//
// 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/binder_service_android.h"

#include <base/bind.h>
#include <base/logging.h>
#include <binderwrapper/binder_wrapper.h>
#include <brillo/errors/error.h>
#include <utils/String8.h>

using android::binder::Status;
using android::os::IUpdateEngineCallback;
using update_engine::UpdateEngineStatus;

namespace {
Status ErrorPtrToStatus(const brillo::ErrorPtr& error) {
  return Status::fromServiceSpecificError(
      1, android::String8{error->GetMessage().c_str()});
}
}  // namespace

namespace chromeos_update_engine {

BinderUpdateEngineAndroidService::BinderUpdateEngineAndroidService(
    ServiceDelegateAndroidInterface* service_delegate)
    : service_delegate_(service_delegate) {}

void BinderUpdateEngineAndroidService::SendStatusUpdate(
    const UpdateEngineStatus& update_engine_status) {
  last_status_ = static_cast<int>(update_engine_status.status);
  last_progress_ = update_engine_status.progress;
  for (auto& callback : callbacks_) {
    callback->onStatusUpdate(last_status_, last_progress_);
  }
}

void BinderUpdateEngineAndroidService::SendPayloadApplicationComplete(
    ErrorCode error_code) {
  for (auto& callback : callbacks_) {
    callback->onPayloadApplicationComplete(static_cast<int>(error_code));
  }
}

Status BinderUpdateEngineAndroidService::bind(
    const android::sp<IUpdateEngineCallback>& callback, bool* return_value) {
  callbacks_.emplace_back(callback);

  const android::sp<IBinder>& callback_binder =
      IUpdateEngineCallback::asBinder(callback);
  auto binder_wrapper = android::BinderWrapper::Get();
  binder_wrapper->RegisterForDeathNotifications(
      callback_binder,
      base::Bind(
          base::IgnoreResult(&BinderUpdateEngineAndroidService::UnbindCallback),
          base::Unretained(this),
          base::Unretained(callback_binder.get())));

  // Send an status update on connection (except when no update sent so far),
  // since the status update is oneway and we don't need to wait for the
  // response.
  if (last_status_ != -1)
    callback->onStatusUpdate(last_status_, last_progress_);

  *return_value = true;
  return Status::ok();
}

Status BinderUpdateEngineAndroidService::unbind(
    const android::sp<IUpdateEngineCallback>& callback, bool* return_value) {
  const android::sp<IBinder>& callback_binder =
      IUpdateEngineCallback::asBinder(callback);
  auto binder_wrapper = android::BinderWrapper::Get();
  binder_wrapper->UnregisterForDeathNotifications(callback_binder);

  *return_value = UnbindCallback(callback_binder.get());
  return Status::ok();
}

Status BinderUpdateEngineAndroidService::applyPayload(
    const android::String16& url,
    int64_t payload_offset,
    int64_t payload_size,
    const std::vector<android::String16>& header_kv_pairs) {
  const std::string payload_url{android::String8{url}.string()};
  std::vector<std::string> str_headers;
  str_headers.reserve(header_kv_pairs.size());
  for (const auto& header : header_kv_pairs) {
    str_headers.emplace_back(android::String8{header}.string());
  }

  brillo::ErrorPtr error;
  if (!service_delegate_->ApplyPayload(
          payload_url, payload_offset, payload_size, str_headers, &error)) {
    return ErrorPtrToStatus(error);
  }
  return Status::ok();
}

Status BinderUpdateEngineAndroidService::suspend() {
  brillo::ErrorPtr error;
  if (!service_delegate_->SuspendUpdate(&error))
    return ErrorPtrToStatus(error);
  return Status::ok();
}

Status BinderUpdateEngineAndroidService::resume() {
  brillo::ErrorPtr error;
  if (!service_delegate_->ResumeUpdate(&error))
    return ErrorPtrToStatus(error);
  return Status::ok();
}

Status BinderUpdateEngineAndroidService::cancel() {
  brillo::ErrorPtr error;
  if (!service_delegate_->CancelUpdate(&error))
    return ErrorPtrToStatus(error);
  return Status::ok();
}

Status BinderUpdateEngineAndroidService::resetStatus() {
  brillo::ErrorPtr error;
  if (!service_delegate_->ResetStatus(&error))
    return ErrorPtrToStatus(error);
  return Status::ok();
}

Status BinderUpdateEngineAndroidService::verifyPayloadApplicable(
    const android::String16& metadata_filename, bool* return_value) {
  const std::string payload_metadata{
      android::String8{metadata_filename}.string()};
  LOG(INFO) << "Received a request of verifying payload metadata in "
            << payload_metadata << ".";
  brillo::ErrorPtr error;
  *return_value =
      service_delegate_->VerifyPayloadApplicable(payload_metadata, &error);
  if (error != nullptr)
    return ErrorPtrToStatus(error);
  return Status::ok();
}

bool BinderUpdateEngineAndroidService::UnbindCallback(const IBinder* callback) {
  auto it = std::find_if(
      callbacks_.begin(),
      callbacks_.end(),
      [&callback](const android::sp<IUpdateEngineCallback>& elem) {
        return IUpdateEngineCallback::asBinder(elem).get() == callback;
      });
  if (it == callbacks_.end()) {
    LOG(ERROR) << "Unable to unbind unknown callback.";
    return false;
  }
  callbacks_.erase(it);
  return true;
}

}  // namespace chromeos_update_engine