// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.8.0;

interface IStakedTokenV2 {
  struct CooldownSnapshot {
    uint40 timestamp;
    uint216 amount;
  }

  event RewardsAccrued(address user, uint256 amount);
  event RewardsClaimed(
    address indexed from,
    address indexed to,
    uint256 amount
  );
  event Cooldown(address indexed user, uint256 amount);

  /**
   * @dev Allows staking a specified amount of STAKED_TOKEN
   * @param to The address to receiving the shares
   * @param amount The amount of assets to be staked
   */
  function stake(address to, uint256 amount) external;

  /**
   * @dev Redeems shares, and stop earning rewards
   * @param to Address to redeem to
   * @param amount Amount of shares to redeem
   */
  function redeem(address to, uint256 amount) external;

  /**
   * @dev Activates the cooldown period to unstake
   * - It can't be called if the user is not staking
   */
  function cooldown() external;

  /**
   * @dev Claims an `amount` of `REWARD_TOKEN` to the address `to`
   * @param to Address to send the claimed rewards
   * @param amount Amount to stake
   */
  function claimRewards(address to, uint256 amount) external;

  /**
   * @dev Return the total rewards pending to claim by an staker
   * @param staker The staker address
   * @return The rewards
   */
  function getTotalRewardsBalance(address staker)
    external
    view
    returns (uint256);

  /**
   * @dev implements the permit function as for https://github.com/ethereum/EIPs/blob/8a34d644aacf0f9f8f00815307fd7dd5da07655f/EIPS/eip-2612.md
   * @param owner the owner of the funds
   * @param spender the spender
   * @param value the amount
   * @param deadline the deadline timestamp, type(uint256).max for no deadline
   * @param v signature param
   * @param s signature param
   * @param r signature param
   */
  function permit(
    address owner,
    address spender,
    uint256 value,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external;

}