// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "remoting/host/cloud_heartbeat_service_client.h"

#include <memory>
#include <optional>
#include <string>
#include <utility>

#include "base/functional/callback.h"
#include "base/strings/stringize_macros.h"
#include "remoting/base/environment_details.h"
#include "remoting/base/instance_identity_token_getter.h"
#include "remoting/base/oauth_token_getter_impl.h"
#include "remoting/base/protobuf_http_client.h"
#include "remoting/host/version.h"
#include "remoting/proto/google/internal/remoting/cloud/v1alpha/empty.pb.h"
#include "remoting/proto/google/internal/remoting/cloud/v1alpha/remote_access_host.pb.h"
#include "remoting/proto/google/internal/remoting/cloud/v1alpha/remote_access_service.pb.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"

namespace remoting {

namespace {
using Empty = google::internal::remoting::cloud::v1alpha::Empty;
using RemoteAccessHost =
    google::internal::remoting::cloud::v1alpha::RemoteAccessHost;
using SendHeartbeatRequest =
    google::internal::remoting::cloud::v1alpha::SendHeartbeatRequest;
using UpdateRemoteAccessHostRequest =
    google::internal::remoting::cloud::v1alpha::UpdateRemoteAccessHostRequest;
}  // namespace

CloudHeartbeatServiceClient::CloudHeartbeatServiceClient(
    const std::string& directory_id,
    OAuthTokenGetter* oauth_token_getter,
    InstanceIdentityTokenGetter* instance_identity_token_getter,
    scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory)
    : directory_id_(directory_id),
      client_(CloudServiceClient::CreateForChromotingRobotAccount(
          oauth_token_getter,
          url_loader_factory)),
      instance_identity_token_getter_(instance_identity_token_getter) {}

CloudHeartbeatServiceClient::~CloudHeartbeatServiceClient() = default;

void CloudHeartbeatServiceClient::SendFullHeartbeat(
    bool is_initial_heartbeat,
    std::optional<std::string> signaling_id,
    std::optional<std::string> offline_reason,
    HeartbeatResponseCallback callback) {
  instance_identity_token_getter_->RetrieveToken(base::BindOnce(
      &CloudHeartbeatServiceClient::SendFullHeartbeatWithIdToken,
      weak_factory_.GetWeakPtr(), is_initial_heartbeat, std::move(signaling_id),
      std::move(offline_reason), std::move(callback)));
}

void CloudHeartbeatServiceClient::SendFullHeartbeatWithIdToken(
    bool is_initial_heartbeat,
    std::optional<std::string> signaling_id,
    std::optional<std::string> offline_reason,
    HeartbeatResponseCallback callback,
    std::string_view instance_identity_token) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);

  if (offline_reason.has_value() && !offline_reason->empty()) {
    // We ignore 'is_initial_heartbeat' because the host is offline so we're
    // just updating the Directory to indicate that, we don't need to send a
    // heartbeat afterwards.
    MakeUpdateRemoteAccessHostCall(
        signaling_id, offline_reason, instance_identity_token,
        base::BindOnce(&CloudHeartbeatServiceClient::OnReportHostOffline,
                       weak_factory_.GetWeakPtr(), std::move(callback)));
  } else if (is_initial_heartbeat) {
    MakeUpdateRemoteAccessHostCall(
        signaling_id, offline_reason, instance_identity_token,
        base::BindOnce(
            &CloudHeartbeatServiceClient::OnUpdateRemoteAccessHostResponse,
            weak_factory_.GetWeakPtr(), std::move(callback)));
  } else {
    client_->SendHeartbeat(
        directory_id_, instance_identity_token,
        base::BindOnce(&CloudHeartbeatServiceClient::OnSendHeartbeatResponse,
                       weak_factory_.GetWeakPtr(), std::move(callback)));
  }
}

void CloudHeartbeatServiceClient::SendLiteHeartbeat(
    HeartbeatResponseCallback callback) {
  instance_identity_token_getter_->RetrieveToken(
      base::BindOnce(&CloudHeartbeatServiceClient::SendLiteHeartbeatWithIdToken,
                     weak_factory_.GetWeakPtr(), std::move(callback)));
}

void CloudHeartbeatServiceClient::SendLiteHeartbeatWithIdToken(
    HeartbeatResponseCallback callback,
    std::string_view instance_identity_token) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);

  client_->SendHeartbeat(
      directory_id_, instance_identity_token,
      base::BindOnce(&CloudHeartbeatServiceClient::OnSendHeartbeatResponse,
                     weak_factory_.GetWeakPtr(), std::move(callback)));
}

void CloudHeartbeatServiceClient::CancelPendingRequests() {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
  client_->CancelPendingRequests();
}

void CloudHeartbeatServiceClient::OnSendHeartbeatResponse(
    HeartbeatResponseCallback callback,
    const HttpStatus& status,
    std::unique_ptr<Empty>) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);

  RunHeartbeatResponseCallback(std::move(callback), status);
}

void CloudHeartbeatServiceClient::OnUpdateRemoteAccessHostResponse(
    HeartbeatResponseCallback callback,
    const HttpStatus& status,
    std::unique_ptr<RemoteAccessHost>) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);

  if (status.ok()) {
    SendLiteHeartbeat(std::move(callback));
  } else {
    RunHeartbeatResponseCallback(std::move(callback), status);
  }
}

void CloudHeartbeatServiceClient::OnReportHostOffline(
    HeartbeatResponseCallback callback,
    const HttpStatus& status,
    std::unique_ptr<RemoteAccessHost>) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);

  RunHeartbeatResponseCallback(std::move(callback), status);
}

void CloudHeartbeatServiceClient::MakeUpdateRemoteAccessHostCall(
    std::optional<std::string> signaling_id,
    std::optional<std::string> offline_reason,
    std::string_view instance_identity_token,
    CloudServiceClient::UpdateRemoteAccessHostCallback callback) {
  constexpr auto* host_version = STRINGIZE(VERSION);
  client_->UpdateRemoteAccessHost(directory_id_, host_version, signaling_id,
                                  offline_reason, GetOperatingSystemName(),
                                  GetOperatingSystemVersion(),
                                  instance_identity_token, std::move(callback));
}

void CloudHeartbeatServiceClient::RunHeartbeatResponseCallback(
    HeartbeatResponseCallback callback,
    const HttpStatus& status) {
  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);

  if (!status.ok()) {
    OnError(std::move(callback), status);
    return;
  }

  // Cloud hosts always require session authorization and do not support
  // changing the email address of the primary user. This service client always
  // uses 'lite' heartbeats.
  // TODO: joedow - Return wait interval from the service and pass it through.
  std::move(callback).Run(status, /*wait_interval=*/std::nullopt,
                          /*primary_user_email=*/"",
                          /*require_session_authorization=*/true,
                          /*use_lite_heartbeat=*/true);
}

}  // namespace remoting