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pragma solidity 0.5.8;
import "@openzeppelin/contracts/math/SafeMath.sol";
contract Campaign {
using SafeMath for uint256;
enum State {
Fundraising,
Funded,
Failed,
Successful
}
address payable public creator;
string public title;
string public description;
uint256 public currentBalance;
uint public goal;
uint public completeAt;
uint public raiseBy;
uint public successBy;
State public state = State.Fundraising;
uint public totalContributions = 0;
uint public stages;
uint256 public balancePerStage;
mapping (address => uint) public contributions;
mapping (address => uint) public votes;
uint public agrees = 0;
uint public currentStage = 1;
event FundingReceived(address contributor, uint amount, uint currentTotal);
event CreatorPaidStage(address recipient);
modifier inState(State _state) {
require(state == _state);
_;
}
modifier isCreator() {
require(msg.sender == creator);
_;
}
constructor
(
address payable _creator,
string memory _title,
string memory _description,
uint _stages,
uint _raiseBy,
uint _successBy,
uint _goal
) public {
creator = _creator;
title = _title;
description = _description;
stages = _stages;
goal = _goal;
successBy = _successBy;
raiseBy = _raiseBy;
agrees = 0;
}
function contribute() external inState(State.Fundraising) payable {
require(msg.sender != creator);
require(msg.value >= goal / 100);
if (contributions[msg.sender] == 0) {
totalContributions += 1;
}
contributions[msg.sender] = contributions[msg.sender].add(msg.value);
currentBalance = currentBalance.add(msg.value);
emit FundingReceived(msg.sender, msg.value, currentBalance);
checkFunded();
}
function checkFunded() public {
if (currentBalance >= goal) {
balancePerStage = currentBalance.div(stages);
state = State.Funded;
} else if (now > raiseBy) {
state = State.Failed;
}
completeAt = now;
}
function vote() external inState(State.Funded) {
if (now > successBy) {
state = State.Failed;
revert();
}
require(msg.sender != creator);
require(contributions[msg.sender] > 0);
require(votes[msg.sender] != currentStage);
votes[msg.sender] = currentStage;
agrees += 1;
if (agrees >= totalContributions / 2) {
agrees = 0;
payStage();
if (currentStage == stages) {
state = State.Successful;
} else {
currentStage += 1;
}
}
}
function payStage() internal inState(State.Funded) returns (bool) {
uint256 totalRaised = currentBalance;
currentBalance = currentBalance.sub(balancePerStage);
if (creator.send(balancePerStage)) {
emit CreatorPaidStage(creator);
return true;
} else {
currentBalance = totalRaised;
state = State.Successful;
}
return false;
}
function getProperties() external view returns
(
address payable _creator,
string memory _title,
string memory _description,
uint256 _stages,
uint256 _currentStage,
uint256 _raiseBy,
uint256 _successBy,
State _state,
uint256 _currentBalance,
uint256 _goal
) {
_creator = creator;
_title = title;
_description = description;
_stages = stages;
_currentStage = currentStage;
_raiseBy = raiseBy;
_successBy = successBy;
_state = state;
_currentBalance = currentBalance;
_goal = goal;
}
}
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