// SPDX-License-Identifier: MIT
// OpenZeppelin Tron Contracts (last updated v5.5.0) (interfaces/ITRC3156FlashLender.sol)

pragma solidity >=0.5.0;

import {ITRC3156FlashBorrower} from "./ITRC3156FlashBorrower.sol";

/**
 * @dev Interface of the TRC-3156 FlashLender, as defined in
 * https://github.com/tronprotocol/tips/blob/master/tip-3156.md[TIP-3156] (the TRON-side analogue
 * of https://eips.ethereum.org/EIPS/eip-3156[EIP-3156]).
 */
interface ITRC3156FlashLender {
    /**
     * @dev The amount of currency available to be lent.
     * @param token The loan currency.
     * @return The amount of `token` that can be borrowed.
     */
    function maxFlashLoan(address token) external view returns (uint256);

    /**
     * @dev The fee to be charged for a given loan.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @return The amount of `token` to be charged for the loan, on top of the returned principal.
     */
    function flashFee(address token, uint256 amount) external view returns (uint256);

    /**
     * @dev Initiate a flash loan.
     * @param receiver The receiver of the tokens in the loan, and the receiver of the callback.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     */
    function flashLoan(
        ITRC3156FlashBorrower receiver,
        address token,
        uint256 amount,
        bytes calldata data
    ) external returns (bool);
}