michael@0: /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: package org.mozilla.gecko.home;
michael@0: 
michael@0: import static org.mozilla.gecko.home.HomeConfig.createBuiltinPanelConfig;
michael@0: 
michael@0: import java.util.ArrayList;
michael@0: import java.util.EnumSet;
michael@0: import java.util.List;
michael@0: import java.util.Locale;
michael@0: 
michael@0: import org.json.JSONArray;
michael@0: import org.json.JSONException;
michael@0: import org.json.JSONObject;
michael@0: import org.mozilla.gecko.GeckoSharedPrefs;
michael@0: import org.mozilla.gecko.home.HomeConfig.HomeConfigBackend;
michael@0: import org.mozilla.gecko.home.HomeConfig.OnReloadListener;
michael@0: import org.mozilla.gecko.home.HomeConfig.PanelConfig;
michael@0: import org.mozilla.gecko.home.HomeConfig.PanelType;
michael@0: import org.mozilla.gecko.home.HomeConfig.State;
michael@0: import org.mozilla.gecko.util.HardwareUtils;
michael@0: 
michael@0: import android.content.BroadcastReceiver;
michael@0: import android.content.Context;
michael@0: import android.content.Intent;
michael@0: import android.content.IntentFilter;
michael@0: import android.content.SharedPreferences;
michael@0: import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
michael@0: import android.support.v4.content.LocalBroadcastManager;
michael@0: import android.text.TextUtils;
michael@0: import android.util.Log;
michael@0: 
michael@0: class HomeConfigPrefsBackend implements HomeConfigBackend {
michael@0:     private static final String LOGTAG = "GeckoHomeConfigBackend";
michael@0: 
michael@0:     private static final String PREFS_CONFIG_KEY = "home_panels";
michael@0:     private static final String PREFS_LOCALE_KEY = "home_locale";
michael@0: 
michael@0:     private static final String RELOAD_BROADCAST = "HomeConfigPrefsBackend:Reload";
michael@0: 
michael@0:     private final Context mContext;
michael@0:     private ReloadBroadcastReceiver mReloadBroadcastReceiver;
michael@0:     private OnReloadListener mReloadListener;
michael@0: 
michael@0:     public HomeConfigPrefsBackend(Context context) {
michael@0:         mContext = context;
michael@0:     }
michael@0: 
michael@0:     private SharedPreferences getSharedPreferences() {
michael@0:         return GeckoSharedPrefs.forProfile(mContext);
michael@0:     }
michael@0: 
michael@0:     private State loadDefaultConfig() {
michael@0:         final ArrayList<PanelConfig> panelConfigs = new ArrayList<PanelConfig>();
michael@0: 
michael@0:         panelConfigs.add(createBuiltinPanelConfig(mContext, PanelType.TOP_SITES,
michael@0:                                                   EnumSet.of(PanelConfig.Flags.DEFAULT_PANEL)));
michael@0: 
michael@0:         panelConfigs.add(createBuiltinPanelConfig(mContext, PanelType.BOOKMARKS));
michael@0: 
michael@0:         // We disable reader mode support on low memory devices. Hence the
michael@0:         // reading list panel should not show up on such devices.
michael@0:         if (!HardwareUtils.isLowMemoryPlatform()) {
michael@0:             panelConfigs.add(createBuiltinPanelConfig(mContext, PanelType.READING_LIST));
michael@0:         }
michael@0: 
michael@0:         final PanelConfig historyEntry = createBuiltinPanelConfig(mContext, PanelType.HISTORY);
michael@0: 
michael@0:         // On tablets, the history panel is the last.
michael@0:         // On phones, the history panel is the first one.
michael@0:         if (HardwareUtils.isTablet()) {
michael@0:             panelConfigs.add(historyEntry);
michael@0:         } else {
michael@0:             panelConfigs.add(0, historyEntry);
michael@0:         }
michael@0: 
michael@0:         return new State(panelConfigs, true);
michael@0:     }
michael@0: 
michael@0:     private State loadConfigFromString(String jsonString) {
michael@0:         final JSONArray jsonPanelConfigs;
michael@0:         try {
michael@0:             jsonPanelConfigs = new JSONArray(jsonString);
michael@0:         } catch (JSONException e) {
michael@0:             Log.e(LOGTAG, "Error loading the list of home panels from JSON prefs", e);
michael@0: 
michael@0:             // Fallback to default config
michael@0:             return loadDefaultConfig();
michael@0:         }
michael@0: 
michael@0:         final ArrayList<PanelConfig> panelConfigs = new ArrayList<PanelConfig>();
michael@0: 
michael@0:         final int count = jsonPanelConfigs.length();
michael@0:         for (int i = 0; i < count; i++) {
michael@0:             try {
michael@0:                 final JSONObject jsonPanelConfig = jsonPanelConfigs.getJSONObject(i);
michael@0:                 final PanelConfig panelConfig = new PanelConfig(jsonPanelConfig);
michael@0:                 panelConfigs.add(panelConfig);
michael@0:             } catch (Exception e) {
michael@0:                 Log.e(LOGTAG, "Exception loading PanelConfig from JSON", e);
michael@0:             }
michael@0:         }
michael@0: 
michael@0:         return new State(panelConfigs, false);
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public State load() {
michael@0:         final SharedPreferences prefs = getSharedPreferences();
michael@0:         final String jsonString = prefs.getString(PREFS_CONFIG_KEY, null);
michael@0: 
michael@0:         final State configState;
michael@0:         if (TextUtils.isEmpty(jsonString)) {
michael@0:             configState = loadDefaultConfig();
michael@0:         } else {
michael@0:             configState = loadConfigFromString(jsonString);
michael@0:         }
michael@0: 
michael@0:         return configState;
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void save(State configState) {
michael@0:         final SharedPreferences prefs = getSharedPreferences();
michael@0:         final SharedPreferences.Editor editor = prefs.edit();
michael@0: 
michael@0:         // No need to save the state to disk if it represents the default
michael@0:         // HomeConfig configuration. Simply force all existing HomeConfigLoader
michael@0:         // instances to refresh their contents.
michael@0:         if (!configState.isDefault()) {
michael@0:             final JSONArray jsonPanelConfigs = new JSONArray();
michael@0: 
michael@0:             for (PanelConfig panelConfig : configState) {
michael@0:                 try {
michael@0:                     final JSONObject jsonPanelConfig = panelConfig.toJSON();
michael@0:                     jsonPanelConfigs.put(jsonPanelConfig);
michael@0:                 } catch (Exception e) {
michael@0:                     Log.e(LOGTAG, "Exception converting PanelConfig to JSON", e);
michael@0:                 }
michael@0:             }
michael@0: 
michael@0:             editor.putString(PREFS_CONFIG_KEY, jsonPanelConfigs.toString());
michael@0:         }
michael@0: 
michael@0:         editor.putString(PREFS_LOCALE_KEY, Locale.getDefault().toString());
michael@0:         editor.commit();
michael@0: 
michael@0:         // Trigger reload listeners on all live backend instances
michael@0:         sendReloadBroadcast();
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public String getLocale() {
michael@0:         final SharedPreferences prefs = getSharedPreferences();
michael@0: 
michael@0:         String locale = prefs.getString(PREFS_LOCALE_KEY, null);
michael@0:         if (locale == null) {
michael@0:             // Initialize config with the current locale
michael@0:             final String currentLocale = Locale.getDefault().toString();
michael@0: 
michael@0:             final SharedPreferences.Editor editor = prefs.edit();
michael@0:             editor.putString(PREFS_LOCALE_KEY, currentLocale);
michael@0:             editor.commit();
michael@0: 
michael@0:             // If the user has saved HomeConfig before, return null this
michael@0:             // one time to trigger a refresh and ensure we use the
michael@0:             // correct locale for the saved state. For more context,
michael@0:             // see HomePanelsManager.onLocaleReady().
michael@0:             if (!prefs.contains(PREFS_CONFIG_KEY)) {
michael@0:                 locale = currentLocale;
michael@0:             }
michael@0:         }
michael@0: 
michael@0:         return locale;
michael@0:     }
michael@0: 
michael@0:     @Override
michael@0:     public void setOnReloadListener(OnReloadListener listener) {
michael@0:         if (mReloadListener != null) {
michael@0:             unregisterReloadReceiver();
michael@0:             mReloadBroadcastReceiver = null;
michael@0:         }
michael@0: 
michael@0:         mReloadListener = listener;
michael@0: 
michael@0:         if (mReloadListener != null) {
michael@0:             mReloadBroadcastReceiver = new ReloadBroadcastReceiver();
michael@0:             registerReloadReceiver();
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     private void sendReloadBroadcast() {
michael@0:         final LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(mContext);
michael@0:         final Intent reloadIntent = new Intent(RELOAD_BROADCAST);
michael@0:         lbm.sendBroadcast(reloadIntent);
michael@0:     }
michael@0: 
michael@0:     private void registerReloadReceiver() {
michael@0:         final LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(mContext);
michael@0:         lbm.registerReceiver(mReloadBroadcastReceiver, new IntentFilter(RELOAD_BROADCAST));
michael@0:     }
michael@0: 
michael@0:     private void unregisterReloadReceiver() {
michael@0:         final LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(mContext);
michael@0:         lbm.unregisterReceiver(mReloadBroadcastReceiver);
michael@0:     }
michael@0: 
michael@0:     private class ReloadBroadcastReceiver extends BroadcastReceiver {
michael@0:         @Override
michael@0:         public void onReceive(Context context, Intent intent) {
michael@0:             mReloadListener.onReload();
michael@0:         }
michael@0:     }
michael@0: }