// SPDX-License-Identifier: Apache 2
pragma solidity ^0.8.0;

import "./EntropyEvents.sol";
import "./EntropyEventsV2.sol";
import "./EntropyStructsV2.sol";

interface IEntropy is EntropyEvents, EntropyEventsV2 {
    // Register msg.sender as a randomness provider. The arguments are the provider's configuration parameters
    // and initial commitment. Re-registering the same provider rotates the provider's commitment (and updates
    // the feeInWei).
    //
    // chainLength is the number of values in the hash chain *including* the commitment, that is, chainLength >= 1.
    function register(
        uint128 feeInWei,
        bytes32 commitment,
        bytes calldata commitmentMetadata,
        uint64 chainLength,
        bytes calldata uri
    ) external;

    // Withdraw a portion of the accumulated fees for the provider msg.sender.
    // Calling this function will transfer `amount` wei to the caller (provided that they have accrued a sufficient
    // balance of fees in the contract).
    function withdraw(uint128 amount) external;

    // Withdraw a portion of the accumulated fees for provider. The msg.sender must be the fee manager for this provider.
    // Calling this function will transfer `amount` wei to the caller (provided that they have accrued a sufficient
    // balance of fees in the contract).
    function withdrawAsFeeManager(address provider, uint128 amount) external;

    /// @notice Request a random number using the default provider with default gas limit
    /// @return assignedSequenceNumber A unique identifier for this request
    /// @dev The address calling this function should be a contract that inherits from the IEntropyConsumer interface.
    /// The `entropyCallback` method on that interface will receive a callback with the returned sequence number and
    /// the generated random number.
    ///
    /// `entropyCallback` will be run with the `gasLimit` provided to this function.
    /// The `gasLimit` will be rounded up to a multiple of 10k (e.g., 19000 -> 20000), and furthermore is lower bounded
    /// by the provider's configured default limit.
    ///
    /// This method will revert unless the caller provides a sufficient fee (at least `getFeeV2()`) as msg.value.
    /// Note that the fee can change over time. Callers of this method should explicitly compute `getFeeV2()`
    /// prior to each invocation (as opposed to hardcoding a value). Further note that excess value is *not* refunded to the caller.
    ///
    /// Note that this method uses an in-contract PRNG to generate the user's portion of the random number.
    /// Users must trust this PRNG in order to prove the result is random. If you wish to avoid this trust assumption,
    /// call a variant of `requestV2` that accepts a `userRandomNumber` parameter.
    function requestV2()
        external
        payable
        returns (uint64 assignedSequenceNumber);

    /// @notice Request a random number using the default provider with specified gas limit
    /// @param gasLimit The gas limit for the callback function.
    /// @return assignedSequenceNumber A unique identifier for this request
    /// @dev The address calling this function should be a contract that inherits from the IEntropyConsumer interface.
    /// The `entropyCallback` method on that interface will receive a callback with the returned sequence number and
    /// the generated random number.
    ///
    /// `entropyCallback` will be run with the `gasLimit` provided to this function.
    /// The `gasLimit` will be rounded up to a multiple of 10k (e.g., 19000 -> 20000), and furthermore is lower bounded
    /// by the provider's configured default limit.
    ///
    /// This method will revert unless the caller provides a sufficient fee (at least `getFeeV2(gasLimit)`) as msg.value.
    /// Note that the fee can change over time. Callers of this method should explicitly compute `getFeeV2(gasLimit)`
    /// prior to each invocation (as opposed to hardcoding a value). Further note that excess value is *not* refunded to the caller.
    ///
    /// Note that this method uses an in-contract PRNG to generate the user's portion of the random number.
    /// Users must trust this PRNG in order to prove the result is random. If you wish to avoid this trust assumption,
    /// call a variant of `requestV2` that accepts a `userRandomNumber` parameter.
    function requestV2(
        uint32 gasLimit
    ) external payable returns (uint64 assignedSequenceNumber);

    /// @notice Request a random number from a specific provider with specified gas limit
    /// @param provider The address of the provider to request from
    /// @param gasLimit The gas limit for the callback function
    /// @return assignedSequenceNumber A unique identifier for this request
    /// @dev The address calling this function should be a contract that inherits from the IEntropyConsumer interface.
    /// The `entropyCallback` method on that interface will receive a callback with the returned sequence number and
    /// the generated random number.
    ///
    /// `entropyCallback` will be run with the `gasLimit` provided to this function.
    /// The `gasLimit` will be rounded up to a multiple of 10k (e.g., 19000 -> 20000), and furthermore is lower bounded
    /// by the provider's configured default limit.
    ///
    /// This method will revert unless the caller provides a sufficient fee (at least `getFeeV2(provider, gasLimit)`) as msg.value.
    /// Note that provider fees can change over time. Callers of this method should explicitly compute `getFeeV2(provider, gasLimit)`
    /// prior to each invocation (as opposed to hardcoding a value). Further note that excess value is *not* refunded to the caller.
    ///
    /// Note that this method uses an in-contract PRNG to generate the user's portion of the random number.
    /// Users must trust this PRNG in order to prove the result is random. If you wish to avoid this trust assumption,
    /// call a variant of `requestV2` that accepts a `userRandomNumber` parameter.
    function requestV2(
        address provider,
        uint32 gasLimit
    ) external payable returns (uint64 assignedSequenceNumber);

    /// @notice Request a random number from a specific provider with a user-provided random number and gas limit
    /// @param provider The address of the provider to request from
    /// @param userRandomNumber A random number provided by the user for additional entropy
    /// @param gasLimit The gas limit for the callback function
    /// @return assignedSequenceNumber A unique identifier for this request
    /// @dev The address calling this function should be a contract that inherits from the IEntropyConsumer interface.
    /// The `entropyCallback` method on that interface will receive a callback with the returned sequence number and
    /// the generated random number.
    ///
    /// `entropyCallback` will be run with the `gasLimit` provided to this function.
    /// The `gasLimit` will be rounded up to a multiple of 10k (e.g., 19000 -> 20000), and furthermore is lower bounded
    /// by the provider's configured default limit.
    ///
    /// This method will revert unless the caller provides a sufficient fee (at least `getFeeV2(provider, gasLimit)`) as msg.value.
    /// Note that provider fees can change over time. Callers of this method should explicitly compute `getFeeV2(provider, gasLimit)`
    /// prior to each invocation (as opposed to hardcoding a value). Further note that excess value is *not* refunded to the caller.
    function requestV2(
        address provider,
        bytes32 userRandomNumber,
        uint32 gasLimit
    ) external payable returns (uint64 assignedSequenceNumber);

    // As a user, request a random number from `provider`. Prior to calling this method, the user should
    // generate a random number x and keep it secret. The user should then compute hash(x) and pass that
    // as the userCommitment argument. (You may call the constructUserCommitment method to compute the hash.)
    //
    // This method returns a sequence number. The user should pass this sequence number to
    // their chosen provider (the exact method for doing so will depend on the provider) to retrieve the provider's
    // number. The user should then call fulfillRequest to construct the final random number.
    //
    // This method will revert unless the caller provides a sufficient fee (at least getFee(provider)) as msg.value.
    // Note that excess value is *not* refunded to the caller.
    function request(
        address provider,
        bytes32 userCommitment,
        bool useBlockHash
    ) external payable returns (uint64 assignedSequenceNumber);

    // Request a random number. The method expects the provider address and a secret random number
    // in the arguments. It returns a sequence number.
    //
    // The address calling this function should be a contract that inherits from the IEntropyConsumer interface.
    // The `entropyCallback` method on that interface will receive a callback with the generated random number.
    // `entropyCallback` will be run with the provider's default gas limit (see `getProviderInfo(provider).defaultGasLimit`).
    // If your callback needs additional gas, please use `requestWithCallbackAndGasLimit`.
    //
    // This method will revert unless the caller provides a sufficient fee (at least `getFee(provider)`) as msg.value.
    // Note that excess value is *not* refunded to the caller.
    function requestWithCallback(
        address provider,
        bytes32 userRandomNumber
    ) external payable returns (uint64 assignedSequenceNumber);

    // Fulfill a request for a random number. This method validates the provided userRandomness and provider's proof
    // against the corresponding commitments in the in-flight request. If both values are validated, this function returns
    // the corresponding random number.
    //
    // Note that this function can only be called once per in-flight request. Calling this function deletes the stored
    // request information (so that the contract doesn't use a linear amount of storage in the number of requests).
    // If you need to use the returned random number more than once, you are responsible for storing it.
    function reveal(
        address provider,
        uint64 sequenceNumber,
        bytes32 userRevelation,
        bytes32 providerRevelation
    ) external returns (bytes32 randomNumber);

    // Fulfill a request for a random number. This method validates the provided userRandomness
    // and provider's revelation against the corresponding commitment in the in-flight request. If both values are validated
    // and the requestor address is a contract address, this function calls the requester's entropyCallback method with the
    // sequence number, provider address and the random number as arguments. Else if the requestor is an EOA, it won't call it.
    //
    // Note that this function can only be called once per in-flight request. Calling this function deletes the stored
    // request information (so that the contract doesn't use a linear amount of storage in the number of requests).
    // If you need to use the returned random number more than once, you are responsible for storing it.
    //
    // Anyone can call this method to fulfill a request, but the callback will only be made to the original requester.
    function revealWithCallback(
        address provider,
        uint64 sequenceNumber,
        bytes32 userRandomNumber,
        bytes32 providerRevelation
    ) external;

    function getProviderInfo(
        address provider
    ) external view returns (EntropyStructs.ProviderInfo memory info);

    function getProviderInfoV2(
        address provider
    ) external view returns (EntropyStructsV2.ProviderInfo memory info);

    function getDefaultProvider() external view returns (address provider);

    function getRequest(
        address provider,
        uint64 sequenceNumber
    ) external view returns (EntropyStructs.Request memory req);

    function getRequestV2(
        address provider,
        uint64 sequenceNumber
    ) external view returns (EntropyStructsV2.Request memory req);

    // Get the fee charged by provider for a request with the default gasLimit (`request` or `requestWithCallback`).
    // If you are calling any of the `requestV2` methods, please use `getFeeV2`.
    function getFee(address provider) external view returns (uint128 feeAmount);

    // Get the fee charged by the default provider for the default gas limit.
    // Use this function to determine the fee to pass to `requestV2`.
    function getFeeV2() external view returns (uint128 feeAmount);

    // Get the fee charged by the default provider for the specified gas limit.
    // Use this function to determine the fee to pass to `requestV2`.
    function getFeeV2(
        uint32 gasLimit
    ) external view returns (uint128 feeAmount);

    // Get the fee charged by `provider` for a request with a specific `gasLimit`.
    // Use this function to determine the fee to pass to `requestV2`.
    function getFeeV2(
        address provider,
        uint32 gasLimit
    ) external view returns (uint128 feeAmount);

    function getAccruedPythFees()
        external
        view
        returns (uint128 accruedPythFeesInWei);

    function setProviderFee(uint128 newFeeInWei) external;

    function setProviderFeeAsFeeManager(
        address provider,
        uint128 newFeeInWei
    ) external;

    function setProviderUri(bytes calldata newUri) external;

    // Set manager as the fee manager for the provider msg.sender.
    // After calling this function, manager will be able to set the provider's fees and withdraw them.
    // Only one address can be the fee manager for a provider at a time -- calling this function again with a new value
    // will override the previous value. Call this function with the all-zero address to disable the fee manager role.
    function setFeeManager(address manager) external;

    // Set the maximum number of hashes to record in a request. This should be set according to the maximum gas limit
    // the provider supports for callbacks.
    function setMaxNumHashes(uint32 maxNumHashes) external;

    // Set the default gas limit for a request. If 0, no
    function setDefaultGasLimit(uint32 gasLimit) external;

    // Advance the provider commitment and increase the sequence number.
    // This is used to reduce the `numHashes` required for future requests which leads to reduced gas usage.
    function advanceProviderCommitment(
        address provider,
        uint64 advancedSequenceNumber,
        bytes32 providerRevelation
    ) external;

    function constructUserCommitment(
        bytes32 userRandomness
    ) external pure returns (bytes32 userCommitment);

    function combineRandomValues(
        bytes32 userRandomness,
        bytes32 providerRandomness,
        bytes32 blockHash
    ) external pure returns (bytes32 combinedRandomness);
}