//
// DO NOT EDIT.
//
// Generated by the protocol buffer compiler.
// Source: echo.proto
//

//
// Copyright 2018, gRPC Authors All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
import GRPC
import NIO
import SwiftProtobuf


/// Usage: instantiate Echo_EchoClient, then call methods of this protocol to make API calls.
internal protocol Echo_EchoClientProtocol: GRPCClient {
  var interceptors: Echo_EchoClientInterceptorFactoryProtocol? { get }

  func get(
    _ request: Echo_EchoRequest,
    callOptions: CallOptions?
  ) -> UnaryCall<Echo_EchoRequest, Echo_EchoResponse>

  func expand(
    _ request: Echo_EchoRequest,
    callOptions: CallOptions?,
    handler: @escaping (Echo_EchoResponse) -> Void
  ) -> ServerStreamingCall<Echo_EchoRequest, Echo_EchoResponse>

  func collect(
    callOptions: CallOptions?
  ) -> ClientStreamingCall<Echo_EchoRequest, Echo_EchoResponse>

  func update(
    callOptions: CallOptions?,
    handler: @escaping (Echo_EchoResponse) -> Void
  ) -> BidirectionalStreamingCall<Echo_EchoRequest, Echo_EchoResponse>
}

extension Echo_EchoClientProtocol {

  /// Immediately returns an echo of a request.
  ///
  /// - Parameters:
  ///   - request: Request to send to Get.
  ///   - callOptions: Call options.
  /// - Returns: A `UnaryCall` with futures for the metadata, status and response.
  internal func get(
    _ request: Echo_EchoRequest,
    callOptions: CallOptions? = nil
  ) -> UnaryCall<Echo_EchoRequest, Echo_EchoResponse> {
    return self.makeUnaryCall(
      path: "/echo.Echo/Get",
      request: request,
      callOptions: callOptions ?? self.defaultCallOptions,
      interceptors: self.interceptors?.makeGetInterceptors() ?? []
    )
  }

  /// Splits a request into words and returns each word in a stream of messages.
  ///
  /// - Parameters:
  ///   - request: Request to send to Expand.
  ///   - callOptions: Call options.
  ///   - handler: A closure called when each response is received from the server.
  /// - Returns: A `ServerStreamingCall` with futures for the metadata and status.
  internal func expand(
    _ request: Echo_EchoRequest,
    callOptions: CallOptions? = nil,
    handler: @escaping (Echo_EchoResponse) -> Void
  ) -> ServerStreamingCall<Echo_EchoRequest, Echo_EchoResponse> {
    return self.makeServerStreamingCall(
      path: "/echo.Echo/Expand",
      request: request,
      callOptions: callOptions ?? self.defaultCallOptions,
      interceptors: self.interceptors?.makeExpandInterceptors() ?? [],
      handler: handler
    )
  }

  /// Collects a stream of messages and returns them concatenated when the caller closes.
  ///
  /// Callers should use the `send` method on the returned object to send messages
  /// to the server. The caller should send an `.end` after the final message has been sent.
  ///
  /// - Parameters:
  ///   - callOptions: Call options.
  /// - Returns: A `ClientStreamingCall` with futures for the metadata, status and response.
  internal func collect(
    callOptions: CallOptions? = nil
  ) -> ClientStreamingCall<Echo_EchoRequest, Echo_EchoResponse> {
    return self.makeClientStreamingCall(
      path: "/echo.Echo/Collect",
      callOptions: callOptions ?? self.defaultCallOptions,
      interceptors: self.interceptors?.makeCollectInterceptors() ?? []
    )
  }

  /// Streams back messages as they are received in an input stream.
  ///
  /// Callers should use the `send` method on the returned object to send messages
  /// to the server. The caller should send an `.end` after the final message has been sent.
  ///
  /// - Parameters:
  ///   - callOptions: Call options.
  ///   - handler: A closure called when each response is received from the server.
  /// - Returns: A `ClientStreamingCall` with futures for the metadata and status.
  internal func update(
    callOptions: CallOptions? = nil,
    handler: @escaping (Echo_EchoResponse) -> Void
  ) -> BidirectionalStreamingCall<Echo_EchoRequest, Echo_EchoResponse> {
    return self.makeBidirectionalStreamingCall(
      path: "/echo.Echo/Update",
      callOptions: callOptions ?? self.defaultCallOptions,
      interceptors: self.interceptors?.makeUpdateInterceptors() ?? [],
      handler: handler
    )
  }
}

internal protocol Echo_EchoClientInterceptorFactoryProtocol {
  /// Makes an array of generic interceptors. The per-method interceptor
  /// factories default to calling this function and it therefore provides a
  /// convenient way of setting interceptors for all methods on a client.
  /// - Returns: An array of interceptors generic over `Request` and `Response`.
  ///   Defaults to an empty array.
  func makeInterceptors<Request: SwiftProtobuf.Message, Response: SwiftProtobuf.Message>() -> [ClientInterceptor<Request, Response>]

  /// - Returns: Interceptors to use when invoking 'get'.
  ///   Defaults to calling `self.makeInterceptors()`.
  func makeGetInterceptors() -> [ClientInterceptor<Echo_EchoRequest, Echo_EchoResponse>]

  /// - Returns: Interceptors to use when invoking 'expand'.
  ///   Defaults to calling `self.makeInterceptors()`.
  func makeExpandInterceptors() -> [ClientInterceptor<Echo_EchoRequest, Echo_EchoResponse>]

  /// - Returns: Interceptors to use when invoking 'collect'.
  ///   Defaults to calling `self.makeInterceptors()`.
  func makeCollectInterceptors() -> [ClientInterceptor<Echo_EchoRequest, Echo_EchoResponse>]

  /// - Returns: Interceptors to use when invoking 'update'.
  ///   Defaults to calling `self.makeInterceptors()`.
  func makeUpdateInterceptors() -> [ClientInterceptor<Echo_EchoRequest, Echo_EchoResponse>]
}

extension Echo_EchoClientInterceptorFactoryProtocol {
  internal func makeInterceptors<Request: SwiftProtobuf.Message, Response: SwiftProtobuf.Message>() -> [ClientInterceptor<Request, Response>] {
    return []
  }

  internal func makeGetInterceptors() -> [ClientInterceptor<Echo_EchoRequest, Echo_EchoResponse>] {
    return self.makeInterceptors()
  }

  internal func makeExpandInterceptors() -> [ClientInterceptor<Echo_EchoRequest, Echo_EchoResponse>] {
    return self.makeInterceptors()
  }

  internal func makeCollectInterceptors() -> [ClientInterceptor<Echo_EchoRequest, Echo_EchoResponse>] {
    return self.makeInterceptors()
  }

  internal func makeUpdateInterceptors() -> [ClientInterceptor<Echo_EchoRequest, Echo_EchoResponse>] {
    return self.makeInterceptors()
  }
}

internal final class Echo_EchoClient: Echo_EchoClientProtocol {
  internal let channel: GRPCChannel
  internal var defaultCallOptions: CallOptions
  internal var interceptors: Echo_EchoClientInterceptorFactoryProtocol?

  /// Creates a client for the echo.Echo service.
  ///
  /// - Parameters:
  ///   - channel: `GRPCChannel` to the service host.
  ///   - defaultCallOptions: Options to use for each service call if the user doesn't provide them.
  ///   - interceptors: A factory providing interceptors for each RPC.
  internal init(
    channel: GRPCChannel,
    defaultCallOptions: CallOptions = CallOptions(),
    interceptors: Echo_EchoClientInterceptorFactoryProtocol? = nil
  ) {
    self.channel = channel
    self.defaultCallOptions = defaultCallOptions
    self.interceptors = interceptors
  }
}

/// To build a server, implement a class that conforms to this protocol.
internal protocol Echo_EchoProvider: CallHandlerProvider {
  /// Immediately returns an echo of a request.
  func get(request: Echo_EchoRequest, context: StatusOnlyCallContext) -> EventLoopFuture<Echo_EchoResponse>
  /// Splits a request into words and returns each word in a stream of messages.
  func expand(request: Echo_EchoRequest, context: StreamingResponseCallContext<Echo_EchoResponse>) -> EventLoopFuture<GRPCStatus>
  /// Collects a stream of messages and returns them concatenated when the caller closes.
  func collect(context: UnaryResponseCallContext<Echo_EchoResponse>) -> EventLoopFuture<(StreamEvent<Echo_EchoRequest>) -> Void>
  /// Streams back messages as they are received in an input stream.
  func update(context: StreamingResponseCallContext<Echo_EchoResponse>) -> EventLoopFuture<(StreamEvent<Echo_EchoRequest>) -> Void>
}

extension Echo_EchoProvider {
  internal var serviceName: Substring { return "echo.Echo" }

  /// Determines, calls and returns the appropriate request handler, depending on the request's method.
  /// Returns nil for methods not handled by this service.
  internal func handleMethod(_ methodName: Substring, callHandlerContext: CallHandlerContext) -> GRPCCallHandler? {
    switch methodName {
    case "Get":
      return CallHandlerFactory.makeUnary(callHandlerContext: callHandlerContext) { context in
        return { request in
          self.get(request: request, context: context)
        }
      }

    case "Expand":
      return CallHandlerFactory.makeServerStreaming(callHandlerContext: callHandlerContext) { context in
        return { request in
          self.expand(request: request, context: context)
        }
      }

    case "Collect":
      return CallHandlerFactory.makeClientStreaming(callHandlerContext: callHandlerContext) { context in
        return self.collect(context: context)
      }

    case "Update":
      return CallHandlerFactory.makeBidirectionalStreaming(callHandlerContext: callHandlerContext) { context in
        return self.update(context: context)
      }

    default: return nil
    }
  }
}