IVault.sol

// Neptune Mutual Protocol (https://neptunemutual.com)
// SPDX-License-Identifier: BUSL-1.1
pragma solidity ^0.8.0;
import "./IMember.sol";
import "openzeppelin-solidity/contracts/token/ERC20/IERC20.sol";

interface IVault is IMember, IERC20 {
  struct VaultInfoType {
    uint256 totalPods;
    uint256 balance;
    uint256 extendedBalance;
    uint256 totalReassurance;
    uint256 myPodBalance;
    uint256 myShare;
    uint256 withdrawalOpen;
    uint256 withdrawalClose;
  }

  struct AddLiquidityArgs {
    /// @dev Enter the cover key
    bytes32 coverKey;
    /// @dev Enter the amount of liquidity token to supply.
    uint256 amount;
    /// @dev Enter the amount of NPM token to stake. Will be locked for a minimum window of one withdrawal period.
    uint256 npmStakeToAdd;
    /// @dev Enter referral code
    bytes32 referralCode;
  }

  event GovernanceTransfer(address indexed to, uint256 amount);
  event StrategyTransfer(address indexed token, address indexed strategy, bytes32 indexed name, uint256 amount);
  event StrategyReceipt(address indexed token, address indexed strategy, bytes32 indexed name, uint256 amount, uint256 income, uint256 loss);
  event PodsIssued(address indexed account, uint256 issued, uint256 liquidityAdded, bytes32 indexed referralCode);
  event PodsRedeemed(address indexed account, uint256 redeemed, uint256 liquidityReleased);
  event FlashLoanBorrowed(address indexed lender, address indexed borrower, address indexed stablecoin, uint256 amount, uint256 fee);
  event NpmStaken(address indexed account, uint256 amount);
  event NpmUnstaken(address indexed account, uint256 amount);
  event InterestAccrued(bytes32 indexed coverKey);
  event Entered(bytes32 indexed coverKey, address indexed account);
  event Exited(bytes32 indexed coverKey, address indexed account);

  function key() external view returns (bytes32);

  function sc() external view returns (address);

  /**
   * @dev Adds liquidity to the specified cover contract
   */
  function addLiquidity(AddLiquidityArgs calldata args) external;

  function accrueInterest() external;

  /**
   * @dev Removes liquidity from the specified cover contract
   * @param coverKey Enter the cover key
   * @param amount Enter the amount of liquidity token to remove.
   * @param npmStake Enter the amount of NPM stake to remove.
   * @param exit Indicates NPM stake exit.
   */
  function removeLiquidity(
    bytes32 coverKey,
    uint256 amount,
    uint256 npmStake,
    bool exit
  ) external;

  /**
   * @dev Transfers liquidity to governance contract.
   * @param coverKey Enter the cover key
   * @param to Enter the destination account
   * @param amount Enter the amount of liquidity token to transfer.
   */
  function transferGovernance(
    bytes32 coverKey,
    address to,
    uint256 amount
  ) external;

  /**
   * @dev Transfers liquidity to strategy contract.
   * @param coverKey Enter the cover key
   * @param strategyName Enter the strategy's name
   * @param amount Enter the amount of liquidity token to transfer.
   */
  function transferToStrategy(
    IERC20 token,
    bytes32 coverKey,
    bytes32 strategyName,
    uint256 amount
  ) external;

  /**
   * @dev Receives from strategy contract.
   * @param coverKey Enter the cover key
   * @param strategyName Enter the strategy's name
   * @param amount Enter the amount of liquidity token to transfer.
   */
  function receiveFromStrategy(
    IERC20 token,
    bytes32 coverKey,
    bytes32 strategyName,
    uint256 amount
  ) external;

  function calculatePods(uint256 forStablecoinUnits) external view returns (uint256);

  function calculateLiquidity(uint256 podsToBurn) external view returns (uint256);

  function getInfo(address forAccount) external view returns (VaultInfoType memory info);

  /**
   * @dev Returns the stablecoin balance of this vault
   * This also includes amounts lent out in lending strategies
   */
  function getStablecoinBalanceOf() external view returns (uint256);
}