Gutenberg progressive rollout

WordPress/src/main/java/org/wordpress/android/WordPress.java

@@ -895,7 +895,7 @@ public void onAppComesFromBackground() {
             }
 
             // Let's migrate the old editor preference if available in AppPrefs to the remote backend
-            SiteUtils.migrateAppWideMobileEditorPreferenceToRemote(mContext, mDispatcher);
+            SiteUtils.migrateAppWideMobileEditorPreferenceToRemote(mAccountStore, mSiteStore, mDispatcher);
 
             if (mFirstActivityResumed) {
                 deferredInit();

WordPress/src/main/java/org/wordpress/android/ui/prefs/AppPrefs.java

@@ -115,6 +115,7 @@ public enum DeletablePrefKey implements PrefKey {
         NEWS_CARD_SHOWN_VERSION,
         AVATAR_VERSION,
         GUTENBERG_DEFAULT_FOR_NEW_POSTS,
+        USER_IN_GUTENBERG_ROLLOUT_GROUP,
         SHOULD_AUTO_ENABLE_GUTENBERG_FOR_THE_NEW_POSTS,
         GUTENBERG_OPT_IN_DIALOG_SHOWN,
 
@@ -607,6 +608,14 @@ public static boolean isDefaultAppWideEditorPreferenceSet() {
         return !"".equals(getString(DeletablePrefKey.GUTENBERG_DEFAULT_FOR_NEW_POSTS));
     }
 
+    public static boolean isUserInGutenbergRolloutGroup() {
+        return getBoolean(DeletablePrefKey.GUTENBERG_DEFAULT_FOR_NEW_POSTS, false);
+    }
+
+    public static void setUserInGutenbergRolloutGroup() {
+        setBoolean(DeletablePrefKey.GUTENBERG_DEFAULT_FOR_NEW_POSTS, true);
+    }
+
     public static void removeAppWideEditorPreference() {
         remove(DeletablePrefKey.GUTENBERG_DEFAULT_FOR_NEW_POSTS);
     }

WordPress/src/main/java/org/wordpress/android/util/SiteUtils.java

@@ -1,6 +1,5 @@
 package org.wordpress.android.util;
 
-import android.content.Context;
 import android.text.TextUtils;
 
 import androidx.annotation.NonNull;
@@ -10,6 +9,7 @@
 import org.wordpress.android.fluxc.Dispatcher;
 import org.wordpress.android.fluxc.generated.SiteActionBuilder;
 import org.wordpress.android.fluxc.model.SiteModel;
+import org.wordpress.android.fluxc.store.AccountStore;
 import org.wordpress.android.fluxc.store.SiteStore;
 import org.wordpress.android.fluxc.store.SiteStore.DesignateMobileEditorForAllSitesPayload;
 import org.wordpress.android.fluxc.store.SiteStore.DesignateMobileEditorPayload;
@@ -25,6 +25,7 @@
 public class SiteUtils {
     public static final String GB_EDITOR_NAME = "gutenberg";
     public static final String AZTEC_EDITOR_NAME = "aztec";
+    private static final int GB_ROLLOUT_PERCENTAGE = 5;
 
     /**
      * Migrate the old app-wide editor preference value to per-site setting. wpcom sites will make a network call
@@ -35,8 +36,43 @@ public class SiteUtils {
      * -- 12.9 OPTED OUT (were auto-opted in but turned it OFF) -> turn all sites OFF in 13.0
      *
      */
-    public static void migrateAppWideMobileEditorPreferenceToRemote(final Context context,
+    public static void migrateAppWideMobileEditorPreferenceToRemote(final AccountStore accountStore,
+                                                                    final SiteStore siteStore,
                                                                     final Dispatcher dispatcher) {
+        // In a later version we might override mobile_editor setting if it's set to `aztec` and show a specific notice
+        // for these users ("We made a lot of progress on the block editor and we think it's now better than
+        // the classic editor, we switched it on, but you can change the configuration in your Site Settings").
+        // ^ This code should be here.
+
+        // If the user is already in the rollout group, we can skip this the migration.
+        if (AppPrefs.isUserInGutenbergRolloutGroup()) {
+            return;
+        }
+
+        // Check if the user has been "randomly" selected to enter the rollout group.
+        //
+        // For self hosted sites, there are often one or two users, and the user id is probably 0, 1 in these cases.
+        // If we exclude low ids, we won't get an not an homogeneous distribution over self hosted and WordPress.com users,
+        // but the purpose of this is to do a progressive rollout, not an necessarily an homogeneous rollout.
+        //
+        // To exclude ids 0 and 1, to rollout for 10% users, we'll use a test like `id % 100 >= 90` instead of `id % 100 < 10`.
+        if (accountStore.getAccount().getUserId() % 100 >= (100 - GB_ROLLOUT_PERCENTAGE)) {
+            // We want to make sure to enable Gutenberg only on the sites they didn't opt-out.
+            for (SiteModel site : siteStore.getSites()) {
+                if (TextUtils.isEmpty(site.getMobileEditor())) {
+                    // Enable Gutenberg
+                    enableBlockEditor(dispatcher, site);
+                    AnalyticsUtils.trackWithSiteDetails(Stat.EDITOR_GUTENBERG_ENABLED, site,
+                            BlockEditorEnabledSource.ON_PROGRESSIVE_ROLLOUT.asPropertyMap());
+                    // Show the info popup when the user creates a new post for the first time on this site
+                    AppPrefs.setShowGutenbergInfoPopupForTheNewPosts(site.getUrl(), true);
+                }
+            }
+
+            // After enabling Gutenberg on these sites, we consider the user entered the rollout group
+            AppPrefs.setUserInGutenbergRolloutGroup();
+        }
+
         if (!AppPrefs.isDefaultAppWideEditorPreferenceSet()) {
             return;
         }

WordPress/src/main/java/org/wordpress/android/util/analytics/AnalyticsUtils.java

@@ -73,7 +73,8 @@ public class AnalyticsUtils {
     public enum BlockEditorEnabledSource {
         VIA_SITE_SETTINGS,
         ON_SITE_CREATION,
-        ON_BLOCK_POST_OPENING;
+        ON_BLOCK_POST_OPENING,
+        ON_PROGRESSIVE_ROLLOUT;
 
         public Map<String, Object> asPropertyMap() {
             Map<String, Object> properties = new HashMap<>();