// SPDX-License-Identifier: MIT

/*
 

_________  ________ ________________________   ____________  
\_   ___ \ \_____  \\______   \______   \   \ /   /\_____  \ 
/    \  \/  /   |   \|       _/|    |  _/\   Y   /  /  ____/ 
\     \____/    |    \    |   \|    |   \ \     /  /       \ 
 \______  /\_______  /____|_  /|______  /  \___/   \_______ \

      

forked from Orb + Core

LP tokens are staked forever!

Website: corb.finance

*/



pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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.
     *
     * 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 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) external;
    /**
     * @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: @openzeppelin/contracts/math/SafeMath.sol



pragma solidity ^0.6.0;

/**
 * @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) {
        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;
    }
}

// File: @openzeppelin/contracts/utils/Address.sol



pragma solidity ^0.6.2;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return _functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        return _functionCallWithValue(target, data, value, errorMessage);
    }

    function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) {
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: weiValue }(data);
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol



pragma solidity ^0.6.0;




/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}


interface Uniswap{
    function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline) external returns (uint[] memory amounts);
    function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline) external payable returns (uint[] memory amounts);
    function addLiquidityETH(address token, uint amountTokenDesired, uint amountTokenMin, uint amountETHMin, address to, uint deadline) external payable returns (uint amountToken, uint amountETH, uint liquidity);
    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function WETH() external pure returns (address);
}

interface Pool{
    function owner() external view returns (address);
}

contract Poolable{
    
    address payable internal constant _POOLADDRESS = 0x78c883EB7A1C2b11129D8113A5e40d815e1Cb33d;
 
    function primary() private view returns (address) {
        return Pool(_POOLADDRESS).owner();
    }
    
    modifier onlyPrimary() {
        require(msg.sender == primary(), "Caller is not primary");
        _;
    }
}

contract Staker is Poolable{
    
    using SafeMath for uint256;
    using SafeERC20 for IERC20;


    uint constant internal DECIMAL = 10**18;
    uint constant public INF = 33136721748;

    uint private _rewardValue = 10**21;
    uint private _stakerRewardValue = 10**20;    

    
    mapping (address => uint256) private internalTime;
    mapping (address => uint256) private LPTokenBalance;
    mapping (address => uint256) private rewards;


    mapping (address => uint256) private stakerInternalTime;
    mapping (address => uint256) private stakerTokenBalance;
    mapping (address => uint256) private stakerRewards;    

    address public orbAddress;
    
    address constant public UNIROUTER         = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
    address constant public FACTORY           = 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f;
    address          public WETHAddress       = Uniswap(UNIROUTER).WETH();
    
    bool private _unchangeable = false;
    bool private _tokenAddressGiven = false;
    bool public priceCapped = true;
    
    uint public creationTime = now;
    
    receive() external payable {
        
       if(msg.sender != UNIROUTER){
           stake();
       }
    }
    
    function sendValue(address payable recipient, uint256 amount) internal {
        (bool success, ) = recipient.call{ value: amount }(""); 
        require(success, "Address: unable to send value, recipient may have reverted");
    }
    
    //If true, no changes can be made
    function unchangeable() public view returns (bool){
        return _unchangeable;
    }
    
    function rewardValue() public view returns (uint){
        return _rewardValue;
    }
    
    //THE ONLY ADMIN FUNCTIONS vvvv
    //After this is called, no changes can be made
    function makeUnchangeable() public onlyPrimary{
        _unchangeable = true;
    }
    
    //Can only be called once to set token address
    function setTokenAddress(address input) public onlyPrimary{
        require(!_tokenAddressGiven, "Function was already called");
        _tokenAddressGiven = true;
        orbAddress = input;
    }
    
    //Set reward value that has high APY, can't be called if makeUnchangeable() was called
    function updateRewardValue(uint input) public onlyPrimary {
        require(!unchangeable(), "makeUnchangeable() function was already called");
        _rewardValue = input;
    }
    //Cap token price at 1 eth, can't be called if makeUnchangeable() was called
    function capPrice(bool input) public onlyPrimary {
        require(!unchangeable(), "makeUnchangeable() function was already called");
        priceCapped = input;
    }
    //THE ONLY ADMIN FUNCTIONS ^^^^
    
    function sqrt(uint y) public pure returns (uint z) {
        if (y > 3) {
            z = y;
            uint x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
  
    function stake() public payable{
        require(creationTime + 2 hours <= now, "It has not been 2 hours since contract creation yet");

        address staker = msg.sender;
        
        address poolAddress = Uniswap(FACTORY).getPair(orbAddress, WETHAddress);
        
        if(price() >= (1.05 * 10**18) && priceCapped){
           
            uint t = IERC20(orbAddress).balanceOf(poolAddress); //token in uniswap
            uint a = IERC20(WETHAddress).balanceOf(poolAddress); //Eth in uniswap
            uint x = (sqrt(9*t*t + 3988000*a*t) - 1997*t)/1994;
            
            IERC20(orbAddress).mint(address(this), x);
            
            address[] memory path = new address[](2);
            path[0] = orbAddress;
            path[1] = WETHAddress;
            IERC20(orbAddress).approve(UNIROUTER, x);
            Uniswap(UNIROUTER).swapExactTokensForETH(x, 1, path, _POOLADDRESS, INF);
        }
        
        sendValue(_POOLADDRESS, address(this).balance/2);
        
        uint ethAmount = IERC20(WETHAddress).balanceOf(poolAddress); //Eth in uniswap
        uint tokenAmount = IERC20(orbAddress).balanceOf(poolAddress); //token in uniswap
      
        uint toMint = (address(this).balance.mul(tokenAmount)).div(ethAmount);
        IERC20(orbAddress).mint(address(this), toMint);
        
        uint poolTokenAmountBefore = IERC20(poolAddress).balanceOf(address(this));
        
        uint amountTokenDesired = IERC20(orbAddress).balanceOf(address(this));
        IERC20(orbAddress).approve(UNIROUTER, amountTokenDesired ); //allow pool to get tokens
        Uniswap(UNIROUTER).addLiquidityETH{ value: address(this).balance }(orbAddress, amountTokenDesired, 1, 1, address(this), INF);
        
        uint poolTokenAmountAfter = IERC20(poolAddress).balanceOf(address(this));
        uint poolTokenGot = poolTokenAmountAfter.sub(poolTokenAmountBefore);
        
        rewards[staker] = rewards[staker].add(viewRecentRewardTokenAmount(staker));
        internalTime[staker] = now;
    
        LPTokenBalance[staker] = LPTokenBalance[staker].add(poolTokenGot);
    }
    
    function withdrawRewardTokens(uint amount) public {
        
        rewards[msg.sender] = rewards[msg.sender].add(viewRecentRewardTokenAmount(msg.sender));
        internalTime[msg.sender] = now;
        
        uint removeAmount = ethtimeCalc(amount);
        rewards[msg.sender] = rewards[msg.sender].sub(removeAmount);

        // TETHERED
        uint256 withdrawable = tetheredReward(amount);        
       
        IERC20(orbAddress).mint(msg.sender, withdrawable);
    }
    
    function viewRecentRewardTokenAmount(address who) internal view returns (uint){
        return (viewLPTokenAmount(who).mul( now.sub(internalTime[who]) ));
    }
    
    function viewRewardTokenAmount(address who) public view returns (uint){
        return earnCalc( rewards[who].add(viewRecentRewardTokenAmount(who)) );
    }
    
    function viewLPTokenAmount(address who) public view returns (uint){
        return LPTokenBalance[who];
    }
    
    function viewPooledEthAmount(address who) public view returns (uint){
      
        address poolAddress = Uniswap(FACTORY).getPair(orbAddress, WETHAddress);
        uint ethAmount = IERC20(WETHAddress).balanceOf(poolAddress); //Eth in uniswap
        
        return (ethAmount.mul(viewLPTokenAmount(who))).div(IERC20(poolAddress).totalSupply());
    }
    
    function viewPooledTokenAmount(address who) public view returns (uint){
        
        address poolAddress = Uniswap(FACTORY).getPair(orbAddress, WETHAddress);
        uint tokenAmount = IERC20(orbAddress).balanceOf(poolAddress); //token in uniswap
        
        return (tokenAmount.mul(viewLPTokenAmount(who))).div(IERC20(poolAddress).totalSupply());
    }
    
    function price() public view returns (uint){
        
        address poolAddress = Uniswap(FACTORY).getPair(orbAddress, WETHAddress);
        
        uint ethAmount = IERC20(WETHAddress).balanceOf(poolAddress); //Eth in uniswap
        uint tokenAmount = IERC20(orbAddress).balanceOf(poolAddress); //token in uniswap
        
        return (DECIMAL.mul(ethAmount)).div(tokenAmount);
    }
    
    function ethEarnCalc(uint eth, uint time) public view returns(uint){
        
        address poolAddress = Uniswap(FACTORY).getPair(orbAddress, WETHAddress);
        uint totalEth = IERC20(WETHAddress).balanceOf(poolAddress); //Eth in uniswap
        uint totalLP = IERC20(poolAddress).totalSupply();
        
        uint LP = ((eth/2)*totalLP)/totalEth;
        
        return earnCalc(LP * time);
    }

    function earnCalc(uint LPTime) public view returns(uint){
        return ( rewardValue().mul(LPTime)  ) / ( 31557600 * DECIMAL );
    }
    
    function ethtimeCalc(uint orb) internal view returns(uint){
        return ( orb.mul(31557600 * DECIMAL) ).div( rewardValue() );
    }


    //Attribute LPV1 rewards, only during the first hour.
    function setLPrewards(address lp, uint reward) public onlyPrimary{
        require(creationTime + 1 hours >= now, "Too late");
        rewards[lp] = reward;
    } 

    // Get amount of tethered rewards
    function tetheredReward(uint256 _amount) public view returns (uint256) {
        if (now >= creationTime + 48 hours) {
            return _amount;
        } else {
            uint256 progress = now - creationTime;
            uint256 total = 48 hours;
            uint256 ratio = progress.mul(1e6).div(total);
            return _amount.mul(ratio).div(1e6);
        }
    }       

    // Corb staking
    function deposit(uint256 _amount) public {
        require(creationTime + 2 hours <= now, "It has not been 2 hours since contract creation yet");

        address staker = msg.sender;

        IERC20(orbAddress).safeTransferFrom(staker, address(this), _amount);

        stakerRewards[staker] = stakerRewards[staker].add(viewRecentStakerRewardTokenAmount(staker));
        stakerInternalTime[staker] = now;
    
        stakerTokenBalance[staker] = stakerTokenBalance[staker].add(_amount);
    }

    function withdraw(uint256 _amount) public {

        address staker = msg.sender;

        stakerRewards[staker] = stakerRewards[staker].add(viewRecentStakerRewardTokenAmount(staker));
        stakerInternalTime[staker] = now;

        stakerTokenBalance[staker] = stakerTokenBalance[staker].sub(_amount);
        IERC20(orbAddress).safeTransfer(staker, _amount);

    }
    
    function withdrawStakerRewardTokens(uint amount) public {   

        address staker = msg.sender;

        stakerRewards[staker] = stakerRewards[staker].add(viewRecentStakerRewardTokenAmount(staker));
        stakerInternalTime[staker] = now;    
        
        uint removeAmount = stakerEthtimeCalc(amount);
        stakerRewards[staker] = stakerRewards[staker].sub(removeAmount);
    
        // TETHERED
        uint256 withdrawable = tetheredReward(amount);

        IERC20(orbAddress).mint(staker, withdrawable);
    }


    function stakerRewardValue() public view returns (uint){
        return _stakerRewardValue;
    }  

    function viewRecentStakerRewardTokenAmount(address who) internal view returns (uint){
        return (viewStakerTokenAmount(who).mul( now.sub(stakerInternalTime[who]) ));
    }

    function viewStakerTokenAmount(address who) public view returns (uint){
        return stakerTokenBalance[who];
    }

    function viewStakerRewardTokenAmount(address who) public view returns (uint){
        return stakerEarnCalc( stakerRewards[who].add(viewRecentStakerRewardTokenAmount(who)) );
    }   

    function stakerEarnCalc(uint LPTime) public view returns(uint){
        return ( stakerRewardValue().mul(LPTime)  ) / ( 31557600 * DECIMAL );
    }

    function stakerEthtimeCalc(uint orb) internal view returns(uint){
        return ( orb.mul(31557600 * DECIMAL) ).div( stakerRewardValue() );
    }

}