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package li.rudin.arduino.api.message;

import java.util.ArrayList;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MessageParser
{
	/**
	 * Local logger
	 */
	private static final Logger logger = LoggerFactory.getLogger(MessageParser.class);

	
	/**
	 * Parses a message from a byte array
	 * @param bytes
	 * @param length
	 * @return
	 */
	public static MessageParseResult parse(String msg)
	{
		byte[] bytes = msg.getBytes();
		return parse(bytes, bytes.length);
	}

	/**
	 * Parses a message from a byte array
	 * @param bytes
	 * @param length
	 * @return
	 */
	public static MessageParseResult parse(byte[] bytes, int length)
	{
		ArrayList list = new ArrayList<>();
		int cosumedBytes = 0;

		logger.debug("Parsing {} bytes", length);

		String str = new String(bytes, 0, length);

		if (!str.contains(Message.OUTER_DELIM))
			//No delims found, skip potential partial message
			return new MessageParseResult(list, 0);
		
		String[] parts = str.split("["+Message.OUTER_DELIM+"]");

		logger.debug("Got {} parts", parts.length);

		for (String part: parts)
		{	
			String[] keyValue = part.split("["+Message.INNER_DELIM+"]");

			if (keyValue.length > 2 || !part.contains(Message.INNER_DELIM))
			{
				logger.debug("invalid delimiters in part: '{}' message: '{}'", part, str);
				continue;
			}

			Message message = null;
			if (keyValue.length == 2)
				message = new Message(keyValue[0], keyValue[1]);
			else if (keyValue.length == 1)
				message = new Message(keyValue[0], "");

			logger.debug("Got message: {}", message);
			
			cosumedBytes += part.length() + Message.OUTER_DELIM.length();

			list.add(message);
		}


		return new MessageParseResult(list, cosumedBytes);
	}


}