/*
 *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#import <XCTest/XCTest.h>

#include <stdlib.h>

#include "api/environment/environment.h"
#include "api/scoped_refptr.h"
#include "test/create_test_environment.h"

#import "sdk/objc/components/audio/RTCAudioSession+Private.h"
#import "sdk/objc/native/api/audio_device_module.h"
#import "sdk/objc/native/src/audio/audio_device_ios.h"

@interface RTCAudioDeviceTests : XCTestCase {
  bool _testEnabled;
  webrtc::scoped_refptr<webrtc::AudioDeviceModule> _audioDeviceModule;
  std::unique_ptr<webrtc::ios_adm::AudioDeviceIOS> _audio_device;
}

@property(nonatomic) RTC_OBJC_TYPE(RTCAudioSession) * audioSession;

@end

@implementation RTCAudioDeviceTests

@synthesize audioSession = _audioSession;

- (void)setUp {
  [super setUp];
#if defined(WEBRTC_IOS) && TARGET_OS_SIMULATOR
  // TODO(peterhanspers): Reenable these tests on simulator.
  // See bugs.webrtc.org/7812
  _testEnabled = false;
  if (::getenv("WEBRTC_IOS_RUN_AUDIO_TESTS") != nullptr) {
    _testEnabled = true;
  }
#else
  _testEnabled = true;
#endif

  webrtc::Environment env = webrtc::CreateTestEnvironment();
  _audioDeviceModule = webrtc::CreateAudioDeviceModule(env);
  _audio_device.reset(new webrtc::ios_adm::AudioDeviceIOS(
      env,
      /*bypass_voice_processing=*/false,
      /*muted_speech_event_handler=*/nullptr,
      /*render_error_handler=*/nullptr));
  self.audioSession = [RTC_OBJC_TYPE(RTCAudioSession) sharedInstance];

  NSError *error = nil;
  [self.audioSession lockForConfiguration];
  [self.audioSession setCategory:AVAudioSessionCategoryPlayAndRecord
                     withOptions:0
                           error:&error];
  XCTAssertNil(error);

  [self.audioSession setMode:AVAudioSessionModeVoiceChat error:&error];
  XCTAssertNil(error);

  [self.audioSession setActive:YES error:&error];
  XCTAssertNil(error);

  [self.audioSession unlockForConfiguration];
}

- (void)tearDown {
  _audio_device->Terminate();
  _audio_device.reset(nullptr);
  _audioDeviceModule = nullptr;
  [self.audioSession notifyDidEndInterruptionWithShouldResumeSession:NO];

  [super tearDown];
}

// Verifies that the AudioDeviceIOS is_interrupted_ flag is reset correctly
// after an iOS AVAudioSessionInterruptionTypeEnded notification event.
// AudioDeviceIOS listens to RTC_OBJC_TYPE(RTCAudioSession) interrupted
// notifications by:
// - In AudioDeviceIOS.InitPlayOrRecord registers its audio_session_observer_
//   callback with RTC_OBJC_TYPE(RTCAudioSession)'s delegate list.
// - When RTC_OBJC_TYPE(RTCAudioSession) receives an iOS audio interrupted
// notification, it
//   passes the notification to callbacks in its delegate list which sets
//   AudioDeviceIOS's is_interrupted_ flag to true.
// - When AudioDeviceIOS.ShutdownPlayOrRecord is called, its
//   audio_session_observer_ callback is removed from RTCAudioSessions's
//   delegate list.
//   So if RTC_OBJC_TYPE(RTCAudioSession) receives an iOS end audio interruption
//   notification, AudioDeviceIOS is not notified as its callback is not in
//   RTC_OBJC_TYPE(RTCAudioSession)'s delegate list. This causes
//   AudioDeviceIOS's is_interrupted_ flag to be in the wrong (true) state and
//   the audio session will ignore audio changes.
// As RTC_OBJC_TYPE(RTCAudioSession) keeps its own interrupted state, the fix is
// to initialize AudioDeviceIOS's is_interrupted_ flag to
// RTC_OBJC_TYPE(RTCAudioSession)'s isInterrupted flag in
// AudioDeviceIOS.InitPlayOrRecord.
- (void)testInterruptedAudioSession {
  XCTSkipIf(!_testEnabled);
  XCTAssertTrue(self.audioSession.isActive);
  XCTAssertTrue(
      [self.audioSession.category
          isEqual:AVAudioSessionCategoryPlayAndRecord] ||
      [self.audioSession.category isEqual:AVAudioSessionCategoryPlayback]);
  XCTAssertEqual(AVAudioSessionModeVoiceChat, self.audioSession.mode);

  webrtc::AudioDeviceBuffer audio_buffer(webrtc::CreateTestEnvironment());
  _audio_device->AttachAudioBuffer(&audio_buffer);
  XCTAssertEqual(webrtc::AudioDeviceGeneric::InitStatus::OK,
                 _audio_device->Init());
  XCTAssertEqual(0, _audio_device->InitPlayout());
  XCTAssertEqual(0, _audio_device->StartPlayout());

  // Force interruption.
  [self.audioSession notifyDidBeginInterruption];

  // Wait for notification to propagate.
  webrtc::ThreadManager::ProcessAllMessageQueuesForTesting();
  XCTAssertTrue(_audio_device->IsInterrupted());

  // Force it for testing.
  _audio_device->StopPlayout();

  [self.audioSession notifyDidEndInterruptionWithShouldResumeSession:YES];
  // Wait for notification to propagate.
  webrtc::ThreadManager::ProcessAllMessageQueuesForTesting();
  XCTAssertTrue(_audio_device->IsInterrupted());

  _audio_device->Init();
  _audio_device->InitPlayout();
  XCTAssertFalse(_audio_device->IsInterrupted());
}

- (void)testMuteSpeechHandlerCalledWithStartedWhenSpeechActivityHasStarted {
  XCTestExpectation *handlerExpectation =
      [self expectationWithDescription:@"mutedSpeechHandler"];
  webrtc::AudioDeviceModule::MutedSpeechEventHandler
      muted_speech_event_handler = ^void(
          webrtc::AudioDeviceModule::MutedSpeechEvent event) {
        XCTAssertEqual(event, webrtc::AudioDeviceModule::kMutedSpeechStarted);
        [handlerExpectation fulfill];
      };

  _audio_device.reset(new webrtc::ios_adm::AudioDeviceIOS(
      webrtc::CreateTestEnvironment(),
      /*bypass_voice_processing=*/false,
      /*muted_speech_event_handler=*/muted_speech_event_handler,
      /*render_error_handler=*/nullptr));

  _audio_device->OnReceivedMutedSpeechActivity(
      kAUVoiceIOSpeechActivityHasStarted);
  [self waitForExpectations:@[ handlerExpectation ] timeout:10.0];
}

- (void)testMuteSpeechHandlerCalledWithEndedWhenSpeechActivityHasEnded {
  XCTestExpectation *handlerExpectation =
      [self expectationWithDescription:@"mutedSpeechHandler"];
  webrtc::AudioDeviceModule::MutedSpeechEventHandler
      muted_speech_event_handler =
          ^void(webrtc::AudioDeviceModule::MutedSpeechEvent event) {
            XCTAssertEqual(event, webrtc::AudioDeviceModule::kMutedSpeechEnded);
            [handlerExpectation fulfill];
          };

  _audio_device.reset(new webrtc::ios_adm::AudioDeviceIOS(
      webrtc::CreateTestEnvironment(),
      /*bypass_voice_processing=*/false,
      /*muted_speech_event_handler=*/muted_speech_event_handler,
      /*render_error_handler=*/nullptr));
  _audio_device->OnReceivedMutedSpeechActivity(
      kAUVoiceIOSpeechActivityHasEnded);
  [self waitForExpectations:@[ handlerExpectation ] timeout:10.0];
}

@end