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 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-

  * This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 package org.mozilla.gecko.webapp;

 import java.util.ArrayList;

 import org.mozilla.gecko.GeckoAppShell;

 import android.content.Context;

 import android.content.SharedPreferences;

 import android.content.SharedPreferences.Editor;

 import android.util.Log;

 public class Allocator {

     private final String LOGTAG = "GeckoWebappAllocator";

     private static final String PREFIX_ORIGIN = "webapp-origin-";

     private static final String PREFIX_PACKAGE_NAME = "webapp-package-name-";

     // These prefixes are for prefs used by the old shortcut-based runtime.

     // We define them here so maybeMigrateOldPrefs can migrate them to their

     // new equivalents if this app was originally installed as a shortcut.

     // Maybe we can remove this code in the future!

     private static final String PREFIX_OLD_APP = "app";

     private static final String PREFIX_OLD_ICON = "icon";

     // The number of Webapp# and WEBAPP# activities/apps/intents

     private final static int MAX_WEB_APPS = 100;

     protected static Allocator sInstance = null;

     public static Allocator getInstance() {

         return getInstance(GeckoAppShell.getContext());

     }

     public static synchronized Allocator getInstance(Context cx) {

         if (sInstance == null) {

             sInstance = new Allocator(cx);

         }

         return sInstance;

     }

     SharedPreferences mPrefs;

     protected Allocator(Context context) {

         mPrefs = context.getSharedPreferences("webapps", Context.MODE_PRIVATE | Context.MODE_MULTI_PROCESS);

     }

     private static String appKey(int index) {

         return PREFIX_PACKAGE_NAME + index;

     }

     public static String iconKey(int index) {

         return "web-app-color-" + index;

     }

     public static String originKey(int i) {

         return PREFIX_ORIGIN + i;

     }

     private static String oldAppKey(int index) {

         return PREFIX_OLD_APP + index;

     }

     private static String oldIconKey(int index) {

         return PREFIX_OLD_ICON + index;

     }

     private static void save(Editor editor) {

         // Use SharedPreferences.Editor.apply() where available and commit()

         // where it isn't.  We could also use a background thread with commit(),

         // but our callers might expect the changes we make to be available

         // immediately, so we instead take the commit() performance hit

         // on the small percentage of extant devices that don't support apply().

         if (android.os.Build.VERSION.SDK_INT > 8) {

             editor.apply();

         } else {

             editor.commit();

         }

     }

     public ArrayList<String> getInstalledPackageNames() {

         ArrayList<String> installedPackages = new ArrayList<String>();

         for (int i = 0; i < MAX_WEB_APPS; ++i) {

             if (mPrefs.contains(appKey(i))) {

                 installedPackages.add(mPrefs.getString(appKey(i), ""));

             }

         }

         return installedPackages;

     }

     public synchronized int findOrAllocatePackage(final String packageName) {

         int index = getIndexForApp(packageName);

         if (index != -1)

             return index;

         for (int i = 0; i < MAX_WEB_APPS; ++i) {

             if (!mPrefs.contains(appKey(i))) {

                 // found unused index i

                 putPackageName(i, packageName);

                 return i;

             }

         }

         // no more apps!

         return -1;

     }

     public synchronized void putPackageName(final int index, final String packageName) {

         save(mPrefs.edit().putString(appKey(index), packageName));

     }

     public void updateColor(int index, int color) {

         save(mPrefs.edit().putInt(iconKey(index), color));

     }

     public synchronized int getIndexForApp(String packageName) {

         return findSlotForPrefix(PREFIX_PACKAGE_NAME, packageName);

     }

     public synchronized int getIndexForOrigin(String origin) {

         return findSlotForPrefix(PREFIX_ORIGIN, origin);

     }

     protected int findSlotForPrefix(String prefix, String value) {

         for (int i = 0; i < MAX_WEB_APPS; ++i) {

             if (mPrefs.getString(prefix + i, "").equals(value)) {

                 return i;

             }

         }

         return -1;

     }

     public synchronized String getAppForIndex(int index) {

         return mPrefs.getString(appKey(index), null);

     }

     public synchronized int releaseIndexForApp(String app) {

         int index = getIndexForApp(app);

         if (index == -1)

             return -1;

         releaseIndex(index);

         return index;

     }

     public synchronized void releaseIndex(final int index) {

         save(mPrefs.edit().remove(appKey(index)).remove(iconKey(index)).remove(originKey(index)));

     }

     public void putOrigin(int index, String origin) {

         save(mPrefs.edit().putString(originKey(index), origin));

     }

     public String getOrigin(int index) {

         return mPrefs.getString(originKey(index), null);

     }

     public int getColor(int index) {

         return mPrefs.getInt(iconKey(index), -1);

     }

     /**

      * Migrate old prefs to their new equivalents if this app was originally

      * installed by the shortcut-based implementation.

      */

     public void maybeMigrateOldPrefs(int index) {

         if (!mPrefs.contains(oldAppKey(index))) {

             return;

         }

         Log.i(LOGTAG, "migrating old prefs");

         // The old appKey pref stored the origin, while the new appKey pref

         // stores the packageName, so we migrate oldAppKey to the origin pref.

         putOrigin(index, mPrefs.getString(oldAppKey(index), null));

         // The old iconKey pref actually stored the splash screen background

         // color, so we migrate oldIconKey to the color pref.

         updateColor(index, mPrefs.getInt(oldIconKey(index), -1));

         // Remove the old prefs so we don't migrate them the next time around.

         save(mPrefs.edit().remove(oldAppKey(index)).remove(oldIconKey(index)));

     }

 }