package mc.cliparser;

import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;

public class CommandLineParser {

	private final Set<Option> options = new HashSet<>();

	public void addOption(Option option) {
		options.add(option);
	}

	public CommandLine parse(String[] args) {

		Set<Option> foundOptions = new HashSet<>();
		AtomicReference<Option> refCurrentOption = new AtomicReference<>(null);

		for (String arg : args) {
			if (refCurrentOption.get() != null) {
				refCurrentOption.get().value(arg);
				foundOptions.add(refCurrentOption.get());
				refCurrentOption.set(null);
			} else {
				parseOptArgs(arg, foundOptions, refCurrentOption);
			}
		}

		return new CommandLine(foundOptions);
	}

	@SuppressWarnings("java:S125")
	private void parseOptArgs(String arg, Set<Option> foundOptions, AtomicReference<Option> refCurrentOption) {
		String optName;
		if (arg.startsWith("--")) {
			optName = arg.substring(2);
		} else /*if (args[i].startsWith("-"))*/ {
			optName = arg.substring(1);
		}

		for (Option option : options) {
			if (optName.equals(option.shortName()) || optName.equals(option.longName())) {
				if (option.hasArgs()) {
					refCurrentOption.set(option);
				} else {
					foundOptions.add(option);
				}
			}
		}
	}
}