Fixed some errors

pages/index.html

@@ -11,7 +11,7 @@
     <script>
         $(document).ready(function () {
             var cmsgs = document.getElementById("channelmessages");
-            if (cmsgs.elements.length > 0)
+            if (cmsgs != null && cmsgs.childElementCount > 0)
                 cmsgs.lastElementChild.scrollIntoView(false);
         }); //TODO: Move to an index.js
     </script>

src/io/github/norbipeti/chat/server/data/DataManager.java

@@ -19,8 +19,10 @@ public final class DataManager {
 	public static <T extends SavedData> void save(T object) {
 		try {
 			File file = new File(object.getClass().getName() + "-" + object.getId());
-			while (file.exists())
+			while (file.exists()) {
 				object.setId(object.getId() + 1);
+				file = new File(object.getClass().getName() + "-" + object.getId());
+			}
 			Files.write(Main.gson.toJson(object), file, StandardCharsets.UTF_8);
 		} catch (IOException e) {
 			e.printStackTrace();

src/io/github/norbipeti/chat/server/page/ReceiveMessageAjaxPage.java

@@ -0,0 +1,88 @@
+package io.github.norbipeti.chat.server.page;
+
+import java.io.IOException;
+import java.util.Date;
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.LogManager;
+import com.google.gson.JsonObject;
+import com.sun.net.httpserver.HttpExchange;
+
+import io.github.norbipeti.chat.server.data.DataManager;
+import io.github.norbipeti.chat.server.data.LoaderCollection;
+import io.github.norbipeti.chat.server.db.domain.Conversation;
+import io.github.norbipeti.chat.server.db.domain.Message;
+import io.github.norbipeti.chat.server.db.domain.MessageChunk;
+import io.github.norbipeti.chat.server.db.domain.User;
+import io.github.norbipeti.chat.server.io.IOHelper;
+
+public class ReceiveMessageAjaxPage extends Page {
+
+	@Override
+	public String GetName() { //TODO
+		return "message"; //TODO: Update cookie every once in a while
+	}
+
+	@Override
+	public void handlePage(HttpExchange exchange) throws IOException {
+		User user = IOHelper.GetLoggedInUser(exchange);
+		if (user == null) {
+			IOHelper.SendResponse(403, "<p>Please log in to send messages</p>", exchange);
+			return; // TODO: Fix sending messages
+		}
+		JsonObject obj = IOHelper.GetPOSTJSON(exchange);
+		if (obj == null) {
+			/*
+			 * IOHelper.SendResponse(400,
+			 * "<h1>400 Bad request</h1><p>Not a JSON string!</p><p>" +
+			 * IOHelper.GetPOST(exchange) + "</p>", exchange);
+			 */
+			IOHelper.SendResponse(400, "JSONERROR", exchange);
+			return;
+		}
+		if (!obj.has("message") || !obj.has("conversation")) {
+			IOHelper.SendResponse(400,
+					"<h1>400 Bad request</h1><p>Message or conversation not found in JSON response.</p><p>"
+							+ IOHelper.GetPOST(exchange) + "</p>",
+					exchange);
+			return;
+		}
+		String message = obj.get("message").getAsString().trim();
+		int conversation = obj.get("conversation").getAsInt();
+		if (message.trim().length() == 0) {
+			IOHelper.SendResponse(400, "<h1>400 Bad request</h1><p>The message cannot be empty.</p>", exchange);
+			return;
+		}
+		LoaderCollection<Conversation> convos = user.getConversations();
+		Conversation conv = null;
+		LogManager.getLogger().log(Level.DEBUG, "Len: " + convos.size());
+		for (Conversation con : convos) {
+			LogManager.getLogger().log(Level.DEBUG, con.getId());
+			if (con.getId() == conversation) {
+				conv = con;
+				break;
+			}
+		}
+		if (conv == null) {
+			IOHelper.SendResponse(400, "<h1>400 Conversation not found</h1><p>The conversation with the id "
+					+ conversation + " is not found.</p>", exchange);
+			return;
+		}
+		MessageChunk chunk = new MessageChunk(); // TODO: Automatize
+		chunk.setConversation(conv);
+		Message msg = new Message();
+		msg.setSender(user);
+		msg.setMessage(message);
+		msg.setTime(new Date());
+		msg.setMessageChunk(chunk); // TODO: Store relations at one side or
+									// both);
+		chunk.getMessages().add(msg);
+		//DataManager.save(chunk); - TODO
+		conv.getMesssageChunks().add(chunk);
+		DataManager.save(conv);
+		LogManager.getLogger().log(Level.DEBUG,
+				"Added conversation's message count: " + conv.getMesssageChunks().size());
+
+		IOHelper.SendResponse(200, "Success", exchange);
+	}
+
+}