Sync last seen notification ID with server

mastodon/src/main/java/org/joinmastodon/android/api/JsonObjectRequestBody.java

@@ -1,5 +1,6 @@
 package org.joinmastodon.android.api;
 
+import com.google.gson.JsonElement;
 import com.google.gson.JsonIOException;
 
 import java.io.IOException;
@@ -26,7 +27,10 @@ public class JsonObjectRequestBody extends RequestBody{
 	public void writeTo(BufferedSink sink) throws IOException{
 		try{
 			OutputStreamWriter writer=new OutputStreamWriter(sink.outputStream(), StandardCharsets.UTF_8);
-			MastodonAPIController.gson.toJson(obj, writer);
+			if(obj instanceof JsonElement)
+				writer.write(obj.toString());
+			else
+				MastodonAPIController.gson.toJson(obj, writer);
 			writer.flush();
 		}catch(JsonIOException x){
 			throw new IOException(x);

mastodon/src/main/java/org/joinmastodon/android/api/gson/JsonArrayBuilder.java

@@ -0,0 +1,42 @@
+package org.joinmastodon.android.api.gson;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+
+public class JsonArrayBuilder{
+	private JsonArray arr=new JsonArray();
+
+	public JsonArrayBuilder add(JsonElement el){
+		arr.add(el);
+		return this;
+	}
+
+	public JsonArrayBuilder add(String el){
+		arr.add(el);
+		return this;
+	}
+
+	public JsonArrayBuilder add(Number el){
+		arr.add(el);
+		return this;
+	}
+
+	public JsonArrayBuilder add(boolean el){
+		arr.add(el);
+		return this;
+	}
+
+	public JsonArrayBuilder add(JsonObjectBuilder el){
+		arr.add(el.build());
+		return this;
+	}
+
+	public JsonArrayBuilder add(JsonArrayBuilder el){
+		arr.add(el.build());
+		return this;
+	}
+
+	public JsonArray build(){
+		return arr;
+	}
+}

mastodon/src/main/java/org/joinmastodon/android/api/gson/JsonObjectBuilder.java

@@ -0,0 +1,42 @@
+package org.joinmastodon.android.api.gson;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+
+public class JsonObjectBuilder{
+	private JsonObject obj=new JsonObject();
+
+	public JsonObjectBuilder add(String key, JsonElement el){
+		obj.add(key, el);
+		return this;
+	}
+
+	public JsonObjectBuilder add(String key, String el){
+		obj.addProperty(key, el);
+		return this;
+	}
+
+	public JsonObjectBuilder add(String key, Number el){
+		obj.addProperty(key, el);
+		return this;
+	}
+
+	public JsonObjectBuilder add(String key, boolean el){
+		obj.addProperty(key, el);
+		return this;
+	}
+
+	public JsonObjectBuilder add(String key, JsonObjectBuilder el){
+		obj.add(key, el.build());
+		return this;
+	}
+
+	public JsonObjectBuilder add(String key, JsonArrayBuilder el){
+		obj.add(key, el.build());
+		return this;
+	}
+
+	public JsonObject build(){
+		return obj;
+	}
+}

mastodon/src/main/java/org/joinmastodon/android/api/requests/markers/SaveMarkers.java

@@ -0,0 +1,21 @@
+package org.joinmastodon.android.api.requests.markers;
+
+import org.joinmastodon.android.api.MastodonAPIRequest;
+import org.joinmastodon.android.api.gson.JsonObjectBuilder;
+import org.joinmastodon.android.model.Marker;
+
+public class SaveMarkers extends MastodonAPIRequest<SaveMarkers.Response>{
+	public SaveMarkers(String lastSeenHomePostID, String lastSeenNotificationID){
+		super(HttpMethod.POST, "/markers", Response.class);
+		JsonObjectBuilder builder=new JsonObjectBuilder();
+		if(lastSeenHomePostID!=null)
+			builder.add("home", new JsonObjectBuilder().add("last_read_id", lastSeenHomePostID));
+		if(lastSeenNotificationID!=null)
+			builder.add("notifications", new JsonObjectBuilder().add("last_read_id", lastSeenNotificationID));
+		setRequestBody(builder.build());
+	}
+
+	public static class Response{
+		public Marker home, notifications;
+	}
+}

mastodon/src/main/java/org/joinmastodon/android/fragments/NotificationsListFragment.java

@@ -8,6 +8,7 @@ import com.squareup.otto.Subscribe;
 
 import org.joinmastodon.android.E;
 import org.joinmastodon.android.R;
+import org.joinmastodon.android.api.requests.markers.SaveMarkers;
 import org.joinmastodon.android.api.session.AccountSessionManager;
 import org.joinmastodon.android.events.PollUpdatedEvent;
 import org.joinmastodon.android.events.RemoveAccountPostsEvent;
@@ -113,6 +114,10 @@ public class NotificationsListFragment extends BaseStatusListFragment<Notificati
 								.collect(Collectors.toSet());
 						loadRelationships(needRelationships);
 						maxID=result.maxID;
+
+						if(offset==0 && !result.items.isEmpty()){
+							new SaveMarkers(null, result.items.get(0).id).exec(accountID);
+						}
 					}
 				});
 	}

mastodon/src/main/java/org/joinmastodon/android/model/Marker.java

@@ -0,0 +1,21 @@
+package org.joinmastodon.android.model;
+
+import org.joinmastodon.android.api.AllFieldsAreRequired;
+
+import java.time.Instant;
+
+@AllFieldsAreRequired
+public class Marker extends BaseModel{
+	public String lastReadId;
+	public long version;
+	public Instant updatedAt;
+
+	@Override
+	public String toString(){
+		return "Marker{"+
+				"lastReadId='"+lastReadId+'\''+
+				", version="+version+
+				", updatedAt="+updatedAt+
+				'}';
+	}
+}