// Copyright 2014 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 "chromeos/dbus/fake_bluetooth_gatt_service_client.h"

#include "base/bind.h"
#include "base/location.h"
#include "base/single_thread_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "base/time/time.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#include "chromeos/dbus/fake_bluetooth_gatt_characteristic_client.h"
#include "third_party/cros_system_api/dbus/service_constants.h"

namespace chromeos {

namespace {

const int kExposeCharacteristicsDelayIntervalMs = 100;

}  // namespace

// static
const char FakeBluetoothGattServiceClient::kHeartRateServicePathComponent[] =
    "service0000";
const char FakeBluetoothGattServiceClient::kHeartRateServiceUUID[] =
    "0000180d-0000-1000-8000-00805f9b34fb";

FakeBluetoothGattServiceClient::Properties::Properties(
    const PropertyChangedCallback& callback)
    : BluetoothGattServiceClient::Properties(
        NULL,
        bluetooth_gatt_service::kBluetoothGattServiceInterface,
        callback) {
}

FakeBluetoothGattServiceClient::Properties::~Properties() {
}

void FakeBluetoothGattServiceClient::Properties::Get(
    dbus::PropertyBase* property,
    dbus::PropertySet::GetCallback callback) {
  VLOG(1) << "Get " << property->name();
  callback.Run(false);
}

void FakeBluetoothGattServiceClient::Properties::GetAll() {
  VLOG(1) << "GetAll";
}

void FakeBluetoothGattServiceClient::Properties::Set(
    dbus::PropertyBase* property,
    dbus::PropertySet::GetCallback callback) {
  VLOG(1) << "Set " << property->name();
  callback.Run(false);
}

FakeBluetoothGattServiceClient::FakeBluetoothGattServiceClient()
    : weak_ptr_factory_(this) {
}

FakeBluetoothGattServiceClient::~FakeBluetoothGattServiceClient() {
}

void FakeBluetoothGattServiceClient::Init(dbus::Bus* bus) {
}

void FakeBluetoothGattServiceClient::AddObserver(Observer* observer) {
  observers_.AddObserver(observer);
}

void FakeBluetoothGattServiceClient::RemoveObserver(Observer* observer) {
  observers_.RemoveObserver(observer);
}

std::vector<dbus::ObjectPath> FakeBluetoothGattServiceClient::GetServices() {
  std::vector<dbus::ObjectPath> paths;
  if (heart_rate_service_properties_.get()) {
    DCHECK(!heart_rate_service_path_.empty());
    paths.push_back(dbus::ObjectPath(heart_rate_service_path_));
  }
  return paths;
}

FakeBluetoothGattServiceClient::Properties*
FakeBluetoothGattServiceClient::GetProperties(
    const dbus::ObjectPath& object_path) {
  if (object_path.value() == heart_rate_service_path_)
    return heart_rate_service_properties_.get();
  return NULL;
}

void FakeBluetoothGattServiceClient::ExposeHeartRateService(
    const dbus::ObjectPath& device_path) {
  if (IsHeartRateVisible()) {
    DCHECK(!heart_rate_service_path_.empty());
    VLOG(1) << "Fake Heart Rate Service already exposed.";
    return;
  }
  VLOG(2) << "Exposing fake Heart Rate Service.";
  heart_rate_service_path_ =
      device_path.value() + "/" + kHeartRateServicePathComponent;
  heart_rate_service_properties_.reset(new Properties(base::Bind(
      &FakeBluetoothGattServiceClient::OnPropertyChanged,
      base::Unretained(this),
      dbus::ObjectPath(heart_rate_service_path_))));
  heart_rate_service_properties_->uuid.ReplaceValue(kHeartRateServiceUUID);
  heart_rate_service_properties_->device.ReplaceValue(device_path);
  heart_rate_service_properties_->primary.ReplaceValue(true);

  NotifyServiceAdded(dbus::ObjectPath(heart_rate_service_path_));

  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
      FROM_HERE,
      base::Bind(
          &FakeBluetoothGattServiceClient::ExposeHeartRateCharacteristics,
          weak_ptr_factory_.GetWeakPtr()),
      base::TimeDelta::FromMilliseconds(kExposeCharacteristicsDelayIntervalMs));
}

void FakeBluetoothGattServiceClient::HideHeartRateService() {
  if (!IsHeartRateVisible()) {
    DCHECK(heart_rate_service_path_.empty());
    VLOG(1) << "Fake Heart Rate Service already hidden.";
    return;
  }
  VLOG(2) << "Hiding fake Heart Rate Service.";
  FakeBluetoothGattCharacteristicClient* char_client =
      static_cast<FakeBluetoothGattCharacteristicClient*>(
          DBusThreadManager::Get()->GetBluetoothGattCharacteristicClient());
  char_client->HideHeartRateCharacteristics();

  // Notify observers before deleting the properties structure so that it
  // can be accessed from the observer method.
  NotifyServiceRemoved(dbus::ObjectPath(heart_rate_service_path_));

  heart_rate_service_properties_.reset();
  heart_rate_service_path_.clear();
}

bool FakeBluetoothGattServiceClient::IsHeartRateVisible() const {
  return !!heart_rate_service_properties_.get();
}

dbus::ObjectPath
FakeBluetoothGattServiceClient::GetHeartRateServicePath() const {
  return dbus::ObjectPath(heart_rate_service_path_);
}

void FakeBluetoothGattServiceClient::OnPropertyChanged(
    const dbus::ObjectPath& object_path,
    const std::string& property_name) {
  VLOG(2) << "Fake GATT Service property changed: " << object_path.value()
          << ": " << property_name;
  FOR_EACH_OBSERVER(BluetoothGattServiceClient::Observer, observers_,
                    GattServicePropertyChanged(object_path, property_name));
}

void FakeBluetoothGattServiceClient::NotifyServiceAdded(
    const dbus::ObjectPath& object_path) {
  VLOG(2) << "GATT service added: " << object_path.value();
  FOR_EACH_OBSERVER(
      BluetoothGattServiceClient::Observer, observers_,
      GattServiceAdded(object_path));
}

void FakeBluetoothGattServiceClient::NotifyServiceRemoved(
    const dbus::ObjectPath& object_path) {
  VLOG(2) << "GATT service removed: " << object_path.value();
  FOR_EACH_OBSERVER(
      BluetoothGattServiceClient::Observer, observers_,
      GattServiceRemoved(object_path));
}

void FakeBluetoothGattServiceClient::ExposeHeartRateCharacteristics() {
  if (!IsHeartRateVisible()) {
    VLOG(2) << "Heart Rate service not visible. Not exposing characteristics.";
    return;
  }
  FakeBluetoothGattCharacteristicClient* char_client =
      static_cast<FakeBluetoothGattCharacteristicClient*>(
          DBusThreadManager::Get()->GetBluetoothGattCharacteristicClient());
  char_client->ExposeHeartRateCharacteristics(
      dbus::ObjectPath(heart_rate_service_path_));

  std::vector<dbus::ObjectPath> char_paths;
  char_paths.push_back(char_client->GetHeartRateMeasurementPath());
  char_paths.push_back(char_client->GetBodySensorLocationPath());
  char_paths.push_back(char_client->GetHeartRateControlPointPath());

  heart_rate_service_properties_->characteristics.ReplaceValue(char_paths);
}

}  // namespace chromeos