Farmtron

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Smart-contract code:
pragma solidity 0.5.10;
                                                        
                                                        contract Farmtron {
                                                                using SafeMath for uint256;
                                                        
                                                                uint256 constant public INVEST_MIN_AMOUNT = 100 trx;
                                                                uint256 constant public BASE_PERCENT = 80;
                                                                uint256[] public REFERRAL_PERCENTS = [70, 20, 5,5,5,5,5,5,5,];
                                                                uint256 constant public MARKETING_FEE = 80;
                                                                uint256 constant public PROJECT_FEE = 20;
                                                                uint256 constant public PERCENTS_DIVIDER = 1000;
                                                                uint256 constant public CONTRACT_BALANCE_STEP = 1000000 trx;
                                                                uint256 constant public TIME_STEP = 1 days;
                                                        
                                                                uint256 public totalUsers;
                                                                uint256 public totalInvested;
                                                                uint256 public totalWithdrawn;
                                                                uint256 public totalDeposits;
                                                        
                                                                address payable public marketingAddress;
                                                                address payable public projectAddress;
                                                        
                                                                struct Deposit {
                                                                        uint256 amount;
                                                                        uint256 withdrawn;
                                                                        uint256 start;
                                                                }
                                                        
                                                                struct User {
                                                                        Deposit[] deposits;
                                                                        uint256 checkpoint;
                                                                        address referrer;
                                                                        uint256 bonus;
                                                                }
                                                        
                                                                mapping (address => User) internal users;
                                                        
                                                                event Newbie(address user);
                                                                event NewDeposit(address indexed user, uint256 amount);
                                                                event Withdrawn(address indexed user, uint256 amount);
                                                                event RefBonus(address indexed referrer, address indexed referral, uint256 indexed level, uint256 amount);
                                                                event FeePayed(address indexed user, uint256 totalAmount);
                                                        
                                                                constructor(address payable marketingAddr, address payable projectAddr) public {
                                                                        require(!isContract(marketingAddr) && !isContract(projectAddr));
                                                                        marketingAddress = marketingAddr;
                                                                        projectAddress = projectAddr;
                                                                }
                                                        
                                                                function invest(address referrer) public payable {
                                                                        require(msg.value >= INVEST_MIN_AMOUNT);
                                                        
                                                                        marketingAddress.transfer(msg.value.mul(MARKETING_FEE).div(PERCENTS_DIVIDER));
                                                                        projectAddress.transfer(msg.value.mul(PROJECT_FEE).div(PERCENTS_DIVIDER));
                                                                        emit FeePayed(msg.sender, msg.value.mul(MARKETING_FEE.add(PROJECT_FEE)).div(PERCENTS_DIVIDER));
                                                        
                                                                        User storage user = users[msg.sender];
                                                        
                                                                        if (user.referrer == address(0) && users[referrer].deposits.length > 0 && referrer != msg.sender) {
                                                                                user.referrer = referrer;
                                                                        }
                                                        
                                                                        if (user.referrer != address(0)) {
                                                        
                                                                                address upline = user.referrer;
                                                                                for (uint256 i = 0; i < 3; i++) {
                                                                                        if (upline != address(0)) {
                                                                                                uint256 amount = msg.value.mul(REFERRAL_PERCENTS[i]).div(PERCENTS_DIVIDER);
                                                                                                users[upline].bonus = users[upline].bonus.add(amount);
                                                                                                emit RefBonus(upline, msg.sender, i, amount);
                                                                                                upline = users[upline].referrer;
                                                                                        } else break;
                                                                                }
                                                        
                                                                        }
                                                        
                                                                        if (user.deposits.length == 0) {
                                                                                user.checkpoint = block.timestamp;
                                                                                totalUsers = totalUsers.add(1);
                                                                                emit Newbie(msg.sender);
                                                                        }
                                                        
                                                                        user.deposits.push(Deposit(msg.value, 0, block.timestamp));
                                                        
                                                                        totalInvested = totalInvested.add(msg.value);
                                                                        totalDeposits = totalDeposits.add(1);
                                                        
                                                                        emit NewDeposit(msg.sender, msg.value);
                                                        
                                                                }
                                                        
                                                                function withdraw() public {
                                                                        User storage user = users[msg.sender];
                                                        
                                                                        uint256 userPercentRate = getUserPercentRate(msg.sender);
                                                        
                                                                        uint256 totalAmount;
                                                                        uint256 dividends;
                                                        
                                                                        for (uint256 i = 0; i < user.deposits.length; i++) {
                                                        
                                                                                if (user.deposits[i].withdrawn < user.deposits[i].amount.mul(2)) {
                                                        
                                                                                        if (user.deposits[i].start > user.checkpoint) {
                                                        
                                                                                                dividends = (user.deposits[i].amount.mul(userPercentRate).div(PERCENTS_DIVIDER))
                                                                                                        .mul(block.timestamp.sub(user.deposits[i].start))
                                                                                                        .div(TIME_STEP);
                                                        
                                                                                        } else {
                                                        
                                                                                                dividends = (user.deposits[i].amount.mul(userPercentRate).div(PERCENTS_DIVIDER))
                                                                                                        .mul(block.timestamp.sub(user.checkpoint))
                                                                                                        .div(TIME_STEP);
                                                        
                                                                                        }
                                                        
                                                                                        if (user.deposits[i].withdrawn.add(dividends) > user.deposits[i].amount.mul(2)) {
                                                                                                dividends = (user.deposits[i].amount.mul(2)).sub(user.deposits[i].withdrawn);
                                                                                        }
                                                        
                                                                                        user.deposits[i].withdrawn = user.deposits[i].withdrawn.add(dividends); /// changing of storage data
                                                                                        totalAmount = totalAmount.add(dividends);
                                                        
                                                                                }
                                                                        }
                                                        
                                                                        uint256 referralBonus = getUserReferralBonus(msg.sender);
                                                                        if (referralBonus > 0) {
                                                                                totalAmount = totalAmount.add(referralBonus);
                                                                                user.bonus = 0;
                                                                        }
                                                        
                                                                        require(totalAmount > 0, "User has no dividends ");
                                                        
                                                                        uint256 contractBalance = address(this).balance;
                                                                        if (contractBalance < totalAmount) {
                                                                                totalAmount = contractBalance;
                                                                        }
                                                        
                                                                        user.checkpoint = block.timestamp;
                                                        
                                                                        msg.sender.transfer(totalAmount);
                                                        
                                                                        totalWithdrawn = totalWithdrawn.add(totalAmount);
                                                        
                                                                        emit Withdrawn(msg.sender, totalAmount);
                                                        
                                                                }
                                                        
                                                                function getContractBalance() public view returns (uint256) {
                                                                        return address(this).balance;
                                                                }
                                                        
                                                                function getContractBalanceRate() public view returns (uint256) {
                                                                        uint256 contractBalance = address(this).balance;
                                                                        uint256 contractBalancePercent = contractBalance.div(CONTRACT_BALANCE_STEP);
                                                                        return BASE_PERCENT.add(contractBalancePercent);
                                                                }
                                                        
                                                                function getUserPercentRate(address userAddress) public view returns (uint256) {
                                                                        User storage user = users[userAddress];
                                                        
                                                                        uint256 contractBalanceRate = getContractBalanceRate();
                                                                        if (isActive(userAddress)) {
                                                                                uint256 timeMultiplier = (now.sub(user.checkpoint)).div(TIME_STEP);
                                                                                return contractBalanceRate.add(timeMultiplier);
                                                                        } else {
                                                                                return contractBalanceRate;
                                                                        }
                                                                }
                                                        
                                                                function getUserDividends(address userAddress) public view returns (uint256) {
                                                                        User storage user = users[userAddress];
                                                        
                                                                        uint256 userPercentRate = getUserPercentRate(userAddress);
                                                        
                                                                        uint256 totalDividends;
                                                                        uint256 dividends;
                                                        
                                                                        for (uint256 i = 0; i < user.deposits.length; i++) {
                                                        
                                                                                if (user.deposits[i].withdrawn < user.deposits[i].amount.mul(2)) {
                                                        
                                                                                        if (user.deposits[i].start > user.checkpoint) {
                                                        
                                                                                                dividends = (user.deposits[i].amount.mul(userPercentRate).div(PERCENTS_DIVIDER))
                                                                                                        .mul(block.timestamp.sub(user.deposits[i].start))
                                                                                                        .div(TIME_STEP);
                                                        
                                                                                        } else {
                                                        
                                                                                                dividends = (user.deposits[i].amount.mul(userPercentRate).div(PERCENTS_DIVIDER))
                                                                                                        .mul(block.timestamp.sub(user.checkpoint))
                                                                                                        .div(TIME_STEP);
                                                        
                                                                                        }
                                                        
                                                                                        if (user.deposits[i].withdrawn.add(dividends) > user.deposits[i].amount.mul(2)) {
                                                                                                dividends = (user.deposits[i].amount.mul(2)).sub(user.deposits[i].withdrawn);
                                                                                        }
                                                        
                                                                                        totalDividends = totalDividends.add(dividends);
                                                        
                                                                                        /// no update of withdrawn because that is view function
                                                        
                                                                                }
                                                        
                                                                        }
                                                        
                                                                        return totalDividends;
                                                                }
                                                        
                                                                function getUserCheckpoint(address userAddress) public view returns(uint256) {
                                                                        return users[userAddress].checkpoint;
                                                                }
                                                        
                                                                function getUserReferrer(address userAddress) public view returns(address) {
                                                                        return users[userAddress].referrer;
                                                                }
                                                        
                                                                function getUserReferralBonus(address userAddress) public view returns(uint256) {
                                                                        return users[userAddress].bonus;
                                                                }
                                                        
                                                                function getUserAvailable(address userAddress) public view returns(uint256) {
                                                                        return getUserReferralBonus(userAddress).add(getUserDividends(userAddress));
                                                                }
                                                        
                                                                function isActive(address userAddress) public view returns (bool) {
                                                                        User storage user = users[userAddress];
                                                        
                                                                        if (user.deposits.length > 0) {
                                                                                if (user.deposits[user.deposits.length-1].withdrawn < user.deposits[user.deposits.length-1].amount.mul(2)) {
                                                                                        return true;
                                                                                }
                                                                        }
                                                                }
                                                        
                                                                function getUserDepositInfo(address userAddress, uint256 index) public view returns(uint256, uint256, uint256) {
                                                                        User storage user = users[userAddress];
                                                        
                                                                        return (user.deposits[index].amount, user.deposits[index].withdrawn, user.deposits[index].start);
                                                                }
                                                        
                                                                function getUserAmountOfDeposits(address userAddress) public view returns(uint256) {
                                                                        return users[userAddress].deposits.length;
                                                                }
                                                        
                                                                function getUserTotalDeposits(address userAddress) public view returns(uint256) {
                                                                        User storage user = users[userAddress];
                                                        
                                                                        uint256 amount;
                                                        
                                                                        for (uint256 i = 0; i < user.deposits.length; i++) {
                                                                                amount = amount.add(user.deposits[i].amount);
                                                                        }
                                                        
                                                                        return amount;
                                                                }
                                                        
                                                                function getUserTotalWithdrawn(address userAddress) public view returns(uint256) {
                                                                        User storage user = users[userAddress];
                                                        
                                                                        uint256 amount;
                                                        
                                                                        for (uint256 i = 0; i < user.deposits.length; i++) {
                                                                                amount = amount.add(user.deposits[i].withdrawn);
                                                                        }
                                                        
                                                                        return amount;
                                                                }
                                                        
                                                                function isContract(address addr) internal view returns (bool) {
                                                                        uint size;
                                                                        assembly { size := extcodesize(addr) }
                                                                        return size > 0;
                                                                }
                                                        
                                                        }
                                                        
                                                        library SafeMath {
                                                        
                                                                function add(uint256 a, uint256 b) internal pure returns (uint256) {
                                                                        uint256 c = a + b;
                                                                        require(c >= a, "SafeMath: addition overflow ");
                                                        
                                                                        return c;
                                                                }
                                                        
                                                                function sub(uint256 a, uint256 b) internal pure returns (uint256) {
                                                                        require(b <= a, "SafeMath: subtraction overflow "); uint256 c="a " - b; return c; } function mul(uint256 b) internal pure returns (uint256) { if (a="=" 0) 0; * require(c a="=" b, multiplication div(uint256 require(b> 0, " SafeMath: division
                                            by zero ");
                                                                        uint256 c = a / b;
                                                        
                                                                        return c;
                                                                }
                                                        }</=>
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