// Copyright 2013 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/bluetooth_device_client.h"

#include "base/bind.h"
#include "base/logging.h"
#include "base/stl_util.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 chromeos {

namespace {

// Value returned for the the RSSI or TX power if it cannot be read.
const int kUnknownPower = 127;

}  // namespace

const char BluetoothDeviceClient::kNoResponseError[] =
    "org.chromium.Error.NoResponse";
const char BluetoothDeviceClient::kUnknownDeviceError[] =
    "org.chromium.Error.UnknownDevice";

BluetoothDeviceClient::Properties::Properties(
    dbus::ObjectProxy* object_proxy,
    const std::string& interface_name,
    const PropertyChangedCallback& callback)
    : dbus::PropertySet(object_proxy, interface_name, callback) {
  RegisterProperty(bluetooth_device::kAddressProperty, &address);
  RegisterProperty(bluetooth_device::kNameProperty, &name);
  RegisterProperty(bluetooth_device::kIconProperty, &icon);
  RegisterProperty(bluetooth_device::kClassProperty, &bluetooth_class);
  RegisterProperty(bluetooth_device::kAppearanceProperty, &appearance);
  RegisterProperty(bluetooth_device::kUUIDsProperty, &uuids);
  RegisterProperty(bluetooth_device::kPairedProperty, &paired);
  RegisterProperty(bluetooth_device::kConnectedProperty, &connected);
  RegisterProperty(bluetooth_device::kTrustedProperty, &trusted);
  RegisterProperty(bluetooth_device::kBlockedProperty, &blocked);
  RegisterProperty(bluetooth_device::kAliasProperty, &alias);
  RegisterProperty(bluetooth_device::kAdapterProperty, &adapter);
  RegisterProperty(bluetooth_device::kLegacyPairingProperty, &legacy_pairing);
  RegisterProperty(bluetooth_device::kModaliasProperty, &modalias);
  RegisterProperty(bluetooth_device::kRSSIProperty, &rssi);
  RegisterProperty(bluetooth_device::kTxPowerProperty, &tx_power);
}

BluetoothDeviceClient::Properties::~Properties() {
}


// The BluetoothDeviceClient implementation used in production.
class BluetoothDeviceClientImpl
    : public BluetoothDeviceClient,
      public dbus::ObjectManager::Interface {
 public:
  BluetoothDeviceClientImpl()
      : object_manager_(NULL), weak_ptr_factory_(this) {}

  ~BluetoothDeviceClientImpl() override {
    object_manager_->UnregisterInterface(
        bluetooth_device::kBluetoothDeviceInterface);
  }

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

  // BluetoothDeviceClient override.
  void RemoveObserver(BluetoothDeviceClient::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 {
    Properties* properties = new Properties(
        object_proxy,
        interface_name,
        base::Bind(&BluetoothDeviceClientImpl::OnPropertyChanged,
                   weak_ptr_factory_.GetWeakPtr(),
                   object_path));
    return static_cast<dbus::PropertySet*>(properties);
  }

  // BluetoothDeviceClient override.
  std::vector<dbus::ObjectPath> GetDevicesForAdapter(
      const dbus::ObjectPath& adapter_path) override {
    std::vector<dbus::ObjectPath> object_paths, device_paths;
    device_paths = object_manager_->GetObjectsWithInterface(
        bluetooth_device::kBluetoothDeviceInterface);
    for (std::vector<dbus::ObjectPath>::iterator iter = device_paths.begin();
         iter != device_paths.end(); ++iter) {
      Properties* properties = GetProperties(*iter);
      if (properties->adapter.value() == adapter_path)
        object_paths.push_back(*iter);
    }
    return object_paths;
  }

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

  // BluetoothDeviceClient override.
  void Connect(const dbus::ObjectPath& object_path,
               const base::Closure& callback,
               const ErrorCallback& error_callback) override {
    dbus::MethodCall method_call(
        bluetooth_device::kBluetoothDeviceInterface,
        bluetooth_device::kConnect);

    dbus::ObjectProxy* object_proxy =
        object_manager_->GetObjectProxy(object_path);
    if (!object_proxy) {
      error_callback.Run(kUnknownDeviceError, "");
      return;
    }

    // Connect may take an arbitrary length of time, so use no timeout.
    object_proxy->CallMethodWithErrorCallback(
        &method_call,
        dbus::ObjectProxy::TIMEOUT_INFINITE,
        base::Bind(&BluetoothDeviceClientImpl::OnSuccess,
                   weak_ptr_factory_.GetWeakPtr(), callback),
        base::Bind(&BluetoothDeviceClientImpl::OnError,
                   weak_ptr_factory_.GetWeakPtr(), error_callback));
  }

  // BluetoothDeviceClient override.
  void Disconnect(const dbus::ObjectPath& object_path,
                  const base::Closure& callback,
                  const ErrorCallback& error_callback) override {
    dbus::MethodCall method_call(
        bluetooth_device::kBluetoothDeviceInterface,
        bluetooth_device::kDisconnect);

    dbus::ObjectProxy* object_proxy =
        object_manager_->GetObjectProxy(object_path);
    if (!object_proxy) {
      error_callback.Run(kUnknownDeviceError, "");
      return;
    }

    object_proxy->CallMethodWithErrorCallback(
        &method_call,
        dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
        base::Bind(&BluetoothDeviceClientImpl::OnSuccess,
                   weak_ptr_factory_.GetWeakPtr(), callback),
        base::Bind(&BluetoothDeviceClientImpl::OnError,
                   weak_ptr_factory_.GetWeakPtr(), error_callback));
  }

  // BluetoothDeviceClient override.
  void ConnectProfile(const dbus::ObjectPath& object_path,
                      const std::string& uuid,
                      const base::Closure& callback,
                      const ErrorCallback& error_callback) override {
    dbus::MethodCall method_call(
        bluetooth_device::kBluetoothDeviceInterface,
        bluetooth_device::kConnectProfile);

    dbus::MessageWriter writer(&method_call);
    writer.AppendString(uuid);

    dbus::ObjectProxy* object_proxy =
        object_manager_->GetObjectProxy(object_path);
    if (!object_proxy) {
      error_callback.Run(kUnknownDeviceError, "");
      return;
    }

    // Connect may take an arbitrary length of time, so use no timeout.
    object_proxy->CallMethodWithErrorCallback(
        &method_call,
        dbus::ObjectProxy::TIMEOUT_INFINITE,
        base::Bind(&BluetoothDeviceClientImpl::OnSuccess,
                   weak_ptr_factory_.GetWeakPtr(), callback),
        base::Bind(&BluetoothDeviceClientImpl::OnError,
                   weak_ptr_factory_.GetWeakPtr(), error_callback));
  }

  // BluetoothDeviceClient override.
  void DisconnectProfile(const dbus::ObjectPath& object_path,
                         const std::string& uuid,
                         const base::Closure& callback,
                         const ErrorCallback& error_callback) override {
    dbus::MethodCall method_call(
        bluetooth_device::kBluetoothDeviceInterface,
        bluetooth_device::kDisconnectProfile);

    dbus::MessageWriter writer(&method_call);
    writer.AppendString(uuid);

    dbus::ObjectProxy* object_proxy =
        object_manager_->GetObjectProxy(object_path);
    if (!object_proxy) {
      error_callback.Run(kUnknownDeviceError, "");
      return;
    }

    object_proxy->CallMethodWithErrorCallback(
        &method_call,
        dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
        base::Bind(&BluetoothDeviceClientImpl::OnSuccess,
                   weak_ptr_factory_.GetWeakPtr(), callback),
        base::Bind(&BluetoothDeviceClientImpl::OnError,
                   weak_ptr_factory_.GetWeakPtr(), error_callback));
  }

  // BluetoothDeviceClient override.
  void Pair(const dbus::ObjectPath& object_path,
            const base::Closure& callback,
            const ErrorCallback& error_callback) override {
    dbus::MethodCall method_call(
        bluetooth_device::kBluetoothDeviceInterface,
        bluetooth_device::kPair);

    dbus::ObjectProxy* object_proxy =
        object_manager_->GetObjectProxy(object_path);
    if (!object_proxy) {
      error_callback.Run(kUnknownDeviceError, "");
      return;
    }

    // Pairing may take an arbitrary length of time, so use no timeout.
    object_proxy->CallMethodWithErrorCallback(
        &method_call,
        dbus::ObjectProxy::TIMEOUT_INFINITE,
        base::Bind(&BluetoothDeviceClientImpl::OnSuccess,
                   weak_ptr_factory_.GetWeakPtr(), callback),
        base::Bind(&BluetoothDeviceClientImpl::OnError,
                   weak_ptr_factory_.GetWeakPtr(), error_callback));
  }

  // BluetoothDeviceClient override.
  void CancelPairing(const dbus::ObjectPath& object_path,
                     const base::Closure& callback,
                     const ErrorCallback& error_callback) override {
    dbus::MethodCall method_call(
        bluetooth_device::kBluetoothDeviceInterface,
        bluetooth_device::kCancelPairing);

    dbus::ObjectProxy* object_proxy =
        object_manager_->GetObjectProxy(object_path);
    if (!object_proxy) {
      error_callback.Run(kUnknownDeviceError, "");
      return;
    }
    object_proxy->CallMethodWithErrorCallback(
        &method_call,
        dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
        base::Bind(&BluetoothDeviceClientImpl::OnSuccess,
                   weak_ptr_factory_.GetWeakPtr(), callback),
        base::Bind(&BluetoothDeviceClientImpl::OnError,
                   weak_ptr_factory_.GetWeakPtr(), error_callback));
  }

  // BluetoothDeviceClient override.
  void GetConnInfo(const dbus::ObjectPath& object_path,
                   const ConnInfoCallback& callback,
                   const ErrorCallback& error_callback) override {
    dbus::MethodCall method_call(
        bluetooth_plugin_device::kBluetoothPluginInterface,
        bluetooth_plugin_device::kGetConnInfo);

    dbus::ObjectProxy* object_proxy =
        object_manager_->GetObjectProxy(object_path);
    if (!object_proxy) {
      error_callback.Run(kUnknownDeviceError, "");
      return;
    }
    object_proxy->CallMethodWithErrorCallback(
        &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
        base::Bind(&BluetoothDeviceClientImpl::OnGetConnInfoSuccess,
                   weak_ptr_factory_.GetWeakPtr(), callback),
        base::Bind(&BluetoothDeviceClientImpl::OnError,
                   weak_ptr_factory_.GetWeakPtr(), error_callback));
  }

 protected:
  void Init(dbus::Bus* bus) override {
    object_manager_ = bus->GetObjectManager(
        bluetooth_object_manager::kBluetoothObjectManagerServiceName,
        dbus::ObjectPath(
            bluetooth_object_manager::kBluetoothObjectManagerServicePath));
    object_manager_->RegisterInterface(
        bluetooth_device::kBluetoothDeviceInterface, this);
  }

 private:
  // Called by dbus::ObjectManager when an object with the device interface
  // is created. Informs observers.
  void ObjectAdded(const dbus::ObjectPath& object_path,
                   const std::string& interface_name) override {
    FOR_EACH_OBSERVER(BluetoothDeviceClient::Observer, observers_,
                      DeviceAdded(object_path));
  }

  // Called by dbus::ObjectManager when an object with the device interface
  // is removed. Informs observers.
  void ObjectRemoved(const dbus::ObjectPath& object_path,
                     const std::string& interface_name) override {
    FOR_EACH_OBSERVER(BluetoothDeviceClient::Observer, observers_,
                      DeviceRemoved(object_path));
  }

  // Called by BluetoothPropertySet when a property value is changed,
  // either by result of a signal or response to a GetAll() or Get()
  // call. Informs observers.
  void OnPropertyChanged(const dbus::ObjectPath& object_path,
                         const std::string& property_name) {
    FOR_EACH_OBSERVER(BluetoothDeviceClient::Observer, observers_,
                      DevicePropertyChanged(object_path, property_name));
  }

  // Called when a response for successful method call is received.
  void OnSuccess(const base::Closure& callback,
                 dbus::Response* response) {
    DCHECK(response);
    callback.Run();
  }

  // Called when a response for the GetConnInfo method is received.
  void OnGetConnInfoSuccess(const ConnInfoCallback& callback,
                            dbus::Response* response) {
    int16 rssi = kUnknownPower;
    int16 transmit_power = kUnknownPower;
    int16 max_transmit_power = kUnknownPower;

    if (!response) {
      LOG(ERROR) << "GetConnInfo succeeded, but no response received.";
      callback.Run(rssi, transmit_power, max_transmit_power);
      return;
    }

    dbus::MessageReader reader(response);
    if (!reader.PopInt16(&rssi) || !reader.PopInt16(&transmit_power) ||
        !reader.PopInt16(&max_transmit_power)) {
      LOG(ERROR) << "Arguments for GetConnInfo invalid.";
    }
    callback.Run(rssi, transmit_power, max_transmit_power);
  }

  // Called when a response for a failed method call is received.
  void OnError(const ErrorCallback& error_callback,
               dbus::ErrorResponse* response) {
    // Error response has optional error message argument.
    std::string error_name;
    std::string error_message;
    if (response) {
      dbus::MessageReader reader(response);
      error_name = response->GetErrorName();
      reader.PopString(&error_message);
    } else {
      error_name = kNoResponseError;
      error_message = "";
    }
    error_callback.Run(error_name, error_message);
  }

  dbus::ObjectManager* object_manager_;

  // List of observers interested in event notifications from us.
  base::ObserverList<BluetoothDeviceClient::Observer> 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<BluetoothDeviceClientImpl> weak_ptr_factory_;

  DISALLOW_COPY_AND_ASSIGN(BluetoothDeviceClientImpl);
};

BluetoothDeviceClient::BluetoothDeviceClient() {
}

BluetoothDeviceClient::~BluetoothDeviceClient() {
}

BluetoothDeviceClient* BluetoothDeviceClient::Create() {
  return new BluetoothDeviceClientImpl();
}

}  // namespace chromeos