// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.22;

/**
 * @title IERC3156FlashBorrower - Ex AAVE FlashLoanReceiver
 * @author Astrolab DAO
 * @notice Defines the basic interface of a flashloan-receiver contract
 * @dev Implement this interface to develop a flashloan-compatible flashLoanReceiver contract
 */
interface IERC3156FlashBorrower {
    // /**
    //  * @notice Deprecated flash loan (AAVE compatible)
    //  * @dev Executes an operation after receiving the borrowed assets
    //  * @dev Ensure that the contract can return the debt + premium, e.g., has
    //  *      enough funds to repay and has approved the Pool to pull the total amount
    //  * @param asset Address of the borrowed asset (typically the lending vault's underlying asset)
    //  * @param amount Amount of the borrowed asset
    //  * @param fee Fee charged for the flash loan
    //  * @param initiator Account initiating the flash loan
    //  * @param params Parameters for the function call
    //  * @return Boolean indicating the success of the operation
    //  */
    // function executeOperation(
    //   address asset,
    //   uint256 amount,
    //   uint256 fee,
    //   address initiator,
    //   bytes calldata params
    // ) external returns (bool);

    /**
     * @notice ERC-3156 compliant flash loan
     * @dev Executes an operation after receiving the borrowed assets
     * @param initiator Account initiating the flash loan
     * @param token Address of the borrowed asset (typically the lending vault's underlying asset)
     * @param amount Amount of tokens being borrowed
     * @param fee Fee charged for the flash loan
     * @param params Parameters for the function call
     * @return The operation signature (keccak256("ERC3156FlashBorrower.onFlashLoan"))
     */
    function onFlashLoan(address initiator, address token, uint256 amount, uint256 fee, bytes calldata params)
        external
        returns (bytes32);
}