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CrowdFunding.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity >= 0.5.0 < 0.9.0;

contract CrowdFunding{
    mapping(address=>uint) public contributors;
    address public manager;
    uint public minimumContribution;
    uint public deadline;
    uint public target;
    uint public raisedAmount;
    uint public noOfContributors;

    constructor(uint _target,uint _deadline){
        target = _target;
        deadline = block.timestamp + _deadline;
        minimumContribution = 100 wei;
        manager = msg.sender;
    }

    struct Request{
        string description;
        address payable recipient;
        uint value;
        bool completed;
        uint noOfVoters;
        mapping(address=>bool) voters;
    }
    mapping(uint=>Request) public requests;
    uint public numRequests;

    function sendWei() public payable{
        require(block.timestamp < deadline,"Deadline has been passed");
        require(msg.value >= minimumContribution,"Minimum Contibution has not met");

        if(contributors[msg.sender] == 0){
            noOfContributors++;
        }

        contributors[msg.sender]+=msg.value;
        raisedAmount+=msg.value;
    }
    function getContractBalance() public view returns(uint){
        require(msg.sender==manager);
        return address(this).balance;
    }
    function refund() public{
        require(block.timestamp>deadline && raisedAmount<target,"You are not eligible for refund");
        require(contributors[msg.sender]>0);
        address payable user = payable(msg.sender);
        user.transfer(contributors[msg.sender]);
    }

    function sendRequest(string memory _description,address payable _recipient,uint _value) public{
        require(msg.sender==manager,"Only Manager Can Call THis Function");
        Request storage newRequest = requests[numRequests];
        numRequests++;
        newRequest.description = _description;
        newRequest.recipient = _recipient;
        newRequest.value = _value;
        newRequest.completed = false;
        newRequest.noOfVoters = 0;
    }
    function voteRequest(uint _requestNo) public{
        require(contributors[msg.sender] > 0,"You must be a Contributor");
        Request storage thisRequest = requests[_requestNo];
        require(thisRequest.voters[msg.sender] == false,"You have Voted Once");
        thisRequest.voters[msg.sender] = true;
        thisRequest.noOfVoters++;
    }
    function makePayment(uint _requestNo) public{
        require(msg.sender==manager);
        require(raisedAmount>=target);
        Request storage thisRequest= requests[_requestNo];
        require(thisRequest.completed == false,"The request has been completed");
        require(thisRequest.noOfVoters > noOfContributors/2,"You loose on Voting");
        thisRequest.recipient.transfer(thisRequest.value);
        thisRequest.completed=true;
    }
      

}