, "Only admin can end the sale");
        saleActive = false;
        msg.sender.transfer(totalRaised);
    }


}