//
// Copyright (C) 2015 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#include "update_engine/client_library/client_binder.h"

#include <binder/IServiceManager.h>

#include <base/message_loop/message_loop.h>
#include <utils/String8.h>

#include "update_engine/common_service.h"
#include "update_engine/parcelable_update_engine_status.h"
#include "update_engine/update_status_utils.h"

using android::OK;
using android::String16;
using android::String8;
using android::brillo::ParcelableUpdateEngineStatus;
using android::binder::Status;
using android::getService;
using chromeos_update_engine::StringToUpdateStatus;
using chromeos_update_engine::UpdateEngineService;
using std::string;

namespace update_engine {
namespace internal {

bool BinderUpdateEngineClient::Init() {
  if (!binder_watcher_.Init()) return false;

  return getService(String16{"android.brillo.UpdateEngineService"},
      &service_) == OK;
}

bool BinderUpdateEngineClient::AttemptUpdate(const string& in_app_version,
                                             const string& in_omaha_url,
                                             bool at_user_request) {
  return service_->AttemptUpdate(String16{in_app_version.c_str()},
      String16{in_omaha_url.c_str()},
      at_user_request ? 0 :
          UpdateEngineService::kAttemptUpdateFlagNonInteractive).isOk();
}

bool BinderUpdateEngineClient::GetStatus(int64_t* out_last_checked_time,
                                         double* out_progress,
                                         UpdateStatus* out_update_status,
                                         string* out_new_version,
                                         int64_t* out_new_size) const {
  ParcelableUpdateEngineStatus status;

  if (!service_->GetStatus(&status).isOk())
    return false;

  *out_last_checked_time = status.last_checked_time_;
  *out_progress = status.progress_;
  StringToUpdateStatus(String8{status.current_operation_}.string(),
                       out_update_status);
  *out_new_version = String8{status.new_version_}.string();
  *out_new_size = status.new_size_;
  return true;
}

bool BinderUpdateEngineClient::SetUpdateOverCellularPermission(bool allowed) {
  return service_->SetUpdateOverCellularPermission(allowed).isOk();
}

bool BinderUpdateEngineClient::GetUpdateOverCellularPermission(
    bool* allowed) const {
  return service_->GetUpdateOverCellularPermission(allowed).isOk();
}

bool BinderUpdateEngineClient::SetP2PUpdatePermission(bool enabled) {
  return service_->SetP2PUpdatePermission(enabled).isOk();
}

bool BinderUpdateEngineClient::GetP2PUpdatePermission(bool* enabled) const {
  return service_->GetP2PUpdatePermission(enabled).isOk();
}

bool BinderUpdateEngineClient::Rollback(bool powerwash) {
  return service_->AttemptRollback(powerwash).isOk();
}

bool BinderUpdateEngineClient::GetRollbackPartition(
    string* rollback_partition) const {
  String16 out_as_string16;

  if (!service_->GetRollbackPartition(&out_as_string16).isOk())
    return false;

  *rollback_partition = String8{out_as_string16}.string();
  return true;
}

bool BinderUpdateEngineClient::GetPrevVersion(string* prev_version) const {
  String16 out_as_string16;

  if (!service_->GetPrevVersion(&out_as_string16).isOk())
    return false;

  *prev_version = String8{out_as_string16}.string();
  return true;
}

void BinderUpdateEngineClient::RebootIfNeeded() {
  if (!service_->RebootIfNeeded().isOk()) {
    // Reboot error code doesn't necessarily mean that a reboot
    // failed. For example, D-Bus may be shutdown before we receive the
    // result.
    LOG(INFO) << "RebootIfNeeded() failure ignored.";
  }
}

bool BinderUpdateEngineClient::ResetStatus() {
  return service_->ResetStatus().isOk();
}

Status BinderUpdateEngineClient::StatusUpdateCallback::HandleStatusUpdate(
    int64_t last_checked_time,
    double progress,
    const String16& current_operation,
    const String16& new_version,
    int64_t new_size) {
  UpdateStatus update_status;

  StringToUpdateStatus(String8{current_operation}.string(), &update_status);

  for (auto& handler : client_->handlers_) {
    handler->HandleStatusUpdate(last_checked_time, progress, update_status,
                                String8{new_version}.string(), new_size);
  }

  return Status::ok();
}

bool BinderUpdateEngineClient::RegisterStatusUpdateHandler(
    StatusUpdateHandler* handler) {
  if (!status_callback_.get()) {
    status_callback_ =
        new BinderUpdateEngineClient::StatusUpdateCallback(this);
    if (!service_->RegisterStatusCallback(status_callback_).isOk()) {
      return false;
    }
  }

  handlers_.push_back(handler);

  int64_t last_checked_time;
  double progress;
  UpdateStatus update_status;
  string new_version;
  int64_t new_size;

  if (!GetStatus(&last_checked_time, &progress, &update_status,
                 &new_version, &new_size)) {
    handler->IPCError("Could not get status from binder service");
  }

  handler->HandleStatusUpdate(last_checked_time, progress, update_status,
                              new_version, new_size);

  return true;
}

bool BinderUpdateEngineClient::UnregisterStatusUpdateHandler(
    StatusUpdateHandler* handler) {
  auto it = handlers_.begin();

  for (; *it != handler && it != handlers_.end(); it++);

  if (it != handlers_.end()) {
    handlers_.erase(it);
    return true;
  }

  return false;
}

bool BinderUpdateEngineClient::SetTargetChannel(const string& in_target_channel,
                                                bool allow_powerwash) {
  return service_->SetChannel(String16{in_target_channel.c_str()},
                              allow_powerwash).isOk();
}

bool BinderUpdateEngineClient::GetTargetChannel(string* out_channel) const {
  String16 out_as_string16;

  if (!service_->GetChannel(false, &out_as_string16).isOk())
    return false;

  *out_channel = String8{out_as_string16}.string();
  return true;
}

bool BinderUpdateEngineClient::GetChannel(string* out_channel) const {
  String16 out_as_string16;

  if (!service_->GetChannel(true, &out_as_string16).isOk())
    return false;

  *out_channel = String8{out_as_string16}.string();
  return true;
}

bool BinderUpdateEngineClient::GetLastAttemptError(
    int32_t* last_attempt_error) const {
  int out_as_int;

  if (!service_->GetLastAttemptError(&out_as_int).isOk())
    return false;

  *last_attempt_error = out_as_int;
  return true;
}

}  // namespace internal
}  // namespace update_engine