// Contract: StakedPepeToken
// Target function: function _sell(address seller, uint256 tokenAmount, address recipient) internal returns (uint256)
an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    address private _previousOwner;
    bool private _paused;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );
    event RunStatusUpdated(bool indexed paused);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        address msgSender = _msgSender();
        _owner = msgSender;
        _paused = false;
        emit RunStatusUpdated(_paused);
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Returns if paused status
     */
    function isPaused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Throws if called when contract is paused
     */
    modifier isRunning() {
        require(
            _paused == false,
            "Function unavailable because contract is paused"
        );
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        require(!_paused, "Ownable: contract is paused");
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }

    /**
     * @dev Pause the contract for functions that check run status
     * Can only be called by the current owner.
     */
    function updateRunStatus(bool paused) public virtual onlyOwner {
        emit RunStatusUpdated(paused);
        _paused = paused;
    }

}

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
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) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        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-contracts/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) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        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) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

interface IERC20 {

    function totalSupply() external view returns (uint256);
    
    function symbol() external view returns(string memory);
    
    function name() external view returns(string memory);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);
    
    /**
     * @dev Returns the number of decimal places
     */
    function decimals() external view returns (uint8);

    /**
     * @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 StakedPepeToken is IERC20, Ownable {

    using SafeMath for uint256;

    // token data
    string private constant _name = "Staked Pepe";
    string private constant _symbol = "stPEPE";
    uint8 private constant _decimals = 18;
    uint256 private constant precision = 10**18;

    uint256  private _total_users; //counts new minters
    uint256  private _total_txs;
    
    IERC20 public immutable underlying;

    uint256 private _totalSupply;

    // balances
    mapping (address => uint256) private _balances;
    mapping (address => uint8) private _users;
    mapping (address => mapping (address => uint256)) private _allowances;

    
    // 5% buy and sell Fees
    uint256 public mintFee        = 95000;            
    uint256 public sellFee        = 95000;            
    uint256 private constant feeDenominator = 10**5;

    constructor() Ownable() {

        // initialize underlying asset; PEPE
        underlying = IERC20( address(0x6982508145454Ce325dDbE47a25d4ec3d2311933) );

    }

    /** Returns the total number of tokens in existence */
    function totalSupply() external view override returns (uint256) { 
        return _totalSupply; 
    }

    /** Returns the number of tokens owned by `account` */
    function balanceOf(address account) public view override returns (uint256) { 
        return _balances[account]; 
    }

    /** Returns the number of tokens `spender` can transfer from `holder` */
    function allowance(address holder, address spender) external view override returns (uint256) { 
        return _allowances[holder][spender]; 
    }
    
    /** Token Name */
    function name() public pure override returns (string memory) {
        return _name;
    }

    /** Token Ticker Symbol */
    function symbol() public pure override returns (string memory) {
        return _symbol;
    }

    /** Tokens decimals */
    function decimals() public pure override returns (uint8) {
        return _decimals;
    }

    /** Approves `spender` to transfer `amount` tokens from caller */
    function approve(address spender, uint256 amount) public override returns (bool) {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }
  
    /** Transfer Function */
    function transfer(address recipient, uint256 amount) external override nonReentrant returns (bool) {
        return _transferFrom(msg.sender, recipient, amount);
    }

    /** Transfer Function */
    function transferFrom(address sender, address recipient, uint256 amount) external override nonReentrant returns (bool) {
        _allowances[sender][msg.sender] = _allowances[sender][msg.sender].sub(amount, 'Insufficient Allowance');
        return _transferFrom(sender, recipient, amount);
    }
    
    /** Internal Transfer */
    function _transferFrom(address sender, address recipient, uint256 amount) internal returns (bool) {
        // make standard checks
        require(recipient != address(0) && sender != address(0), "Transfer To Zero");
        require(amount > 0, "Transfer Amt Zero");
        // track price change
        uint256 oldPrice = _calculatePrice();
        
        // subtract from sender
        _balances[sender] = _balances[sender].sub(amount, "Insufficient Balance");

        // give reduced amount to receiver
        _balances[recipient] = _balances[recipient].add(amount);

        
        // require price rises
        _requirePriceRises(oldPrice);

        //update globals
        _total_txs += 1;

        // Transfer Event
        emit Transfer(sender, recipient, amount);
        return true;
    }

    /** 
        Mint stPEPE tokens for sender by depositing PEPE into the contract
            Requirements:
                Approval from the PEPE prior to purchase
        
        @param numTokens number of PEPE tokens to mint stPEPE with
        @return tokensMinted number of stPEPE tokens minted
    */
    function mint(uint256 numTokens) external nonReentrant returns (uint256) {
        _checkGarbageCollector(address(this));
        return _mintWithBacking(numTokens, msg.sender);
    }

    /** 
        Mint stPEPE tokens for `recipient` by depositing PEPE into the contract
            Requirements:
                Approval from the PEPE prior to purchase
        
        @param numTokens number of PEPE tokens to mint stPEPE with
        @param recipient Account to receive minted stPEPE tokens
        @return tokensMinted number of stPEPE tokens minted
    */
    function mintTo(uint256 numTokens, address recipient) external nonReentrant returns (uint256) {
        _checkGarbageCollector(address(this));
        return _mintWithBacking(numTokens, recipient);
    }

    /** 
        Burns sender's stPEPE tokens and redeems their value in PEPE
        @param tokenAmount number of stPEPE tokens to redeem, must be greater than 0
    */
    function redeem(uint256 tokenAmount) external nonReentrant returns (uint256) {
        return _sell(msg.sender, tokenAmount, msg.sender);
    }
    
    /** 
        Burns sender's stPEPE tokens and redeems their value in PEPE for `recipient`
        @param tokenAmount number of stPEPE tokens to redeem, must be greater than 0
        @param recipient Recipient of PEPE transfer, must not be address(0)
    */
    function reedemTo(uint256 tokenAmount, address recipient) external nonReentrant returns (uint256) {
        return _sell(msg.sender, tokenAmount, recipient);
    }
    
    /** 
        Allows a user to remove their holdings from the supply 
        DOES NOT REDEEM UNDERLYING ASSET FOR USER
        @param amount number of stPEPE tokens to burn
    */
    function burn(uint256 amount) external nonReentrant {
        // get balance of caller
        uint256 bal = _balances[msg.sender];
        require(bal >= amount && bal > 0, 'Zero Holdings');
        // Track Change In Price
        uint256 oldPrice = _calculatePrice();
       
        // burn tokens from sender + supply
        _burn(msg.sender, amount);
        // require price rises
        _requirePriceRises(oldPrice);
        // Emit Call
        emit Burned(msg.sender, amount);
    }
    
    /** Stake tokens and deposits stPEPE in sender's address; must have prior approval for PEPE */
    function _mintWithBacking(uint256 amount, address recipient) internal returns (uint256) {
        
        // users token balance
        uint256 userTokenBalance = underlying.balanceOf(msg.sender);
        // ensure user has enough to send
        require(userTokenBalance > 0 && amount <= userTokenBalance, 'Insufficient Balance');

        // calculate price change
        uint256 oldPrice = _calculatePrice();

        // amount of underlying
        uint256 amountUnderlying = underlyingBalance();

        // transfer in token
        uint256 received = _transferIn(amount);

        // Handle Minting
        return _mintTo(recipient, received, amountUnderlying, oldPrice);
    }