/*
 * Copyright 2023, 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 Foundation
import GRPC
import GRPCReflectionService
import NIOPosix
import SwiftProtobuf
import XCTest

@testable import GRPCReflectionService

final class ReflectionServiceIntegrationTests: GRPCTestCase {
  private var server: Server?
  private var channel: GRPCChannel?
  private let protos: [Google_Protobuf_FileDescriptorProto] = makeProtosWithDependencies()
  private let independentProto: Google_Protobuf_FileDescriptorProto = generateFileDescriptorProto(
    fileName: "independentBar",
    suffix: 5
  )

  private func setUpServerAndChannel() throws {
    let reflectionServiceProvider = try ReflectionService(
      fileDescriptors: self.protos + [self.independentProto]
    )

    let server = try Server.insecure(group: MultiThreadedEventLoopGroup.singleton)
      .withServiceProviders([reflectionServiceProvider])
      .withLogger(self.serverLogger)
      .bind(host: "127.0.0.1", port: 0)
      .wait()
    self.server = server

    let channel = try GRPCChannelPool.with(
      target: .hostAndPort("127.0.0.1", server.channel.localAddress!.port!),
      transportSecurity: .plaintext,
      eventLoopGroup: MultiThreadedEventLoopGroup.singleton
    ) {
      $0.backgroundActivityLogger = self.clientLogger
    }

    self.channel = channel
  }

  override func tearDown() {
    if let channel = self.channel {
      XCTAssertNoThrow(try channel.close().wait())
    }
    if let server = self.server {
      XCTAssertNoThrow(try server.close().wait())
    }

    super.tearDown()
  }

  func testFileByFileName() async throws {
    try self.setUpServerAndChannel()
    let client = Reflection_ServerReflectionAsyncClient(channel: self.channel!)
    let serviceReflectionInfo = client.makeServerReflectionInfoCall()
    try await serviceReflectionInfo.requestStream.send(
      .with {
        $0.host = "127.0.0.1"
        $0.fileByFilename = "bar1.proto"
      }
    )
    serviceReflectionInfo.requestStream.finish()

    var iterator = serviceReflectionInfo.responseStream.makeAsyncIterator()
    guard let message = try await iterator.next() else {
      return XCTFail("Could not get a response message.")
    }

    let receivedFileDescriptorProto =
      try Google_Protobuf_FileDescriptorProto(
        serializedData: (message.fileDescriptorResponse
          .fileDescriptorProto[0])
      )

    XCTAssertEqual(receivedFileDescriptorProto.name, "bar1.proto")
    XCTAssertEqual(receivedFileDescriptorProto.service.count, 1)

    guard let service = receivedFileDescriptorProto.service.first else {
      return XCTFail("The received file descriptor proto doesn't have any services.")
    }
    guard let method = service.method.first else {
      return XCTFail("The service of the received file descriptor proto doesn't have any methods.")
    }
    XCTAssertEqual(method.name, "testMethod1")
    XCTAssertEqual(message.fileDescriptorResponse.fileDescriptorProto.count, 4)
  }

  func testListServices() async throws {
    try self.setUpServerAndChannel()
    let client = Reflection_ServerReflectionAsyncClient(channel: self.channel!)
    let serviceReflectionInfo = client.makeServerReflectionInfoCall()

    try await serviceReflectionInfo.requestStream.send(
      .with {
        $0.host = "127.0.0.1"
        $0.listServices = "services"
      }
    )

    serviceReflectionInfo.requestStream.finish()
    var iterator = serviceReflectionInfo.responseStream.makeAsyncIterator()
    guard let message = try await iterator.next() else {
      return XCTFail("Could not get a response message.")
    }

    let receivedServices = message.listServicesResponse.service.map { $0.name }.sorted()
    let servicesNames = (self.protos + [self.independentProto]).serviceNames.sorted()

    XCTAssertEqual(receivedServices, servicesNames)
  }

  func testFileBySymbol() async throws {
    try self.setUpServerAndChannel()
    let client = Reflection_ServerReflectionAsyncClient(channel: self.channel!)
    let serviceReflectionInfo = client.makeServerReflectionInfoCall()

    try await serviceReflectionInfo.requestStream.send(
      .with {
        $0.host = "127.0.0.1"
        $0.fileContainingSymbol = "packagebar1.enumType1"
      }
    )

    serviceReflectionInfo.requestStream.finish()
    var iterator = serviceReflectionInfo.responseStream.makeAsyncIterator()
    guard let message = try await iterator.next() else {
      return XCTFail("Could not get a response message.")
    }
    let receivedData: [Google_Protobuf_FileDescriptorProto]
    do {
      receivedData = try message.fileDescriptorResponse.fileDescriptorProto.map {
        try Google_Protobuf_FileDescriptorProto(serializedData: $0)
      }
    } catch {
      return XCTFail("Could not serialize data received as a message.")
    }

    let fileToFind = self.protos[0]
    let dependentProtos = self.protos[1...]
    for fileDescriptorProto in receivedData {
      if fileDescriptorProto == fileToFind {
        XCTAssert(
          fileDescriptorProto.enumType.names.contains("enumType1"),
          """
          The response doesn't contain the serialized file descriptor proto \
          containing the \"packagebar1.enumType1\" symbol.
          """
        )
      } else {
        XCTAssert(
          dependentProtos.contains(fileDescriptorProto),
          """
          The \(fileDescriptorProto.name) is not a dependency of the \
          proto file containing the \"packagebar1.enumType1\" symbol.
          """
        )
      }
    }
  }
}