package com.jotuntech.sketcher.server.command;

import java.nio.ByteBuffer;
import java.util.Deque;

import com.jotuntech.sketcher.common.UndoEntry;
import com.jotuntech.sketcher.common.User;
import com.jotuntech.sketcher.server.Command;
import com.jotuntech.sketcher.server.Connection;
import com.jotuntech.sketcher.server.Server;

public class MergeCommand implements Command {

	public int perform(Server server, Connection connection) {
		User user = connection.getUser();

		if(user == null || user.getLayer() == null) {
			return Connection.SEND_NONE;
		}

		if(user.isViewer()) {
			return Connection.SEND_NONE;
		}

		if(user.getPhantomLayer().isEmpty()) {
			return Connection.SEND_NONE;
		}
		
		UndoEntry undoEntry = new UndoEntry();
		undoEntry.setLayer(user.getLayer());
		undoEntry.setUndoData(user.getLayer().merge(user.getPhantomLayer()));
		Deque<UndoEntry> undoDeque = user.getUndoDeque();
		undoDeque.addFirst(undoEntry);
		while(undoDeque.size() > 10) {
			undoDeque.removeLast();
		}
		
		server.setMergeDirty(null);

		return Connection.SEND_OTHERS;
	}

	public void decode(ByteBuffer in) {

	}

	public void encode(ByteBuffer out) {

	}
}