Add better error message for Facebook connection

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

@@ -3,6 +3,8 @@
 import org.wordpress.android.util.StringUtils;
 
 public class PublicizeService {
+    public static final String FACEBOOK_SERVICE_ID = "facebook";
+
     private String mId;
     private String mLabel;
     private String mDescription;

WordPress/src/main/java/org/wordpress/android/ui/publicize/PublicizeActions.java

@@ -11,6 +11,7 @@
 import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
+import org.wordpress.android.R;
 import org.wordpress.android.WordPress;
 import org.wordpress.android.datasets.PublicizeTable;
 import org.wordpress.android.models.PublicizeConnection;
@@ -36,6 +37,14 @@ public interface OnPublicizeActionListener {
         void onRequestReconnect(PublicizeService service, PublicizeConnection connection);
     }
 
+    private static class PublicizeConnectionValidationException extends Exception {
+        private final int mReasonResId;
+
+        PublicizeConnectionValidationException(int reasonResId) {
+            mReasonResId = reasonResId;
+        }
+    }
+
     /*
      * disconnect a currently connected publicize service
      */
@@ -114,7 +123,17 @@ private static void connectStepOne(final long siteId, final String serviceId, fi
         RestRequest.Listener listener = new RestRequest.Listener() {
             @Override
             public void onResponse(JSONObject jsonObject) {
-                if (shouldShowChooserDialog(siteId, serviceId, jsonObject)) {
+                final boolean showChooserDialog;
+                try {
+                    showChooserDialog = shouldShowChooserDialog(siteId, serviceId, jsonObject);
+                } catch (PublicizeConnectionValidationException e) {
+                    final ActionCompleted event =
+                            new ActionCompleted(false, ConnectAction.CONNECT, serviceId, e.mReasonResId);
+                    EventBus.getDefault().post(event);
+                    return;
+                }
+
+                if (showChooserDialog) {
                     // show dialog showing multiple options
                     EventBus.getDefault()
                             .post(new PublicizeEvents.ActionRequestChooseAccount(siteId, serviceId, jsonObject));
@@ -169,10 +188,11 @@ public void onErrorResponse(VolleyError volleyError) {
         WordPress.getRestClientUtilsV1_1().post(path, params, null, listener, errorListener);
     }
 
-    private static boolean shouldShowChooserDialog(long siteId, String serviceId, JSONObject jsonObject) {
+    private static boolean shouldShowChooserDialog(long siteId, String serviceId, JSONObject jsonObject)
+            throws PublicizeConnectionValidationException {
         JSONArray jsonConnectionList = jsonObject.optJSONArray("connections");
 
-        if (jsonConnectionList == null || jsonConnectionList.length() <= 1) {
+        if (jsonConnectionList == null || jsonConnectionList.length() <= 0) {
             return false;
         }
 
@@ -191,10 +211,15 @@ private static boolean shouldShowChooserDialog(long siteId, String serviceId, JS
                 }
             }
 
+            final boolean hasExternalAccounts = totalExternalAccounts > 0;
             if (PublicizeTable.onlyExternalConnections(serviceId)) {
-                return totalExternalAccounts > 0;
+                if (!hasExternalAccounts && serviceId.equals(PublicizeService.FACEBOOK_SERVICE_ID)) {
+                    throw new PublicizeConnectionValidationException(R.string.sharing_facebook_account_must_have_pages);
+                } else {
+                    return hasExternalAccounts;
+                }
             } else {
-                return totalAccounts > 0 || totalExternalAccounts > 0;
+                return totalAccounts > 0 || hasExternalAccounts;
             }
         } catch (JSONException e) {
             return false;

WordPress/src/main/java/org/wordpress/android/ui/publicize/PublicizeEvents.java

@@ -1,8 +1,13 @@
 package org.wordpress.android.ui.publicize;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
 import org.json.JSONObject;
 import org.wordpress.android.ui.publicize.PublicizeConstants.ConnectAction;
 
+import java.net.URL;
+
 /**
  * Publicize-related EventBus event classes
  */
@@ -17,12 +22,21 @@ public static class ConnectionsChanged {
     public static class ActionCompleted {
         private final boolean mSucceeded;
         private final ConnectAction mAction;
+        /**
+         * The reason for why {@link #mSucceeded} is false.
+         */
+        @Nullable private final Integer mReasonResId;
         private String mService;
 
         public ActionCompleted(boolean succeeded, ConnectAction action, String service) {
+            this(succeeded, action, service, null);
+        }
+
+        ActionCompleted(boolean succeeded, ConnectAction action, String service, @Nullable Integer reasonResId) {
             mSucceeded = succeeded;
             mAction = action;
             mService = service;
+            mReasonResId = reasonResId;
         }
 
         public ConnectAction getAction() {
@@ -36,6 +50,10 @@ public boolean didSucceed() {
         public String getService() {
             return mService;
         }
+
+        @Nullable public Integer getReasonResId() {
+            return mReasonResId;
+        }
     }
 
     public static class ActionAccountChosen {

WordPress/src/main/java/org/wordpress/android/ui/publicize/PublicizeListActivity.java

@@ -322,7 +322,11 @@ public void onEventMainThread(PublicizeEvents.ActionCompleted event) {
                 AnalyticsUtils.trackWithSiteDetails(Stat.PUBLICIZE_SERVICE_DISCONNECTED, mSite, analyticsProperties);
             }
         } else {
-            ToastUtils.showToast(this, R.string.error_generic);
+            if (event.getReasonResId() != null) {
+                showAlertForFailureReason(event.getReasonResId());
+            } else {
+                ToastUtils.showToast(this, R.string.error_generic);
+            }
         }
     }
 
@@ -372,4 +376,12 @@ public void onButtonPrefsClicked() {
                             .setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE)
                             .commit();
     }
+
+    private void showAlertForFailureReason(int reasonResId) {
+        final AlertDialog.Builder builder =
+                new AlertDialog.Builder(new ContextThemeWrapper(this, R.style.Calypso_Dialog));
+        builder.setMessage(reasonResId);
+        builder.setPositiveButton(R.string.ok, (dialog, which) -> dialog.dismiss());
+        builder.show();
+    }
 }

WordPress/src/main/res/values/strings.xml

@@ -110,6 +110,7 @@
     <string name="write_post">Write Post</string>
     <string name="dismiss">dismiss</string>
     <string name="exit">exit</string>
+    <string name="ok">OK</string>
 
     <string name="button_not_now">Not now</string>
 
@@ -1903,6 +1904,7 @@
     <string name="connecting_account">Connecting account</string>
     <string name="sharing_label_message">Change the text of the sharing buttons\' label. This text won\'t appear until you add at least one sharing button.</string>
     <string name="sharing_twitter_message">This will be included in tweets when people share using the Twitter button</string>
+    <string name="sharing_facebook_account_must_have_pages">The Facebook connection could not be made because this account does not have access to any pages. Facebook supports sharing connections to Facebook Pages, but not to Facebook Profiles.</string>
 
     <!--Theme Browser-->
     <string name="current_theme">Current Theme</string>