package com.jotuntech.sketcher.server.command;

import java.nio.ByteBuffer;

import com.jotuntech.sketcher.common.BitmapLayer;
import com.jotuntech.sketcher.common.Layer;
import com.jotuntech.sketcher.common.User;
import com.jotuntech.sketcher.server.AccessController;
import com.jotuntech.sketcher.server.Command;
import com.jotuntech.sketcher.server.CommandEntry;
import com.jotuntech.sketcher.server.Connection;
import com.jotuntech.sketcher.server.Server;

public class CreateLayerCommand implements Command {
	int layerKey;
	int type;
	String name;

	public CreateLayerCommand() {

	}

	public CreateLayerCommand(int layerKey, int type, String name) {
		this.layerKey = layerKey;
		this.type = type;
		this.name = name;
	}

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

		if(user == null) {
			/** Connections with users only */
			return Connection.SEND_NONE;
		}

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

		/** Check access controller */
		AccessController controller = server.getAccessController();
		if(controller != null) {
			if(!controller.isLayerActionAllowed(server, user)) {
				connection.getSendQueue().offer(new CommandEntry(0, new ServerMessageCommand("You are not allowed to do that.")));
				return Connection.SEND_NONE;
			}
		}

		Layer l = new BitmapLayer(name);
		layerKey = server.getCanvas().getLayerMap().put(l);

		return Connection.SEND_ALL;
	}

	public void decode(ByteBuffer in) {
		layerKey = in.getInt();
		type = in.get();
		StringBuffer nameBuffer = new StringBuffer();
		while(in.remaining() >= 2) {
			nameBuffer.append(in.getChar());
		}
		name = nameBuffer.toString();
	}

	public void encode(ByteBuffer out) {
		out.putInt(layerKey);
		out.put((byte) type);
		for(int i = 0; i < name.length(); i++) {
			out.putChar(name.charAt(i));
		}
	}

}