// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

/// @dev Partial implementation of Chainlink's `IVRFV2PlusWrapper` without option to fund requests with LINK tokens
interface IVRFV2PlusWrapper {
    /// @return the request ID of the most recent VRF V2 request made by this wrapper. This should only
    /// be relied on within the same transaction that the request was made.
    function lastRequestId() external view returns (uint256);

    /// @notice Calculates the price of a VRF request in native with the given callbackGasLimit at the current block.
    /// @dev This function relies on the transaction gas price which is not automatically set during
    /// simulation. To estimate the price at a specific gas price, use the estimatePrice function.
    /// @param _callbackGasLimit is the gas limit used to estimate the price.
    /// @param _numWords is the number of words to request.
    function calculateRequestPriceNative(uint32 _callbackGasLimit, uint32 _numWords) external view returns (uint256);

    /// @notice Estimates the price of a VRF request in native with a specific gas limit and gas price.
    /// @dev This is a convenience function that can be called in simulation to better understand pricing.
    /// @param _callbackGasLimit is the gas limit used to estimate the price.
    /// @param _numWords is the number of words to request.
    /// @param _requestGasPriceWei is the gas price in wei used for the estimation.
    function estimateRequestPriceNative(uint32 _callbackGasLimit, uint32 _numWords, uint256 _requestGasPriceWei)
        external
        view
        returns (uint256);

    /// @notice Requests randomness from the VRF V2 wrapper, paying in native token.
    /// @param _callbackGasLimit is the gas limit for the request.
    /// @param _requestConfirmations number of request confirmations to wait before serving a request.
    /// @param _numWords is the number of words to request.
    function requestRandomWordsInNative(
        uint32 _callbackGasLimit,
        uint16 _requestConfirmations,
        uint32 _numWords,
        bytes calldata extraArgs
    ) external payable returns (uint256 requestId);
}