// Copyright 2018 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_factory.h"

#include <string>
#include <utility>

#include "base/bind.h"
#include "base/command_line.h"
#include "base/metrics/field_trial_params.h"
#include "base/optional.h"
#include "base/strings/string_number_conversions.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "media/audio/audio_manager.h"
#include "media/base/media_switches.h"
#include "services/audio/in_process_audio_manager_accessor.h"
#include "services/audio/owning_audio_manager_accessor.h"
#include "services/audio/service.h"

namespace audio {

namespace {

base::Optional<base::TimeDelta> GetExperimentalQuitTimeout() {
  std::string timeout_str(
      base::GetFieldTrialParamValue("AudioService", "teardown_timeout_s"));
  int timeout_s = 0;
  if (!base::StringToInt(timeout_str, &timeout_s))
    return base::nullopt;  // Ill-formed value provided, fall back to default.
  return base::TimeDelta::FromSeconds(timeout_s);
}

base::Optional<base::TimeDelta> GetCommandLineQuitTimeout() {
  const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
  if (!cmd_line->HasSwitch(switches::kAudioServiceQuitTimeoutMs))
    return base::nullopt;
  std::string timeout_str(
      cmd_line->GetSwitchValueASCII(switches::kAudioServiceQuitTimeoutMs));
  int timeout_ms = 0;
  if (!base::StringToInt(timeout_str, &timeout_ms))
    return base::nullopt;  // Ill-formed value provided, fall back to default.
  return base::TimeDelta::FromMilliseconds(timeout_ms);
}

base::Optional<base::TimeDelta> GetQuitTimeout() {
  if (auto timeout = GetCommandLineQuitTimeout())
    return *timeout >= base::TimeDelta() ? timeout : base::nullopt;

  if (auto timeout = GetExperimentalQuitTimeout())
    return *timeout >= base::TimeDelta() ? timeout : base::nullopt;

  // Default timeout.
  return base::TimeDelta::FromMinutes(15);
}

}  // namespace

std::unique_ptr<Service> CreateEmbeddedService(
    media::AudioManager* audio_manager,
    mojo::PendingReceiver<service_manager::mojom::Service> receiver) {
  return std::make_unique<Service>(
      std::make_unique<InProcessAudioManagerAccessor>(audio_manager),
      base::nullopt /* do not quit if all clients disconnected */,
      false /* enable_device_notifications */,
      std::make_unique<service_manager::BinderMap>(), std::move(receiver));
}

std::unique_ptr<Service> CreateStandaloneService(
    std::unique_ptr<service_manager::BinderMap> extra_binders,
    mojo::PendingReceiver<service_manager::mojom::Service> receiver) {
  return std::make_unique<Service>(
      std::make_unique<audio::OwningAudioManagerAccessor>(
          base::BindOnce(&media::AudioManager::Create)),
      GetQuitTimeout(), true /* enable_remote_client_support */,
      std::move(extra_binders), std::move(receiver));
}

}  // namespace audio