/*
 * Copyright (C) 2017 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.common;

import android.content.Context;
import android.content.SharedPreferences;
import android.support.annotation.Nullable;
import android.telecom.PhoneAccountHandle;
import java.util.Set;

/**
 * Class that helps us store dialer preferences that are phone account dependent. This is necessary
 * for cases such as settings that are phone account dependent e.g endless vm. The logic is to
 * essentially store the shared preference by appending the phone account id to the key.
 */
public class PerAccountSharedPreferences {
  private final String sharedPrefsKeyPrefix;
  private final SharedPreferences preferences;
  private final PhoneAccountHandle phoneAccountHandle;

  public PerAccountSharedPreferences(
      Context context, PhoneAccountHandle handle, SharedPreferences prefs) {
    preferences = prefs;
    phoneAccountHandle = handle;
    sharedPrefsKeyPrefix = "phone_account_dependent_";
  }

  /**
   * Not to be used, currently only used by {@VisualVoicemailPreferences} for legacy reasons.
   */
  protected PerAccountSharedPreferences(
      Context context, PhoneAccountHandle handle, SharedPreferences prefs, String prefix) {
    Assert.checkArgument(prefix.equals("visual_voicemail_"));
    preferences = prefs;
    phoneAccountHandle = handle;
    sharedPrefsKeyPrefix = prefix;
  }

  public class Editor {

    private final SharedPreferences.Editor editor;

    private Editor() {
      editor = preferences.edit();
    }

    public void apply() {
      editor.apply();
    }

    public Editor putBoolean(String key, boolean value) {
      editor.putBoolean(getKey(key), value);
      return this;
    }

    public Editor putFloat(String key, float value) {
      editor.putFloat(getKey(key), value);
      return this;
    }

    public Editor putInt(String key, int value) {
      editor.putInt(getKey(key), value);
      return this;
    }

    public Editor putLong(String key, long value) {
      editor.putLong(getKey(key), value);
      return this;
    }

    public Editor putString(String key, String value) {
      editor.putString(getKey(key), value);
      return this;
    }

    public Editor putStringSet(String key, Set<String> value) {
      editor.putStringSet(getKey(key), value);
      return this;
    }
  }

  public Editor edit() {
    return new Editor();
  }

  public boolean getBoolean(String key, boolean defValue) {
    return getValue(key, defValue);
  }

  public float getFloat(String key, float defValue) {
    return getValue(key, defValue);
  }

  public int getInt(String key, int defValue) {
    return getValue(key, defValue);
  }

  public long getLong(String key, long defValue) {
    return getValue(key, defValue);
  }

  public String getString(String key, String defValue) {
    return getValue(key, defValue);
  }

  @Nullable
  public String getString(String key) {
    return getValue(key, null);
  }

  public Set<String> getStringSet(String key, Set<String> defValue) {
    return getValue(key, defValue);
  }

  public boolean contains(String key) {
    return preferences.contains(getKey(key));
  }

  private <T> T getValue(String key, T defValue) {
    if (!contains(key)) {
      return defValue;
    }
    Object object = preferences.getAll().get(getKey(key));
    if (object == null) {
      return defValue;
    }
    return (T) object;
  }

  private String getKey(String key) {
    return sharedPrefsKeyPrefix + key + "_" + phoneAccountHandle.getId();
  }
}