// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "services/audio/service.h"

#include <utility>

#include "base/logging.h"
#include "base/macros.h"
#include "base/single_thread_task_runner.h"
#include "build/build_config.h"
#include "media/audio/audio_manager.h"
#include "services/audio/debug_recording.h"
#include "services/audio/system_info.h"
#include "services/service_manager/public/cpp/service_context.h"
#include "services/service_manager/public/cpp/service_context_ref.h"

namespace audio {

Service::Service(std::unique_ptr<AudioManagerAccessor> audio_manager_accessor,
                 base::TimeDelta quit_timeout)
    : quit_timeout_(quit_timeout),
      audio_manager_accessor_(std::move(audio_manager_accessor)) {
  DCHECK(audio_manager_accessor_);
}

Service::~Service() {
  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
}

void Service::OnStart() {
  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
  DVLOG(4) << "audio::Service::OnStart";
  ref_factory_ = std::make_unique<service_manager::ServiceContextRefFactory>(
      base::BindRepeating(&Service::MaybeRequestQuitDelayed,
                          base::Unretained(this)));
  registry_.AddInterface<mojom::SystemInfo>(base::BindRepeating(
      &Service::BindSystemInfoRequest, base::Unretained(this)));
  registry_.AddInterface<mojom::DebugRecording>(base::BindRepeating(
      &Service::BindDebugRecordingRequest, base::Unretained(this)));
}

void Service::OnBindInterface(
    const service_manager::BindSourceInfo& source_info,
    const std::string& interface_name,
    mojo::ScopedMessagePipeHandle interface_pipe) {
  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
  DVLOG(4) << "audio::Service::OnBindInterface";
  registry_.BindInterface(interface_name, std::move(interface_pipe));
  DCHECK(ref_factory_ && !ref_factory_->HasNoRefs());
  quit_timer_.AbandonAndStop();
}

bool Service::OnServiceManagerConnectionLost() {
  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
  // Reset |debug_recording_| to disable debug recording before AudioManager
  // shutdown.
  debug_recording_.reset();
  audio_manager_accessor_->Shutdown();
  return true;
}

void Service::SetQuitClosureForTesting(base::RepeatingClosure quit_closure) {
  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
  quit_closure_ = std::move(quit_closure);
}

void Service::BindSystemInfoRequest(mojom::SystemInfoRequest request) {
  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
  DCHECK(ref_factory_);
  if (!system_info_) {
    DVLOG(4)
        << "audio::Service::BindSystemInfoRequest: lazy SystemInfo creation";
    system_info_ = std::make_unique<SystemInfo>(
        audio_manager_accessor_->GetAudioManager());
  }
  system_info_->Bind(std::move(request), ref_factory_->CreateRef());
}

void Service::BindDebugRecordingRequest(mojom::DebugRecordingRequest request) {
  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
  DCHECK(ref_factory_);
  // Accept only one bind request at a time. Old request is overwritten.
  // |debug_recording_| must be reset first to disable debug recording, and then
  // create a new DebugRecording instance to enable debug recording.
  debug_recording_.reset();
  debug_recording_ = std::make_unique<DebugRecording>(
      std::move(request), audio_manager_accessor_->GetAudioManager(),
      ref_factory_->CreateRef());
}

void Service::BindStreamFactoryRequest(mojom::StreamFactoryRequest request) {
  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
  DCHECK(ref_factory_);
  if (!stream_factory_)
    stream_factory_.emplace(audio_manager_accessor_->GetAudioManager());
  stream_factory_->Bind(std::move(request), ref_factory_->CreateRef());
}

void Service::MaybeRequestQuitDelayed() {
  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
  if (quit_timeout_ <= base::TimeDelta())
    return;
  quit_timer_.Start(FROM_HERE, quit_timeout_, this, &Service::MaybeRequestQuit);
}

void Service::MaybeRequestQuit() {
  DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
  DCHECK(ref_factory_ && ref_factory_->HasNoRefs() &&
         quit_timeout_ > base::TimeDelta());
  context()->CreateQuitClosure().Run();
  if (!quit_closure_.is_null())
    quit_closure_.Run();
}

}  // namespace audio