// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "device/bluetooth/dbus/bluetooth_le_advertising_manager_client.h"

#include "base/check.h"
#include "base/functional/bind.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_manager.h"
#include "dbus/object_proxy.h"
#include "third_party/cros_system_api/dbus/service_constants.h"

namespace bluez {

BluetoothLEAdvertisingManagerClient::Properties::Properties(
    dbus::ObjectProxy* object_proxy,
    const std::string& interface_name,
    const PropertyChangedCallback& callback)
    : dbus::PropertySet(object_proxy, interface_name, callback) {
  RegisterProperty(bluetooth_advertising_manager::kSupportedFeatures,
                   &supported_features);
}

BluetoothLEAdvertisingManagerClient::Properties::~Properties() = default;

const char BluetoothLEAdvertisingManagerClient::kNoResponseError[] =
    "org.chromium.Error.NoResponse";

// The BluetoothAdvertisementManagerClient implementation used in production.
class BluetoothAdvertisementManagerClientImpl
    : public BluetoothLEAdvertisingManagerClient,
      public dbus::ObjectManager::Interface {
 public:
  BluetoothAdvertisementManagerClientImpl() : object_manager_(nullptr) {}

  BluetoothAdvertisementManagerClientImpl(
      const BluetoothAdvertisementManagerClientImpl&) = delete;
  BluetoothAdvertisementManagerClientImpl& operator=(
      const BluetoothAdvertisementManagerClientImpl&) = delete;

  ~BluetoothAdvertisementManagerClientImpl() override {
    if (object_manager_) {
      object_manager_->UnregisterInterface(
          bluetooth_advertising_manager::kBluetoothAdvertisingManagerInterface);
    }
  }

  // BluetoothAdapterClient override.
  void AddObserver(
      BluetoothLEAdvertisingManagerClient::Observer* observer) override {
    DCHECK(observer);
    observers_.AddObserver(observer);
  }

  // BluetoothAdapterClient override.
  void RemoveObserver(
      BluetoothLEAdvertisingManagerClient::Observer* observer) override {
    DCHECK(observer);
    observers_.RemoveObserver(observer);
  }

  // dbus::ObjectManager::Interface override.
  dbus::PropertySet* CreateProperties(
      dbus::ObjectProxy* object_proxy,
      const dbus::ObjectPath& object_path,
      const std::string& interface_name) override {
    return new Properties(object_proxy, interface_name, base::DoNothing());
  }

  // BluetoothAdvertisementManagerClient override.
  Properties* GetProperties(const dbus::ObjectPath& object_path) override {
    return static_cast<Properties*>(object_manager_->GetProperties(
        object_path,
        bluetooth_advertising_manager::kBluetoothAdvertisingManagerInterface));
  }

  // BluetoothAdvertisementManagerClient override.
  void RegisterAdvertisement(const dbus::ObjectPath& manager_object_path,
                             const dbus::ObjectPath& advertisement_object_path,
                             base::OnceClosure callback,
                             ErrorCallback error_callback) override {
    dbus::MethodCall method_call(
        bluetooth_advertising_manager::kBluetoothAdvertisingManagerInterface,
        bluetooth_advertising_manager::kRegisterAdvertisement);

    dbus::MessageWriter writer(&method_call);
    writer.AppendObjectPath(advertisement_object_path);

    // Empty dictionary for options.
    dbus::MessageWriter array_writer(NULL);
    writer.OpenArray("{sv}", &array_writer);
    writer.CloseContainer(&array_writer);

    CallObjectProxyMethod(manager_object_path, &method_call,
                          std::move(callback), std::move(error_callback));
  }

  // BluetoothAdvertisementManagerClient override.
  void UnregisterAdvertisement(
      const dbus::ObjectPath& manager_object_path,
      const dbus::ObjectPath& advertisement_object_path,
      base::OnceClosure callback,
      ErrorCallback error_callback) override {
    dbus::MethodCall method_call(
        bluetooth_advertising_manager::kBluetoothAdvertisingManagerInterface,
        bluetooth_advertising_manager::kUnregisterAdvertisement);

    dbus::MessageWriter writer(&method_call);
    writer.AppendObjectPath(advertisement_object_path);

    CallObjectProxyMethod(manager_object_path, &method_call,
                          std::move(callback), std::move(error_callback));
  }

  void SetAdvertisingInterval(const dbus::ObjectPath& manager_object_path,
                              uint16_t min_interval_ms,
                              uint16_t max_interval_ms,
                              base::OnceClosure callback,
                              ErrorCallback error_callback) override {
    dbus::MethodCall method_call(
        bluetooth_advertising_manager::kBluetoothAdvertisingManagerInterface,
        bluetooth_advertising_manager::kSetAdvertisingIntervals);

    dbus::MessageWriter writer(&method_call);
    writer.AppendUint16(min_interval_ms);
    writer.AppendUint16(max_interval_ms);

    CallObjectProxyMethod(manager_object_path, &method_call,
                          std::move(callback), std::move(error_callback));
  }

  void ResetAdvertising(const dbus::ObjectPath& manager_object_path,
                        base::OnceClosure callback,
                        ErrorCallback error_callback) override {
    dbus::MethodCall method_call(
        bluetooth_advertising_manager::kBluetoothAdvertisingManagerInterface,
        bluetooth_advertising_manager::kResetAdvertising);

    CallObjectProxyMethod(manager_object_path, &method_call,
                          std::move(callback), std::move(error_callback));
  }

 protected:
  void Init(dbus::Bus* bus,
            const std::string& bluetooth_service_name) override {
    DCHECK(bus);
    object_manager_ = bus->GetObjectManager(
        bluetooth_service_name,
        dbus::ObjectPath(
            bluetooth_object_manager::kBluetoothObjectManagerServicePath));
    object_manager_->RegisterInterface(
        bluetooth_advertising_manager::kBluetoothAdvertisingManagerInterface,
        this);
  }

 private:
  // Unified function to call object proxy method. This includes checking
  // if the bluetooth adapter exists and run error callback if it doesn't.
  void CallObjectProxyMethod(const dbus::ObjectPath& manager_object_path,
                             dbus::MethodCall* method_call,
                             base::OnceClosure callback,
                             ErrorCallback error_callback) {
    DCHECK(object_manager_);
    dbus::ObjectProxy* object_proxy =
        object_manager_->GetObjectProxy(manager_object_path);
    if (!object_proxy) {
      std::move(error_callback)
          .Run(bluetooth_advertising_manager::kErrorFailed,
               "Adapter does not exist.");
      return;
    }

    object_proxy->CallMethodWithErrorResponse(
        method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
        base::BindOnce(
            &BluetoothAdvertisementManagerClientImpl::OnMethodResponse,
            weak_ptr_factory_.GetWeakPtr(), std::move(callback),
            std::move(error_callback)));
  }

  // Called by dbus::ObjectManager when an object with the advertising manager
  // interface is created. Informs observers.
  void ObjectAdded(const dbus::ObjectPath& object_path,
                   const std::string& interface_name) override {
    for (auto& observer : observers_)
      observer.AdvertisingManagerAdded(object_path);
  }

  // Called by dbus::ObjectManager when an object with the advertising manager
  // interface is removed. Informs observers.
  void ObjectRemoved(const dbus::ObjectPath& object_path,
                     const std::string& interface_name) override {
    for (auto& observer : observers_)
      observer.AdvertisingManagerRemoved(object_path);
  }

  void OnMethodResponse(base::OnceClosure callback,
                        ErrorCallback error_callback,
                        dbus::Response* response,
                        dbus::ErrorResponse* error_response) {
    if (!response) {
      std::string error_name;
      std::string error_message;
      if (error_response) {
        dbus::MessageReader reader(error_response);
        error_name = error_response->GetErrorName();
        reader.PopString(&error_message);
      } else {
        error_name = kNoResponseError;
      }
      std::move(error_callback).Run(error_name, error_message);
      return;
    }

    std::move(callback).Run();
  }

  raw_ptr<dbus::ObjectManager> object_manager_;

  // List of observers interested in event notifications from us.
  base::ObserverList<BluetoothLEAdvertisingManagerClient::Observer>::Unchecked
      observers_;

  // Weak pointer factory for generating 'this' pointers that might live longer
  // than we do.
  // Note: This should remain the last member so it'll be destroyed and
  // invalidate its weak pointers before any other members are destroyed.
  base::WeakPtrFactory<BluetoothAdvertisementManagerClientImpl>
      weak_ptr_factory_{this};
};

BluetoothLEAdvertisingManagerClient::BluetoothLEAdvertisingManagerClient() =
    default;

BluetoothLEAdvertisingManagerClient::~BluetoothLEAdvertisingManagerClient() =
    default;

BluetoothLEAdvertisingManagerClient*
BluetoothLEAdvertisingManagerClient::Create() {
  return new BluetoothAdvertisementManagerClientImpl();
}

}  // namespace bluez