// SPDX-License-Identifier: Apache-2.0
pragma solidity ^0.8.0;

import "./PythStructs.sol";
import "./IPythEvents.sol";

/// @title Consume prices from the Pyth Network (https://pyth.network/).
/// @dev Please refer to the guidance at https://docs.pyth.network/documentation/pythnet-price-feeds/best-practices for how to consume prices safely.
/// @author Pyth Data Association
interface IPyth is IPythEvents {
    /// @notice Returns the period (in seconds) that a price feed is considered valid since its publish time
    function getValidTimePeriod() external view returns (uint validTimePeriod);

    /// @notice Returns the price and confidence interval.
    /// @dev Reverts if the price has not been updated within the last `getValidTimePeriod()` seconds.
    /// @param id The Pyth Price Feed ID of which to fetch the price and confidence interval.
    /// @return price - please read the documentation of PythStructs.Price to understand how to use this safely.
    function getPrice(
        bytes32 id
    ) external view returns (PythStructs.Price memory price);

    /// @notice Returns the exponentially-weighted moving average price and confidence interval.
    /// @dev Reverts if the EMA price is not available.
    /// @param id The Pyth Price Feed ID of which to fetch the EMA price and confidence interval.
    /// @return price - please read the documentation of PythStructs.Price to understand how to use this safely.
    function getEmaPrice(
        bytes32 id
    ) external view returns (PythStructs.Price memory price);

    /// @notice Returns the price of a price feed without any sanity checks.
    /// @dev This function returns the most recent price update in this contract without any recency checks.
    /// This function is unsafe as the returned price update may be arbitrarily far in the past.
    ///
    /// Users of this function should check the `publishTime` in the price to ensure that the returned price is
    /// sufficiently recent for their application. If you are considering using this function, it may be
    /// safer / easier to use either `getPrice` or `getPriceNoOlderThan`.
    /// @return price - please read the documentation of PythStructs.Price to understand how to use this safely.
    function getPriceUnsafe(
        bytes32 id
    ) external view returns (PythStructs.Price memory price);

    /// @notice Returns the price that is no older than `age` seconds of the current time.
    /// @dev This function is a sanity-checked version of `getPriceUnsafe` which is useful in
    /// applications that require a sufficiently-recent price. Reverts if the price wasn't updated sufficiently
    /// recently.
    /// @return price - please read the documentation of PythStructs.Price to understand how to use this safely.
    function getPriceNoOlderThan(
        bytes32 id,
        uint age
    ) external view returns (PythStructs.Price memory price);

    /// @notice Returns the exponentially-weighted moving average price of a price feed without any sanity checks.
    /// @dev This function returns the same price as `getEmaPrice` in the case where the price is available.
    /// However, if the price is not recent this function returns the latest available price.
    ///
    /// The returned price can be from arbitrarily far in the past; this function makes no guarantees that
    /// the returned price is recent or useful for any particular application.
    ///
    /// Users of this function should check the `publishTime` in the price to ensure that the returned price is
    /// sufficiently recent for their application. If you are considering using this function, it may be
    /// safer / easier to use either `getEmaPrice` or `getEmaPriceNoOlderThan`.
    /// @return price - please read the documentation of PythStructs.Price to understand how to use this safely.
    function getEmaPriceUnsafe(
        bytes32 id
    ) external view returns (PythStructs.Price memory price);

    /// @notice Returns the exponentially-weighted moving average price that is no older than `age` seconds
    /// of the current time.
    /// @dev This function is a sanity-checked version of `getEmaPriceUnsafe` which is useful in
    /// applications that require a sufficiently-recent price. Reverts if the price wasn't updated sufficiently
    /// recently.
    /// @return price - please read the documentation of PythStructs.Price to understand how to use this safely.
    function getEmaPriceNoOlderThan(
        bytes32 id,
        uint age
    ) external view returns (PythStructs.Price memory price);

    /// @notice Update price feeds with given update messages.
    /// This method requires the caller to pay a fee in wei; the required fee can be computed by calling
    /// `getUpdateFee` with the length of the `updateData` array.
    /// Prices will be updated if they are more recent than the current stored prices.
    /// The call will succeed even if the update is not the most recent.
    /// @dev Reverts if the transferred fee is not sufficient or the updateData is invalid.
    /// @param updateData Array of price update data.
    function updatePriceFeeds(bytes[] calldata updateData) external payable;

    /// @notice Wrapper around updatePriceFeeds that rejects fast if a price update is not necessary. A price update is
    /// necessary if the current on-chain publishTime is older than the given publishTime. It relies solely on the
    /// given `publishTimes` for the price feeds and does not read the actual price update publish time within `updateData`.
    ///
    /// This method requires the caller to pay a fee in wei; the required fee can be computed by calling
    /// `getUpdateFee` with the length of the `updateData` array.
    ///
    /// `priceIds` and `publishTimes` are two arrays with the same size that correspond to senders known publishTime
    /// of each priceId when calling this method. If all of price feeds within `priceIds` have updated and have
    /// a newer or equal publish time than the given publish time, it will reject the transaction to save gas.
    /// Otherwise, it calls updatePriceFeeds method to update the prices.
    ///
    /// @dev Reverts if update is not needed or the transferred fee is not sufficient or the updateData is invalid.
    /// @param updateData Array of price update data.
    /// @param priceIds Array of price ids.
    /// @param publishTimes Array of publishTimes. `publishTimes[i]` corresponds to known `publishTime` of `priceIds[i]`
    function updatePriceFeedsIfNecessary(
        bytes[] calldata updateData,
        bytes32[] calldata priceIds,
        uint64[] calldata publishTimes
    ) external payable;

    /// @notice Returns the required fee to update an array of price updates.
    /// @param updateData Array of price update data.
    /// @return feeAmount The required fee in Wei.
    function getUpdateFee(
        bytes[] calldata updateData
    ) external view returns (uint feeAmount);

    /// @notice Parse `updateData` and return price feeds of the given `priceIds` if they are all published
    /// within `minPublishTime` and `maxPublishTime`.
    ///
    /// You can use this method if you want to use a Pyth price at a fixed time and not the most recent price;
    /// otherwise, please consider using `updatePriceFeeds`. This method may store the price updates on-chain, if they
    /// are more recent than the current stored prices.
    ///
    /// This method requires the caller to pay a fee in wei; the required fee can be computed by calling
    /// `getUpdateFee` with the length of the `updateData` array.
    ///
    ///
    /// @dev Reverts if the transferred fee is not sufficient or the updateData is invalid or there is
    /// no update for any of the given `priceIds` within the given time range.
    /// @param updateData Array of price update data.
    /// @param priceIds Array of price ids.
    /// @param minPublishTime minimum acceptable publishTime for the given `priceIds`.
    /// @param maxPublishTime maximum acceptable publishTime for the given `priceIds`.
    /// @return priceFeeds Array of the price feeds corresponding to the given `priceIds` (with the same order).
    function parsePriceFeedUpdates(
        bytes[] calldata updateData,
        bytes32[] calldata priceIds,
        uint64 minPublishTime,
        uint64 maxPublishTime
    ) external payable returns (PythStructs.PriceFeed[] memory priceFeeds);

    /// @notice Similar to `parsePriceFeedUpdates` but ensures the updates returned are
    /// the first updates published in minPublishTime. That is, if there are multiple updates for a given timestamp,
    /// this method will return the first update. This method may store the price updates on-chain, if they
    /// are more recent than the current stored prices.
    ///
    ///
    /// @dev Reverts if the transferred fee is not sufficient or the updateData is invalid or there is
    /// no update for any of the given `priceIds` within the given time range and uniqueness condition.
    /// @param updateData Array of price update data.
    /// @param priceIds Array of price ids.
    /// @param minPublishTime minimum acceptable publishTime for the given `priceIds`.
    /// @param maxPublishTime maximum acceptable publishTime for the given `priceIds`.
    /// @return priceFeeds Array of the price feeds corresponding to the given `priceIds` (with the same order).
    function parsePriceFeedUpdatesUnique(
        bytes[] calldata updateData,
        bytes32[] calldata priceIds,
        uint64 minPublishTime,
        uint64 maxPublishTime
    ) external payable returns (PythStructs.PriceFeed[] memory priceFeeds);
}