//
// Copyright 2020-2021 Signal Messenger, LLC.
// SPDX-License-Identifier: AGPL-3.0-only
//

import Foundation
import SignalFfi

public class ServerZkReceiptOperations {
    let serverSecretParams: ServerSecretParams

    public init(serverSecretParams: ServerSecretParams) {
        self.serverSecretParams = serverSecretParams
    }

    public func issueReceiptCredential(
        receiptCredentialRequest: ReceiptCredentialRequest,
        receiptExpirationTime: UInt64,
        receiptLevel: UInt64
    ) throws -> ReceiptCredentialResponse {
        return try self.issueReceiptCredential(
            randomness: Randomness.generate(),
            receiptCredentialRequest: receiptCredentialRequest,
            receiptExpirationTime: receiptExpirationTime,
            receiptLevel: receiptLevel
        )
    }

    public func issueReceiptCredential(
        randomness: Randomness,
        receiptCredentialRequest: ReceiptCredentialRequest,
        receiptExpirationTime: UInt64,
        receiptLevel: UInt64
    ) throws -> ReceiptCredentialResponse {
        return try self.serverSecretParams.withNativeHandle { serverSecretParams in
            try randomness.withUnsafePointerToBytes { randomness in
                try receiptCredentialRequest.withUnsafePointerToSerialized { receiptCredentialRequest in
                    try invokeFnReturningSerialized {
                        signal_server_secret_params_issue_receipt_credential_deterministic(
                            $0,
                            serverSecretParams.const(),
                            randomness,
                            receiptCredentialRequest,
                            receiptExpirationTime,
                            receiptLevel
                        )
                    }
                }
            }
        }
    }

    public func verifyReceiptCredentialPresentation(receiptCredentialPresentation: ReceiptCredentialPresentation) throws
    {
        try self.serverSecretParams.withNativeHandle { serverSecretParams in
            try receiptCredentialPresentation.withUnsafePointerToSerialized { receiptCredentialPresentation in
                try checkError(
                    signal_server_secret_params_verify_receipt_credential_presentation(
                        serverSecretParams.const(),
                        receiptCredentialPresentation
                    )
                )
            }
        }
    }
}