/*
 * Copyright (C) 2020 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 "chre/core/settings.h"

#include <cstddef>

#include "chre/core/event_loop_manager.h"
#include "chre/platform/log.h"
#include "chre/util/nested_data_ptr.h"

#include "chre_api/chre/user_settings.h"

namespace chre {

namespace {

constexpr size_t kNumSettings = static_cast<size_t>(Setting::SETTING_MAX);

//! The current state for each setting.
SettingState gSettingStateList[kNumSettings];

/**
 * @param setting The setting to get the index for.
 * @param index A non-null pointer to store the index.
 *
 * @return false if the setting was invalid.
 */
bool getIndexForSetting(Setting setting, size_t *index) {
  if (setting < Setting::SETTING_MAX) {
    *index = static_cast<size_t>(setting);
    return true;
  }

  return false;
}

void setSettingState(Setting setting, SettingState state) {
  size_t index;
  if (!getIndexForSetting(setting, &index)) {
    LOGE("Unknown setting %" PRId8, static_cast<int8_t>(setting));
  } else {
    gSettingStateList[index] = state;
  }
}

const char *getSettingStateString(Setting setting) {
  switch (getSettingState(setting)) {
    case SettingState::ENABLED:
      return "enabled";
      break;
    case SettingState::DISABLED:
      return "disabled";
      break;
    default:
      break;
  }

  return "unknown";
}

void sendSettingChangedNotification(Setting setting, SettingState state) {
  auto *eventData = memoryAlloc<struct chreUserSettingChangedEvent>();
  auto settingAsInt = static_cast<uint8_t>(setting);
  uint16_t eventType = CHRE_EVENT_SETTING_CHANGED_FIRST_EVENT + settingAsInt;

  if (eventData != nullptr) {
    eventData->setting = settingAsInt;
    eventData->settingState = static_cast<int8_t>(state);

    EventLoopManagerSingleton::get()->getEventLoop().postEventOrDie(
        eventType, eventData, freeEventDataCallback, kBroadcastInstanceId);
  } else {
    LOG_OOM();
  }
}

void settingChangedCallback(uint16_t /* type */, void *data, void *extraData) {
  Setting setting = NestedDataPtr<Setting>(data);
  SettingState settingState = NestedDataPtr<SettingState>(extraData);

  setSettingState(setting, settingState);

  LOGD("Setting changed callback called for setting %u state %u",
       static_cast<uint8_t>(setting), static_cast<uint8_t>(settingState));

#ifdef CHRE_GNSS_SUPPORT_ENABLED
  EventLoopManagerSingleton::get()->getGnssManager().onSettingChanged(
      setting, settingState);
#endif  // CHRE_GNSS_SUPPORT_ENABLED

#ifdef CHRE_AUDIO_SUPPORT_ENABLED
  EventLoopManagerSingleton::get()->getAudioRequestManager().onSettingChanged(
      setting, settingState);
#endif  // CHRE_AUDIO_SUPPORT_ENABLED

  sendSettingChangedNotification(setting, settingState);
}

}  // anonymous namespace

void postSettingChange(Setting setting, SettingState state) {
  LOGD("Posting setting change: setting type %" PRIu8 " state %" PRIu8,
       static_cast<uint8_t>(setting), static_cast<uint8_t>(state));

  EventLoopManagerSingleton::get()->deferCallback(
      SystemCallbackType::SettingChangeEvent, NestedDataPtr<Setting>(setting),
      settingChangedCallback, NestedDataPtr<SettingState>(state));
}

SettingState getSettingState(Setting setting) {
  size_t index;
  if (getIndexForSetting(setting, &index)) {
    return gSettingStateList[index];
  }

  LOGE("Unknown setting %" PRIu8, static_cast<uint8_t>(setting));
  return SettingState::UNKNOWN;
}

int8_t getSettingStateAsInt8(uint8_t setting) {
  int8_t state = CHRE_USER_SETTING_STATE_UNKNOWN;
  if (setting < static_cast<uint8_t>(Setting::SETTING_MAX)) {
    auto settingEnum = static_cast<Setting>(setting);
    state = static_cast<int8_t>(getSettingState(settingEnum));
  }
  return state;
}

void logSettingStateToBuffer(DebugDumpWrapper &debugDump) {
  debugDump.print("\nSettings:");
  debugDump.print("\n Location %s", getSettingStateString(Setting::LOCATION));
  debugDump.print("\n WiFi available %s",
                  getSettingStateString(Setting::WIFI_AVAILABLE));
  debugDump.print("\n Airplane mode %s",
                  getSettingStateString(Setting::AIRPLANE_MODE));
  debugDump.print("\n Microphone Access %s",
                  getSettingStateString(Setting::MICROPHONE));
}

}  // namespace chre