/*
 * Copyright (C) 2018 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
 */

package com.android.dialer.contacts.displaypreference;

import android.content.Context;
import android.content.SharedPreferences;
import android.os.UserManager;
import android.preference.PreferenceManager;
import com.android.dialer.inject.ApplicationContext;
import javax.inject.Inject;

/**
 * Implementation of {@link ContactDisplayPreferences} backed by a {@link SharedPreferences}. Can
 * only be instantiated when the device is unlocked.
 */
public final class ContactDisplayPreferencesImpl implements ContactDisplayPreferences {

  private final Context appContext;
  private final SharedPreferences sharedPreferences;
  private final String displayOrderKey;
  private final String sortOrderKey;

  @Inject
  ContactDisplayPreferencesImpl(@ApplicationContext Context appContext) {
    this.appContext = appContext;
    // @Unencrypted preference would be a better choice, but Android Preference only supports the
    // default file. Stub should be used instead when device is locked.
    this.sharedPreferences = PreferenceManager.getDefaultSharedPreferences(appContext);
    displayOrderKey = appContext.getString(R.string.display_options_view_names_as_key);
    sortOrderKey = appContext.getString(R.string.display_options_sort_list_by_key);
  }

  @Override
  public DisplayOrder getDisplayOrder() {
    migrate();
    if (!sharedPreferences.contains(displayOrderKey)) {
      return DisplayOrder.PRIMARY;
    }
    return DisplayOrder.fromValue(appContext, sharedPreferences.getString(displayOrderKey, null));
  }

  @Override
  public void setDisplayOrder(DisplayOrder displayOrder) {
    sharedPreferences.edit().putString(displayOrderKey, displayOrder.getValue(appContext)).apply();
  }

  @Override
  public SortOrder getSortOrder() {
    migrate();
    if (!sharedPreferences.contains(sortOrderKey)) {
      return SortOrder.BY_PRIMARY;
    }
    return SortOrder.fromValue(appContext, sharedPreferences.getString(sortOrderKey, null));
  }

  @Override
  public void setSortOrder(SortOrder sortOrder) {
    sharedPreferences.edit().putString(sortOrderKey, sortOrder.getValue(appContext)).apply();
  }

  /**
   * Moves the stored values to the standard location.
   *
   * <p>Usually preferences are stored in {@code package.name_preferences.xml}. However the old
   * com.android.contacts.common.preference.ContactsPreferences stored it in {@code
   * package.name.xml} which is incompatible with the regular {@link android.preference.Preference}
   * widgets.
   */
  private void migrate() {
    if (!appContext.getSystemService(UserManager.class).isUserUnlocked()) {
      return;
    }
    SharedPreferences oldPreference =
        appContext.getSharedPreferences(appContext.getPackageName(), Context.MODE_PRIVATE);
    if (oldPreference.contains(displayOrderKey) || oldPreference.contains(sortOrderKey)) {
      sharedPreferences
          .edit()
          .putString(
              displayOrderKey,
              translateLegacyDisplayOrder(oldPreference.getInt(displayOrderKey, 1)))
          .putString(sortOrderKey, translateLegacySortOrder(oldPreference.getInt(sortOrderKey, 1)))
          .apply();
      oldPreference.edit().remove(displayOrderKey).remove(sortOrderKey).apply();
    }
  }

  private String translateLegacyDisplayOrder(int legacyValue) {
    switch (legacyValue) {
      case 2:
        return DisplayOrder.ALTERNATIVE.getValue(appContext);
      default:
        return DisplayOrder.PRIMARY.getValue(appContext);
    }
  }

  private String translateLegacySortOrder(int legacyValue) {
    switch (legacyValue) {
      case 2:
        return SortOrder.BY_ALTERNATIVE.getValue(appContext);
      default:
        return SortOrder.BY_PRIMARY.getValue(appContext);
    }
  }
}