BNB-Token.sol

/**

// SPDX-License-Identifier: MIT 
 
 /*   BFarm - investment platform based on Binance Smart Chain blockchain smart-contract technology. Safe and legit!
 *
 *    ______ 
 *    | ___ \      
 *    | |_/ /    BFarm.finance
 *    | ___ \    by AV
 *    | |_/ / 
 *    \____/
 *   ┌───────────────────────────────────────────────────────────────────────┐
 *   │   Website: https://bnbstake.app                                       │
 *   │                                                                       │
 *   │   Telegram Live Support: @bnbstake_support                            |
 *   │   Telegram Public Group: https://t.me/bnb_stake                       |
 *   |                                                                       |
 *   |   E-mail: admin@bnbstake.app                                          |
 *   └───────────────────────────────────────────────────────────────────────┘
 *
 *   [USAGE INSTRUCTION]
 *
 *   1) Connect browser extension Metamask (see help: https://academy.binance.com/en/articles/connecting-metamask-to-binance-smart-chain )
 *   2) Choose one of the tariff plans, enter the BUSD amount (10 BUSD minimum) using our website "Stake BUSD" button
 *   3) Wait for your earnings
 *   4) Withdraw earnings any time using our website "Withdraw" button
 *
 *   [INVESTMENT CONDITIONS]
 *
 *   - Basic interest rate: maximum +0.3% every 24 hours (~0.0125% hourly) - only for new deposits
 *   - Basic interest will be distributed to each plan according to its capitalization. If the plan has low cap, its daily interest will grow the most with a max of 0.3% daily.
 *   - Minimal deposit: 10 BUSD, no maximal limit
 *   - Total income: based on your tarrif plan (from 5% to 8% daily!!!) + Basic interest rate !!!
 *   - Earnings every moment, withdraw any time (if you use capitalization of interest you can withdraw only after end of your deposit) 
 *
 *   [AFFILIATE PROGRAM]
 *
 *   - 3-level referral commission: 5% - 2.5% - 0.5%
 *
 *   [FUNDS DISTRIBUTION]
 *
 *   - 82% Platform main balance, participants payouts
 *   - 8% Advertising and promotion expenses
 *   - 8% Affiliate program bonuses
 *   - 2% Support work, technical functioning, administration fee
 */

pragma solidity >=0.4.22 <0.9.0;

interface IBEP20 {
  /**
   * @dev Returns the amount of tokens in existence.
   */
  function totalSupply() external view returns (uint256);

  /**
   * @dev Returns the token decimals.
   */
  function decimals() external view returns (uint8);

  /**
   * @dev Returns the token symbol.
   */
  function symbol() external view returns (string memory);

  /**
  * @dev Returns the token name.
  */
  function name() external view returns (string memory);

  /**
   * @dev Returns the bep token owner.
   */
  function getOwner() external view returns (address);

  /**
   * @dev Returns the amount of tokens owned by `account`.
   */
  function balanceOf(address account) external view returns (uint256);

  /**
   * @dev Moves `amount` tokens from the caller's account to `recipient`.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transfer(address recipient, uint256 amount) external returns (bool);

  /**
   * @dev Returns the remaining number of tokens that `spender` will be
   * allowed to spend on behalf of `owner` through {transferFrom}. This is
   * zero by default.
   *
   * This value changes when {approve} or {transferFrom} are called.
   */
  function allowance(address _owner, address spender) external view returns (uint256);

  /**
   * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * IMPORTANT: Beware that changing an allowance with this method brings the risk
   * that someone may use both the old and the new allowance by unfortunate
   * transaction ordering. One possible solution to mitigate this race
   * condition is to first reduce the spender's allowance to 0 and set the
   * desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   *
   * Emits an {Approval} event.
   */
  function approve(address spender, uint256 amount) external returns (bool);

  /**
   * @dev Moves `amount` tokens from `sender` to `recipient` using the
   * allowance mechanism. `amount` is then deducted from the caller's
   * allowance.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

  /**
   * @dev Emitted when `value` tokens are moved from one account (`from`) to
   * another (`to`).
   *
   * Note that `value` may be zero.
   */
  event Transfer(address indexed from, address indexed to, uint256 value);

  /**
   * @dev Emitted when the allowance of a `spender` for an `owner` is set by
   * a call to {approve}. `value` is the new allowance.
   */
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract BNBStake {
	using SafeMath for uint256;

    IBEP20 public TOKENInstance;
	uint256 constant public INVEST_MIN_AMOUNT = 10 ether;
	uint256[] public REFERRAL_PERCENTS = [50, 25, 5];
	uint256 constant public PROJECT_FEE = 100;
	uint256 constant public PERCENT_STEP = 5;
	uint256 constant public PERCENTS_DIVIDER = 1000;
	uint256 constant public TIME_STEP = 1 days;

	uint256 public totalStaked;
	uint256 public totalRefBonus;

    struct Plan {
        uint256 time;
        uint256 percent;
    }

    Plan[] internal plans;

	struct Deposit {
        uint8 plan;
		uint256 percent;
		uint256 amount;
		uint256 profit;
		uint256 start;
		uint256 finish;
	}

	struct User {
		Deposit[] deposits;
		uint256 checkpoint;
		address referrer;
		uint256[3] levels;
		uint256 bonus;
		uint256 totalBonus;
	}

	mapping (address => User) internal users;

	uint256 public startUNIX;
	address payable public commissionWallet;

	event Newbie(address user);
	event NewDeposit(address indexed user, uint8 plan, uint256 percent, uint256 amount, uint256 profit, uint256 start, uint256 finish);
	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 wallet, uint256 startDate, address tokenAddress) {
		require(!isContract(wallet));
		require(startDate > 0);
		commissionWallet = wallet;
		startUNIX = startDate;
        TOKENInstance = IBEP20(tokenAddress);

        plans.push(Plan(14, 80));
        plans.push(Plan(21, 65));
        plans.push(Plan(28, 50));
        plans.push(Plan(14, 80));
        plans.push(Plan(21, 65));
        plans.push(Plan(28, 50));
	}

	function invest(address referrer, uint8 plan, uint256 value) public {
	    // msg.sender need to give allowance to this contract.
		require(value >= INVEST_MIN_AMOUNT, "Value less than required"); // require(msg.value >= INVEST_MIN_AMOUNT);
        require(plan < 6, "Invalid plan");

		uint256 fee = value.mul(PROJECT_FEE).div(PERCENTS_DIVIDER);
        TOKENInstance.transferFrom(msg.sender, commissionWallet, fee); // commissionWallet.transfer(fee);
        TOKENInstance.transferFrom(msg.sender, address(this), value.sub(fee)); //transfer tokens from sender to this contract
		emit FeePayed(msg.sender, fee);

		User storage user = users[msg.sender];

		if (user.referrer == address(0)) {
			if (users[referrer].deposits.length > 0 && referrer != msg.sender) {
				user.referrer = referrer;
			}

			address upline = user.referrer;
			for (uint256 i = 0; i < 3; i++) {
				if (upline != address(0)) {
					users[upline].levels[i] = users[upline].levels[i].add(1);
					upline = users[upline].referrer;
				} else break;
			}
		}

		if (user.referrer != address(0)) {

			address upline = user.referrer;
			for (uint256 i = 0; i < 3; i++) {
				if (upline != address(0)) {
					uint256 amount = value.mul(REFERRAL_PERCENTS[i]).div(PERCENTS_DIVIDER);
					users[upline].bonus = users[upline].bonus.add(amount);
					users[upline].totalBonus = users[upline].totalBonus.add(amount);
					emit RefBonus(upline, msg.sender, i, amount);
					upline = users[upline].referrer;
				} else break;
			}

		}

		if (user.deposits.length == 0) {
			user.checkpoint = block.timestamp;
			emit Newbie(msg.sender);
		}

		(uint256 percent, uint256 profit, uint256 finish) = getResult(plan, value);
		user.deposits.push(Deposit(plan, percent, value, profit, block.timestamp, finish));

		totalStaked = totalStaked.add(value);
		emit NewDeposit(msg.sender, plan, percent, value, profit, block.timestamp, finish);
	}

	function withdraw() public {
		User storage user = users[msg.sender];

		uint256 totalAmount = getUserDividends(msg.sender);

		uint256 referralBonus = getUserReferralBonus(msg.sender);
		if (referralBonus > 0) {
			user.bonus = 0;
			totalAmount = totalAmount.add(referralBonus);
		}

		require(totalAmount > 0, "User has no dividends");

		uint256 contractBalance = TOKENInstance.balanceOf(address(this));
		if (contractBalance < totalAmount) {
			totalAmount = contractBalance;
		}

		user.checkpoint = block.timestamp;

		TOKENInstance.transfer(msg.sender, totalAmount); //msg.sender.transfer(totalAmount);

		emit Withdrawn(msg.sender, totalAmount);

	}

	function getContractBalance() public view returns (uint256) {
		return address(this).balance;
	}

	function getPlanInfo(uint8 plan) public view returns(uint256 time, uint256 percent) {
		time = plans[plan].time;
		percent = plans[plan].percent;
	}

	function getPercent(uint8 plan) public view returns (uint256) {
		if (block.timestamp > startUNIX) {
			return plans[plan].percent.add(PERCENT_STEP.mul(block.timestamp.sub(startUNIX)).div(TIME_STEP));
		} else {
			return plans[plan].percent;
		}
    }

	function getResult(uint8 plan, uint256 deposit) public view returns (uint256 percent, uint256 profit, uint256 finish) {
		percent = getPercent(plan);

		if (plan < 3) {
			profit = deposit.mul(percent).div(PERCENTS_DIVIDER).mul(plans[plan].time);
		} else if (plan < 6) {
			for (uint256 i = 0; i < plans[plan].time; i++) {
				profit = profit.add((deposit.add(profit)).mul(percent).div(PERCENTS_DIVIDER));
			}
		}

		finish = block.timestamp.add(plans[plan].time.mul(TIME_STEP));
	}

	function getUserDividends(address userAddress) public view returns (uint256) {
		User storage user = users[userAddress];

		uint256 totalAmount;

		for (uint256 i = 0; i < user.deposits.length; i++) {
			if (user.checkpoint < user.deposits[i].finish) {
				if (user.deposits[i].plan < 3) {
					uint256 share = user.deposits[i].amount.mul(user.deposits[i].percent).div(PERCENTS_DIVIDER);
					uint256 from = user.deposits[i].start > user.checkpoint ? user.deposits[i].start : user.checkpoint;
					uint256 to = user.deposits[i].finish < block.timestamp ? user.deposits[i].finish : block.timestamp;
					if (from < to) {
						totalAmount = totalAmount.add(share.mul(to.sub(from)).div(TIME_STEP));
					}
				} else if (block.timestamp > user.deposits[i].finish) {
					totalAmount = totalAmount.add(user.deposits[i].profit);
				}
			}
		}

		return totalAmount;
	}

	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 getUserDownlineCount(address userAddress) public view returns(uint256, uint256, uint256) {
		return (users[userAddress].levels[0], users[userAddress].levels[1], users[userAddress].levels[2]);
	}

	function getUserReferralBonus(address userAddress) public view returns(uint256) {
		return users[userAddress].bonus;
	}

	function getUserReferralTotalBonus(address userAddress) public view returns(uint256) {
		return users[userAddress].totalBonus;
	}

	function getUserReferralWithdrawn(address userAddress) public view returns(uint256) {
		return users[userAddress].totalBonus.sub(users[userAddress].bonus);
	}

	function getUserAvailable(address userAddress) public view returns(uint256) {
		return getUserReferralBonus(userAddress).add(getUserDividends(userAddress));
	}

	function getUserAmountOfDeposits(address userAddress) public view returns(uint256) {
		return users[userAddress].deposits.length;
	}

	function getUserTotalDeposits(address userAddress) public view returns(uint256 amount) {
		for (uint256 i = 0; i < users[userAddress].deposits.length; i++) {
			amount = amount.add(users[userAddress].deposits[i].amount);
		}
	}

	function getUserDepositInfo(address userAddress, uint256 index) public view returns(uint8 plan, uint256 percent, uint256 amount, uint256 profit, uint256 start, uint256 finish) {
	    User storage user = users[userAddress];

		plan = user.deposits[index].plan;
		percent = user.deposits[index].percent;
		amount = user.deposits[index].amount;
		profit = user.deposits[index].profit;
		start = user.deposits[index].start;
		finish = user.deposits[index].finish;
	}

	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 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;

        return c;
    }
}