package com.jotuntech.sketcher.client.command;

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

import com.jotuntech.sketcher.client.Client;
import com.jotuntech.sketcher.client.Command;
import com.jotuntech.sketcher.client.Connection;
import com.jotuntech.sketcher.common.UndoEntry;
import com.jotuntech.sketcher.common.User;

public class MergeCommand implements Command {
	public int perform(Client client, User user) {
		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();
		}

		return Connection.SEND_OTHERS;
	}

	public void decode(ByteBuffer in) {

	}

	public void encode(ByteBuffer out) {

	}
}