Dark Bundles (BUND) - Smart Contract Audit Report

Summary

Dark Bundles is a fork of Bundles Finance, which our firm previously audited. The platform intends to expand and improve upon the work of the Bundles team by providing a better selection of coins to predict, higher reward levels, shorter pool times, more liquidity on Uniswap, and a token transaction fee of 1%.
The platform allows users to predict which cryptocurrency assets will perform best over the defined period. Users stake their DBUND tokens on a single asset or bundle of assets they believe will perform best. Based upon the performance of the assets chosen in comparison to other users, the player will either increase or decrease their holdings of DBUND.

We audited Dark Bundles at the following addresses:

Audit Findings:

• The DBUND token contract is secure and cannot be minted after deployment. As opposed to BUND, DBUND does not contain a burn function.
• There is a 1% transaction fee on transfers of the token. The funds collected from this fee are sent to an address controlled by the development team. This address cannot be updated.


• Both pools allow users to pick an asset (or a series of assets) and stake their tokens to recieve returns or losses based on how those asset(s) perform over a 24-hour period.
• The high risk pool allows users to win/lose up to 50% as opposed to 10% on the low-risk pool. The team controls the system that determines winners; so calculate personal risk tolerance accordingly.


• The logic that manages the platform is run on an off-chain server. The owner-restricted functions of the contracts are called by this server using a privatekey stored on the server in order to determine prices and update user balances. If this key or its owner were compromised, user funds would be at risk.
• The prices fed to the Oracle contract are sent directly from the contract's owner via off chain logic and pricing data pulled from CoinGecko. Users must trust that the team will honestly utilize the real current prices.
• In order to mitigate this risk, limits on the amount that can be won/lost (50% in Degen pool and 10% in normal pool) have been hard coded in the contract.


• Usage of ReentrancyGuard in applicable functions to prevent re-entrancy attacks.
• Utilization of SafeMath to prevent overflows and ensure safe transfers. The tokens also properly follow the ERC20 standard.

Audit Summary:
• No issues from outside attackers were identified.
• Ensure trust in the project team. If the team acts maliciously the code restricts them from misappropriating more than 10% of user's staked tokens in the low-risk pool and 50% in the high-risk pool.
• Date: January 16th, 2021.

 ($) = payable function
 # = non-constant function
 
 Int = Internal
 Ext = External
 Pub = Public

 + [Int] IERC20 
    - [Ext] totalSupply
    - [Ext] balanceOf
    - [Ext] transfer #
    - [Ext] allowance
    - [Ext] approve #
    - [Ext] transferFrom #

 + [Lib] SafeMath 
    - [Int] add
    - [Int] sub
    - [Int] mul
    - [Int] div
    - [Int] mod

 +  ERC20 (IERC20)
    - [Pub] totalSupply
    - [Pub] balanceOf
    - [Pub] transfer #
    - [Pub] allowance
    - [Pub] approve #
    - [Pub] transferFrom #
    - [Pub] increaseAllowance #
    - [Pub] decreaseAllowance #
    - [Int] _transfer #
    - [Int] _mint #
    - [Int] _approve #

 +  DarkBundlesToken (ERC20)
    - [Pub]  ($)
    - [Pub] transfer #
    - [Pub] name
    - [Pub] symbol
    - [Pub] decimals

  
							

/**
 *Submitted for verification at Etherscan.io on 2020-12-28
*/

// SPDX-License-Identifier: UNLICENSED

// File: contracts\open-zeppelin-contracts\token\ERC20\IERC20.sol

pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see `ERC20Detailed`.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @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.
     *
     * > 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);
}

// File: contracts\open-zeppelin-contracts\math\SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

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

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}

// File: contracts\open-zeppelin-contracts\token\ERC20\ERC20.sol

pragma solidity ^0.5.0;
/**
 * @dev Implementation of the `IERC20` interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using `_mint`.
 * For a generic mechanism see `ERC20Mintable`.
 *
 * *For a detailed writeup see our guide [How to implement supply
 * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an `Approval` event is emitted on calls to `transferFrom`.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard `decreaseAllowance` and `increaseAllowance`
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See `IERC20.approve`.
 */
contract ERC20 is IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    /**
     * @dev See `IERC20.totalSupply`.
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See `IERC20.balanceOf`.
     */
    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See `IERC20.transfer`.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    /**
     * @dev See `IERC20.allowance`.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See `IERC20.approve`.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 value) public returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev See `IERC20.transferFrom`.
     *
     * Emits an `Approval` event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of `ERC20`;
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `value`.
     * - the caller must have allowance for `sender`'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to `approve` that can be used as a mitigation for
     * problems described in `IERC20.approve`.
     *
     * Emits an `Approval` event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to `approve` that can be used as a mitigation for
     * problems described in `IERC20.approve`.
     *
     * Emits an `Approval` event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to `transfer`, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a `Transfer` event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount);
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a `Transfer` event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an `Approval` event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

}

// File: contracts\ERC20\DarkBundleToken.sol

pragma solidity ^0.5.0;

/**
 * @title DarkBundleToken
 * @author DarkBundle Team
 *
 * @dev Standard ERC20 token with burning and optional functions implemented.
 * For full specification of ERC-20 standard see:
 * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
 */
contract DarkBundlesToken is ERC20 {

    string private _name                        = "Dark Bundles";
    string private _symbol                      = "DBund";
    uint8 private _decimals                     = 18;    
    uint256 private _totalSupply                = 1_000_000 * 10e17;    // 1 million 
    uint8 private _platform_fees                = 1;
    address payable private _platform_fees_receiver;

    /**
     * @dev Constructor.
     * @param feeReceiver address that receive fee
     * @param tokenOwnerAddress address that gets 100% of token supply
     */
    constructor(address payable feeReceiver, address payable tokenOwnerAddress) public payable {
     // 
     _platform_fees_receiver = feeReceiver;

      // set tokenOwnerAddress as owner of all tokens
      _mint(tokenOwnerAddress, _totalSupply);

      // pay the service fee for contract deployment
      feeReceiver.transfer(msg.value);
    }

    /**
     * @dev Transfer tokens.
     * @param recipient address of token receiver.
     * @param amount The amount of token to be transfered.
     */
    function transfer(address recipient, uint256 amount) public returns (bool) {
        
      uint256 fees = amount.mul(_platform_fees).div(100);
      uint256 amountAfterDeductingFees = amount.sub(fees);

      _transfer(msg.sender, recipient, amountAfterDeductingFees);
      _transfer(msg.sender, _platform_fees_receiver, fees);
      
      return true;
    }

    // optional functions from ERC20 stardard

    /**
     * @return the name of the token.
     */
    function name() public view returns (string memory) {
      return _name;
    }

    /**
     * @return the symbol of the token.
     */
    function symbol() public view returns (string memory) {
      return _symbol;
    }

    /**
     * @return the number of decimals of the token.
     */
    function decimals() public view returns (uint8) {
      return _decimals;
    }
}

 ($) = payable function
 # = non-constant function
 
 Int = Internal
 Ext = External
 Pub = Public
 
 +  ReentrancyGuard 
    - [Int]  #

 + [Int] IERC20 
    - [Ext] totalSupply
    - [Ext] balanceOf
    - [Ext] transfer #
    - [Ext] allowance
    - [Ext] approve #
    - [Ext] transferFrom #

 + [Lib] SafeMath 
    - [Int] add
    - [Int] sub
    - [Int] mul
    - [Int] div
    - [Int] mod

 +  ERC20 (IERC20)
    - [Pub] totalSupply
    - [Pub] balanceOf
    - [Pub] transfer #
    - [Pub] allowance
    - [Pub] approve #
    - [Pub] transferFrom #
    - [Pub] increaseAllowance #
    - [Pub] decreaseAllowance #
    - [Int] _transfer #
    - [Int] _mint #
    - [Int] _burn #
    - [Int] _approve #
    - [Int] _burnFrom #

 +  TokenMintERC20Token (ERC20)
    - [Pub]  ($)
    - [Pub] burn #
    - [Pub] name
    - [Pub] symbol
    - [Pub] decimals

 +  DarkBundles (ReentrancyGuard)
    - [Pub]  #
    - [Pub] PlaceBet #
    - [Pub] updatebal #
    - [Int] updateFee #
    - [Pub] createBundle #
    - [Pub] updateowner #
    - [Pub] updatetime #
    - [Pub] withdraw #
       - modifiers: nonReentrant
    - [Pub] fetchUser
    - [Pub] fetchBundle
    - [Pub] fetchUserBets
    - [Pub] fetchUserInBundle
    - [Pub] collectdeveloperfee #
       - modifiers: nonReentrant

							

/**
 *Submitted for verification at Etherscan.io on 2021-01-13
*/

/**
 *Submitted for verification at Etherscan.io on 2021-01-10
*/

/**
 *Submitted for verification at Etherscan.io on 2020-12-07
*/

// SPDX-License-Identifier: UNLICENSED

pragma solidity <=0.7.5;// File: contracts\open-zeppelin-contracts\token\ERC20\IERC20.sol

pragma solidity ^0.5.0;

contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see `ERC20Detailed`.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @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.
     *
     * > 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);
}

// File: contracts\open-zeppelin-contracts\math\SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

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

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}

// File: contracts\open-zeppelin-contracts\token\ERC20\ERC20.sol

pragma solidity ^0.5.0;
/**
 * @dev Implementation of the `IERC20` interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using `_mint`.
 * For a generic mechanism see `ERC20Mintable`.
 *
 * *For a detailed writeup see our guide [How to implement supply
 * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an `Approval` event is emitted on calls to `transferFrom`.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard `decreaseAllowance` and `increaseAllowance`
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See `IERC20.approve`.
 */
contract ERC20 is IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    /**
     * @dev See `IERC20.totalSupply`.
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See `IERC20.balanceOf`.
     */
    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See `IERC20.transfer`.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    /**
     * @dev See `IERC20.allowance`.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See `IERC20.approve`.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 value) public returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev See `IERC20.transferFrom`.
     *
     * Emits an `Approval` event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of `ERC20`;
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `value`.
     * - the caller must have allowance for `sender`'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to `approve` that can be used as a mitigation for
     * problems described in `IERC20.approve`.
     *
     * Emits an `Approval` event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to `approve` that can be used as a mitigation for
     * problems described in `IERC20.approve`.
     *
     * Emits an `Approval` event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to `transfer`, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a `Transfer` event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount);
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a `Transfer` event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

     /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a `Transfer` event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 value) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _totalSupply = _totalSupply.sub(value);
        _balances[account] = _balances[account].sub(value);
        emit Transfer(account, address(0), value);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an `Approval` event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    /**
     * @dev Destoys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See `_burn` and `_approve`.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));
    }
}

// File: contracts\ERC20\TokenMintERC20Token.sol

pragma solidity ^0.5.0;/**
 * @title TokenMintERC20Token
 * @author TokenMint (visit https://tokenmint.io)
 *
 * @dev Standard ERC20 token with burning and optional functions implemented.
 * For full specification of ERC-20 standard see:
 * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
 */
contract TokenMintERC20Token is ERC20 {

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Constructor.
     * @param name name of the token
     * @param symbol symbol of the token, 3-4 chars is recommended
     * @param decimals number of decimal places of one token unit, 18 is widely used
     * @param totalSupply total supply of tokens in lowest units (depending on decimals)
     * @param tokenOwnerAddress address that gets 100% of token supply
     */
    constructor(string memory name, string memory symbol, uint8 decimals, uint256 totalSupply, address payable feeReceiver, address tokenOwnerAddress) public payable {
      _name = name;
      _symbol = symbol;
      _decimals = decimals;

      // set tokenOwnerAddress as owner of all tokens
      _mint(tokenOwnerAddress, totalSupply);

      // pay the service fee for contract deployment
      feeReceiver.transfer(msg.value);
    }

    /**
     * @dev Burns a specific amount of tokens.
     * @param value The amount of lowest token units to be burned.
     */
    function burn(uint256 value) public {
      _burn(msg.sender, value);
    }

    // optional functions from ERC20 stardard

    /**
     * @return the name of the token.
     */
    function name() public view returns (string memory) {
      return _name;
    }

    /**
     * @return the symbol of the token.
     */
    function symbol() public view returns (string memory) {
      return _symbol;
    }

    /**
     * @return the number of decimals of the token.
     */
    function decimals() public view returns (uint8) {
      return _decimals;
    }
}

contract DarkBundles is ReentrancyGuard {
    
    uint256 public bundleId = 1;
    address public owner;
    
    /* Bundle Token Address */
    
    TokenMintERC20Token public bundle_address;
    
    /* Variable to store the fee collected */
    
    uint256 public fee_collected;       
    
    /* Last Created Informations*/
    
    uint256 public lastcreated;
    uint256 lastbundlecreated;

    struct UserBets{
        uint256 bundles;
        uint256 amounts;
        uint256 prices;
        bool betted;
        uint256 balance;
        uint256 totalbet;
        bool claimed;
        uint256 index;
    }
    
    struct User{
        uint256[] bundles;
        uint256 balance;
        uint256 freebal;
    }
    
    struct Data{
        address[] user;
    }
    
    struct Bundle{
        uint256[20] prices;
        uint256 startime;
        uint256 stakingends;
        uint256 endtime;
    }
    
    mapping(address => mapping(uint256 => UserBets)) bets;
    mapping(uint256 => Bundle) bundle;
    mapping(address => User) user;
    mapping(uint256 => Data) data;
    
    constructor(address _bundle_address) public{
        owner = msg.sender;
        bundle_address = TokenMintERC20Token(_bundle_address);
        lastcreated = block.timestamp;
    }
    
    /* For placing a prediction in the bundle. */
    
    function PlaceBet(uint256 index,uint256 _prices,uint256 _percent,uint256 _bundleId,uint256 _amount) public returns(bool){
        require(_bundleId <= bundleId,'Invalid Bundle');
        require(bundle_address.allowance(msg.sender,address(this))>=_amount,'Approval failed');
        Bundle storage b = bundle[_bundleId];
        Data storage d = data[_bundleId];
        require(b.stakingends >= block.timestamp,'Ended');
        User storage us = user[msg.sender];
        UserBets storage u = bets[msg.sender][_bundleId];
        require(u.bundles == 0,'Already Betted');
        if(u.betted == false){
            u.balance = bundle_address.balanceOf(msg.sender);
            u.betted = true;
        }
        else{
            require(SafeMath.add(u.totalbet,_amount) <= u.balance,'Threshold Reached');
        }
        us.bundles.push(_bundleId);
        us.balance = SafeMath.add(us.balance,_amount);
        u.bundles = _percent; 
        u.prices = _prices; 
        u.amounts = _amount;
        u.index = index;
        u.totalbet = u.totalbet + _amount;
        d.user.push(msg.sender);
        bundle_address.transferFrom(msg.sender,address(this),_amount);
        return true;
    }
    
    /* Update user balance. Max 10% can be changed */

    function updatebal(address _user,uint256 _bundleId,uint256 _reward,bool _isPositive) public returns(bool){
        require(msg.sender == owner,'Not Owner');
        require(_reward <= 10000000,'Invalid Reward Percent');
        User storage us = user[_user];
        UserBets storage u = bets[_user][_bundleId];
        require(u.claimed == false,'Already Claimed');
        if(_isPositive == true){
            updateFee(_reward,u.totalbet);
            uint256 temp = SafeMath.mul(_reward,90);
            uint256 reward = SafeMath.div(temp,100);
            uint256 a = SafeMath.mul(u.totalbet,reward);
            uint256 b = SafeMath.div(a,10**8);
            uint256 c = SafeMath.add(u.totalbet,b);
            u.claimed = true;
            us.freebal = SafeMath.add(c,us.freebal);
            us.balance = SafeMath.sub(us.balance,u.totalbet);
        }
        else{
            uint256 a = SafeMath.mul(u.totalbet,_reward);
            uint256 b = SafeMath.div(a,10**8);
            uint256 c = SafeMath.sub(u.totalbet,b);
            u.claimed = true;
            us.freebal = SafeMath.add(c,us.freebal);
            us.balance = SafeMath.sub(us.balance,u.totalbet);
        }
        return true;
    }
    
    /* Update the fee incurred */
    
    function updateFee(uint256 r,uint256 amt) internal{
        uint256 temp = SafeMath.mul(r,10);
        uint256 reward = SafeMath.div(temp,100);
        uint256 a = SafeMath.mul(amt,reward);
        uint256 b = SafeMath.div(a,10**8);
        fee_collected = SafeMath.add(fee_collected,b);
    }
    
    /* Create a new bundle after 1 days */
    
    function createBundle(uint256[20] memory _prices) public returns(bool){
        require(msg.sender == owner,'Not Owner');
        require( block.timestamp > lastbundlecreated +  1 days,'Cannot Create');
        Bundle storage b = bundle[bundleId];
        b.prices = _prices;
        b.startime = block.timestamp;
        lastbundlecreated = block.timestamp;
        lastcreated = block.timestamp;
        b.endtime = SafeMath.add(block.timestamp,1 days);
        b.stakingends = SafeMath.add(block.timestamp,12 hours);
        bundleId = SafeMath.add(bundleId,1);
        return true;
    }
    
    /* Update new owner of the contract */
    
    function updateowner(address new_owner) public returns(bool){
        require(msg.sender == owner,'Not an Owner');
        owner = new_owner;
        return true;
    }
    
    /* Update the timestamp of the last creted bundle. this function cannot change the bundle time. Last created variable is for display sake. */
    
    function updatetime(uint256 _timestamp) public returns(bool){
        require(msg.sender == owner,'Not an owner');
        lastcreated =  _timestamp;
    }
    
    /* Allows the user to withdraw his claimable balance from the contract */
    
    function withdraw() public nonReentrant returns(bool){
       User storage us = user[msg.sender];
       require(us.freebal > 0,'No bal');
       bundle_address.transfer(msg.sender,us.freebal);
       us.freebal = 0;
       return true;
    }
    
    /*  Fetch the information about user. His claimable balance, fixed balance & stuff */
     
    function fetchUser(address _user) public view returns(uint256[] memory _bundles,uint256 claimable,uint256 staked_balance){
        User storage us = user[_user];
        return(us.bundles,us.freebal,us.balance);
    }
    
    /* Fetch the information of a BundleId */
    
    function fetchBundle(uint256 _bundleId) public view returns(uint256[20] memory _prices,uint256 _start,uint256 _end,uint256 _staking_ends){
        Bundle storage b = bundle[_bundleId];
        return(b.prices,b.startime,b.endtime,b.stakingends);
    }
    
    /* Fetch the prediction information of each user in each bundle. Pass bundleId and User Address to get the strike price as well as the amount in 18 decimals */
    
    function fetchUserBets(address _user, uint256 _bundleId) public view returns(uint256 _bundles,uint256 _prices,uint256 _amounts,uint256 balance,uint256 totalbet,uint256 index){
        UserBets storage u = bets[_user][_bundleId];
        return (u.bundles,u.prices,u.amounts,u.balance,u.totalbet, u.index);
    }
    
    /* Fetch all the user wallet predicted in a bundleId. Pass bundleId and will return an array of betters */
    
    function fetchUserInBundle(uint256 _bundleId) public view returns(address[] memory _betters){
        Data storage d = data[_bundleId];
        return d.user;
    }
    
    /*  
        Only Allow the Developer to withdraw the developer fee
    */
    
    function collectdeveloperfee() public nonReentrant returns(bool){
        require(msg.sender == owner,'To Be Claimed By Developer');
        bundle_address.transfer(msg.sender,fee_collected);
        fee_collected = 0;
        return true;
    }
    
}

 ($) = payable function
 # = non-constant function
 
 Int = Internal
 Ext = External
 Pub = Public
 
 +  ReentrancyGuard 
    - [Int]  #

 + [Int] IERC20 
    - [Ext] totalSupply
    - [Ext] balanceOf
    - [Ext] transfer #
    - [Ext] allowance
    - [Ext] approve #
    - [Ext] transferFrom #

 + [Lib] SafeMath 
    - [Int] add
    - [Int] sub
    - [Int] mul
    - [Int] div
    - [Int] mod

 +  ERC20 (IERC20)
    - [Pub] totalSupply
    - [Pub] balanceOf
    - [Pub] transfer #
    - [Pub] allowance
    - [Pub] approve #
    - [Pub] transferFrom #
    - [Pub] increaseAllowance #
    - [Pub] decreaseAllowance #
    - [Int] _transfer #
    - [Int] _mint #
    - [Int] _burn #
    - [Int] _approve #
    - [Int] _burnFrom #

 +  TokenMintERC20Token (ERC20)
    - [Pub]  ($)
    - [Pub] transfer #
    - [Pub] name
    - [Pub] symbol
    - [Pub] decimals

 +  DeganDarkBundles (ReentrancyGuard)
    - [Pub]  #
    - [Pub] PlaceBet #
    - [Pub] updatebal #
    - [Int] updateFee #
    - [Pub] createBundle #
    - [Pub] updateowner #
    - [Pub] updatetime #
    - [Pub] withdraw #
       - modifiers: nonReentrant
    - [Pub] fetchUser
    - [Pub] fetchBundle
    - [Pub] fetchUserBets
    - [Pub] fetchUserInBundle
    - [Pub] collectdeveloperfee #
       - modifiers: nonReentrant

							

/**
 *Submitted for verification at Etherscan.io on 2021-01-13
*/

/**
 *Submitted for verification at Etherscan.io on 2021-01-10
*/

/**
 *Submitted for verification at Etherscan.io on 2020-12-07
*/

// SPDX-License-Identifier: UNLICENSED

pragma solidity <=0.7.5;// File: contracts\open-zeppelin-contracts\token\ERC20\IERC20.sol

pragma solidity ^0.5.0;

contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor () internal {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see `ERC20Detailed`.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @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.
     *
     * > 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);
}

// File: contracts\open-zeppelin-contracts\math\SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

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

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}

// File: contracts\open-zeppelin-contracts\token\ERC20\ERC20.sol

pragma solidity ^0.5.0;
/**
 * @dev Implementation of the `IERC20` interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using `_mint`.
 * For a generic mechanism see `ERC20Mintable`.
 *
 * *For a detailed writeup see our guide [How to implement supply
 * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an `Approval` event is emitted on calls to `transferFrom`.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard `decreaseAllowance` and `increaseAllowance`
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See `IERC20.approve`.
 */
contract ERC20 is IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    /**
     * @dev See `IERC20.totalSupply`.
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See `IERC20.balanceOf`.
     */
    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See `IERC20.transfer`.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    /**
     * @dev See `IERC20.allowance`.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See `IERC20.approve`.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 value) public returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev See `IERC20.transferFrom`.
     *
     * Emits an `Approval` event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of `ERC20`;
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `value`.
     * - the caller must have allowance for `sender`'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to `approve` that can be used as a mitigation for
     * problems described in `IERC20.approve`.
     *
     * Emits an `Approval` event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to `approve` that can be used as a mitigation for
     * problems described in `IERC20.approve`.
     *
     * Emits an `Approval` event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to `transfer`, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a `Transfer` event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount);
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a `Transfer` event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

     /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a `Transfer` event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 value) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _totalSupply = _totalSupply.sub(value);
        _balances[account] = _balances[account].sub(value);
        emit Transfer(account, address(0), value);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an `Approval` event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    /**
     * @dev Destoys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See `_burn` and `_approve`.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));
    }
}

// File: contracts\ERC20\TokenMintERC20Token.sol

pragma solidity ^0.5.0;/**
 * @title TokenMintERC20Token
 * @author TokenMint (visit https://tokenmint.io)
 *
 * @dev Standard ERC20 token with burning and optional functions implemented.
 * For full specification of ERC-20 standard see:
 * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
 */
contract TokenMintERC20Token is ERC20 {

    string private _name;
    string private _symbol;
    uint8 private _decimals;
    uint8 private _platform_fees = 1;
    address private _platform_fees_receiver;

    /**
     * @dev Constructor.
     * @param name name of the token
     * @param symbol symbol of the token, 3-4 chars is recommended
     * @param decimals number of decimal places of one token unit, 18 is widely used
     * @param totalSupply total supply of tokens in lowest units (depending on decimals)
     * @param tokenOwnerAddress address that gets 100% of token supply
     */
    constructor(string memory name, string memory symbol, uint8 decimals, uint256 totalSupply, address payable feeReceiver, address tokenOwnerAddress) public payable {
      _name = name;
      _symbol = symbol;
      _decimals = decimals;
     _platform_fees_receiver = feeReceiver;
      // set tokenOwnerAddress as owner of all tokens
      _mint(tokenOwnerAddress, totalSupply);

      // pay the service fee for contract deployment
      feeReceiver.transfer(msg.value);
    }

    /**
     * @dev Transfer tokens.
     * @param recipient address of token receiver.
     * @param amount The amount of token to be transfered.
     */
    function transfer(address recipient, uint256 amount) public returns (bool) {
        
      uint256 fees = amount.mul(_platform_fees).div(100);
      uint256 amountAfterDeductingFees = amount.sub(fees);

      _transfer(msg.sender, recipient, amountAfterDeductingFees);
      _transfer(msg.sender, _platform_fees_receiver, fees);
      
      return true;
    }

    // optional functions from ERC20 stardard

    /**
     * @return the name of the token.
     */
    function name() public view returns (string memory) {
      return _name;
    }

    /**
     * @return the symbol of the token.
     */
    function symbol() public view returns (string memory) {
      return _symbol;
    }

    /**
     * @return the number of decimals of the token.
     */
    function decimals() public view returns (uint8) {
      return _decimals;
    }
}

contract DeganDarkBundles is ReentrancyGuard {
    
    uint256 public bundleId = 1;
    address public owner;
    
    /* Bundle Token Address */
    
    TokenMintERC20Token public bundle_address;
    
    /* Variable to store the fee collected */
    
    uint256 public fee_collected;       
    
    /* Last Created Informations*/
    
    uint256 public lastcreated;
    uint256 lastbundlecreated;

    struct UserBets{
        uint256 bundles;
        uint256 amounts;
        uint256 prices;
        bool betted;
        uint256 balance;
        uint256 totalbet;
        bool claimed;
        uint256 index;
    }
    
    struct User{
        uint256[] bundles;
        //string username;
        uint256 balance;
        uint256 freebal;
        //bool active;
    }
    
    struct Data{
        address[] user;
    }
    
    struct Bundle{
        uint256[20] prices;
        uint256 startime;
        uint256 stakingends;
        uint256 endtime;
    }
    
    mapping(address => mapping(uint256 => UserBets)) bets;
    mapping(uint256 => Bundle) bundle;
    mapping(address => User) user;
    mapping(uint256 => Data) data;
    
    constructor(address _bundle_address) public{
        owner = msg.sender;
        bundle_address = TokenMintERC20Token(_bundle_address);
        lastcreated = block.timestamp;
    }
    
    /*  Registering the username to the contract */
    
    // function Register(string memory _username) public returns(bool){
    //     User storage us = user[msg.sender];
    //     // require(us.active == false,'Existing User');
    //     us.active = true;
    //     us.username = _username;
    //     return true;
    // }
    
    /* For placing a prediction in the bundle. */
    
    function PlaceBet(uint256 index,uint256 _prices,uint256 _percent,uint256 _bundleId,uint256 _amount) public returns(bool){
        require(_bundleId <= bundleId,'Invalid Bundle');
        require(bundle_address.allowance(msg.sender,address(this))>=_amount,'Approval failed');
        Bundle storage b = bundle[_bundleId];
        Data storage d = data[_bundleId];
        require(b.stakingends >= block.timestamp,'Ended');
        User storage us = user[msg.sender];
        //require(us.active == true,'Register to participate');
        UserBets storage u = bets[msg.sender][_bundleId];
        require(u.bundles == 0,'Already Betted');
        if(u.betted == false){
            u.balance = bundle_address.balanceOf(msg.sender);
            u.betted = true;
        }
        else{
            require(SafeMath.add(u.totalbet,_amount) <= u.balance,'Threshold Reached');
        }
        us.bundles.push(_bundleId);
        us.balance = SafeMath.add(us.balance,_amount);
        u.bundles = _percent; 
        u.prices = _prices; 
        u.amounts = _amount;
        u.index = index;
        u.totalbet = u.totalbet + _amount;
        d.user.push(msg.sender);
        bundle_address.transferFrom(msg.sender,address(this),_amount);
        return true;
    }
    
    /* Update user balance. Max 50% can be changed */
    function updatebal(address _user,uint256 _bundleId,uint256 _reward,bool _isPositive) public returns(bool){
        require(msg.sender == owner,'Not Owner');
        require(_reward <= 50000000,'Invalid Reward Percent');
        User storage us = user[_user];
        //require(us.active == true,'Invalid User');
        UserBets storage u = bets[_user][_bundleId];
        require(u.claimed == false,'Already Claimed');
        if(_isPositive == true){
            updateFee(_reward,u.totalbet);
            uint256 temp = SafeMath.mul(_reward,90);
            uint256 reward = SafeMath.div(temp,100);
            uint256 a = SafeMath.mul(u.totalbet,reward);
            uint256 b = SafeMath.div(a,10**8);
            uint256 c = SafeMath.add(u.totalbet,b);
            u.claimed = true;
            us.freebal = SafeMath.add(c,us.freebal);
            us.balance = SafeMath.sub(us.balance,u.totalbet);
        }
        else{
            uint256 a = SafeMath.mul(u.totalbet,_reward);
            uint256 b = SafeMath.div(a,10**8);
            uint256 c = SafeMath.sub(u.totalbet,b);
            u.claimed = true;
            us.freebal = SafeMath.add(c,us.freebal);
            us.balance = SafeMath.sub(us.balance,u.totalbet);
        }
        return true;
    }
    
    /* Update the fee incurred */
    
    function updateFee(uint256 r,uint256 amt) internal{
        uint256 temp = SafeMath.mul(r,10);
        uint256 reward = SafeMath.div(temp,100);
        uint256 a = SafeMath.mul(amt,reward);
        uint256 b = SafeMath.div(a,10**8);
        fee_collected = SafeMath.add(fee_collected,b);
    }
    
    /* Create a new bundle after 1 days */
    
    function createBundle(uint256[20] memory _prices) public returns(bool){
        require(msg.sender == owner,'Not Owner');
        require( block.timestamp > lastbundlecreated +  1 days,'Cannot Create');
        Bundle storage b = bundle[bundleId];
        b.prices = _prices;
        b.startime = block.timestamp;
        lastbundlecreated = block.timestamp;
        lastcreated = block.timestamp;
        b.endtime = SafeMath.add(block.timestamp,1 days);
        b.stakingends = SafeMath.add(block.timestamp,12 hours);
        bundleId = SafeMath.add(bundleId,1);
        return true;
    }
    
    /* Update new owner of the contract */
    
    function updateowner(address new_owner) public returns(bool){
        require(msg.sender == owner,'Not an Owner');
        owner = new_owner;
        return true;
    }
    
    /* Update the timestamp of the last creted bundle. this function cannot change the bundle time. Last created variable is for display sake. */
    
    function updatetime(uint256 _timestamp) public returns(bool){
        require(msg.sender == owner,'Not an owner');
        lastcreated =  _timestamp;
    }
    
    /* Allows the user to withdraw his claimable balance from the contract */
    
    function withdraw() public nonReentrant returns(bool){
       User storage us = user[msg.sender];
       //require(us.active == true,'Invalid User'); 
       require(us.freebal > 0,'No bal');
       bundle_address.transfer(msg.sender,us.freebal);
       us.freebal = 0;
       return true;
    }
    
    /*  Fetch the information about user. His claimable balance, fixed balance & stuff */
     
    function fetchUser(address _user) public view returns(uint256[] memory _bundles,uint256 claimable,uint256 staked_balance){
        User storage us = user[_user];
        return(us.bundles,us.freebal,us.balance);
    }
    
    /* Fetch the information of a BundleId */
    
    function fetchBundle(uint256 _bundleId) public view returns(uint256[20] memory _prices,uint256 _start,uint256 _end,uint256 _staking_ends){
        Bundle storage b = bundle[_bundleId];
        return(b.prices,b.startime,b.endtime,b.stakingends);
    }
    
    /* Fetch the prediction information of each user in each bundle. Pass bundleId and User Address to get the strike price as well as the amount in 18 decimals */
    
    function fetchUserBets(address _user, uint256 _bundleId) public view returns(uint256 _bundles,uint256 _prices,uint256 _amounts,uint256 balance,uint256 totalbet,uint256 index){
        UserBets storage u = bets[_user][_bundleId];
        return (u.bundles,u.prices,u.amounts,u.balance,u.totalbet,u.index);
    }
    
    /* Fetch all the user wallet predicted in a bundleId. Pass bundleId and will return an array of betters */
    
    function fetchUserInBundle(uint256 _bundleId) public view returns(address[] memory _betters){
        Data storage d = data[_bundleId];
        return d.user;
    }
    
    /*  
        Only Allow the Developer to withdraw the developer fee
    */
    
    function collectdeveloperfee() public nonReentrant returns(bool){
        require(msg.sender == owner,'To Be Claimed By Developer');
        bundle_address.transfer(msg.sender,fee_collected);
        fee_collected = 0;
        return true;
    }
    
}

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