// this class only parses messages it understands. if a message is not understood
// the origin and command are extracted and parsing halts.
class Parse {
	static Message message(String ircMessage) {
		Message message = new Message();
		int spIndex;
		
		if (ircMessage.startsWith(":")) {	
			spIndex = ircMessage.indexOf(' ');
			if (spIndex > -1) {
				message.origin = ircMessage.substring(1, spIndex);
				ircMessage = ircMessage.substring(spIndex + 1);
				
				int uIndex = message.origin.indexOf('!');
				if (uIndex > -1) {
					message.nickname = message.origin.substring(0, uIndex);
				}
			}
		}
		spIndex = ircMessage.indexOf(' ');
		if (spIndex == -1) {
			message.command = "null";
			return message;
		}
		
		message.command = ircMessage.substring(0, spIndex).toLowerCase();
		ircMessage = ircMessage.substring(spIndex + 1);
		
		// parse privmsg params
		if (message.command.equals("privmsg")) {
			spIndex = ircMessage.indexOf(' ');
			message.target = ircMessage.substring(0, spIndex);
			ircMessage = ircMessage.substring(spIndex + 1);
			
			if (ircMessage.startsWith(":")) {
				message.content = ircMessage.substring(1);
			}
			else {
				message.content = ircMessage;
			}
		}
		
		// parse quit/join
		if (message.command.equals("quit") || message.command.equals("join")) {
			if (ircMessage.startsWith(":")) {
				message.content = ircMessage.substring(1);
			}
			else {
				message.content = ircMessage;
			}
		}
		
		// parse ping params
		if (message.command.equals("ping")) {
			spIndex = ircMessage.indexOf(' ');
			if (spIndex > -1) {
				message.content = ircMessage.substring(0, spIndex);
			}
			else {
				message.content = ircMessage;
			}
		}
		return message;
	}
}