// 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/bluetooth_media_client.h"

#include "base/bind.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_proxy.h"

namespace {

// TODO(mcchou): Add these service constants into dbus/service_constants.h
// later.
const char kBluetoothMediaServiceName[] = "org.bluez";
const char kBluetoothMediaInterface[] = "org.bluez.Media1";

// Method names supported by Media Interface.
const char kRegisterEndpoint[] = "RegisterEndpoint";
const char kUnregisterEndpoint[] = "UnregisterEndpoint";

// The set of properties which are used to register a media endpoint.
const char kUUIDEndpointProperty[] = "UUID";
const char kCodecEndpointProperty[] = "Codec";
const char kCapabilitiesEndpointProperty[] = "Capabilities";

}  // namespace

namespace chromeos {

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

BluetoothMediaClient::EndpointProperties::EndpointProperties() : codec(0x00) {
}

BluetoothMediaClient::EndpointProperties::~EndpointProperties() {
}

class BluetoothMediaClientImpl : public BluetoothMediaClient {
 public:
  BluetoothMediaClientImpl() : bus_(nullptr), weak_ptr_factory_(this) {}

  ~BluetoothMediaClientImpl() override {}

  void RegisterEndpoint(const dbus::ObjectPath& object_path,
                        const dbus::ObjectPath& endpoint_path,
                        const EndpointProperties& properties,
                        const base::Closure& callback,
                        const ErrorCallback& error_callback) override {
    dbus::MethodCall method_call(kBluetoothMediaInterface, kRegisterEndpoint);

    dbus::MessageWriter writer(&method_call);
    dbus::MessageWriter array_writer(nullptr);
    dbus::MessageWriter dict_entry_writer(nullptr);

    // Send the path to the endpoint.
    writer.AppendObjectPath(endpoint_path);

    writer.OpenArray("{sv}", &array_writer);

    // Send UUID.
    array_writer.OpenDictEntry(&dict_entry_writer);
    dict_entry_writer.AppendString(kUUIDEndpointProperty);
    dict_entry_writer.AppendVariantOfString(properties.uuid);
    array_writer.CloseContainer(&dict_entry_writer);

    // Send Codec.
    array_writer.OpenDictEntry(&dict_entry_writer);
    dict_entry_writer.AppendString(kCodecEndpointProperty);
    dict_entry_writer.AppendVariantOfByte(properties.codec);
    array_writer.CloseContainer(&dict_entry_writer);

    // Send Capabilities.
    dbus::MessageWriter variant_writer(nullptr);
    array_writer.OpenDictEntry(&dict_entry_writer);
    dict_entry_writer.AppendString(kCapabilitiesEndpointProperty);
    dict_entry_writer.OpenVariant("ay", &variant_writer);
    variant_writer.AppendArrayOfBytes(properties.capabilities.data(),
                                      properties.capabilities.size());
    dict_entry_writer.CloseContainer(&variant_writer);
    array_writer.CloseContainer(&dict_entry_writer);

    writer.CloseContainer(&array_writer);

    // Get Object Proxy based on the service name and the service path and call
    // RegisterEndpoint medthod.
    scoped_refptr<dbus::ObjectProxy> proxy(
        bus_->GetObjectProxy(kBluetoothMediaServiceName, object_path));
    proxy->CallMethodWithErrorCallback(
        &method_call,
        dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
        base::Bind(&BluetoothMediaClientImpl::OnSuccess,
                   weak_ptr_factory_.GetWeakPtr(), callback),
        base::Bind(&BluetoothMediaClientImpl::OnError,
                   weak_ptr_factory_.GetWeakPtr(), error_callback));
  }

  void UnregisterEndpoint(const dbus::ObjectPath& object_path,
                          const dbus::ObjectPath& endpoint_path,
                          const base::Closure& callback,
                          const ErrorCallback& error_callback) override {
    dbus::MethodCall method_call(kBluetoothMediaInterface, kUnregisterEndpoint);

    // Send the path to the endpoint.
    dbus::MessageWriter writer(&method_call);
    writer.AppendObjectPath(endpoint_path);

    // Get Object Proxy based on the service name and the service path and call
    // RegisterEndpoint medthod.
    scoped_refptr<dbus::ObjectProxy> object_proxy(
        bus_->GetObjectProxy(kBluetoothMediaServiceName, object_path));
    object_proxy->CallMethodWithErrorCallback(
        &method_call,
        dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
        base::Bind(&BluetoothMediaClientImpl::OnSuccess,
                   weak_ptr_factory_.GetWeakPtr(), callback),
        base::Bind(&BluetoothMediaClientImpl::OnError,
                   weak_ptr_factory_.GetWeakPtr(), error_callback));
  }

 protected:
  void Init(dbus::Bus* bus) override {
    DCHECK(bus);
    bus_ = bus;
  }

 private:
  // 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 a failed method call is received.
  void OnError(const ErrorCallback& error_callback,
               dbus::ErrorResponse* response) {
    // Error response has an 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_callback.Run(error_name, error_message);
  }

  dbus::Bus* bus_;

  base::WeakPtrFactory<BluetoothMediaClientImpl> weak_ptr_factory_;

  DISALLOW_COPY_AND_ASSIGN(BluetoothMediaClientImpl);
};

BluetoothMediaClient::BluetoothMediaClient() {
}

BluetoothMediaClient::~BluetoothMediaClient() {
}

BluetoothMediaClient* BluetoothMediaClient::Create() {
  return new BluetoothMediaClientImpl();
}

}  // namespace chromeos