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 * Institute of Molecular Cell Biology and Genetics, University of
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package org.scijava.main.console;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

import org.scijava.console.AbstractConsoleArgument;
import org.scijava.console.ConsoleArgument;
import org.scijava.log.LogService;
import org.scijava.main.MainService;
import org.scijava.plugin.Parameter;
import org.scijava.plugin.Plugin;

/**
 * Handles the {@code --main} command line argument, which launches an
 * alternative main class.
 * 
 * @author Curtis Rueden
 */
@Plugin(type = ConsoleArgument.class)
public class MainArgument extends AbstractConsoleArgument {

	@Parameter(required = false)
	private MainService mainService;

	@Parameter(required = false)
	private LogService log;

	// -- Constructor --

	public MainArgument() {
		super(2, "--main", "--main-class");
	}

	// -- ConsoleArgument methods --

	@Override
	public void handle(final LinkedList args) {
		if (!supports(args)) return;

		args.removeFirst(); // --main / --main-class
		final String className = args.removeFirst();

		final List argList = new ArrayList<>();
		while (!args.isEmpty() && !isFlag(args) && !isSeparator(args)) {
			argList.add(args.removeFirst());
		}
		if (isSeparator(args)) args.removeFirst(); // remove the -- separator
		final String[] mainArgs = argList.toArray(new String[argList.size()]);

		mainService.addMain(className, mainArgs);
	}

	// -- Typed methods --

	@Override
	public boolean supports(final LinkedList args) {
		return mainService != null && super.supports(args);
	}

	// -- Helper methods --

	private boolean isSeparator(final LinkedList args) {
		if (args == null || args.isEmpty()) return false;
		return args.getFirst().equals("--");
	}

}