// DialGRPC returns a GRPC connection for use communicating with a Google cloud
// service, configured with the given ClientOptions.
func DialGRPC(ctx context.Context, opt ...cloud.ClientOption) (*grpc.ClientConn, error) {
	o := make([]option.ClientOption, 0, len(opt))
	for _, opt := range opt {
		o = append(o, opt.Resolve())
	}
	return transport.DialGRPC(ctx, o...)
}

// NewClient creates a new logging service client.
//
// Service for ingesting and querying logs.
func NewClient(ctx context.Context, opts ...option.ClientOption) (*Client, error) {
	conn, err := transport.DialGRPC(ctx, append(defaultClientOptions(), opts...)...)
	if err != nil {
		return nil, err
	}
	c := &Client{
		conn:        conn,
		client:      loggingpb.NewLoggingServiceV2Client(conn),
		CallOptions: defaultCallOptions(),
	}
	c.SetGoogleClientInfo("gax", gax.Version)
	return c, nil
}

// NewSubscriberClient creates a new subscriber service client.
//
// The service that an application uses to manipulate subscriptions and to
// consume messages from a subscription via the `Pull` method.
func NewSubscriberClient(ctx context.Context, opts ...option.ClientOption) (*SubscriberClient, error) {
	conn, err := transport.DialGRPC(ctx, append(defaultSubscriberClientOptions(), opts...)...)
	if err != nil {
		return nil, err
	}
	c := &SubscriberClient{
		conn:        conn,
		client:      pubsubpb.NewSubscriberClient(conn),
		CallOptions: defaultSubscriberCallOptions(),
	}
	c.SetGoogleClientInfo("gax", gax.Version)
	return c, nil
}

// NewPublisherClient creates a new publisher service client.
//
// The service that an application uses to manipulate topics, and to send
// messages to a topic.
func NewPublisherClient(ctx context.Context, opts ...option.ClientOption) (*PublisherClient, error) {
	conn, err := transport.DialGRPC(ctx, append(defaultPublisherClientOptions(), opts...)...)
	if err != nil {
		return nil, err
	}
	c := &PublisherClient{
		conn:        conn,
		client:      googleapis_pubsub_v1.NewPublisherClient(conn),
		CallOptions: defaultPublisherCallOptions(),
	}
	c.SetGoogleClientInfo("gax", gax.Version)
	return c, nil
}

// NewIamClient creates a new iam client.
//
// Creates and manages service account objects.
//
// Service account is an account that belongs to your project instead
// of to an individual end user. It is used to authenticate calls
// to a Google API.
//
// To create a service account, specify the `project_id` and `account_id`
// for the account.  The `account_id` is unique within the project, and used
// to generate the service account email address and a stable
// `unique_id`.
//
// All other methods can identify accounts using the format
// `projects/{project}/serviceAccounts/{account}`.
// Using `-` as a wildcard for the project will infer the project from
// the account. The `account` value can be the `email` address or the
// `unique_id` of the service account.
func NewIamClient(ctx context.Context, opts ...option.ClientOption) (*IamClient, error) {
	conn, err := transport.DialGRPC(ctx, append(defaultIamClientOptions(), opts...)...)
	if err != nil {
		return nil, err
	}
	c := &IamClient{
		conn:        conn,
		CallOptions: defaultIamCallOptions(),

		iamClient: adminpb.NewIAMClient(conn),
	}
	c.SetGoogleClientInfo("gax", gax.Version)
	return c, nil
}

// NewController2Client creates a new controller2 client.
//
// The Controller service provides the API for orchestrating a collection of
// debugger agents to perform debugging tasks. These agents are each attached
// to a process of an application which may include one or more replicas.
//
// The debugger agents register with the Controller to identify the application
// being debugged, the Debuggee. All agents that register with the same data,
// represent the same Debuggee, and are assigned the same `debuggee_id`.
//
// The debugger agents call the Controller to retrieve  the list of active
// Breakpoints. Agents with the same `debuggee_id` get the same breakpoints
// list. An agent that can fulfill the breakpoint request updates the
// Controller with the breakpoint result. The controller selects the first
// result received and discards the rest of the results.
// Agents that poll again for active breakpoints will no longer have
// the completed breakpoint in the list and should remove that breakpoint from
// their attached process.
//
// The Controller service does not provide a way to retrieve the results of
// a completed breakpoint. This functionality is available using the Debugger
// service.
func NewController2Client(ctx context.Context, opts ...option.ClientOption) (*Controller2Client, error) {
	conn, err := transport.DialGRPC(ctx, append(defaultController2ClientOptions(), opts...)...)
	if err != nil {
		return nil, err
	}
	c := &Controller2Client{
		conn:        conn,
		CallOptions: defaultController2CallOptions(),

		controller2Client: clouddebuggerpb.NewController2Client(conn),
	}
	c.SetGoogleClientInfo("gax", gax.Version)
	return c, nil
}

// NewAdminClient creates a new AdminClient for a given project and instance.
func NewAdminClient(ctx context.Context, project, instance string, opts ...option.ClientOption) (*AdminClient, error) {
	o, err := btopt.DefaultClientOptions(adminAddr, AdminScope, clientUserAgent)
	if err != nil {
		return nil, err
	}
	o = append(o, opts...)
	conn, err := transport.DialGRPC(ctx, o...)
	if err != nil {
		return nil, fmt.Errorf("dialing: %v", err)
	}
	return &AdminClient{
		conn:     conn,
		tClient:  btapb.NewBigtableTableAdminClient(conn),
		project:  project,
		instance: instance,
		md:       metadata.Pairs(resourcePrefixHeader, fmt.Sprintf("projects/%s/instances/%s", project, instance)),
	}, nil
}

// NewInstanceAdminClient creates a new InstanceAdminClient for a given project.
func NewInstanceAdminClient(ctx context.Context, project string, opts ...option.ClientOption) (*InstanceAdminClient, error) {
	o, err := btopt.DefaultClientOptions(instanceAdminAddr, InstanceAdminScope, clientUserAgent)
	if err != nil {
		return nil, err
	}
	o = append(o, opts...)
	conn, err := transport.DialGRPC(ctx, o...)
	if err != nil {
		return nil, fmt.Errorf("dialing: %v", err)
	}
	return &InstanceAdminClient{
		conn:    conn,
		iClient: btapb.NewBigtableInstanceAdminClient(conn),

		project: project,
		md:      metadata.Pairs(resourcePrefixHeader, "projects/"+project),
	}, nil
}

// NewClient creates a new Client for a given dataset.
// If the project ID is empty, it is derived from the DATASTORE_PROJECT_ID environment variable.
// If the DATASTORE_EMULATOR_HOST environment variable is set, client will use its value
// to connect to a locally-running datastore emulator.
func NewClient(ctx context.Context, projectID string, opts ...option.ClientOption) (*Client, error) {
	var o []option.ClientOption
	// Environment variables for gcd emulator:
	// https://cloud.google.com/datastore/docs/tools/datastore-emulator
	// If the emulator is available, dial it directly (and don't pass any credentials).
	if addr := os.Getenv("DATASTORE_EMULATOR_HOST"); addr != "" {
		conn, err := grpc.Dial(addr, grpc.WithInsecure())
		if err != nil {
			return nil, fmt.Errorf("grpc.Dial: %v", err)
		}
		o = []option.ClientOption{option.WithGRPCConn(conn)}
	} else {
		o = []option.ClientOption{
			option.WithEndpoint(prodAddr),
			option.WithScopes(ScopeDatastore),
			option.WithUserAgent(userAgent),
		}
	}
	// Warn if we see the legacy emulator environment variables.
	if os.Getenv("DATASTORE_HOST") != "" && os.Getenv("DATASTORE_EMULATOR_HOST") == "" {
		log.Print("WARNING: legacy environment variable DATASTORE_HOST is ignored. Use DATASTORE_EMULATOR_HOST instead.")
	}
	if os.Getenv("DATASTORE_DATASET") != "" && os.Getenv("DATASTORE_PROJECT_ID") == "" {
		log.Print("WARNING: legacy environment variable DATASTORE_DATASET is ignored. Use DATASTORE_PROJECT_ID instead.")
	}
	if projectID == "" {
		projectID = os.Getenv("DATASTORE_PROJECT_ID")
	}
	if projectID == "" {
		return nil, errors.New("datastore: missing project/dataset id")
	}
	o = append(o, opts...)
	conn, err := transport.DialGRPC(ctx, o...)
	if err != nil {
		return nil, fmt.Errorf("dialing: %v", err)
	}
	return &Client{
		conn:    conn,
		client:  newDatastoreClient(conn, projectID),
		dataset: projectID,
	}, nil

}

func main() {
	ctx := context.Background()
	conn, err := transport.DialGRPC(ctx,
		option.WithEndpoint("speech.googleapis.com:443"),
		option.WithScopes("https://www.googleapis.com/auth/cloud-platform"),
	)
	if err != nil {
		log.Fatal(err)
	}
	defer conn.Close()

	// [START speech_streaming_mic_recognize]
	client, err := speech.NewClient(ctx)
	if err != nil {
		log.Fatal(err)
	}
	stream, err := client.StreamingRecognize(ctx)
	if err != nil {
		log.Fatal(err)
	}
	// Send the initial configuration message.
	if err := stream.Send(&speechpb.StreamingRecognizeRequest{
		StreamingRequest: &speechpb.StreamingRecognizeRequest_StreamingConfig{
			StreamingConfig: &speechpb.StreamingRecognitionConfig{
				Config: &speechpb.RecognitionConfig{
					Encoding:   speechpb.RecognitionConfig_LINEAR16,
					SampleRate: 16000,
				},
			},
		},
	}); err != nil {
		log.Fatal(err)
	}

	go func() {
		// Pipe stdin to the API.
		buf := make([]byte, 1024)
		for {
			n, err := os.Stdin.Read(buf)
			if err == io.EOF {
				return // Nothing else to pipe, return from this goroutine.
			}
			if err != nil {
				log.Printf("Could not read from stdin: %v", err)
				continue
			}
			if err = stream.Send(&speechpb.StreamingRecognizeRequest{
				StreamingRequest: &speechpb.StreamingRecognizeRequest_AudioContent{
					AudioContent: buf[:n],
				},
			}); err != nil {
				log.Printf("Could not send audio: %v", err)
			}
		}
	}()

	for {
		resp, err := stream.Recv()
		if err == io.EOF {
			break
		}
		if err != nil {
			log.Fatalf("Cannot stream results: %v", err)
		}
		if err := resp.Error; err != nil {
			log.Fatalf("Could not recognize: %v", err)
		}
		for _, result := range resp.Results {
			fmt.Printf("Result: %+v\n", result)
		}
	}
	// [END speech_streaming_mic_recognize]
}