//SPDX-License-Identifier: UNLICENSED
pragma solidity >=0.5.0 < 0.9.0;
contract CrowdFunding{
mapping(address=>uint) public contributors; //contributors[msg.sender]=100
address public manager;
uint public minimumContribution;
uint public deadline;
uint public target;
uint public raisedAmount;
uint public noOfContributors;
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;
constructor(uint _target,uint _deadline){
target=_target;
deadline=block.timestamp+_deadline; //10sec + 3600sec (60*60)
minimumContribution=100 wei;
manager=msg.sender;
}
function sendEth() public payable{
require(block.timestamp < deadline,”Deadline has passed”);
require(msg.value >=minimumContribution,”Minimum Contribution is not met”);
if(contributors[msg.sender]==0){
noOfContributors++;
}
contributors[msg.sender]+=msg.value;
raisedAmount+=msg.value;
}
function getContractBalance() public view returns(uint){
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]);
contributors[msg.sender]=0;
}
modifier onlyManger(){
require(msg.sender==manager,”Only manager can calll this function”);
_;
}
function createRequests(string memory _description,address payable _recipient,uint _value) public onlyManger{
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 contributor”);
Request storage thisRequest=requests[_requestNo];
require(thisRequest.voters[msg.sender]==false,”You have already voted”);
thisRequest.voters[msg.sender]=true;
thisRequest.noOfVoters++;
}
function makePayment(uint _requestNo) public onlyManger{
require(raisedAmount>=target);
Request storage thisRequest=requests[_requestNo];
require(thisRequest.completed==false,”The request has been completed”);
require(thisRequest.noOfVoters > noOfContributors/2,”Majority does not support”);
thisRequest.recipient.transfer(thisRequest.value);
thisRequest.completed=true;
}
}
