package com.jotuntech.sketcher.client.command;

import java.nio.ByteBuffer;

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

public class SetLayerCommand implements Command {
	Integer layerKey;

	public SetLayerCommand() {
	}

	public SetLayerCommand(Integer layerKey) {
		this.layerKey = layerKey;
	}

	public int perform(Client client, User user) {
		if(user == null) {
			return Connection.SEND_NONE;
		}

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

		Canvas canvas = client.getCanvas();

		if(canvas == null) {
			return Connection.SEND_NONE;
		}

		Layer layer = canvas.getLayerMap().get(layerKey);

		if(layer == null) {
			return Connection.SEND_NONE;
		}

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

		user.setLayer(layer);

		if(user == client.getConnection().getUser()) {
			client.getUserInterface().updateLayer();
		}

		return Connection.SEND_OTHERS;
	}


	public void decode(ByteBuffer in) {
		layerKey = in.getInt();
	}

	public void encode(ByteBuffer out) {
		out.putInt(layerKey);
	}
}