interface IRewardPool {
  function rewardToken() external view returns (address);
  function lpToken() external view returns (address);
  function duration() external view returns (uint256);

  function periodFinish() external view returns (uint256);
  function rewardRate() external view returns (uint256);
  function rewardPerTokenStored() external view returns (uint256);

  function stake(uint256 amountWei) external;

  // `balanceOf` would give the amount staked. 
  // As this is 1 to 1, this is also the holder's share
  function balanceOf(address holder) external view returns (uint256);
  // total shares & total lpTokens staked
  function totalSupply() external view returns(uint256);

  function withdraw(uint256 amountWei) external;
  function exit() external;

  // get claimed rewards
  function earned(address holder) external view returns (uint256);

  // claim rewards
  function getReward() external;

  // notify
  function notifyRewardAmount(uint256 _amount) external;
}
// Unifying the interface with the Synthetix Reward Pool 
function totalSupply() external view returns(uint256);

// total shares & total lpTokens staked