/*
 * Copyright (C) 2013 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.inputmethod.latin;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.preference.PreferenceManager;

import com.android.inputmethod.latin.LocaleUtils.RunInLocale;

import java.util.Locale;

public final class Settings implements SharedPreferences.OnSharedPreferenceChangeListener {
    // In the same order as xml/prefs.xml
    public static final String PREF_GENERAL_SETTINGS = "general_settings";
    public static final String PREF_AUTO_CAP = "auto_cap";
    public static final String PREF_VIBRATE_ON = "vibrate_on";
    public static final String PREF_SOUND_ON = "sound_on";
    public static final String PREF_POPUP_ON = "popup_on";
    public static final String PREF_VOICE_MODE = "voice_mode";
    public static final String PREF_CORRECTION_SETTINGS = "correction_settings";
    public static final String PREF_CONFIGURE_DICTIONARIES_KEY = "configure_dictionaries_key";
    public static final String PREF_AUTO_CORRECTION_THRESHOLD = "auto_correction_threshold";
    public static final String PREF_SHOW_SUGGESTIONS_SETTING = "show_suggestions_setting";
    public static final String PREF_MISC_SETTINGS = "misc_settings";
    public static final String PREF_LAST_USER_DICTIONARY_WRITE_TIME =
            "last_user_dictionary_write_time";
    public static final String PREF_ADVANCED_SETTINGS = "pref_advanced_settings";
    public static final String PREF_KEY_USE_CONTACTS_DICT = "pref_key_use_contacts_dict";
    public static final String PREF_KEY_USE_DOUBLE_SPACE_PERIOD =
            "pref_key_use_double_space_period";
    public static final String PREF_SHOW_LANGUAGE_SWITCH_KEY =
            "pref_show_language_switch_key";
    public static final String PREF_INCLUDE_OTHER_IMES_IN_LANGUAGE_SWITCH_LIST =
            "pref_include_other_imes_in_language_switch_list";
    public static final String PREF_CUSTOM_INPUT_STYLES = "custom_input_styles";
    public static final String PREF_KEY_PREVIEW_POPUP_DISMISS_DELAY =
            "pref_key_preview_popup_dismiss_delay";
    public static final String PREF_BIGRAM_PREDICTIONS = "next_word_prediction";
    public static final String PREF_GESTURE_SETTINGS = "gesture_typing_settings";
    public static final String PREF_GESTURE_INPUT = "gesture_input";
    public static final String PREF_VIBRATION_DURATION_SETTINGS =
            "pref_vibration_duration_settings";
    public static final String PREF_KEYPRESS_SOUND_VOLUME =
            "pref_keypress_sound_volume";
    public static final String PREF_GESTURE_PREVIEW_TRAIL = "pref_gesture_preview_trail";
    public static final String PREF_GESTURE_FLOATING_PREVIEW_TEXT =
            "pref_gesture_floating_preview_text";

    public static final String PREF_INPUT_LANGUAGE = "input_language";
    public static final String PREF_SELECTED_LANGUAGES = "selected_languages";
    public static final String PREF_DEBUG_SETTINGS = "debug_settings";

    private Resources mRes;
    private SharedPreferences mPrefs;
    private Locale mCurrentLocale;
    private SettingsValues mSettingsValues;

    private static final Settings sInstance = new Settings();

    public static Settings getInstance() {
        return sInstance;
    }

    public static void init(final Context context) {
        sInstance.onCreate(context);
    }

    private Settings() {
        // Intentional empty constructor for singleton.
    }

    private void onCreate(final Context context) {
        mRes = context.getResources();
        mPrefs = PreferenceManager.getDefaultSharedPreferences(context);
        mPrefs.registerOnSharedPreferenceChangeListener(this);
    }

    public void onDestroy() {
        mPrefs.unregisterOnSharedPreferenceChangeListener(this);
    }

    @Override
    public void onSharedPreferenceChanged(final SharedPreferences prefs, final String key) {
        loadSettings(mCurrentLocale, mSettingsValues.mInputAttributes);
    }

    public void loadSettings(final Locale locale, final InputAttributes inputAttributes) {
        mCurrentLocale = locale;
        final SharedPreferences prefs = mPrefs;
        final RunInLocale<SettingsValues> job = new RunInLocale<SettingsValues>() {
            @Override
            protected SettingsValues job(final Resources res) {
                return new SettingsValues(prefs, res, inputAttributes);
            }
        };
        mSettingsValues = job.runInLocale(mRes, locale);
    }

    // TODO: Remove this method and add proxy method to SettingsValues.
    public SettingsValues getCurrent() {
        return mSettingsValues;
    }
}