// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.13;

import "@equilibria/root/number/types/UFixed18.sol";
import "@equilibria/root/number/types/Fixed18.sol";
import "@equilibria/root/token/types/Token18.sol";
import "./IController.sol";
import "./IProduct.sol";

interface ICollateral {
    event Deposit(address indexed user, IProduct indexed product, UFixed18 amount);
    event Withdrawal(address indexed user, IProduct indexed product, UFixed18 amount);
    event AccountSettle(IProduct indexed product, address indexed account, Fixed18 amount, UFixed18 newShortfall);
    event ProductSettle(IProduct indexed product, UFixed18 protocolFee, UFixed18 productFee);
    event Liquidation(address indexed user, IProduct indexed product, address liquidator, UFixed18 fee);
    event ShortfallResolution(IProduct indexed product, UFixed18 amount);
    event FeeClaim(address indexed account, UFixed18 amount);

    error CollateralCantLiquidate(UFixed18 totalMaintenance, UFixed18 totalCollateral);
    error CollateralInsufficientCollateralError();
    error CollateralUnderLimitError();
    error CollateralZeroAddressError();
    error CollateralAccountLiquidatingError(address account);

    function token() external view returns (Token18);
    function fees(address account) external view returns (UFixed18);
    function initialize(IController controller_) external;
    function depositTo(address account, IProduct product, UFixed18 amount) external;
    function withdrawTo(address receiver, IProduct product, UFixed18 amount) external;
    function withdrawFrom(address account, address receiver, IProduct product, UFixed18 amount) external;
    function liquidate(address account, IProduct product) external;
    function settleAccount(address account, Fixed18 amount) external;
    function settleProduct(UFixed18 amount) external;
    function collateral(address account, IProduct product) external view returns (UFixed18);
    function collateral(IProduct product) external view returns (UFixed18);
    function shortfall(IProduct product) external view returns (UFixed18);
    function liquidatable(address account, IProduct product) external view returns (bool);
    function liquidatableNext(address account, IProduct product) external view returns (bool);
    function resolveShortfall(IProduct product, UFixed18 amount) external;
    function claimFee() external;
}